Can someone help translate these snippets of code

CMSampleBufferRef sampleBuffer = [assetOutput  copyNextSampleBuffer];

CMBlockBufferRef blockBuffer;
AudioBufferList audioBufferList;

 CMSampleBufferGetAudioBufferListWithRetainedBlockBuffer(sampleBuffer, NULL, &audioBufferList, sizeof(AudioBufferList), NULL, NULL, kCMSampleBufferFlag_AudioBufferList_Assure16ByteAlignment, &blockBuffer);

for (NSUInteger i = 0; i < audioBufferList.mNumberBuffers; i++) {
  AudioBuffer audioBuffer = audioBufferList.mBuffers[i];
  [audioStream writeData:audioBuffer.mData     maxLength:audioBuffer.mDataByteSize];
}

CFRelease(blockBuffer);
CFRelease(sampleBuffer);

// Start receiving data
    inputStream.delegate = self;
    [inputStream scheduleInRunLoop:[NSRunLoop     currentRunLoop]    forMode:NSDefaultRunLoopMode];
    [inputStream open];

@interface MyCustomClass () <NSStreamDelegate>
//...
@end

@implementation MyCustomClass
//...

- (void)stream:(NSStream *)aStream handleEvent:    (NSStreamEvent)eventCode
 {
    if (eventCode == NSStreamEventHasBytesAvailable) {
        // handle incoming data
    } else if (eventCode == NSStreamEventEndEncountered)     {
        // notify application that stream has ended
    } else if (eventCode == NSStreamEventErrorOccurred)     {
        // notify application that stream has encountered and     error
    }
}

//...
@end

AudioFileStreamID audioFileStreamID;
AudioFileStreamOpen((__bridge void *)self,         AudioFileStreamPropertyListener,       AudioFileStreamPacketsListener, 0, &audioFileStreamID);

void AudioFileStreamPropertyListener(void *inClientData,     AudioFileStreamID inAudioFileStreamID,     AudioFileStreamPropertyID inPropertyID, UInt32 *ioFlags)
{
    MyCustomClass *myClass = (__bridge MyCustomClass  *)inClientData;
     [myClass didChangeProperty:inPropertyID flags:ioFlags];
 }

void AudioFileStreamPacketsListener(void *inClientData,     UInt32 inNumberBytes, UInt32 inNumberPackets, const void     *inInputData, AudioStreamPacketDescription     *inPacketDescriptions)
{
    MyCustomClass *myClass = (__bridge MyCustomClass     *)inClientData;
    [myClass didReceivePackets:inInputData     packetDescriptions:inPacketDescriptions     numberOfPackets:inNumberPackets     numberOfBytes:inNumberBytes];
}

AudioStreamBasicDescription basicDescription;
UInt32 basicDescriptionSize = sizeof(basicDescription);
AudioFileStreamGetProperty(audioFileStreamID, kAudioFileStreamProperty_DataFormat,     &basicDescriptionSize, &basicDescription);

uint8_t bytes[512];
UInt32 length = [audioStream readData:bytes maxLength:512];
AudioFileStreamParseBytes(audioFileStreamID, length, data, 0);

AudioQueueRef audioQueue;
AudioQueueNewOutput(&basicDescription, AudioQueueOutputCallback, (__bridge void *)self, NULL,     NULL, 0, &audioQueue);

AudioQueueBufferRef audioQueueBuffer;
AudioQueueAllocateBuffer(audioQueue, 2048, &audioQueueBuffer);

 AudioQueueBufferRef audioQueueBuffer = [self aFreeBuffer];
 memcpy((char *)audioQueueBuffer->mAudioData, (const char *)data, length);

AudioQueueBufferRef audioQueueBuffer = [self aFreeBuffer];
memcpy((char *)audioQueueBuffer->mAudioData, (const char *)(data +     packetDescription.mStartOffset), packetDescription.mDataByteSize);

AudioQueueEnqueueBuffer(audioQueue, audioQueueBuffer, numberOfPacketDescriptions,      packetDescriptions);

AudioQueuePrime(audioQueue, 0, NULL);
AudioQueueStart(audioQueue, NULL);