int mpeg_iquant( short *, short *, short *, int , int );
int mpeg_idct( short *);
int mpeg_fetch_ref_tile( int, int, short, short,
			 int, int, PIC,
			 int, int, PIC, MacroBlock * );
int mpeg_recon( short *, int);
int mpeg_save_mb_tile( short *, PIC , int , int , int , int , int );
int mpeg_save_mb( short *, PIC , int , int , int , int , int );
int mpeg_save_pic( int , PIC , int );