播放流后，音频队列无法录制音频
我正在使用Mat Gallager的音频流媒体播放音频流。 在程序的另一个地方（一个不同的控制器），我试图从设备的麦克风中记录一些内容。
这是我的设置：
void SFIdentificator::startRecord()
{int i，bufferByteSize; UInt32大小;
try {
numberOfPackets = 0;
// specify the recording format
SetupAudioFormat(kAudioFormatLinearPCM);
AudioQueueNewInput( &mRecordFormat,
MyInputBufferHandler,
this /* userData */,
CFRunLoopGetMain() /* run loop */, kCFRunLoopCommonModes /* run loop mode */,
0 /* flags */, &mQueue);
mRecordPacket = 0;
size = sizeof(mRecordFormat);
AudioQueueGetProperty(mQueue, kAudioQueueProperty_StreamDescription, &mRecordFormat, &size);
bufferByteSize = ComputeRecordBufferSize(&mRecordFormat, kBufferDurationSeconds); // enough bytes for half a second
size = sizeof(mRecordFormat);
XThrowIfError(AudioQueueGetProperty(mQueue, kAudioQueueProperty_StreamDescription,
&mRecordFormat, &size), "couldn't get queue's format");
for (i = 0; i < kNumberRecordBuffers; ++i) {
XThrowIfError(AudioQueueAllocateBuffer(mQueue, bufferByteSize, &mBuffers[i]), "AudioQueueAllocateBuffer failed");
XThrowIfError(AudioQueueEnqueueBuffer(mQueue, mBuffers[i], 0, NULL), "AudioQueueEnqueueBuffer failed");
}
mIsRunning = true;
XThrowIfError(AudioQueueStart(mQueue, NULL), "AudioQueueStart failed");
} catch (CAXException e) {
char buf[256];
fprintf(stderr, "Error: %s (%s)n", e.mOperation, e.FormatError(buf));
}catch (...) {
fprintf(stderr, "An unknown error occurredn");;
}
}
void SFIdentificator::SetupAudioFormat(UInt32 inFormatID)
{memset（＆mRecordFormat，0，sizeof（mRecordFormat））;
UInt32 size = sizeof(mRecordFormat.mSampleRate);
XThrowIfError(AudioSessionGetProperty( kAudioSessionProperty_CurrentHardwareSampleRate, &size, &mRecordFormat.mSampleRate), "couldn't get hardware sample rate");
size = sizeof(mRecordFormat.mChannelsPerFrame);
XThrowIfError(AudioSessionGetProperty( kAudioSessionProperty_CurrentHardwareInputNumberChannels, &size, &mRecordFormat.mChannelsPerFrame), "couldn't get input channel count");
mRecordFormat.mFormatID = inFormatID;
if (inFormatID == kAudioFormatLinearPCM){
// if we want pcm, default to signed 16-bit little-endian
mRecordFormat.mFormatFlags = kLinearPCMFormatFlagIsSignedInteger | kLinearPCMFormatFlagIsPacked;
// mRecordFormat.mBitsPerChannel = 16;
mRecordFormat.mBytesPerPacket = mRecordFormat.mBytesPerFrame = (mRecordFormat.mBitsPerChannel / 8) * mRecordFormat.mChannelsPerFrame;
mRecordFormat.mFramesPerPacket = 1;
mRecordFormat.mFormatID = kAudioFormatLinearPCM;
mRecordFormat.mSampleRate = 32000.0;
mRecordFormat.mChannelsPerFrame = 1;
mRecordFormat.mBitsPerChannel = 16;
mRecordFormat.mBytesPerPacket = mRecordFormat.mBytesPerFrame = mRecordFormat.mChannelsPerFrame * sizeof (SInt16);
mRecordFormat.mFramesPerPacket = 1;
}
}
UInt32 SFIdentificator::ComputeRecordBufferSize(const AudioStreamBasicDescription *format, float seconds){
static const int maxBufferSize = 0x50000;
int maxPacketSize = format->mBytesPerPacket;
if (maxPacketSize == 0) {
UInt32 maxVBRPacketSize = sizeof(maxPacketSize);
AudioQueueGetProperty (mQueue, kAudioQueueProperty_MaximumOutputPacketSize, &maxPacketSize, &maxVBRPacketSize);
}
Float64 numBytesForTime = DataFormat().mSampleRate * maxPacketSize * seconds;
// *outBufferSize = (UInt32)(numBytesForTime < maxBufferSize ? numBytesForTime : maxBufferSize);
return (UInt32)(numBytesForTime < maxBufferSize ? numBytesForTime : maxBufferSize);
}
似乎如果我先使用AudioStreamer类并尝试稍后记录某些内容，则甚至不会调用Callback。 但是如果我不先使用AudioStreamer，一切都很好。
任何人都可以将我指向正确的方向吗？
回答我自己的问题，正确设置AudioSession对象的init（）是一个问题。 它应该只在每个会话中完成一次，并且再次执行会导致错误，我已经识别出无法记录流。 但是，即使第二个init失败了，我也可以记录流（当然，第一个成功了）。
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