iphone - AudioQueueStart报告不支持的格式

我正在尝试使音频队列在iPhone应用程序上正常工作，并且每当调用AudioQueueStart时，它都会给出“fmt？”。结果代码(kAudioFormatUnsupportedDataFormatError)。在下面的代码中，我将格式设置为kAudioFormatLinearPCM，这肯定受支持。我究竟做错了什么？

data.mDataFormat.mSampleRate = 44100;
data.mDataFormat.mFormatID = kAudioFormatLinearPCM;
data.mDataFormat.mFormatFlags = 0;
data.mDataFormat.mBytesPerPacket = 4;
data.mDataFormat.mFramesPerPacket = 1;
data.mDataFormat.mBytesPerFrame = 4;
data.mDataFormat.mChannelsPerFrame = 2;
data.mDataFormat.mBitsPerChannel = 16;

OSStatus status;

status = AudioQueueNewOutput(&data.mDataFormat, audioCallback, &data, CFRunLoopGetCurrent (), kCFRunLoopCommonModes, 0, &data.mQueue);

for (int i = 0; i < NUMBUFFERS; ++i)
{
    status = AudioQueueAllocateBuffer (data.mQueue, BUFFERSIZE, &data.mBuffers[i] );
    audioCallback (&data, data.mQueue, data.mBuffers[i]);
}

Float32 gain = 1.0;
status = AudioQueueSetParameter (data.mQueue, kAudioQueueParam_Volume, gain);

status = AudioQueueStart(data.mQueue, NULL);

数据的类型为audioData，如下所示:

typedef struct _audioData {
AudioQueueRef mQueue;
AudioQueueBufferRef mBuffers[NUMBUFFERS];
AudioStreamBasicDescription mDataFormat;

} audioData;

谢谢

最佳答案

错误的原因实际上是AudioQueueNewOutput，而不是AudioQueueStart。。请参见此相关问题audio streaming services failing to recognize file type