MP3 Bit reservoir: dist10 source code

[pablogog]

Greetings.. I'm studying the source code from dist10 ( In C languaje) and I can't understand how the bit reservoir is working...

             if ( flush_main=(hsstell() % bitsPerSlot) ) {
                hgetbits((int)(bitsPerSlot - flush_main));
        main_data_end ++;
         }


             bytes_to_discard = frame_start - main_data_end
                        - III_side_info.main_data_begin;



             if( main_data_end > 4096 )
             {   frame_start -= 4096;
                 rewindNbytes( 4096 );
             }// ???

             frame_start += main_data_slots(fr_ps);
             {//Notes
                    /*ES: Se suma la cantidad de bytes que comprende el main data
                    al frame_start*/
             }


             if (bytes_to_discard < 0) {
         printf("Not enough main data to decode frame %d.  Frame discarded.\n",
                        frameNum - 1); break;
             }



             for (; bytes_to_discard > 0; bytes_to_discard--) hgetbits(8);

Perhaps somebody understood this??? The disto10 source code can be founded here: http://mp3-tech.org/programmer/sources/dist10.tgz



Many thanks for any answer