Swift3 AudioToolbox：PCM播放如何AudioQueueAllocateBuffer？

我正在关注https://github.com/AlesTsurko/LearningCoreAudioWithSwift2.0/tree/master/CH05_Player 以播放频率，但它是用Swift2。 Get microphone input using Audio Queue in Swift 3已解决了许多问题，但它是用于录音的。Swift3 AudioToolbox：PCM播放如何AudioQueueAllocateBuffer？

我被困在一个缓冲区分配给音响队列

var ringBuffers = [AudioQueueBufferRef](repeating:nil, count:3) 
AudioQueueAllocateBuffer(inQueue!, bufferSize, &ringBuffers[0])

它给出了一个错误

main.swift:152:29: Expression type '[AudioQueueBufferRef]' is ambiguous without more context 
main.swift:153:20: Cannot pass immutable value as inout argument: implicit conversion from 'AudioQueueBufferRef' to 'AudioQueueBufferRef?' requires a temporary

--AFTER SPAD的answer--

var ringBuffers = [AudioQueueBufferRef?](repeating:nil, count:3) 
let status = AudioQueueAllocateBuffer(inQueue!, bufferSize, &ringBuffers[0]) 
print("\(status.description)")

打印

vm_map failed: 0x4 ((os/kern) invalid argument) 
4

我用音频描述为

inFormat = AudioStreamBasicDescription(
      mSampleRate:  Double(sampleRate), 
      mFormatID:   kAudioFormatLinearPCM, 
      mFormatFlags:  kLinearPCMFormatFlagIsBigEndian | kLinearPCMFormatFlagIsSignedInteger | kLinearPCMFormatFlagIsPacked, 
      mBytesPerPacket: UInt32(numChannels * MemoryLayout<UInt16>.size), 
      mFramesPerPacket: 1, 
      mBytesPerFrame:  UInt32(numChannels * MemoryLayout<UInt16>.size), 
      mChannelsPerFrame: UInt32(numChannels), 
      mBitsPerChannel: UInt32(8 * (MemoryLayout<UInt16>.size)), 
      mReserved:   UInt32(0) 
     ) 
AudioQueueNewOutput(&inFormat, AQOutputCallback, &player, nil, nil, 0, &inQueue)

来源

2017-05-14 neckTwi

如果您没有AudioQueueBufferRef的数组？而不是AudioQueueBufferRef

var ringBuffers = [AudioQueueBufferRef?](repeating:nil, count:3) 
AudioQueueAllocateBuffer(inQueue!, bufferSize, &ringBuffers[0])

来源

2017-05-19 07:57:29 Spads

似乎多数民众赞成...我会回来完成代码 – neckTwi

但是那给'vm_map失败：为0x4（（OS /克恩）无效参数）'运行时错误与'AudioQueueAllocateBuffer' – neckTwi

鉴于更新到你的问题我不能让它与AudioQueueBufferRef编译！。它必须是一个AudioQueueBufferRef？ – Spads

Swift3 AudioToolbox：PCM播放如何AudioQueueAllocateBuffer？

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