c++ - 提取 quicktime 文件中的每个音频 channel

Question

我想使用 QuickTime-API 提取 quicktime 电影中的每个音频 channel 。这意味着如果文件有 5.1 环绕声，我最后想要 6 个音频文件。但目前我不知道如何管理它。到目前为止，我有:

OSStatus err = noErr;
MovieAudioExtractionRef extractionSessionRef = nil;
Boolean allChannelsDiscrete = true;
int flags;
int numFrames;
AudioBufferList *mBufferList;
err = MovieAudioExtractionBegin(movie, 0, &extractionSessionRef); 


// disable mixing of audio channels
err = MovieAudioExtractionSetProperty(extractionSessionRef,
  kQTPropertyClass_MovieAudioExtraction_Movie,
  kQTMovieAudioExtractionMoviePropertyID_AllChannelsDiscrete,
  sizeof (Boolean), &allChannelsDiscrete);

err = MovieAudioExtractionFillBuffer(extractionSessionRef, &numFrames, 
  mBufferList, &flags);
if (flags & kQTMovieAudioExtractionComplete)
{
    // extraction complete!
}
err = MovieAudioExtractionEnd(extractionSessionRef);

问题是我不知道如何获取 mBufferList 以及如何将每个 channel 导出为 WAV 48kHz。你能帮助我吗？例子来自this page .

Answer 1

你检查过this了吗？ ？