void ff_mpeg1_encode_init(MpegEncContext *s) { static int done=0; common_init(s); if(!done){ int f_code; int mv; int i; done=1; init_rl(&rl_mpeg1); for(i=0; i<64; i++) { mpeg1_max_level[0][i]= rl_mpeg1.max_level[0][i]; mpeg1_index_run[0][i]= rl_mpeg1.index_run[0][i]; } init_uni_ac_vlc(&rl_mpeg1, uni_mpeg1_ac_vlc_bits, uni_mpeg1_ac_vlc_len); /* build unified dc encoding tables */ for(i=-255; i<256; i++) { int adiff, index; int bits, code; int diff=i; adiff = ABS(diff); if(diff<0) diff--; index = av_log2(2*adiff); bits= vlc_dc_lum_bits[index] + index; code= (vlc_dc_lum_code[index]<<index) + (diff & ((1 << index) - 1)); mpeg1_lum_dc_uni[i+255]= bits + (code<<8); bits= vlc_dc_chroma_bits[index] + index; code= (vlc_dc_chroma_code[index]<<index) + (diff & ((1 << index) - 1)); mpeg1_chr_dc_uni[i+255]= bits + (code<<8); } mv_penalty= av_mallocz( sizeof(uint8_t)*(MAX_FCODE+1)*(2*MAX_MV+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 = 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->me.mv_penalty= mv_penalty; s->fcode_tab= fcode_tab; if(s->codec_id == CODEC_ID_MPEG1VIDEO){ s->min_qcoeff=-255; s->max_qcoeff= 255; }else{ s->min_qcoeff=-2047; s->max_qcoeff= 2047; } s->intra_ac_vlc_length= s->inter_ac_vlc_length= s->intra_ac_vlc_last_length= s->inter_ac_vlc_last_length= uni_mpeg1_ac_vlc_len; }