question: public long create_sample_to_chunk_atom ( MP4DataStream bitstream ) throws IOException { create_full_atom ( bitstream ) ; records = new Vector < Record > ( ) ; entryCount = ( int ) bitstream . readBytes ( 4 ) ; readed += 4 ; for ( int i = 0 ; i < entryCount ; i ++ ) { int firstChunk = ( int ) bitstream . readBytes ( 4 ) ; int samplesPerChunk = ( int ) bitstream . readBytes ( 4 ) ; int sampleDescriptionIndex = ( int ) bitstream . readBytes ( 4 ) ; records . addElement ( new Record ( firstChunk , samplesPerChunk , sampleDescriptionIndex ) ) ; readed += 12 ; } return readed ; }
target:  Loads MP4SampleToChunkAtom atom from the input bitstream.