存储ExtAudioFile API中的AudioBufferLists供以后使用

ExtAudioFileRef audioFile;
AudioBufferList *bufferList;

// 打开音频文件
ExtAudioFileOpenURL((CFURLRef)fileURL, &audioFile);

// 获取音频文件的数据格式
AudioStreamBasicDescription audioDescription;
UInt32 size = sizeof(audioDescription);
ExtAudioFileGetProperty(audioFile, kExtAudioFileProperty_FileDataFormat, &size, &audioDescription);

// 创建AudioBufferList
bufferList = (AudioBufferList *)malloc(sizeof(AudioBufferList) + sizeof(AudioBuffer) * (audioDescription.mChannelsPerFrame - 1));
bufferList->mNumberBuffers = audioDescription.mChannelsPerFrame;

// 读取音频数据并存储在AudioBufferLists中
UInt32 frameCount = bufferList->mBuffers[0].mDataByteSize / audioDescription.mBytesPerFrame;
ExtAudioFileRead(audioFile, (UInt32 *)&frameCount, bufferList);

// 使用AudioBufferLists进行后续处理