音频队列无法启动

1. 使用创建新输出 AudioQueueNewOutput
2. 为添加属性侦听器 kAudioQueueProperty_IsRunning
3. 为我的缓冲区分配 AudioQueueAllocateBuffer
4. 呼叫 AudioQueuePrime
5. 呼叫 AudioQueueStart

问题是,当我打电话 音频队列素数 它在控制台上输出以下错误

AudioConverterNew returned -50
Prime failed (-50); will stop (11025/0 frames)

这里怎么了?

附言:

1. 我在iOS(设备和模拟器)上遇到此错误
2. 调用时安装的输出回调 音频队列新输出 从来没人叫过!
3. AudioStreamBasicDescription 与格式(AAC)不匹配
4. 我用Mat的 AudioStreamer

初始化代码示例:

// Get the stream description from the first sample buffer
OSStatus err = noErr;

EDSampleBuffer *firstBuf = [sampleBufs objectAtIndex:0];
AudioStreamBasicDescription asbd = firstBuf.streamDescription;

// TODO: remove temporary format setup, just to ensure format for now
asbd.mSampleRate = 44100.00;
asbd.mFramesPerPacket = 1024; // AAC default
asbd.mChannelsPerFrame = 2;

pfcc(asbd.mFormatID);
// -----------------------------------

// Create a new output
err = AudioQueueNewOutput(&asbd, _audioQueueOutputCallback, self, NULL, NULL, 0, &audioQueue);
if (err) {
    [self _reportError:kASAudioQueueInitializationError];
    goto bail;
}

// Add property listener for queue state
err = AudioQueueAddPropertyListener(audioQueue, kAudioQueueProperty_IsRunning, _audioQueueIsRunningCallback, self);
if (err) {
    [self _reportError:kASAudioQueuePropertyListenerError];
    goto bail;
}

// Allocate a queue buffers
for (int i=0; i<kAQNumBufs; i++) {
    err = AudioQueueAllocateBuffer(audioQueue, kAQDefaultBufSize, &queueBuffer[i]);
    if (err) {
        [self _reportError:kASAudioQueueBufferAllocationError];
        goto bail;
    }
}

// Prime and start
err = AudioQueuePrime(audioQueue, 0, NULL);
if (err) {
    printf("failed to prime audio queue %ld\n", err);
    goto bail;
}

err = AudioQueueStart(audioQueue, NULL);
if (err) {
    printf("failed to start audio queue %ld\n", err);
    goto bail;
}

这些是音频文件流中的格式标志

rate: 44100.000000
framesPerPacket: 1024
format: aac 
bitsPerChannel: 0
reserved: 0
channelsPerFrame: 2
bytesPerFrame: 0
bytesPerPacket: 0
formatFlags: 0
cookieSize 39