AudioBuffer sourceBuffer = audioBufferList->mBuffers[0];

// we check here if the input data byte size has changed
if (inAudioBuffer.mDataByteSize != sourceBuffer.mDataByteSize) {
    // clear old buffer
    free(inAudioBuffer.mData);
    // assing new byte size and allocate them on mData
    inAudioBuffer.mDataByteSize = sourceBuffer.mDataByteSize;
    inAudioBuffer.mData = malloc(sourceBuffer.mDataByteSize);
}
int currentBuffer =0;
int maxBuf = 800;

NSMutableData *data=[[NSMutableData alloc] init];
// CMBlockBufferRef blockBuffer;
// CMSampleBufferGetAudioBufferListWithRetainedBlockBuffer(ref, NULL, &audioBufferList, sizeof(audioBufferList), NULL, NULL, 0, &blockBuffer);
// NSLog(@"%@",blockBuffer);


// audioBufferList->mBuffers[0].mData, audioBufferList->mBuffers[0].mDataByteSize
for( int y=0; y<audioBufferList->mNumberBuffers; y++ )
{
    if (currentBuffer < maxBuf){
        AudioBuffer audioBuff = audioBufferList->mBuffers[y];
        Float32 *frame = (Float32*)audioBuff.mData;


        [data appendBytes:frame length:inAudioBuffer.mDataByteSize];
        currentBuffer += audioBuff.mDataByteSize;
    }
    else{
        break;
    }

}

// copy incoming audio data to the audio buffer (no need since we are not using playback)
//memcpy(inAudioBuffer.mData, audioBufferList->mBuffers[0].mData, audioBufferList->mBuffers[0].mDataByteSize);