オーディオストリームを再生するために、MatGallagerのオーディオストリーマーを使用しています。プログラムの別の時点(別のコントローラー)で、デバイスのマイクから何かを録音しようとしています。
これが私の設定です:
void SFIdentificator::startRecord()
{int i、bufferByteSize; UInt32サイズ;
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 occurred\n");;
}
}
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);
}
最初にAudioStreamerクラスを使用し、後で何かを録音しようとすると、コールバックさえ呼び出されないようです。しかし、最初にAudioStreamerを使用しなければ、すべて問題ありません。
誰かが私を正しい方向に向けることができますか?