void mpeg1_encode_init(MpegEncContext *s) { static int done=0; if(!done){ int f_code; int mv; done=1; for(f_code=1; f_code<=MAX_FCODE; f_code++){ for(mv=-MAX_MV; mv<=MAX_MV; mv++){ int len; if(mv==0) len= mbMotionVectorTable[0][1]; else{ int val, bit_size, range, code; bit_size = s->f_code - 1; range = 1 << bit_size; val=mv; if (val < 0) val = -val; val--; code = (val >> bit_size) + 1; if(code<17){ len= mbMotionVectorTable[code][1] + 1 + bit_size; }else{ len= mbMotionVectorTable[16][1] + 2 + bit_size; } } mv_penalty[f_code][mv+MAX_MV]= len; } } for(f_code=MAX_FCODE; f_code>0; f_code--){ for(mv=-(8<<f_code); mv<(8<<f_code); mv++){ fcode_tab[mv+MAX_MV]= f_code; } } } s->mv_penalty= mv_penalty; s->fcode_tab= fcode_tab; }