iphone - AudioQueueStart 报告不支持的格式

Question

我试图让音频队列在 iPhone 应用程序上工作，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，这肯定是受支持的。我做错了什么？

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;

} 音频数据；

谢谢

Answer 1

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