Getting separate buffers of float data from CoreAudio

gistfile1.txt

    // Setup the output asbd
    _outputFormat.mFormatID = kAudioFormatLinearPCM;
    _outputFormat.mFormatFlags = kAudioFormatFlagsAudioUnitCanonical; // kAudioFormatFlagIsFloat | kAudioFormatFlagsNativeEndian | kAudioFormatFlagIsPacked | kAudioFormatFlagIsNonInterleaved
    _outputFormat.mSampleRate = inFormat.mSampleRate;
    _outputFormat.mChannelsPerFrame = inFormat.mChannelsPerFrame;
    _outputFormat.mFramesPerPacket = 1;
    _outputFormat.mBytesPerFrame = 4;
    _outputFormat.mBytesPerPacket = 4;
    _outputFormat.mBitsPerChannel = 32;

    // Create enough AudioBuffers for our data.
    // AudioBufferList only defines 1 buffer in it so we have to allocate the other ones.
    AudioBufferList *bufferList = (AudioBufferList*)malloc(sizeof(AudioBufferList) + (sizeof(AudioBuffer) * (_outputFormat.mChannelsPerFrame - 1)));
    bufferList->mNumberBuffers = _outputFormat.mChannelsPerFrame;
    for ( int i=0; i < bufferList->mNumberBuffers; i++ ) {
        bufferList->mBuffers[i].mNumberChannels = 1;
        bufferList->mBuffers[i].mDataByteSize = BUFFER_SIZE * sizeof(float);
        bufferList->mBuffers[i].mData = malloc(BUFFER_SIZE * sizeof(float));
    }

    while (1) {
        OSStatus status;
        UInt32 frameCount = BUFFER_SIZE / sizeof(float);
        
        status = ExtAudioFileRead(_fileRef, &frameCount, bufferList);
        if (check_status_is_error(status, "ExtAudioFileRead")) {
            _error = make_error(status, "ExtAudioFileRead");
            break;
        }
        
        if (frameCount == 0) {
            break;
        }
        
        for (i = 0; i < _outputFormat.mChannelsPerFrame; i++) {
            // Do something with the data in bufferList->mBuffers[i].mData
        }
    }