Tanha
57 lines
2.6 KiB
Swift
57 lines
2.6 KiB
Swift
//
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// AudioParsable.swift
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// SwiftAudioPlayer
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//
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// Created by Tanha Kabir on 2019-01-29.
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// Copyright © 2019 Tanha Kabir, Jon Mercer
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//
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// This file was modified and adapted from https://github.com/syedhali/AudioStreamer
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// which was released under Apache License 2.0. Apache License 2.0 requires explicit
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// documentation of modified files from source and a copy of the Apache License 2.0
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// in the project which is under the name Credited_LICENSE.
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//
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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// THE SOFTWARE.
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import Foundation
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import AVFoundation
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protocol AudioParsable { //For the layer above us
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var fileAudioFormat: AVAudioFormat? {get}
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var totalPredictedPacketCount: AVAudioPacketCount { get }
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func tellSeek(toIndex index: AVAudioPacketCount)
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func pollRangeOfSecondsAvailableFromNetwork() -> (Needle, Duration)
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func pullPacket(atIndex index: AVAudioPacketCount) throws -> (AudioStreamPacketDescription?, Data)
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func invalidate() //deinit caused concurrency problems
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}
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extension AudioParsable { //For the layer above us
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var predictedDuration: Duration? {
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guard let sampleRate = fileAudioFormat?.sampleRate else { return nil }
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guard let totalPredictedFrameCount = totalPredictedAudioFrameCount else { return nil }
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return Duration(totalPredictedFrameCount)/Duration(sampleRate)
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}
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var totalPredictedAudioFrameCount: AUAudioFrameCount? {
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guard let framesPerPacket = fileAudioFormat?.streamDescription.pointee.mFramesPerPacket else {return nil }
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return AVAudioFrameCount(totalPredictedPacketCount) * AVAudioFrameCount(framesPerPacket)
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}
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}
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