CMSampleBufferRef TO NSData
CMBlockBufferRef blockBufferRef = CMSampleBufferGetDataBuffer(sampleBuffer);
size_t length = CMBlockBufferGetDataLength(blockBufferRef);
Byte buffer[length];
CMBlockBufferCopyDataBytes(blockBufferRef, 0, length, buffer);
NSData *data = [NSData dataWithBytes:buffer length:length];
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