update version

using NSMutableArray sortUsingFunction instead of NSArray sortedArray…

FrameWork/Info.plist

@@ -15,7 +15,7 @@
 	<key>CFBundlePackageType</key>
 	<string>FMWK</string>
 	<key>CFBundleShortVersionString</key>
-	<string>2.4.2</string>
+	<string>2.6</string>
 	<key>CFBundleSignature</key>
 	<string>????</string>
 	<key>CFBundleVersion</key>

FrameWork/LFLiveKit.xcodeproj/xcshareddata/xcschemes/LFLiveKitFramework-universal.xcscheme

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <Scheme
-   LastUpgradeVersion = "0730"
+   LastUpgradeVersion = "0800"
    version = "1.3">
    <BuildAction
       parallelizeBuildables = "YES"
@@ -14,10 +14,10 @@
             buildForAnalyzing = "YES">
             <BuildableReference
                BuildableIdentifier = "primary"
-               BlueprintIdentifier = "84D8B4251D75778B00752B56"
-               BuildableName = "LFLiveKitDemo.app"
-               BlueprintName = "LFLiveKitDemo"
-               ReferencedContainer = "container:LFLiveKitDemo.xcodeproj">
+               BlueprintIdentifier = "84D003751DB8FE1000560583"
+               BuildableName = "LFLiveKitFramework-universal"
+               BlueprintName = "LFLiveKitFramework-universal"
+               ReferencedContainer = "container:LFLiveKit.xcodeproj">
             </BuildableReference>
          </BuildActionEntry>
       </BuildActionEntries>
@@ -29,15 +29,6 @@
       shouldUseLaunchSchemeArgsEnv = "YES">
       <Testables>
       </Testables>
-      <MacroExpansion>
-         <BuildableReference
-            BuildableIdentifier = "primary"
-            BlueprintIdentifier = "84D8B4251D75778B00752B56"
-            BuildableName = "LFLiveKitDemo.app"
-            BlueprintName = "LFLiveKitDemo"
-            ReferencedContainer = "container:LFLiveKitDemo.xcodeproj">
-         </BuildableReference>
-      </MacroExpansion>
       <AdditionalOptions>
       </AdditionalOptions>
    </TestAction>
@@ -51,16 +42,15 @@
       debugDocumentVersioning = "YES"
       debugServiceExtension = "internal"
       allowLocationSimulation = "YES">
-      <BuildableProductRunnable
-         runnableDebuggingMode = "0">
+      <MacroExpansion>
          <BuildableReference
             BuildableIdentifier = "primary"
-            BlueprintIdentifier = "84D8B4251D75778B00752B56"
-            BuildableName = "LFLiveKitDemo.app"
-            BlueprintName = "LFLiveKitDemo"
-            ReferencedContainer = "container:LFLiveKitDemo.xcodeproj">
+            BlueprintIdentifier = "84D003751DB8FE1000560583"
+            BuildableName = "LFLiveKitFramework-universal"
+            BlueprintName = "LFLiveKitFramework-universal"
+            ReferencedContainer = "container:LFLiveKit.xcodeproj">
          </BuildableReference>
-      </BuildableProductRunnable>
+      </MacroExpansion>
       <AdditionalOptions>
       </AdditionalOptions>
    </LaunchAction>
@@ -70,16 +60,15 @@
       savedToolIdentifier = ""
       useCustomWorkingDirectory = "NO"
       debugDocumentVersioning = "YES">
-      <BuildableProductRunnable
-         runnableDebuggingMode = "0">
+      <MacroExpansion>
          <BuildableReference
             BuildableIdentifier = "primary"
-            BlueprintIdentifier = "84D8B4251D75778B00752B56"
-            BuildableName = "LFLiveKitDemo.app"
-            BlueprintName = "LFLiveKitDemo"
-            ReferencedContainer = "container:LFLiveKitDemo.xcodeproj">
+            BlueprintIdentifier = "84D003751DB8FE1000560583"
+            BuildableName = "LFLiveKitFramework-universal"
+            BlueprintName = "LFLiveKitFramework-universal"
+            ReferencedContainer = "container:LFLiveKit.xcodeproj">
          </BuildableReference>
-      </BuildableProductRunnable>
+      </MacroExpansion>
    </ProfileAction>
    <AnalyzeAction
       buildConfiguration = "Debug">

FrameWork/LFLiveKit.xcodeproj/xcshareddata/xcschemes/LFLiveKitFramework.xcscheme

@@ -0,0 +1,80 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<Scheme
+   LastUpgradeVersion = "0800"
+   version = "1.3">
+   <BuildAction
+      parallelizeBuildables = "YES"
+      buildImplicitDependencies = "YES">
+      <BuildActionEntries>
+         <BuildActionEntry
+            buildForTesting = "YES"
+            buildForRunning = "YES"
+            buildForProfiling = "YES"
+            buildForArchiving = "YES"
+            buildForAnalyzing = "YES">
+            <BuildableReference
+               BuildableIdentifier = "primary"
+               BlueprintIdentifier = "8495F66A1DB8F14600542124"
+               BuildableName = "LFLiveKit.framework"
+               BlueprintName = "LFLiveKitFramework"
+               ReferencedContainer = "container:LFLiveKit.xcodeproj">
+            </BuildableReference>
+         </BuildActionEntry>
+      </BuildActionEntries>
+   </BuildAction>
+   <TestAction
+      buildConfiguration = "Debug"
+      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
+      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
+      shouldUseLaunchSchemeArgsEnv = "YES">
+      <Testables>
+      </Testables>
+      <AdditionalOptions>
+      </AdditionalOptions>
+   </TestAction>
+   <LaunchAction
+      buildConfiguration = "Debug"
+      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
+      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
+      launchStyle = "0"
+      useCustomWorkingDirectory = "NO"
+      ignoresPersistentStateOnLaunch = "NO"
+      debugDocumentVersioning = "YES"
+      debugServiceExtension = "internal"
+      allowLocationSimulation = "YES">
+      <MacroExpansion>
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "8495F66A1DB8F14600542124"
+            BuildableName = "LFLiveKit.framework"
+            BlueprintName = "LFLiveKitFramework"
+            ReferencedContainer = "container:LFLiveKit.xcodeproj">
+         </BuildableReference>
+      </MacroExpansion>
+      <AdditionalOptions>
+      </AdditionalOptions>
+   </LaunchAction>
+   <ProfileAction
+      buildConfiguration = "Release"
+      shouldUseLaunchSchemeArgsEnv = "YES"
+      savedToolIdentifier = ""
+      useCustomWorkingDirectory = "NO"
+      debugDocumentVersioning = "YES">
+      <MacroExpansion>
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "8495F66A1DB8F14600542124"
+            BuildableName = "LFLiveKit.framework"
+            BlueprintName = "LFLiveKitFramework"
+            ReferencedContainer = "container:LFLiveKit.xcodeproj">
+         </BuildableReference>
+      </MacroExpansion>
+   </ProfileAction>
+   <AnalyzeAction
+      buildConfiguration = "Debug">
+   </AnalyzeAction>
+   <ArchiveAction
+      buildConfiguration = "Release"
+      revealArchiveInOrganizer = "YES">
+   </ArchiveAction>
+</Scheme>

FrameWork/LFLiveKitFramework/Info.plist

@@ -0,0 +1,24 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>CFBundleDevelopmentRegion</key>
+	<string>en</string>
+	<key>CFBundleExecutable</key>
+	<string>$(EXECUTABLE_NAME)</string>
+	<key>CFBundleIdentifier</key>
+	<string>$(PRODUCT_BUNDLE_IDENTIFIER)</string>
+	<key>CFBundleInfoDictionaryVersion</key>
+	<string>6.0</string>
+	<key>CFBundleName</key>
+	<string>$(PRODUCT_NAME)</string>
+	<key>CFBundlePackageType</key>
+	<string>FMWK</string>
+	<key>CFBundleShortVersionString</key>
+	<string>2.4.3</string>
+	<key>CFBundleVersion</key>
+	<string>$(CURRENT_PROJECT_VERSION)</string>
+	<key>NSPrincipalClass</key>
+	<string></string>
+</dict>
+</plist>

FrameWork/LFLiveKitFramework/LFLiveKitFramework.h

@@ -0,0 +1,26 @@
+//
+//  LFLiveKitFramework.h
+//  LFLiveKitFramework
+//
+//  Created by admin on 2016/10/20.
+//  Copyright © 2016年 admin. All rights reserved.
+//
+
+#import <UIKit/UIKit.h>
+
+//! Project version number for LFLiveKitFramework.
+FOUNDATION_EXPORT double LFLiveKitFrameworkVersionNumber;
+
+//! Project version string for LFLiveKitFramework.
+FOUNDATION_EXPORT const unsigned char LFLiveKitFrameworkVersionString[];
+
+// In this header, you should import all the public headers of your framework using statements like #import <LFLiveKitFramework/PublicHeader.h>
+
+#import <LFLiveKit/LFLiveSession.h>
+#import <LFLiveKit/LFLiveAudioConfiguration.h>
+#import <LFLiveKit/LFLiveVideoConfiguration.h>
+#import <LFLiveKit/LFAudioFrame.h>
+#import <LFLiveKit/LFFrame.h>
+#import <LFLiveKit/LFLiveStreamInfo.h>
+#import <LFLiveKit/LFVideoFrame.h>
+#import <LFLiveKit/LFLiveDebug.h>

FrameWork/Podfile

@@ -1,7 +0,0 @@
-source 'https://github.com/CocoaPods/Specs.git'
-platform :ios,'7.0'
-
-target “LFLiveKit” do
-    pod 'pili-librtmp', '~> 1.0.3.1'
-    pod 'LMGPUImage'
-end

LFLiveKit.podspec

@@ -2,7 +2,7 @@
 Pod::Spec.new do |s|
 
   s.name         = "LFLiveKit"
-  s.version      = "2.4.2"
+  s.version      = "2.6"
   s.summary      = "LaiFeng ios Live. LFLiveKit."
   s.homepage     = "https://github.com/chenliming777"
   s.license      = { :type => "MIT", :file => "LICENSE" }
@@ -17,6 +17,4 @@ Pod::Spec.new do |s|
   s.libraries = "c++", "z"
 
   s.requires_arc = true
-  s.dependency 'LMGPUImage'
-  s.dependency 'pili-librtmp', '1.0.3.1'
 end

LFLiveKit/LFLiveKit.h

@@ -6,16 +6,9 @@
 //  Copyright © 2016年 LaiFeng All rights reserved.
 //
 
-#if __has_include(<LFLiveKit/LFLiveKit.h>)
-#import <LFLiveKit/LFLiveSession.h>
-#import <LFLiveKit/LFLiveAudioConfiguration.h>
-#import <LFLiveKit/LFLiveVideoConfiguration.h>
-#import <LFLiveKit/LFAudioFrame.h>
-#import <LFLiveKit/LFFrame.h>
-#import <LFLiveKit/LFLiveStreamInfo.h>
-#import <LFLiveKit/LFVideoFrame.h>
-#import <LFLiveKit/LFLiveDebug.h>
-#else
+#ifndef LFLiveKit_h
+#define LFLiveKit_h
+
 #import "LFLiveSession.h"
 #import "LFLiveAudioConfiguration.h"
 #import "LFLiveVideoConfiguration.h"
@@ -24,5 +17,6 @@
 #import "LFLiveStreamInfo.h"
 #import "LFVideoFrame.h"
 #import "LFLiveDebug.h"
+
 #endif
 

LFLiveKit/LFLiveSession.h

@@ -9,14 +9,6 @@
 
 #import <Foundation/Foundation.h>
 #import <AVFoundation/AVFoundation.h>
-#if __has_include(<LFLiveKit/LFLiveKit.h>)
-#import <LFLiveKit/LFLiveStreamInfo.h>
-#import <LFLiveKit/LFAudioFrame.h>
-#import <LFLiveKit/LFVideoFrame.h>
-#import <LFLiveKit/LFLiveAudioConfiguration.h>
-#import <LFLiveKit/LFLiveVideoConfiguration.h>
-#import <LFLiveKit/LFLiveDebug.h>
-#else
 #import "LFLiveStreamInfo.h"
 #import "LFAudioFrame.h"
 #import "LFVideoFrame.h"
@@ -24,8 +16,6 @@
 #import "LFLiveVideoConfiguration.h"
 #import "LFLiveDebug.h"
 
-#endif
-
 
 
 typedef NS_ENUM(NSInteger,LFLiveCaptureType) {

LFLiveKit/Vendor/GPUImage/GLProgram.h

@@ -0,0 +1,42 @@
+//  This is Jeff LaMarche's GLProgram OpenGL shader wrapper class from his OpenGL ES 2.0 book.
+//  A description of this can be found at his page on the topic:
+//  http://iphonedevelopment.blogspot.com/2010/11/opengl-es-20-for-ios-chapter-4.html
+//  I've extended this to be able to take programs as NSStrings in addition to files, for baked-in shaders
+
+#import <Foundation/Foundation.h>
+
+#if TARGET_IPHONE_SIMULATOR || TARGET_OS_IPHONE
+#import <OpenGLES/ES2/gl.h>
+#import <OpenGLES/ES2/glext.h>
+#else
+#import <OpenGL/OpenGL.h>
+#import <OpenGL/gl.h>
+#endif
+
+@interface GLProgram : NSObject 
+{
+    NSMutableArray  *attributes;
+    NSMutableArray  *uniforms;
+    GLuint          program,
+	vertShader, 
+	fragShader;	
+}
+
+@property(readwrite, nonatomic) BOOL initialized;
+@property(readwrite, copy, nonatomic) NSString *vertexShaderLog;
+@property(readwrite, copy, nonatomic) NSString *fragmentShaderLog;
+@property(readwrite, copy, nonatomic) NSString *programLog;
+
+- (id)initWithVertexShaderString:(NSString *)vShaderString 
+            fragmentShaderString:(NSString *)fShaderString;
+- (id)initWithVertexShaderString:(NSString *)vShaderString 
+          fragmentShaderFilename:(NSString *)fShaderFilename;
+- (id)initWithVertexShaderFilename:(NSString *)vShaderFilename 
+            fragmentShaderFilename:(NSString *)fShaderFilename;
+- (void)addAttribute:(NSString *)attributeName;
+- (GLuint)attributeIndex:(NSString *)attributeName;
+- (GLuint)uniformIndex:(NSString *)uniformName;
+- (BOOL)link;
+- (void)use;
+- (void)validate;
+@end

LFLiveKit/Vendor/GPUImage/GLProgram.m

@@ -0,0 +1,236 @@
+//  This is Jeff LaMarche's GLProgram OpenGL shader wrapper class from his OpenGL ES 2.0 book.
+//  A description of this can be found at his page on the topic:
+//  http://iphonedevelopment.blogspot.com/2010/11/opengl-es-20-for-ios-chapter-4.html
+
+
+#import "GLProgram.h"
+// START:typedefs
+#pragma mark Function Pointer Definitions
+typedef void (*GLInfoFunction)(GLuint program, GLenum pname, GLint* params);
+typedef void (*GLLogFunction) (GLuint program, GLsizei bufsize, GLsizei* length, GLchar* infolog);
+// END:typedefs
+#pragma mark -
+#pragma mark Private Extension Method Declaration
+// START:extension
+@interface GLProgram()
+
+- (BOOL)compileShader:(GLuint *)shader 
+                 type:(GLenum)type 
+               string:(NSString *)shaderString;
+@end
+// END:extension
+#pragma mark -
+
+@implementation GLProgram
+// START:init
+
+@synthesize initialized = _initialized;
+
+- (id)initWithVertexShaderString:(NSString *)vShaderString 
+            fragmentShaderString:(NSString *)fShaderString;
+{
+    if ((self = [super init])) 
+    {
+        _initialized = NO;
+        
+        attributes = [[NSMutableArray alloc] init];
+        uniforms = [[NSMutableArray alloc] init];
+        program = glCreateProgram();
+        
+        if (![self compileShader:&vertShader 
+                            type:GL_VERTEX_SHADER 
+                          string:vShaderString])
+        {
+            NSLog(@"Failed to compile vertex shader");
+        }
+        
+        // Create and compile fragment shader
+        if (![self compileShader:&fragShader 
+                            type:GL_FRAGMENT_SHADER 
+                          string:fShaderString])
+        {
+            NSLog(@"Failed to compile fragment shader");
+        }
+        
+        glAttachShader(program, vertShader);
+        glAttachShader(program, fragShader);
+    }
+    
+    return self;
+}
+
+- (id)initWithVertexShaderString:(NSString *)vShaderString 
+          fragmentShaderFilename:(NSString *)fShaderFilename;
+{
+    NSString *fragShaderPathname = [[NSBundle mainBundle] pathForResource:fShaderFilename ofType:@"fsh"];
+    NSString *fragmentShaderString = [NSString stringWithContentsOfFile:fragShaderPathname encoding:NSUTF8StringEncoding error:nil];
+    
+    if ((self = [self initWithVertexShaderString:vShaderString fragmentShaderString:fragmentShaderString])) 
+    {
+    }
+    
+    return self;
+}
+
+- (id)initWithVertexShaderFilename:(NSString *)vShaderFilename 
+            fragmentShaderFilename:(NSString *)fShaderFilename;
+{
+    NSString *vertShaderPathname = [[NSBundle mainBundle] pathForResource:vShaderFilename ofType:@"vsh"];
+    NSString *vertexShaderString = [NSString stringWithContentsOfFile:vertShaderPathname encoding:NSUTF8StringEncoding error:nil];
+
+    NSString *fragShaderPathname = [[NSBundle mainBundle] pathForResource:fShaderFilename ofType:@"fsh"];
+    NSString *fragmentShaderString = [NSString stringWithContentsOfFile:fragShaderPathname encoding:NSUTF8StringEncoding error:nil];
+    
+    if ((self = [self initWithVertexShaderString:vertexShaderString fragmentShaderString:fragmentShaderString])) 
+    {
+    }
+    
+    return self;
+}
+// END:init
+// START:compile
+- (BOOL)compileShader:(GLuint *)shader 
+                 type:(GLenum)type 
+               string:(NSString *)shaderString
+{
+//    CFAbsoluteTime startTime = CFAbsoluteTimeGetCurrent();
+
+    GLint status;
+    const GLchar *source;
+    
+    source = 
+      (GLchar *)[shaderString UTF8String];
+    if (!source)
+    {
+        NSLog(@"Failed to load vertex shader");
+        return NO;
+    }
+    
+    *shader = glCreateShader(type);
+    glShaderSource(*shader, 1, &source, NULL);
+    glCompileShader(*shader);
+    
+    glGetShaderiv(*shader, GL_COMPILE_STATUS, &status);
+
+	if (status != GL_TRUE)
+	{
+		GLint logLength;
+		glGetShaderiv(*shader, GL_INFO_LOG_LENGTH, &logLength);
+		if (logLength > 0)
+		{
+			GLchar *log = (GLchar *)malloc(logLength);
+			glGetShaderInfoLog(*shader, logLength, &logLength, log);
+            if (shader == &vertShader)
+            {
+                self.vertexShaderLog = [NSString stringWithFormat:@"%s", log];
+            }
+            else
+            {
+                self.fragmentShaderLog = [NSString stringWithFormat:@"%s", log];
+            }
+
+			free(log);
+		}
+	}	
+	
+//    CFAbsoluteTime linkTime = (CFAbsoluteTimeGetCurrent() - startTime);
+//    NSLog(@"Compiled in %f ms", linkTime * 1000.0);
+
+    return status == GL_TRUE;
+}
+// END:compile
+#pragma mark -
+// START:addattribute
+- (void)addAttribute:(NSString *)attributeName
+{
+    if (![attributes containsObject:attributeName])
+    {
+        [attributes addObject:attributeName];
+        glBindAttribLocation(program, 
+                             (GLuint)[attributes indexOfObject:attributeName],
+                             [attributeName UTF8String]);
+    }
+}
+// END:addattribute
+// START:indexmethods
+- (GLuint)attributeIndex:(NSString *)attributeName
+{
+    return (GLuint)[attributes indexOfObject:attributeName];
+}
+- (GLuint)uniformIndex:(NSString *)uniformName
+{
+    return glGetUniformLocation(program, [uniformName UTF8String]);
+}
+// END:indexmethods
+#pragma mark -
+// START:link
+- (BOOL)link
+{
+//    CFAbsoluteTime startTime = CFAbsoluteTimeGetCurrent();
+
+    GLint status;
+    
+    glLinkProgram(program);
+    
+    glGetProgramiv(program, GL_LINK_STATUS, &status);
+    if (status == GL_FALSE)
+        return NO;
+    
+    if (vertShader)
+    {
+        glDeleteShader(vertShader);
+        vertShader = 0;
+    }
+    if (fragShader)
+    {
+        glDeleteShader(fragShader);
+        fragShader = 0;
+    }
+    
+    self.initialized = YES;
+
+//    CFAbsoluteTime linkTime = (CFAbsoluteTimeGetCurrent() - startTime);
+//    NSLog(@"Linked in %f ms", linkTime * 1000.0);
+
+    return YES;
+}
+// END:link
+// START:use
+- (void)use
+{
+    glUseProgram(program);
+}
+// END:use
+#pragma mark -
+
+- (void)validate;
+{
+	GLint logLength;
+	
+	glValidateProgram(program);
+	glGetProgramiv(program, GL_INFO_LOG_LENGTH, &logLength);
+	if (logLength > 0)
+	{
+		GLchar *log = (GLchar *)malloc(logLength);
+		glGetProgramInfoLog(program, logLength, &logLength, log);
+        self.programLog = [NSString stringWithFormat:@"%s", log];
+		free(log);
+	}	
+}
+
+#pragma mark -
+// START:dealloc
+- (void)dealloc
+{
+    if (vertShader)
+        glDeleteShader(vertShader);
+        
+    if (fragShader)
+        glDeleteShader(fragShader);
+    
+    if (program)
+        glDeleteProgram(program);
+       
+}
+// END:dealloc
+@end

LFLiveKit/Vendor/GPUImage/GPUImage.h

@@ -0,0 +1,170 @@
+#import "GLProgram.h"
+
+// Base classes
+#import "GPUImageContext.h"
+#import "GPUImageOutput.h"
+#import "GPUImageView.h"
+#import "GPUImageVideoCamera.h"
+#import "GPUImageStillCamera.h"
+#import "GPUImageMovie.h"
+#import "GPUImagePicture.h"
+#import "GPUImageRawDataInput.h"
+#import "GPUImageRawDataOutput.h"
+#import "GPUImageMovieWriter.h"
+#import "GPUImageFilterPipeline.h"
+#import "GPUImageTextureOutput.h"
+#import "GPUImageFilterGroup.h"
+#import "GPUImageTextureInput.h"
+#import "GPUImageUIElement.h"
+#import "GPUImageBuffer.h"
+#import "GPUImageFramebuffer.h"
+#import "GPUImageFramebufferCache.h"
+
+// Filters
+#import "GPUImageFilter.h"
+#import "GPUImageTwoInputFilter.h"
+#import "GPUImagePixellateFilter.h"
+#import "GPUImagePixellatePositionFilter.h"
+#import "GPUImageSepiaFilter.h"
+#import "GPUImageColorInvertFilter.h"
+#import "GPUImageSaturationFilter.h"
+#import "GPUImageContrastFilter.h"
+#import "GPUImageExposureFilter.h"
+#import "GPUImageBrightnessFilter.h"
+#import "GPUImageLevelsFilter.h"
+#import "GPUImageSharpenFilter.h"
+#import "GPUImageGammaFilter.h"
+#import "GPUImageSobelEdgeDetectionFilter.h"
+#import "GPUImageSketchFilter.h"
+#import "GPUImageToonFilter.h"
+#import "GPUImageSmoothToonFilter.h"
+#import "GPUImageMultiplyBlendFilter.h"
+#import "GPUImageDissolveBlendFilter.h"
+#import "GPUImageKuwaharaFilter.h"
+#import "GPUImageKuwaharaRadius3Filter.h"
+#import "GPUImageVignetteFilter.h"
+#import "GPUImageGaussianBlurFilter.h"
+#import "GPUImageGaussianBlurPositionFilter.h"
+#import "GPUImageGaussianSelectiveBlurFilter.h"
+#import "GPUImageOverlayBlendFilter.h"
+#import "GPUImageDarkenBlendFilter.h"
+#import "GPUImageLightenBlendFilter.h"
+#import "GPUImageSwirlFilter.h"
+#import "GPUImageSourceOverBlendFilter.h"
+#import "GPUImageColorBurnBlendFilter.h"
+#import "GPUImageColorDodgeBlendFilter.h"
+#import "GPUImageScreenBlendFilter.h"
+#import "GPUImageExclusionBlendFilter.h"
+#import "GPUImageDifferenceBlendFilter.h"
+#import "GPUImageSubtractBlendFilter.h"
+#import "GPUImageHardLightBlendFilter.h"
+#import "GPUImageSoftLightBlendFilter.h"
+#import "GPUImageColorBlendFilter.h"
+#import "GPUImageHueBlendFilter.h"
+#import "GPUImageSaturationBlendFilter.h"
+#import "GPUImageLuminosityBlendFilter.h"
+#import "GPUImageCropFilter.h"
+#import "GPUImageGrayscaleFilter.h"
+#import "GPUImageTransformFilter.h"
+#import "GPUImageChromaKeyBlendFilter.h"
+#import "GPUImageHazeFilter.h"
+#import "GPUImageLuminanceThresholdFilter.h"
+#import "GPUImagePosterizeFilter.h"
+#import "GPUImageBoxBlurFilter.h"
+#import "GPUImageAdaptiveThresholdFilter.h"
+#import "GPUImageSolarizeFilter.h"
+#import "GPUImageUnsharpMaskFilter.h"
+#import "GPUImageBulgeDistortionFilter.h"
+#import "GPUImagePinchDistortionFilter.h"
+#import "GPUImageCrosshatchFilter.h"
+#import "GPUImageCGAColorspaceFilter.h"
+#import "GPUImagePolarPixellateFilter.h"
+#import "GPUImageStretchDistortionFilter.h"
+#import "GPUImagePerlinNoiseFilter.h"
+#import "GPUImageJFAVoronoiFilter.h"
+#import "GPUImageVoronoiConsumerFilter.h"
+#import "GPUImageMosaicFilter.h"
+#import "GPUImageTiltShiftFilter.h"
+#import "GPUImage3x3ConvolutionFilter.h"
+#import "GPUImageEmbossFilter.h"
+#import "GPUImageCannyEdgeDetectionFilter.h"
+#import "GPUImageThresholdEdgeDetectionFilter.h"
+#import "GPUImageMaskFilter.h"
+#import "GPUImageHistogramFilter.h"
+#import "GPUImageHistogramGenerator.h"
+#import "GPUImageHistogramEqualizationFilter.h"
+#import "GPUImagePrewittEdgeDetectionFilter.h"
+#import "GPUImageXYDerivativeFilter.h"
+#import "GPUImageHarrisCornerDetectionFilter.h"
+#import "GPUImageAlphaBlendFilter.h"
+#import "GPUImageNormalBlendFilter.h"
+#import "GPUImageNonMaximumSuppressionFilter.h"
+#import "GPUImageRGBFilter.h"
+#import "GPUImageMedianFilter.h"
+#import "GPUImageBilateralFilter.h"
+#import "GPUImageCrosshairGenerator.h"
+#import "GPUImageToneCurveFilter.h"
+#import "GPUImageNobleCornerDetectionFilter.h"
+#import "GPUImageShiTomasiFeatureDetectionFilter.h"
+#import "GPUImageErosionFilter.h"
+#import "GPUImageRGBErosionFilter.h"
+#import "GPUImageDilationFilter.h"
+#import "GPUImageRGBDilationFilter.h"
+#import "GPUImageOpeningFilter.h"
+#import "GPUImageRGBOpeningFilter.h"
+#import "GPUImageClosingFilter.h"
+#import "GPUImageRGBClosingFilter.h"
+#import "GPUImageColorPackingFilter.h"
+#import "GPUImageSphereRefractionFilter.h"
+#import "GPUImageMonochromeFilter.h"
+#import "GPUImageOpacityFilter.h"
+#import "GPUImageHighlightShadowFilter.h"
+#import "GPUImageFalseColorFilter.h"
+#import "GPUImageHSBFilter.h"
+#import "GPUImageHueFilter.h"
+#import "GPUImageGlassSphereFilter.h"
+#import "GPUImageLookupFilter.h"
+#import "GPUImageAmatorkaFilter.h"
+#import "GPUImageMissEtikateFilter.h"
+#import "GPUImageSoftEleganceFilter.h"
+#import "GPUImageAddBlendFilter.h"
+#import "GPUImageDivideBlendFilter.h"
+#import "GPUImagePolkaDotFilter.h"
+#import "GPUImageLocalBinaryPatternFilter.h"
+#import "GPUImageColorLocalBinaryPatternFilter.h"
+#import "GPUImageLanczosResamplingFilter.h"
+#import "GPUImageAverageColor.h"
+#import "GPUImageSolidColorGenerator.h"
+#import "GPUImageLuminosity.h"
+#import "GPUImageAverageLuminanceThresholdFilter.h"
+#import "GPUImageWhiteBalanceFilter.h"
+#import "GPUImageChromaKeyFilter.h"
+#import "GPUImageLowPassFilter.h"
+#import "GPUImageHighPassFilter.h"
+#import "GPUImageMotionDetector.h"
+#import "GPUImageHalftoneFilter.h"
+#import "GPUImageThresholdedNonMaximumSuppressionFilter.h"
+#import "GPUImageHoughTransformLineDetector.h"
+#import "GPUImageParallelCoordinateLineTransformFilter.h"
+#import "GPUImageThresholdSketchFilter.h"
+#import "GPUImageLineGenerator.h"
+#import "GPUImageLinearBurnBlendFilter.h"
+#import "GPUImageGaussianBlurPositionFilter.h"
+#import "GPUImagePixellatePositionFilter.h"
+#import "GPUImageTwoInputCrossTextureSamplingFilter.h"
+#import "GPUImagePoissonBlendFilter.h"
+#import "GPUImageMotionBlurFilter.h"
+#import "GPUImageZoomBlurFilter.h"
+#import "GPUImageLaplacianFilter.h"
+#import "GPUImageiOSBlurFilter.h"
+#import "GPUImageLuminanceRangeFilter.h"
+#import "GPUImageDirectionalNonMaximumSuppressionFilter.h"
+#import "GPUImageDirectionalSobelEdgeDetectionFilter.h"
+#import "GPUImageSingleComponentGaussianBlurFilter.h"
+#import "GPUImageThreeInputFilter.h"
+#import "GPUImageFourInputFilter.h"
+#import "GPUImageWeakPixelInclusionFilter.h"
+#import "GPUImageColorConversion.h"
+#import "GPUImageColourFASTFeatureDetector.h"
+#import "GPUImageColourFASTSamplingOperation.h"
+

LFLiveKit/Vendor/GPUImage/GPUImage3x3ConvolutionFilter.h

@@ -0,0 +1,18 @@
+#import "GPUImage3x3TextureSamplingFilter.h"
+
+/** Runs a 3x3 convolution kernel against the image
+ */
+@interface GPUImage3x3ConvolutionFilter : GPUImage3x3TextureSamplingFilter
+{
+    GLint convolutionMatrixUniform;
+}
+
+/** Convolution kernel to run against the image
+ 
+ The convolution kernel is a 3x3 matrix of values to apply to the pixel and its 8 surrounding pixels.
+ The matrix is specified in row-major order, with the top left pixel being one.one and the bottom right three.three
+ If the values in the matrix don't add up to 1.0, the image could be brightened or darkened.
+ */
+@property(readwrite, nonatomic) GPUMatrix3x3 convolutionKernel;
+
+@end

LFLiveKit/Vendor/GPUImage/GPUImage3x3ConvolutionFilter.m

@@ -0,0 +1,128 @@
+#import "GPUImage3x3ConvolutionFilter.h"
+
+#if TARGET_IPHONE_SIMULATOR || TARGET_OS_IPHONE
+NSString *const kGPUImage3x3ConvolutionFragmentShaderString = SHADER_STRING
+(
+ precision highp float;
+
+ uniform sampler2D inputImageTexture;
+ 
+ uniform mediump mat3 convolutionMatrix;
+ 
+ varying vec2 textureCoordinate;
+ varying vec2 leftTextureCoordinate;
+ varying vec2 rightTextureCoordinate;
+ 
+ varying vec2 topTextureCoordinate;
+ varying vec2 topLeftTextureCoordinate;
+ varying vec2 topRightTextureCoordinate;
+ 
+ varying vec2 bottomTextureCoordinate;
+ varying vec2 bottomLeftTextureCoordinate;
+ varying vec2 bottomRightTextureCoordinate;
+ 
+ void main()
+ {
+     mediump vec3 bottomColor = texture2D(inputImageTexture, bottomTextureCoordinate).rgb;
+     mediump vec3 bottomLeftColor = texture2D(inputImageTexture, bottomLeftTextureCoordinate).rgb;
+     mediump vec3 bottomRightColor = texture2D(inputImageTexture, bottomRightTextureCoordinate).rgb;
+     mediump vec4 centerColor = texture2D(inputImageTexture, textureCoordinate);
+     mediump vec3 leftColor = texture2D(inputImageTexture, leftTextureCoordinate).rgb;
+     mediump vec3 rightColor = texture2D(inputImageTexture, rightTextureCoordinate).rgb;
+     mediump vec3 topColor = texture2D(inputImageTexture, topTextureCoordinate).rgb;
+     mediump vec3 topRightColor = texture2D(inputImageTexture, topRightTextureCoordinate).rgb;
+     mediump vec3 topLeftColor = texture2D(inputImageTexture, topLeftTextureCoordinate).rgb;
+
+     mediump vec3 resultColor = topLeftColor * convolutionMatrix[0][0] + topColor * convolutionMatrix[0][1] + topRightColor * convolutionMatrix[0][2];
+     resultColor += leftColor * convolutionMatrix[1][0] + centerColor.rgb * convolutionMatrix[1][1] + rightColor * convolutionMatrix[1][2];
+     resultColor += bottomLeftColor * convolutionMatrix[2][0] + bottomColor * convolutionMatrix[2][1] + bottomRightColor * convolutionMatrix[2][2];
+
+     gl_FragColor = vec4(resultColor, centerColor.a);
+ }
+);                                                                         
+#else
+NSString *const kGPUImage3x3ConvolutionFragmentShaderString = SHADER_STRING
+(
+ uniform sampler2D inputImageTexture;
+ 
+ uniform mat3 convolutionMatrix;
+ 
+ varying vec2 textureCoordinate;
+ varying vec2 leftTextureCoordinate;
+ varying vec2 rightTextureCoordinate;
+ 
+ varying vec2 topTextureCoordinate;
+ varying vec2 topLeftTextureCoordinate;
+ varying vec2 topRightTextureCoordinate;
+ 
+ varying vec2 bottomTextureCoordinate;
+ varying vec2 bottomLeftTextureCoordinate;
+ varying vec2 bottomRightTextureCoordinate;
+ 
+ void main()
+ {
+     vec3 bottomColor = texture2D(inputImageTexture, bottomTextureCoordinate).rgb;
+     vec3 bottomLeftColor = texture2D(inputImageTexture, bottomLeftTextureCoordinate).rgb;
+     vec3 bottomRightColor = texture2D(inputImageTexture, bottomRightTextureCoordinate).rgb;
+     vec4 centerColor = texture2D(inputImageTexture, textureCoordinate);
+     vec3 leftColor = texture2D(inputImageTexture, leftTextureCoordinate).rgb;
+     vec3 rightColor = texture2D(inputImageTexture, rightTextureCoordinate).rgb;
+     vec3 topColor = texture2D(inputImageTexture, topTextureCoordinate).rgb;
+     vec3 topRightColor = texture2D(inputImageTexture, topRightTextureCoordinate).rgb;
+     vec3 topLeftColor = texture2D(inputImageTexture, topLeftTextureCoordinate).rgb;
+     
+     vec3 resultColor = topLeftColor * convolutionMatrix[0][0] + topColor * convolutionMatrix[0][1] + topRightColor * convolutionMatrix[0][2];
+     resultColor += leftColor * convolutionMatrix[1][0] + centerColor.rgb * convolutionMatrix[1][1] + rightColor * convolutionMatrix[1][2];
+     resultColor += bottomLeftColor * convolutionMatrix[2][0] + bottomColor * convolutionMatrix[2][1] + bottomRightColor * convolutionMatrix[2][2];
+     
+     gl_FragColor = vec4(resultColor, centerColor.a);
+ }
+);
+#endif
+
+@implementation GPUImage3x3ConvolutionFilter
+
+@synthesize convolutionKernel = _convolutionKernel;
+
+#pragma mark -
+#pragma mark Initialization and teardown
+
+- (id)init;
+{
+    if (!(self = [self initWithFragmentShaderFromString:kGPUImage3x3ConvolutionFragmentShaderString]))
+    {
+		return nil;
+    }
+
+    self.convolutionKernel = (GPUMatrix3x3){
+        {0.f, 0.f, 0.f},
+        {0.f, 1.f, 0.f},
+        {0.f, 0.f, 0.f}
+    };
+
+    return self;
+}
+
+- (id)initWithFragmentShaderFromString:(NSString *)fragmentShaderString;
+{
+    if (!(self = [super initWithFragmentShaderFromString:fragmentShaderString]))
+    {
+        return nil;
+    }
+    
+    convolutionMatrixUniform = [filterProgram uniformIndex:@"convolutionMatrix"];
+    
+    return self;
+}
+
+#pragma mark -
+#pragma mark Accessors
+
+- (void)setConvolutionKernel:(GPUMatrix3x3)newValue;
+{
+    _convolutionKernel = newValue;
+    
+    [self setMatrix3f:_convolutionKernel forUniform:convolutionMatrixUniform program:filterProgram];
+}
+
+@end

LFLiveKit/Vendor/GPUImage/GPUImage3x3TextureSamplingFilter.h

@@ -0,0 +1,18 @@
+#import "GPUImageFilter.h"
+
+extern NSString *const kGPUImageNearbyTexelSamplingVertexShaderString;
+
+@interface GPUImage3x3TextureSamplingFilter : GPUImageFilter
+{
+    GLint texelWidthUniform, texelHeightUniform;
+    
+    CGFloat texelWidth, texelHeight;
+    BOOL hasOverriddenImageSizeFactor;
+}
+
+// The texel width and height determines how far out to sample from this texel. By default, this is the normalized width of a pixel, but this can be overridden for different effects.
+@property(readwrite, nonatomic) CGFloat texelWidth; 
+@property(readwrite, nonatomic) CGFloat texelHeight; 
+
+
+@end

LFLiveKit/Vendor/GPUImage/GPUImage3x3TextureSamplingFilter.m

@@ -0,0 +1,121 @@
+#import "GPUImage3x3TextureSamplingFilter.h"
+
+// Override vertex shader to remove dependent texture reads 
+NSString *const kGPUImageNearbyTexelSamplingVertexShaderString = SHADER_STRING
+(
+ attribute vec4 position;
+ attribute vec4 inputTextureCoordinate;
+ 
+ uniform float texelWidth;
+ uniform float texelHeight; 
+ 
+ varying vec2 textureCoordinate;
+ varying vec2 leftTextureCoordinate;
+ varying vec2 rightTextureCoordinate;
+ 
+ varying vec2 topTextureCoordinate;
+ varying vec2 topLeftTextureCoordinate;
+ varying vec2 topRightTextureCoordinate;
+ 
+ varying vec2 bottomTextureCoordinate;
+ varying vec2 bottomLeftTextureCoordinate;
+ varying vec2 bottomRightTextureCoordinate;
+ 
+ void main()
+ {
+     gl_Position = position;
+     
+     vec2 widthStep = vec2(texelWidth, 0.0);
+     vec2 heightStep = vec2(0.0, texelHeight);
+     vec2 widthHeightStep = vec2(texelWidth, texelHeight);
+     vec2 widthNegativeHeightStep = vec2(texelWidth, -texelHeight);
+     
+     textureCoordinate = inputTextureCoordinate.xy;
+     leftTextureCoordinate = inputTextureCoordinate.xy - widthStep;
+     rightTextureCoordinate = inputTextureCoordinate.xy + widthStep;
+     
+     topTextureCoordinate = inputTextureCoordinate.xy - heightStep;
+     topLeftTextureCoordinate = inputTextureCoordinate.xy - widthHeightStep;
+     topRightTextureCoordinate = inputTextureCoordinate.xy + widthNegativeHeightStep;
+     
+     bottomTextureCoordinate = inputTextureCoordinate.xy + heightStep;
+     bottomLeftTextureCoordinate = inputTextureCoordinate.xy - widthNegativeHeightStep;
+     bottomRightTextureCoordinate = inputTextureCoordinate.xy + widthHeightStep;
+ }
+);
+
+
+@implementation GPUImage3x3TextureSamplingFilter
+
+@synthesize texelWidth = _texelWidth; 
+@synthesize texelHeight = _texelHeight; 
+
+#pragma mark -
+#pragma mark Initialization and teardown
+
+- (id)initWithVertexShaderFromString:(NSString *)vertexShaderString fragmentShaderFromString:(NSString *)fragmentShaderString;
+{
+    if (!(self = [super initWithVertexShaderFromString:vertexShaderString fragmentShaderFromString:fragmentShaderString]))
+    {
+        return nil;
+    }
+    
+    texelWidthUniform = [filterProgram uniformIndex:@"texelWidth"];
+    texelHeightUniform = [filterProgram uniformIndex:@"texelHeight"];
+    
+    return self;
+}
+
+- (id)initWithFragmentShaderFromString:(NSString *)fragmentShaderString;
+{
+    if (!(self = [self initWithVertexShaderFromString:kGPUImageNearbyTexelSamplingVertexShaderString fragmentShaderFromString:fragmentShaderString]))
+    {
+        return nil;
+    }
+    
+    return self;
+}
+
+- (void)setupFilterForSize:(CGSize)filterFrameSize;
+{
+    if (!hasOverriddenImageSizeFactor)
+    {
+        _texelWidth = 1.0 / filterFrameSize.width;
+        _texelHeight = 1.0 / filterFrameSize.height;
+        
+        runSynchronouslyOnVideoProcessingQueue(^{
+            [GPUImageContext setActiveShaderProgram:filterProgram];
+            if (GPUImageRotationSwapsWidthAndHeight(inputRotation))
+            {
+                glUniform1f(texelWidthUniform, _texelHeight);
+                glUniform1f(texelHeightUniform, _texelWidth);
+            }
+            else
+            {
+                glUniform1f(texelWidthUniform, _texelWidth);
+                glUniform1f(texelHeightUniform, _texelHeight);
+            }
+        });
+    }
+}
+
+#pragma mark -
+#pragma mark Accessors
+
+- (void)setTexelWidth:(CGFloat)newValue;
+{
+    hasOverriddenImageSizeFactor = YES;
+    _texelWidth = newValue;
+    
+    [self setFloat:_texelWidth forUniform:texelWidthUniform program:filterProgram];
+}
+
+- (void)setTexelHeight:(CGFloat)newValue;
+{
+    hasOverriddenImageSizeFactor = YES;
+    _texelHeight = newValue;
+
+    [self setFloat:_texelHeight forUniform:texelHeightUniform program:filterProgram];
+}
+
+@end

LFLiveKit/Vendor/GPUImage/GPUImageAdaptiveThresholdFilter.h

@@ -0,0 +1,9 @@
+#import "GPUImageFilterGroup.h"
+
+@interface GPUImageAdaptiveThresholdFilter : GPUImageFilterGroup
+
+/** A multiplier for the background averaging blur radius in pixels, with a default of 4
+ */
+@property(readwrite, nonatomic) CGFloat blurRadiusInPixels;
+
+@end

LFLiveKit/Vendor/GPUImage/GPUImageAdaptiveThresholdFilter.m

@@ -0,0 +1,100 @@
+#import "GPUImageAdaptiveThresholdFilter.h"
+#import "GPUImageFilter.h"
+#import "GPUImageTwoInputFilter.h"
+#import "GPUImageGrayscaleFilter.h"
+#import "GPUImageBoxBlurFilter.h"
+
+#if TARGET_IPHONE_SIMULATOR || TARGET_OS_IPHONE
+NSString *const kGPUImageAdaptiveThresholdFragmentShaderString = SHADER_STRING
+( 
+ varying highp vec2 textureCoordinate;
+ varying highp vec2 textureCoordinate2;
+ 
+ uniform sampler2D inputImageTexture;
+ uniform sampler2D inputImageTexture2; 
+ 
+ void main()
+ {
+     highp float blurredInput = texture2D(inputImageTexture, textureCoordinate).r;
+     highp float localLuminance = texture2D(inputImageTexture2, textureCoordinate2).r;
+     highp float thresholdResult = step(blurredInput - 0.05, localLuminance);
+     
+     gl_FragColor = vec4(vec3(thresholdResult), 1.0);
+ }
+);
+#else
+NSString *const kGPUImageAdaptiveThresholdFragmentShaderString = SHADER_STRING
+(
+ varying vec2 textureCoordinate;
+ varying vec2 textureCoordinate2;
+ 
+ uniform sampler2D inputImageTexture;
+ uniform sampler2D inputImageTexture2;
+ 
+ void main()
+ {
+     float blurredInput = texture2D(inputImageTexture, textureCoordinate).r;
+     float localLuminance = texture2D(inputImageTexture2, textureCoordinate2).r;
+     float thresholdResult = step(blurredInput - 0.05, localLuminance);
+     
+     gl_FragColor = vec4(vec3(thresholdResult), 1.0);
+ }
+);
+#endif
+
+@interface GPUImageAdaptiveThresholdFilter()
+{
+    GPUImageBoxBlurFilter *boxBlurFilter;
+}
+@end
+
+@implementation GPUImageAdaptiveThresholdFilter
+
+#pragma mark -
+#pragma mark Initialization and teardown
+
+- (id)init;
+{
+    if (!(self = [super init]))
+    {
+		return nil;
+    }
+
+    // First pass: reduce to luminance
+    GPUImageGrayscaleFilter *luminanceFilter = [[GPUImageGrayscaleFilter alloc] init];
+    [self addFilter:luminanceFilter];
+    
+    // Second pass: perform a box blur
+    boxBlurFilter = [[GPUImageBoxBlurFilter alloc] init];
+    [self addFilter:boxBlurFilter];
+    
+    // Third pass: compare the blurred background luminance to the local value
+    GPUImageFilter *adaptiveThresholdFilter = [[GPUImageTwoInputFilter alloc] initWithFragmentShaderFromString:kGPUImageAdaptiveThresholdFragmentShaderString];
+    [self addFilter:adaptiveThresholdFilter];
+    
+    [luminanceFilter addTarget:boxBlurFilter];
+    
+    [boxBlurFilter addTarget:adaptiveThresholdFilter];
+    // To prevent double updating of this filter, disable updates from the sharp luminance image side
+    [luminanceFilter addTarget:adaptiveThresholdFilter];
+    
+    self.initialFilters = [NSArray arrayWithObject:luminanceFilter];
+    self.terminalFilter = adaptiveThresholdFilter;
+    
+    return self;
+}
+
+#pragma mark -
+#pragma mark Accessors
+
+- (void)setBlurRadiusInPixels:(CGFloat)newValue;
+{
+    boxBlurFilter.blurRadiusInPixels = newValue;
+}
+
+- (CGFloat)blurRadiusInPixels;
+{
+    return boxBlurFilter.blurRadiusInPixels;
+}
+
+@end

LFLiveKit/Vendor/GPUImage/GPUImageAddBlendFilter.h

@@ -0,0 +1,5 @@
+#import "GPUImageTwoInputFilter.h"
+
+@interface GPUImageAddBlendFilter : GPUImageTwoInputFilter
+
+@end

LFLiveKit/Vendor/GPUImage/GPUImageAddBlendFilter.m

@@ -0,0 +1,100 @@
+#import "GPUImageAddBlendFilter.h"
+
+#if TARGET_IPHONE_SIMULATOR || TARGET_OS_IPHONE
+NSString *const kGPUImageAddBlendFragmentShaderString = SHADER_STRING
+(
+ varying highp vec2 textureCoordinate;
+ varying highp vec2 textureCoordinate2;
+
+ uniform sampler2D inputImageTexture;
+ uniform sampler2D inputImageTexture2;
+ 
+ void main()
+ {
+	 lowp vec4 base = texture2D(inputImageTexture, textureCoordinate);
+	 lowp vec4 overlay = texture2D(inputImageTexture2, textureCoordinate2);
+	 
+   mediump float r;
+   if (overlay.r * base.a + base.r * overlay.a >= overlay.a * base.a) {
+     r = overlay.a * base.a + overlay.r * (1.0 - base.a) + base.r * (1.0 - overlay.a);
+   } else {
+     r = overlay.r + base.r;
+   }
+
+   mediump float g;
+   if (overlay.g * base.a + base.g * overlay.a >= overlay.a * base.a) {
+     g = overlay.a * base.a + overlay.g * (1.0 - base.a) + base.g * (1.0 - overlay.a);
+   } else {
+     g = overlay.g + base.g;
+   }
+
+   mediump float b;
+   if (overlay.b * base.a + base.b * overlay.a >= overlay.a * base.a) {
+     b = overlay.a * base.a + overlay.b * (1.0 - base.a) + base.b * (1.0 - overlay.a);
+   } else {
+     b = overlay.b + base.b;
+   }
+
+   mediump float a = overlay.a + base.a - overlay.a * base.a;
+   
+	 gl_FragColor = vec4(r, g, b, a);
+ }
+);
+#else
+NSString *const kGPUImageAddBlendFragmentShaderString = SHADER_STRING
+(
+ varying vec2 textureCoordinate;
+ varying vec2 textureCoordinate2;
+ 
+ uniform sampler2D inputImageTexture;
+ uniform sampler2D inputImageTexture2;
+ 
+ void main()
+ {
+	 vec4 base = texture2D(inputImageTexture, textureCoordinate);
+	 vec4 overlay = texture2D(inputImageTexture2, textureCoordinate2);
+	 
+     float r;
+     if (overlay.r * base.a + base.r * overlay.a >= overlay.a * base.a) {
+         r = overlay.a * base.a + overlay.r * (1.0 - base.a) + base.r * (1.0 - overlay.a);
+     } else {
+         r = overlay.r + base.r;
+     }
+     
+     float g;
+     if (overlay.g * base.a + base.g * overlay.a >= overlay.a * base.a) {
+         g = overlay.a * base.a + overlay.g * (1.0 - base.a) + base.g * (1.0 - overlay.a);
+     } else {
+         g = overlay.g + base.g;
+     }
+     
+     float b;
+     if (overlay.b * base.a + base.b * overlay.a >= overlay.a * base.a) {
+         b = overlay.a * base.a + overlay.b * (1.0 - base.a) + base.b * (1.0 - overlay.a);
+     } else {
+         b = overlay.b + base.b;
+     }
+     
+     float a = overlay.a + base.a - overlay.a * base.a;
+     
+	 gl_FragColor = vec4(r, g, b, a);
+ }
+);
+#endif
+
+
+
+@implementation GPUImageAddBlendFilter
+
+- (id)init;
+{
+    if (!(self = [super initWithFragmentShaderFromString:kGPUImageAddBlendFragmentShaderString]))
+    {
+		return nil;
+    }
+    
+    return self;
+}
+
+@end
+

LFLiveKit/Vendor/GPUImage/GPUImageAlphaBlendFilter.h

@@ -0,0 +1,11 @@
+#import "GPUImageTwoInputFilter.h"
+
+@interface GPUImageAlphaBlendFilter : GPUImageTwoInputFilter
+{
+    GLint mixUniform;
+}
+
+// Mix ranges from 0.0 (only image 1) to 1.0 (only image 2), with 1.0 as the normal level
+@property(readwrite, nonatomic) CGFloat mix; 
+
+@end

LFLiveKit/Vendor/GPUImage/GPUImageAlphaBlendFilter.m

@@ -0,0 +1,72 @@
+#import "GPUImageAlphaBlendFilter.h"
+
+#if TARGET_IPHONE_SIMULATOR || TARGET_OS_IPHONE
+NSString *const kGPUImageAlphaBlendFragmentShaderString = SHADER_STRING
+(
+ varying highp vec2 textureCoordinate;
+ varying highp vec2 textureCoordinate2;
+
+ uniform sampler2D inputImageTexture;
+ uniform sampler2D inputImageTexture2;
+ 
+ uniform lowp float mixturePercent;
+
+ void main()
+ {
+	 lowp vec4 textureColor = texture2D(inputImageTexture, textureCoordinate);
+	 lowp vec4 textureColor2 = texture2D(inputImageTexture2, textureCoordinate2);
+	 
+	 gl_FragColor = vec4(mix(textureColor.rgb, textureColor2.rgb, textureColor2.a * mixturePercent), textureColor.a);
+ }
+);
+#else
+NSString *const kGPUImageAlphaBlendFragmentShaderString = SHADER_STRING
+(
+ varying vec2 textureCoordinate;
+ varying vec2 textureCoordinate2;
+ 
+ uniform sampler2D inputImageTexture;
+ uniform sampler2D inputImageTexture2;
+ 
+ uniform float mixturePercent;
+ 
+ void main()
+ {
+	 vec4 textureColor = texture2D(inputImageTexture, textureCoordinate);
+	 vec4 textureColor2 = texture2D(inputImageTexture2, textureCoordinate2);
+	 
+	 gl_FragColor = vec4(mix(textureColor.rgb, textureColor2.rgb, textureColor2.a * mixturePercent), textureColor.a);
+ }
+);
+#endif
+
+@implementation GPUImageAlphaBlendFilter
+
+@synthesize mix = _mix;
+
+- (id)init;
+{
+    if (!(self = [super initWithFragmentShaderFromString:kGPUImageAlphaBlendFragmentShaderString]))
+    {
+		return nil;
+    }
+    
+    mixUniform = [filterProgram uniformIndex:@"mixturePercent"];
+    self.mix = 0.5;
+    
+    return self;
+}
+
+
+#pragma mark -
+#pragma mark Accessors
+
+- (void)setMix:(CGFloat)newValue;
+{
+    _mix = newValue;
+    
+    [self setFloat:_mix forUniform:mixUniform program:filterProgram];
+}
+
+
+@end

LFLiveKit/Vendor/GPUImage/GPUImageAmatorkaFilter.h

@@ -0,0 +1,17 @@
+#import "GPUImageFilterGroup.h"
+
+@class GPUImagePicture;
+
+/** A photo filter based on Photoshop action by Amatorka
+    http://amatorka.deviantart.com/art/Amatorka-Action-2-121069631
+ */
+
+// Note: If you want to use this effect you have to add lookup_amatorka.png
+//       from Resources folder to your application bundle.
+
+@interface GPUImageAmatorkaFilter : GPUImageFilterGroup
+{
+    GPUImagePicture *lookupImageSource;
+}
+
+@end

LFLiveKit/Vendor/GPUImage/GPUImageAmatorkaFilter.m

@@ -0,0 +1,38 @@
+#import "GPUImageAmatorkaFilter.h"
+#import "GPUImagePicture.h"
+#import "GPUImageLookupFilter.h"
+
+@implementation GPUImageAmatorkaFilter
+
+- (id)init;
+{
+    if (!(self = [super init]))
+    {
+		return nil;
+    }
+
+#if TARGET_IPHONE_SIMULATOR || TARGET_OS_IPHONE
+    UIImage *image = [UIImage imageNamed:@"lookup_amatorka.png"];
+#else
+    NSImage *image = [NSImage imageNamed:@"lookup_amatorka.png"];
+#endif
+    
+    NSAssert(image, @"To use GPUImageAmatorkaFilter you need to add lookup_amatorka.png from GPUImage/framework/Resources to your application bundle.");
+    
+    lookupImageSource = [[GPUImagePicture alloc] initWithImage:image];
+    GPUImageLookupFilter *lookupFilter = [[GPUImageLookupFilter alloc] init];
+    [self addFilter:lookupFilter];
+    
+    [lookupImageSource addTarget:lookupFilter atTextureLocation:1];
+    [lookupImageSource processImage];
+
+    self.initialFilters = [NSArray arrayWithObjects:lookupFilter, nil];
+    self.terminalFilter = lookupFilter;
+    
+    return self;
+}
+
+#pragma mark -
+#pragma mark Accessors
+
+@end

LFLiveKit/Vendor/GPUImage/GPUImageAverageColor.h

@@ -0,0 +1,20 @@
+#import "GPUImageFilter.h"
+
+extern NSString *const kGPUImageColorAveragingVertexShaderString;
+
+@interface GPUImageAverageColor : GPUImageFilter
+{
+    GLint texelWidthUniform, texelHeightUniform;
+    
+    NSUInteger numberOfStages;
+    
+    GLubyte *rawImagePixels;
+    CGSize finalStageSize;
+}
+
+// This block is called on the completion of color averaging for a frame
+@property(nonatomic, copy) void(^colorAverageProcessingFinishedBlock)(CGFloat redComponent, CGFloat greenComponent, CGFloat blueComponent, CGFloat alphaComponent, CMTime frameTime);
+
+- (void)extractAverageColorAtFrameTime:(CMTime)frameTime;
+
+@end

LFLiveKit/Vendor/GPUImage/GPUImageAverageColor.m

@@ -0,0 +1,204 @@
+#import "GPUImageAverageColor.h"
+
+NSString *const kGPUImageColorAveragingVertexShaderString = SHADER_STRING
+(
+ attribute vec4 position;
+ attribute vec4 inputTextureCoordinate;
+ 
+ uniform float texelWidth;
+ uniform float texelHeight;
+ 
+ varying vec2 upperLeftInputTextureCoordinate;
+ varying vec2 upperRightInputTextureCoordinate;
+ varying vec2 lowerLeftInputTextureCoordinate;
+ varying vec2 lowerRightInputTextureCoordinate;
+ 
+ void main()
+ {
+     gl_Position = position;
+     
+     upperLeftInputTextureCoordinate = inputTextureCoordinate.xy + vec2(-texelWidth, -texelHeight);
+     upperRightInputTextureCoordinate = inputTextureCoordinate.xy + vec2(texelWidth, -texelHeight);
+     lowerLeftInputTextureCoordinate = inputTextureCoordinate.xy + vec2(-texelWidth, texelHeight);
+     lowerRightInputTextureCoordinate = inputTextureCoordinate.xy + vec2(texelWidth, texelHeight);
+ }
+ );
+
+#if TARGET_IPHONE_SIMULATOR || TARGET_OS_IPHONE
+NSString *const kGPUImageColorAveragingFragmentShaderString = SHADER_STRING
+(
+ precision highp float;
+ 
+ uniform sampler2D inputImageTexture;
+ 
+ varying highp vec2 outputTextureCoordinate;
+ 
+ varying highp vec2 upperLeftInputTextureCoordinate;
+ varying highp vec2 upperRightInputTextureCoordinate;
+ varying highp vec2 lowerLeftInputTextureCoordinate;
+ varying highp vec2 lowerRightInputTextureCoordinate;
+ 
+ void main()
+ {
+     highp vec4 upperLeftColor = texture2D(inputImageTexture, upperLeftInputTextureCoordinate);
+     highp vec4 upperRightColor = texture2D(inputImageTexture, upperRightInputTextureCoordinate);
+     highp vec4 lowerLeftColor = texture2D(inputImageTexture, lowerLeftInputTextureCoordinate);
+     highp vec4 lowerRightColor = texture2D(inputImageTexture, lowerRightInputTextureCoordinate);
+     
+     gl_FragColor = 0.25 * (upperLeftColor + upperRightColor + lowerLeftColor + lowerRightColor);
+ }
+);
+#else
+NSString *const kGPUImageColorAveragingFragmentShaderString = SHADER_STRING
+(
+ uniform sampler2D inputImageTexture;
+ 
+ varying vec2 outputTextureCoordinate;
+ 
+ varying vec2 upperLeftInputTextureCoordinate;
+ varying vec2 upperRightInputTextureCoordinate;
+ varying vec2 lowerLeftInputTextureCoordinate;
+ varying vec2 lowerRightInputTextureCoordinate;
+ 
+ void main()
+ {
+     vec4 upperLeftColor = texture2D(inputImageTexture, upperLeftInputTextureCoordinate);
+     vec4 upperRightColor = texture2D(inputImageTexture, upperRightInputTextureCoordinate);
+     vec4 lowerLeftColor = texture2D(inputImageTexture, lowerLeftInputTextureCoordinate);
+     vec4 lowerRightColor = texture2D(inputImageTexture, lowerRightInputTextureCoordinate);
+     
+     gl_FragColor = 0.25 * (upperLeftColor + upperRightColor + lowerLeftColor + lowerRightColor);
+ }
+);
+#endif
+
+@implementation GPUImageAverageColor
+
+@synthesize colorAverageProcessingFinishedBlock = _colorAverageProcessingFinishedBlock;
+
+#pragma mark -
+#pragma mark Initialization and teardown
+
+- (id)init;
+{
+    if (!(self = [super initWithVertexShaderFromString:kGPUImageColorAveragingVertexShaderString fragmentShaderFromString:kGPUImageColorAveragingFragmentShaderString]))
+    {
+        return nil;
+    }
+    
+    texelWidthUniform = [filterProgram uniformIndex:@"texelWidth"];
+    texelHeightUniform = [filterProgram uniformIndex:@"texelHeight"];
+    finalStageSize = CGSizeMake(1.0, 1.0);
+    
+    __unsafe_unretained GPUImageAverageColor *weakSelf = self;
+    [self setFrameProcessingCompletionBlock:^(GPUImageOutput *filter, CMTime frameTime) {
+        [weakSelf extractAverageColorAtFrameTime:frameTime];
+    }];
+
+    return self;
+}
+
+- (void)dealloc;
+{
+    if (rawImagePixels != NULL)
+    {
+        free(rawImagePixels);
+    }
+}
+
+#pragma mark -
+#pragma mark Managing the display FBOs
+
+- (void)renderToTextureWithVertices:(const GLfloat *)vertices textureCoordinates:(const GLfloat *)textureCoordinates;
+{
+    if (self.preventRendering)
+    {
+        [firstInputFramebuffer unlock];
+        return;
+    }
+    
+    outputFramebuffer = nil;
+    [GPUImageContext setActiveShaderProgram:filterProgram];
+
+    glVertexAttribPointer(filterPositionAttribute, 2, GL_FLOAT, 0, 0, vertices);
+    glVertexAttribPointer(filterTextureCoordinateAttribute, 2, GL_FLOAT, 0, 0, textureCoordinates);
+
+    GLuint currentTexture = [firstInputFramebuffer texture];
+    
+    NSUInteger numberOfReductionsInX = floor(log(inputTextureSize.width) / log(4.0));
+    NSUInteger numberOfReductionsInY = floor(log(inputTextureSize.height) / log(4.0));
+    NSUInteger reductionsToHitSideLimit = MIN(numberOfReductionsInX, numberOfReductionsInY);
+    for (NSUInteger currentReduction = 0; currentReduction < reductionsToHitSideLimit; currentReduction++)
+    {
+        CGSize currentStageSize = CGSizeMake(floor(inputTextureSize.width / pow(4.0, currentReduction + 1.0)), floor(inputTextureSize.height / pow(4.0, currentReduction + 1.0)));
+
+        [outputFramebuffer unlock];
+        outputFramebuffer = [[GPUImageContext sharedFramebufferCache] fetchFramebufferForSize:currentStageSize textureOptions:self.outputTextureOptions onlyTexture:NO];
+        [outputFramebuffer activateFramebuffer];
+
+        glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
+        glClear(GL_COLOR_BUFFER_BIT);
+        
+        glActiveTexture(GL_TEXTURE2);
+        glBindTexture(GL_TEXTURE_2D, currentTexture);
+        
+        glUniform1i(filterInputTextureUniform, 2);
+        
+        glUniform1f(texelWidthUniform, 0.25 / currentStageSize.width);
+        glUniform1f(texelHeightUniform, 0.25 / currentStageSize.height);
+        
+        glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
+
+        currentTexture = [outputFramebuffer texture];
+        finalStageSize = currentStageSize;
+    }
+
+    [firstInputFramebuffer unlock];
+}
+
+- (void)setInputRotation:(GPUImageRotationMode)newInputRotation atIndex:(NSInteger)textureIndex;
+{
+    inputRotation = kGPUImageNoRotation;
+}
+
+- (void)extractAverageColorAtFrameTime:(CMTime)frameTime;
+{
+    runSynchronouslyOnVideoProcessingQueue(^{
+        // we need a normal color texture for averaging the color values
+        NSAssert(self.outputTextureOptions.internalFormat == GL_RGBA, @"The output texture internal format for this filter must be GL_RGBA.");
+        NSAssert(self.outputTextureOptions.type == GL_UNSIGNED_BYTE, @"The type of the output texture of this filter must be GL_UNSIGNED_BYTE.");
+        
+        NSUInteger totalNumberOfPixels = round(finalStageSize.width * finalStageSize.height);
+        
+        if (rawImagePixels == NULL)
+        {
+            rawImagePixels = (GLubyte *)malloc(totalNumberOfPixels * 4);
+        }
+        
+        [GPUImageContext useImageProcessingContext];
+        [outputFramebuffer activateFramebuffer];
+        glReadPixels(0, 0, (int)finalStageSize.width, (int)finalStageSize.height, GL_RGBA, GL_UNSIGNED_BYTE, rawImagePixels);
+        
+        NSUInteger redTotal = 0, greenTotal = 0, blueTotal = 0, alphaTotal = 0;
+        NSUInteger byteIndex = 0;
+        for (NSUInteger currentPixel = 0; currentPixel < totalNumberOfPixels; currentPixel++)
+        {
+            redTotal += rawImagePixels[byteIndex++];
+            greenTotal += rawImagePixels[byteIndex++];
+            blueTotal += rawImagePixels[byteIndex++];
+            alphaTotal += rawImagePixels[byteIndex++];
+        }
+        
+        CGFloat normalizedRedTotal = (CGFloat)redTotal / (CGFloat)totalNumberOfPixels / 255.0;
+        CGFloat normalizedGreenTotal = (CGFloat)greenTotal / (CGFloat)totalNumberOfPixels / 255.0;
+        CGFloat normalizedBlueTotal = (CGFloat)blueTotal / (CGFloat)totalNumberOfPixels / 255.0;
+        CGFloat normalizedAlphaTotal = (CGFloat)alphaTotal / (CGFloat)totalNumberOfPixels / 255.0;
+        
+        if (_colorAverageProcessingFinishedBlock != NULL)
+        {
+            _colorAverageProcessingFinishedBlock(normalizedRedTotal, normalizedGreenTotal, normalizedBlueTotal, normalizedAlphaTotal, frameTime);
+        }
+    });
+}
+
+@end

LFLiveKit/Vendor/GPUImage/GPUImageAverageLuminanceThresholdFilter.h

@@ -0,0 +1,8 @@
+#import "GPUImageFilterGroup.h"
+
+@interface GPUImageAverageLuminanceThresholdFilter : GPUImageFilterGroup
+
+// This is multiplied by the continually calculated average image luminosity to arrive at the final threshold. Default is 1.0.
+@property(readwrite, nonatomic) CGFloat thresholdMultiplier;
+
+@end

LFLiveKit/Vendor/GPUImage/GPUImageAverageLuminanceThresholdFilter.m

@@ -0,0 +1,47 @@
+#import "GPUImageAverageLuminanceThresholdFilter.h"
+#import "GPUImageLuminosity.h"
+#import "GPUImageLuminanceThresholdFilter.h"
+
+@interface GPUImageAverageLuminanceThresholdFilter()
+{
+    GPUImageLuminosity *luminosityFilter;
+    GPUImageLuminanceThresholdFilter *luminanceThresholdFilter;
+}
+@end
+
+@implementation GPUImageAverageLuminanceThresholdFilter
+
+@synthesize thresholdMultiplier = _thresholdMultiplier;
+
+#pragma mark -
+#pragma mark Initialization and teardown
+
+- (id)init;
+{
+    if (!(self = [super init]))
+    {
+		return nil;
+    }
+    
+    self.thresholdMultiplier = 1.0;
+    
+    luminosityFilter = [[GPUImageLuminosity alloc] init];
+    [self addFilter:luminosityFilter];
+    
+    luminanceThresholdFilter = [[GPUImageLuminanceThresholdFilter alloc] init];
+    [self addFilter:luminanceThresholdFilter];
+    
+    __unsafe_unretained GPUImageAverageLuminanceThresholdFilter *weakSelf = self;
+    __unsafe_unretained GPUImageLuminanceThresholdFilter *weakThreshold = luminanceThresholdFilter;
+    
+    [luminosityFilter setLuminosityProcessingFinishedBlock:^(CGFloat luminosity, CMTime frameTime) {
+        weakThreshold.threshold = luminosity * weakSelf.thresholdMultiplier;
+    }];
+    
+    self.initialFilters = [NSArray arrayWithObjects:luminosityFilter, luminanceThresholdFilter, nil];
+    self.terminalFilter = luminanceThresholdFilter;
+    
+    return self;
+}
+
+@end

LFLiveKit/Vendor/GPUImage/GPUImageBilateralFilter.h

@@ -0,0 +1,10 @@
+#import "GPUImageGaussianBlurFilter.h"
+
+@interface GPUImageBilateralFilter : GPUImageGaussianBlurFilter
+{
+    CGFloat firstDistanceNormalizationFactorUniform;
+    CGFloat secondDistanceNormalizationFactorUniform;
+}
+// A normalization factor for the distance between central color and sample color.
+@property(nonatomic, readwrite) CGFloat distanceNormalizationFactor;
+@end

LFLiveKit/Vendor/GPUImage/GPUImageBilateralFilter.m

@@ -0,0 +1,231 @@
+#import "GPUImageBilateralFilter.h"
+
+NSString *const kGPUImageBilateralBlurVertexShaderString = SHADER_STRING
+(
+ attribute vec4 position;
+ attribute vec4 inputTextureCoordinate;
+ 
+ const int GAUSSIAN_SAMPLES = 9;
+ 
+ uniform float texelWidthOffset;
+ uniform float texelHeightOffset;
+ 
+ varying vec2 textureCoordinate;
+ varying vec2 blurCoordinates[GAUSSIAN_SAMPLES];
+ 
+ void main()
+ {
+     gl_Position = position;
+     textureCoordinate = inputTextureCoordinate.xy;
+     
+     // Calculate the positions for the blur
+     int multiplier = 0;
+     vec2 blurStep;
+     vec2 singleStepOffset = vec2(texelWidthOffset, texelHeightOffset);
+     
+     for (int i = 0; i < GAUSSIAN_SAMPLES; i++)
+     {
+         multiplier = (i - ((GAUSSIAN_SAMPLES - 1) / 2));
+         // Blur in x (horizontal)
+         blurStep = float(multiplier) * singleStepOffset;
+         blurCoordinates[i] = inputTextureCoordinate.xy + blurStep;
+     }
+ }
+);
+
+#if TARGET_IPHONE_SIMULATOR || TARGET_OS_IPHONE
+NSString *const kGPUImageBilateralFilterFragmentShaderString = SHADER_STRING
+(
+ uniform sampler2D inputImageTexture;
+ 
+ const lowp int GAUSSIAN_SAMPLES = 9;
+ 
+ varying highp vec2 textureCoordinate;
+ varying highp vec2 blurCoordinates[GAUSSIAN_SAMPLES];
+ 
+ uniform mediump float distanceNormalizationFactor;
+ 
+ void main()
+ {
+     lowp vec4 centralColor;
+     lowp float gaussianWeightTotal;
+     lowp vec4 sum;
+     lowp vec4 sampleColor;
+     lowp float distanceFromCentralColor;
+     lowp float gaussianWeight;
+     
+     centralColor = texture2D(inputImageTexture, blurCoordinates[4]);
+     gaussianWeightTotal = 0.18;
+     sum = centralColor * 0.18;
+     
+     sampleColor = texture2D(inputImageTexture, blurCoordinates[0]);
+     distanceFromCentralColor = min(distance(centralColor, sampleColor) * distanceNormalizationFactor, 1.0);
+     gaussianWeight = 0.05 * (1.0 - distanceFromCentralColor);
+     gaussianWeightTotal += gaussianWeight;
+     sum += sampleColor * gaussianWeight;
+
+     sampleColor = texture2D(inputImageTexture, blurCoordinates[1]);
+     distanceFromCentralColor = min(distance(centralColor, sampleColor) * distanceNormalizationFactor, 1.0);
+     gaussianWeight = 0.09 * (1.0 - distanceFromCentralColor);
+     gaussianWeightTotal += gaussianWeight;
+     sum += sampleColor * gaussianWeight;
+
+     sampleColor = texture2D(inputImageTexture, blurCoordinates[2]);
+     distanceFromCentralColor = min(distance(centralColor, sampleColor) * distanceNormalizationFactor, 1.0);
+     gaussianWeight = 0.12 * (1.0 - distanceFromCentralColor);
+     gaussianWeightTotal += gaussianWeight;
+     sum += sampleColor * gaussianWeight;
+
+     sampleColor = texture2D(inputImageTexture, blurCoordinates[3]);
+     distanceFromCentralColor = min(distance(centralColor, sampleColor) * distanceNormalizationFactor, 1.0);
+     gaussianWeight = 0.15 * (1.0 - distanceFromCentralColor);
+     gaussianWeightTotal += gaussianWeight;
+     sum += sampleColor * gaussianWeight;
+
+     sampleColor = texture2D(inputImageTexture, blurCoordinates[5]);
+     distanceFromCentralColor = min(distance(centralColor, sampleColor) * distanceNormalizationFactor, 1.0);
+     gaussianWeight = 0.15 * (1.0 - distanceFromCentralColor);
+     gaussianWeightTotal += gaussianWeight;
+     sum += sampleColor * gaussianWeight;
+
+     sampleColor = texture2D(inputImageTexture, blurCoordinates[6]);
+     distanceFromCentralColor = min(distance(centralColor, sampleColor) * distanceNormalizationFactor, 1.0);
+     gaussianWeight = 0.12 * (1.0 - distanceFromCentralColor);
+     gaussianWeightTotal += gaussianWeight;
+     sum += sampleColor * gaussianWeight;
+
+     sampleColor = texture2D(inputImageTexture, blurCoordinates[7]);
+     distanceFromCentralColor = min(distance(centralColor, sampleColor) * distanceNormalizationFactor, 1.0);
+     gaussianWeight = 0.09 * (1.0 - distanceFromCentralColor);
+     gaussianWeightTotal += gaussianWeight;
+     sum += sampleColor * gaussianWeight;
+
+     sampleColor = texture2D(inputImageTexture, blurCoordinates[8]);
+     distanceFromCentralColor = min(distance(centralColor, sampleColor) * distanceNormalizationFactor, 1.0);
+     gaussianWeight = 0.05 * (1.0 - distanceFromCentralColor);
+     gaussianWeightTotal += gaussianWeight;
+     sum += sampleColor * gaussianWeight;
+     
+     gl_FragColor = sum / gaussianWeightTotal;
+ }
+);
+#else
+NSString *const kGPUImageBilateralFilterFragmentShaderString = SHADER_STRING
+(
+ uniform sampler2D inputImageTexture;
+ 
+ const int GAUSSIAN_SAMPLES = 9;
+ 
+ varying vec2 textureCoordinate;
+ varying vec2 blurCoordinates[GAUSSIAN_SAMPLES];
+ 
+ uniform float distanceNormalizationFactor;
+ 
+ void main()
+ {
+     vec4 centralColor;
+     float gaussianWeightTotal;
+     vec4 sum;
+     vec4 sampleColor;
+     float distanceFromCentralColor;
+     float gaussianWeight;
+     
+     centralColor = texture2D(inputImageTexture, blurCoordinates[4]);
+     gaussianWeightTotal = 0.18;
+     sum = centralColor * 0.18;
+     
+     sampleColor = texture2D(inputImageTexture, blurCoordinates[0]);
+     distanceFromCentralColor = min(distance(centralColor, sampleColor) * distanceNormalizationFactor, 1.0);
+     gaussianWeight = 0.05 * (1.0 - distanceFromCentralColor);
+     gaussianWeightTotal += gaussianWeight;
+     sum += sampleColor * gaussianWeight;
+     
+     sampleColor = texture2D(inputImageTexture, blurCoordinates[1]);
+     distanceFromCentralColor = min(distance(centralColor, sampleColor) * distanceNormalizationFactor, 1.0);
+     gaussianWeight = 0.09 * (1.0 - distanceFromCentralColor);
+     gaussianWeightTotal += gaussianWeight;
+     sum += sampleColor * gaussianWeight;
+     
+     sampleColor = texture2D(inputImageTexture, blurCoordinates[2]);
+     distanceFromCentralColor = min(distance(centralColor, sampleColor) * distanceNormalizationFactor, 1.0);
+     gaussianWeight = 0.12 * (1.0 - distanceFromCentralColor);
+     gaussianWeightTotal += gaussianWeight;
+     sum += sampleColor * gaussianWeight;
+     
+     sampleColor = texture2D(inputImageTexture, blurCoordinates[3]);
+     distanceFromCentralColor = min(distance(centralColor, sampleColor) * distanceNormalizationFactor, 1.0);
+     gaussianWeight = 0.15 * (1.0 - distanceFromCentralColor);
+     gaussianWeightTotal += gaussianWeight;
+     sum += sampleColor * gaussianWeight;
+     
+     sampleColor = texture2D(inputImageTexture, blurCoordinates[5]);
+     distanceFromCentralColor = min(distance(centralColor, sampleColor) * distanceNormalizationFactor, 1.0);
+     gaussianWeight = 0.15 * (1.0 - distanceFromCentralColor);
+     gaussianWeightTotal += gaussianWeight;
+     sum += sampleColor * gaussianWeight;
+     
+     sampleColor = texture2D(inputImageTexture, blurCoordinates[6]);
+     distanceFromCentralColor = min(distance(centralColor, sampleColor) * distanceNormalizationFactor, 1.0);
+     gaussianWeight = 0.12 * (1.0 - distanceFromCentralColor);
+     gaussianWeightTotal += gaussianWeight;
+     sum += sampleColor * gaussianWeight;
+     
+     sampleColor = texture2D(inputImageTexture, blurCoordinates[7]);
+     distanceFromCentralColor = min(distance(centralColor, sampleColor) * distanceNormalizationFactor, 1.0);
+     gaussianWeight = 0.09 * (1.0 - distanceFromCentralColor);
+     gaussianWeightTotal += gaussianWeight;
+     sum += sampleColor * gaussianWeight;
+     
+     sampleColor = texture2D(inputImageTexture, blurCoordinates[8]);
+     distanceFromCentralColor = min(distance(centralColor, sampleColor) * distanceNormalizationFactor, 1.0);
+     gaussianWeight = 0.05 * (1.0 - distanceFromCentralColor);
+     gaussianWeightTotal += gaussianWeight;
+     sum += sampleColor * gaussianWeight;
+     
+     gl_FragColor = sum / gaussianWeightTotal;
+ }
+);
+#endif
+
+@implementation GPUImageBilateralFilter
+
+@synthesize distanceNormalizationFactor = _distanceNormalizationFactor;
+
+- (id)init;
+{
+    
+    if (!(self = [super initWithFirstStageVertexShaderFromString:kGPUImageBilateralBlurVertexShaderString
+                              firstStageFragmentShaderFromString:kGPUImageBilateralFilterFragmentShaderString
+                               secondStageVertexShaderFromString:kGPUImageBilateralBlurVertexShaderString
+                             secondStageFragmentShaderFromString:kGPUImageBilateralFilterFragmentShaderString])) {
+        return nil;
+    }
+    
+    firstDistanceNormalizationFactorUniform  = [filterProgram uniformIndex:@"distanceNormalizationFactor"];
+    secondDistanceNormalizationFactorUniform = [filterProgram uniformIndex:@"distanceNormalizationFactor"];
+
+    self.texelSpacingMultiplier = 4.0;
+    self.distanceNormalizationFactor = 8.0;
+
+    
+    return self;
+}
+
+
+#pragma mark -
+#pragma mark Accessors
+
+- (void)setDistanceNormalizationFactor:(CGFloat)newValue
+{
+    _distanceNormalizationFactor = newValue;
+    
+    [self setFloat:newValue
+        forUniform:firstDistanceNormalizationFactorUniform
+           program:filterProgram];
+    
+    [self setFloat:newValue
+        forUniform:secondDistanceNormalizationFactorUniform
+           program:secondFilterProgram];
+}
+
+@end

LFLiveKit/Vendor/GPUImage/GPUImageBoxBlurFilter.h

@@ -0,0 +1,7 @@
+#import "GPUImageGaussianBlurFilter.h"
+
+/** A hardware-accelerated box blur of an image
+ */
+@interface GPUImageBoxBlurFilter : GPUImageGaussianBlurFilter
+
+@end

LFLiveKit/Vendor/GPUImage/GPUImageBoxBlurFilter.m

@@ -0,0 +1,178 @@
+#import "GPUImageBoxBlurFilter.h"
+
+
+@implementation GPUImageBoxBlurFilter
+
++ (NSString *)vertexShaderForOptimizedBlurOfRadius:(NSUInteger)blurRadius sigma:(CGFloat)sigma;
+{
+    if (blurRadius < 1)
+    {
+        return kGPUImageVertexShaderString;
+    }
+
+    // From these weights we calculate the offsets to read interpolated values from
+    NSUInteger numberOfOptimizedOffsets = MIN(blurRadius / 2 + (blurRadius % 2), 7);
+    
+    NSMutableString *shaderString = [[NSMutableString alloc] init];
+    // Header
+    [shaderString appendFormat:@"\
+     attribute vec4 position;\n\
+     attribute vec4 inputTextureCoordinate;\n\
+     \n\
+     uniform float texelWidthOffset;\n\
+     uniform float texelHeightOffset;\n\
+     \n\
+     varying vec2 blurCoordinates[%lu];\n\
+     \n\
+     void main()\n\
+     {\n\
+     gl_Position = position;\n\
+     \n\
+     vec2 singleStepOffset = vec2(texelWidthOffset, texelHeightOffset);\n", (unsigned long)(1 + (numberOfOptimizedOffsets * 2))];
+    
+    // Inner offset loop
+    [shaderString appendString:@"blurCoordinates[0] = inputTextureCoordinate.xy;\n"];
+    for (NSUInteger currentOptimizedOffset = 0; currentOptimizedOffset < numberOfOptimizedOffsets; currentOptimizedOffset++)
+    {
+        GLfloat optimizedOffset = (GLfloat)(currentOptimizedOffset * 2) + 1.5;
+        
+        [shaderString appendFormat:@"\
+         blurCoordinates[%lu] = inputTextureCoordinate.xy + singleStepOffset * %f;\n\
+         blurCoordinates[%lu] = inputTextureCoordinate.xy - singleStepOffset * %f;\n", (unsigned long)((currentOptimizedOffset * 2) + 1), optimizedOffset, (unsigned long)((currentOptimizedOffset * 2) + 2), optimizedOffset];
+    }
+    
+    // Footer
+    [shaderString appendString:@"}\n"];
+
+    return shaderString;
+}
+
++ (NSString *)fragmentShaderForOptimizedBlurOfRadius:(NSUInteger)blurRadius sigma:(CGFloat)sigma;
+{
+    if (blurRadius < 1)
+    {
+        return kGPUImagePassthroughFragmentShaderString;
+    }
+
+    NSUInteger numberOfOptimizedOffsets = MIN(blurRadius / 2 + (blurRadius % 2), 7);
+    NSUInteger trueNumberOfOptimizedOffsets = blurRadius / 2 + (blurRadius % 2);
+    
+    NSMutableString *shaderString = [[NSMutableString alloc] init];
+    
+    // Header
+#if TARGET_IPHONE_SIMULATOR || TARGET_OS_IPHONE
+    [shaderString appendFormat:@"\
+     uniform sampler2D inputImageTexture;\n\
+     uniform highp float texelWidthOffset;\n\
+     uniform highp float texelHeightOffset;\n\
+     \n\
+     varying highp vec2 blurCoordinates[%lu];\n\
+     \n\
+     void main()\n\
+     {\n\
+     lowp vec4 sum = vec4(0.0);\n", (unsigned long)(1 + (numberOfOptimizedOffsets * 2)) ];
+#else
+    [shaderString appendFormat:@"\
+     uniform sampler2D inputImageTexture;\n\
+     uniform float texelWidthOffset;\n\
+     uniform float texelHeightOffset;\n\
+     \n\
+     varying vec2 blurCoordinates[%lu];\n\
+     \n\
+     void main()\n\
+     {\n\
+     vec4 sum = vec4(0.0);\n", 1 + (numberOfOptimizedOffsets * 2) ];
+#endif
+    
+    GLfloat boxWeight = 1.0 / (GLfloat)((blurRadius * 2) + 1);
+    
+    // Inner texture loop
+    [shaderString appendFormat:@"sum += texture2D(inputImageTexture, blurCoordinates[0]) * %f;\n", boxWeight];
+    
+    for (NSUInteger currentBlurCoordinateIndex = 0; currentBlurCoordinateIndex < numberOfOptimizedOffsets; currentBlurCoordinateIndex++)
+    {
+        [shaderString appendFormat:@"sum += texture2D(inputImageTexture, blurCoordinates[%lu]) * %f;\n", (unsigned long)((currentBlurCoordinateIndex * 2) + 1), boxWeight * 2.0];
+        [shaderString appendFormat:@"sum += texture2D(inputImageTexture, blurCoordinates[%lu]) * %f;\n", (unsigned long)((currentBlurCoordinateIndex * 2) + 2), boxWeight * 2.0];
+    }
+    
+    // If the number of required samples exceeds the amount we can pass in via varyings, we have to do dependent texture reads in the fragment shader
+    if (trueNumberOfOptimizedOffsets > numberOfOptimizedOffsets)
+    {
+#if TARGET_IPHONE_SIMULATOR || TARGET_OS_IPHONE
+        [shaderString appendString:@"highp vec2 singleStepOffset = vec2(texelWidthOffset, texelHeightOffset);\n"];
+#else
+        [shaderString appendString:@"vec2 singleStepOffset = vec2(texelWidthOffset, texelHeightOffset);\n"];
+#endif
+        
+        for (NSUInteger currentOverlowTextureRead = numberOfOptimizedOffsets; currentOverlowTextureRead < trueNumberOfOptimizedOffsets; currentOverlowTextureRead++)
+        {
+            GLfloat optimizedOffset = (GLfloat)(currentOverlowTextureRead * 2) + 1.5;
+            
+            [shaderString appendFormat:@"sum += texture2D(inputImageTexture, blurCoordinates[0] + singleStepOffset * %f) * %f;\n", optimizedOffset, boxWeight * 2.0];
+            [shaderString appendFormat:@"sum += texture2D(inputImageTexture, blurCoordinates[0] - singleStepOffset * %f) * %f;\n", optimizedOffset, boxWeight * 2.0];
+        }
+    }
+    
+    // Footer
+    [shaderString appendString:@"\
+     gl_FragColor = sum;\n\
+     }\n"];
+    
+    return shaderString;
+}
+
+- (void)setupFilterForSize:(CGSize)filterFrameSize;
+{
+    [super setupFilterForSize:filterFrameSize];
+    
+    if (shouldResizeBlurRadiusWithImageSize == YES)
+    {
+        
+    }
+}
+
+#pragma mark -
+#pragma mark Initialization and teardown
+
+- (id)init;
+{
+    //    NSString *currentGaussianBlurVertexShader = [GPUImageGaussianBlurFilter vertexShaderForStandardGaussianOfRadius:4 sigma:2.0];
+    //    NSString *currentGaussianBlurFragmentShader = [GPUImageGaussianBlurFilter fragmentShaderForStandardGaussianOfRadius:4 sigma:2.0];
+    
+    NSString *currentBoxBlurVertexShader = [[self class] vertexShaderForOptimizedBlurOfRadius:4 sigma:0.0];
+    NSString *currentBoxBlurFragmentShader = [[self class] fragmentShaderForOptimizedBlurOfRadius:4 sigma:0.0];
+    
+    if (!(self = [super initWithFirstStageVertexShaderFromString:currentBoxBlurVertexShader firstStageFragmentShaderFromString:currentBoxBlurFragmentShader secondStageVertexShaderFromString:currentBoxBlurVertexShader secondStageFragmentShaderFromString:currentBoxBlurFragmentShader]))
+    {
+        return nil;
+    }
+    
+    _blurRadiusInPixels = 4.0;
+    
+    return self;
+}
+
+#pragma mark -
+#pragma mark Accessors
+
+- (void)setBlurRadiusInPixels:(CGFloat)newValue;
+{
+    CGFloat newBlurRadius = round(round(newValue / 2.0) * 2.0); // For now, only do even radii
+    
+    if (newBlurRadius != _blurRadiusInPixels)
+    {
+        _blurRadiusInPixels = newBlurRadius;
+        
+        NSString *newGaussianBlurVertexShader = [[self class] vertexShaderForOptimizedBlurOfRadius:_blurRadiusInPixels sigma:0.0];
+        NSString *newGaussianBlurFragmentShader = [[self class] fragmentShaderForOptimizedBlurOfRadius:_blurRadiusInPixels sigma:0.0];
+        
+        //        NSLog(@"Optimized vertex shader: \n%@", newGaussianBlurVertexShader);
+        //        NSLog(@"Optimized fragment shader: \n%@", newGaussianBlurFragmentShader);
+        //
+        [self switchToVertexShader:newGaussianBlurVertexShader fragmentShader:newGaussianBlurFragmentShader];
+    }
+    shouldResizeBlurRadiusWithImageSize = NO;
+}
+
+@end
+

LFLiveKit/Vendor/GPUImage/GPUImageBrightnessFilter.h

@@ -0,0 +1,11 @@
+#import "GPUImageFilter.h"
+
+@interface GPUImageBrightnessFilter : GPUImageFilter
+{
+    GLint brightnessUniform;
+}
+
+// Brightness ranges from -1.0 to 1.0, with 0.0 as the normal level
+@property(readwrite, nonatomic) CGFloat brightness; 
+
+@end

LFLiveKit/Vendor/GPUImage/GPUImageBrightnessFilter.m

@@ -0,0 +1,66 @@
+#import "GPUImageBrightnessFilter.h"
+
+#if TARGET_IPHONE_SIMULATOR || TARGET_OS_IPHONE
+NSString *const kGPUImageBrightnessFragmentShaderString = SHADER_STRING
+(
+ varying highp vec2 textureCoordinate;
+ 
+ uniform sampler2D inputImageTexture;
+ uniform lowp float brightness;
+ 
+ void main()
+ {
+     lowp vec4 textureColor = texture2D(inputImageTexture, textureCoordinate);
+     
+     gl_FragColor = vec4((textureColor.rgb + vec3(brightness)), textureColor.w);
+ }
+);
+#else
+NSString *const kGPUImageBrightnessFragmentShaderString = SHADER_STRING
+(
+ varying vec2 textureCoordinate;
+ 
+ uniform sampler2D inputImageTexture;
+ uniform float brightness;
+ 
+ void main()
+ {
+     vec4 textureColor = texture2D(inputImageTexture, textureCoordinate);
+     
+     gl_FragColor = vec4((textureColor.rgb + vec3(brightness)), textureColor.w);
+ }
+ );
+#endif
+
+@implementation GPUImageBrightnessFilter
+
+@synthesize brightness = _brightness;
+
+#pragma mark -
+#pragma mark Initialization and teardown
+
+- (id)init;
+{
+    if (!(self = [super initWithFragmentShaderFromString:kGPUImageBrightnessFragmentShaderString]))
+    {
+		return nil;
+    }
+    
+    brightnessUniform = [filterProgram uniformIndex:@"brightness"];
+    self.brightness = 0.0;
+    
+    return self;
+}
+
+#pragma mark -
+#pragma mark Accessors
+
+- (void)setBrightness:(CGFloat)newValue;
+{
+    _brightness = newValue;
+    
+    [self setFloat:_brightness forUniform:brightnessUniform program:filterProgram];
+}
+
+@end
+

LFLiveKit/Vendor/GPUImage/GPUImageBuffer.h

@@ -0,0 +1,10 @@
+#import "GPUImageFilter.h"
+
+@interface GPUImageBuffer : GPUImageFilter
+{
+    NSMutableArray *bufferedFramebuffers;
+}
+
+@property(readwrite, nonatomic) NSUInteger bufferSize;
+
+@end

LFLiveKit/Vendor/GPUImage/GPUImageBuffer.m

@@ -0,0 +1,112 @@
+#import "GPUImageBuffer.h"
+
+@interface GPUImageBuffer()
+
+@end
+
+@implementation GPUImageBuffer
+
+@synthesize bufferSize = _bufferSize;
+
+#pragma mark -
+#pragma mark Initialization and teardown
+
+- (id)init;
+{
+    if (!(self = [self initWithFragmentShaderFromString:kGPUImagePassthroughFragmentShaderString]))
+    {
+        return nil;
+    }
+    
+    bufferedFramebuffers = [[NSMutableArray alloc] init];
+//    [bufferedTextures addObject:[NSNumber numberWithInt:outputTexture]];
+    _bufferSize = 1;
+    
+    return self;
+}
+
+- (void)dealloc
+{
+    for (GPUImageFramebuffer *currentFramebuffer in bufferedFramebuffers)
+    {
+        [currentFramebuffer unlock];
+    }
+}
+
+#pragma mark -
+#pragma mark GPUImageInput
+
+- (void)newFrameReadyAtTime:(CMTime)frameTime atIndex:(NSInteger)textureIndex;
+{
+    if ([bufferedFramebuffers count] >= _bufferSize)
+    {
+        outputFramebuffer = [bufferedFramebuffers objectAtIndex:0];
+        [bufferedFramebuffers removeObjectAtIndex:0];
+    }
+    else
+    {
+        // Nothing yet in the buffer, so don't process further until the buffer is full
+        outputFramebuffer = firstInputFramebuffer;
+        [firstInputFramebuffer lock];
+    }
+    
+    [bufferedFramebuffers addObject:firstInputFramebuffer];
+
+    // Need to pass along rotation information, as we're just holding on to buffered framebuffers and not rotating them ourselves
+    for (id<GPUImageInput> currentTarget in targets)
+    {
+        if (currentTarget != self.targetToIgnoreForUpdates)
+        {
+            NSInteger indexOfObject = [targets indexOfObject:currentTarget];
+            NSInteger textureIndex = [[targetTextureIndices objectAtIndex:indexOfObject] integerValue];
+            
+            [currentTarget setInputRotation:inputRotation atIndex:textureIndex];
+        }
+    }
+
+    // Let the downstream video elements see the previous frame from the buffer before rendering a new one into place
+    [self informTargetsAboutNewFrameAtTime:frameTime];
+ 
+//    [self renderToTextureWithVertices:imageVertices textureCoordinates:[[self class] textureCoordinatesForRotation:inputRotation]];
+}
+
+- (void)renderToTextureWithVertices:(const GLfloat *)vertices textureCoordinates:(const GLfloat *)textureCoordinates;
+{
+    // No need to render to another texture anymore, since we'll be hanging on to the textures in our buffer
+}
+
+#pragma mark -
+#pragma mark Accessors
+
+- (void)setBufferSize:(NSUInteger)newValue;
+{
+    if ( (newValue == _bufferSize) || (newValue < 1) )
+    {
+        return;
+    }
+        
+    if (newValue > _bufferSize)
+    {
+        NSUInteger texturesToAdd = newValue - _bufferSize;
+        for (NSUInteger currentTextureIndex = 0; currentTextureIndex < texturesToAdd; currentTextureIndex++)
+        {
+            // TODO: Deal with the growth of the size of the buffer by rotating framebuffers, no textures
+        }
+    }
+    else
+    {
+        NSUInteger texturesToRemove = _bufferSize - newValue;
+        for (NSUInteger currentTextureIndex = 0; currentTextureIndex < texturesToRemove; currentTextureIndex++)
+        {
+            GPUImageFramebuffer *lastFramebuffer = [bufferedFramebuffers lastObject];
+            [bufferedFramebuffers removeObjectAtIndex:([bufferedFramebuffers count] - 1)];
+            
+            [lastFramebuffer unlock];
+            lastFramebuffer = nil;
+        }
+    }
+
+  _bufferSize = newValue;
+}
+
+@end

LFLiveKit/Vendor/GPUImage/GPUImageBulgeDistortionFilter.h

@@ -0,0 +1,16 @@
+#import "GPUImageFilter.h"
+
+/// Creates a bulge distortion on the image
+@interface GPUImageBulgeDistortionFilter : GPUImageFilter
+{
+    GLint aspectRatioUniform, radiusUniform, centerUniform, scaleUniform;
+}
+
+/// The center about which to apply the distortion, with a default of (0.5, 0.5)
+@property(readwrite, nonatomic) CGPoint center;
+/// The radius of the distortion, ranging from 0.0 to 1.0, with a default of 0.25
+@property(readwrite, nonatomic) CGFloat radius;
+/// The amount of distortion to apply, from -1.0 to 1.0, with a default of 0.5
+@property(readwrite, nonatomic) CGFloat scale;
+
+@end

LFLiveKit/Vendor/GPUImage/GPUImageBulgeDistortionFilter.m

@@ -0,0 +1,174 @@
+#import "GPUImageBulgeDistortionFilter.h"
+
+#if TARGET_IPHONE_SIMULATOR || TARGET_OS_IPHONE
+NSString *const kGPUImageBulgeDistortionFragmentShaderString = SHADER_STRING
+(
+ varying highp vec2 textureCoordinate;
+ 
+ uniform sampler2D inputImageTexture;
+ 
+ uniform highp float aspectRatio;
+ uniform highp vec2 center;
+ uniform highp float radius;
+ uniform highp float scale;
+
+ void main()
+ {
+    highp vec2 textureCoordinateToUse = vec2(textureCoordinate.x, ((textureCoordinate.y - center.y) * aspectRatio) + center.y);
+    highp float dist = distance(center, textureCoordinateToUse);
+    textureCoordinateToUse = textureCoordinate;
+    
+    if (dist < radius)
+    {
+        textureCoordinateToUse -= center;
+        highp float percent = 1.0 - ((radius - dist) / radius) * scale;
+        percent = percent * percent;
+        
+        textureCoordinateToUse = textureCoordinateToUse * percent;
+        textureCoordinateToUse += center;
+    }
+    
+    gl_FragColor = texture2D(inputImageTexture, textureCoordinateToUse );    
+ }
+);
+#else
+NSString *const kGPUImageBulgeDistortionFragmentShaderString = SHADER_STRING
+(
+ varying vec2 textureCoordinate;
+ 
+ uniform sampler2D inputImageTexture;
+ 
+ uniform float aspectRatio;
+ uniform vec2 center;
+ uniform float radius;
+ uniform float scale;
+ 
+ void main()
+ {
+    vec2 textureCoordinateToUse = vec2(textureCoordinate.x, ((textureCoordinate.y - center.y) * aspectRatio) + center.y);
+    float dist = distance(center, textureCoordinateToUse);
+    textureCoordinateToUse = textureCoordinate;
+    
+    if (dist < radius)
+    {
+        textureCoordinateToUse -= center;
+        float percent = 1.0 - ((radius - dist) / radius) * scale;
+        percent = percent * percent;
+        
+        textureCoordinateToUse = textureCoordinateToUse * percent;
+        textureCoordinateToUse += center;
+    }
+    
+    gl_FragColor = texture2D(inputImageTexture, textureCoordinateToUse );
+ }
+);
+#endif
+
+
+@interface GPUImageBulgeDistortionFilter ()
+
+- (void)adjustAspectRatio;
+
+@property (readwrite, nonatomic) CGFloat aspectRatio;
+
+@end
+
+@implementation GPUImageBulgeDistortionFilter
+
+@synthesize aspectRatio = _aspectRatio;
+@synthesize center = _center;
+@synthesize radius = _radius;
+@synthesize scale = _scale;
+
+#pragma mark -
+#pragma mark Initialization and teardown
+
+- (id)init;
+{
+    if (!(self = [super initWithFragmentShaderFromString:kGPUImageBulgeDistortionFragmentShaderString]))
+    {
+		return nil;
+    }
+    
+    aspectRatioUniform = [filterProgram uniformIndex:@"aspectRatio"];
+    radiusUniform = [filterProgram uniformIndex:@"radius"];
+    scaleUniform = [filterProgram uniformIndex:@"scale"];
+    centerUniform = [filterProgram uniformIndex:@"center"];
+
+    self.radius = 0.25;
+    self.scale = 0.5;
+    self.center = CGPointMake(0.5, 0.5);
+    
+    return self;
+}
+
+#pragma mark -
+#pragma mark Accessors
+
+- (void)adjustAspectRatio;
+{
+    if (GPUImageRotationSwapsWidthAndHeight(inputRotation))
+    {
+        [self setAspectRatio:(inputTextureSize.width / inputTextureSize.height)];
+    }
+    else
+    {
+        [self setAspectRatio:(inputTextureSize.height / inputTextureSize.width)];
+    }
+}
+
+- (void)forceProcessingAtSize:(CGSize)frameSize;
+{
+    [super forceProcessingAtSize:frameSize];
+    [self adjustAspectRatio];
+}
+
+- (void)setInputSize:(CGSize)newSize atIndex:(NSInteger)textureIndex;
+{
+    CGSize oldInputSize = inputTextureSize;
+    [super setInputSize:newSize atIndex:textureIndex];
+    
+    if ( (!CGSizeEqualToSize(oldInputSize, inputTextureSize)) && (!CGSizeEqualToSize(newSize, CGSizeZero)) )
+    {
+        [self adjustAspectRatio];
+    }
+}
+
+- (void)setAspectRatio:(CGFloat)newValue;
+{
+    _aspectRatio = newValue;
+    
+    [self setFloat:_aspectRatio forUniform:aspectRatioUniform program:filterProgram];
+}
+
+- (void)setInputRotation:(GPUImageRotationMode)newInputRotation atIndex:(NSInteger)textureIndex;
+{
+    [super setInputRotation:newInputRotation atIndex:textureIndex];
+    [self setCenter:self.center];
+    [self adjustAspectRatio];
+}
+
+- (void)setRadius:(CGFloat)newValue;
+{
+    _radius = newValue;
+    
+    [self setFloat:_radius forUniform:radiusUniform program:filterProgram];
+}
+
+- (void)setScale:(CGFloat)newValue;
+{
+    _scale = newValue;
+
+    [self setFloat:_scale forUniform:scaleUniform program:filterProgram];
+}
+
+- (void)setCenter:(CGPoint)newValue;
+{
+    _center = newValue;
+    
+    CGPoint rotatedPoint = [self rotatedPoint:_center forRotation:inputRotation];
+    
+    [self setPoint:rotatedPoint forUniform:centerUniform program:filterProgram];
+}
+
+@end

LFLiveKit/Vendor/GPUImage/GPUImageCGAColorspaceFilter.h

@@ -0,0 +1,5 @@
+#import "GPUImageFilter.h"
+
+@interface GPUImageCGAColorspaceFilter : GPUImageFilter
+
+@end

LFLiveKit/Vendor/GPUImage/GPUImageCGAColorspaceFilter.m

@@ -0,0 +1,113 @@
+//
+//  GPUImageCGAColorspaceFilter.m
+//
+
+#import "GPUImageCGAColorspaceFilter.h"
+
+#if TARGET_IPHONE_SIMULATOR || TARGET_OS_IPHONE
+NSString *const kGPUImageCGAColorspaceFragmentShaderString = SHADER_STRING
+(
+ varying highp vec2 textureCoordinate;
+ 
+ uniform sampler2D inputImageTexture;
+ 
+ void main()
+ {
+     highp vec2 sampleDivisor = vec2(1.0 / 200.0, 1.0 / 320.0);
+     //highp vec4 colorDivisor = vec4(colorDepth);
+     
+     highp vec2 samplePos = textureCoordinate - mod(textureCoordinate, sampleDivisor);
+     highp vec4 color = texture2D(inputImageTexture, samplePos );
+     
+     //gl_FragColor = texture2D(inputImageTexture, samplePos );
+     mediump vec4 colorCyan = vec4(85.0 / 255.0, 1.0, 1.0, 1.0);
+     mediump vec4 colorMagenta = vec4(1.0, 85.0 / 255.0, 1.0, 1.0);
+     mediump vec4 colorWhite = vec4(1.0, 1.0, 1.0, 1.0);
+     mediump vec4 colorBlack = vec4(0.0, 0.0, 0.0, 1.0);
+     
+     mediump vec4 endColor;
+     highp float blackDistance = distance(color, colorBlack);
+     highp float whiteDistance = distance(color, colorWhite);
+     highp float magentaDistance = distance(color, colorMagenta);
+     highp float cyanDistance = distance(color, colorCyan);
+     
+     mediump vec4 finalColor;
+     
+     highp float colorDistance = min(magentaDistance, cyanDistance);
+     colorDistance = min(colorDistance, whiteDistance);
+     colorDistance = min(colorDistance, blackDistance); 
+     
+     if (colorDistance == blackDistance) {
+         finalColor = colorBlack;
+     } else if (colorDistance == whiteDistance) {
+         finalColor = colorWhite;
+     } else if (colorDistance == cyanDistance) {
+         finalColor = colorCyan;
+     } else {
+         finalColor = colorMagenta;
+     }
+     
+     gl_FragColor = finalColor;
+ }
+);
+#else
+NSString *const kGPUImageCGAColorspaceFragmentShaderString = SHADER_STRING
+(
+ varying vec2 textureCoordinate;
+ 
+ uniform sampler2D inputImageTexture;
+ 
+ void main()
+ {
+     vec2 sampleDivisor = vec2(1.0 / 200.0, 1.0 / 320.0);
+     //highp vec4 colorDivisor = vec4(colorDepth);
+     
+     vec2 samplePos = textureCoordinate - mod(textureCoordinate, sampleDivisor);
+     vec4 color = texture2D(inputImageTexture, samplePos );
+     
+     //gl_FragColor = texture2D(inputImageTexture, samplePos );
+     vec4 colorCyan = vec4(85.0 / 255.0, 1.0, 1.0, 1.0);
+     vec4 colorMagenta = vec4(1.0, 85.0 / 255.0, 1.0, 1.0);
+     vec4 colorWhite = vec4(1.0, 1.0, 1.0, 1.0);
+     vec4 colorBlack = vec4(0.0, 0.0, 0.0, 1.0);
+     
+     vec4 endColor;
+     float blackDistance = distance(color, colorBlack);
+     float whiteDistance = distance(color, colorWhite);
+     float magentaDistance = distance(color, colorMagenta);
+     float cyanDistance = distance(color, colorCyan);
+     
+     vec4 finalColor;
+     
+     float colorDistance = min(magentaDistance, cyanDistance);
+     colorDistance = min(colorDistance, whiteDistance);
+     colorDistance = min(colorDistance, blackDistance);
+     
+     if (colorDistance == blackDistance) {
+         finalColor = colorBlack;
+     } else if (colorDistance == whiteDistance) {
+         finalColor = colorWhite;
+     } else if (colorDistance == cyanDistance) {
+         finalColor = colorCyan;
+     } else {
+         finalColor = colorMagenta;
+     }
+     
+     gl_FragColor = finalColor;
+ }
+);
+#endif
+
+@implementation GPUImageCGAColorspaceFilter
+
+- (id)init;
+{
+    if (!(self = [super initWithFragmentShaderFromString:kGPUImageCGAColorspaceFragmentShaderString]))
+    {
+		return nil;
+    }
+    
+    return self;
+}
+
+@end

LFLiveKit/Vendor/GPUImage/GPUImageCannyEdgeDetectionFilter.h

@@ -0,0 +1,62 @@
+#import "GPUImageFilterGroup.h"
+
+@class GPUImageGrayscaleFilter;
+@class GPUImageSingleComponentGaussianBlurFilter;
+@class GPUImageDirectionalSobelEdgeDetectionFilter;
+@class GPUImageDirectionalNonMaximumSuppressionFilter;
+@class GPUImageWeakPixelInclusionFilter;
+
+/** This applies the edge detection process described by John Canny in 
+ 
+ Canny, J., A Computational Approach To Edge Detection, IEEE Trans. Pattern Analysis and Machine Intelligence, 8(6):679–698, 1986.
+ 
+ and implemented in OpenGL ES by 
+
+ A. Ensor, S. Hall. GPU-based Image Analysis on Mobile Devices. Proceedings of Image and Vision Computing New Zealand 2011.
+
+ It starts with a conversion to luminance, followed by an accelerated 9-hit Gaussian blur. A Sobel operator is applied to obtain the overall
+ gradient strength in the blurred image, as well as the direction (in texture sampling steps) of the gradient. A non-maximum suppression filter
+ acts along the direction of the gradient, highlighting strong edges that pass the threshold and completely removing those that fail the lower 
+ threshold. Finally, pixels from in-between these thresholds are either included in edges or rejected based on neighboring pixels.
+ */
+@interface GPUImageCannyEdgeDetectionFilter : GPUImageFilterGroup
+{
+    GPUImageGrayscaleFilter *luminanceFilter;
+    GPUImageSingleComponentGaussianBlurFilter *blurFilter;
+    GPUImageDirectionalSobelEdgeDetectionFilter *edgeDetectionFilter;
+    GPUImageDirectionalNonMaximumSuppressionFilter *nonMaximumSuppressionFilter;
+    GPUImageWeakPixelInclusionFilter *weakPixelInclusionFilter;
+}
+
+/** The image width and height factors tweak the appearance of the edges.
+ 
+ These parameters affect the visibility of the detected edges
+ 
+ By default, they match the inverse of the filter size in pixels
+ */
+@property(readwrite, nonatomic) CGFloat texelWidth; 
+/** The image width and height factors tweak the appearance of the edges.
+ 
+ These parameters affect the visibility of the detected edges
+ 
+ By default, they match the inverse of the filter size in pixels
+ */
+@property(readwrite, nonatomic) CGFloat texelHeight; 
+
+/** The underlying blur radius for the Gaussian blur. Default is 2.0.
+ */
+@property (readwrite, nonatomic) CGFloat blurRadiusInPixels;
+
+/** The underlying blur texel spacing multiplier. Default is 1.0.
+ */
+@property (readwrite, nonatomic) CGFloat blurTexelSpacingMultiplier;
+
+/** Any edge with a gradient magnitude above this threshold will pass and show up in the final result.
+ */
+@property(readwrite, nonatomic) CGFloat upperThreshold; 
+
+/** Any edge with a gradient magnitude below this threshold will fail and be removed from the final result.
+ */
+@property(readwrite, nonatomic) CGFloat lowerThreshold; 
+
+@end

LFLiveKit/Vendor/GPUImage/GPUImageCannyEdgeDetectionFilter.m

@@ -0,0 +1,125 @@
+#import "GPUImageCannyEdgeDetectionFilter.h"
+
+#import "GPUImageGrayscaleFilter.h"
+#import "GPUImageDirectionalSobelEdgeDetectionFilter.h"
+#import "GPUImageDirectionalNonMaximumSuppressionFilter.h"
+#import "GPUImageWeakPixelInclusionFilter.h"
+#import "GPUImageSingleComponentGaussianBlurFilter.h"
+
+@implementation GPUImageCannyEdgeDetectionFilter
+
+@synthesize upperThreshold;
+@synthesize lowerThreshold;
+@synthesize blurRadiusInPixels;
+@synthesize blurTexelSpacingMultiplier;
+@synthesize texelWidth;
+@synthesize texelHeight;
+
+- (id)init;
+{
+    if (!(self = [super init]))
+    {
+		return nil;
+    }
+    
+    // First pass: convert image to luminance
+    luminanceFilter = [[GPUImageGrayscaleFilter alloc] init];
+    [self addFilter:luminanceFilter];
+    
+    // Second pass: apply a variable Gaussian blur
+    blurFilter = [[GPUImageSingleComponentGaussianBlurFilter alloc] init];
+    [self addFilter:blurFilter];
+    
+    // Third pass: run the Sobel edge detection, with calculated gradient directions, on this blurred image
+    edgeDetectionFilter = [[GPUImageDirectionalSobelEdgeDetectionFilter alloc] init];
+    [self addFilter:edgeDetectionFilter];
+    
+    // Fourth pass: apply non-maximum suppression    
+    nonMaximumSuppressionFilter = [[GPUImageDirectionalNonMaximumSuppressionFilter alloc] init];
+    [self addFilter:nonMaximumSuppressionFilter];
+    
+    // Fifth pass: include weak pixels to complete edges
+    weakPixelInclusionFilter = [[GPUImageWeakPixelInclusionFilter alloc] init];
+    [self addFilter:weakPixelInclusionFilter];
+    
+    [luminanceFilter addTarget:blurFilter];
+    [blurFilter addTarget:edgeDetectionFilter];
+    [edgeDetectionFilter addTarget:nonMaximumSuppressionFilter];
+    [nonMaximumSuppressionFilter addTarget:weakPixelInclusionFilter];
+    
+    self.initialFilters = [NSArray arrayWithObject:luminanceFilter];
+//    self.terminalFilter = nonMaximumSuppressionFilter;
+    self.terminalFilter = weakPixelInclusionFilter;
+    
+    self.blurRadiusInPixels = 2.0;
+    self.blurTexelSpacingMultiplier = 1.0;
+    self.upperThreshold = 0.4;
+    self.lowerThreshold = 0.1;
+    
+    return self;
+}
+
+#pragma mark -
+#pragma mark Accessors
+
+- (void)setBlurRadiusInPixels:(CGFloat)newValue;
+{
+    blurFilter.blurRadiusInPixels = newValue;
+}
+
+- (CGFloat)blurRadiusInPixels;
+{
+    return blurFilter.blurRadiusInPixels;
+}
+
+- (void)setBlurTexelSpacingMultiplier:(CGFloat)newValue;
+{
+    blurFilter.texelSpacingMultiplier = newValue;
+}
+
+- (CGFloat)blurTexelSpacingMultiplier;
+{
+    return blurFilter.texelSpacingMultiplier;
+}
+
+- (void)setTexelWidth:(CGFloat)newValue;
+{
+    edgeDetectionFilter.texelWidth = newValue;
+}
+
+- (CGFloat)texelWidth;
+{
+    return edgeDetectionFilter.texelWidth;
+}
+
+- (void)setTexelHeight:(CGFloat)newValue;
+{
+    edgeDetectionFilter.texelHeight = newValue;
+}
+
+- (CGFloat)texelHeight;
+{
+    return edgeDetectionFilter.texelHeight;
+}
+
+- (void)setUpperThreshold:(CGFloat)newValue;
+{
+    nonMaximumSuppressionFilter.upperThreshold = newValue;
+}
+
+- (CGFloat)upperThreshold;
+{
+    return nonMaximumSuppressionFilter.upperThreshold;
+}
+
+- (void)setLowerThreshold:(CGFloat)newValue;
+{
+    nonMaximumSuppressionFilter.lowerThreshold = newValue;
+}
+
+- (CGFloat)lowerThreshold;
+{
+    return nonMaximumSuppressionFilter.lowerThreshold;
+}
+
+@end

LFLiveKit/Vendor/GPUImage/GPUImageChromaKeyBlendFilter.h

@@ -0,0 +1,32 @@
+#import "GPUImageTwoInputFilter.h"
+
+/** Selectively replaces a color in the first image with the second image
+ */
+@interface GPUImageChromaKeyBlendFilter : GPUImageTwoInputFilter
+{
+    GLint colorToReplaceUniform, thresholdSensitivityUniform, smoothingUniform;
+}
+
+/** The threshold sensitivity controls how similar pixels need to be colored to be replaced
+ 
+ The default value is 0.3
+ */
+@property(readwrite, nonatomic) CGFloat thresholdSensitivity;
+
+/** The degree of smoothing controls how gradually similar colors are replaced in the image
+ 
+ The default value is 0.1
+ */
+@property(readwrite, nonatomic) CGFloat smoothing;
+
+/** The color to be replaced is specified using individual red, green, and blue components (normalized to 1.0).
+ 
+ The default is green: (0.0, 1.0, 0.0).
+ 
+ @param redComponent Red component of color to be replaced
+ @param greenComponent Green component of color to be replaced
+ @param blueComponent Blue component of color to be replaced
+ */
+- (void)setColorToReplaceRed:(GLfloat)redComponent green:(GLfloat)greenComponent blue:(GLfloat)blueComponent;
+
+@end

LFLiveKit/Vendor/GPUImage/GPUImageChromaKeyBlendFilter.m

@@ -0,0 +1,117 @@
+#import "GPUImageChromaKeyBlendFilter.h"
+
+// Shader code based on Apple's CIChromaKeyFilter example: https://developer.apple.com/library/mac/#samplecode/CIChromaKeyFilter/Introduction/Intro.html
+
+#if TARGET_IPHONE_SIMULATOR || TARGET_OS_IPHONE
+NSString *const kGPUImageChromaKeyBlendFragmentShaderString = SHADER_STRING
+(
+ precision highp float;
+ 
+ varying highp vec2 textureCoordinate;
+ varying highp vec2 textureCoordinate2;
+
+ uniform float thresholdSensitivity;
+ uniform float smoothing;
+ uniform vec3 colorToReplace;
+ uniform sampler2D inputImageTexture;
+ uniform sampler2D inputImageTexture2;
+ 
+ void main()
+ {
+     vec4 textureColor = texture2D(inputImageTexture, textureCoordinate);
+     vec4 textureColor2 = texture2D(inputImageTexture2, textureCoordinate2);
+     
+     float maskY = 0.2989 * colorToReplace.r + 0.5866 * colorToReplace.g + 0.1145 * colorToReplace.b;
+     float maskCr = 0.7132 * (colorToReplace.r - maskY);
+     float maskCb = 0.5647 * (colorToReplace.b - maskY);
+     
+     float Y = 0.2989 * textureColor.r + 0.5866 * textureColor.g + 0.1145 * textureColor.b;
+     float Cr = 0.7132 * (textureColor.r - Y);
+     float Cb = 0.5647 * (textureColor.b - Y);
+     
+//     float blendValue = 1.0 - smoothstep(thresholdSensitivity - smoothing, thresholdSensitivity , abs(Cr - maskCr) + abs(Cb - maskCb));
+     float blendValue = 1.0 - smoothstep(thresholdSensitivity, thresholdSensitivity + smoothing, distance(vec2(Cr, Cb), vec2(maskCr, maskCb)));
+     gl_FragColor = mix(textureColor, textureColor2, blendValue);
+ }
+);
+#else
+NSString *const kGPUImageChromaKeyBlendFragmentShaderString = SHADER_STRING
+(
+ varying vec2 textureCoordinate;
+ varying vec2 textureCoordinate2;
+ 
+ uniform float thresholdSensitivity;
+ uniform float smoothing;
+ uniform vec3 colorToReplace;
+ uniform sampler2D inputImageTexture;
+ uniform sampler2D inputImageTexture2;
+ 
+ void main()
+ {
+     vec4 textureColor = texture2D(inputImageTexture, textureCoordinate);
+     vec4 textureColor2 = texture2D(inputImageTexture2, textureCoordinate2);
+     
+     float maskY = 0.2989 * colorToReplace.r + 0.5866 * colorToReplace.g + 0.1145 * colorToReplace.b;
+     float maskCr = 0.7132 * (colorToReplace.r - maskY);
+     float maskCb = 0.5647 * (colorToReplace.b - maskY);
+     
+     float Y = 0.2989 * textureColor.r + 0.5866 * textureColor.g + 0.1145 * textureColor.b;
+     float Cr = 0.7132 * (textureColor.r - Y);
+     float Cb = 0.5647 * (textureColor.b - Y);
+     
+     //     float blendValue = 1.0 - smoothstep(thresholdSensitivity - smoothing, thresholdSensitivity , abs(Cr - maskCr) + abs(Cb - maskCb));
+     float blendValue = 1.0 - smoothstep(thresholdSensitivity, thresholdSensitivity + smoothing, distance(vec2(Cr, Cb), vec2(maskCr, maskCb)));
+     gl_FragColor = mix(textureColor, textureColor2, blendValue);
+ }
+);
+#endif
+
+@implementation GPUImageChromaKeyBlendFilter
+
+@synthesize thresholdSensitivity = _thresholdSensitivity;
+@synthesize smoothing = _smoothing;
+
+- (id)init;
+{
+    if (!(self = [super initWithFragmentShaderFromString:kGPUImageChromaKeyBlendFragmentShaderString]))
+    {
+		return nil;
+    }
+    
+    thresholdSensitivityUniform = [filterProgram uniformIndex:@"thresholdSensitivity"];
+    smoothingUniform = [filterProgram uniformIndex:@"smoothing"];
+    colorToReplaceUniform = [filterProgram uniformIndex:@"colorToReplace"];
+    
+    self.thresholdSensitivity = 0.4;
+    self.smoothing = 0.1;
+    [self setColorToReplaceRed:0.0 green:1.0 blue:0.0];
+    
+    return self;
+}
+
+#pragma mark -
+#pragma mark Accessors
+
+- (void)setColorToReplaceRed:(GLfloat)redComponent green:(GLfloat)greenComponent blue:(GLfloat)blueComponent;
+{
+    GPUVector3 colorToReplace = {redComponent, greenComponent, blueComponent};
+    
+    [self setVec3:colorToReplace forUniform:colorToReplaceUniform program:filterProgram];
+}
+
+- (void)setThresholdSensitivity:(CGFloat)newValue;
+{
+    _thresholdSensitivity = newValue;
+
+    [self setFloat:(GLfloat)_thresholdSensitivity forUniform:thresholdSensitivityUniform program:filterProgram];
+}
+
+- (void)setSmoothing:(CGFloat)newValue;
+{
+    _smoothing = newValue;
+    
+    [self setFloat:(GLfloat)_smoothing forUniform:smoothingUniform program:filterProgram];
+}
+
+@end
+

LFLiveKit/Vendor/GPUImage/GPUImageChromaKeyFilter.h

@@ -0,0 +1,30 @@
+#import "GPUImageFilter.h"
+
+@interface GPUImageChromaKeyFilter : GPUImageFilter
+{
+    GLint colorToReplaceUniform, thresholdSensitivityUniform, smoothingUniform;
+}
+
+/** The threshold sensitivity controls how similar pixels need to be colored to be replaced
+ 
+ The default value is 0.3
+ */
+@property(readwrite, nonatomic) CGFloat thresholdSensitivity;
+
+/** The degree of smoothing controls how gradually similar colors are replaced in the image
+ 
+ The default value is 0.1
+ */
+@property(readwrite, nonatomic) CGFloat smoothing;
+
+/** The color to be replaced is specified using individual red, green, and blue components (normalized to 1.0).
+ 
+ The default is green: (0.0, 1.0, 0.0).
+ 
+ @param redComponent Red component of color to be replaced
+ @param greenComponent Green component of color to be replaced
+ @param blueComponent Blue component of color to be replaced
+ */
+- (void)setColorToReplaceRed:(GLfloat)redComponent green:(GLfloat)greenComponent blue:(GLfloat)blueComponent;
+
+@end

LFLiveKit/Vendor/GPUImage/GPUImageChromaKeyFilter.m

@@ -0,0 +1,113 @@
+#import "GPUImageChromaKeyFilter.h"
+
+// Shader code based on Apple's CIChromaKeyFilter example: https://developer.apple.com/library/mac/#samplecode/CIChromaKeyFilter/Introduction/Intro.html
+
+#if TARGET_IPHONE_SIMULATOR || TARGET_OS_IPHONE
+NSString *const kGPUImageChromaKeyFragmentShaderString = SHADER_STRING
+(
+ precision highp float;
+ 
+ varying highp vec2 textureCoordinate;
+ 
+ uniform float thresholdSensitivity;
+ uniform float smoothing;
+ uniform vec3 colorToReplace;
+ uniform sampler2D inputImageTexture;
+ uniform sampler2D inputImageTexture2;
+ 
+ void main()
+ {
+     vec4 textureColor = texture2D(inputImageTexture, textureCoordinate);
+     
+     float maskY = 0.2989 * colorToReplace.r + 0.5866 * colorToReplace.g + 0.1145 * colorToReplace.b;
+     float maskCr = 0.7132 * (colorToReplace.r - maskY);
+     float maskCb = 0.5647 * (colorToReplace.b - maskY);
+     
+     float Y = 0.2989 * textureColor.r + 0.5866 * textureColor.g + 0.1145 * textureColor.b;
+     float Cr = 0.7132 * (textureColor.r - Y);
+     float Cb = 0.5647 * (textureColor.b - Y);
+     
+     //     float blendValue = 1.0 - smoothstep(thresholdSensitivity - smoothing, thresholdSensitivity , abs(Cr - maskCr) + abs(Cb - maskCb));
+     float blendValue = smoothstep(thresholdSensitivity, thresholdSensitivity + smoothing, distance(vec2(Cr, Cb), vec2(maskCr, maskCb)));
+     gl_FragColor = vec4(textureColor.rgb, textureColor.a * blendValue);
+ }
+);
+#else
+NSString *const kGPUImageChromaKeyFragmentShaderString = SHADER_STRING
+(
+ varying vec2 textureCoordinate;
+ 
+ uniform float thresholdSensitivity;
+ uniform float smoothing;
+ uniform vec3 colorToReplace;
+ uniform sampler2D inputImageTexture;
+ uniform sampler2D inputImageTexture2;
+ 
+ void main()
+ {
+     vec4 textureColor = texture2D(inputImageTexture, textureCoordinate);
+     
+     float maskY = 0.2989 * colorToReplace.r + 0.5866 * colorToReplace.g + 0.1145 * colorToReplace.b;
+     float maskCr = 0.7132 * (colorToReplace.r - maskY);
+     float maskCb = 0.5647 * (colorToReplace.b - maskY);
+     
+     float Y = 0.2989 * textureColor.r + 0.5866 * textureColor.g + 0.1145 * textureColor.b;
+     float Cr = 0.7132 * (textureColor.r - Y);
+     float Cb = 0.5647 * (textureColor.b - Y);
+     
+     //     float blendValue = 1.0 - smoothstep(thresholdSensitivity - smoothing, thresholdSensitivity , abs(Cr - maskCr) + abs(Cb - maskCb));
+     float blendValue = smoothstep(thresholdSensitivity, thresholdSensitivity + smoothing, distance(vec2(Cr, Cb), vec2(maskCr, maskCb)));
+     gl_FragColor = vec4(textureColor.rgb, textureColor.a * blendValue);
+ }
+ );
+#endif
+
+@implementation GPUImageChromaKeyFilter
+
+@synthesize thresholdSensitivity = _thresholdSensitivity;
+@synthesize smoothing = _smoothing;
+
+- (id)init;
+{
+    if (!(self = [super initWithFragmentShaderFromString:kGPUImageChromaKeyFragmentShaderString]))
+    {
+		return nil;
+    }
+    
+    thresholdSensitivityUniform = [filterProgram uniformIndex:@"thresholdSensitivity"];
+    smoothingUniform = [filterProgram uniformIndex:@"smoothing"];
+    colorToReplaceUniform = [filterProgram uniformIndex:@"colorToReplace"];
+    
+    self.thresholdSensitivity = 0.4;
+    self.smoothing = 0.1;
+    [self setColorToReplaceRed:0.0 green:1.0 blue:0.0];
+    
+    return self;
+}
+
+#pragma mark -
+#pragma mark Accessors
+
+- (void)setColorToReplaceRed:(GLfloat)redComponent green:(GLfloat)greenComponent blue:(GLfloat)blueComponent;
+{
+    GPUVector3 colorToReplace = {redComponent, greenComponent, blueComponent};
+    
+    [self setVec3:colorToReplace forUniform:colorToReplaceUniform program:filterProgram];
+}
+
+- (void)setThresholdSensitivity:(CGFloat)newValue;
+{
+    _thresholdSensitivity = newValue;
+    
+    [self setFloat:(GLfloat)_thresholdSensitivity forUniform:thresholdSensitivityUniform program:filterProgram];
+}
+
+- (void)setSmoothing:(CGFloat)newValue;
+{
+    _smoothing = newValue;
+    
+    [self setFloat:(GLfloat)_smoothing forUniform:smoothingUniform program:filterProgram];
+}
+
+
+@end

LFLiveKit/Vendor/GPUImage/GPUImageClosingFilter.h

@@ -0,0 +1,19 @@
+#import "GPUImageFilterGroup.h"
+
+@class GPUImageErosionFilter;
+@class GPUImageDilationFilter;
+
+// A filter that first performs a dilation on the red channel of an image, followed by an erosion of the same radius. 
+// This helps to filter out smaller dark elements.
+
+@interface GPUImageClosingFilter : GPUImageFilterGroup
+{
+    GPUImageErosionFilter *erosionFilter;
+    GPUImageDilationFilter *dilationFilter;
+}
+
+@property(readwrite, nonatomic) CGFloat verticalTexelSpacing, horizontalTexelSpacing;
+
+- (id)initWithRadius:(NSUInteger)radius;
+
+@end

LFLiveKit/Vendor/GPUImage/GPUImageClosingFilter.m

@@ -0,0 +1,57 @@
+#import "GPUImageClosingFilter.h"
+#import "GPUImageErosionFilter.h"
+#import "GPUImageDilationFilter.h"
+
+@implementation GPUImageClosingFilter
+
+@synthesize verticalTexelSpacing = _verticalTexelSpacing;
+@synthesize horizontalTexelSpacing = _horizontalTexelSpacing;
+
+- (id)init;
+{
+    if (!(self = [self initWithRadius:1]))
+    {
+		return nil;
+    }
+    
+    return self;
+}
+
+- (id)initWithRadius:(NSUInteger)radius;
+{
+    if (!(self = [super init]))
+    {
+		return nil;
+    }
+    
+    // First pass: dilation
+    dilationFilter = [[GPUImageDilationFilter alloc] initWithRadius:radius];
+    [self addFilter:dilationFilter];
+    
+    // Second pass: erosion
+    erosionFilter = [[GPUImageErosionFilter alloc] initWithRadius:radius];
+    [self addFilter:erosionFilter];
+    
+    [dilationFilter addTarget:erosionFilter];
+    
+    self.initialFilters = [NSArray arrayWithObjects:dilationFilter, nil];
+    self.terminalFilter = erosionFilter;
+    
+    return self;
+}
+
+- (void)setVerticalTexelSpacing:(CGFloat)newValue;
+{
+    _verticalTexelSpacing = newValue;
+    erosionFilter.verticalTexelSpacing = newValue;
+    dilationFilter.verticalTexelSpacing = newValue;
+}
+
+- (void)setHorizontalTexelSpacing:(CGFloat)newValue;
+{
+    _horizontalTexelSpacing = newValue;
+    erosionFilter.horizontalTexelSpacing = newValue;
+    dilationFilter.horizontalTexelSpacing = newValue;
+}
+
+@end

LFLiveKit/Vendor/GPUImage/GPUImageColorBlendFilter.h

@@ -0,0 +1,5 @@
+#import "GPUImageTwoInputFilter.h"
+
+@interface GPUImageColorBlendFilter : GPUImageTwoInputFilter
+
+@end

LFLiveKit/Vendor/GPUImage/GPUImageColorBlendFilter.m

@@ -0,0 +1,113 @@
+#import "GPUImageColorBlendFilter.h"
+
+/**
+ * Color blend mode based upon pseudo code from the PDF specification.
+ */
+#if TARGET_IPHONE_SIMULATOR || TARGET_OS_IPHONE
+NSString *const kGPUImageColorBlendFragmentShaderString = SHADER_STRING
+(
+ varying highp vec2 textureCoordinate;
+ varying highp vec2 textureCoordinate2;
+ 
+ uniform sampler2D inputImageTexture;
+ uniform sampler2D inputImageTexture2;
+ 
+ highp float lum(lowp vec3 c) {
+     return dot(c, vec3(0.3, 0.59, 0.11));
+ }
+ 
+ lowp vec3 clipcolor(lowp vec3 c) {
+     highp float l = lum(c);
+     lowp float n = min(min(c.r, c.g), c.b);
+     lowp float x = max(max(c.r, c.g), c.b);
+     
+     if (n < 0.0) {
+         c.r = l + ((c.r - l) * l) / (l - n);
+         c.g = l + ((c.g - l) * l) / (l - n);
+         c.b = l + ((c.b - l) * l) / (l - n);
+     }
+     if (x > 1.0) {
+         c.r = l + ((c.r - l) * (1.0 - l)) / (x - l);
+         c.g = l + ((c.g - l) * (1.0 - l)) / (x - l);
+         c.b = l + ((c.b - l) * (1.0 - l)) / (x - l);
+     }
+     
+     return c;
+ }
+
+ lowp vec3 setlum(lowp vec3 c, highp float l) {
+     highp float d = l - lum(c);
+     c = c + vec3(d);
+     return clipcolor(c);
+ }
+ 
+ void main()
+ {
+	 highp vec4 baseColor = texture2D(inputImageTexture, textureCoordinate);
+	 highp vec4 overlayColor = texture2D(inputImageTexture2, textureCoordinate2);
+
+     gl_FragColor = vec4(baseColor.rgb * (1.0 - overlayColor.a) + setlum(overlayColor.rgb, lum(baseColor.rgb)) * overlayColor.a, baseColor.a);
+ }
+);
+#else
+NSString *const kGPUImageColorBlendFragmentShaderString = SHADER_STRING
+(
+ varying vec2 textureCoordinate;
+ varying vec2 textureCoordinate2;
+ 
+ uniform sampler2D inputImageTexture;
+ uniform sampler2D inputImageTexture2;
+ 
+ float lum(vec3 c) {
+     return dot(c, vec3(0.3, 0.59, 0.11));
+ }
+ 
+ vec3 clipcolor(vec3 c) {
+     float l = lum(c);
+     float n = min(min(c.r, c.g), c.b);
+     float x = max(max(c.r, c.g), c.b);
+     
+     if (n < 0.0) {
+         c.r = l + ((c.r - l) * l) / (l - n);
+         c.g = l + ((c.g - l) * l) / (l - n);
+         c.b = l + ((c.b - l) * l) / (l - n);
+     }
+     if (x > 1.0) {
+         c.r = l + ((c.r - l) * (1.0 - l)) / (x - l);
+         c.g = l + ((c.g - l) * (1.0 - l)) / (x - l);
+         c.b = l + ((c.b - l) * (1.0 - l)) / (x - l);
+     }
+     
+     return c;
+ }
+ 
+ vec3 setlum(vec3 c, float l) {
+     float d = l - lum(c);
+     c = c + vec3(d);
+     return clipcolor(c);
+ }
+ 
+ void main()
+ {
+	 vec4 baseColor = texture2D(inputImageTexture, textureCoordinate);
+	 vec4 overlayColor = texture2D(inputImageTexture2, textureCoordinate2);
+     
+     gl_FragColor = vec4(baseColor.rgb * (1.0 - overlayColor.a) + setlum(overlayColor.rgb, lum(baseColor.rgb)) * overlayColor.a, baseColor.a);
+ }
+);
+#endif
+
+
+@implementation GPUImageColorBlendFilter
+
+- (id)init;
+{
+    if (!(self = [super initWithFragmentShaderFromString:kGPUImageColorBlendFragmentShaderString]))
+    {
+		return nil;
+    }
+    
+    return self;
+}
+
+@end

LFLiveKit/Vendor/GPUImage/GPUImageColorBurnBlendFilter.h

@@ -0,0 +1,9 @@
+#import "GPUImageTwoInputFilter.h"
+
+/** Applies a color burn blend of two images
+ */
+@interface GPUImageColorBurnBlendFilter : GPUImageTwoInputFilter
+{
+}
+
+@end

LFLiveKit/Vendor/GPUImage/GPUImageColorBurnBlendFilter.m

@@ -0,0 +1,52 @@
+#import "GPUImageColorBurnBlendFilter.h"
+
+#if TARGET_IPHONE_SIMULATOR || TARGET_OS_IPHONE
+NSString *const kGPUImageColorBurnBlendFragmentShaderString = SHADER_STRING
+(
+ varying highp vec2 textureCoordinate;
+ varying highp vec2 textureCoordinate2;
+
+ uniform sampler2D inputImageTexture;
+ uniform sampler2D inputImageTexture2;
+ 
+ void main()
+ {
+    mediump vec4 textureColor = texture2D(inputImageTexture, textureCoordinate);
+    mediump vec4 textureColor2 = texture2D(inputImageTexture2, textureCoordinate2);
+    mediump vec4 whiteColor = vec4(1.0);
+    gl_FragColor = whiteColor - (whiteColor - textureColor) / textureColor2;
+ }
+);
+#else
+NSString *const kGPUImageColorBurnBlendFragmentShaderString = SHADER_STRING
+(
+ varying vec2 textureCoordinate;
+ varying vec2 textureCoordinate2;
+ 
+ uniform sampler2D inputImageTexture;
+ uniform sampler2D inputImageTexture2;
+ 
+ void main()
+ {
+     vec4 textureColor = texture2D(inputImageTexture, textureCoordinate);
+     vec4 textureColor2 = texture2D(inputImageTexture2, textureCoordinate2);
+     vec4 whiteColor = vec4(1.0);
+     gl_FragColor = whiteColor - (whiteColor - textureColor) / textureColor2;
+ }
+);
+#endif
+
+@implementation GPUImageColorBurnBlendFilter
+
+- (id)init;
+{
+    if (!(self = [super initWithFragmentShaderFromString:kGPUImageColorBurnBlendFragmentShaderString]))
+    {
+		return nil;
+    }
+    
+    return self;
+}
+
+@end
+

LFLiveKit/Vendor/GPUImage/GPUImageColorConversion.h

@@ -0,0 +1,12 @@
+#ifndef GPUImageColorConversion_h
+#define GPUImageColorConversion_h
+
+extern GLfloat *kColorConversion601;
+extern GLfloat *kColorConversion601FullRange;
+extern GLfloat *kColorConversion709;
+extern NSString *const kGPUImageYUVVideoRangeConversionForRGFragmentShaderString;
+extern NSString *const kGPUImageYUVFullRangeConversionForLAFragmentShaderString;
+extern NSString *const kGPUImageYUVVideoRangeConversionForLAFragmentShaderString;
+
+
+#endif /* GPUImageColorConversion_h */

LFLiveKit/Vendor/GPUImage/GPUImageColorConversion.m

@@ -0,0 +1,159 @@
+#import "GPUImageFilter.h"
+
+// Color Conversion Constants (YUV to RGB) including adjustment from 16-235/16-240 (video range)
+
+// BT.601, which is the standard for SDTV.
+GLfloat kColorConversion601Default[] = {
+    1.164,  1.164, 1.164,
+    0.0, -0.392, 2.017,
+    1.596, -0.813,   0.0,
+};
+
+// BT.601 full range (ref: http://www.equasys.de/colorconversion.html)
+GLfloat kColorConversion601FullRangeDefault[] = {
+    1.0,    1.0,    1.0,
+    0.0,    -0.343, 1.765,
+    1.4,    -0.711, 0.0,
+};
+
+// BT.709, which is the standard for HDTV.
+GLfloat kColorConversion709Default[] = {
+    1.164,  1.164, 1.164,
+    0.0, -0.213, 2.112,
+    1.793, -0.533,   0.0,
+};
+
+
+GLfloat *kColorConversion601 = kColorConversion601Default;
+GLfloat *kColorConversion601FullRange = kColorConversion601FullRangeDefault;
+GLfloat *kColorConversion709 = kColorConversion709Default;
+
+#if TARGET_IPHONE_SIMULATOR || TARGET_OS_IPHONE
+NSString *const kGPUImageYUVVideoRangeConversionForRGFragmentShaderString = SHADER_STRING
+(
+ varying highp vec2 textureCoordinate;
+ 
+ uniform sampler2D luminanceTexture;
+ uniform sampler2D chrominanceTexture;
+ uniform mediump mat3 colorConversionMatrix;
+ 
+ void main()
+ {
+     mediump vec3 yuv;
+     lowp vec3 rgb;
+     
+     yuv.x = texture2D(luminanceTexture, textureCoordinate).r;
+     yuv.yz = texture2D(chrominanceTexture, textureCoordinate).rg - vec2(0.5, 0.5);
+     rgb = colorConversionMatrix * yuv;
+     
+     gl_FragColor = vec4(rgb, 1);
+ }
+ );
+#else
+NSString *const kGPUImageYUVVideoRangeConversionForRGFragmentShaderString = SHADER_STRING
+(
+ varying vec2 textureCoordinate;
+ 
+ uniform sampler2D luminanceTexture;
+ uniform sampler2D chrominanceTexture;
+ 
+ void main()
+ {
+     vec3 yuv;
+     vec3 rgb;
+     
+     yuv.x = texture2D(luminanceTexture, textureCoordinate).r;
+     yuv.yz = texture2D(chrominanceTexture, textureCoordinate).rg - vec2(0.5, 0.5);
+     
+     // BT.601, which is the standard for SDTV is provided as a reference
+     /*
+      rgb = mat3(      1,       1,       1,
+      0, -.39465, 2.03211,
+      1.13983, -.58060,       0) * yuv;
+      */
+     
+     // Using BT.709 which is the standard for HDTV
+     rgb = mat3(      1,       1,       1,
+                0, -.21482, 2.12798,
+                1.28033, -.38059,       0) * yuv;
+     
+     gl_FragColor = vec4(rgb, 1);
+ }
+ );
+#endif
+
+NSString *const kGPUImageYUVFullRangeConversionForLAFragmentShaderString = SHADER_STRING
+(
+ varying highp vec2 textureCoordinate;
+ 
+ uniform sampler2D luminanceTexture;
+ uniform sampler2D chrominanceTexture;
+ uniform mediump mat3 colorConversionMatrix;
+ 
+ void main()
+ {
+     mediump vec3 yuv;
+     lowp vec3 rgb;
+     
+     yuv.x = texture2D(luminanceTexture, textureCoordinate).r;
+     yuv.yz = texture2D(chrominanceTexture, textureCoordinate).ra - vec2(0.5, 0.5);
+     rgb = colorConversionMatrix * yuv;
+     
+     gl_FragColor = vec4(rgb, 1);
+ }
+ );
+
+#if TARGET_IPHONE_SIMULATOR || TARGET_OS_IPHONE
+NSString *const kGPUImageYUVVideoRangeConversionForLAFragmentShaderString = SHADER_STRING
+(
+ varying highp vec2 textureCoordinate;
+ 
+ uniform sampler2D luminanceTexture;
+ uniform sampler2D chrominanceTexture;
+ uniform mediump mat3 colorConversionMatrix;
+ 
+ void main()
+ {
+     mediump vec3 yuv;
+     lowp vec3 rgb;
+     
+     yuv.x = texture2D(luminanceTexture, textureCoordinate).r - (16.0/255.0);
+     yuv.yz = texture2D(chrominanceTexture, textureCoordinate).ra - vec2(0.5, 0.5);
+     rgb = colorConversionMatrix * yuv;
+     
+     gl_FragColor = vec4(rgb, 1);
+ }
+ );
+#else
+NSString *const kGPUImageYUVVideoRangeConversionForLAFragmentShaderString = SHADER_STRING
+(
+ varying vec2 textureCoordinate;
+ 
+ uniform sampler2D luminanceTexture;
+ uniform sampler2D chrominanceTexture;
+ 
+ void main()
+ {
+     vec3 yuv;
+     vec3 rgb;
+     
+     yuv.x = texture2D(luminanceTexture, textureCoordinate).r;
+     yuv.yz = texture2D(chrominanceTexture, textureCoordinate).ra - vec2(0.5, 0.5);
+     
+     // BT.601, which is the standard for SDTV is provided as a reference
+     /*
+      rgb = mat3(      1,       1,       1,
+      0, -.39465, 2.03211,
+      1.13983, -.58060,       0) * yuv;
+      */
+     
+     // Using BT.709 which is the standard for HDTV
+     rgb = mat3(      1,       1,       1,
+                0, -.21482, 2.12798,
+                1.28033, -.38059,       0) * yuv;
+     
+     gl_FragColor = vec4(rgb, 1);
+ }
+ );
+#endif
+

LFLiveKit/Vendor/GPUImage/GPUImageColorDodgeBlendFilter.h

@@ -0,0 +1,9 @@
+#import "GPUImageTwoInputFilter.h"
+
+/** Applies a color dodge blend of two images
+ */
+@interface GPUImageColorDodgeBlendFilter : GPUImageTwoInputFilter
+{
+}
+
+@end

LFLiveKit/Vendor/GPUImage/GPUImageColorDodgeBlendFilter.m

@@ -0,0 +1,75 @@
+#import "GPUImageColorDodgeBlendFilter.h"
+
+#if TARGET_IPHONE_SIMULATOR || TARGET_OS_IPHONE
+NSString *const kGPUImageColorDodgeBlendFragmentShaderString = SHADER_STRING
+( 
+ 
+ precision mediump float;
+ 
+ varying highp vec2 textureCoordinate;
+ varying highp vec2 textureCoordinate2;
+ 
+ uniform sampler2D inputImageTexture;
+ uniform sampler2D inputImageTexture2;
+ 
+ void main()
+ {
+     vec4 base = texture2D(inputImageTexture, textureCoordinate);
+     vec4 overlay = texture2D(inputImageTexture2, textureCoordinate2);
+     
+     vec3 baseOverlayAlphaProduct = vec3(overlay.a * base.a);
+     vec3 rightHandProduct = overlay.rgb * (1.0 - base.a) + base.rgb * (1.0 - overlay.a);
+     
+     vec3 firstBlendColor = baseOverlayAlphaProduct + rightHandProduct;
+     vec3 overlayRGB = clamp((overlay.rgb / clamp(overlay.a, 0.01, 1.0)) * step(0.0, overlay.a), 0.0, 0.99);
+     
+     vec3 secondBlendColor = (base.rgb * overlay.a) / (1.0 - overlayRGB) + rightHandProduct;
+     
+     vec3 colorChoice = step((overlay.rgb * base.a + base.rgb * overlay.a), baseOverlayAlphaProduct);
+     
+     gl_FragColor = vec4(mix(firstBlendColor, secondBlendColor, colorChoice), 1.0);
+ }
+);
+#else
+NSString *const kGPUImageColorDodgeBlendFragmentShaderString = SHADER_STRING
+(
+ varying vec2 textureCoordinate;
+ varying vec2 textureCoordinate2;
+ 
+ uniform sampler2D inputImageTexture;
+ uniform sampler2D inputImageTexture2;
+ 
+ void main()
+ {
+     vec4 base = texture2D(inputImageTexture, textureCoordinate);
+     vec4 overlay = texture2D(inputImageTexture2, textureCoordinate2);
+     
+     vec3 baseOverlayAlphaProduct = vec3(overlay.a * base.a);
+     vec3 rightHandProduct = overlay.rgb * (1.0 - base.a) + base.rgb * (1.0 - overlay.a);
+     
+     vec3 firstBlendColor = baseOverlayAlphaProduct + rightHandProduct;
+     vec3 overlayRGB = clamp((overlay.rgb / clamp(overlay.a, 0.01, 1.0)) * step(0.0, overlay.a), 0.0, 0.99);
+     
+     vec3 secondBlendColor = (base.rgb * overlay.a) / (1.0 - overlayRGB) + rightHandProduct;
+     
+     vec3 colorChoice = step((overlay.rgb * base.a + base.rgb * overlay.a), baseOverlayAlphaProduct);
+     
+     gl_FragColor = vec4(mix(firstBlendColor, secondBlendColor, colorChoice), 1.0);
+ }
+);
+#endif
+
+@implementation GPUImageColorDodgeBlendFilter
+
+- (id)init;
+{
+    if (!(self = [super initWithFragmentShaderFromString:kGPUImageColorDodgeBlendFragmentShaderString]))
+    {
+		return nil;
+    }
+    
+    return self;
+}
+
+@end
+

LFLiveKit/Vendor/GPUImage/GPUImageColorInvertFilter.h

@@ -0,0 +1,7 @@
+#import "GPUImageFilter.h"
+
+@interface GPUImageColorInvertFilter : GPUImageFilter
+{
+}
+
+@end

LFLiveKit/Vendor/GPUImage/GPUImageColorInvertFilter.m

@@ -0,0 +1,46 @@
+#import "GPUImageColorInvertFilter.h"
+
+#if TARGET_IPHONE_SIMULATOR || TARGET_OS_IPHONE
+NSString *const kGPUImageInvertFragmentShaderString = SHADER_STRING
+(
+ varying highp vec2 textureCoordinate;
+ 
+ uniform sampler2D inputImageTexture;
+ 
+ void main()
+ {
+    lowp vec4 textureColor = texture2D(inputImageTexture, textureCoordinate);
+    
+    gl_FragColor = vec4((1.0 - textureColor.rgb), textureColor.w);
+ }
+);                                                                    
+#else
+NSString *const kGPUImageInvertFragmentShaderString = SHADER_STRING
+(
+ varying vec2 textureCoordinate;
+ 
+ uniform sampler2D inputImageTexture;
+ 
+ void main()
+ {
+     vec4 textureColor = texture2D(inputImageTexture, textureCoordinate);
+     
+     gl_FragColor = vec4((1.0 - textureColor.rgb), textureColor.w);
+ }
+ );
+#endif
+
+@implementation GPUImageColorInvertFilter
+
+- (id)init;
+{
+    if (!(self = [super initWithFragmentShaderFromString:kGPUImageInvertFragmentShaderString]))
+    {
+		return nil;
+    }
+    
+    return self;
+}
+
+@end
+

LFLiveKit/Vendor/GPUImage/GPUImageColorLocalBinaryPatternFilter.h

@@ -0,0 +1,5 @@
+#import "GPUImage3x3TextureSamplingFilter.h"
+
+@interface GPUImageColorLocalBinaryPatternFilter : GPUImage3x3TextureSamplingFilter
+
+@end

LFLiveKit/Vendor/GPUImage/GPUImageColorLocalBinaryPatternFilter.m

@@ -0,0 +1,159 @@
+#import "GPUImageColorLocalBinaryPatternFilter.h"
+
+// This is based on "Accelerating image recognition on mobile devices using GPGPU" by Miguel Bordallo Lopez, Henri Nykanen, Jari Hannuksela, Olli Silven and Markku Vehvilainen
+// http://www.ee.oulu.fi/~jhannuks/publications/SPIE2011a.pdf
+
+// Right pixel is the most significant bit, traveling clockwise to get to the upper right, which is the least significant
+// If the external pixel is greater than or equal to the center, set to 1, otherwise 0
+//
+// 2 1 0
+// 3   7
+// 4 5 6
+
+// 01101101
+// 76543210
+
+@implementation GPUImageColorLocalBinaryPatternFilter
+
+#if TARGET_IPHONE_SIMULATOR || TARGET_OS_IPHONE
+NSString *const kGPUImageColorLocalBinaryPatternFragmentShaderString = SHADER_STRING
+(
+ precision highp float;
+ 
+ varying vec2 textureCoordinate;
+ varying vec2 leftTextureCoordinate;
+ varying vec2 rightTextureCoordinate;
+ 
+ varying vec2 topTextureCoordinate;
+ varying vec2 topLeftTextureCoordinate;
+ varying vec2 topRightTextureCoordinate;
+ 
+ varying vec2 bottomTextureCoordinate;
+ varying vec2 bottomLeftTextureCoordinate;
+ varying vec2 bottomRightTextureCoordinate;
+ 
+ uniform sampler2D inputImageTexture;
+ 
+ void main()
+ {
+     lowp vec3 centerColor = texture2D(inputImageTexture, textureCoordinate).rgb;
+     lowp vec3 bottomLeftColor = texture2D(inputImageTexture, bottomLeftTextureCoordinate).rgb;
+     lowp vec3 topRightColor = texture2D(inputImageTexture, topRightTextureCoordinate).rgb;
+     lowp vec3 topLeftColor = texture2D(inputImageTexture, topLeftTextureCoordinate).rgb;
+     lowp vec3 bottomRightColor = texture2D(inputImageTexture, bottomRightTextureCoordinate).rgb;
+     lowp vec3 leftColor = texture2D(inputImageTexture, leftTextureCoordinate).rgb;
+     lowp vec3 rightColor = texture2D(inputImageTexture, rightTextureCoordinate).rgb;
+     lowp vec3 bottomColor = texture2D(inputImageTexture, bottomTextureCoordinate).rgb;
+     lowp vec3 topColor = texture2D(inputImageTexture, topTextureCoordinate).rgb;
+
+     lowp float redByteTally = 1.0 / 255.0 * step(centerColor.r, topRightColor.r);
+     redByteTally += 2.0 / 255.0 * step(centerColor.r, topColor.r);
+     redByteTally += 4.0 / 255.0 * step(centerColor.r, topLeftColor.r);
+     redByteTally += 8.0 / 255.0 * step(centerColor.r, leftColor.r);
+     redByteTally += 16.0 / 255.0 * step(centerColor.r, bottomLeftColor.r);
+     redByteTally += 32.0 / 255.0 * step(centerColor.r, bottomColor.r);
+     redByteTally += 64.0 / 255.0 * step(centerColor.r, bottomRightColor.r);
+     redByteTally += 128.0 / 255.0 * step(centerColor.r, rightColor.r);
+
+     lowp float blueByteTally = 1.0 / 255.0 * step(centerColor.b, topRightColor.b);
+     blueByteTally += 2.0 / 255.0 * step(centerColor.b, topColor.b);
+     blueByteTally += 4.0 / 255.0 * step(centerColor.b, topLeftColor.b);
+     blueByteTally += 8.0 / 255.0 * step(centerColor.b, leftColor.b);
+     blueByteTally += 16.0 / 255.0 * step(centerColor.b, bottomLeftColor.b);
+     blueByteTally += 32.0 / 255.0 * step(centerColor.b, bottomColor.b);
+     blueByteTally += 64.0 / 255.0 * step(centerColor.b, bottomRightColor.b);
+     blueByteTally += 128.0 / 255.0 * step(centerColor.b, rightColor.b);
+
+     lowp float greenByteTally = 1.0 / 255.0 * step(centerColor.g, topRightColor.g);
+     greenByteTally += 2.0 / 255.0 * step(centerColor.g, topColor.g);
+     greenByteTally += 4.0 / 255.0 * step(centerColor.g, topLeftColor.g);
+     greenByteTally += 8.0 / 255.0 * step(centerColor.g, leftColor.g);
+     greenByteTally += 16.0 / 255.0 * step(centerColor.g, bottomLeftColor.g);
+     greenByteTally += 32.0 / 255.0 * step(centerColor.g, bottomColor.g);
+     greenByteTally += 64.0 / 255.0 * step(centerColor.g, bottomRightColor.g);
+     greenByteTally += 128.0 / 255.0 * step(centerColor.g, rightColor.g);
+
+     // TODO: Replace the above with a dot product and two vec4s
+     // TODO: Apply step to a matrix, rather than individually
+     
+     gl_FragColor = vec4(redByteTally, blueByteTally, greenByteTally, 1.0);
+ }
+);
+#else
+NSString *const kGPUImageColorLocalBinaryPatternFragmentShaderString = SHADER_STRING
+(
+ varying vec2 textureCoordinate;
+ varying vec2 leftTextureCoordinate;
+ varying vec2 rightTextureCoordinate;
+ 
+ varying vec2 topTextureCoordinate;
+ varying vec2 topLeftTextureCoordinate;
+ varying vec2 topRightTextureCoordinate;
+ 
+ varying vec2 bottomTextureCoordinate;
+ varying vec2 bottomLeftTextureCoordinate;
+ varying vec2 bottomRightTextureCoordinate;
+ 
+ uniform sampler2D inputImageTexture;
+ 
+ void main()
+ {
+     vec3 centerColor = texture2D(inputImageTexture, textureCoordinate).rgb;
+     vec3 bottomLeftColor = texture2D(inputImageTexture, bottomLeftTextureCoordinate).rgb;
+     vec3 topRightColor = texture2D(inputImageTexture, topRightTextureCoordinate).rgb;
+     vec3 topLeftColor = texture2D(inputImageTexture, topLeftTextureCoordinate).rgb;
+     vec3 bottomRightColor = texture2D(inputImageTexture, bottomRightTextureCoordinate).rgb;
+     vec3 leftColor = texture2D(inputImageTexture, leftTextureCoordinate).rgb;
+     vec3 rightColor = texture2D(inputImageTexture, rightTextureCoordinate).rgb;
+     vec3 bottomColor = texture2D(inputImageTexture, bottomTextureCoordinate).rgb;
+     vec3 topColor = texture2D(inputImageTexture, topTextureCoordinate).rgb;
+     
+     float redByteTally = 1.0 / 255.0 * step(centerColor.r, topRightColor.r);
+     redByteTally += 2.0 / 255.0 * step(centerColor.r, topColor.r);
+     redByteTally += 4.0 / 255.0 * step(centerColor.r, topLeftColor.r);
+     redByteTally += 8.0 / 255.0 * step(centerColor.r, leftColor.r);
+     redByteTally += 16.0 / 255.0 * step(centerColor.r, bottomLeftColor.r);
+     redByteTally += 32.0 / 255.0 * step(centerColor.r, bottomColor.r);
+     redByteTally += 64.0 / 255.0 * step(centerColor.r, bottomRightColor.r);
+     redByteTally += 128.0 / 255.0 * step(centerColor.r, rightColor.r);
+     
+     float blueByteTally = 1.0 / 255.0 * step(centerColor.b, topRightColor.b);
+     blueByteTally += 2.0 / 255.0 * step(centerColor.b, topColor.b);
+     blueByteTally += 4.0 / 255.0 * step(centerColor.b, topLeftColor.b);
+     blueByteTally += 8.0 / 255.0 * step(centerColor.b, leftColor.b);
+     blueByteTally += 16.0 / 255.0 * step(centerColor.b, bottomLeftColor.b);
+     blueByteTally += 32.0 / 255.0 * step(centerColor.b, bottomColor.b);
+     blueByteTally += 64.0 / 255.0 * step(centerColor.b, bottomRightColor.b);
+     blueByteTally += 128.0 / 255.0 * step(centerColor.b, rightColor.b);
+     
+     float greenByteTally = 1.0 / 255.0 * step(centerColor.g, topRightColor.g);
+     greenByteTally += 2.0 / 255.0 * step(centerColor.g, topColor.g);
+     greenByteTally += 4.0 / 255.0 * step(centerColor.g, topLeftColor.g);
+     greenByteTally += 8.0 / 255.0 * step(centerColor.g, leftColor.g);
+     greenByteTally += 16.0 / 255.0 * step(centerColor.g, bottomLeftColor.g);
+     greenByteTally += 32.0 / 255.0 * step(centerColor.g, bottomColor.g);
+     greenByteTally += 64.0 / 255.0 * step(centerColor.g, bottomRightColor.g);
+     greenByteTally += 128.0 / 255.0 * step(centerColor.g, rightColor.g);
+     
+     // TODO: Replace the above with a dot product and two vec4s
+     // TODO: Apply step to a matrix, rather than individually
+     
+     gl_FragColor = vec4(redByteTally, blueByteTally, greenByteTally, 1.0);
+ }
+);
+#endif
+
+#pragma mark -
+#pragma mark Initialization and teardown
+
+- (id)init;
+{
+    if (!(self = [super initWithFragmentShaderFromString:kGPUImageColorLocalBinaryPatternFragmentShaderString]))
+    {
+		return nil;
+    }
+    
+    return self;
+}
+
+@end

LFLiveKit/Vendor/GPUImage/GPUImageColorMatrixFilter.h

@@ -0,0 +1,19 @@
+#import "GPUImageFilter.h"
+
+/** Transforms the colors of an image by applying a matrix to them
+ */
+@interface GPUImageColorMatrixFilter : GPUImageFilter
+{
+    GLint colorMatrixUniform;
+    GLint intensityUniform;
+}
+
+/** A 4x4 matrix used to transform each color in an image
+ */
+@property(readwrite, nonatomic) GPUMatrix4x4 colorMatrix;
+
+/** The degree to which the new transformed color replaces the original color for each pixel
+ */
+@property(readwrite, nonatomic) CGFloat intensity;
+
+@end

LFLiveKit/Vendor/GPUImage/GPUImageColorMatrixFilter.m

@@ -0,0 +1,87 @@
+#import "GPUImageColorMatrixFilter.h"
+
+#if TARGET_IPHONE_SIMULATOR || TARGET_OS_IPHONE
+NSString *const kGPUImageColorMatrixFragmentShaderString = SHADER_STRING
+(
+ varying highp vec2 textureCoordinate;
+ 
+ uniform sampler2D inputImageTexture;
+ 
+ uniform lowp mat4 colorMatrix;
+ uniform lowp float intensity;
+ 
+ void main()
+ {
+     lowp vec4 textureColor = texture2D(inputImageTexture, textureCoordinate);
+     lowp vec4 outputColor = textureColor * colorMatrix;
+     
+     gl_FragColor = (intensity * outputColor) + ((1.0 - intensity) * textureColor);
+ }
+);
+#else
+NSString *const kGPUImageColorMatrixFragmentShaderString = SHADER_STRING
+(
+ varying vec2 textureCoordinate;
+ 
+ uniform sampler2D inputImageTexture;
+ 
+ uniform mat4 colorMatrix;
+ uniform float intensity;
+ 
+ void main()
+ {
+     vec4 textureColor = texture2D(inputImageTexture, textureCoordinate);
+     vec4 outputColor = textureColor * colorMatrix;
+     
+     gl_FragColor = (intensity * outputColor) + ((1.0 - intensity) * textureColor);
+ }
+);
+#endif
+
+@implementation GPUImageColorMatrixFilter
+
+@synthesize intensity = _intensity;
+@synthesize colorMatrix = _colorMatrix;
+
+#pragma mark -
+#pragma mark Initialization and teardown
+
+- (id)init;
+{
+    if (!(self = [super initWithFragmentShaderFromString:kGPUImageColorMatrixFragmentShaderString]))
+    {
+        return nil;
+    }
+    
+    colorMatrixUniform = [filterProgram uniformIndex:@"colorMatrix"];
+    intensityUniform = [filterProgram uniformIndex:@"intensity"];
+    
+    self.intensity = 1.f;
+    self.colorMatrix = (GPUMatrix4x4){
+        {1.f, 0.f, 0.f, 0.f},
+        {0.f, 1.f, 0.f, 0.f},
+        {0.f, 0.f, 1.f, 0.f},
+        {0.f, 0.f, 0.f, 1.f}
+    };
+    
+    return self;
+}
+
+#pragma mark -
+#pragma mark Accessors
+
+- (void)setIntensity:(CGFloat)newIntensity;
+{
+    _intensity = newIntensity;
+    
+    [self setFloat:_intensity forUniform:intensityUniform program:filterProgram];
+}
+
+- (void)setColorMatrix:(GPUMatrix4x4)newColorMatrix;
+{
+    _colorMatrix = newColorMatrix;
+    
+    [self setMatrix4f:_colorMatrix forUniform:colorMatrixUniform program:filterProgram];
+}
+
+@end

LFLiveKit/Vendor/GPUImage/GPUImageColorPackingFilter.h

@@ -0,0 +1,10 @@
+#import "GPUImageFilter.h"
+
+@interface GPUImageColorPackingFilter : GPUImageFilter
+{
+    GLint texelWidthUniform, texelHeightUniform;
+    
+    CGFloat texelWidth, texelHeight;
+}
+
+@end

LFLiveKit/Vendor/GPUImage/GPUImageColorPackingFilter.m

@@ -0,0 +1,139 @@
+#import "GPUImageColorPackingFilter.h"
+
+NSString *const kGPUImageColorPackingVertexShaderString = SHADER_STRING
+(
+ attribute vec4 position;
+ attribute vec4 inputTextureCoordinate;
+ 
+ uniform float texelWidth;
+ uniform float texelHeight;
+ 
+ varying vec2 upperLeftInputTextureCoordinate;
+ varying vec2 upperRightInputTextureCoordinate;
+ varying vec2 lowerLeftInputTextureCoordinate;
+ varying vec2 lowerRightInputTextureCoordinate;
+ 
+ void main()
+ {
+     gl_Position = position;
+     
+     upperLeftInputTextureCoordinate = inputTextureCoordinate.xy + vec2(-texelWidth, -texelHeight);
+     upperRightInputTextureCoordinate = inputTextureCoordinate.xy + vec2(texelWidth, -texelHeight);
+     lowerLeftInputTextureCoordinate = inputTextureCoordinate.xy + vec2(-texelWidth, texelHeight);
+     lowerRightInputTextureCoordinate = inputTextureCoordinate.xy + vec2(texelWidth, texelHeight);
+ }
+);
+
+#if TARGET_IPHONE_SIMULATOR || TARGET_OS_IPHONE
+NSString *const kGPUImageColorPackingFragmentShaderString = SHADER_STRING
+(
+ precision lowp float;
+ 
+ uniform sampler2D inputImageTexture;
+ 
+ uniform mediump mat3 convolutionMatrix;
+ 
+ varying highp vec2 outputTextureCoordinate;
+ 
+ varying highp vec2 upperLeftInputTextureCoordinate;
+ varying highp vec2 upperRightInputTextureCoordinate;
+ varying highp vec2 lowerLeftInputTextureCoordinate;
+ varying highp vec2 lowerRightInputTextureCoordinate;
+ 
+ void main()
+ {
+     float upperLeftIntensity = texture2D(inputImageTexture, upperLeftInputTextureCoordinate).r;
+     float upperRightIntensity = texture2D(inputImageTexture, upperRightInputTextureCoordinate).r;
+     float lowerLeftIntensity = texture2D(inputImageTexture, lowerLeftInputTextureCoordinate).r;
+     float lowerRightIntensity = texture2D(inputImageTexture, lowerRightInputTextureCoordinate).r;
+     
+     gl_FragColor = vec4(upperLeftIntensity, upperRightIntensity, lowerLeftIntensity, lowerRightIntensity);
+ }
+);
+#else
+NSString *const kGPUImageColorPackingFragmentShaderString = SHADER_STRING
+(
+ uniform sampler2D inputImageTexture;
+ 
+ uniform mat3 convolutionMatrix;
+ 
+ varying vec2 outputTextureCoordinate;
+ 
+ varying vec2 upperLeftInputTextureCoordinate;
+ varying vec2 upperRightInputTextureCoordinate;
+ varying vec2 lowerLeftInputTextureCoordinate;
+ varying vec2 lowerRightInputTextureCoordinate;
+ 
+ void main()
+ {
+     float upperLeftIntensity = texture2D(inputImageTexture, upperLeftInputTextureCoordinate).r;
+     float upperRightIntensity = texture2D(inputImageTexture, upperRightInputTextureCoordinate).r;
+     float lowerLeftIntensity = texture2D(inputImageTexture, lowerLeftInputTextureCoordinate).r;
+     float lowerRightIntensity = texture2D(inputImageTexture, lowerRightInputTextureCoordinate).r;
+     
+     gl_FragColor = vec4(upperLeftIntensity, upperRightIntensity, lowerLeftIntensity, lowerRightIntensity);
+ }
+);
+#endif
+
+@implementation GPUImageColorPackingFilter
+
+#pragma mark -
+#pragma mark Initialization and teardown
+
+- (id)init;
+{
+    if (!(self = [super initWithVertexShaderFromString:kGPUImageColorPackingVertexShaderString fragmentShaderFromString:kGPUImageColorPackingFragmentShaderString]))
+    {
+        return nil;
+    }
+    
+    texelWidthUniform = [filterProgram uniformIndex:@"texelWidth"];
+    texelHeightUniform = [filterProgram uniformIndex:@"texelHeight"];
+    
+    return self;
+}
+
+- (void)setupFilterForSize:(CGSize)filterFrameSize;
+{
+    texelWidth = 0.5 / inputTextureSize.width;
+    texelHeight = 0.5 / inputTextureSize.height;
+
+    runSynchronouslyOnVideoProcessingQueue(^{
+        [GPUImageContext setActiveShaderProgram:filterProgram];
+        glUniform1f(texelWidthUniform, texelWidth);
+        glUniform1f(texelHeightUniform, texelHeight);
+    });
+}
+
+#pragma mark -
+#pragma mark Managing the display FBOs
+
+- (CGSize)sizeOfFBO;
+{
+    CGSize outputSize = [self maximumOutputSize];
+    if ( (CGSizeEqualToSize(outputSize, CGSizeZero)) || (inputTextureSize.width < outputSize.width) )
+    {
+        CGSize quarterSize;
+        quarterSize.width = inputTextureSize.width / 2.0;
+        quarterSize.height = inputTextureSize.height / 2.0;
+        return quarterSize;
+    }
+    else
+    {
+        return outputSize;
+    }
+}
+
+#pragma mark -
+#pragma mark Rendering
+
+- (CGSize)outputFrameSize;
+{
+    CGSize quarterSize;
+    quarterSize.width = inputTextureSize.width / 2.0;
+    quarterSize.height = inputTextureSize.height / 2.0;
+    return quarterSize;
+}
+
+@end

LFLiveKit/Vendor/GPUImage/GPUImageColourFASTFeatureDetector.h

@@ -0,0 +1,21 @@
+#import "GPUImageFilterGroup.h"
+
+// This generates image-wide feature descriptors using the ColourFAST process, as developed and described in
+//
+// A. Ensor and S. Hall. ColourFAST: GPU-based feature point detection and tracking on mobile devices. 28th International Conference of Image and Vision Computing, New Zealand, 2013, p. 124-129.
+//
+// Seth Hall, "GPU accelerated feature algorithms for mobile devices", PhD thesis, School of Computing and Mathematical Sciences, Auckland University of Technology 2014.
+// http://aut.researchgateway.ac.nz/handle/10292/7991
+
+@class GPUImageColourFASTSamplingOperation;
+@class GPUImageBoxBlurFilter;
+
+@interface GPUImageColourFASTFeatureDetector : GPUImageFilterGroup
+{
+    GPUImageBoxBlurFilter *blurFilter;
+    GPUImageColourFASTSamplingOperation *colourFASTSamplingOperation;
+}
+// The blur radius of the underlying box blur. The default is 3.0.
+@property (readwrite, nonatomic) CGFloat blurRadiusInPixels;
+
+@end

LFLiveKit/Vendor/GPUImage/GPUImageColourFASTFeatureDetector.m

@@ -0,0 +1,48 @@
+#import "GPUImageColourFASTFeatureDetector.h"
+#import "GPUImageColourFASTSamplingOperation.h"
+#import "GPUImageBoxBlurFilter.h"
+
+@implementation GPUImageColourFASTFeatureDetector
+
+@synthesize blurRadiusInPixels;
+
+- (id)init;
+{
+    if (!(self = [super init]))
+    {
+		return nil;
+    }
+    
+    // First pass: apply a variable Gaussian blur
+    blurFilter = [[GPUImageBoxBlurFilter alloc] init];
+    [self addFilter:blurFilter];
+        
+    // Second pass: combine the blurred image with the original sharp one
+    colourFASTSamplingOperation = [[GPUImageColourFASTSamplingOperation alloc] init];
+    [self addFilter:colourFASTSamplingOperation];
+    
+    // Texture location 0 needs to be the sharp image for both the blur and the second stage processing
+    [blurFilter addTarget:colourFASTSamplingOperation atTextureLocation:1];
+    
+    self.initialFilters = [NSArray arrayWithObjects:blurFilter, colourFASTSamplingOperation, nil];
+    self.terminalFilter = colourFASTSamplingOperation;
+    
+    self.blurRadiusInPixels = 3.0;
+    
+    return self;
+}
+
+#pragma mark -
+#pragma mark Accessors
+
+- (void)setBlurRadiusInPixels:(CGFloat)newValue;
+{
+    blurFilter.blurRadiusInPixels = newValue;
+}
+
+- (CGFloat)blurRadiusInPixels;
+{
+    return blurFilter.blurRadiusInPixels;
+}
+
+@end

LFLiveKit/Vendor/GPUImage/GPUImageColourFASTSamplingOperation.h

@@ -0,0 +1,22 @@
+#import "GPUImageTwoInputFilter.h"
+
+// This is the feature extraction phase of the ColourFAST feature detector, as described in:
+//
+// A. Ensor and S. Hall. ColourFAST: GPU-based feature point detection and tracking on mobile devices. 28th International Conference of Image and Vision Computing, New Zealand, 2013, p. 124-129.
+//
+// Seth Hall, "GPU accelerated feature algorithms for mobile devices", PhD thesis, School of Computing and Mathematical Sciences, Auckland University of Technology 2014.
+// http://aut.researchgateway.ac.nz/handle/10292/7991
+
+@interface GPUImageColourFASTSamplingOperation : GPUImageTwoInputFilter
+{
+    GLint texelWidthUniform, texelHeightUniform;
+    
+    CGFloat texelWidth, texelHeight;
+    BOOL hasOverriddenImageSizeFactor;
+}
+
+// The texel width and height determines how far out to sample from this texel. By default, this is the normalized width of a pixel, but this can be overridden for different effects.
+@property(readwrite, nonatomic) CGFloat texelWidth;
+@property(readwrite, nonatomic) CGFloat texelHeight;
+
+@end

LFLiveKit/Vendor/GPUImage/GPUImageColourFASTSamplingOperation.m

@@ -0,0 +1,204 @@
+#import "GPUImageColourFASTSamplingOperation.h"
+
+NSString *const kGPUImageColourFASTSamplingVertexShaderString = SHADER_STRING
+(
+ attribute vec4 position;
+ attribute vec4 inputTextureCoordinate;
+ attribute vec4 inputTextureCoordinate2;
+ 
+ uniform float texelWidth;
+ uniform float texelHeight;
+ 
+ varying vec2 textureCoordinate;
+ varying vec2 pointATextureCoordinate;
+ varying vec2 pointBTextureCoordinate;
+ varying vec2 pointCTextureCoordinate;
+ varying vec2 pointDTextureCoordinate;
+ varying vec2 pointETextureCoordinate;
+ varying vec2 pointFTextureCoordinate;
+ varying vec2 pointGTextureCoordinate;
+ varying vec2 pointHTextureCoordinate;
+
+ void main()
+ {
+     gl_Position = position;
+     
+     float tripleTexelWidth = 3.0 * texelWidth;
+     float tripleTexelHeight = 3.0 * texelHeight;
+     
+     textureCoordinate = inputTextureCoordinate.xy;
+     
+     pointATextureCoordinate = vec2(textureCoordinate.x + tripleTexelWidth, textureCoordinate.y + texelHeight);
+     pointBTextureCoordinate = vec2(textureCoordinate.x + texelWidth, textureCoordinate.y + tripleTexelHeight);
+     pointCTextureCoordinate = vec2(textureCoordinate.x - texelWidth, textureCoordinate.y + tripleTexelHeight);
+     pointDTextureCoordinate = vec2(textureCoordinate.x - tripleTexelWidth, textureCoordinate.y + texelHeight);
+     pointETextureCoordinate = vec2(textureCoordinate.x - tripleTexelWidth, textureCoordinate.y - texelHeight);
+     pointFTextureCoordinate = vec2(textureCoordinate.x - texelWidth, textureCoordinate.y - tripleTexelHeight);
+     pointGTextureCoordinate = vec2(textureCoordinate.x + texelWidth, textureCoordinate.y - tripleTexelHeight);
+     pointHTextureCoordinate = vec2(textureCoordinate.x + tripleTexelWidth, textureCoordinate.y - texelHeight);
+ }
+);
+
+#if TARGET_IPHONE_SIMULATOR || TARGET_OS_IPHONE
+NSString *const kGPUImageColourFASTSamplingFragmentShaderString = SHADER_STRING
+(
+ precision highp float;
+ 
+ varying vec2 textureCoordinate;
+ varying vec2 pointATextureCoordinate;
+ varying vec2 pointBTextureCoordinate;
+ varying vec2 pointCTextureCoordinate;
+ varying vec2 pointDTextureCoordinate;
+ varying vec2 pointETextureCoordinate;
+ varying vec2 pointFTextureCoordinate;
+ varying vec2 pointGTextureCoordinate;
+ varying vec2 pointHTextureCoordinate;
+ 
+ uniform sampler2D inputImageTexture;
+ uniform sampler2D inputImageTexture2;
+ const float PITwo = 6.2832;
+ const float PI = 3.1416;
+ void main()
+ {
+     vec3 centerColor = texture2D(inputImageTexture, textureCoordinate).rgb;
+     
+     vec3 pointAColor = texture2D(inputImageTexture, pointATextureCoordinate).rgb;
+     vec3 pointBColor = texture2D(inputImageTexture, pointBTextureCoordinate).rgb;
+     vec3 pointCColor = texture2D(inputImageTexture, pointCTextureCoordinate).rgb;
+     vec3 pointDColor = texture2D(inputImageTexture, pointDTextureCoordinate).rgb;
+     vec3 pointEColor = texture2D(inputImageTexture, pointETextureCoordinate).rgb;
+     vec3 pointFColor = texture2D(inputImageTexture, pointFTextureCoordinate).rgb;
+     vec3 pointGColor = texture2D(inputImageTexture, pointGTextureCoordinate).rgb;
+     vec3 pointHColor = texture2D(inputImageTexture, pointHTextureCoordinate).rgb;
+
+     vec3 colorComparison = ((pointAColor + pointBColor + pointCColor + pointDColor + pointEColor + pointFColor + pointGColor + pointHColor) * 0.125) - centerColor;
+
+     // Direction calculation drawn from Appendix B of Seth Hall's Ph.D. thesis
+     
+     vec3 dirX = (pointAColor*0.94868) + (pointBColor*0.316227) - (pointCColor*0.316227) - (pointDColor*0.94868) - (pointEColor*0.94868) - (pointFColor*0.316227) + (pointGColor*0.316227) + (pointHColor*0.94868);
+     vec3 dirY = (pointAColor*0.316227) + (pointBColor*0.94868) + (pointCColor*0.94868) + (pointDColor*0.316227) - (pointEColor*0.316227) - (pointFColor*0.94868) - (pointGColor*0.94868) - (pointHColor*0.316227);
+     vec3 absoluteDifference = abs(colorComparison);
+     float componentLength = length(colorComparison);
+     float avgX = dot(absoluteDifference, dirX) / componentLength;
+     float avgY = dot(absoluteDifference, dirY) / componentLength;
+     float angle = atan(avgY, avgX);
+     
+     vec3 normalizedColorComparison = (colorComparison + 1.0) * 0.5;
+     
+     gl_FragColor = vec4(normalizedColorComparison, (angle+PI)/PITwo);
+ }
+);
+#else
+NSString *const kGPUImageColourFASTSamplingFragmentShaderString = SHADER_STRING
+(
+ varying vec2 textureCoordinate;
+ varying vec2 pointATextureCoordinate;
+ varying vec2 pointBTextureCoordinate;
+ varying vec2 pointCTextureCoordinate;
+ varying vec2 pointDTextureCoordinate;
+ varying vec2 pointETextureCoordinate;
+ varying vec2 pointFTextureCoordinate;
+ varying vec2 pointGTextureCoordinate;
+ varying vec2 pointHTextureCoordinate;
+ 
+ uniform sampler2D inputImageTexture;
+ uniform sampler2D inputImageTexture2;
+ const float PITwo = 6.2832;
+ const float PI = 3.1416;
+ void main()
+ {
+     vec3 centerColor = texture2D(inputImageTexture, textureCoordinate).rgb;
+     
+     vec3 pointAColor = texture2D(inputImageTexture, pointATextureCoordinate).rgb;
+     vec3 pointBColor = texture2D(inputImageTexture, pointBTextureCoordinate).rgb;
+     vec3 pointCColor = texture2D(inputImageTexture, pointCTextureCoordinate).rgb;
+     vec3 pointDColor = texture2D(inputImageTexture, pointDTextureCoordinate).rgb;
+     vec3 pointEColor = texture2D(inputImageTexture, pointETextureCoordinate).rgb;
+     vec3 pointFColor = texture2D(inputImageTexture, pointFTextureCoordinate).rgb;
+     vec3 pointGColor = texture2D(inputImageTexture, pointGTextureCoordinate).rgb;
+     vec3 pointHColor = texture2D(inputImageTexture, pointHTextureCoordinate).rgb;
+     
+     vec3 colorComparison = ((pointAColor + pointBColor + pointCColor + pointDColor + pointEColor + pointFColor + pointGColor + pointHColor) * 0.125) - centerColor;
+     
+     // Direction calculation drawn from Appendix B of Seth Hall's Ph.D. thesis
+     
+     vec3 dirX = (pointAColor*0.94868) + (pointBColor*0.316227) - (pointCColor*0.316227) - (pointDColor*0.94868) - (pointEColor*0.94868) - (pointFColor*0.316227) + (pointGColor*0.316227) + (pointHColor*0.94868);
+     vec3 dirY = (pointAColor*0.316227) + (pointBColor*0.94868) + (pointCColor*0.94868) + (pointDColor*0.316227) - (pointEColor*0.316227) - (pointFColor*0.94868) - (pointGColor*0.94868) - (pointHColor*0.316227);
+     vec3 absoluteDifference = abs(colorComparison);
+     float componentLength = length(colorComparison);
+     float avgX = dot(absoluteDifference, dirX) / componentLength;
+     float avgY = dot(absoluteDifference, dirY) / componentLength;
+     float angle = atan(avgY, avgX);
+     
+     vec3 normalizedColorComparison = (colorComparison + 1.0) * 0.5;
+     
+     gl_FragColor = vec4(normalizedColorComparison, (angle+PI)/PITwo);
+ }
+);
+#endif
+
+
+@implementation GPUImageColourFASTSamplingOperation
+
+@synthesize texelWidth = _texelWidth;
+@synthesize texelHeight = _texelHeight;
+
+#pragma mark -
+#pragma mark Initialization and teardown
+
+- (id)initWithFragmentShaderFromString:(NSString *)fragmentShaderString;
+{
+    if (!(self = [super initWithVertexShaderFromString:kGPUImageColourFASTSamplingVertexShaderString fragmentShaderFromString:kGPUImageColourFASTSamplingFragmentShaderString]))
+    {
+        return nil;
+    }
+    
+    texelWidthUniform = [filterProgram uniformIndex:@"texelWidth"];
+    texelHeightUniform = [filterProgram uniformIndex:@"texelHeight"];
+    
+    return self;
+}
+
+- (void)setupFilterForSize:(CGSize)filterFrameSize;
+{
+    if (!hasOverriddenImageSizeFactor)
+    {
+        _texelWidth = 1.0 / filterFrameSize.width;
+        _texelHeight = 1.0 / filterFrameSize.height;
+        
+        runSynchronouslyOnVideoProcessingQueue(^{
+            [GPUImageContext setActiveShaderProgram:filterProgram];
+            if (GPUImageRotationSwapsWidthAndHeight(inputRotation))
+            {
+                glUniform1f(texelWidthUniform, _texelHeight);
+                glUniform1f(texelHeightUniform, _texelWidth);
+            }
+            else
+            {
+                glUniform1f(texelWidthUniform, _texelWidth);
+                glUniform1f(texelHeightUniform, _texelHeight);
+            }
+        });
+    }
+}
+
+#pragma mark -
+#pragma mark Accessors
+
+- (void)setTexelWidth:(CGFloat)newValue;
+{
+    hasOverriddenImageSizeFactor = YES;
+    _texelWidth = newValue;
+    
+    [self setFloat:_texelWidth forUniform:texelWidthUniform program:filterProgram];
+}
+
+- (void)setTexelHeight:(CGFloat)newValue;
+{
+    hasOverriddenImageSizeFactor = YES;
+    _texelHeight = newValue;
+    
+    [self setFloat:_texelHeight forUniform:texelHeightUniform program:filterProgram];
+}
+
+@end

LFLiveKit/Vendor/GPUImage/GPUImageContrastFilter.h

@@ -0,0 +1,14 @@
+#import "GPUImageFilter.h"
+
+/** Adjusts the contrast of the image
+ */
+@interface GPUImageContrastFilter : GPUImageFilter
+{
+    GLint contrastUniform;
+}
+
+/** Contrast ranges from 0.0 to 4.0 (max contrast), with 1.0 as the normal level
+ */
+@property(readwrite, nonatomic) CGFloat contrast; 
+
+@end

LFLiveKit/Vendor/GPUImage/GPUImageContrastFilter.m

@@ -0,0 +1,66 @@
+#import "GPUImageContrastFilter.h"
+
+#if TARGET_IPHONE_SIMULATOR || TARGET_OS_IPHONE
+NSString *const kGPUImageContrastFragmentShaderString = SHADER_STRING
+( 
+ varying highp vec2 textureCoordinate;
+ 
+ uniform sampler2D inputImageTexture;
+ uniform lowp float contrast;
+ 
+ void main()
+ {
+     lowp vec4 textureColor = texture2D(inputImageTexture, textureCoordinate);
+     
+     gl_FragColor = vec4(((textureColor.rgb - vec3(0.5)) * contrast + vec3(0.5)), textureColor.w);
+ }
+);
+#else
+NSString *const kGPUImageContrastFragmentShaderString = SHADER_STRING
+(
+ varying vec2 textureCoordinate;
+ 
+ uniform sampler2D inputImageTexture;
+ uniform float contrast;
+ 
+ void main()
+ {
+     vec4 textureColor = texture2D(inputImageTexture, textureCoordinate);
+     
+     gl_FragColor = vec4(((textureColor.rgb - vec3(0.5)) * contrast + vec3(0.5)), textureColor.w);
+ }
+ );
+#endif
+
+@implementation GPUImageContrastFilter
+
+@synthesize contrast = _contrast;
+
+#pragma mark -
+#pragma mark Initialization
+
+- (id)init;
+{
+    if (!(self = [super initWithFragmentShaderFromString:kGPUImageContrastFragmentShaderString]))
+    {
+		return nil;
+    }
+    
+    contrastUniform = [filterProgram uniformIndex:@"contrast"];
+    self.contrast = 1.0;
+    
+    return self;
+}
+
+#pragma mark -
+#pragma mark Accessors
+
+- (void)setContrast:(CGFloat)newValue;
+{
+    _contrast = newValue;
+    
+    [self setFloat:_contrast forUniform:contrastUniform program:filterProgram];
+}
+
+@end
+

LFLiveKit/Vendor/GPUImage/GPUImageCropFilter.h

@@ -0,0 +1,14 @@
+#import "GPUImageFilter.h"
+
+@interface GPUImageCropFilter : GPUImageFilter
+{
+    GLfloat cropTextureCoordinates[8];
+}
+
+// The crop region is the rectangle within the image to crop. It is normalized to a coordinate space from 0.0 to 1.0, with 0.0, 0.0 being the upper left corner of the image
+@property(readwrite, nonatomic) CGRect cropRegion;
+
+// Initialization and teardown
+- (id)initWithCropRegion:(CGRect)newCropRegion;
+
+@end

LFLiveKit/Vendor/GPUImage/GPUImageCropFilter.m

@@ -0,0 +1,274 @@
+#import "GPUImageCropFilter.h"
+
+#if TARGET_IPHONE_SIMULATOR || TARGET_OS_IPHONE
+NSString *const kGPUImageCropFragmentShaderString =  SHADER_STRING
+(
+ varying highp vec2 textureCoordinate;
+ 
+ uniform sampler2D inputImageTexture;
+ 
+ void main()
+ {
+     gl_FragColor = texture2D(inputImageTexture, textureCoordinate);
+ }
+);
+#else
+NSString *const kGPUImageCropFragmentShaderString =  SHADER_STRING
+(
+ varying vec2 textureCoordinate;
+ 
+ uniform sampler2D inputImageTexture;
+ 
+ void main()
+ {
+     gl_FragColor = texture2D(inputImageTexture, textureCoordinate);
+ }
+);
+#endif
+
+@interface GPUImageCropFilter ()
+
+- (void)calculateCropTextureCoordinates;
+
+@end
+
+@interface GPUImageCropFilter()
+{
+    CGSize originallySuppliedInputSize;
+}
+
+@end
+
+@implementation GPUImageCropFilter
+
+@synthesize cropRegion = _cropRegion;
+
+#pragma mark -
+#pragma mark Initialization and teardown
+
+- (id)initWithCropRegion:(CGRect)newCropRegion;
+{
+    if (!(self = [super initWithFragmentShaderFromString:kGPUImageCropFragmentShaderString]))
+    {
+        return nil;
+    }
+    
+    self.cropRegion = newCropRegion;
+
+    return self;
+}
+
+- (id)init;
+{
+    if (!(self = [self initWithCropRegion:CGRectMake(0.0, 0.0, 1.0, 1.0)]))
+    {
+        return nil;
+    }
+    
+    return self;
+}
+
+#pragma mark -
+#pragma mark Rendering
+
+- (void)setInputSize:(CGSize)newSize atIndex:(NSInteger)textureIndex;
+{
+    if (self.preventRendering)
+    {
+        return;
+    }
+    
+//    if (overrideInputSize)
+//    {
+//        if (CGSizeEqualToSize(forcedMaximumSize, CGSizeZero))
+//        {
+//            return;
+//        }
+//        else
+//        {
+//            CGRect insetRect = AVMakeRectWithAspectRatioInsideRect(newSize, CGRectMake(0.0, 0.0, forcedMaximumSize.width, forcedMaximumSize.height));
+//            inputTextureSize = insetRect.size;
+//            return;
+//        }
+//    }
+    
+    CGSize rotatedSize = [self rotatedSize:newSize forIndex:textureIndex];
+    originallySuppliedInputSize = rotatedSize;
+
+    CGSize scaledSize;
+    scaledSize.width = rotatedSize.width * _cropRegion.size.width;
+    scaledSize.height = rotatedSize.height * _cropRegion.size.height;
+
+    
+    if (CGSizeEqualToSize(scaledSize, CGSizeZero))
+    {
+        inputTextureSize = scaledSize;
+    }
+    else if (!CGSizeEqualToSize(inputTextureSize, scaledSize))
+    {
+        inputTextureSize = scaledSize;
+    }
+}
+
+#pragma mark -
+#pragma mark GPUImageInput
+
+- (void)calculateCropTextureCoordinates;
+{
+    CGFloat minX = _cropRegion.origin.x;
+    CGFloat minY = _cropRegion.origin.y;
+    CGFloat maxX = CGRectGetMaxX(_cropRegion);
+    CGFloat maxY = CGRectGetMaxY(_cropRegion);
+    
+    switch(inputRotation)
+    {
+        case kGPUImageNoRotation: // Works
+        {
+            cropTextureCoordinates[0] = minX; // 0,0
+            cropTextureCoordinates[1] = minY;
+            
+            cropTextureCoordinates[2] = maxX; // 1,0
+            cropTextureCoordinates[3] = minY;
+
+            cropTextureCoordinates[4] = minX; // 0,1
+            cropTextureCoordinates[5] = maxY;
+
+            cropTextureCoordinates[6] = maxX; // 1,1
+            cropTextureCoordinates[7] = maxY;
+        }; break;
+        case kGPUImageRotateLeft: // Fixed
+        {
+            cropTextureCoordinates[0] = maxY; // 1,0
+            cropTextureCoordinates[1] = 1.0 - maxX;
+
+            cropTextureCoordinates[2] = maxY; // 1,1
+            cropTextureCoordinates[3] = 1.0 - minX;
+
+            cropTextureCoordinates[4] = minY; // 0,0
+            cropTextureCoordinates[5] = 1.0 - maxX;
+
+            cropTextureCoordinates[6] = minY; // 0,1
+            cropTextureCoordinates[7] = 1.0 - minX;
+        }; break;
+        case kGPUImageRotateRight: // Fixed
+        {
+            cropTextureCoordinates[0] = minY; // 0,1
+            cropTextureCoordinates[1] = 1.0 - minX;
+
+            cropTextureCoordinates[2] = minY; // 0,0
+            cropTextureCoordinates[3] = 1.0 - maxX;
+            
+            cropTextureCoordinates[4] = maxY; // 1,1
+            cropTextureCoordinates[5] = 1.0 - minX;
+
+            cropTextureCoordinates[6] = maxY; // 1,0
+            cropTextureCoordinates[7] = 1.0 - maxX;
+        }; break;
+        case kGPUImageFlipVertical: // Works for me
+        {
+            cropTextureCoordinates[0] = minX; // 0,1
+            cropTextureCoordinates[1] = maxY;
+
+            cropTextureCoordinates[2] = maxX; // 1,1
+            cropTextureCoordinates[3] = maxY;
+
+            cropTextureCoordinates[4] = minX; // 0,0
+            cropTextureCoordinates[5] = minY;
+            
+            cropTextureCoordinates[6] = maxX; // 1,0
+            cropTextureCoordinates[7] = minY;
+        }; break;
+        case kGPUImageFlipHorizonal: // Works for me
+        {
+            cropTextureCoordinates[0] = maxX; // 1,0
+            cropTextureCoordinates[1] = minY;
+
+            cropTextureCoordinates[2] = minX; // 0,0
+            cropTextureCoordinates[3] = minY;
+            
+            cropTextureCoordinates[4] = maxX; // 1,1
+            cropTextureCoordinates[5] = maxY;
+            
+            cropTextureCoordinates[6] = minX; // 0,1
+            cropTextureCoordinates[7] = maxY;
+        }; break;
+        case kGPUImageRotate180: // Fixed
+        {
+            cropTextureCoordinates[0] = maxX; // 1,1
+            cropTextureCoordinates[1] = maxY;
+
+            cropTextureCoordinates[2] = minX; // 0,1
+            cropTextureCoordinates[3] = maxY;
+
+            cropTextureCoordinates[4] = maxX; // 1,0
+            cropTextureCoordinates[5] = minY;
+
+            cropTextureCoordinates[6] = minX; // 0,0
+            cropTextureCoordinates[7] = minY;
+        }; break;
+        case kGPUImageRotateRightFlipVertical: // Fixed
+        {
+            cropTextureCoordinates[0] = minY; // 0,0
+            cropTextureCoordinates[1] = 1.0 - maxX;
+            
+            cropTextureCoordinates[2] = minY; // 0,1
+            cropTextureCoordinates[3] = 1.0 - minX;
+
+            cropTextureCoordinates[4] = maxY; // 1,0
+            cropTextureCoordinates[5] = 1.0 - maxX;
+            
+            cropTextureCoordinates[6] = maxY; // 1,1
+            cropTextureCoordinates[7] = 1.0 - minX;
+        }; break;
+        case kGPUImageRotateRightFlipHorizontal: // Fixed
+        {
+            cropTextureCoordinates[0] = maxY; // 1,1
+            cropTextureCoordinates[1] = 1.0 - minX;
+
+            cropTextureCoordinates[2] = maxY; // 1,0
+            cropTextureCoordinates[3] = 1.0 - maxX;
+
+            cropTextureCoordinates[4] = minY; // 0,1
+            cropTextureCoordinates[5] = 1.0 - minX;
+
+            cropTextureCoordinates[6] = minY; // 0,0
+            cropTextureCoordinates[7] = 1.0 - maxX;
+        }; break;
+    }
+}
+
+- (void)newFrameReadyAtTime:(CMTime)frameTime atIndex:(NSInteger)textureIndex;
+{
+    static const GLfloat cropSquareVertices[] = {
+        -1.0f, -1.0f,
+        1.0f, -1.0f,
+        -1.0f,  1.0f,
+        1.0f,  1.0f,
+    };
+    
+    [self renderToTextureWithVertices:cropSquareVertices textureCoordinates:cropTextureCoordinates];
+
+    [self informTargetsAboutNewFrameAtTime:frameTime];
+}
+
+#pragma mark -
+#pragma mark Accessors
+
+- (void)setCropRegion:(CGRect)newValue;
+{
+    NSParameterAssert(newValue.origin.x >= 0 && newValue.origin.x <= 1 &&
+                      newValue.origin.y >= 0 && newValue.origin.y <= 1 &&
+                      newValue.size.width >= 0 && newValue.size.width <= 1 &&
+                      newValue.size.height >= 0 && newValue.size.height <= 1);
+
+    _cropRegion = newValue;
+    [self calculateCropTextureCoordinates];
+}
+
+- (void)setInputRotation:(GPUImageRotationMode)newInputRotation atIndex:(NSInteger)textureIndex;
+{
+    [super setInputRotation:newInputRotation atIndex:textureIndex];
+    [self calculateCropTextureCoordinates];
+}
+
+@end

LFLiveKit/Vendor/GPUImage/GPUImageCrosshairGenerator.h

@@ -0,0 +1,17 @@
+#import "GPUImageFilter.h"
+
+@interface GPUImageCrosshairGenerator : GPUImageFilter
+{
+    GLint crosshairWidthUniform, crosshairColorUniform;
+}
+
+// The width of the displayed crosshairs, in pixels. Currently this only works well for odd widths. The default is 5.
+@property(readwrite, nonatomic) CGFloat crosshairWidth;
+
+// The color of the crosshairs is specified using individual red, green, and blue components (normalized to 1.0). The default is green: (0.0, 1.0, 0.0).
+- (void)setCrosshairColorRed:(GLfloat)redComponent green:(GLfloat)greenComponent blue:(GLfloat)blueComponent;
+
+// Rendering
+- (void)renderCrosshairsFromArray:(GLfloat *)crosshairCoordinates count:(NSUInteger)numberOfCrosshairs frameTime:(CMTime)frameTime;
+
+@end

LFLiveKit/Vendor/GPUImage/GPUImageCrosshairGenerator.m

@@ -0,0 +1,139 @@
+#import "GPUImageCrosshairGenerator.h"
+
+NSString *const kGPUImageCrosshairVertexShaderString = SHADER_STRING
+(
+ attribute vec4 position;
+ 
+ uniform float crosshairWidth;
+ 
+ varying vec2 centerLocation;
+ varying float pointSpacing;
+ 
+ void main()
+ {
+     gl_Position = vec4(((position.xy * 2.0) - 1.0), 0.0, 1.0);
+     gl_PointSize = crosshairWidth + 1.0;
+     pointSpacing = 1.0 / crosshairWidth;
+     centerLocation = vec2(pointSpacing * ceil(crosshairWidth / 2.0), pointSpacing * ceil(crosshairWidth / 2.0));
+ }
+);
+
+#if TARGET_IPHONE_SIMULATOR || TARGET_OS_IPHONE
+NSString *const kGPUImageCrosshairFragmentShaderString = SHADER_STRING
+(
+ uniform lowp vec3 crosshairColor;
+
+ varying highp vec2 centerLocation;
+ varying highp float pointSpacing;
+
+ void main()
+ {
+     lowp vec2 distanceFromCenter = abs(centerLocation - gl_PointCoord.xy);
+     lowp float axisTest = step(pointSpacing, gl_PointCoord.y) * step(distanceFromCenter.x, 0.09) + step(pointSpacing, gl_PointCoord.x) * step(distanceFromCenter.y, 0.09);
+
+     gl_FragColor = vec4(crosshairColor * axisTest, axisTest);
+//     gl_FragColor = vec4(distanceFromCenterInX, distanceFromCenterInY, 0.0, 1.0);
+ }
+);
+#else
+NSString *const kGPUImageCrosshairFragmentShaderString = SHADER_STRING
+(
+ GPUImageEscapedHashIdentifier(version 120)\n
+ 
+ uniform vec3 crosshairColor;
+ 
+ varying vec2 centerLocation;
+ varying float pointSpacing;
+ 
+ void main()
+ {
+     vec2 distanceFromCenter = abs(centerLocation - gl_PointCoord.xy);
+     float axisTest = step(pointSpacing, gl_PointCoord.y) * step(distanceFromCenter.x, 0.09) + step(pointSpacing, gl_PointCoord.x) * step(distanceFromCenter.y, 0.09);
+     
+     gl_FragColor = vec4(crosshairColor * axisTest, axisTest);
+     //     gl_FragColor = vec4(distanceFromCenterInX, distanceFromCenterInY, 0.0, 1.0);
+ }
+);
+#endif
+
+@implementation GPUImageCrosshairGenerator
+
+@synthesize crosshairWidth = _crosshairWidth;
+
+#pragma mark -
+#pragma mark Initialization and teardown
+
+- (id)init;
+{
+    if (!(self = [super initWithVertexShaderFromString:kGPUImageCrosshairVertexShaderString fragmentShaderFromString:kGPUImageCrosshairFragmentShaderString]))
+    {
+        return nil;
+    }
+    
+    runSynchronouslyOnVideoProcessingQueue(^{
+        crosshairWidthUniform = [filterProgram uniformIndex:@"crosshairWidth"];
+        crosshairColorUniform = [filterProgram uniformIndex:@"crosshairColor"];
+        
+        self.crosshairWidth = 5.0;
+        [self setCrosshairColorRed:0.0 green:1.0 blue:0.0];
+    });
+    
+    return self;
+}
+
+#pragma mark -
+#pragma mark Rendering
+
+- (void)renderCrosshairsFromArray:(GLfloat *)crosshairCoordinates count:(NSUInteger)numberOfCrosshairs frameTime:(CMTime)frameTime;
+{
+    if (self.preventRendering)
+    {
+        return;
+    }
+    
+    runSynchronouslyOnVideoProcessingQueue(^{
+        [GPUImageContext setActiveShaderProgram:filterProgram];
+        
+#if TARGET_IPHONE_SIMULATOR || TARGET_OS_IPHONE
+#else
+        glEnable(GL_POINT_SPRITE);
+        glEnable(GL_VERTEX_PROGRAM_POINT_SIZE);
+#endif
+        
+        outputFramebuffer = [[GPUImageContext sharedFramebufferCache] fetchFramebufferForSize:[self sizeOfFBO] textureOptions:self.outputTextureOptions onlyTexture:NO];
+        [outputFramebuffer activateFramebuffer];
+        
+        glClearColor(0.0, 0.0, 0.0, 0.0);
+        glClear(GL_COLOR_BUFFER_BIT);
+        
+        glVertexAttribPointer(filterPositionAttribute, 2, GL_FLOAT, 0, 0, crosshairCoordinates);
+        
+        glDrawArrays(GL_POINTS, 0, (GLsizei)numberOfCrosshairs);
+        
+        [self informTargetsAboutNewFrameAtTime:frameTime];
+    });
+}
+
+- (void)renderToTextureWithVertices:(const GLfloat *)vertices textureCoordinates:(const GLfloat *)textureCoordinates;
+{
+    // Prevent rendering of the frame by normal means
+}
+
+#pragma mark -
+#pragma mark Accessors
+
+- (void)setCrosshairWidth:(CGFloat)newValue;
+{
+    _crosshairWidth = newValue;
+    
+    [self setFloat:_crosshairWidth forUniform:crosshairWidthUniform program:filterProgram];
+}
+
+- (void)setCrosshairColorRed:(GLfloat)redComponent green:(GLfloat)greenComponent blue:(GLfloat)blueComponent;
+{
+    GPUVector3 crosshairColor = {redComponent, greenComponent, blueComponent};
+    
+    [self setVec3:crosshairColor forUniform:crosshairColorUniform program:filterProgram];
+}
+
+@end

LFLiveKit/Vendor/GPUImage/GPUImageCrosshatchFilter.h

@@ -0,0 +1,13 @@
+#import "GPUImageFilter.h"
+
+@interface GPUImageCrosshatchFilter : GPUImageFilter
+{
+    GLint crossHatchSpacingUniform, lineWidthUniform;
+}
+// The fractional width of the image to use as the spacing for the crosshatch. The default is 0.03.
+@property(readwrite, nonatomic) CGFloat crossHatchSpacing;
+
+// A relative width for the crosshatch lines. The default is 0.003.
+@property(readwrite, nonatomic) CGFloat lineWidth;
+
+@end

LFLiveKit/Vendor/GPUImage/GPUImageCrosshatchFilter.m

@@ -0,0 +1,163 @@
+#import "GPUImageCrosshatchFilter.h"
+
+// Shader code based on http://machinesdontcare.wordpress.com/
+
+#if TARGET_IPHONE_SIMULATOR || TARGET_OS_IPHONE
+NSString *const kGPUImageCrosshatchFragmentShaderString = SHADER_STRING
+(
+ varying highp vec2 textureCoordinate;
+ 
+ uniform sampler2D inputImageTexture;
+
+ uniform highp float crossHatchSpacing;
+ uniform highp float lineWidth;
+ 
+ const highp vec3 W = vec3(0.2125, 0.7154, 0.0721);
+
+ void main()
+ {
+     highp float luminance = dot(texture2D(inputImageTexture, textureCoordinate).rgb, W);
+     
+     lowp vec4 colorToDisplay = vec4(1.0, 1.0, 1.0, 1.0);
+     if (luminance < 1.00) 
+     {
+         if (mod(textureCoordinate.x + textureCoordinate.y, crossHatchSpacing) <= lineWidth) 
+         {
+             colorToDisplay = vec4(0.0, 0.0, 0.0, 1.0);
+         }
+     }
+     if (luminance < 0.75) 
+     {
+         if (mod(textureCoordinate.x - textureCoordinate.y, crossHatchSpacing) <= lineWidth) 
+         {
+             colorToDisplay = vec4(0.0, 0.0, 0.0, 1.0);
+         }
+     }
+     if (luminance < 0.50) 
+     {
+         if (mod(textureCoordinate.x + textureCoordinate.y - (crossHatchSpacing / 2.0), crossHatchSpacing) <= lineWidth) 
+         {
+             colorToDisplay = vec4(0.0, 0.0, 0.0, 1.0);
+         }
+     }
+     if (luminance < 0.3) 
+     {
+         if (mod(textureCoordinate.x - textureCoordinate.y - (crossHatchSpacing / 2.0), crossHatchSpacing) <= lineWidth) 
+         {
+             colorToDisplay = vec4(0.0, 0.0, 0.0, 1.0);
+         }
+     }
+
+     gl_FragColor = colorToDisplay;
+ }
+);
+#else
+NSString *const kGPUImageCrosshatchFragmentShaderString = SHADER_STRING
+(
+ varying vec2 textureCoordinate;
+ 
+ uniform sampler2D inputImageTexture;
+ 
+ uniform float crossHatchSpacing;
+ uniform float lineWidth;
+ 
+ const vec3 W = vec3(0.2125, 0.7154, 0.0721);
+ 
+ void main()
+ {
+     float luminance = dot(texture2D(inputImageTexture, textureCoordinate).rgb, W);
+     
+     vec4 colorToDisplay = vec4(1.0, 1.0, 1.0, 1.0);
+     if (luminance < 1.00)
+     {
+         if (mod(textureCoordinate.x + textureCoordinate.y, crossHatchSpacing) <= lineWidth)
+         {
+             colorToDisplay = vec4(0.0, 0.0, 0.0, 1.0);
+         }
+     }
+     if (luminance < 0.75)
+     {
+         if (mod(textureCoordinate.x - textureCoordinate.y, crossHatchSpacing) <= lineWidth)
+         {
+             colorToDisplay = vec4(0.0, 0.0, 0.0, 1.0);
+         }
+     }
+     if (luminance < 0.50)
+     {
+         if (mod(textureCoordinate.x + textureCoordinate.y - (crossHatchSpacing / 2.0), crossHatchSpacing) <= lineWidth)
+         {
+             colorToDisplay = vec4(0.0, 0.0, 0.0, 1.0);
+         }
+     }
+     if (luminance < 0.3)
+     {
+         if (mod(textureCoordinate.x - textureCoordinate.y - (crossHatchSpacing / 2.0), crossHatchSpacing) <= lineWidth)
+         {
+             colorToDisplay = vec4(0.0, 0.0, 0.0, 1.0);
+         }
+     }
+     
+     gl_FragColor = colorToDisplay;
+ }
+);
+#endif
+
+@implementation GPUImageCrosshatchFilter
+
+@synthesize crossHatchSpacing = _crossHatchSpacing;
+@synthesize lineWidth = _lineWidth;
+
+#pragma mark -
+#pragma mark Initialization and teardown
+
+- (id)init;
+{
+    if (!(self = [super initWithFragmentShaderFromString:kGPUImageCrosshatchFragmentShaderString]))
+    {
+		return nil;
+    }
+    
+    crossHatchSpacingUniform = [filterProgram uniformIndex:@"crossHatchSpacing"];
+    lineWidthUniform = [filterProgram uniformIndex:@"lineWidth"];
+    
+    self.crossHatchSpacing = 0.03;
+    self.lineWidth = 0.003;
+    
+    return self;
+}
+
+#pragma mark -
+#pragma mark Accessors
+
+- (void)setCrossHatchSpacing:(CGFloat)newValue;
+{
+    CGFloat singlePixelSpacing;
+    if (inputTextureSize.width != 0.0)
+    {
+        singlePixelSpacing = 1.0 / inputTextureSize.width;
+    }
+    else
+    {
+        singlePixelSpacing = 1.0 / 2048.0;
+    }
+    
+    if (newValue < singlePixelSpacing)
+    {
+        _crossHatchSpacing = singlePixelSpacing;
+    }
+    else
+    {
+        _crossHatchSpacing = newValue;
+    }
+    
+    [self setFloat:_crossHatchSpacing forUniform:crossHatchSpacingUniform program:filterProgram];
+}
+
+- (void)setLineWidth:(CGFloat)newValue;
+{
+    _lineWidth = newValue;
+    
+    [self setFloat:_lineWidth forUniform:lineWidthUniform program:filterProgram];
+}
+
+@end

LFLiveKit/Vendor/GPUImage/GPUImageDarkenBlendFilter.h

@@ -0,0 +1,7 @@
+#import "GPUImageTwoInputFilter.h"
+
+@interface GPUImageDarkenBlendFilter : GPUImageTwoInputFilter
+{
+}
+
+@end

LFLiveKit/Vendor/GPUImage/GPUImageDarkenBlendFilter.m

@@ -0,0 +1,52 @@
+#import "GPUImageDarkenBlendFilter.h"
+
+#if TARGET_IPHONE_SIMULATOR || TARGET_OS_IPHONE
+NSString *const kGPUImageDarkenBlendFragmentShaderString = SHADER_STRING
+(
+ varying highp vec2 textureCoordinate;
+ varying highp vec2 textureCoordinate2;
+
+ uniform sampler2D inputImageTexture;
+ uniform sampler2D inputImageTexture2;
+ 
+ void main()
+ {
+    lowp vec4 base = texture2D(inputImageTexture, textureCoordinate);
+    lowp vec4 overlayer = texture2D(inputImageTexture2, textureCoordinate2);
+    
+    gl_FragColor = vec4(min(overlayer.rgb * base.a, base.rgb * overlayer.a) + overlayer.rgb * (1.0 - base.a) + base.rgb * (1.0 - overlayer.a), 1.0);
+ }
+);
+#else
+NSString *const kGPUImageDarkenBlendFragmentShaderString = SHADER_STRING
+(
+ varying vec2 textureCoordinate;
+ varying vec2 textureCoordinate2;
+ 
+ uniform sampler2D inputImageTexture;
+ uniform sampler2D inputImageTexture2;
+ 
+ void main()
+ {
+     vec4 base = texture2D(inputImageTexture, textureCoordinate);
+     vec4 overlayer = texture2D(inputImageTexture2, textureCoordinate2);
+     
+     gl_FragColor = vec4(min(overlayer.rgb * base.a, base.rgb * overlayer.a) + overlayer.rgb * (1.0 - base.a) + base.rgb * (1.0 - overlayer.a), 1.0);
+ }
+ );
+#endif
+
+@implementation GPUImageDarkenBlendFilter
+
+- (id)init;
+{
+    if (!(self = [super initWithFragmentShaderFromString:kGPUImageDarkenBlendFragmentShaderString]))
+    {
+		return nil;
+    }
+    
+    return self;
+}
+
+@end
+

LFLiveKit/Vendor/GPUImage/GPUImageDifferenceBlendFilter.h

@@ -0,0 +1,7 @@
+#import "GPUImageTwoInputFilter.h"
+
+@interface GPUImageDifferenceBlendFilter : GPUImageTwoInputFilter
+{
+}
+
+@end

LFLiveKit/Vendor/GPUImage/GPUImageDifferenceBlendFilter.m

@@ -0,0 +1,50 @@
+#import "GPUImageDifferenceBlendFilter.h"
+
+#if TARGET_IPHONE_SIMULATOR || TARGET_OS_IPHONE
+NSString *const kGPUImageDifferenceBlendFragmentShaderString = SHADER_STRING
+(
+ varying highp vec2 textureCoordinate;
+ varying highp vec2 textureCoordinate2;
+
+ uniform sampler2D inputImageTexture;
+ uniform sampler2D inputImageTexture2;
+ 
+ void main()
+ {
+     mediump vec4 textureColor = texture2D(inputImageTexture, textureCoordinate);
+     mediump vec4 textureColor2 = texture2D(inputImageTexture2, textureCoordinate2);
+     gl_FragColor = vec4(abs(textureColor2.rgb - textureColor.rgb), textureColor.a);
+ }
+);
+#else
+NSString *const kGPUImageDifferenceBlendFragmentShaderString = SHADER_STRING
+(
+ varying vec2 textureCoordinate;
+ varying vec2 textureCoordinate2;
+ 
+ uniform sampler2D inputImageTexture;
+ uniform sampler2D inputImageTexture2;
+ 
+ void main()
+ {
+     vec4 textureColor = texture2D(inputImageTexture, textureCoordinate);
+     vec4 textureColor2 = texture2D(inputImageTexture2, textureCoordinate2);
+     gl_FragColor = vec4(abs(textureColor2.rgb - textureColor.rgb), textureColor.a);
+ }
+);
+#endif
+
+@implementation GPUImageDifferenceBlendFilter
+
+- (id)init;
+{
+    if (!(self = [super initWithFragmentShaderFromString:kGPUImageDifferenceBlendFragmentShaderString]))
+    {
+		return nil;
+    }
+    
+    return self;
+}
+
+@end
+

LFLiveKit/Vendor/GPUImage/GPUImageDilationFilter.h

@@ -0,0 +1,16 @@
+#import "GPUImageTwoPassTextureSamplingFilter.h"
+
+// For each pixel, this sets it to the maximum value of the red channel in a rectangular neighborhood extending out dilationRadius pixels from the center.
+// This extends out bright features, and is most commonly used with black-and-white thresholded images.
+
+extern NSString *const kGPUImageDilationRadiusOneVertexShaderString;
+extern NSString *const kGPUImageDilationRadiusTwoVertexShaderString;
+extern NSString *const kGPUImageDilationRadiusThreeVertexShaderString;
+extern NSString *const kGPUImageDilationRadiusFourVertexShaderString;
+
+@interface GPUImageDilationFilter : GPUImageTwoPassTextureSamplingFilter
+
+// Acceptable values for dilationRadius, which sets the distance in pixels to sample out from the center, are 1, 2, 3, and 4.
+- (id)initWithRadius:(NSUInteger)dilationRadius;
+
+@end

LFLiveKit/Vendor/GPUImage/GPUImageDilationFilter.m

@@ -0,0 +1,431 @@
+#import "GPUImageDilationFilter.h"
+
+@implementation GPUImageDilationFilter
+
+NSString *const kGPUImageDilationRadiusOneVertexShaderString = SHADER_STRING
+(
+ attribute vec4 position;
+ attribute vec2 inputTextureCoordinate;
+ 
+ uniform float texelWidthOffset; 
+ uniform float texelHeightOffset; 
+ 
+ varying vec2 centerTextureCoordinate;
+ varying vec2 oneStepPositiveTextureCoordinate;
+ varying vec2 oneStepNegativeTextureCoordinate;
+ 
+ void main()
+ {
+     gl_Position = position;
+     
+     vec2 offset = vec2(texelWidthOffset, texelHeightOffset);
+     
+     centerTextureCoordinate = inputTextureCoordinate;
+     oneStepNegativeTextureCoordinate = inputTextureCoordinate - offset;
+     oneStepPositiveTextureCoordinate = inputTextureCoordinate + offset;
+ }
+);
+
+NSString *const kGPUImageDilationRadiusTwoVertexShaderString = SHADER_STRING
+(
+ attribute vec4 position;
+ attribute vec2 inputTextureCoordinate;
+ 
+ uniform float texelWidthOffset;
+ uniform float texelHeightOffset;
+ 
+ varying vec2 centerTextureCoordinate;
+ varying vec2 oneStepPositiveTextureCoordinate;
+ varying vec2 oneStepNegativeTextureCoordinate;
+ varying vec2 twoStepsPositiveTextureCoordinate;
+ varying vec2 twoStepsNegativeTextureCoordinate;
+ 
+ void main()
+ {
+     gl_Position = position;
+     
+     vec2 offset = vec2(texelWidthOffset, texelHeightOffset);
+     
+     centerTextureCoordinate = inputTextureCoordinate;
+     oneStepNegativeTextureCoordinate = inputTextureCoordinate - offset;
+     oneStepPositiveTextureCoordinate = inputTextureCoordinate + offset;
+     twoStepsNegativeTextureCoordinate = inputTextureCoordinate - (offset * 2.0);
+     twoStepsPositiveTextureCoordinate = inputTextureCoordinate + (offset * 2.0);
+ }
+);
+
+NSString *const kGPUImageDilationRadiusThreeVertexShaderString = SHADER_STRING
+(
+ attribute vec4 position;
+ attribute vec2 inputTextureCoordinate;
+ 
+ uniform float texelWidthOffset;
+ uniform float texelHeightOffset;
+ 
+ varying vec2 centerTextureCoordinate;
+ varying vec2 oneStepPositiveTextureCoordinate;
+ varying vec2 oneStepNegativeTextureCoordinate;
+ varying vec2 twoStepsPositiveTextureCoordinate;
+ varying vec2 twoStepsNegativeTextureCoordinate;
+ varying vec2 threeStepsPositiveTextureCoordinate;
+ varying vec2 threeStepsNegativeTextureCoordinate;
+ 
+ void main()
+ {
+     gl_Position = position;
+     
+     vec2 offset = vec2(texelWidthOffset, texelHeightOffset);
+     
+     centerTextureCoordinate = inputTextureCoordinate;
+     oneStepNegativeTextureCoordinate = inputTextureCoordinate - offset;
+     oneStepPositiveTextureCoordinate = inputTextureCoordinate + offset;
+     twoStepsNegativeTextureCoordinate = inputTextureCoordinate - (offset * 2.0);
+     twoStepsPositiveTextureCoordinate = inputTextureCoordinate + (offset * 2.0);
+     threeStepsNegativeTextureCoordinate = inputTextureCoordinate - (offset * 3.0);
+     threeStepsPositiveTextureCoordinate = inputTextureCoordinate + (offset * 3.0);
+ }
+);
+
+NSString *const kGPUImageDilationRadiusFourVertexShaderString = SHADER_STRING
+(
+ attribute vec4 position;
+ attribute vec2 inputTextureCoordinate;
+ 
+ uniform float texelWidthOffset;
+ uniform float texelHeightOffset;
+ 
+ varying vec2 centerTextureCoordinate;
+ varying vec2 oneStepPositiveTextureCoordinate;
+ varying vec2 oneStepNegativeTextureCoordinate;
+ varying vec2 twoStepsPositiveTextureCoordinate;
+ varying vec2 twoStepsNegativeTextureCoordinate;
+ varying vec2 threeStepsPositiveTextureCoordinate;
+ varying vec2 threeStepsNegativeTextureCoordinate;
+ varying vec2 fourStepsPositiveTextureCoordinate;
+ varying vec2 fourStepsNegativeTextureCoordinate;
+ 
+ void main()
+ {
+     gl_Position = position;
+     
+     vec2 offset = vec2(texelWidthOffset, texelHeightOffset);
+     
+     centerTextureCoordinate = inputTextureCoordinate;
+     oneStepNegativeTextureCoordinate = inputTextureCoordinate - offset;
+     oneStepPositiveTextureCoordinate = inputTextureCoordinate + offset;
+     twoStepsNegativeTextureCoordinate = inputTextureCoordinate - (offset * 2.0);
+     twoStepsPositiveTextureCoordinate = inputTextureCoordinate + (offset * 2.0);
+     threeStepsNegativeTextureCoordinate = inputTextureCoordinate - (offset * 3.0);
+     threeStepsPositiveTextureCoordinate = inputTextureCoordinate + (offset * 3.0);
+     fourStepsNegativeTextureCoordinate = inputTextureCoordinate - (offset * 4.0);
+     fourStepsPositiveTextureCoordinate = inputTextureCoordinate + (offset * 4.0);
+ }
+);
+
+#if TARGET_IPHONE_SIMULATOR || TARGET_OS_IPHONE
+NSString *const kGPUImageDilationRadiusOneFragmentShaderString = SHADER_STRING
+(
+ precision lowp float;
+ 
+ varying vec2 centerTextureCoordinate;
+ varying vec2 oneStepPositiveTextureCoordinate;
+ varying vec2 oneStepNegativeTextureCoordinate;
+  
+ uniform sampler2D inputImageTexture;
+ 
+ void main()
+ {
+     float centerIntensity = texture2D(inputImageTexture, centerTextureCoordinate).r;
+     float oneStepPositiveIntensity = texture2D(inputImageTexture, oneStepPositiveTextureCoordinate).r;
+     float oneStepNegativeIntensity = texture2D(inputImageTexture, oneStepNegativeTextureCoordinate).r;
+          
+     lowp float maxValue = max(centerIntensity, oneStepPositiveIntensity);
+     maxValue = max(maxValue, oneStepNegativeIntensity);
+
+     gl_FragColor = vec4(vec3(maxValue), 1.0);
+ }
+);
+
+NSString *const kGPUImageDilationRadiusTwoFragmentShaderString = SHADER_STRING
+(
+ precision lowp float;
+ 
+ varying vec2 centerTextureCoordinate;
+ varying vec2 oneStepPositiveTextureCoordinate;
+ varying vec2 oneStepNegativeTextureCoordinate;
+ varying vec2 twoStepsPositiveTextureCoordinate;
+ varying vec2 twoStepsNegativeTextureCoordinate;
+
+ uniform sampler2D inputImageTexture;
+ 
+ void main()
+ {
+     float centerIntensity = texture2D(inputImageTexture, centerTextureCoordinate).r;
+     float oneStepPositiveIntensity = texture2D(inputImageTexture, oneStepPositiveTextureCoordinate).r;
+     float oneStepNegativeIntensity = texture2D(inputImageTexture, oneStepNegativeTextureCoordinate).r;
+     float twoStepsPositiveIntensity = texture2D(inputImageTexture, twoStepsPositiveTextureCoordinate).r;
+     float twoStepsNegativeIntensity = texture2D(inputImageTexture, twoStepsNegativeTextureCoordinate).r;
+     
+     lowp float maxValue = max(centerIntensity, oneStepPositiveIntensity);
+     maxValue = max(maxValue, oneStepNegativeIntensity);
+     maxValue = max(maxValue, twoStepsPositiveIntensity);
+     maxValue = max(maxValue, twoStepsNegativeIntensity);
+     
+     gl_FragColor = vec4(vec3(maxValue), 1.0);
+ }
+);
+
+NSString *const kGPUImageDilationRadiusThreeFragmentShaderString = SHADER_STRING
+(
+ precision lowp float;
+ 
+ varying vec2 centerTextureCoordinate;
+ varying vec2 oneStepPositiveTextureCoordinate;
+ varying vec2 oneStepNegativeTextureCoordinate;
+ varying vec2 twoStepsPositiveTextureCoordinate;
+ varying vec2 twoStepsNegativeTextureCoordinate;
+ varying vec2 threeStepsPositiveTextureCoordinate;
+ varying vec2 threeStepsNegativeTextureCoordinate;
+
+ uniform sampler2D inputImageTexture;
+ 
+ void main()
+ {
+     float centerIntensity = texture2D(inputImageTexture, centerTextureCoordinate).r;
+     float oneStepPositiveIntensity = texture2D(inputImageTexture, oneStepPositiveTextureCoordinate).r;
+     float oneStepNegativeIntensity = texture2D(inputImageTexture, oneStepNegativeTextureCoordinate).r;
+     float twoStepsPositiveIntensity = texture2D(inputImageTexture, twoStepsPositiveTextureCoordinate).r;
+     float twoStepsNegativeIntensity = texture2D(inputImageTexture, twoStepsNegativeTextureCoordinate).r;
+     float threeStepsPositiveIntensity = texture2D(inputImageTexture, threeStepsPositiveTextureCoordinate).r;
+     float threeStepsNegativeIntensity = texture2D(inputImageTexture, threeStepsNegativeTextureCoordinate).r;
+     
+     lowp float maxValue = max(centerIntensity, oneStepPositiveIntensity);
+     maxValue = max(maxValue, oneStepNegativeIntensity);
+     maxValue = max(maxValue, twoStepsPositiveIntensity);
+     maxValue = max(maxValue, twoStepsNegativeIntensity);
+     maxValue = max(maxValue, threeStepsPositiveIntensity);
+     maxValue = max(maxValue, threeStepsNegativeIntensity);
+     
+     gl_FragColor = vec4(vec3(maxValue), 1.0);
+ }
+);
+
+NSString *const kGPUImageDilationRadiusFourFragmentShaderString = SHADER_STRING
+(
+ precision lowp float;
+ 
+ varying vec2 centerTextureCoordinate;
+ varying vec2 oneStepPositiveTextureCoordinate;
+ varying vec2 oneStepNegativeTextureCoordinate;
+ varying vec2 twoStepsPositiveTextureCoordinate;
+ varying vec2 twoStepsNegativeTextureCoordinate;
+ varying vec2 threeStepsPositiveTextureCoordinate;
+ varying vec2 threeStepsNegativeTextureCoordinate;
+ varying vec2 fourStepsPositiveTextureCoordinate;
+ varying vec2 fourStepsNegativeTextureCoordinate;
+ 
+ uniform sampler2D inputImageTexture;
+ 
+ void main()
+ {
+     float centerIntensity = texture2D(inputImageTexture, centerTextureCoordinate).r;
+     float oneStepPositiveIntensity = texture2D(inputImageTexture, oneStepPositiveTextureCoordinate).r;
+     float oneStepNegativeIntensity = texture2D(inputImageTexture, oneStepNegativeTextureCoordinate).r;
+     float twoStepsPositiveIntensity = texture2D(inputImageTexture, twoStepsPositiveTextureCoordinate).r;
+     float twoStepsNegativeIntensity = texture2D(inputImageTexture, twoStepsNegativeTextureCoordinate).r;
+     float threeStepsPositiveIntensity = texture2D(inputImageTexture, threeStepsPositiveTextureCoordinate).r;
+     float threeStepsNegativeIntensity = texture2D(inputImageTexture, threeStepsNegativeTextureCoordinate).r;
+     float fourStepsPositiveIntensity = texture2D(inputImageTexture, fourStepsPositiveTextureCoordinate).r;
+     float fourStepsNegativeIntensity = texture2D(inputImageTexture, fourStepsNegativeTextureCoordinate).r;
+     
+     lowp float maxValue = max(centerIntensity, oneStepPositiveIntensity);
+     maxValue = max(maxValue, oneStepNegativeIntensity);
+     maxValue = max(maxValue, twoStepsPositiveIntensity);
+     maxValue = max(maxValue, twoStepsNegativeIntensity);
+     maxValue = max(maxValue, threeStepsPositiveIntensity);
+     maxValue = max(maxValue, threeStepsNegativeIntensity);
+     maxValue = max(maxValue, fourStepsPositiveIntensity);
+     maxValue = max(maxValue, fourStepsNegativeIntensity);
+     
+     gl_FragColor = vec4(vec3(maxValue), 1.0);
+ }
+);
+#else
+NSString *const kGPUImageDilationRadiusOneFragmentShaderString = SHADER_STRING
+(
+ varying vec2 centerTextureCoordinate;
+ varying vec2 oneStepPositiveTextureCoordinate;
+ varying vec2 oneStepNegativeTextureCoordinate;
+ 
+ uniform sampler2D inputImageTexture;
+ 
+ void main()
+ {
+     float centerIntensity = texture2D(inputImageTexture, centerTextureCoordinate).r;
+     float oneStepPositiveIntensity = texture2D(inputImageTexture, oneStepPositiveTextureCoordinate).r;
+     float oneStepNegativeIntensity = texture2D(inputImageTexture, oneStepNegativeTextureCoordinate).r;
+     
+     float maxValue = max(centerIntensity, oneStepPositiveIntensity);
+     maxValue = max(maxValue, oneStepNegativeIntensity);
+     
+     gl_FragColor = vec4(vec3(maxValue), 1.0);
+ }
+);
+
+NSString *const kGPUImageDilationRadiusTwoFragmentShaderString = SHADER_STRING
+(
+ varying vec2 centerTextureCoordinate;
+ varying vec2 oneStepPositiveTextureCoordinate;
+ varying vec2 oneStepNegativeTextureCoordinate;
+ varying vec2 twoStepsPositiveTextureCoordinate;
+ varying vec2 twoStepsNegativeTextureCoordinate;
+ 
+ uniform sampler2D inputImageTexture;
+ 
+ void main()
+ {
+     float centerIntensity = texture2D(inputImageTexture, centerTextureCoordinate).r;
+     float oneStepPositiveIntensity = texture2D(inputImageTexture, oneStepPositiveTextureCoordinate).r;
+     float oneStepNegativeIntensity = texture2D(inputImageTexture, oneStepNegativeTextureCoordinate).r;
+     float twoStepsPositiveIntensity = texture2D(inputImageTexture, twoStepsPositiveTextureCoordinate).r;
+     float twoStepsNegativeIntensity = texture2D(inputImageTexture, twoStepsNegativeTextureCoordinate).r;
+     
+     float maxValue = max(centerIntensity, oneStepPositiveIntensity);
+     maxValue = max(maxValue, oneStepNegativeIntensity);
+     maxValue = max(maxValue, twoStepsPositiveIntensity);
+     maxValue = max(maxValue, twoStepsNegativeIntensity);
+     
+     gl_FragColor = vec4(vec3(maxValue), 1.0);
+ }
+);
+
+NSString *const kGPUImageDilationRadiusThreeFragmentShaderString = SHADER_STRING
+(
+ varying vec2 centerTextureCoordinate;
+ varying vec2 oneStepPositiveTextureCoordinate;
+ varying vec2 oneStepNegativeTextureCoordinate;
+ varying vec2 twoStepsPositiveTextureCoordinate;
+ varying vec2 twoStepsNegativeTextureCoordinate;
+ varying vec2 threeStepsPositiveTextureCoordinate;
+ varying vec2 threeStepsNegativeTextureCoordinate;
+ 
+ uniform sampler2D inputImageTexture;
+ 
+ void main()
+ {
+     float centerIntensity = texture2D(inputImageTexture, centerTextureCoordinate).r;
+     float oneStepPositiveIntensity = texture2D(inputImageTexture, oneStepPositiveTextureCoordinate).r;
+     float oneStepNegativeIntensity = texture2D(inputImageTexture, oneStepNegativeTextureCoordinate).r;
+     float twoStepsPositiveIntensity = texture2D(inputImageTexture, twoStepsPositiveTextureCoordinate).r;
+     float twoStepsNegativeIntensity = texture2D(inputImageTexture, twoStepsNegativeTextureCoordinate).r;
+     float threeStepsPositiveIntensity = texture2D(inputImageTexture, threeStepsPositiveTextureCoordinate).r;
+     float threeStepsNegativeIntensity = texture2D(inputImageTexture, threeStepsNegativeTextureCoordinate).r;
+     
+     float maxValue = max(centerIntensity, oneStepPositiveIntensity);
+     maxValue = max(maxValue, oneStepNegativeIntensity);
+     maxValue = max(maxValue, twoStepsPositiveIntensity);
+     maxValue = max(maxValue, twoStepsNegativeIntensity);
+     maxValue = max(maxValue, threeStepsPositiveIntensity);
+     maxValue = max(maxValue, threeStepsNegativeIntensity);
+     
+     gl_FragColor = vec4(vec3(maxValue), 1.0);
+ }
+);
+
+NSString *const kGPUImageDilationRadiusFourFragmentShaderString = SHADER_STRING
+(
+ varying vec2 centerTextureCoordinate;
+ varying vec2 oneStepPositiveTextureCoordinate;
+ varying vec2 oneStepNegativeTextureCoordinate;
+ varying vec2 twoStepsPositiveTextureCoordinate;
+ varying vec2 twoStepsNegativeTextureCoordinate;
+ varying vec2 threeStepsPositiveTextureCoordinate;
+ varying vec2 threeStepsNegativeTextureCoordinate;
+ varying vec2 fourStepsPositiveTextureCoordinate;
+ varying vec2 fourStepsNegativeTextureCoordinate;
+ 
+ uniform sampler2D inputImageTexture;
+ 
+ void main()
+ {
+     float centerIntensity = texture2D(inputImageTexture, centerTextureCoordinate).r;
+     float oneStepPositiveIntensity = texture2D(inputImageTexture, oneStepPositiveTextureCoordinate).r;
+     float oneStepNegativeIntensity = texture2D(inputImageTexture, oneStepNegativeTextureCoordinate).r;
+     float twoStepsPositiveIntensity = texture2D(inputImageTexture, twoStepsPositiveTextureCoordinate).r;
+     float twoStepsNegativeIntensity = texture2D(inputImageTexture, twoStepsNegativeTextureCoordinate).r;
+     float threeStepsPositiveIntensity = texture2D(inputImageTexture, threeStepsPositiveTextureCoordinate).r;
+     float threeStepsNegativeIntensity = texture2D(inputImageTexture, threeStepsNegativeTextureCoordinate).r;
+     float fourStepsPositiveIntensity = texture2D(inputImageTexture, fourStepsPositiveTextureCoordinate).r;
+     float fourStepsNegativeIntensity = texture2D(inputImageTexture, fourStepsNegativeTextureCoordinate).r;
+     
+     float maxValue = max(centerIntensity, oneStepPositiveIntensity);
+     maxValue = max(maxValue, oneStepNegativeIntensity);
+     maxValue = max(maxValue, twoStepsPositiveIntensity);
+     maxValue = max(maxValue, twoStepsNegativeIntensity);
+     maxValue = max(maxValue, threeStepsPositiveIntensity);
+     maxValue = max(maxValue, threeStepsNegativeIntensity);
+     maxValue = max(maxValue, fourStepsPositiveIntensity);
+     maxValue = max(maxValue, fourStepsNegativeIntensity);
+     
+     gl_FragColor = vec4(vec3(maxValue), 1.0);
+ }
+);
+#endif
+
+#pragma mark -
+#pragma mark Initialization and teardown
+
+- (id)initWithRadius:(NSUInteger)dilationRadius;
+{    
+    NSString *fragmentShaderForThisRadius = nil;
+    NSString *vertexShaderForThisRadius = nil;
+    
+    switch (dilationRadius)
+    {
+        case 0:
+        case 1:
+        {
+            vertexShaderForThisRadius = kGPUImageDilationRadiusOneVertexShaderString;
+            fragmentShaderForThisRadius = kGPUImageDilationRadiusOneFragmentShaderString;
+        }; break;
+        case 2:
+        {
+            vertexShaderForThisRadius = kGPUImageDilationRadiusTwoVertexShaderString;
+            fragmentShaderForThisRadius = kGPUImageDilationRadiusTwoFragmentShaderString;
+        }; break;
+        case 3:
+        {
+            vertexShaderForThisRadius = kGPUImageDilationRadiusThreeVertexShaderString;
+            fragmentShaderForThisRadius = kGPUImageDilationRadiusThreeFragmentShaderString;
+        }; break;
+        case 4:
+        {
+            vertexShaderForThisRadius = kGPUImageDilationRadiusFourVertexShaderString;
+            fragmentShaderForThisRadius = kGPUImageDilationRadiusFourFragmentShaderString;
+        }; break;
+        default:
+        {
+            vertexShaderForThisRadius = kGPUImageDilationRadiusFourVertexShaderString;
+            fragmentShaderForThisRadius = kGPUImageDilationRadiusFourFragmentShaderString;
+        }; break;
+    }
+    
+    if (!(self = [super initWithFirstStageVertexShaderFromString:vertexShaderForThisRadius firstStageFragmentShaderFromString:fragmentShaderForThisRadius secondStageVertexShaderFromString:vertexShaderForThisRadius secondStageFragmentShaderFromString:fragmentShaderForThisRadius]))
+    {
+        return nil;
+    }
+    
+    return self;
+}
+
+- (id)init;
+{
+    if (!(self = [self initWithRadius:1]))
+    {
+        return nil;
+    }
+    
+    return self;
+}
+
+@end

LFLiveKit/Vendor/GPUImage/GPUImageDirectionalNonMaximumSuppressionFilter.h

@@ -0,0 +1,19 @@
+#import "GPUImageFilter.h"
+
+@interface GPUImageDirectionalNonMaximumSuppressionFilter : GPUImageFilter
+{
+    GLint texelWidthUniform, texelHeightUniform;
+    GLint upperThresholdUniform, lowerThresholdUniform;
+    
+    BOOL hasOverriddenImageSizeFactor;
+}
+
+// The texel width and height determines how far out to sample from this texel. By default, this is the normalized width of a pixel, but this can be overridden for different effects.
+@property(readwrite, nonatomic) CGFloat texelWidth; 
+@property(readwrite, nonatomic) CGFloat texelHeight; 
+
+// These thresholds set cutoffs for the intensities that definitely get registered (upper threshold) and those that definitely don't (lower threshold)
+@property(readwrite, nonatomic) CGFloat upperThreshold;
+@property(readwrite, nonatomic) CGFloat lowerThreshold;
+
+@end

LFLiveKit/Vendor/GPUImage/GPUImageDirectionalNonMaximumSuppressionFilter.m

@@ -0,0 +1,141 @@
+#import "GPUImageDirectionalNonMaximumSuppressionFilter.h"
+
+@implementation GPUImageDirectionalNonMaximumSuppressionFilter
+
+#if TARGET_IPHONE_SIMULATOR || TARGET_OS_IPHONE
+NSString *const kGPUImageDirectionalNonmaximumSuppressionFragmentShaderString = SHADER_STRING
+(
+ precision mediump float;
+ 
+ varying highp vec2 textureCoordinate;
+ 
+ uniform sampler2D inputImageTexture;
+ uniform highp float texelWidth; 
+ uniform highp float texelHeight; 
+ uniform mediump float upperThreshold; 
+ uniform mediump float lowerThreshold; 
+
+ void main()
+ {
+     vec3 currentGradientAndDirection = texture2D(inputImageTexture, textureCoordinate).rgb;
+     vec2 gradientDirection = ((currentGradientAndDirection.gb * 2.0) - 1.0) * vec2(texelWidth, texelHeight);
+     
+     float firstSampledGradientMagnitude = texture2D(inputImageTexture, textureCoordinate + gradientDirection).r;
+     float secondSampledGradientMagnitude = texture2D(inputImageTexture, textureCoordinate - gradientDirection).r;
+     
+     float multiplier = step(firstSampledGradientMagnitude, currentGradientAndDirection.r);
+     multiplier = multiplier * step(secondSampledGradientMagnitude, currentGradientAndDirection.r);
+     
+     float thresholdCompliance = smoothstep(lowerThreshold, upperThreshold, currentGradientAndDirection.r);
+     multiplier = multiplier * thresholdCompliance;
+     
+     gl_FragColor = vec4(multiplier, multiplier, multiplier, 1.0);
+ }
+);
+#else
+NSString *const kGPUImageDirectionalNonmaximumSuppressionFragmentShaderString = SHADER_STRING
+(
+ varying vec2 textureCoordinate;
+ 
+ uniform sampler2D inputImageTexture;
+ uniform float texelWidth;
+ uniform float texelHeight;
+ uniform float upperThreshold;
+ uniform float lowerThreshold;
+ 
+ void main()
+ {
+     vec3 currentGradientAndDirection = texture2D(inputImageTexture, textureCoordinate).rgb;
+     vec2 gradientDirection = ((currentGradientAndDirection.gb * 2.0) - 1.0) * vec2(texelWidth, texelHeight);
+     
+     float firstSampledGradientMagnitude = texture2D(inputImageTexture, textureCoordinate + gradientDirection).r;
+     float secondSampledGradientMagnitude = texture2D(inputImageTexture, textureCoordinate - gradientDirection).r;
+     
+     float multiplier = step(firstSampledGradientMagnitude, currentGradientAndDirection.r);
+     multiplier = multiplier * step(secondSampledGradientMagnitude, currentGradientAndDirection.r);
+     
+     float thresholdCompliance = smoothstep(lowerThreshold, upperThreshold, currentGradientAndDirection.r);
+     multiplier = multiplier * thresholdCompliance;
+     
+     gl_FragColor = vec4(multiplier, multiplier, multiplier, 1.0);
+ }
+);
+#endif
+
+@synthesize texelWidth = _texelWidth; 
+@synthesize texelHeight = _texelHeight; 
+@synthesize upperThreshold = _upperThreshold;
+@synthesize lowerThreshold = _lowerThreshold;
+
+#pragma mark -
+#pragma mark Initialization and teardown
+
+- (id)init;
+{
+    if (!(self = [super initWithFragmentShaderFromString:kGPUImageDirectionalNonmaximumSuppressionFragmentShaderString]))
+    {
+        return nil;
+    }
+    
+    texelWidthUniform = [filterProgram uniformIndex:@"texelWidth"];
+    texelHeightUniform = [filterProgram uniformIndex:@"texelHeight"];
+    upperThresholdUniform = [filterProgram uniformIndex:@"upperThreshold"];
+    lowerThresholdUniform = [filterProgram uniformIndex:@"lowerThreshold"];
+    
+    self.upperThreshold = 0.5;
+    self.lowerThreshold = 0.1;
+    
+    return self;
+}
+
+- (void)setupFilterForSize:(CGSize)filterFrameSize;
+{
+    if (!hasOverriddenImageSizeFactor)
+    {
+        _texelWidth = 1.0 / filterFrameSize.width;
+        _texelHeight = 1.0 / filterFrameSize.height;
+        
+        runSynchronouslyOnVideoProcessingQueue(^{
+            [GPUImageContext setActiveShaderProgram:filterProgram];
+            glUniform1f(texelWidthUniform, _texelWidth);
+            glUniform1f(texelHeightUniform, _texelHeight);
+        });
+    }
+}
+
+#pragma mark -
+#pragma mark Accessors
+
+- (void)setTexelWidth:(CGFloat)newValue;
+{
+    hasOverriddenImageSizeFactor = YES;
+    _texelWidth = newValue;
+    
+    [self setFloat:_texelWidth forUniform:texelWidthUniform program:filterProgram];
+}
+
+- (void)setTexelHeight:(CGFloat)newValue;
+{
+    hasOverriddenImageSizeFactor = YES;
+    _texelHeight = newValue;
+    
+    [self setFloat:_texelHeight forUniform:texelHeightUniform program:filterProgram];
+}
+
+- (void)setLowerThreshold:(CGFloat)newValue;
+{
+    _lowerThreshold = newValue;
+    
+    [self setFloat:_lowerThreshold forUniform:lowerThresholdUniform program:filterProgram];
+}
+
+- (void)setUpperThreshold:(CGFloat)newValue;
+{
+    _upperThreshold = newValue;
+
+    [self setFloat:_upperThreshold forUniform:upperThresholdUniform program:filterProgram];
+}
+
+
+
+@end

LFLiveKit/Vendor/GPUImage/GPUImageDirectionalSobelEdgeDetectionFilter.h

@@ -0,0 +1,5 @@
+#import "GPUImage3x3TextureSamplingFilter.h"
+
+@interface GPUImageDirectionalSobelEdgeDetectionFilter : GPUImage3x3TextureSamplingFilter
+
+@end

LFLiveKit/Vendor/GPUImage/GPUImageDirectionalSobelEdgeDetectionFilter.m

@@ -0,0 +1,103 @@
+#import "GPUImageDirectionalSobelEdgeDetectionFilter.h"
+
+@implementation GPUImageDirectionalSobelEdgeDetectionFilter
+
+#if TARGET_IPHONE_SIMULATOR || TARGET_OS_IPHONE
+NSString *const kGPUImageDirectionalSobelEdgeDetectionFragmentShaderString = SHADER_STRING
+(
+ precision mediump float;
+ 
+ varying vec2 textureCoordinate;
+ varying vec2 leftTextureCoordinate;
+ varying vec2 rightTextureCoordinate;
+ 
+ varying vec2 topTextureCoordinate;
+ varying vec2 topLeftTextureCoordinate;
+ varying vec2 topRightTextureCoordinate;
+ 
+ varying vec2 bottomTextureCoordinate;
+ varying vec2 bottomLeftTextureCoordinate;
+ varying vec2 bottomRightTextureCoordinate;
+ 
+ uniform sampler2D inputImageTexture;
+ 
+ void main()
+ {
+     float bottomLeftIntensity = texture2D(inputImageTexture, bottomLeftTextureCoordinate).r;
+     float topRightIntensity = texture2D(inputImageTexture, topRightTextureCoordinate).r;
+     float topLeftIntensity = texture2D(inputImageTexture, topLeftTextureCoordinate).r;
+     float bottomRightIntensity = texture2D(inputImageTexture, bottomRightTextureCoordinate).r;
+     float leftIntensity = texture2D(inputImageTexture, leftTextureCoordinate).r;
+     float rightIntensity = texture2D(inputImageTexture, rightTextureCoordinate).r;
+     float bottomIntensity = texture2D(inputImageTexture, bottomTextureCoordinate).r;
+     float topIntensity = texture2D(inputImageTexture, topTextureCoordinate).r;
+     
+     vec2 gradientDirection;
+     gradientDirection.x = -bottomLeftIntensity - 2.0 * leftIntensity - topLeftIntensity + bottomRightIntensity + 2.0 * rightIntensity + topRightIntensity;
+     gradientDirection.y = -topLeftIntensity - 2.0 * topIntensity - topRightIntensity + bottomLeftIntensity + 2.0 * bottomIntensity + bottomRightIntensity;
+     
+     float gradientMagnitude = length(gradientDirection);
+     vec2 normalizedDirection = normalize(gradientDirection);
+     normalizedDirection = sign(normalizedDirection) * floor(abs(normalizedDirection) + 0.617316); // Offset by 1-sin(pi/8) to set to 0 if near axis, 1 if away
+     normalizedDirection = (normalizedDirection + 1.0) * 0.5; // Place -1.0 - 1.0 within 0 - 1.0
+     
+     gl_FragColor = vec4(gradientMagnitude, normalizedDirection.x, normalizedDirection.y, 1.0);
+ }
+);
+#else
+NSString *const kGPUImageDirectionalSobelEdgeDetectionFragmentShaderString = SHADER_STRING
+(
+ varying vec2 textureCoordinate;
+ varying vec2 leftTextureCoordinate;
+ varying vec2 rightTextureCoordinate;
+ 
+ varying vec2 topTextureCoordinate;
+ varying vec2 topLeftTextureCoordinate;
+ varying vec2 topRightTextureCoordinate;
+ 
+ varying vec2 bottomTextureCoordinate;
+ varying vec2 bottomLeftTextureCoordinate;
+ varying vec2 bottomRightTextureCoordinate;
+ 
+ uniform sampler2D inputImageTexture;
+ 
+ void main()
+ {
+     float bottomLeftIntensity = texture2D(inputImageTexture, bottomLeftTextureCoordinate).r;
+     float topRightIntensity = texture2D(inputImageTexture, topRightTextureCoordinate).r;
+     float topLeftIntensity = texture2D(inputImageTexture, topLeftTextureCoordinate).r;
+     float bottomRightIntensity = texture2D(inputImageTexture, bottomRightTextureCoordinate).r;
+     float leftIntensity = texture2D(inputImageTexture, leftTextureCoordinate).r;
+     float rightIntensity = texture2D(inputImageTexture, rightTextureCoordinate).r;
+     float bottomIntensity = texture2D(inputImageTexture, bottomTextureCoordinate).r;
+     float topIntensity = texture2D(inputImageTexture, topTextureCoordinate).r;
+     
+     vec2 gradientDirection;
+     gradientDirection.x = -bottomLeftIntensity - 2.0 * leftIntensity - topLeftIntensity + bottomRightIntensity + 2.0 * rightIntensity + topRightIntensity;
+     gradientDirection.y = -topLeftIntensity - 2.0 * topIntensity - topRightIntensity + bottomLeftIntensity + 2.0 * bottomIntensity + bottomRightIntensity;
+     
+     float gradientMagnitude = length(gradientDirection);
+     vec2 normalizedDirection = normalize(gradientDirection);
+     normalizedDirection = sign(normalizedDirection) * floor(abs(normalizedDirection) + 0.617316); // Offset by 1-sin(pi/8) to set to 0 if near axis, 1 if away
+     normalizedDirection = (normalizedDirection + 1.0) * 0.5; // Place -1.0 - 1.0 within 0 - 1.0
+     
+     gl_FragColor = vec4(gradientMagnitude, normalizedDirection.x, normalizedDirection.y, 1.0);
+ }
+);
+#endif
+
+#pragma mark -
+#pragma mark Initialization and teardown
+
+- (id)init;
+{
+    if (!(self = [super initWithFragmentShaderFromString:kGPUImageDirectionalSobelEdgeDetectionFragmentShaderString]))
+    {
+        return nil;
+    }
+
+    return self;
+}
+
+
+@end

LFLiveKit/Vendor/GPUImage/GPUImageDissolveBlendFilter.h

@@ -0,0 +1,11 @@
+#import "GPUImageTwoInputFilter.h"
+
+@interface GPUImageDissolveBlendFilter : GPUImageTwoInputFilter
+{
+    GLint mixUniform;
+}
+
+// Mix ranges from 0.0 (only image 1) to 1.0 (only image 2), with 0.5 (half of either) as the normal level
+@property(readwrite, nonatomic) CGFloat mix; 
+
+@end

LFLiveKit/Vendor/GPUImage/GPUImageDissolveBlendFilter.m

@@ -0,0 +1,72 @@
+#import "GPUImageDissolveBlendFilter.h"
+
+#if TARGET_IPHONE_SIMULATOR || TARGET_OS_IPHONE
+NSString *const kGPUImageDissolveBlendFragmentShaderString = SHADER_STRING
+(
+ varying highp vec2 textureCoordinate;
+ varying highp vec2 textureCoordinate2;
+
+ uniform sampler2D inputImageTexture;
+ uniform sampler2D inputImageTexture2;
+ uniform lowp float mixturePercent;
+ 
+ void main()
+ {
+    lowp vec4 textureColor = texture2D(inputImageTexture, textureCoordinate);
+    lowp vec4 textureColor2 = texture2D(inputImageTexture2, textureCoordinate2);
+    
+    gl_FragColor = mix(textureColor, textureColor2, mixturePercent);
+ }
+);
+#else
+NSString *const kGPUImageDissolveBlendFragmentShaderString = SHADER_STRING
+(
+ varying vec2 textureCoordinate;
+ varying vec2 textureCoordinate2;
+ 
+ uniform sampler2D inputImageTexture;
+ uniform sampler2D inputImageTexture2;
+ uniform float mixturePercent;
+ 
+ void main()
+ {
+     vec4 textureColor = texture2D(inputImageTexture, textureCoordinate);
+     vec4 textureColor2 = texture2D(inputImageTexture2, textureCoordinate2);
+     
+     gl_FragColor = mix(textureColor, textureColor2, mixturePercent);
+ }
+);
+#endif
+
+@implementation GPUImageDissolveBlendFilter
+
+@synthesize mix = _mix;
+
+#pragma mark -
+#pragma mark Initialization and teardown
+
+- (id)init;
+{
+    if (!(self = [super initWithFragmentShaderFromString:kGPUImageDissolveBlendFragmentShaderString]))
+    {
+		return nil;
+    }
+    
+    mixUniform = [filterProgram uniformIndex:@"mixturePercent"];
+    self.mix = 0.5;
+    
+    return self;
+}
+
+#pragma mark -
+#pragma mark Accessors
+
+- (void)setMix:(CGFloat)newValue;
+{
+    _mix = newValue;
+    
+    [self setFloat:_mix forUniform:mixUniform program:filterProgram];
+}
+
+@end
+

LFLiveKit/Vendor/GPUImage/GPUImageDivideBlendFilter.h

@@ -0,0 +1,5 @@
+#import "GPUImageTwoInputFilter.h"
+
+@interface GPUImageDivideBlendFilter : GPUImageTwoInputFilter
+
+@end

LFLiveKit/Vendor/GPUImage/GPUImageDivideBlendFilter.m

@@ -0,0 +1,96 @@
+#import "GPUImageDivideBlendFilter.h"
+
+#if TARGET_IPHONE_SIMULATOR || TARGET_OS_IPHONE
+NSString *const kGPUImageDivideBlendFragmentShaderString = SHADER_STRING
+(
+ varying highp vec2 textureCoordinate;
+ varying highp vec2 textureCoordinate2;
+
+ uniform sampler2D inputImageTexture;
+ uniform sampler2D inputImageTexture2;
+ 
+ void main()
+ {
+	 mediump vec4 base = texture2D(inputImageTexture, textureCoordinate);
+	 mediump vec4 overlay = texture2D(inputImageTexture2, textureCoordinate2);
+   
+   mediump float ra;
+   if (overlay.a == 0.0 || ((base.r / overlay.r) > (base.a / overlay.a)))
+     ra = overlay.a * base.a + overlay.r * (1.0 - base.a) + base.r * (1.0 - overlay.a);
+   else
+     ra = (base.r * overlay.a * overlay.a) / overlay.r + overlay.r * (1.0 - base.a) + base.r * (1.0 - overlay.a);
+   
+
+   mediump float ga;
+   if (overlay.a == 0.0 || ((base.g / overlay.g) > (base.a / overlay.a)))
+     ga = overlay.a * base.a + overlay.g * (1.0 - base.a) + base.g * (1.0 - overlay.a);
+   else
+     ga = (base.g * overlay.a * overlay.a) / overlay.g + overlay.g * (1.0 - base.a) + base.g * (1.0 - overlay.a);
+
+   
+   mediump float ba;
+   if (overlay.a == 0.0 || ((base.b / overlay.b) > (base.a / overlay.a)))
+     ba = overlay.a * base.a + overlay.b * (1.0 - base.a) + base.b * (1.0 - overlay.a);
+   else
+     ba = (base.b * overlay.a * overlay.a) / overlay.b + overlay.b * (1.0 - base.a) + base.b * (1.0 - overlay.a);
+
+   mediump float a = overlay.a + base.a - overlay.a * base.a;
+   
+	 gl_FragColor = vec4(ra, ga, ba, a);
+ }
+);
+#else
+NSString *const kGPUImageDivideBlendFragmentShaderString = SHADER_STRING
+(
+ varying vec2 textureCoordinate;
+ varying vec2 textureCoordinate2;
+ 
+ uniform sampler2D inputImageTexture;
+ uniform sampler2D inputImageTexture2;
+ 
+ void main()
+ {
+	 vec4 base = texture2D(inputImageTexture, textureCoordinate);
+	 vec4 overlay = texture2D(inputImageTexture2, textureCoordinate2);
+     
+     float ra;
+     if (overlay.a == 0.0 || ((base.r / overlay.r) > (base.a / overlay.a)))
+         ra = overlay.a * base.a + overlay.r * (1.0 - base.a) + base.r * (1.0 - overlay.a);
+     else
+         ra = (base.r * overlay.a * overlay.a) / overlay.r + overlay.r * (1.0 - base.a) + base.r * (1.0 - overlay.a);
+     
+     
+     float ga;
+     if (overlay.a == 0.0 || ((base.g / overlay.g) > (base.a / overlay.a)))
+         ga = overlay.a * base.a + overlay.g * (1.0 - base.a) + base.g * (1.0 - overlay.a);
+     else
+         ga = (base.g * overlay.a * overlay.a) / overlay.g + overlay.g * (1.0 - base.a) + base.g * (1.0 - overlay.a);
+     
+     
+     float ba;
+     if (overlay.a == 0.0 || ((base.b / overlay.b) > (base.a / overlay.a)))
+         ba = overlay.a * base.a + overlay.b * (1.0 - base.a) + base.b * (1.0 - overlay.a);
+     else
+         ba = (base.b * overlay.a * overlay.a) / overlay.b + overlay.b * (1.0 - base.a) + base.b * (1.0 - overlay.a);
+     
+     float a = overlay.a + base.a - overlay.a * base.a;
+     
+	 gl_FragColor = vec4(ra, ga, ba, a);
+ }
+ );
+#endif
+
+@implementation GPUImageDivideBlendFilter
+
+- (id)init;
+{
+    if (!(self = [super initWithFragmentShaderFromString:kGPUImageDivideBlendFragmentShaderString]))
+    {
+		return nil;
+    }
+    
+    return self;
+}
+
+@end
+

LFLiveKit/Vendor/GPUImage/GPUImageEmbossFilter.h

@@ -0,0 +1,8 @@
+#import "GPUImage3x3ConvolutionFilter.h"
+
+@interface GPUImageEmbossFilter : GPUImage3x3ConvolutionFilter
+
+// The strength of the embossing, from  0.0 to 4.0, with 1.0 as the normal level
+@property(readwrite, nonatomic) CGFloat intensity; 
+
+@end

LFLiveKit/Vendor/GPUImage/GPUImageEmbossFilter.m

@@ -0,0 +1,49 @@
+#import "GPUImageEmbossFilter.h"
+
+@implementation GPUImageEmbossFilter
+
+@synthesize intensity = _intensity; 
+
+- (id)init;
+{
+    if (!(self = [super init]))
+    {
+		return nil;
+    }
+    
+    self.intensity = 1.0;
+    
+    return self;
+}
+
+#pragma mark -
+#pragma mark Accessors
+
+- (void)setIntensity:(CGFloat)newValue;
+{
+//    [(GPUImage3x3ConvolutionFilter *)filter setConvolutionMatrix:(GPUMatrix3x3){
+//        {-2.0f, -1.0f, 0.0f},
+//        {-1.0f,  1.0f, 1.0f},
+//        { 0.0f,  1.0f, 2.0f}
+//    }];
+    
+    _intensity = newValue;
+    
+    GPUMatrix3x3 newConvolutionMatrix;
+    newConvolutionMatrix.one.one = _intensity * (-2.0);
+    newConvolutionMatrix.one.two = -_intensity;    
+    newConvolutionMatrix.one.three = 0.0f;
+
+    newConvolutionMatrix.two.one = -_intensity;
+    newConvolutionMatrix.two.two = 1.0;    
+    newConvolutionMatrix.two.three = _intensity;
+    
+    newConvolutionMatrix.three.one = 0.0f;
+    newConvolutionMatrix.three.two = _intensity;    
+    newConvolutionMatrix.three.three = _intensity * 2.0;
+
+    self.convolutionKernel = newConvolutionMatrix;
+}
+
+
+@end

LFLiveKit/Vendor/GPUImage/GPUImageErosionFilter.h

@@ -0,0 +1,11 @@
+#import "GPUImageTwoPassTextureSamplingFilter.h"
+
+// For each pixel, this sets it to the minimum value of the red channel in a rectangular neighborhood extending out dilationRadius pixels from the center.
+// This extends out dark features, and is most commonly used with black-and-white thresholded images.
+
+@interface GPUImageErosionFilter : GPUImageTwoPassTextureSamplingFilter
+
+// Acceptable values for erosionRadius, which sets the distance in pixels to sample out from the center, are 1, 2, 3, and 4.
+- (id)initWithRadius:(NSUInteger)erosionRadius;
+
+@end

LFLiveKit/Vendor/GPUImage/GPUImageErosionFilter.m

@@ -0,0 +1,312 @@
+#import "GPUImageErosionFilter.h"
+#import "GPUImageDilationFilter.h"
+
+@implementation GPUImageErosionFilter
+
+#if TARGET_IPHONE_SIMULATOR || TARGET_OS_IPHONE
+NSString *const kGPUImageErosionRadiusOneFragmentShaderString = SHADER_STRING
+(
+ precision lowp float;
+ 
+ varying vec2 centerTextureCoordinate;
+ varying vec2 oneStepPositiveTextureCoordinate;
+ varying vec2 oneStepNegativeTextureCoordinate;
+ 
+ uniform sampler2D inputImageTexture;
+ 
+ void main()
+ {
+     float centerIntensity = texture2D(inputImageTexture, centerTextureCoordinate).r;
+     float oneStepPositiveIntensity = texture2D(inputImageTexture, oneStepPositiveTextureCoordinate).r;
+     float oneStepNegativeIntensity = texture2D(inputImageTexture, oneStepNegativeTextureCoordinate).r;
+     
+     lowp float minValue = min(centerIntensity, oneStepPositiveIntensity);
+     minValue = min(minValue, oneStepNegativeIntensity);
+     
+     gl_FragColor = vec4(vec3(minValue), 1.0);
+ }
+);
+
+NSString *const kGPUImageErosionRadiusTwoFragmentShaderString = SHADER_STRING
+(
+ precision lowp float;
+ 
+ varying vec2 centerTextureCoordinate;
+ varying vec2 oneStepPositiveTextureCoordinate;
+ varying vec2 oneStepNegativeTextureCoordinate;
+ varying vec2 twoStepsPositiveTextureCoordinate;
+ varying vec2 twoStepsNegativeTextureCoordinate;
+ 
+ uniform sampler2D inputImageTexture;
+ 
+ void main()
+ {
+     float centerIntensity = texture2D(inputImageTexture, centerTextureCoordinate).r;
+     float oneStepPositiveIntensity = texture2D(inputImageTexture, oneStepPositiveTextureCoordinate).r;
+     float oneStepNegativeIntensity = texture2D(inputImageTexture, oneStepNegativeTextureCoordinate).r;
+     float twoStepsPositiveIntensity = texture2D(inputImageTexture, twoStepsPositiveTextureCoordinate).r;
+     float twoStepsNegativeIntensity = texture2D(inputImageTexture, twoStepsNegativeTextureCoordinate).r;
+     
+     lowp float minValue = min(centerIntensity, oneStepPositiveIntensity);
+     minValue = min(minValue, oneStepNegativeIntensity);
+     minValue = min(minValue, twoStepsPositiveIntensity);
+     minValue = min(minValue, twoStepsNegativeIntensity);
+     
+     gl_FragColor = vec4(vec3(minValue), 1.0);
+ }
+);
+
+NSString *const kGPUImageErosionRadiusThreeFragmentShaderString = SHADER_STRING
+(
+ precision lowp float;
+ 
+ varying vec2 centerTextureCoordinate;
+ varying vec2 oneStepPositiveTextureCoordinate;
+ varying vec2 oneStepNegativeTextureCoordinate;
+ varying vec2 twoStepsPositiveTextureCoordinate;
+ varying vec2 twoStepsNegativeTextureCoordinate;
+ varying vec2 threeStepsPositiveTextureCoordinate;
+ varying vec2 threeStepsNegativeTextureCoordinate;
+ 
+ uniform sampler2D inputImageTexture;
+ 
+ void main()
+ {
+     float centerIntensity = texture2D(inputImageTexture, centerTextureCoordinate).r;
+     float oneStepPositiveIntensity = texture2D(inputImageTexture, oneStepPositiveTextureCoordinate).r;
+     float oneStepNegativeIntensity = texture2D(inputImageTexture, oneStepNegativeTextureCoordinate).r;
+     float twoStepsPositiveIntensity = texture2D(inputImageTexture, twoStepsPositiveTextureCoordinate).r;
+     float twoStepsNegativeIntensity = texture2D(inputImageTexture, twoStepsNegativeTextureCoordinate).r;
+     float threeStepsPositiveIntensity = texture2D(inputImageTexture, threeStepsPositiveTextureCoordinate).r;
+     float threeStepsNegativeIntensity = texture2D(inputImageTexture, threeStepsNegativeTextureCoordinate).r;
+     
+     lowp float minValue = min(centerIntensity, oneStepPositiveIntensity);
+     minValue = min(minValue, oneStepNegativeIntensity);
+     minValue = min(minValue, twoStepsPositiveIntensity);
+     minValue = min(minValue, twoStepsNegativeIntensity);
+     minValue = min(minValue, threeStepsPositiveIntensity);
+     minValue = min(minValue, threeStepsNegativeIntensity);
+     
+     gl_FragColor = vec4(vec3(minValue), 1.0);
+ }
+);
+
+NSString *const kGPUImageErosionRadiusFourFragmentShaderString = SHADER_STRING
+(
+ precision lowp float;
+ 
+ varying vec2 centerTextureCoordinate;
+ varying vec2 oneStepPositiveTextureCoordinate;
+ varying vec2 oneStepNegativeTextureCoordinate;
+ varying vec2 twoStepsPositiveTextureCoordinate;
+ varying vec2 twoStepsNegativeTextureCoordinate;
+ varying vec2 threeStepsPositiveTextureCoordinate;
+ varying vec2 threeStepsNegativeTextureCoordinate;
+ varying vec2 fourStepsPositiveTextureCoordinate;
+ varying vec2 fourStepsNegativeTextureCoordinate;
+ 
+ uniform sampler2D inputImageTexture;
+ 
+ void main()
+ {
+     float centerIntensity = texture2D(inputImageTexture, centerTextureCoordinate).r;
+     float oneStepPositiveIntensity = texture2D(inputImageTexture, oneStepPositiveTextureCoordinate).r;
+     float oneStepNegativeIntensity = texture2D(inputImageTexture, oneStepNegativeTextureCoordinate).r;
+     float twoStepsPositiveIntensity = texture2D(inputImageTexture, twoStepsPositiveTextureCoordinate).r;
+     float twoStepsNegativeIntensity = texture2D(inputImageTexture, twoStepsNegativeTextureCoordinate).r;
+     float threeStepsPositiveIntensity = texture2D(inputImageTexture, threeStepsPositiveTextureCoordinate).r;
+     float threeStepsNegativeIntensity = texture2D(inputImageTexture, threeStepsNegativeTextureCoordinate).r;
+     float fourStepsPositiveIntensity = texture2D(inputImageTexture, fourStepsPositiveTextureCoordinate).r;
+     float fourStepsNegativeIntensity = texture2D(inputImageTexture, fourStepsNegativeTextureCoordinate).r;
+     
+     lowp float minValue = min(centerIntensity, oneStepPositiveIntensity);
+     minValue = min(minValue, oneStepNegativeIntensity);
+     minValue = min(minValue, twoStepsPositiveIntensity);
+     minValue = min(minValue, twoStepsNegativeIntensity);
+     minValue = min(minValue, threeStepsPositiveIntensity);
+     minValue = min(minValue, threeStepsNegativeIntensity);
+     minValue = min(minValue, fourStepsPositiveIntensity);
+     minValue = min(minValue, fourStepsNegativeIntensity);
+     
+     gl_FragColor = vec4(vec3(minValue), 1.0);
+ }
+);
+#else
+NSString *const kGPUImageErosionRadiusOneFragmentShaderString = SHADER_STRING
+(
+ varying vec2 centerTextureCoordinate;
+ varying vec2 oneStepPositiveTextureCoordinate;
+ varying vec2 oneStepNegativeTextureCoordinate;
+ 
+ uniform sampler2D inputImageTexture;
+ 
+ void main()
+ {
+     float centerIntensity = texture2D(inputImageTexture, centerTextureCoordinate).r;
+     float oneStepPositiveIntensity = texture2D(inputImageTexture, oneStepPositiveTextureCoordinate).r;
+     float oneStepNegativeIntensity = texture2D(inputImageTexture, oneStepNegativeTextureCoordinate).r;
+     
+     float minValue = min(centerIntensity, oneStepPositiveIntensity);
+     minValue = min(minValue, oneStepNegativeIntensity);
+     
+     gl_FragColor = vec4(vec3(minValue), 1.0);
+ }
+);
+
+NSString *const kGPUImageErosionRadiusTwoFragmentShaderString = SHADER_STRING
+(
+ varying vec2 centerTextureCoordinate;
+ varying vec2 oneStepPositiveTextureCoordinate;
+ varying vec2 oneStepNegativeTextureCoordinate;
+ varying vec2 twoStepsPositiveTextureCoordinate;
+ varying vec2 twoStepsNegativeTextureCoordinate;
+ 
+ uniform sampler2D inputImageTexture;
+ 
+ void main()
+ {
+     float centerIntensity = texture2D(inputImageTexture, centerTextureCoordinate).r;
+     float oneStepPositiveIntensity = texture2D(inputImageTexture, oneStepPositiveTextureCoordinate).r;
+     float oneStepNegativeIntensity = texture2D(inputImageTexture, oneStepNegativeTextureCoordinate).r;
+     float twoStepsPositiveIntensity = texture2D(inputImageTexture, twoStepsPositiveTextureCoordinate).r;
+     float twoStepsNegativeIntensity = texture2D(inputImageTexture, twoStepsNegativeTextureCoordinate).r;
+     
+     float minValue = min(centerIntensity, oneStepPositiveIntensity);
+     minValue = min(minValue, oneStepNegativeIntensity);
+     minValue = min(minValue, twoStepsPositiveIntensity);
+     minValue = min(minValue, twoStepsNegativeIntensity);
+     
+     gl_FragColor = vec4(vec3(minValue), 1.0);
+ }
+);
+
+NSString *const kGPUImageErosionRadiusThreeFragmentShaderString = SHADER_STRING
+(
+ varying vec2 centerTextureCoordinate;
+ varying vec2 oneStepPositiveTextureCoordinate;
+ varying vec2 oneStepNegativeTextureCoordinate;
+ varying vec2 twoStepsPositiveTextureCoordinate;
+ varying vec2 twoStepsNegativeTextureCoordinate;
+ varying vec2 threeStepsPositiveTextureCoordinate;
+ varying vec2 threeStepsNegativeTextureCoordinate;
+ 
+ uniform sampler2D inputImageTexture;
+ 
+ void main()
+ {
+     float centerIntensity = texture2D(inputImageTexture, centerTextureCoordinate).r;
+     float oneStepPositiveIntensity = texture2D(inputImageTexture, oneStepPositiveTextureCoordinate).r;
+     float oneStepNegativeIntensity = texture2D(inputImageTexture, oneStepNegativeTextureCoordinate).r;
+     float twoStepsPositiveIntensity = texture2D(inputImageTexture, twoStepsPositiveTextureCoordinate).r;
+     float twoStepsNegativeIntensity = texture2D(inputImageTexture, twoStepsNegativeTextureCoordinate).r;
+     float threeStepsPositiveIntensity = texture2D(inputImageTexture, threeStepsPositiveTextureCoordinate).r;
+     float threeStepsNegativeIntensity = texture2D(inputImageTexture, threeStepsNegativeTextureCoordinate).r;
+     
+     float minValue = min(centerIntensity, oneStepPositiveIntensity);
+     minValue = min(minValue, oneStepNegativeIntensity);
+     minValue = min(minValue, twoStepsPositiveIntensity);
+     minValue = min(minValue, twoStepsNegativeIntensity);
+     minValue = min(minValue, threeStepsPositiveIntensity);
+     minValue = min(minValue, threeStepsNegativeIntensity);
+     
+     gl_FragColor = vec4(vec3(minValue), 1.0);
+ }
+);
+
+NSString *const kGPUImageErosionRadiusFourFragmentShaderString = SHADER_STRING
+(
+ varying vec2 centerTextureCoordinate;
+ varying vec2 oneStepPositiveTextureCoordinate;
+ varying vec2 oneStepNegativeTextureCoordinate;
+ varying vec2 twoStepsPositiveTextureCoordinate;
+ varying vec2 twoStepsNegativeTextureCoordinate;
+ varying vec2 threeStepsPositiveTextureCoordinate;
+ varying vec2 threeStepsNegativeTextureCoordinate;
+ varying vec2 fourStepsPositiveTextureCoordinate;
+ varying vec2 fourStepsNegativeTextureCoordinate;
+ 
+ uniform sampler2D inputImageTexture;
+ 
+ void main()
+ {
+     float centerIntensity = texture2D(inputImageTexture, centerTextureCoordinate).r;
+     float oneStepPositiveIntensity = texture2D(inputImageTexture, oneStepPositiveTextureCoordinate).r;
+     float oneStepNegativeIntensity = texture2D(inputImageTexture, oneStepNegativeTextureCoordinate).r;
+     float twoStepsPositiveIntensity = texture2D(inputImageTexture, twoStepsPositiveTextureCoordinate).r;
+     float twoStepsNegativeIntensity = texture2D(inputImageTexture, twoStepsNegativeTextureCoordinate).r;
+     float threeStepsPositiveIntensity = texture2D(inputImageTexture, threeStepsPositiveTextureCoordinate).r;
+     float threeStepsNegativeIntensity = texture2D(inputImageTexture, threeStepsNegativeTextureCoordinate).r;
+     float fourStepsPositiveIntensity = texture2D(inputImageTexture, fourStepsPositiveTextureCoordinate).r;
+     float fourStepsNegativeIntensity = texture2D(inputImageTexture, fourStepsNegativeTextureCoordinate).r;
+     
+     float minValue = min(centerIntensity, oneStepPositiveIntensity);
+     minValue = min(minValue, oneStepNegativeIntensity);
+     minValue = min(minValue, twoStepsPositiveIntensity);
+     minValue = min(minValue, twoStepsNegativeIntensity);
+     minValue = min(minValue, threeStepsPositiveIntensity);
+     minValue = min(minValue, threeStepsNegativeIntensity);
+     minValue = min(minValue, fourStepsPositiveIntensity);
+     minValue = min(minValue, fourStepsNegativeIntensity);
+     
+     gl_FragColor = vec4(vec3(minValue), 1.0);
+ }
+);
+#endif
+
+#pragma mark -
+#pragma mark Initialization and teardown
+
+- (id)initWithRadius:(NSUInteger)dilationRadius;
+{    
+    NSString *fragmentShaderForThisRadius = nil;
+    NSString *vertexShaderForThisRadius = nil;
+    
+    switch (dilationRadius)
+    {
+        case 0:
+        case 1:
+        {
+            vertexShaderForThisRadius = kGPUImageDilationRadiusOneVertexShaderString;
+            fragmentShaderForThisRadius = kGPUImageErosionRadiusOneFragmentShaderString;
+        }; break;
+        case 2:
+        {
+            vertexShaderForThisRadius = kGPUImageDilationRadiusTwoVertexShaderString;
+            fragmentShaderForThisRadius = kGPUImageErosionRadiusTwoFragmentShaderString;
+        }; break;
+        case 3:
+        {
+            vertexShaderForThisRadius = kGPUImageDilationRadiusThreeVertexShaderString;
+            fragmentShaderForThisRadius = kGPUImageErosionRadiusThreeFragmentShaderString;
+        }; break;
+        case 4:
+        {
+            vertexShaderForThisRadius = kGPUImageDilationRadiusFourVertexShaderString;
+            fragmentShaderForThisRadius = kGPUImageErosionRadiusFourFragmentShaderString;
+        }; break;
+        default:
+        {
+            vertexShaderForThisRadius = kGPUImageDilationRadiusFourVertexShaderString;
+            fragmentShaderForThisRadius = kGPUImageErosionRadiusFourFragmentShaderString;
+        }; break;
+    }
+    
+    if (!(self = [super initWithFirstStageVertexShaderFromString:vertexShaderForThisRadius firstStageFragmentShaderFromString:fragmentShaderForThisRadius secondStageVertexShaderFromString:vertexShaderForThisRadius secondStageFragmentShaderFromString:fragmentShaderForThisRadius]))
+    {
+        return nil;
+    }
+    
+    return self;
+}
+
+- (id)init;
+{
+    if (!(self = [self initWithRadius:1]))
+    {
+        return nil;
+    }
+    
+    return self;
+}
+
+@end

LFLiveKit/Vendor/GPUImage/GPUImageExclusionBlendFilter.h

@@ -0,0 +1,7 @@
+#import "GPUImageTwoInputFilter.h"
+
+@interface GPUImageExclusionBlendFilter : GPUImageTwoInputFilter
+{
+}
+
+@end

LFLiveKit/Vendor/GPUImage/GPUImageExclusionBlendFilter.m

@@ -0,0 +1,56 @@
+#import "GPUImageExclusionBlendFilter.h"
+
+#if TARGET_IPHONE_SIMULATOR || TARGET_OS_IPHONE
+NSString *const kGPUImageExclusionBlendFragmentShaderString = SHADER_STRING
+(
+ varying highp vec2 textureCoordinate;
+ varying highp vec2 textureCoordinate2;
+
+ uniform sampler2D inputImageTexture;
+ uniform sampler2D inputImageTexture2;
+ 
+ void main()
+ {
+     mediump vec4 base = texture2D(inputImageTexture, textureCoordinate);
+     mediump vec4 overlay = texture2D(inputImageTexture2, textureCoordinate2);
+     
+     //     Dca = (Sca.Da + Dca.Sa - 2.Sca.Dca) + Sca.(1 - Da) + Dca.(1 - Sa)
+     
+     gl_FragColor = vec4((overlay.rgb * base.a + base.rgb * overlay.a - 2.0 * overlay.rgb * base.rgb) + overlay.rgb * (1.0 - base.a) + base.rgb * (1.0 - overlay.a), base.a);
+ }
+);
+#else
+NSString *const kGPUImageExclusionBlendFragmentShaderString = SHADER_STRING
+(
+ varying vec2 textureCoordinate;
+ varying vec2 textureCoordinate2;
+ 
+ uniform sampler2D inputImageTexture;
+ uniform sampler2D inputImageTexture2;
+ 
+ void main()
+ {
+     vec4 base = texture2D(inputImageTexture, textureCoordinate);
+     vec4 overlay = texture2D(inputImageTexture2, textureCoordinate2);
+     
+     //     Dca = (Sca.Da + Dca.Sa - 2.Sca.Dca) + Sca.(1 - Da) + Dca.(1 - Sa)
+     
+     gl_FragColor = vec4((overlay.rgb * base.a + base.rgb * overlay.a - 2.0 * overlay.rgb * base.rgb) + overlay.rgb * (1.0 - base.a) + base.rgb * (1.0 - overlay.a), base.a);
+ }
+ );
+#endif
+
+@implementation GPUImageExclusionBlendFilter
+
+- (id)init;
+{
+    if (!(self = [super initWithFragmentShaderFromString:kGPUImageExclusionBlendFragmentShaderString]))
+    {
+		return nil;
+    }
+    
+    return self;
+}
+
+@end
+

LFLiveKit/Vendor/GPUImage/GPUImageExposureFilter.h

@@ -0,0 +1,11 @@
+#import "GPUImageFilter.h"
+
+@interface GPUImageExposureFilter : GPUImageFilter
+{
+    GLint exposureUniform;
+}
+
+// Exposure ranges from -10.0 to 10.0, with 0.0 as the normal level
+@property(readwrite, nonatomic) CGFloat exposure; 
+
+@end

LFLiveKit/Vendor/GPUImage/GPUImageExposureFilter.m

@@ -0,0 +1,66 @@
+#import "GPUImageExposureFilter.h"
+
+#if TARGET_IPHONE_SIMULATOR || TARGET_OS_IPHONE
+NSString *const kGPUImageExposureFragmentShaderString = SHADER_STRING
+(
+ varying highp vec2 textureCoordinate;
+ 
+ uniform sampler2D inputImageTexture;
+ uniform highp float exposure;
+ 
+ void main()
+ {
+     highp vec4 textureColor = texture2D(inputImageTexture, textureCoordinate);
+     
+     gl_FragColor = vec4(textureColor.rgb * pow(2.0, exposure), textureColor.w);
+ }
+);
+#else
+NSString *const kGPUImageExposureFragmentShaderString = SHADER_STRING
+(
+ varying vec2 textureCoordinate;
+ 
+ uniform sampler2D inputImageTexture;
+ uniform float exposure;
+ 
+ void main()
+ {
+     vec4 textureColor = texture2D(inputImageTexture, textureCoordinate);
+     
+     gl_FragColor = vec4(textureColor.rgb * pow(2.0, exposure), textureColor.w);
+ }
+);
+#endif
+
+@implementation GPUImageExposureFilter
+
+@synthesize exposure = _exposure;
+
+#pragma mark -
+#pragma mark Initialization and teardown
+
+- (id)init;
+{
+    if (!(self = [super initWithFragmentShaderFromString:kGPUImageExposureFragmentShaderString]))
+    {
+		return nil;
+    }
+    
+    exposureUniform = [filterProgram uniformIndex:@"exposure"];
+    self.exposure = 0.0;
+    
+    return self;
+}
+
+#pragma mark -
+#pragma mark Accessors
+
+- (void)setExposure:(CGFloat)newValue;
+{
+    _exposure = newValue;
+    
+    [self setFloat:_exposure forUniform:exposureUniform program:filterProgram];
+}
+
+@end
+

LFLiveKit/Vendor/GPUImage/GPUImageFASTCornerDetectionFilter.h

@@ -0,0 +1,33 @@
+#import "GPUImageFilterGroup.h"
+
+@class GPUImageGrayscaleFilter;
+@class GPUImage3x3TextureSamplingFilter;
+@class GPUImageNonMaximumSuppressionFilter;
+
+/* 
+ An implementation of the Features from Accelerated Segment Test (FAST) feature detector as described in the following publications:
+ 
+ E. Rosten and T. Drummond. Fusing points and lines for high performance tracking. IEEE International Conference on Computer Vision, 2005.
+ E. Rosten and T. Drummond. Machine learning for high-speed corner detection.  European Conference on Computer Vision, 2006.
+ 
+ For more about the FAST feature detector, see the resources here:
+ http://www.edwardrosten.com/work/fast.html
+ */
+
+typedef enum { kGPUImageFAST12Contiguous, kGPUImageFAST12ContiguousNonMaximumSuppressed} GPUImageFASTDetectorType;
+
+@interface GPUImageFASTCornerDetectionFilter : GPUImageFilterGroup
+{
+    GPUImageGrayscaleFilter *luminanceReductionFilter;
+    GPUImage3x3TextureSamplingFilter *featureDetectionFilter;
+    GPUImageNonMaximumSuppressionFilter *nonMaximumSuppressionFilter;
+// Generate a lookup texture based on the bit patterns
+    
+// Step 1: convert to monochrome if necessary
+// Step 2: do a lookup at each pixel based on the Bresenham circle, encode comparison in two color components
+// Step 3: do non-maximum suppression of close corner points
+}
+
+- (id)initWithFASTDetectorVariant:(GPUImageFASTDetectorType)detectorType;
+
+@end