Release 4.1.0

Merge Fix PCM memory leak #87
fix PCM memory leak
2021-03-22 23:04:53 -07:00 · 2021-03-22 23:01:35 -07:00 · 2021-03-22 23:00:35 -07:00 · 2021-03-22 22:49:31 -07:00 · 2021-03-22 11:52:29 -07:00 · 2021-03-22 11:50:53 -07:00
37 changed files with 1402 additions and 349 deletions
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-		A49B78C3221A78DE00BBA862 /* DownloadProgressDirector.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = DownloadProgressDirector.swift; sourceTree = "<group>"; };
+		A470FE0625F9ADF800F135FF /* AudioClockDirector.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = AudioClockDirector.swift; sourceTree = "<group>"; };
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 				A4681F892200DB3C0018AB51 /* Date.swift */,
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@@ -295,6 +304,7 @@
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@@ -348,20 +358,30 @@
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-				A49B78C3221A78DE00BBA862 /* DownloadProgressDirector.swift */,
 				A4681F932200E2020018AB51 /* Engine */,
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 				A4681F842200D91D0018AB51 /* Util */,
 			);
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+				A470FE0625F9ADF800F135FF /* AudioClockDirector.swift */,
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+			sourceTree = "<group>";
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@@ -538,16 +562,17 @@
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 				A4681FE0220113E40018AB51 /* Log.swift in Sources */,
 				A4681FCE220113A20018AB51 /* AudioConverter.swift in Sources */,
+				A470FE0825F9ADF800F135FF /* AudioClockDirector.swift in Sources */,
 				A4FBA6B9221BAF8700D5A353 /* SAAudioAvailabilityRange.swift in Sources */,
 				A4681FCD2201139E0018AB51 /* AudioStreamEngine.swift in Sources */,
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 				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
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+				SWIFT_VERSION = 5.0;
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 				SWIFT_ACTIVE_COMPILATION_CONDITIONS = "$(inherited) ";
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 				TARGETED_DEVICE_FAMILY = "1,2";
 				VALIDATE_PRODUCT = YES;
 				VERSIONING_SYSTEM = "apple-generic";
@@ -0,0 +1,7 @@
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 				607FACD51AFB9204008FA782 /* AppDelegate.swift */,
 				607FACD71AFB9204008FA782 /* ViewController.swift */,
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 				607FACD91AFB9204008FA782 /* Main.storyboard */,
 				607FACDC1AFB9204008FA782 /* Images.xcassets */,
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 					607FACE41AFB9204008FA782 = {
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 			buildConfigurationList = 607FACCB1AFB9204008FA782 /* Build configuration list for PBXProject "SwiftAudioPlayer" */;
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@@ -324,6 +327,7 @@
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-				DEVELOPMENT_TEAM = R2392A68YQ;
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-				PRODUCT_BUNDLE_IDENTIFIER = "org.cocoapods.demo.$(PRODUCT_NAME:rfc1034identifier)";
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-				SWIFT_VERSION = 4.2;
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-				DEVELOPMENT_TEAM = R2392A68YQ;
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 				MODULE_NAME = ExampleApp;
-				PRODUCT_BUNDLE_IDENTIFIER = "org.cocoapods.demo.$(PRODUCT_NAME:rfc1034identifier)";
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 					"$(SDKROOT)/Developer/Library/Frameworks",
 					"$(inherited)",
@@ -517,7 +521,7 @@
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks @loader_path/Frameworks";
 				PRODUCT_BUNDLE_IDENTIFIER = "org.cocoapods.$(PRODUCT_NAME:rfc1034identifier)";
 				PRODUCT_NAME = "$(TARGET_NAME)";
-				SWIFT_VERSION = 4.2;
+				SWIFT_VERSION = 5.0;
 				TEST_HOST = "$(BUILT_PRODUCTS_DIR)/SwiftAudioPlayer_Example.app/SwiftAudioPlayer_Example";
 			};
 			name = Debug;
@@ -526,7 +530,7 @@
 			isa = XCBuildConfiguration;
 			baseConfigurationReference = 0B7D1E6C00E83B4AF8AA1781 /* Pods-SwiftAudioPlayer_Tests.release.xcconfig */;
 			buildSettings = {
-				DEVELOPMENT_TEAM = R2392A68YQ;
+				DEVELOPMENT_TEAM = H9Y26B6GZB;
 				FRAMEWORK_SEARCH_PATHS = (
 					"$(SDKROOT)/Developer/Library/Frameworks",
 					"$(inherited)",
@@ -535,7 +539,7 @@
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks @loader_path/Frameworks";
 				PRODUCT_BUNDLE_IDENTIFIER = "org.cocoapods.$(PRODUCT_NAME:rfc1034identifier)";
 				PRODUCT_NAME = "$(TARGET_NAME)";
-				SWIFT_VERSION = 4.2;
+				SWIFT_VERSION = 5.0;
 				TEST_HOST = "$(BUILT_PRODUCTS_DIR)/SwiftAudioPlayer_Example.app/SwiftAudioPlayer_Example";
 			};
 			name = Release;
@@ -1,11 +1,9 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="14460.31" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" colorMatched="YES" initialViewController="vXZ-lx-hvc">
-    <device id="retina4_7" orientation="portrait">
-        <adaptation id="fullscreen"/>
-    </device>
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="17701" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" colorMatched="YES" initialViewController="vXZ-lx-hvc">
+    <device id="retina4_7" orientation="portrait" appearance="light"/>
    <dependencies>
        <deployment identifier="iOS"/>
-        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="14460.20"/>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="17703"/>
        <capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
    </dependencies>
    <scenes>
@@ -22,13 +20,13 @@
                        <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/>
                        <subviews>
                            <progressView opaque="NO" contentMode="scaleToFill" verticalHuggingPriority="750" translatesAutoresizingMaskIntoConstraints="NO" id="lTK-Hd-Tl2">
-                                <rect key="frame" x="16" y="320" width="343" height="2"/>
+                                <rect key="frame" x="16" y="303" width="343" height="4"/>
                                <color key="tintColor" white="0.0" alpha="0.0" colorSpace="custom" customColorSpace="genericGamma22GrayColorSpace"/>
                                <color key="progressTintColor" red="0.46202266219999999" green="0.83828371759999998" blue="1" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
                                <color key="trackTintColor" white="0.66666666666666663" alpha="1" colorSpace="custom" customColorSpace="genericGamma22GrayColorSpace"/>
                            </progressView>
                            <slider opaque="NO" contentMode="scaleToFill" verticalCompressionResistancePriority="749" contentHorizontalAlignment="center" contentVerticalAlignment="center" minValue="0.0" maxValue="1" translatesAutoresizingMaskIntoConstraints="NO" id="w2a-RA-zmI">
-                                <rect key="frame" x="14" y="305" width="347" height="31"/>
+                                <rect key="frame" x="14" y="289" width="347" height="31"/>
                                <color key="backgroundColor" white="0.0" alpha="0.0" colorSpace="custom" customColorSpace="genericGamma22GrayColorSpace"/>
                                <color key="maximumTrackTintColor" white="0.0" alpha="0.0" colorSpace="custom" customColorSpace="genericGamma22GrayColorSpace"/>
                                <connections>
@@ -37,41 +35,41 @@
                                    <action selector="scrubberStartedSeeking:" destination="vXZ-lx-hvc" eventType="touchDown" id="UXg-Wf-fKv"/>
                                </connections>
                            </slider>
-                            <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="jUc-tP-CC5">
-                                <rect key="frame" x="172.5" y="250" width="30" height="30"/>
+                            <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="system" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="jUc-tP-CC5">
+                                <rect key="frame" x="172.5" y="233" width="30" height="30"/>
                                <state key="normal" title="play"/>
                                <connections>
                                    <action selector="playPauseTouched:" destination="vXZ-lx-hvc" eventType="touchUpInside" id="Avk-K3-EZ7"/>
                                </connections>
                            </button>
-                            <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="tFH-sY-Xu9">
-                                <rect key="frame" x="62.5" y="250" width="30" height="30"/>
+                            <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="system" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="tFH-sY-Xu9">
+                                <rect key="frame" x="62.5" y="233" width="30" height="30"/>
                                <state key="normal" title="-15"/>
                                <connections>
                                    <action selector="skipBackwardTouched:" destination="vXZ-lx-hvc" eventType="touchUpInside" id="PCT-BE-udf"/>
                                </connections>
                            </button>
-                            <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="0QE-3F-a4G">
-                                <rect key="frame" x="282.5" y="250" width="30" height="30"/>
+                            <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="system" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="0QE-3F-a4G">
+                                <rect key="frame" x="282.5" y="233" width="30" height="30"/>
                                <state key="normal" title="+30"/>
                                <connections>
                                    <action selector="skipForwardTouched:" destination="vXZ-lx-hvc" eventType="touchUpInside" id="uXv-bz-tnt"/>
                                </connections>
                            </button>
                            <slider opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" value="1" minValue="0.10000000000000001" maxValue="32" translatesAutoresizingMaskIntoConstraints="NO" id="vfk-OJ-S3T">
-                                <rect key="frame" x="14" y="464" width="347" height="31"/>
+                                <rect key="frame" x="14" y="448" width="347" height="31"/>
                                <connections>
                                    <action selector="rateChanged:" destination="vXZ-lx-hvc" eventType="valueChanged" id="FDJ-jA-bm8"/>
                                </connections>
                            </slider>
                            <slider opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" value="300" minValue="0.10000000149011612" maxValue="1000" translatesAutoresizingMaskIntoConstraints="NO" id="nsl-df-P21">
-                                <rect key="frame" x="14" y="397" width="347" height="31"/>
+                                <rect key="frame" x="14" y="381" width="347" height="31"/>
                                <connections>
                                    <action selector="reverbChanged:" destination="vXZ-lx-hvc" eventType="valueChanged" id="J8Q-be-35q"/>
                                </connections>
                            </slider>
                            <segmentedControl opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="left" contentVerticalAlignment="top" segmentControlStyle="plain" selectedSegmentIndex="0" translatesAutoresizingMaskIntoConstraints="NO" id="joK-xi-MCo">
-                                <rect key="frame" x="16" y="80" width="343" height="29"/>
+                                <rect key="frame" x="16" y="60" width="343" height="32"/>
                                <segments>
                                    <segment title="Soundbite"/>
                                    <segment title="Acquired"/>
@@ -81,50 +79,85 @@
                                    <action selector="audioSelected:" destination="vXZ-lx-hvc" eventType="valueChanged" id="oYE-yq-348"/>
                                </connections>
                            </segmentedControl>
-                            <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="KDu-ea-kF8">
-                                <rect key="frame" x="78" y="140" width="69" height="30"/>
+                            <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="system" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="KDu-ea-kF8">
+                                <rect key="frame" x="43" y="123" width="69" height="30"/>
                                <state key="normal" title="Download"/>
                                <connections>
                                    <action selector="downloadTouched:" destination="vXZ-lx-hvc" eventType="touchUpInside" id="8Jg-1C-0Ms"/>
                                </connections>
                            </button>
-                            <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="6d9-Bc-hIz">
-                                <rect key="frame" x="244" y="140" width="49" height="30"/>
-                                <state key="normal" title="Stream"/>
-                                <connections>
-                                    <action selector="streamTouched:" destination="vXZ-lx-hvc" eventType="touchUpInside" id="AXY-N7-87Y"/>
-                                </connections>
-                            </button>
                            <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="rate: 1.0x" textAlignment="natural" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="yUQ-mI-ozK">
-                                <rect key="frame" x="153" y="435" width="69" height="21"/>
+                                <rect key="frame" x="153" y="419" width="69" height="21"/>
                                <fontDescription key="fontDescription" type="system" pointSize="17"/>
                                <nil key="textColor"/>
                                <nil key="highlightedColor"/>
                            </label>
                            <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="0:00" textAlignment="natural" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="j3w-gr-HzF">
-                                <rect key="frame" x="16" y="297" width="27" height="15"/>
+                                <rect key="frame" x="16" y="280" width="27" height="15"/>
                                <fontDescription key="fontDescription" type="system" pointSize="12"/>
                                <nil key="textColor"/>
                                <nil key="highlightedColor"/>
                            </label>
                            <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="100:00" textAlignment="natural" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="Urj-Dv-41y">
-                                <rect key="frame" x="319" y="297" width="40" height="15"/>
+                                <rect key="frame" x="319" y="280" width="40" height="15"/>
                                <fontDescription key="fontDescription" type="system" pointSize="12"/>
                                <nil key="textColor"/>
                                <nil key="highlightedColor"/>
                            </label>
                            <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="remote url: " textAlignment="center" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="1IX-z5-wWx">
-                                <rect key="frame" x="16" y="207" width="343" height="16"/>
+                                <rect key="frame" x="16" y="190" width="343" height="16"/>
                                <fontDescription key="fontDescription" type="system" pointSize="13"/>
                                <nil key="textColor"/>
                                <nil key="highlightedColor"/>
                            </label>
                            <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="reverb: 300.0" textAlignment="natural" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="y5i-MZ-Qat">
-                                <rect key="frame" x="136" y="368" width="103" height="21"/>
+                                <rect key="frame" x="136.5" y="352" width="102" height="21"/>
                                <fontDescription key="fontDescription" type="system" pointSize="17"/>
                                <nil key="textColor"/>
                                <nil key="highlightedColor"/>
                            </label>
+                            <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" fixedFrame="YES" text="Skip Silences" textAlignment="natural" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="M2y-FP-H1D">
+                                <rect key="frame" x="89" y="504" width="101" height="21"/>
+                                <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/>
+                                <fontDescription key="fontDescription" type="system" pointSize="17"/>
+                                <nil key="textColor"/>
+                                <nil key="highlightedColor"/>
+                            </label>
+                            <switch opaque="NO" contentMode="scaleToFill" horizontalHuggingPriority="750" verticalHuggingPriority="750" fixedFrame="YES" contentHorizontalAlignment="center" contentVerticalAlignment="center" translatesAutoresizingMaskIntoConstraints="NO" id="2cn-E5-TeQ">
+                                <rect key="frame" x="226" y="499" width="49" height="31"/>
+                                <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/>
+                                <connections>
+                                    <action selector="skipSilencesSwitched:" destination="vXZ-lx-hvc" eventType="valueChanged" id="p7X-Y8-7hO"/>
+                                </connections>
+                            </switch>
+                            <switch opaque="NO" contentMode="scaleToFill" horizontalHuggingPriority="750" verticalHuggingPriority="750" fixedFrame="YES" contentHorizontalAlignment="center" contentVerticalAlignment="center" translatesAutoresizingMaskIntoConstraints="NO" id="IGe-aU-Y6D">
+                                <rect key="frame" x="226" y="540" width="49" height="31"/>
+                                <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/>
+                                <connections>
+                                    <action selector="sleepSwitched:" destination="vXZ-lx-hvc" eventType="valueChanged" id="noa-m8-VHy"/>
+                                </connections>
+                            </switch>
+                            <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" fixedFrame="YES" text="Sleep After 5 s" textAlignment="natural" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="vf6-kr-yWa">
+                                <rect key="frame" x="83" y="545" width="112" height="21"/>
+                                <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/>
+                                <fontDescription key="fontDescription" type="system" pointSize="17"/>
+                                <nil key="textColor"/>
+                                <nil key="highlightedColor"/>
+                            </label>
+                            <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="system" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="pVf-cJ-9ca">
+                                <rect key="frame" x="164.5" y="123" width="46" height="30"/>
+                                <state key="normal" title="Queue"/>
+                                <connections>
+                                    <action selector="queueTouched:" destination="vXZ-lx-hvc" eventType="touchUpInside" id="qRj-oT-AV1"/>
+                                </connections>
+                            </button>
+                            <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="system" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="6d9-Bc-hIz">
+                                <rect key="frame" x="282" y="123" width="49" height="30"/>
+                                <state key="normal" title="Stream"/>
+                                <connections>
+                                    <action selector="streamTouched:" destination="vXZ-lx-hvc" eventType="touchUpInside" id="AXY-N7-87Y"/>
+                                </connections>
+                            </button>
                        </subviews>
                        <color key="backgroundColor" red="1" green="1" blue="1" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
                        <constraints>
@@ -137,13 +170,14 @@
                            <constraint firstItem="vfk-OJ-S3T" firstAttribute="trailing" secondItem="lTK-Hd-Tl2" secondAttribute="trailing" id="8PP-Pp-1Hc"/>
                            <constraint firstItem="joK-xi-MCo" firstAttribute="trailing" secondItem="lTK-Hd-Tl2" secondAttribute="trailing" id="AH1-Uu-eLB"/>
                            <constraint firstItem="joK-xi-MCo" firstAttribute="top" secondItem="jyV-Pf-zRb" secondAttribute="bottom" constant="60" id="Ba7-nd-oCD"/>
+                            <constraint firstItem="pVf-cJ-9ca" firstAttribute="centerY" secondItem="KDu-ea-kF8" secondAttribute="centerY" id="Cma-VU-v2t"/>
                            <constraint firstItem="Urj-Dv-41y" firstAttribute="centerY" secondItem="j3w-gr-HzF" secondAttribute="centerY" id="Fvd-7V-Rr8"/>
                            <constraint firstItem="1IX-z5-wWx" firstAttribute="leading" secondItem="joK-xi-MCo" secondAttribute="leading" id="GeX-7f-jzu"/>
                            <constraint firstItem="0QE-3F-a4G" firstAttribute="leading" relation="greaterThanOrEqual" secondItem="jUc-tP-CC5" secondAttribute="trailing" constant="8" symbolic="YES" id="JP5-yW-eVB"/>
                            <constraint firstItem="yUQ-mI-ozK" firstAttribute="top" secondItem="w2a-RA-zmI" secondAttribute="bottom" constant="100" id="K1K-8N-SpD"/>
                            <constraint firstItem="vfk-OJ-S3T" firstAttribute="leading" secondItem="lTK-Hd-Tl2" secondAttribute="leading" id="NOY-IO-NIJ"/>
                            <constraint firstItem="tFH-sY-Xu9" firstAttribute="centerY" secondItem="jUc-tP-CC5" secondAttribute="centerY" id="Rre-EY-kVY"/>
-                            <constraint firstItem="KDu-ea-kF8" firstAttribute="leading" secondItem="kh9-bI-dsS" secondAttribute="leading" constant="78" id="SRU-sX-z5b"/>
+                            <constraint firstItem="KDu-ea-kF8" firstAttribute="leading" secondItem="kh9-bI-dsS" secondAttribute="leading" constant="43" id="SRU-sX-z5b"/>
                            <constraint firstItem="w2a-RA-zmI" firstAttribute="trailing" secondItem="lTK-Hd-Tl2" secondAttribute="trailing" id="Vki-IZ-AdN"/>
                            <constraint firstItem="lTK-Hd-Tl2" firstAttribute="top" secondItem="j3w-gr-HzF" secondAttribute="bottom" constant="8" id="Wwx-Uo-yIC"/>
                            <constraint firstItem="nsl-df-P21" firstAttribute="leading" secondItem="vfk-OJ-S3T" secondAttribute="leading" id="a5C-nZ-8Jc"/>
@@ -159,12 +193,13 @@
                            <constraint firstItem="Urj-Dv-41y" firstAttribute="leading" relation="greaterThanOrEqual" secondItem="j3w-gr-HzF" secondAttribute="trailing" constant="8" symbolic="YES" id="fu0-ZZ-rj9"/>
                            <constraint firstAttribute="trailing" secondItem="lTK-Hd-Tl2" secondAttribute="trailing" constant="16" id="gdg-7Y-7la"/>
                            <constraint firstAttribute="trailing" secondItem="1IX-z5-wWx" secondAttribute="trailing" constant="16" id="hHM-jO-RZd"/>
+                            <constraint firstItem="pVf-cJ-9ca" firstAttribute="centerX" secondItem="joK-xi-MCo" secondAttribute="centerX" id="lOM-Fa-KdR"/>
                            <constraint firstItem="6d9-Bc-hIz" firstAttribute="top" secondItem="joK-xi-MCo" secondAttribute="bottom" constant="32" id="m9s-An-IWV"/>
                            <constraint firstItem="vfk-OJ-S3T" firstAttribute="top" secondItem="yUQ-mI-ozK" secondAttribute="bottom" constant="8" id="oaW-rr-UVN"/>
                            <constraint firstItem="nsl-df-P21" firstAttribute="trailing" secondItem="vfk-OJ-S3T" secondAttribute="trailing" id="r5e-Wq-dqV"/>
                            <constraint firstItem="y5i-MZ-Qat" firstAttribute="centerX" secondItem="nsl-df-P21" secondAttribute="centerX" id="reC-GA-ZgT"/>
                            <constraint firstAttribute="trailing" secondItem="0QE-3F-a4G" secondAttribute="trailing" constant="62.5" id="tg1-gr-hdd"/>
-                            <constraint firstAttribute="trailing" secondItem="6d9-Bc-hIz" secondAttribute="trailing" constant="82" id="vtN-y4-iqp"/>
+                            <constraint firstAttribute="trailing" secondItem="6d9-Bc-hIz" secondAttribute="trailing" constant="44" id="vtN-y4-iqp"/>
                            <constraint firstItem="0QE-3F-a4G" firstAttribute="centerY" secondItem="jUc-tP-CC5" secondAttribute="centerY" id="xDi-tj-bBF"/>
                            <constraint firstItem="lTK-Hd-Tl2" firstAttribute="top" secondItem="jUc-tP-CC5" secondAttribute="bottom" constant="40" id="ytQ-s4-kJm"/>
                            <constraint firstItem="w2a-RA-zmI" firstAttribute="centerY" secondItem="lTK-Hd-Tl2" secondAttribute="centerY" constant="-1" id="zHt-h3-4ig"/>
@@ -185,6 +220,8 @@
                        <outlet property="scrubberSlider" destination="w2a-RA-zmI" id="VbI-tT-lbc"/>
                        <outlet property="skipBackwardButton" destination="tFH-sY-Xu9" id="LwM-2S-m6F"/>
                        <outlet property="skipForwardButton" destination="0QE-3F-a4G" id="cQ7-b7-pW7"/>
+                        <outlet property="skipSilencesSwitch" destination="2cn-E5-TeQ" id="TRI-IT-YJT"/>
+                        <outlet property="sleepSwitch" destination="IGe-aU-Y6D" id="BZn-9C-hOk"/>
                        <outlet property="streamButton" destination="6d9-Bc-hIz" id="DZe-ga-3RV"/>
                    </connections>
                </viewController>
@@ -0,0 +1,82 @@
+//
+//  Model.swift
+//  SwiftAudioPlayer_Example
+//
+//  Created by Tanha Kabir on 3/17/21.
+//  Copyright © 2021 CocoaPods. All rights reserved.
+//
+
+import Foundation
+
+struct AudioInfo: Hashable {
+    var index: Int = 0
+    
+    var urls: [URL] = [URL(string: "https://www.fesliyanstudios.com/musicfiles/2019-04-23_-_Trusted_Advertising_-_www.fesliyanstudios.com/15SecVersion2019-04-23_-_Trusted_Advertising_-_www.fesliyanstudios.com.mp3")!,
+                       URL(string: "https://chtbl.com/track/18338/traffic.libsyn.com/secure/acquired/acquired_-_armrev_2.mp3?dest-id=376122")!,
+                       URL(string: "https://backtracks.fm/ycombinator/pr/0f685f72-29b1-11e9-9bcf-0ece7a7d2472/111---jake-klamka-and-kevin-hale---y-combinator.mp3?s=1&amp;sd=1&amp;u=1549423185")!]
+    
+    var url: URL {
+        switch index {
+        case 0:
+            return URL(string: "https://www.fesliyanstudios.com/musicfiles/2019-04-23_-_Trusted_Advertising_-_www.fesliyanstudios.com/15SecVersion2019-04-23_-_Trusted_Advertising_-_www.fesliyanstudios.com.mp3")!
+        case 1:
+            return URL(string: "https://chtbl.com/track/18338/traffic.libsyn.com/secure/acquired/acquired_-_armrev_2.mp3?dest-id=376122")!
+        case 2:
+            return URL(string: "https://backtracks.fm/ycombinator/pr/0f685f72-29b1-11e9-9bcf-0ece7a7d2472/111---jake-klamka-and-kevin-hale---y-combinator.mp3?s=1&amp;sd=1&amp;u=1549423185")!
+        default:
+            return URL(string: "https://www.fesliyanstudios.com/musicfiles/2019-04-23_-_Trusted_Advertising_-_www.fesliyanstudios.com/15SecVersion2019-04-23_-_Trusted_Advertising_-_www.fesliyanstudios.com.mp3")!
+        }
+    }
+    
+    var title: String {
+        switch index {
+        case 0:
+            return "Soundbite"
+        case 1:
+            return "Acquired"
+        case 2:
+            return "Y Combinator"
+        default:
+            return "Soundbite"
+        }
+    }
+    
+    let artist: String = "SwiftAudioPlayer Sample App"
+    let releaseDate: Int = 1550790640
+    
+    var savedUrl: URL? {
+        get {
+            return savedUrls[index]
+        }
+    }
+    
+    var savedUrls: [URL?] = [nil, nil, nil]
+    
+    mutating func addSavedUrl(_ url: URL) {
+        savedUrls[index] = url
+    }
+    
+    mutating func deleteSavedUrl() {
+        savedUrls[index] = nil
+    }
+    
+    mutating func addSavedUrl(_ url: URL, atIndex i: Int) {
+        savedUrls[i] = url
+    }
+    
+    mutating func deleteSavedUrl(atIndex i: Int) {
+        savedUrls[i] = nil
+    }
+    
+    func getUrl(atIndex i: Int) -> URL {
+        return urls[i]
+    }
+    
+    mutating func setIndex(_ i: Int) {
+        index = i
+    }
+    
+    func getIndex(forURL url: URL) -> Int? {
+        return urls.firstIndex(of: url) ?? savedUrls.firstIndex(of: url)
+    }
+}
@@ -11,55 +11,9 @@ import SwiftAudioPlayer
 import AVFoundation

 class ViewController: UIViewController {
-    struct AudioInfo: Hashable {
-        let index: Int
-        
-        var url: URL {
-            switch index {
-            case 0:
-                return URL(string: "https://cdn.fastlearner.media/bensound-rumble.mp3")!
-            case 1:
-                return URL(string: "https://chtbl.com/track/18338/traffic.libsyn.com/secure/acquired/acquired_-_armrev_2.mp3?dest-id=376122")!
-            case 2:
-                return URL(string: "https://backtracks.fm/ycombinator/pr/0f685f72-29b1-11e9-9bcf-0ece7a7d2472/111---jake-klamka-and-kevin-hale---y-combinator.mp3?s=1&amp;sd=1&amp;u=1549423185")!
-            default:
-                return URL(string: "https://cdn.fastlearner.media/bensound-rumble.mp3")!
-            }
-        }
-        
-        var title: String {
-            switch index {
-            case 0:
-                return "Soundbite"
-            case 1:
-                return "Acquired"
-            case 2:
-                return "Y Combinator"
-            default:
-                return "Soundbite"
-            }
-        }
-        
-        let artist: String = "SwiftAudioPlayer Sample App"
-        let releaseDate: Int = 1550790640
-    }
-    
-    var savedUrls: [AudioInfo: URL] = [:]
-    
-    var selectedAudio: AudioInfo = AudioInfo(index: 0) {
-        didSet {
-            if SAPlayer.Downloader.isDownloaded(withRemoteUrl: selectedAudio.url) {
-                downloadButton.setTitle("Delete downloaded", for: .normal)
-                streamButton.isEnabled = false
-            } else {
-                downloadButton.setTitle("Download", for: .normal)
-                streamButton.isEnabled = true
-            }
-            
-            self.currentUrlLocationLabel.text = "remote url: \(selectedAudio.url.absoluteString)"
-        }
-    }
+    var selectedAudio: AudioInfo = AudioInfo(index: 0)
    
+    var freq:[Int] = [0,0,0,0,0,0,0,0,0,0]
    @IBOutlet weak var currentUrlLocationLabel: UILabel!
    @IBOutlet weak var bufferProgress: UIProgressView!
    @IBOutlet weak var scrubberSlider: UISlider!
@@ -84,7 +38,18 @@ class ViewController: UIViewController {
    var isStreaming: Bool = false
    var beingSeeked: Bool = false
    
+    
+    var downloadId: UInt?
+    var durationId: UInt?
+    var bufferId: UInt?
+    var playingStatusId: UInt?
+    var queueId: UInt?
+    var elapsedId: UInt?
+
    var duration: Double = 0.0
+    var playbackStatus: SAPlayingStatus = .paused
+    
+    var lastPlayedAudioIndex: Int?
    
    var isPlayable: Bool = false {
        didSet {
@@ -103,22 +68,92 @@ class ViewController: UIViewController {
    override func viewDidLoad() {
        super.viewDidLoad()
        
+        SAPlayer.Downloader.allowUsingCellularData = true
+        
+//        SAPlayer.shared.DEBUG_MODE = true
+        
        isPlayable = false
-        selectedAudio = AudioInfo(index: 0)
+        checkIfAudioDownloaded()
+        selectAudio(atIndex: 0)
        
-        addRandomModifiers()
+//        addRandomModifiers()
        
-        _ = SAPlayer.Updates.Duration.subscribe { [weak self] (url, duration) in
+        subscribeToChanges()
+    }
+    
+    func addRandomModifiers() {
+        let node = AVAudioUnitReverb()
+        SAPlayer.shared.audioModifiers.append(node)
+        node.wetDryMix = 300
+        let frequency:[Int] = [60,170,310,600,1000,3000,6000,12000,14000,16000]
+        let node2 = AVAudioUnitEQ(numberOfBands:frequency.count)
+        node2.globalGain = 1
+        for i in 0...(node2.bands.count-1) {
+            node2.bands[i].frequency  = Float(frequency[i])
+            node2.bands[i].gain       = 0
+            node2.bands[i].bypass     = false
+            node2.bands[i].filterType = .parametric
+        }
+        SAPlayer.shared.audioModifiers.append(node2)
+    }
+
+    override func didReceiveMemoryWarning() {
+        super.didReceiveMemoryWarning()
+        // Dispose of any resources that can be recreated.
+    }
+    
+    @IBAction func audioSelected(_ sender: Any) {
+        let selected = audioSelector.selectedSegmentIndex
+        
+        selectAudio(atIndex: selected)
+    }
+    
+    func selectAudio(atIndex i: Int) {
+        selectedAudio.setIndex(i)
+        
+        if selectedAudio.savedUrl != nil {
+            downloadButton.setTitle("Delete downloaded", for: .normal)
+            streamButton.isEnabled = false
+        } else {
+            downloadButton.setTitle("Download", for: .normal)
+            streamButton.isEnabled = true
+        }
+        
+        if let savedUrl = selectedAudio.savedUrl {
+            self.currentUrlLocationLabel.text = "saved url: \(savedUrl.absoluteString)"
+        } else {
+            self.currentUrlLocationLabel.text = "remote url: \(selectedAudio.url.absoluteString)"
+        }
+        
+        //        if let savedUrl = savedUrls[selectedAudio] {}
+        scrubberSlider.value = 0
+        bufferProgress.progress = 0
+        
+//        unsubscribeFromChanges()
+//        subscribeToChanges()
+        
+        SAPlayer.shared.mediaInfo = SALockScreenInfo(title: selectedAudio.title, artist: selectedAudio.artist, artwork: UIImage(), releaseDate: selectedAudio.releaseDate)
+    }
+    
+    func checkIfAudioDownloaded() {
+        for i in 0...2 {
+            if let savedUrl = SAPlayer.Downloader.getSavedUrl(forRemoteUrl: selectedAudio.getUrl(atIndex: i)) {
+                selectedAudio.addSavedUrl(savedUrl, atIndex: i)
+            }
+        }
+    }
+    
+    func subscribeToChanges() {
+        durationId = SAPlayer.Updates.Duration.subscribe { [weak self] (url, duration) in
            guard let self = self else { return }
-            guard url == self.selectedAudio.url || url == self.savedUrls[self.selectedAudio] else { return }
+            guard url == self.selectedAudio.savedUrl || url == self.selectedAudio.url else { return }
            self.durationLabel.text = SAPlayer.prettifyTimestamp(duration)
            self.duration = duration
        }
        
-        _ = SAPlayer.Updates.ElapsedTime.subscribe { [weak self] (url, position) in
+        elapsedId = SAPlayer.Updates.ElapsedTime.subscribe { [weak self] (url, position) in
            guard let self = self else { return }
-            guard self.beingSeeked == false else { return }
-            guard url == self.selectedAudio.url || url == self.savedUrls[self.selectedAudio] else { return }
+            guard url == self.selectedAudio.savedUrl || url == self.selectedAudio.url else { return }
            
            self.currentTimestampLabel.text = SAPlayer.prettifyTimestamp(position)
            
@@ -127,7 +162,7 @@ class ViewController: UIViewController {
            self.scrubberSlider.value = Float(position/self.duration)
        }
        
-        _ = SAPlayer.Updates.AudioDownloading.subscribe { [weak self] (url, progress) in
+        downloadId = SAPlayer.Updates.AudioDownloading.subscribe { [weak self] (url, progress) in
            guard let self = self else { return }
            guard url == self.selectedAudio.url else { return }
            
@@ -140,26 +175,28 @@ class ViewController: UIViewController {
            }
        }
        
-        _ = SAPlayer.Updates.StreamingBuffer.subscribe{ [weak self] (url, buffer) in
+        bufferId = SAPlayer.Updates.StreamingBuffer.subscribe{ [weak self] (url, buffer) in
            guard let self = self else { return }
-            guard url == self.selectedAudio.url || url == self.savedUrls[self.selectedAudio] else { return }
+            guard url == self.selectedAudio.savedUrl || url == self.selectedAudio.url else { return }
            
            if self.duration == 0.0 { return }
            
-            let progress = Float((buffer.totalDurationBuffered + buffer.startingBufferTimePositon) / self.duration)
+            self.bufferProgress.progress = Float(buffer.bufferingProgress)
            
-            self.bufferProgress.progress = progress
-            
-            if progress >= 0.99 {
+            if buffer.bufferingProgress >= 0.99 {
                self.streamButton.isEnabled = false
+            } else {
+                self.streamButton.isEnabled = true
            }
            
            self.isPlayable = buffer.isReadyForPlaying
        }
        
-        _ = SAPlayer.Updates.PlayingStatus.subscribe { [weak self] (url, playing) in
+        playingStatusId = SAPlayer.Updates.PlayingStatus.subscribe { [weak self] (url, playing) in
            guard let self = self else { return }
-            guard url == self.selectedAudio.url || url == self.savedUrls[self.selectedAudio] else { return }
+            guard url == self.selectedAudio.savedUrl || url == self.selectedAudio.url else { return }
+            
+            self.playbackStatus = playing
            
            switch playing {
            case .playing:
@@ -174,30 +211,40 @@ class ViewController: UIViewController {
                self.isPlayable = false
                self.playPauseButton.setTitle("Loading", for: .normal)
                return
+            case .ended:
+                self.isPlayable = false
+                self.playPauseButton.setTitle("Done", for: .normal)
+                return
            }
        }
+        
+        queueId = SAPlayer.Updates.AudioQueue.subscribe { [weak self] key, forthcomingPlaybackUrl in
+            guard let self = self else { return }
+            /// we update the selected audio. this is a little contrived, but allows us to update outlets
+            if let indexFound = self.selectedAudio.getIndex(forURL: forthcomingPlaybackUrl) {
+                self.selectAudio(atIndex: indexFound)
+            }
+            print("💥 Received queue update 💥")
+        }
    }
    
-    func addRandomModifiers() {
-        let node = AVAudioUnitReverb()
-        SAPlayer.shared.audioModifiers.append(node)
-        node.wetDryMix = 300
-    }
-
-    override func didReceiveMemoryWarning() {
-        super.didReceiveMemoryWarning()
-        // Dispose of any resources that can be recreated.
+    func unsubscribeFromChanges() {
+        guard let durationId = self.durationId,
+              let elapsedId = self.elapsedId,
+              let downloadId = self.downloadId,
+              let queueId = self.queueId,
+              let bufferId = self.bufferId,
+              let playingStatusId = self.playingStatusId else { return }
+        
+        SAPlayer.Updates.Duration.unsubscribe(durationId)
+        SAPlayer.Updates.ElapsedTime.unsubscribe(elapsedId)
+        SAPlayer.Updates.AudioDownloading.unsubscribe(downloadId)
+        SAPlayer.Updates.AudioQueue.unsubscribe(queueId)
+        SAPlayer.Updates.StreamingBuffer.unsubscribe(bufferId)
+        SAPlayer.Updates.PlayingStatus.unsubscribe(playingStatusId)
    }
    
-    @IBAction func audioSelected(_ sender: Any) {
-        let selected = audioSelector.selectedSegmentIndex
-        
-        selectedAudio = AudioInfo(index: selected)
-        
-        SAPlayer.shared.mediaInfo = SALockScreenInfo(title: selectedAudio.title, artist: selectedAudio.artist, artwork: UIImage(), releaseDate: selectedAudio.releaseDate)
-        
-        //        if let savedUrl = savedUrls[selectedAudio] {}
-    }
+    
    @IBAction func scrubberStartedSeeking(_ sender: UISlider) {
        beingSeeked = true
    }
@@ -212,10 +259,7 @@ class ViewController: UIViewController {
    @IBAction func rateChanged(_ sender: Any) {
        let speed = rateSlider.value
        rateLabel.text = "rate: \(speed)x"
-        if let node = SAPlayer.shared.audioModifiers[0] as? AVAudioUnitTimePitch {
-            node.rate = speed
-            SAPlayer.shared.playbackRateOfAudioChanged(rate: speed)
-        }
+        SAPlayer.shared.rate = speed
    }
    @IBAction func reverbChanged(_ sender: Any) {
        let reverb = reverbSlider.value
@@ -224,11 +268,21 @@ class ViewController: UIViewController {
            node.wetDryMix = reverb
        }
    }
+    @IBAction func queueTouched(_ sender: Any) {
+        if let savedUrl = selectedAudio.savedUrl {
+            SAPlayer.shared.queueSavedAudio(withSavedUrl: savedUrl)
+        } else {
+            SAPlayer.shared.queueRemoteAudio(withRemoteUrl: selectedAudio.url)
+        }
+        
+        print("queue: \(SAPlayer.shared.audioQueued)")
+    }
    
    @IBAction func downloadTouched(_ sender: Any) {
        if !isDownloading {
            if let savedUrl = SAPlayer.Downloader.getSavedUrl(forRemoteUrl: selectedAudio.url) {
                SAPlayer.Downloader.deleteDownloaded(withSavedUrl: savedUrl)
+                selectedAudio.deleteSavedUrl()
                downloadButton.setTitle("Download", for: .normal)
                streamButton.isEnabled = true
                isDownloading = false
@@ -239,9 +293,10 @@ class ViewController: UIViewController {
                    guard let self = self else { return }
                    DispatchQueue.main.async {
                        self.currentUrlLocationLabel.text = "saved to: \(url.lastPathComponent)"
-                        self.savedUrls[self.selectedAudio] = url
+                        self.selectedAudio.addSavedUrl(url)
                        
-                        SAPlayer.shared.initializeSavedAudio(withSavedUrl: url)
+                        SAPlayer.shared.startSavedAudio(withSavedUrl: url)
+                        self.lastPlayedAudioIndex = self.selectedAudio.index
                    }
                })
                streamButton.isEnabled = false
@@ -256,15 +311,30 @@ class ViewController: UIViewController {
    
    @IBAction func streamTouched(_ sender: Any) {
        if !isStreaming {
-            SAPlayer.shared.initializeRemoteAudio(withRemoteUrl: selectedAudio.url)
+            SAPlayer.shared.startRemoteAudio(withRemoteUrl: selectedAudio.url)
+            lastPlayedAudioIndex = selectedAudio.index
            streamButton.setTitle("Cancel streaming", for: .normal)
            downloadButton.isEnabled = false
+            isStreaming = true
        } else {
-            // TODO
+            SAPlayer.shared.stopStreamingRemoteAudio()
+            streamButton.setTitle("Stream", for: .normal)
+            downloadButton.isEnabled = true
+            isStreaming = false
        }
    }
    
    @IBAction func playPauseTouched(_ sender: Any) {
+//        if lastPlayedAudioIndex != selectedAudio.index {
+//            if let savedUrl = selectedAudio.savedUrl {
+//                SAPlayer.shared.startSavedAudio(withSavedUrl: savedUrl)
+//            } else {
+//                SAPlayer.shared.startRemoteAudio(withRemoteUrl: selectedAudio.url)
+//            }
+//
+//            return
+//        }
+        
        SAPlayer.shared.togglePlayAndPause()
    }
    
@@ -275,6 +345,37 @@ class ViewController: UIViewController {
    @IBAction func skipForwardTouched(_ sender: Any) {
        SAPlayer.shared.skipForward()
    }
+    @IBAction func setEqualizerValue(_ sender: Any) {
+        if let slider = sender as? UISlider{
+            print("slider of index:", slider.tag, "is changed to", slider.value)
+            freq[slider.tag] = Int(slider.value)
+            print("current frequency : ",freq)
+            if let node = SAPlayer.shared.audioModifiers[2] as? AVAudioUnitEQ{
+                for i in 0...(node.bands.count - 1){
+                    node.bands[i].gain = Float(freq[i])
+                }
+            }
+        }
+        
+    }
    
+    @IBOutlet weak var skipSilencesSwitch: UISwitch!
+    
+    @IBAction func skipSilencesSwitched(_ sender: Any) {
+        if skipSilencesSwitch.isOn {
+            _ = SAPlayer.Features.SkipSilences.enable()
+        } else {
+            _ = SAPlayer.Features.SkipSilences.disable()
+        }
+    }
+    @IBOutlet weak var sleepSwitch: UISwitch!
+    
+    @IBAction func sleepSwitched(_ sender: Any) {
+        if sleepSwitch.isOn {
+            _ = SAPlayer.Features.SleepTimer.enable(afterDelay: 5.0)
+        } else {
+            _ = SAPlayer.Features.SleepTimer.disable()
+        }
+    }
 }

@@ -4,21 +4,39 @@
 [![License](https://img.shields.io/cocoapods/l/SwiftAudioPlayer.svg?style=flat)](https://cocoapods.org/pods/SwiftAudioPlayer)
 [![Platform](https://img.shields.io/cocoapods/p/SwiftAudioPlayer.svg?style=flat)](https://cocoapods.org/pods/SwiftAudioPlayer)

-Swift based audio player that is able to both stream remote audio and play locally saved audio, while performing audio manipulations in real-time. Underlying using AVAudioEngine, and you can change the rate of audio (up to 32x), change pitch, and [other audio enhancements](https://developer.apple.com/documentation/avfoundation/audio_track_engineering/audio_engine_building_blocks/audio_enhancements).
+Swift-based audio player with AVAudioEngine as its base. Allows for: streaming online audio, playing local file, changing audio speed (3.5X, 4X, 32X), pitch, and real-time audio manipulation using custom [audio enhancements](https://developer.apple.com/documentation/avfoundation/audio_track_engineering/audio_engine_building_blocks/audio_enhancements).

-This player was originally developed to be used in a [podcast player](https://chameleonpodcast.com/). We had originally used AVPlayer for playing audio but we wanted to manipulate audio that was being streamed. We set up AVAudioEngine at first just to play a file saved on the phone and it worked great, but AVAudioEngine on its own doesn't support streaming audio as easily as AVPlayer.
+This player was built for [podcasting](https://chameleonpodcast.com/). We originally used AVPlayer for playing audio but we wanted to manipulate audio that was being streamed. We set up AVAudioEngine at first just to play a file saved on the phone and it worked great, but AVAudioEngine on its own doesn't support streaming audio as easily as AVPlayer.

 Thus, using [AudioToolbox](https://developer.apple.com/documentation/audiotoolbox), we are able to stream audio and convert the downloaded data into usable data for the AVAudioEngine to play. For an overview of our solution check out our [blog post](https://medium.com/chameleon-podcast/creating-an-advanced-streaming-audio-engine-for-ios-9fbc7aef4115).

+### Basic Features
+
+1. Realtime audio manipulation that includes going up to 10x speed, using [equalizers and other manipulations](https://developer.apple.com/documentation/avfaudio/avaudiouniteq)
+1. Stream online audio using AVAudioEngine
+1. Play locally saved audio with the same API
+1. Download audio
+1. Queue up downloaded and streamed audio for autoplay
+1. Uses only 1-2% CPU for optimal performance for the rest of your app
+1. You're able to install taps and any other AVAudioEngine features to do cool things like skipping silences
+
+### Special Features
+These are community supported audio manipulation features using this audio engine. You can implement your own version of these features and you can look at [SAPlayerFeatures](https://github.com/tanhakabir/SwiftAudioPlayer/blob/master/Source/SAPlayerFeatures.swift) to learn how they were implemented using the library.
+1. Skip silences in audio
+1. Sleep timer to stop playing audio after a delay
+
 ### Requirements

-SwiftAudioPlayer is only available for iOS 10.0 and higher.
+iOS 10.0 and higher.

 ## Getting Started

-### Example Project
+### Running the Example Project

-To run the example project, clone the repo, and run `pod install` from the Example directory first.
+1. Clone repo
+2. CD to the `Example` folder where the Example app lives
+3. Run `pod install` in terminal
+4. Build and run

 ### Installation

@@ -31,12 +49,17 @@ pod 'SwiftAudioPlayer'

 ### Usage

+Import the player at the top:
+```swift
+import SwiftAudioPlayer
+```
+
 **Important:** For app in background downloading please refer to [note](#important-step-for-background-downloads).

 To play remote audio:
 ```swift
 let url = URL(string: "https://randomwebsite.com/audio.mp3")!
-SAPlayer.shared.initializeAudio(withRemoteUrl: url)
+SAPlayer.shared.startRemoteAudio(withRemoteUrl: url)
 SAPlayer.shared.play()
 ```

@@ -46,7 +69,7 @@ let info = SALockScreenInfo(title: "Random audio", artist: "Foo", artwork: UIIma
 SAPlayer.shared.mediaInfo = info
 ```

-To receive streaming progress:
+To receive streaming progress (for buffer progress %):
 ```swift
@IBOutlet weak var bufferProgress: UIProgressView!

@@ -115,21 +138,21 @@ SwiftAudioPlayer is available under the MIT license. See the LICENSE file for mo

 Access the player and all of its fields and functions through `SAPlayer.shared`.

-### Playing Audio
+### Supported file types
+
+Known supported file types are `.mp3` and `.wav`.
+
+### Playing Audio (Basic Commands)

 To set up player with audio to play, use either: 
-* `initializeSavedAudio(withSavedUrl url: URL, mediaInfo: SALockScreenInfo?)` to play audio that is saved on the device.
-* `initializeRemoteAudio(withRemoteUrl url: URL, mediaInfo: SALockScreenInfo?)` to play audio streamed from a remote location.
+* `startSavedAudio(withSavedUrl url: URL, mediaInfo: SALockScreenInfo?)` to play audio that is saved on the device.
+* `startRemoteAudio(withRemoteUrl url: URL, mediaInfo: SALockScreenInfo?)` to play audio streamed from a remote location.

 Both of these expect a URL of the location of the audio and an optional media information to display on the lockscreen. 

 For streaming remote audio, subscribe to `SAPlayer.Updates.StreamingBuffer` for updates on streaming progress.

-#### Important
-
-Any audio manipulation intended to on the audio must have the nodes anticipated to use finalized before initialize is called. Look at [audio manipulation documentation](#realtime-audio-manipulation) for more information.
-
-All other basic controls are available:
+Basic controls available:
 ```swift
 play()
 pause()
@@ -139,32 +162,23 @@ skipForward()
 skipBackwards()
 ```

-### Realtime Audio Manipulation
+### Queuing Audio for Autoplay

-All audio effects on the player is done through [AVAudioUnit](https://developer.apple.com/documentation/avfoundation/avaudiounit) nodes. These include adding reverb, changing pitch and playback rate, and adding distortion. Full list of effects available [here](https://developer.apple.com/documentation/avfoundation/audio_track_engineering/audio_engine_building_blocks/audio_enhancements).
-
-The effects intended to use are stored in `audioModifiers` as a list of nodes. These nodes are in the order that the engine will attach them to one another.
-
-**Note:** By default `SAPlayer` starts off with one node, an [AVAudioUnitTimePitch](https://developer.apple.com/documentation/avfoundation/avaudiounittimepitch) node, that is set to change the rate of audio without changing the pitch of the audio (intended for changing the rate of spoken word).
-
-#### Important
-All the nodes intended to be used on the playing audio must be finalized before calling `initializeSavedAudio(...)` or `initializeRemoteAudio(...)`. Any changes to list of nodes after initialize is called for a given audio file will not be reflected in playback.
-
-Once all nodes are added to `audioModifiers` and the player has been initialized, any manipulations done with the nodes are performed in realtime. The example app shows manipulating the playback rate in realtime:
+You can queue either remote or locally saved audio to be played automatically next. 

+To queue:
 ```swift
-let speed = rateSlider.value
-if let node = SAPlayer.shared.audioModifiers[0] as? AVAudioUnitTimePitch {
-    node.rate = speed
-    SAPlayer.shared.playbackRateOfAudioChanged(rate: speed)
-}
+SAPlayer.shared.queueSavedAudio(withSavedUrl: C://random_folder/audio.mp3) // or
+SAPlayer.shared.queueRemoteAudio(withRemoteUrl: https://randomwebsite.com/audio.mp3)
 ```

-**Note:** if the rate of the audio is changed, `playbackRateOfAudioChanged` should also be called to update the lockscreen's media player.
+#### Important
+
+The engine can handle audio manipulations like speed, pitch, effects, etc. To do this, nodes for effects must be finalized before initialize is called. Look at [audio manipulation documentation](#realtime-audio-manipulation) for more information.

 ### Lockscreen Media Player
 
-Update and set what displays on the lockscreen's media player when the player is active.
+Update and set what displays on the lockscreen's media player when the player is active. 

 `skipForwardSeconds` and `skipBackwardSeconds` for the intervals to skip forward and back with.

@@ -196,7 +210,7 @@ func application(_ application: UIApplication, handleEventsForBackgroundURLSessi

 ### Downloading

-Downloads will be held on pause when active stream is started, and will resume downloads when streaming is done.
+All downloads will be paused when audio is streamed from a URL. They will automatically resume when streaming is done.

 Use the following to start downloading audio in the background:

@@ -214,6 +228,12 @@ And use the following to stop any active or prevent future downloads of the corr
 func cancelDownload(withRemoteUrl url: URL)
 ```

+By default downloading will be allowed on cellular data. If you would like to turn this off set:
+```swift
+SAPlayer.Downloader.allowUsingCellularData = false
+```
+You can also retrieve what preference you have set for cellular downloads through `allowUsingCellularData`.
+
 ### Manage Downloaded

 Use the following to manage downloaded audio files.
@@ -233,6 +253,8 @@ Delete downloaded audio if it exists:
 func deleteDownloaded(withSavedUrl url: URL)
 ```

+**NOTE:** You're in charge or clearing downloads when your don't need them anymore
+
 ## SAPlayer.Updates

 Receive updates for changing values from the player, such as the duration, elapsed time of playing audio, download progress, and etc.
@@ -265,12 +287,12 @@ Subscribe to this to update views on changes in position of which part of audio
 ### Duration
 Payload = `Double`

-Changes in the duration of the current initialized audio. Especially helpful for audio that is being streamed and can change with more data.
+Changes in the duration of the current initialized audio. Especially helpful for audio that is being streamed and can change with more data. The engine makes a best effort guess as to the duration of the audio. The guess gets better with more bytes streamed from the web.

 ### PlayingStatus
 Payload = `SAPlayingStatus`

-Changes in the playing status of the player. Can be one of the following 3: `playing`, `paused`, `buffering`.
+Changes in the playing status of the player. Can be one of the following 4: `playing`, `paused`, `buffering`, `ended` (audio ended).

 ### StreamingBuffer
 Payload = `SAAudioAvailabilityRange`
@@ -283,3 +305,29 @@ For progress of downloading audio that saves to the phone for playback later, lo
 Payload = `Double`

 Changes in the progress of downloading audio in the background. This does not correspond to progress in streaming downloads, look at StreamingBuffer for streaming progress.
+
+## Audio Effects
+
+### Realtime Audio Manipulation
+
+All audio effects on the player is done through [AVAudioUnit](https://developer.apple.com/documentation/avfoundation/avaudiounit) nodes. These include adding reverb, changing pitch and playback rate, and adding distortion. Full list of effects available [here](https://developer.apple.com/documentation/avfoundation/audio_track_engineering/audio_engine_building_blocks/audio_enhancements).
+
+The effects intended to use are stored in `audioModifiers` as a list of nodes. These nodes are in the order that the engine will attach them to one another.
+
+**Note:** By default `SAPlayer` starts off with one node, an [AVAudioUnitTimePitch](https://developer.apple.com/documentation/avfoundation/avaudiounittimepitch) node, that is set to change the rate of audio without changing the pitch of the audio (intended for changing the rate of spoken word).
+
+#### Important
+All the nodes intended to be used on the playing audio must be finalized before calling `initializeSavedAudio(...)` or `initializeRemoteAudio(...)`. Any changes to list of nodes after initialize is called for a given audio file will not be reflected in playback.
+
+Once all nodes are added to `audioModifiers` and the player has been initialized, any manipulations done with the nodes are performed in realtime. The example app shows manipulating the playback rate in realtime:
+
+```swift
+let speed = rateSlider.value
+if let node = SAPlayer.shared.audioModifiers[0] as? AVAudioUnitTimePitch {
+    node.rate = speed
+    SAPlayer.shared.playbackRateOfAudioChanged(rate: speed)
+}
+```
+
+**Note:** if the rate of the audio is changed, `playbackRateOfAudioChanged` should also be called to update the lockscreen's media player.
+
@@ -0,0 +1,32 @@
+//
+//  AudioQueueDirector.swift
+//  SwiftAudioPlayer
+//
+//  Created by Joe Williams on 3/10/21.
+//
+
+import Foundation
+
+class AudioQueueDirector {
+    static let shared = AudioQueueDirector()
+    var closures: DirectorThreadSafeClosures<URL> = DirectorThreadSafeClosures()
+    private init() {}
+
+    func create() {}
+
+    func clear() {
+        closures.clear()
+    }
+
+    func attach(closure: @escaping (Key, URL) throws -> Void) -> UInt {
+        return closures.attach(closure: closure)
+    }
+
+    func detach(withID id: UInt) {
+        closures.detach(id: id)
+    }
+    
+    func changeInQueue(_ key: Key, url: URL) {
+        closures.broadcast(key: key, payload: url)
+    }
+}
@@ -64,17 +64,17 @@ class AudioDiskEngine: AudioEngine {
            audioSampleRate = Float(audioFormat?.sampleRate ?? 44100)
            audioLengthSeconds = Float(audioLengthSamples) / audioSampleRate
            duration = Duration(audioLengthSeconds)
-            bufferedSeconds = SAAudioAvailabilityRange(startingNeedle: 0, durationLoadedByNetwork: duration, isPlayable: true)
+            bufferedSeconds = SAAudioAvailabilityRange(startingNeedle: 0, durationLoadedByNetwork: duration, predictedDurationToLoad: duration, isPlayable: true)
        } else {
            Log.monitor("Could not load downloaded file with url: \(url)")
        }
        
-        
-        Timer.scheduledTimer(withTimeInterval: 0.2, repeats: true) { [weak self] (timer: Timer) in
-            guard let _ = self else { return }
-            self?.timer = timer
-            self?.updateIsPlaying()
-            self?.updateNeedle()
+        doRepeatedly(timeInterval: 0.2) { [weak self] in
+            guard let self = self else { return }
+            guard self.playingStatus != .ended else { return }
+            
+            self.updateIsPlaying()
+            self.updateNeedle()
        }
        
        scheduleAudioFile()
@@ -98,7 +98,7 @@ class AudioDiskEngine: AudioEngine {
            if state == .resumed {
                state = .suspended
            }
-            delegate?.didEndPlaying()
+            playingStatus = .ended
        }
        
        guard audioSampleRate != 0 else {
@@ -136,6 +136,7 @@ class AudioDiskEngine: AudioEngine {
    }
    
    override func invalidate() {
+        super.invalidate()
        //Nothing to invalidate for disk
    }
 }
@@ -27,6 +27,8 @@ import Foundation
 import AVFoundation

 protocol AudioEngineProtocol {
+    var key: Key { get }
+    var engine: AVAudioEngine! { get }
    func play()
    func pause()
    func seek(toNeedle needle: Needle)
@@ -34,18 +36,15 @@ protocol AudioEngineProtocol {
 }

 protocol AudioEngineDelegate: AnyObject {
-    func didEndPlaying() //for auto play
    func didError()
 }

 class AudioEngine: AudioEngineProtocol {
    weak var delegate:AudioEngineDelegate?
-    let key:Key
+    var key:Key
    
-    let engine = AVAudioEngine()
-    let playerNode = AVAudioPlayerNode()
-    
-    var timer: Timer?
+    var engine: AVAudioEngine!
+    var playerNode: AVAudioPlayerNode!
    
    static let defaultEngineAudioFormat: AVAudioFormat = AVAudioFormat(commonFormat: .pcmFormatFloat32, sampleRate: 44100, channels: 2, interleaved: false)!
    
@@ -76,13 +75,13 @@ class AudioEngine: AudioEngineProtocol {
            guard playingStatus != oldValue, let status = playingStatus else {
                return
            }
-            
+ 
            AudioClockDirector.shared.audioPlayingStatusWasChanged(key, status: status)
        }
    }
    
-    var bufferedSecondsDebouncer: SAAudioAvailabilityRange = SAAudioAvailabilityRange(startingNeedle: 0.0, durationLoadedByNetwork: 0.0, isPlayable: false)
-    var bufferedSeconds: SAAudioAvailabilityRange =  SAAudioAvailabilityRange(startingNeedle: 0.0, durationLoadedByNetwork: 0.0, isPlayable: false) {
+    var bufferedSecondsDebouncer: SAAudioAvailabilityRange = SAAudioAvailabilityRange(startingNeedle: 0.0, durationLoadedByNetwork: 0.0, predictedDurationToLoad: Double.greatestFiniteMagnitude, isPlayable: false)
+    var bufferedSeconds: SAAudioAvailabilityRange =  SAAudioAvailabilityRange(startingNeedle: 0.0, durationLoadedByNetwork: 0.0, predictedDurationToLoad: Double.greatestFiniteMagnitude, isPlayable: false) {
        didSet {
            if bufferedSeconds.startingNeedle == 0.0 && bufferedSeconds.durationLoadedByNetwork == 0.0 {
                bufferedSecondsDebouncer = bufferedSeconds
@@ -108,6 +107,13 @@ class AudioEngine: AudioEngineProtocol {
        self.key = url.key
        self.delegate = delegate
        
+        engine = AVAudioEngine()
+        playerNode = AVAudioPlayerNode()
+        
+        initHelper(engineAudioFormat)
+    }
+    
+    func initHelper(_ engineAudioFormat: AVAudioFormat) {
        engine.attach(playerNode)
        
        for node in SAPlayer.shared.audioModifiers {
@@ -141,25 +147,59 @@ class AudioEngine: AudioEngineProtocol {
    }
    
    deinit {
-        timer?.invalidate()
        if state == .resumed {
            engine.stop()
        }
+        
+        engine.disconnectNodeInput(self.playerNode)
+        engine.detach(self.playerNode)
+        
+        engine = nil
+        playerNode = nil
+        Log.info("deinit AVAudioEngine for \(key)")
+    }
+    
+    func doRepeatedly(timeInterval: Double, _ closure: @escaping () -> ()) {
+        // A common error in AVAudioEngine is 'required condition is false: nil == owningEngine || GetEngine() == owningEngine'
+        // where there can only be one instance of engine running at a time and if there is already one when trying to start
+        // a new one then this error will be thrown.
+        
+        // To handle this error we need to make sure we properly dispose of the engine when done using. In the case of timers, a
+        // repeating timer will maintain a strong reference to the body even if you state that you wanted a weak reference to self
+        // to mitigate this for repeating timers, you can either call timer.invalidate() properly or don't use repeat block timers.
+        // To be in better control of references and to mitigate any unforeseen issues, I decided to implement a recurisive version
+        // of the repeat block timer so I'm in full control of when to invalidate.
+        
+        Timer.scheduledTimer(withTimeInterval: timeInterval, repeats: false) { [weak self] (timer: Timer) in
+            guard let self = self else { return }
+            guard self.playingStatus != .ended else {
+                self.delegate = nil
+                return
+            }
+            closure()
+            self.doRepeatedly(timeInterval: timeInterval, closure)
+        }
    }
    
    func updateIsPlaying() {
        if !bufferedSeconds.isPlayable {
-            playingStatus = .buffering
+            if bufferedSeconds.reachedEndOfAudio(needle: needle) {
+                playingStatus = .ended
+            } else {
+                playingStatus = .buffering
+            }
            return
        }
        
        let isPlaying = engine.isRunning && playerNode.isPlaying
        playingStatus = isPlaying ? .playing : .paused
+        
+//        playingStatus = .paused
    }
    
    func play() {
        // https://stackoverflow.com/questions/36754934/update-mpremotecommandcenter-play-pause-button
-        if !engine.isRunning {
+        if !(engine.isRunning) {
            do {
                try engine.start()
                
@@ -61,7 +61,7 @@ class AudioStreamEngine: AudioEngine {
    private let MIN_BUFFERS_TO_BE_PLAYABLE = 1
    private let PCM_BUFFER_SIZE: AVAudioFrameCount = 8192
    
-    private let queue = DispatchQueue(label: "SwiftAudioPlayer.engine", qos: .userInitiated)
+    private let queue = DispatchQueue(label: "SwiftAudioPlayer.StreamEngine", qos: .userInitiated)
    
    //From init
    private var converter: AudioConvertable!
@@ -137,7 +137,7 @@ class AudioStreamEngine: AudioEngine {
        Log.info(url)
        super.init(url: url, delegate: delegate, engineAudioFormat: AudioEngine.defaultEngineAudioFormat)
        do {
-            converter = try AudioConverter(withRemoteUrl: url, toEngineAudioFormat: AudioEngine.defaultEngineAudioFormat)
+            converter = try AudioConverter(withRemoteUrl: url, toEngineAudioFormat: AudioEngine.defaultEngineAudioFormat, withPCMBufferSize: PCM_BUFFER_SIZE)
        } catch {
            delegate?.didError()
        }
@@ -145,13 +145,15 @@ class AudioStreamEngine: AudioEngine {
        
        let timeInterval = 1 / (converter.engineAudioFormat.sampleRate / Double(PCM_BUFFER_SIZE))
        
-        Timer.scheduledTimer(withTimeInterval: timeInterval / 32, repeats: true) { [weak self] (timer: Timer) in
-            self?.timer = timer
-            self?.pollForNextBuffer()
-            self?.updateNetworkBufferRange()
-            self?.updateNeedle()
-            self?.updateIsPlaying()
-            self?.updateDuration()
+        doRepeatedly(timeInterval: timeInterval) { [weak self] in
+            guard let self = self else { return }
+            guard self.playingStatus != .ended else { return }
+            
+            self.pollForNextBufferRecursive()
+            self.updateNetworkBufferRange()
+            self.updateNeedle()
+            self.updateIsPlaying()
+            self.updateDuration()
        }
    }
    
@@ -160,19 +162,29 @@ class AudioStreamEngine: AudioEngine {
    //Called when
    //1. First time audio is finally parsed
    //2. When we run to the end of the network buffer and we're waiting again
-    private func pollForNextBuffer() {
+    private func pollForNextBufferRecursive() {
        guard shouldPollForNextBuffer else { return }
        
        do {
-            let nextScheduledBuffer = try converter.pullBuffer(withSize: PCM_BUFFER_SIZE)
+            var nextScheduledBuffer: AVAudioPCMBuffer! = try converter.pullBuffer()
            numberOfBuffersScheduledFromPoll += 1
            numberOfBuffersScheduledInTotal += 1
            
            Log.debug("processed buffer for engine of frame length \(nextScheduledBuffer.frameLength)")
            queue.async { [weak self] in
-                self?.playerNode.scheduleBuffer(nextScheduledBuffer) {
-                    self?.numberOfBuffersScheduledInTotal -= 1
-                    self?.pollForNextBufferRecursionHelper()
+                if #available(iOS 11.0, *) {
+                    // to make sure the pcm buffers are properly free'd from memory we need to nil them after the player has used them
+                    self?.playerNode.scheduleBuffer(nextScheduledBuffer, completionCallbackType: .dataRendered, completionHandler: { (_) in
+                        nextScheduledBuffer = nil
+                        self?.numberOfBuffersScheduledInTotal -= 1
+                        self?.pollForNextBufferRecursive()
+                    })
+                } else {
+                    self?.playerNode.scheduleBuffer(nextScheduledBuffer) {
+                        nextScheduledBuffer = nil
+                        self?.numberOfBuffersScheduledInTotal -= 1
+                        self?.pollForNextBufferRecursive()
+                    }
                }
            }
            
@@ -188,37 +200,11 @@ class AudioStreamEngine: AudioEngine {
        }
    }
    
-    private func pollForNextBufferRecursionHelper() {
-        do {
-            let nextScheduledBuffer = try converter.pullBuffer(withSize: PCM_BUFFER_SIZE)
-            Log.debug("processed buffer for engine of frame lengthL \(nextScheduledBuffer.frameLength)")
-            numberOfBuffersScheduledInTotal += 1
-            
-            queue.async { [weak self] in
-                self?.playerNode.scheduleBuffer(nextScheduledBuffer) {
-                    self?.numberOfBuffersScheduledInTotal -= 1
-                    self?.pollForNextBufferRecursionHelper()
-                }
-                
-            }
-            
-        } catch ConverterError.reachedEndOfFile {
-            Log.info(ConverterError.reachedEndOfFile.localizedDescription)
-        } catch ConverterError.notEnoughData {
-            shouldPollForNextBuffer = true
-            Log.debug(ConverterError.notEnoughData.localizedDescription)
-        } catch ConverterError.superConcerningShouldNeverHappen {
-            Log.error(ConverterError.superConcerningShouldNeverHappen.localizedDescription)
-        } catch {
-            Log.debug(error.localizedDescription)
-        }
-    }
-    
    private func updateNetworkBufferRange() { //for ui
        let range = converter.pollNetworkAudioAvailabilityRange()
        isPlayable = (numberOfBuffersScheduledInTotal >= MIN_BUFFERS_TO_BE_PLAYABLE && range.1 > 0) && predictedStreamDuration > 0
        Log.debug("loaded \(range), numberOfBuffersScheduledInTotal: \(numberOfBuffersScheduledInTotal), isPlayable: \(isPlayable)")
-        bufferedSeconds = SAAudioAvailabilityRange(startingNeedle: range.0, durationLoadedByNetwork: range.1, isPlayable: isPlayable)
+        bufferedSeconds = SAAudioAvailabilityRange(startingNeedle: range.0, durationLoadedByNetwork: range.1, predictedDurationToLoad: predictedStreamDuration, isPlayable: isPlayable)
    }
    
    private func updateNeedle() {
@@ -236,12 +222,6 @@ class AudioStreamEngine: AudioEngine {
        var currentTime = TimeInterval(playerTime.sampleTime) / playerTime.sampleRate
        currentTime = currentTime > 0 ? currentTime : 0
        
-        if currentTime > predictedStreamDuration {
-            Log.info("reached end of audio")
-            seek(toNeedle: 0)
-            pause()
-            delegate?.didEndPlaying()
-        }
        needle = (currentTime + currentTimeOffset)
    }
    
@@ -296,7 +276,18 @@ class AudioStreamEngine: AudioEngine {
        updateNetworkBufferRange()
    }
    
+    override func pause() {
+        queue.async { [weak self] in
+            self?.pauseHelperDispatchQueue()
+        }
+    }
+    
+    private func pauseHelperDispatchQueue() {
+        super.pause()
+    }
+    
    override func invalidate() {
+        super.invalidate()
        converter.invalidate()
    }
 }
@@ -97,7 +97,15 @@ class AudioThrottler: AudioThrottleable {
    private var networkData: [NetworkDataWrapper] = []
    var shouldThrottle = false
    var byteOffsetBecauseOfSeek: UInt = 0
-    var totalBytesExpected: Int64? //this got sent up twice. Once at beginning of stream and second from network seek. We honor the first send
+    
+    //This will be sent once at beginning of stream and every network seek
+    var totalBytesExpected: Int64? {
+        didSet {
+            if let bytes = totalBytesExpected {
+                delegate?.didUpdate(totalBytesExpected: Int64(byteOffsetBecauseOfSeek) + bytes)
+            }
+        }
+    }
    
    var largestPollingOffsetDifference: UInt64 = 1
    
@@ -110,9 +118,8 @@ class AudioThrottler: AudioThrottleable {
            Log.debug("received stream data of size \(pto.getData().count) and progress: \(pto.getProgress())")
            self.delegate?.didUpdate(networkStreamProgress: pto.getProgress())
            
-            if self.totalBytesExpected == nil, let totalBytesExpected = pto.getTotalBytesExpected() {
+            if let totalBytesExpected = pto.getTotalBytesExpected() {
                self.totalBytesExpected = totalBytesExpected
-                self.delegate?.didUpdate(totalBytesExpected: totalBytesExpected)
            }
            
            let lastItem = self.networkData.last
@@ -152,30 +159,34 @@ class AudioThrottler: AudioThrottleable {
                Log.debug("offset: \(offset) within network packet of range: \(wrappedNetworkData.startOffset) to \(wrappedNetworkData.endOffset) is next sent: \(wrappedNetworkData.isNextSent())")
                
                if wrappedNetworkData.alreadySent {
-                    if !wrappedNetworkData.isNextSent() {
-                        var bytesSent: UInt = 0
-                        var current = wrappedNetworkData
-                        
-                        // Sometimes the next data packet is smaller than a full audio chunk size, so we need to ensure we send up enough packets for the audio chunk. This prevented Issue #4 where tsreaming would randomly get stuck in a state needing more data up the chain.
-                        // https://github.com/tanhakabir/SwiftAudioPlayer/issues/4
-                        while bytesSent < largestPollingOffsetDifference {
-                            if let next = current.next {
-                                Log.debug("Sending next network packet with range: \(next.startOffset) to \(next.endOffset)")
+                    Log.debug("already sent offset: \(offset) within network packet of range: \(wrappedNetworkData.startOffset) to \(wrappedNetworkData.endOffset)")
+                    
+                    var bytesSent: UInt = 0
+                    var current = wrappedNetworkData
+                    
+                    // Sometimes the next data packet is smaller than a full audio chunk size, so we need to ensure we send up enough packets for the audio chunk. This prevented Issue #4 where tsreaming would randomly get stuck in a state needing more data up the chain.
+                    // https://github.com/tanhakabir/SwiftAudioPlayer/issues/4
+                    while bytesSent < largestPollingOffsetDifference {
+                        if let next = current.next {
+                            if !next.alreadySent {
+                                Log.info("Sending next network packet with range: \(next.startOffset) to \(next.endOffset), have sent \(bytesSent) bytes so far from \(largestPollingOffsetDifference) bytes")
                                next.alreadySent = true
                                delegate?.shouldProcess(networkData: next.data)
-                                bytesSent += next.byteCount
-                                current = next
-                            } else {
-                                return
                            }
+                            bytesSent += next.byteCount
+                            current = next
+                        } else {
+                            Log.debug("next package doesn't exist, bytes sent so far: \(bytesSent)")
+                            return
                        }
                    }
+                    
                    return
                }
                
-                Log.debug("Found network packet  to send with range: \(wrappedNetworkData.startOffset) to \(wrappedNetworkData.endOffset)")
-                delegate?.shouldProcess(networkData: wrappedNetworkData.data)
+                Log.info("Found network packet  to send with range: \(wrappedNetworkData.startOffset) to \(wrappedNetworkData.endOffset)")
                wrappedNetworkData.alreadySent = true
+                delegate?.shouldProcess(networkData: wrappedNetworkData.data)
                return
            }
        }
@@ -36,8 +36,8 @@ import AudioToolbox
 protocol AudioConvertable {
    var engineAudioFormat: AVAudioFormat {get}
    
-    init(withRemoteUrl url: AudioURL, toEngineAudioFormat: AVAudioFormat) throws
-    func pullBuffer(withSize size: AVAudioFrameCount) throws -> AVAudioPCMBuffer
+    init(withRemoteUrl url: AudioURL, toEngineAudioFormat: AVAudioFormat, withPCMBufferSize size: AVAudioFrameCount) throws
+    func pullBuffer() throws -> AVAudioPCMBuffer
    func pollPredictedDuration() -> Duration?
    func pollNetworkAudioAvailabilityRange() -> (Needle, Duration)
    func seek(_ needle: Needle)
@@ -70,13 +70,20 @@ class AudioConverter: AudioConvertable {
    
    //From protocol
    public var engineAudioFormat: AVAudioFormat
+    let pcmBufferSize: AVAudioFrameCount
    
    //Field
    var converter: AudioConverterRef? //set by AudioConverterNew
    var currentAudioPacketIndex: AVAudioPacketCount = 0
    
-    required init(withRemoteUrl url: AudioURL, toEngineAudioFormat: AVAudioFormat) throws {
+    // use to store reference to the allocated buffers from the converter to properly deallocate them before the next packet is being converted
+    var converterBuffer: UnsafeMutableRawPointer?
+    var converterDescriptions: UnsafeMutablePointer<AudioStreamPacketDescription>?
+    
+    required init(withRemoteUrl url: AudioURL, toEngineAudioFormat: AVAudioFormat, withPCMBufferSize size: AVAudioFrameCount) throws {
        self.engineAudioFormat = toEngineAudioFormat
+        self.pcmBufferSize = size
+        
        do {
            parser = try AudioParser(withRemoteUrl: url, parsedFileAudioFormatCallback: {
                [weak self] (fileAudioFormat: AVAudioFormat) in
@@ -108,17 +115,17 @@ class AudioConverter: AudioConvertable {
        }
    }
    
-    func pullBuffer(withSize size: AVAudioFrameCount) throws -> AVAudioPCMBuffer {
+    func pullBuffer() throws -> AVAudioPCMBuffer {
        guard let converter = converter else {
            Log.debug("reader_error trying to read before converter has been created")
            throw ConverterError.cannotCreatePCMBufferWithoutConverter
        }
        
-        guard let pcmBuffer = AVAudioPCMBuffer(pcmFormat: engineAudioFormat, frameCapacity: size) else {
+        guard let pcmBuffer = AVAudioPCMBuffer(pcmFormat: engineAudioFormat, frameCapacity: pcmBufferSize) else {
            Log.monitor(ConverterError.failedToCreatePCMBuffer.errorDescription as Any)
            throw ConverterError.failedToCreatePCMBuffer
        }
-        pcmBuffer.frameLength = size
+        pcmBuffer.frameLength = pcmBufferSize
        
        /**
         The whole thing is wrapped in queue.sync() because the converter listener
@@ -127,7 +134,7 @@ class AudioConverter: AudioConvertable {
         */
        return try queue.sync { () -> AVAudioPCMBuffer in
            let framesPerPacket = engineAudioFormat.streamDescription.pointee.mFramesPerPacket
-            var numberOfPacketsWeWantTheBufferToFill = size / framesPerPacket
+            var numberOfPacketsWeWantTheBufferToFill = pcmBuffer.frameLength / framesPerPacket
            
            let context = unsafeBitCast(self, to: UnsafeMutableRawPointer.self)
            let status = AudioConverterFillComplexBuffer(converter, ConverterListener, context, &numberOfPacketsWeWantTheBufferToFill, pcmBuffer.mutableAudioBufferList, nil)
@@ -57,28 +57,39 @@ public enum ConverterError: LocalizedError {
    public var errorDescription: String? {
        switch self {
        case .cannotLockQueue:
+            Log.warn("Failed to lock queue")
            return "Failed to lock queue"
        case .converterFailed(let status):
+            Log.warn(localizedDescriptionFromConverterError(status))
            return localizedDescriptionFromConverterError(status)
        case .failedToCreateDestinationFormat:
+            Log.warn("Failed to create a destination (processing) format")
            return "Failed to create a destination (processing) format"
        case .failedToCreatePCMBuffer:
+            Log.warn("Failed to create PCM buffer for reading data")
            return "Failed to create PCM buffer for reading data"
        case .notEnoughData:
+            Log.warn("Not enough data for read-conversion operation")
            return "Not enough data for read-conversion operation"
        case .parserMissingDataFormat:
+            Log.warn("Parser is missing a valid data format")
            return "Parser is missing a valid data format"
        case .reachedEndOfFile:
+            Log.warn("Reached the end of the file")
            return "Reached the end of the file"
        case .unableToCreateConverter(let status):
            return localizedDescriptionFromConverterError(status)
        case .superConcerningShouldNeverHappen:
+            Log.warn("Weird unexpected reader error. Should not have happened")
            return "Weird unexpected reader error. Should not have happened"
        case .cannotCreatePCMBufferWithoutConverter:
+            Log.debug("Could not create a PCM Buffer because reader does not have a converter yet")
            return "Could not create a PCM Buffer because reader does not have a converter yet"
        case .throttleParsingBuffersForEngine:
+            Log.warn("Preventing the reader from creating more PCM buffers since the player has more than 60 seconds of audio already to play")
            return "Preventing the reader from creating more PCM buffers since the player has more than 60 seconds of audio already to play"
        case .failedToCreateParser:
+            Log.warn("Could not create a parser")
            return "Could not create a parser"
        }
    }
@@ -65,16 +65,26 @@ func ConverterListener(_ converter: AudioConverterRef, _ packetCount: UnsafeMuta
        return ReaderShouldNotHappenError
    }
    
+    if let lastBuffer = selfAudioConverter.converterBuffer {
+        lastBuffer.deallocate()
+    }
+    
    // Copy data over (note we've only processing a single packet of data at a time)
    var packet = audioPacket.1
    let packetByteCount = packet.count //this is not the count of an array
    ioData.pointee.mNumberBuffers = 1
    ioData.pointee.mBuffers.mData = UnsafeMutableRawPointer.allocate(byteCount: packetByteCount, alignment: 0)
-    _ = packet.withUnsafeMutableBytes({ (bytes: UnsafeMutablePointer<UInt8>) in
+    _ = packet.accessMutableBytes({ (bytes: UnsafeMutablePointer<UInt8>) in
        memcpy((ioData.pointee.mBuffers.mData?.assumingMemoryBound(to: UInt8.self))!, bytes, packetByteCount)
    })
    ioData.pointee.mBuffers.mDataByteSize = UInt32(packetByteCount)
    
+    selfAudioConverter.converterBuffer = ioData.pointee.mBuffers.mData
+    
+    if let lastDescription = selfAudioConverter.converterDescriptions {
+        lastDescription.deallocate()
+    }
+    
    // Handle packet descriptions for compressed formats (MP3, AAC, etc)
    let fileFormatDescription = fileAudioFormat.streamDescription.pointee
    if fileFormatDescription.mFormatID != kAudioFormatLinearPCM {
@@ -86,6 +96,8 @@ func ConverterListener(_ converter: AudioConverterRef, _ packetCount: UnsafeMuta
        outPacketDescriptions?.pointee?.pointee.mVariableFramesInPacket = 0
    }
    
+    selfAudioConverter.converterDescriptions = outPacketDescriptions?.pointee
+    
    packetCount.pointee = 1
    
    //we've successfully given a packet to the LPCM buffer now we can process the next audio packet
@@ -85,7 +85,9 @@ class AudioParser: AudioParsable {
            return max(AVAudioPacketCount(parsedAudioHeaderPacketCount), AVAudioPacketCount(audioPackets.count))
        }
        
-        guard let sizeOfFileInBytes = expectedFileSizeInBytes, let bytesPerPacket = averageBytesPerPacket else {
+        let sizeOfFileInBytes: UInt64 = expectedFileSizeInBytes != nil ? expectedFileSizeInBytes! : 0
+        
+        guard let bytesPerPacket = averageBytesPerPacket else {
            return AVAudioPacketCount(0)
        }
        
@@ -111,10 +113,13 @@ class AudioParser: AudioParsable {
        didSet {
            if let audioPacketByteSize = audioPackets.last?.0?.mDataByteSize {
                sumOfParsedAudioBytes += audioPacketByteSize
-                numberOfPacketsParsed += 1
+            } else if let audioPacketByteSize = audioPackets.last?.1.count { // for uncompressed audio there are no descriptors to say how many bytes of audio are in this packet so we approximate by data size
+                sumOfParsedAudioBytes += UInt32(audioPacketByteSize)
            }
            
-            //TODO: duration will not work with WAV or AIFF
+            numberOfPacketsParsed += 1
+            
+            //TODO: duration will not be accurate with WAV or AIFF
        }
    }
    
@@ -202,7 +207,7 @@ class AudioParser: AudioParsable {
    private func getOffset(fromPacketIndex index: AVAudioPacketCount) -> UInt64? {
        //Clear current buffer if we have audio format
        guard fileAudioFormat != nil, let bytesPerPacket = self.averageBytesPerPacket else {
-            Log.error("should not get here")
+            Log.error("should not get here \(String(describing: fileAudioFormat)) and \(String(describing: self.averageBytesPerPacket))")
            return nil
        }
        
@@ -295,7 +300,7 @@ extension AudioParser: AudioThrottleDelegate {
            let sID = self.streamID!
            let dataSize = data.count
            
-            let _ = try data.withUnsafeBytes({ (bytes:UnsafePointer<UInt8>) in
+            _ = try data.accessBytes({ (bytes: UnsafePointer<UInt8>) in
                let result:OSStatus = AudioFileStreamParseBytes(sID, UInt32(dataSize), bytes, [])
                guard result == noErr else {
                    Log.monitor(ParserError.failedToParseBytes(result).errorDescription as Any)
@@ -3,7 +3,7 @@
 //  SwiftAudioPlayer
 //
 //  Created by Tanha Kabir on 2019-01-29.
-//  Copyright © 2019 Tanha Kabir, Jon Mercer
+//  Copyright © 2019 Tanha Kabir, Jon Mercer, Moy Inzunza
 //
 //  This file was modified and adapted from https://github.com/syedhali/AudioStreamer
 //  which was released under Apache License 2.0. Apache License 2.0 requires explicit
@@ -32,15 +32,23 @@
 import Foundation
 import AVFoundation

-func ParserPacketListener(_ context: UnsafeMutableRawPointer, _ byteCount: UInt32, _ packetCount: UInt32, _ streamData: UnsafeRawPointer, _ packetDescriptions: UnsafeMutablePointer<AudioStreamPacketDescription>) {
+#if swift(>=5.3)
+func ParserPacketListener (_ context: UnsafeMutableRawPointer, _ byteCount: UInt32, _ packetCount: UInt32, _ streamData: UnsafeRawPointer, _ packetDescriptions: UnsafeMutablePointer<AudioStreamPacketDescription>?) {
+    parserPacket(context, byteCount, packetCount, streamData, packetDescriptions)
+}
+
+#else
+func ParserPacketListener (_ context: UnsafeMutableRawPointer, _ byteCount: UInt32, _ packetCount: UInt32, _ streamData: UnsafeRawPointer, _ packetDescriptions: UnsafeMutablePointer<AudioStreamPacketDescription>) {
+    parserPacket(context, byteCount, packetCount, streamData, packetDescriptions)
+}
+#endif
+
+func parserPacket(_ context: UnsafeMutableRawPointer, _ byteCount: UInt32, _ packetCount: UInt32, _ streamData: UnsafeRawPointer, _ packetDescriptions: UnsafeMutablePointer<AudioStreamPacketDescription>?){
+    
    let selfAudioParser = Unmanaged<AudioParser>.fromOpaque(context).takeUnretainedValue()
    
-    //bug in core audio where this could be nil
-    let packetDescriptionOrNil: UnsafeMutablePointer<AudioStreamPacketDescription>? = packetDescriptions
-    let isCompressed = packetDescriptionOrNil != nil
-    
    guard let fileAudioFormat = selfAudioParser.fileAudioFormat else {
-        Log.monitor("shouldnot have reached packet listener without a data format")
+        Log.monitor("should not have reached packet listener without a data format")
        return
    }
    
@@ -50,15 +58,17 @@ func ParserPacketListener(_ context: UnsafeMutableRawPointer, _ byteCount: UInt3
    }
    
    //TODO refactor this after we get it working
-    if isCompressed {
+    if let compressedPacketDescriptions = packetDescriptions {  // is compressed audio (.mp3)
+        Log.debug("compressed audio")
        for i in 0 ..< Int(packetCount) {
-            let audioPacketDescription = packetDescriptions[i]
+            let audioPacketDescription = compressedPacketDescriptions[i]
            let audioPacketStart = Int(audioPacketDescription.mStartOffset)
            let audioPacketSize = Int(audioPacketDescription.mDataByteSize)
            let audioPacketData = Data(bytes: streamData.advanced(by: audioPacketStart), count: audioPacketSize)
            selfAudioParser.audioPackets.append((audioPacketDescription,audioPacketData))
        }
-    } else {
+    } else { // not compressed audio (.wav)
+        Log.debug("uncompressed audio")
        let format = fileAudioFormat.streamDescription.pointee
        let bytesPerAudioPacket = Int(format.mBytesPerPacket)
        for i in 0 ..< Int(packetCount) {
@@ -68,4 +78,5 @@ func ParserPacketListener(_ context: UnsafeMutableRawPointer, _ byteCount: UInt3
            selfAudioParser.audioPackets.append((nil, audioPacketData))
        }
    }
+    
 }
@@ -29,8 +29,15 @@ import Foundation
 public struct SAAudioAvailabilityRange {
    let startingNeedle: Needle
    let durationLoadedByNetwork: Duration
+    let predictedDurationToLoad: Duration
    let isPlayable: Bool
    
+    public var bufferingProgress: Double {
+        get {
+            return (startingNeedle + durationLoadedByNetwork) / predictedDurationToLoad
+        }
+    }
+    
    public var startingBufferTimePositon: Double {
        get {
            return startingNeedle
@@ -49,7 +56,31 @@ public struct SAAudioAvailabilityRange {
        }
    }
    
+    var secondsLeftToBuffer: Double {
+        get {
+            return predictedDurationToLoad - (startingNeedle + durationLoadedByNetwork)
+        }
+    }
+    
    public func contains(_ needle: Double) -> Bool {
        return needle >= startingNeedle && (needle - startingNeedle) < durationLoadedByNetwork
    }
+    
+    public func reachedEndOfAudio(needle: Double) -> Bool {
+        var needleAtEnd = false
+        
+        if(totalDurationBuffered > 0 && needle > 0) {
+            needleAtEnd = needle >= totalDurationBuffered - 1
+        }
+        
+        // if most of the audio is buffered for long audio or in short audio there isn't many seconds left to buffer it means wwe've reached the end of the audio
+        
+        let isBuffered = (bufferingProgress > 0.99 || secondsLeftToBuffer < 5)
+        
+        return isBuffered && needleAtEnd
+    }
+    
+    public func isCompletelyBuffered() -> Bool {
+        return startingNeedle + durationLoadedByNetwork >= predictedDurationToLoad
+    }
 }
@@ -30,4 +30,5 @@ public enum SAPlayingStatus {
    case playing
    case paused
    case buffering
+    case ended
 }
@@ -35,6 +35,10 @@ protocol LockScreenViewProtocol {
 }

 extension LockScreenViewProtocol {
+    func clearLockScreenInfo() {
+         MPNowPlayingInfoCenter.default().nowPlayingInfo = [:]
+    }
+    
    @available(iOS 10.0, *)
    func setLockScreenInfo(withMediaInfo info: SALockScreenInfo?, duration: Duration) {
        var nowPlayingInfo:[String : Any] = [:]
@@ -32,6 +32,7 @@ protocol AudioDataManagable {
    var allowCellular: Bool { get set }
    
    func setBackgroundCompletionHandler(_ completionHandler: @escaping () -> ())
+    func setAllowCellularDownloadPreference(_ preference: Bool)
    
    func clear()
    
@@ -51,7 +52,7 @@ protocol AudioDataManagable {
 }

 class AudioDataManager: AudioDataManagable {
-    var allowCellular: Bool = false
+    var allowCellular: Bool = true
    
    static let shared: AudioDataManagable = AudioDataManager()
    
@@ -99,6 +100,10 @@ class AudioDataManager: AudioDataManagable {
        backgroundCompletion = completionHandler
    }
    
+    func setAllowCellularDownloadPreference(_ preference: Bool) {
+        allowCellular = preference
+    }
+    
    func attach(callback: @escaping (_ id: ID, _ progress: Double)->()) {
        globalDownloadProgressCallback = callback
    }
@@ -0,0 +1,34 @@
+//
+//  AudioQueue.swift
+//  SwiftAudioPlayer
+//
+//  Created by Joe Williams on 3/10/21.
+//
+
+import Foundation
+
+// wrapper for array of urls
+struct AudioQueue<T> {
+    private var audioUrls: [T] = []
+
+    var isQueueEmpty: Bool {
+        return audioUrls.isEmpty
+    }
+
+    var count: Int {
+        return audioUrls.count
+    }
+
+    var front: T? {
+        return audioUrls.first
+    }
+
+    mutating func append(item: T) {
+        audioUrls.append(item)
+    }
+
+    mutating func dequeue() -> T? {
+        guard !isQueueEmpty else { return nil }
+        return audioUrls.removeFirst()
+    }
+}
@@ -271,21 +271,18 @@ extension AudioDownloadWorker {
            return lhs.id == rhs.id && lhs.remoteUrl == rhs.remoteUrl
        }
        
-        var hashValue: Int {
-            return id.hashValue ^ remoteUrl.hashValue
-        }
-        
        let id: ID
        let remoteUrl: URL
        let rank: Int
        var completionHandlers: [(URL) -> ()]
+        
+        func hash(into hasher: inout Hasher) {
+            hasher.combine(id)
+            hasher.combine(remoteUrl)
+        }
    }
    
    private class ActiveDownload: Hashable {
-        var hashValue: Int {
-            return info.id.hashValue ^ task.hashValue
-        }
-        
        static func == (lhs: AudioDownloadWorker.ActiveDownload, rhs: AudioDownloadWorker.ActiveDownload) -> Bool {
            return lhs.info.id == rhs.info.id
        }
@@ -299,6 +296,11 @@ extension AudioDownloadWorker {
            self.info = info
            self.task = task
        }
+        
+        func hash(into hasher: inout Hasher) {
+            hasher.combine(info.id)
+            hasher.combine(task)
+        }
    }
 }

@@ -103,12 +103,15 @@ extension FileStorage {
        }
        
        static func locate(_ id: ID) -> URL? {
-            let urls = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask)
-            
-            for url in urls {
-                if url.absoluteString.contains(id) && url.pathExtension != "" {
-                    _ = getUrl(givenId: id, andFileExtension: url.pathExtension)
-                    return url
+            let folderUrls = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask)
+            guard folderUrls.count != 0 else { return nil }
+
+            if let urls = try? FileManager.default.contentsOfDirectory(at: folderUrls[0], includingPropertiesForKeys: nil) {
+                for url in urls {
+                    if url.absoluteString.contains(id) && url.pathExtension != "" {
+                        _ = getUrl(givenId: id, andFileExtension: url.pathExtension)
+                        return url
+                    }
                }
            }
            return nil
@@ -243,15 +243,19 @@ extension AudioStreamWorker: URLSessionDataDelegate {
        }
        
        guard self.task == dataTask else {
-            Log.error("stream_error not the same task") //Probably because of seek
+            Log.error("stream_error not the same task 638283") //Probably because of seek
            return
        }
        
-        guard let totalBytesExpected = totalBytesExpectedForCurrentStream, totalBytesExpected > 0 else {
+        guard var totalBytesExpected = totalBytesExpectedForCurrentStream else {
            Log.monitor("should not be called 223r2")
            return
        }
        
+        if totalBytesExpected <= 0 {
+            totalBytesExpected = totalBytesReceived
+        }
+        
        totalBytesReceived = totalBytesReceived + Int64(data.count)
        let progress = Double(totalBytesReceived)/Double(totalBytesExpected)
        
@@ -267,7 +271,7 @@ extension AudioStreamWorker: URLSessionDataDelegate {
        }
        
        guard self.task == dataTask else {
-            Log.error("stream_error not the same task")
+            Log.error("stream_error not the same task 517253")
            return
        }
        
@@ -289,8 +293,8 @@ extension AudioStreamWorker: URLSessionDataDelegate {
            return
        }
        
-        guard self.task == task else {
-            Log.error("stream_error not the same task")
+        if self.task != task && self.task != nil {
+            Log.error("stream_error not the same task 3901833")
            return
        }
        
@@ -27,6 +27,16 @@ import Foundation
 import AVFoundation

 public class SAPlayer {
+    public var DEBUG_MODE: Bool = false {
+        didSet {
+            if(DEBUG_MODE) {
+                logLevel = LogLevel.EXTERNAL_DEBUG
+            } else {
+                logLevel = LogLevel.MONITOR
+            }
+        }
+    }
+    
    /**
     Access to the player.
     */
@@ -35,6 +45,94 @@ public class SAPlayer {
    private var presenter: SAPlayerPresenter!
    private var player: AudioEngine?
    
+    /**
+    Access the engine of the player. Engine is nil if player has not been initialized with audio.
+     
+     - Important: Changes to the engine are not safe guarded, thus unknown behaviour can arise from changing the engine. Just be wary and read [documentation of AVAudioEngine](https://developer.apple.com/documentation/avfoundation/avaudioengine) well when modifying,
+    */
+    public var engine: AVAudioEngine? {
+        get {
+            return player?.engine
+        }
+    }
+    
+    /**
+    Unique ID for the current engine. This will be nil if no audio has been initialized which means no engine exists.
+    */
+    public var engineUID: String? {
+        get {
+            return player?.key
+        }
+    }
+    
+    /**
+    Access the player node of the engine. Node is nil if player has not been initialized with audio.
+     
+     - Important: Changes to the engine and this node are not safe guarded, thus unknown behaviour can arise from changing the engine or this node. Just be wary and read [documentation of AVAudioEngine](https://developer.apple.com/documentation/avfoundation/avaudioengine) well when modifying,
+    */
+    public var playerNode: AVAudioPlayerNode? {
+        get {
+            return player?.playerNode
+        }
+    }
+    
+    /**
+    Corresponding to the overall volume of the player. Volume's default value is 1.0 and the range of valid values is 0.0 to 1.0. Volume is nil if no audio has been initialized yet.
+    */
+    public var volume: Float? {
+        get {
+            return player?.engine.mainMixerNode.volume
+        }
+        
+        set {
+            guard let value = newValue else { return }
+            guard value >= 0.0 && value <= 1.0 else { return }
+            
+            player?.engine.mainMixerNode.volume = value
+        }
+    }
+    
+    /**
+    Corresponding to the rate of audio playback. This rate assumes use of the default rate modifier at the first index of `audioModifiers`; if you removed that modifier than this will be nil. If no audio has been initialized then this will also be nil.
+     
+     - Note: By default this engine has added a pitch modifier node to change the pitch so that on playback rate changes of spoken word the pitch isn't shifted.
+     
+     The component description of this node is:
+     ````
+     var componentDescription: AudioComponentDescription {
+        get {
+            var ret = AudioComponentDescription()
+            ret.componentType = kAudioUnitType_FormatConverter
+            ret.componentSubType = kAudioUnitSubType_AUiPodTimeOther
+            return ret
+        }
+     }
+     ````
+     Please look at [forums.developer.apple.com/thread/5874](https://forums.developer.apple.com/thread/5874) and [forums.developer.apple.com/thread/6050](https://forums.developer.apple.com/thread/6050) for more details.
+     
+     For more details on pitch modifiers for playback rate changes please look at [developer.apple.com/forums/thread/6050](https://developer.apple.com/forums/thread/6050).
+    */
+    public var rate: Float? {
+        get {
+            return (audioModifiers.first as? AVAudioUnitTimePitch)?.rate
+        }
+        
+        set {
+            guard let value = newValue else { return }
+            guard let node = audioModifiers.first as? AVAudioUnitTimePitch else { return }
+            
+            node.rate = value
+            playbackRateOfAudioChanged(rate: value)
+            
+            // if skip silences was on, reset it to have the new rate
+            // TODO fix this to rate being broadcasted and handled in only Features.SkipSilences https://github.com/tanhakabir/SwiftAudioPlayer/issues/77
+//            if Features.SkipSilences.enabled && !(value == rate ?? 1.0 - 0.5 || value == rate ?? 1.0 + 0.5) {
+//                _ = Features.SkipSilences.disable()
+//                _ = Features.SkipSilences.enable()
+//            }
+        }
+    }
+    
    /**
     Corresponding to the skipping forward button on the media player on the lockscreen. Default is set to 30 seconds.
     */
@@ -72,11 +170,28 @@ public class SAPlayer {
         }
         ````
         Please look at [forums.developer.apple.com/thread/5874](https://forums.developer.apple.com/thread/5874) and [forums.developer.apple.com/thread/6050](https://forums.developer.apple.com/thread/6050) for more details.
+     
+     For more details on pitch modifiers for playback rate changes please look at [developer.apple.com/forums/thread/6050](https://developer.apple.com/forums/thread/6050).
+     
+     To remove this default pitch modifier for playback rate changes, remove the node by calling `SAPlayer.shared.clearAudioModifiers()`.
     */
    public var audioModifiers: [AVAudioUnit] = []
    
+    /**
+     List of audio URLs queued for playback.
+     */
+    public var audioQueued: [URL] {
+        get {
+            return presenter.audioQueue.map { (queued) -> URL in
+                return queued.1
+            }
+        }
+    }
+    
    /**
     Total duration of current audio initialized. Returns nil if no audio is initialized in player.
+     
+     - Note: If you are streaming from a source that does not have an expected size at the beginning of a stream, such as live streams, this value will be constantly updating to best known value at the time.
     */
    public var duration: Double? {
        get {
@@ -142,6 +257,22 @@ public class SAPlayer {
        audioModifiers.append(AVAudioUnitTimePitch(audioComponentDescription: componentDescription))
    }
    
+    /**
+     Clears all [AVAudioUnit](https://developer.apple.com/documentation/avfoundation/audio_track_engineering/audio_engine_building_blocks/audio_enhancements) modifiers intended to be used for realtime audio manipulation.
+     */
+    public func clearAudioModifiers() {
+        audioModifiers.removeAll()
+    }
+    
+    /**
+     Append an [AVAudioUnit](https://developer.apple.com/documentation/avfoundation/audio_track_engineering/audio_engine_building_blocks/audio_enhancements) modifier to the list of modifiers used for realtime audio manipulation. The modifier will be added to the end of the list.
+
+     - Parameter modifier: The modifier to append.
+     */
+    public func addAudioModifier(_ modifer: AVAudioUnit) {
+        audioModifiers.append(modifer)
+    }
+    
    /**
     Formats a textual representation of a given timestamp for display in hh:MM:SS format, that is hours:minutes:seconds.

@@ -169,21 +300,27 @@ public class SAPlayer {
 //MARK: - External Player Controls
 extension SAPlayer {
    /**
-     Toggles between the play and pause state of the player if the player is not buffering (thus is playable).
+     Toggles between the play and pause state of the player. If nothing is playable (aka still in buffering state or no audio is initialized) no action will be taken. Please call `startSavedAudio` or `startRemoteAudio` to set up the player with audio before this.
+     
+     - Note: If you are streaming, wait till the status from `SAPlayer.Updates.PlayingStatus` is not `.buffering`.
     */
    public func togglePlayAndPause() {
        presenter.handleTogglePlayingAndPausing()
    }
    
    /**
-     Attempts to play the player even if nothing playable is loaded (aka still in buffering state or no audio is initialized).
+     Attempts to play the player. If nothing is playable (aka still in buffering state or no audio is initialized) no action will be taken. Please call `startSavedAudio` or `startRemoteAudio` to set up the player with audio before this.
+     
+     - Note: If you are streaming, wait till the status from `SAPlayer.Updates.PlayingStatus` is not `.buffering`.
     */
    public func play() {
        presenter.handlePlay()
    }
    
    /**
-     Attempts to pause the player even if nothing playable is loaded (aka still in buffering state or no audio is initialized).
+     Attempts to pause the player. If nothing is playable (aka still in buffering state or no audio is initialized) no action will be taken. Please call `startSavedAudio` or `startRemoteAudio` to set up the player with audio before this.
+     
+     - Note:If you are streaming, wait till the status from `SAPlayer.Updates.PlayingStatus` is not `.buffering`.
     */
    public func pause() {
        presenter.handlePause()
@@ -221,6 +358,23 @@ extension SAPlayer {
    /**
     If using an AVAudioUnitTimePitch, it's important to notify the player that the rate at which the audio playing has changed to keep the media player in the lockscreen up to date. This is only important for playback rate changes.
     
+     - Note: By default this engine has added a pitch modifier node to change the pitch so that on playback rate changes of spoken word the pitch isn't shifted.
+     
+     The component description of this node is:
+     ````
+     var componentDescription: AudioComponentDescription {
+        get {
+            var ret = AudioComponentDescription()
+            ret.componentType = kAudioUnitType_FormatConverter
+            ret.componentSubType = kAudioUnitSubType_AUiPodTimeOther
+            return ret
+        }
+     }
+     ````
+     Please look at [forums.developer.apple.com/thread/5874](https://forums.developer.apple.com/thread/5874) and [forums.developer.apple.com/thread/6050](https://forums.developer.apple.com/thread/6050) for more details.
+     
+     For more details on pitch modifiers for playback rate changes please look at [developer.apple.com/forums/thread/6050](https://developer.apple.com/forums/thread/6050).
+     
     - Parameter rate: The current rate at which the audio is playing.
     */
    public func playbackRateOfAudioChanged(rate: Float) {
@@ -232,43 +386,124 @@ extension SAPlayer {
     
     - Important: If intending to use [AVAudioUnit](https://developer.apple.com/documentation/avfoundation/audio_track_engineering/audio_engine_building_blocks/audio_enhancements) audio modifiers during playback, the list of audio modifiers under `SAPlayer.shared.audioModifiers` must be finalized before calling this function. After all realtime audio manipulations within the this will be effective.
     
+     - Note: The default list already has an AVAudioUnitTimePitch node first in the list. This node is specifically set to change the rate of audio without changing the pitch of the audio (intended for changing the rate of spoken word).
+     
+         The component description of this node is:
+         ````
+         var componentDescription: AudioComponentDescription {
+            get {
+                var ret = AudioComponentDescription()
+                ret.componentType = kAudioUnitType_FormatConverter
+                ret.componentSubType = kAudioUnitSubType_AUiPodTimeOther
+                return ret
+            }
+         }
+         ````
+         Please look at [forums.developer.apple.com/thread/5874](https://forums.developer.apple.com/thread/5874) and [forums.developer.apple.com/thread/6050](https://forums.developer.apple.com/thread/6050) for more details.
+     
+     To remove this default pitch modifier for playback rate changes, remove the node by calling `SAPlayer.shared.clearAudioModifiers()`.
+     
     - Parameter withSavedUrl: The URL of the audio saved on the device.
     - Parameter mediaInfo: The media information of the audio to show on the lockscreen media player (optional).
     */
+    public func startSavedAudio(withSavedUrl url: URL, mediaInfo: SALockScreenInfo? = nil) {
+        self.mediaInfo = mediaInfo
+        presenter.handlePlaySavedAudio(withSavedUrl: url)
+    }
+    
+    @available(*, deprecated, renamed: "startSavedAudio")
    public func initializeSavedAudio(withSavedUrl url: URL, mediaInfo: SALockScreenInfo? = nil) {
        self.mediaInfo = mediaInfo
        presenter.handlePlaySavedAudio(withSavedUrl: url)
    }
    
    /**
-     Sets up player to play audio that will be streamed from a remote location.
+     Sets up player to play audio that will be streamed from a remote location. After this is called, it will connect to the server and start to receive and process data. The player is not playable the SAAudioAvailabilityRange notifies that player is ready for playing (you can subscribe to these updates through `SAPlayer.Updates.StreamingBuffer`). You can alternatively see when the player is available to play by subscribing to `SAPlayer.Updates.PlayingStatus` and waiting for a status that isn't `.buffering`.
     
     - Important: If intending to use [AVAudioUnit](https://developer.apple.com/documentation/avfoundation/audio_track_engineering/audio_engine_building_blocks/audio_enhancements) audio modifiers during playback, the list of audio modifiers under `SAPlayer.shared.audioModifiers` must be finalized before calling this function. After all realtime audio manipulations within the this will be effective.
     
+     - Note: The default list already has an AVAudioUnitTimePitch node first in the list. This node is specifically set to change the rate of audio without changing the pitch of the audio (intended for changing the rate of spoken word).
+     
+         The component description of this node is:
+         ````
+         var componentDescription: AudioComponentDescription {
+            get {
+                var ret = AudioComponentDescription()
+                ret.componentType = kAudioUnitType_FormatConverter
+                ret.componentSubType = kAudioUnitSubType_AUiPodTimeOther
+                return ret
+            }
+         }
+         ````
+         Please look at [forums.developer.apple.com/thread/5874](https://forums.developer.apple.com/thread/5874) and [forums.developer.apple.com/thread/6050](https://forums.developer.apple.com/thread/6050) for more details.
+     
+     To remove this default pitch modifier for playback rate changes, remove the node by calling `SAPlayer.shared.clearAudioModifiers()`.
+     
     - Note: Subscribe to `SAPlayer.Updates.StreamingBuffer` to see updates in streaming progress.
     
     - Parameter withRemoteUrl: The URL of the remote audio.
     - Parameter mediaInfo: The media information of the audio to show on the lockscreen media player (optional).
     */
+    public func startRemoteAudio(withRemoteUrl url: URL, mediaInfo: SALockScreenInfo? = nil) {
+        self.mediaInfo = mediaInfo
+        presenter.handlePlayStreamedAudio(withRemoteUrl: url)
+    }
+    
+    @available(*, deprecated, renamed: "startRemoteAudio")
    public func initializeRemoteAudio(withRemoteUrl url: URL, mediaInfo: SALockScreenInfo? = nil) {
        self.mediaInfo = mediaInfo
        presenter.handlePlayStreamedAudio(withRemoteUrl: url)
    }
+    
+    /**
+     Stops any streaming in progress.
+     */
+    public func stopStreamingRemoteAudio() {
+        presenter.handleStopStreamingAudio()
+    }
+    
+    /**
+     Queues remote audio to be played next. The URLs in the queue can be both remote or on disk but once the queued audio starts playing it will start buffering and loading then. This means no guarantee for a 'gapless' playback where there might be several moments in between one audio ending and another starting due to buffering remote audio.
+     
+     - Parameter withRemoteUrl: The URL of the remote audio.
+     */
+    public func queueRemoteAudio(withRemoteUrl url: URL) {
+        presenter.handleQueueStreamedAudio(withRemoteUrl: url)
+    }
+    
+    /**
+     Queues saved audio to be played next. The URLs in the queuecan be both remote or on disk but once the queued audio starts playing it will start buffering and loading then. This means no guarantee for a 'gapless' playback where there might be several moments in between one audio ending and another starting due to buffering remote audio.
+     
+     - Parameter withSavedUrl: The URL of the audio saved on the device.
+     */
+    public func queueSavedAudio(withSavedUrl url: URL) {
+        presenter.handleQueueSavedAudio(withSavedUrl: url)
+    }
+    
+    /**
+     Resets the player to the state before initializing audio and setting media info.
+     */
+    public func clear() {
+        presenter.handleClear()
+    }
 }


 //MARK: - Internal implementation of delegate
 extension SAPlayer: SAPlayerDelegate {
    func startAudioDownloaded(withSavedUrl url: AudioURL) {
-        player?.pause()
-        player?.invalidate()
        player = AudioDiskEngine(withSavedUrl: url, delegate: presenter)
    }
    
    func startAudioStreamed(withRemoteUrl url: AudioURL) {
+        player = AudioStreamEngine(withRemoteUrl: url, delegate: presenter)
+    }
+    
+    func clearEngine() {
        player?.pause()
        player?.invalidate()
-        player = AudioStreamEngine(withRemoteUrl: url, delegate: presenter)
+        player = nil
+        Log.info("cleared engine")
    }
    
    func playEngine() {
@@ -32,6 +32,7 @@ protocol SAPlayerDelegate: AnyObject, LockScreenViewProtocol {
    
    func startAudioDownloaded(withSavedUrl url: AudioURL)
    func startAudioStreamed(withRemoteUrl url: AudioURL)
+    func clearEngine()
    func playEngine()
    func pauseEngine()
    func seekEngine(toNeedle needle: Needle) //TODO ensure that engine cleans up out of bounds
@@ -100,5 +100,14 @@ extension SAPlayer {
        public static func setBackgroundCompletionHandler(_ completionHandler: @escaping () -> ()) {
            AudioDataManager.shared.setBackgroundCompletionHandler(completionHandler)
        }
+        
+        /**
+         Whether downloading audio on cellular data is allowed. By default this is set to `true`.
+         */
+        public static var allowUsingCellularData = true {
+            didSet {
+                AudioDataManager.shared.setAllowCellularDownloadPreference(allowUsingCellularData)
+            }
+        }
    }
 }
@@ -0,0 +1,123 @@
+//
+//  SAPlayerFeature.swift
+//  SwiftAudioPlayer
+//
+//  Created by Tanha Kabir on 3/10/21.
+//
+
+import Foundation
+import AVFoundation
+
+extension SAPlayer {
+    /**
+     Special features for audio manipulation. These are examples of manipulations you can do with the player outside of this library. This is just an aggregation of community contibuted ones.
+     
+     - Note: These features assume default state of the player and `audioModifiers` meaning some expect the first audio modifier to be the default `AVAudioUnitTimePitch` that comes with the SAPlayer.
+     */
+    public struct Features {
+        
+        /**
+         Feature to skip silences in spoken word audio. The player will speed up the rate of audio playback when silence is detected.
+         
+         - Important: The first audio modifier must be the default `AVAudioUnitTimePitch` that comes with the SAPlayer for this feature to work.
+         */
+        public struct SkipSilences {
+            
+            static var enabled: Bool = false
+            
+            /**
+             Enable feature to skip silences in spoken word audio. The player will speed up the rate of audio playback when silence is detected. This can be called at any point of audio playback.
+             
+             - Important: The first audio modifier must be the default `AVAudioUnitTimePitch` that comes with the SAPlayer for this feature to work.
+             */
+            public static func enable() -> Bool {
+                guard let engine = SAPlayer.shared.engine else { return false }
+                
+                Log.info("enabling skip silences feature")
+                enabled = true
+                let originalRate = SAPlayer.shared.rate ?? 1.0
+                let format = engine.mainMixerNode.outputFormat(forBus: 0)
+                
+                
+                // look at documentation here to get an understanding of what is happening here: https://www.raywenderlich.com/5154-avaudioengine-tutorial-for-ios-getting-started#toc-anchor-005
+                engine.mainMixerNode.installTap(onBus: 0, bufferSize: 1024, format: format) { buffer, when in
+                    guard let channelData = buffer.floatChannelData else {
+                        return
+                    }
+
+                    let channelDataValue = channelData.pointee
+                    let channelDataValueArray = stride(from: 0,
+                                                       to: Int(buffer.frameLength),
+                                                       by: buffer.stride).map { channelDataValue[$0] }
+
+                    let rms = sqrt(channelDataValueArray.map { $0 * $0 }.reduce(0, +) / Float(buffer.frameLength))
+
+                    let avgPower = 20 * log10(rms)
+
+                    let meterLevel = self.scaledPower(power: avgPower)
+                    Log.debug("meterLevel: \(meterLevel)")
+                    if meterLevel < 0.6 { // below 0.6 decibels is below audible audio
+                        SAPlayer.shared.rate = originalRate + 0.5
+                        Log.test("speed up rate to \(String(describing: SAPlayer.shared.rate))")
+                    } else {
+                        SAPlayer.shared.rate = originalRate
+                        Log.test("slow down rate to \(String(describing: SAPlayer.shared.rate))")
+                    }
+                }
+                
+                return true
+            }
+            
+            /**
+             Disable feature to skip silences in spoken word audio. The player will speed up the rate of audio playback when silence is detected. This can be called at any point of audio playback.
+             
+             - Important: The first audio modifier must be the default `AVAudioUnitTimePitch` that comes with the SAPlayer for this feature to work.
+             */
+            public static func disable() -> Bool {
+                // TODO fix disabling on speed up portion and being stuck at faster speed https://github.com/tanhakabir/SwiftAudioPlayer/issues/76
+                guard let engine = SAPlayer.shared.engine else { return false }
+                Log.info("disabling skip silences feature")
+                engine.mainMixerNode.removeTap(onBus: 0)
+                enabled = false
+                return true
+            }
+            
+            private static func scaledPower(power: Float) -> Float {
+                guard power.isFinite else { return 0.0 }
+                let minDb: Float = -80.0
+                if power < minDb {
+                    return 0.0
+                } else if power >= 1.0 {
+                    return 1.0
+                } else {
+                    return (abs(minDb) - abs(power)) / abs(minDb)
+                }
+            }
+        }
+        
+        /**
+         Feature to pause the player after a delay. This will happen regardless of if another audio clip has started.
+         */
+        public struct SleepTimer {
+            static var timer: Timer?
+            
+            /**
+             Enable feature to pause the player after a delay. This will happen regardless of if another audio clip has started.
+             
+             - Parameter afterDelay: The number of seconds to wait before pausing the audio
+             */
+            public static func enable(afterDelay delay: Double) {
+                timer = Timer.scheduledTimer(withTimeInterval: delay, repeats: false, block: { _ in
+                    SAPlayer.shared.pause()
+                })
+            }
+            
+            /**
+             Disable feature to pause the player after a delay. 
+             */
+            public static func disable() {
+                timer?.invalidate()
+            }
+        }
+    }
+}
@@ -28,6 +28,11 @@ import AVFoundation
 import MediaPlayer

 class SAPlayerPresenter {
+    enum Location {
+        case remote
+        case disk
+    }
+    
    weak var delegate: SAPlayerDelegate?
    var shouldPlayImmediately = false //for auto-play
    
@@ -43,13 +48,12 @@ class SAPlayerPresenter {
    var durationRef:UInt = 0
    var needleRef:UInt = 0
    var playingStatusRef:UInt = 0
+    var audioQueue: [(Location, URL)] = []
    
    init(delegate: SAPlayerDelegate?) {
        self.delegate = delegate
        
        delegate?.setLockScreenControls(presenter: self)
-        
-        prepareNextEpisodeToPlay()
    }
    
    func getUrl(forKey key: Key) -> URL? {
@@ -60,20 +64,48 @@ class SAPlayerPresenter {
        urlKeyMap[url.key] = url
    }
    
+    func handleClear() {
+        delegate?.clearEngine()
+        
+        needle = nil
+        duration = nil
+        key = nil
+        mediaInfo = nil
+        delegate?.clearLockScreenInfo()
+        
+        AudioClockDirector.shared.detachFromChangesInDuration(withID: durationRef)
+        AudioClockDirector.shared.detachFromChangesInNeedle(withID: needleRef)
+        AudioClockDirector.shared.detachFromChangesInPlayingStatus(withID: playingStatusRef)
+    }
+    
    func handlePlaySavedAudio(withSavedUrl url: URL) {
+        // Because we support queueing, we want to clear off any existing players.
+        // Therefore, instantiate new player every time, destroy any existing ones.
+        // This prevents a crash where an owning engine already exists.
+        handleClear()
        attachForUpdates(url: url)
        delegate?.startAudioDownloaded(withSavedUrl: url)
    }
    
    func handlePlayStreamedAudio(withRemoteUrl url: URL) {
+        // Because we support queueing, we want to clear off any existing players.
+        // Therefore, instantiate new player every time, destroy any existing ones.
+        // This prevents a crash where an owning engine already exists.
+        handleClear()
        attachForUpdates(url: url)
        delegate?.startAudioStreamed(withRemoteUrl: url)
    }
    
+    func handleQueueStreamedAudio(withRemoteUrl url: URL) {
+        audioQueue.append((.remote, url))
+    }
+    
+    func handleQueueSavedAudio(withSavedUrl url: URL) {
+        audioQueue.append((.disk, url))
+    }
+    
    private func attachForUpdates(url: URL) {
-        AudioClockDirector.shared.detachFromChangesInDuration(withID: durationRef)
-        AudioClockDirector.shared.detachFromChangesInNeedle(withID: needleRef)
-        AudioClockDirector.shared.detachFromChangesInPlayingStatus(withID: playingStatusRef)
+        detachFromUpdates()
        
        self.key = url.key
        urlKeyMap[url.key] = url
@@ -110,9 +142,29 @@ class SAPlayerPresenter {
            }
            
            self.isPlaying = isPlaying
+            
+            if(self.isPlaying == .paused && self.shouldPlayImmediately) {
+                self.shouldPlayImmediately = false
+                self.handlePlay()
+            }
+            
+            if(self.isPlaying == .ended) {
+                self.playNextAudioIfExists()
+            }
        })
    }
    
+    private func detachFromUpdates() {
+        AudioClockDirector.shared.detachFromChangesInDuration(withID: durationRef)
+        AudioClockDirector.shared.detachFromChangesInNeedle(withID: needleRef)
+        AudioClockDirector.shared.detachFromChangesInPlayingStatus(withID: playingStatusRef)
+    }
+    
+    func handleStopStreamingAudio() {
+        delegate?.clearEngine()
+        detachFromUpdates()
+    }
+    
    @available(iOS 10.0, *)
    func handleLockscreenInfo(info: SALockScreenInfo?) {
        self.mediaInfo = info
@@ -175,17 +227,38 @@ extension SAPlayerPresenter: AudioEngineDelegate {
    func didError() {
        Log.monitor("We should have handled engine error")
    }
-    
-    func didEndPlaying() {
-        // TODO
-//        playNextEpisode()
-    }
 }

 //MARK:- Autoplay
-//FIXME: This needs to be refactored
 extension SAPlayerPresenter {
-    func prepareNextEpisodeToPlay() {
-        // TODO
+    func playNextAudioIfExists() {
+        Log.info("looking foor next audio in queue to play")
+        guard audioQueue.count > 0 else {
+            Log.info("no queued audio")
+            return
+        }
+        let nextAudioURL = audioQueue.removeFirst()
+        let key = nextAudioURL.1.key
+        
+
+        Log.info("getting ready to play \(nextAudioURL)")
+        AudioQueueDirector.shared.changeInQueue(key, url: nextAudioURL.1)
+        
+        handleClear()
+        
+        // We need to give a second to clean up the previous engine properly. Deinit takes some time.
+        Timer.scheduledTimer(withTimeInterval: 1.0, repeats: false) { [weak self] (_) in
+            guard let self = self else { return }
+            
+            switch nextAudioURL.0 {
+            case .remote:
+                self.handlePlayStreamedAudio(withRemoteUrl: nextAudioURL.1)
+                break
+            case .disk:
+                self.handlePlaySavedAudio(withSavedUrl: nextAudioURL.1)
+            }
+            
+            self.shouldPlayImmediately = true
+        }
    }
 }
@@ -66,12 +66,16 @@ extension SAPlayer {
        
        /**
         Updates to changes in the duration of the current initialized audio. Especially helpful for audio that is being streamed and can change with more data.
+         
+         - Note: If you are streaming from a source that does not have an expected size at the beginning of a stream, such as live streams, duration will be constantly updating to best known value at the time (which is the seconds buffered currently and not necessarily the actual total duration of audio).
         */
        public struct Duration {
            
            /**
             Subscribe to updates to changes in duration of the current audio initialized.
             
+             - Note: If you are streaming from a source that does not have an expected size at the beginning of a stream, such as live streams, duration will be constantly updating to best known value at the time (which is the seconds buffered currently and not necessarily the actual total duration of audio).
+             
             - Note: It's recommended to have a weak reference to a class that uses this function
             
             - Parameter closure: The closure that will receive the updates of the changes in duration.
@@ -136,6 +140,8 @@ extension SAPlayer {
            /**
             Subscribe to updates to changes in the progress of downloading audio for streaming. Information about range of audio available and if the audio is playable. Look at SAAudioAvailabilityRange for more information. For progress of downloading audio that saves to the phone for playback later, look at AudioDownloading instead.
             
+             - Note: For live streams that don't have an expected audio length from the beginning of the stream; the duration is constantly changing and equal to the total seconds buffered from the SAAudioAvailabilityRange.
+             
             - Note: It's recommended to have a weak reference to a class that uses this function
             
             - Parameter closure: The closure that will receive the updates of the changes in duration.
@@ -191,6 +197,30 @@ extension SAPlayer {
                DownloadProgressDirector.shared.detach(withID: id)
            }
        }
+        
+        public struct AudioQueue {
+            /**
+             Subscribe to updates to changes in the progress of your audio queue. When streaming audio playback completes
+             and continues onto the next track, the closure is invoked.
+             - Note: It's recommended to have a weak reference to a class that uses this function
+             - Parameter closure: The closure that will receive the updates of the changes in duration.
+             - Parameter url: The corresponding remote URL for the forthcoming audio file.
+             - Returns: the id for the subscription in the case you would like to unsubscribe to updates for the closure.
+             */
+            public static func subscribe(_ closure: @escaping (_ key: String, _ newUrl: URL) -> ()) -> UInt {
+                return AudioQueueDirector.shared.attach(closure: { (key, url) in
+                    closure(key, url)
+                })
+            }
+
+            /**
+             Stop recieving updates of changes in download progress.
+             - Parameter id: The closure with this id will stop receiving updates.
+             */
+            public static func unsubscribe(_ id: UInt) {
+                AudioQueueDirector.shared.detach(withID: id)
+            }
+        }
    }
 }

@@ -0,0 +1,54 @@
+//
+//  Data.swift
+//  SwiftAudioPlayer
+//
+//  Created by Tanha Kabir on 2019-11-29.
+//  Copyright © 2019 Tanha Kabir, Jon Mercer
+//
+//  Permission is hereby granted, free of charge, to any person obtaining a copy
+//  of this software and associated documentation files (the "Software"), to deal
+//  in the Software without restriction, including without limitation the rights
+//  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+//  copies of the Software, and to permit persons to whom the Software is
+//  furnished to do so, subject to the following conditions:
+//
+//  The above copyright notice and this permission notice shall be included in
+//  all copies or substantial portions of the Software.
+//
+//  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+//  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+//  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+//  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+//  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+//  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+//  THE SOFTWARE.
+
+import Foundation
+
+extension Data {
+    // Introduced in Swift 5, withUnsafeBytes using UnsafePointers is deprecated
+    // https://mjtsai.com/blog/2019/03/27/swift-5-released/
+    func accessBytes<R>(_ body: (UnsafePointer<UInt8>) throws -> R) rethrows -> R {
+        return try withUnsafeBytes { (rawBufferPointer: UnsafeRawBufferPointer) -> R in
+            let unsafeBufferPointer = rawBufferPointer.bindMemory(to: UInt8.self)
+            guard let unsafePointer = unsafeBufferPointer.baseAddress else {
+                Log.error("")
+                var int: UInt8 = 0
+                return try body(&int)
+            }
+            return try body(unsafePointer)
+        }
+    }
+    
+    mutating func accessMutableBytes<R>(_ body: (UnsafeMutablePointer<UInt8>) throws -> R) rethrows -> R {
+        return try withUnsafeMutableBytes { (rawBufferPointer: UnsafeMutableRawBufferPointer) -> R in
+            let unsafeMutableBufferPointer = rawBufferPointer.bindMemory(to: UInt8.self)
+            guard let unsafeMutablePointer = unsafeMutableBufferPointer.baseAddress else {
+                Log.error("")
+                var int: UInt8 = 0
+                return try body(&int)
+            }
+            return try body(unsafeMutablePointer)
+        }
+    }
+}
@@ -9,22 +9,23 @@
 import Foundation
 import os.log

+// Possible levels of log messages to log
+enum LogLevel: Int {
+    case DEBUG = 1
+    case INFO = 2
+    case WARN = 3
+    case ERROR = 4
+    case EXTERNAL_DEBUG = 5
+    case MONITOR = 6
+    case TEST = 7
+}
+
+// Specify which types of log messages to display. Default level is set to WARN, which means Log will print any log messages of type only WARN, ERROR, MONITOR, and TEST. To print DEBUG and INFO logs, set the level to a lower value.
+var logLevel: LogLevel = LogLevel.MONITOR
+
 class Log {
    private init() {}
    
-    // Possible levels of log messages to log
-    public enum LogLevel: Int {
-        case DEBUG = 1
-        case INFO = 2
-        case WARN = 3
-        case ERROR = 4
-        case MONITOR = 5
-        case TEST = 6
-    }
-    
-    // Specify which types of log messages to display. Default level is set to WARN, which means Log will print any log messages of type only WARN, ERROR, MONITOR, and TEST. To print DEBUG and INFO logs, set the level to a lower value.
-    public static var logLevel: LogLevel = LogLevel.MONITOR
-    
    // Used for OSLog
    private static let SUBSYSTEM: String = "com.SwiftAudioPlayer"
    
@@ -68,6 +69,11 @@ class Log {
            let log = OSLog(subsystem: SUBSYSTEM, category: "ERROR 🛑🛑🛑🛑")
            os_log("%@:%@:%d:: %@", log: log, fileName, functionName, lineNumber, "\(logMessage)")
        }
+        
+        if logLevel.rawValue <= LogLevel.EXTERNAL_DEBUG.rawValue {
+            let log = OSLog(subsystem: SUBSYSTEM, category: "WARNING")
+            os_log("%@:%@:%d:: %@", log: log, fileName, functionName, lineNumber, "\(logMessage)")
+        }
    }
    
    /**
@@ -86,7 +92,7 @@ class Log {
    public static func monitor(_ logMessage: Any, classPath: String = #file, functionName: String = #function, lineNumber: Int = #line) {
        let fileName = URLUtil.getNameFromStringPath(classPath)
        if logLevel.rawValue <= LogLevel.ERROR.rawValue {
-            let log = OSLog(subsystem: SUBSYSTEM, category: "MONITOR 🔥🔥🔥🔥")
+            let log = OSLog(subsystem: SUBSYSTEM, category: "ERROR 🔥🔥🔥🔥")
            os_log("%@:%@:%d:: %@", log: log, fileName, functionName, lineNumber, "\(logMessage)")
        }
    }
@@ -110,6 +116,11 @@ class Log {
            let log = OSLog(subsystem: SUBSYSTEM, category: "WARN  ⚠️⚠️⚠️⚠️")
            os_log("%@:%@:%d:: %@", log: log, fileName, functionName, lineNumber, "\(logMessage)")
        }
+        
+        if logLevel.rawValue <= LogLevel.EXTERNAL_DEBUG.rawValue {
+            let log = OSLog(subsystem: SUBSYSTEM, category: "DEBUG")
+            os_log("%@:%@:%d:: %@", log: log, fileName, functionName, lineNumber, "\(logMessage)")
+        }
    }
    
    /**
@@ -8,7 +8,7 @@

 Pod::Spec.new do |s|
  s.name             = 'SwiftAudioPlayer'
-  s.version          = '1.3.0'
+  s.version          = '4.1.0'
  s.summary          = 'SwiftAudioPlayer is a Swift based audio player that can handle streaming from a remote location and audio manipulation.'

 # This description is used to generate tags and improve search results.
@@ -31,7 +31,7 @@ SwiftAudioPlayer is a Swift based audio player that can handle streaming from a
  s.ios.deployment_target = '10.0'

  s.source_files = 'Source/**/*'
-  s.swift_version = '4.2'
+  s.swift_version = '5.0'
  
  # s.resource_bundles = {
  #   'SwiftAudioPlayer' => ['SwiftAudioPlayer/Assets/*.png']
Author	SHA1	Message	Date
tanhakabir	97909bacce	Release 4.1.0	2021-03-22 23:04:53 -07:00
tanhakabir	30b0189f61	Merge Fix PCM memory leak #87	2021-03-22 23:01:35 -07:00
tanhakabir	5bde849bf0	fix PCM memory leak	2021-03-22 23:00:35 -07:00
tanhakabir	b3b519ab4c	Revert "audio skips, but reusing same pcm buffers" This reverts commit `f3b62cc756`.	2021-03-22 22:49:31 -07:00
tanhakabir	f3b62cc756	audio skips, but reusing same pcm buffers	2021-03-22 11:52:29 -07:00
tanhakabir	a56d3314ad	Update README.md	2021-03-22 11:50:53 -07:00
tanhakabir	f75d743cd9	small refractor	2021-03-20 11:59:06 -07:00
tanhakabir	f8876d821e	remove unnecessary recursion helper	2021-03-20 11:54:56 -07:00
tanhakabir	bca8fde2de	Release 4.0.0	2021-03-18 00:57:00 -07:00
tanhakabir	efbaa465b2	remove unused functions	2021-03-18 00:44:30 -07:00
tanhakabir	20f1d72058	implement basic autoplay	2021-03-18 00:44:30 -07:00
tanhakabir	6c3b1efe97	fully implement queuing audio	2021-03-18 00:44:30 -07:00
tanhakabir	a98f090b6a	checkpoint, timer has strong reference to engine	2021-03-18 00:44:30 -07:00
tanhakabir	542f65f044	add initial queuing functionality from Joe but this will crash Co-Authored-By: Joe Williams <14778951+jw1540@users.noreply.github.com>	2021-03-18 00:44:30 -07:00
tanhakabir	f4a1141f65	clean up project	2021-03-18 00:44:30 -07:00
tanhakabir	a034c7dc6f	reset project settings	2021-03-18 00:44:30 -07:00
tanhakabir	d9c6d18921	Fix initial state of feature switches to off	2021-03-10 17:41:53 -08:00
tanhakabir	7eb3d601fa	Add minor documentation to skip silences feature Co-Authored-By: Joe Williams <14778951+jw1540@users.noreply.github.com>	2021-03-10 14:43:19 -08:00
tanhakabir	9b375b99dc	Release 3.0.0	2021-03-10 14:37:13 -08:00
tanhakabir	ee80976e92	add sleep timer feature Co-Authored-By: Joe Williams <14778951+jw1540@users.noreply.github.com>	2021-03-10 14:25:43 -08:00
tanhakabir	10aea39cae	expose ID for current player	2021-03-10 14:25:43 -08:00
tanhakabir	431fdc6428	add rate as a core property of SAPlayer (#78 )	2021-03-10 14:05:58 -08:00
tanhakabir	eda60a3c3d	remove random audio modifiers to see skip silences in work	2021-03-10 12:59:02 -08:00
tanhakabir	d7b90f1f58	use Joe's original rate for speeding through silences Co-Authored-By: Joe Williams <14778951+jw1540@users.noreply.github.com>	2021-03-10 12:59:02 -08:00
tanhakabir	08b30307aa	Add PR from Joe for skipping silences Co-Authored-By: Joe Williams <14778951+jw1540@users.noreply.github.com>	2021-03-10 12:59:02 -08:00
tanhakabir	751ca765d5	Release 2.13.0	2021-03-06 19:51:39 -08:00
tanhakabir	68ea5a9468	fix crash on uncompressed audio (#69 )	2021-03-06 19:50:18 -08:00
tanhakabir	46ab845c8e	Release 2.12.0	2021-02-22 22:47:40 -08:00
tanhakabir	b597704115	Fix locating files in downloads Co-Authored-By: fayinsky <38639193+fayinsky@users.noreply.github.com>	2021-02-22 22:42:27 -08:00
tanhakabir	889e2257ab	Add documentation for supported file types (#63 )	2021-02-22 22:37:26 -08:00
tanhakabir	e962008b4c	Fix freezing on seek (#62 )	2021-02-22 22:32:54 -08:00
tanhakabir	d6c1d13d7d	create API for setting preference for downloading on cellular data (#61 ) * set cellular downloads to true to allow for simulator downloads * add documentation	2021-02-22 22:13:36 -08:00
tanhakabir	922a794d09	remove noisey logs	2021-02-22 21:48:34 -08:00
tanhakabir	96092a208c	Add files per Xcode 9.3	2021-02-22 17:37:07 -08:00
tanhakabir	b71729035d	Open up access to playerNode (#60 )	2021-02-22 17:34:59 -08:00
tanhakabir	2abba6f0cc	Release 2.11.0	2020-10-22 12:22:20 -07:00
tanhakabir	f081b7549d	add endpoint to remove default pitch modifier (#51 )	2020-10-22 11:59:01 -07:00
tanhakabir	55fbae7b4a	Update README to include module name for import (#47 )	2020-09-19 16:02:46 -07:00
tanhakabir	2acbde2efa	Release 2.10.0	2020-09-19 15:52:25 -07:00
Moises Inzunza	acbdf05d4f	Fixed bug in swift 5.3 (#46 )	2020-09-19 12:19:50 -07:00
Tanha	c325caa914	Release 2.9.0	2020-03-06 23:53:42 -08:00
tanhakabir	dd54d81573	implement streaming cancellation (#32 ) * cancels streaming initally, but player enters weird state trying to stream again * calling superclass invalidate from engines for good measure * Fix UI to fix seemingly weird state * Fix error warning	2020-03-06 23:52:22 -08:00
tanhakabir	ebc282d5c2	fix crash on cancel streaming pressed (#30 )	2020-03-06 23:28:30 -08:00
Tanha	80ce253f92	Release 2.8.2	2020-01-21 00:29:28 -08:00
tanhakabir	fe2395066f	Add equalizer example (#28 ) * project configure for me * to see log * set project * new UI * fix ui * re-fix UI * add example of equalizer * Revert "re-fix UI" This reverts commit `05ed993a52`. * Revert "fix ui" This reverts commit `0da9f6adea`. * Revert "new UI" This reverts commit `ffd6a95a2d`. * Add verbose debug mode to player Co-authored-by: cendolinside123 <jnsbstn391@gmail.com>	2020-01-21 00:27:51 -08:00
Tanha	3e66b4b4d4	Release 2.8.1	2020-01-04 13:35:29 -08:00
Tanha	58bbc97a1b	Minor fix on end of audio notification	2020-01-04 13:35:03 -08:00
Tanha	8d9e9d92f4	Release 2.8.0	2020-01-04 13:24:47 -08:00
tanhakabir	03392c21e0	fix bug in notification of end of audio in PlayingStatus (#25 )	2020-01-04 13:23:50 -08:00
Tanha	924170d159	Release 2.7.0	2020-01-04 02:04:35 -08:00
tanhakabir	b355eb4e09	add api for buffer progress in SAAvailabilityRange (#24 )	2020-01-04 02:02:56 -08:00
Tanha	1373a816a6	Release 2.6.0	2019-12-18 21:23:07 -08:00
tanhakabir	196b04a703	Rename and deprecate initialize functions (#23 )	2019-12-18 21:22:28 -08:00
Tanha	ac971e65a6	Release 2.5.2	2019-12-18 16:19:57 -08:00
Tanha	2c50502b28	update documentation for live streaming audio	2019-12-18 16:19:37 -08:00
Tanha	c222b5a745	Release 2.5.1	2019-12-18 00:27:49 -08:00
Tanha	2e86a6503c	Clean up debug logging	2019-12-18 00:27:21 -08:00
Tanha	9ebd7fa7fe	Release 2.5.0	2019-12-18 00:24:11 -08:00
tanhakabir	5197a16023	Fix live streams/servers with unpredictable size at beginning of stream being playable (#21 ) * Handle case when header for stream does not contain expected content * update documentation * fix elapsed time updating on seek in example app	2019-12-18 00:22:31 -08:00
Tanha	159627c63e	Release 2.4.0	2019-12-03 01:43:45 -08:00
tanhakabir	07230cce1a	add another status to PlayingStatus for end of audio (#19 )	2019-12-03 01:42:56 -08:00
tanhakabir	a33aee80d1	Expose engine outside of SAPlayer (#18 ) * expose engine outside of player * add player clearing functionality	2019-12-03 01:25:58 -08:00
tanhakabir	e1d3da1ddb	Update README.md	2019-12-01 11:10:12 -08:00
Tanha	8c2524d990	Release 2.3.0	2019-12-01 01:17:54 -08:00
Tanha	be1b7aa05f	fix bug on bad network and streaming being stuck in missing data state close #4	2019-12-01 01:16:03 -08:00
Tanha	4b57fee75c	Release 2.2.0	2019-11-29 17:18:33 -08:00
tanhakabir	fc9c43a23c	Update accessing bytes of Data for Swift 5 (#17 )	2019-11-29 17:16:53 -08:00
Tanha	fd4e4e3b77	Release 2.1.0	2019-11-28 21:37:16 -08:00
tanhakabir	f1200252be	Update to Swift 5 (#16 )	2019-11-28 21:36:30 -08:00
Jonathan Mercer	046e64b2b8	Update README.md (#15 ) * Update readme - Completely re-worded the first paragraph - Re-worded some sentences that confused me - Moved audio manipulation in the end. Assuming that advanced users will read it there while keeping it hidden from other users * Update README.md	2019-11-27 16:36:24 -08:00
Tanha	ad9e40ad1c	Update README.md	2019-11-26 01:37:53 -08:00
Tanha	f19eaf7ec9	Release 2.0.1	2019-11-26 01:04:51 -08:00
tanhakabir	012291c1c9	Merge pull request #14 from tanhakabir/open_nodes_interface Open interface to control audio manipulation nodes	2019-11-26 01:03:11 -08:00