ios - 枚举 AudioBuffer 的样本？

Question

我有一个 AudioBuffer来自 AVCaptureSession CMSampleBuffer ， 像:

Sample Rate:              44100 
Format ID:                 lpcm 
Format Flags:                 C 
Bytes per Packet:             2 
Frames per Packet:            1 
Bytes per Frame:              2 
Channels per Frame:           1 
Bits per Channel:            16 

kAudioFormatFlagIsSignedInteger 
kAudioFormatFlagIsPacked 
kLinearPCMFormatFlagIsSignedInteger 
kLinearPCMFormatFlagIsPacked 
kLinearPCMFormatFlagsSampleFractionShift 
kAppleLosslessFormatFlag_32BitSourceData 

如何正确转换/枚举样本？ (做一些处理)
我应该转换成什么类型​​ mData有了上面的配置？

我是否完全正确地解析了格式标志？上面的输出是由 https://gist.github.com/eppz/11272305 制作的

Answer 1

一旦我解析了上面的标志，kAudioFormatFlagIsSignedInteger似乎是答案，每个 channel 有 16 位。

到目前为止，它是这样的:

// Enumerate audio buffers (probably faceing a sole buffer handling mono PCM anyway).
for (int audioBufferIndex = 0; audioBufferIndex <= audioBufferList.mNumberBuffers; audioBufferIndex++)
{
    AudioBuffer eachAudioBuffer = audioBufferList.mBuffers[audioBufferIndex];

    // Enumerate samples.
    SInt16 *samples;
    samples = (SInt16*)eachAudioBuffer.mData;
    for (int sampleIndex = 0; sampleIndex <= sampleCount; sampleIndex++)
    {
        SInt16 eachSample = samples[sampleIndex];
        printf("%i \n", eachSample);
    }
}