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Code Issues Releases Activity

trellis quantization for h263(p)

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Originally committed as revision 3503 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2004-09-24 20:35:59 +00:00
parent d7d51926dd
commit 15c5fa7b7f
1 changed files with 57 additions and 0 deletions
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57
libavcodec/h263.c
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@ -91,6 +91,8 @@ static uint32_t uni_mpeg4_intra_rl_bits[64*64*2*2];
static uint8_t uni_mpeg4_intra_rl_len [64*64*2*2];
static uint32_t uni_mpeg4_inter_rl_bits[64*64*2*2];
static uint8_t uni_mpeg4_inter_rl_len [64*64*2*2];
static uint8_t uni_h263_intra_aic_rl_len [64*64*2*2];
static uint8_t uni_h263_inter_rl_len [64*64*2*2];
//#define UNI_MPEG4_ENC_INDEX(last,run,level) ((last)*128 + (run)*256 + (level))
//#define UNI_MPEG4_ENC_INDEX(last,run,level) ((last)*128*64 + (run) + (level)*64)
#define UNI_MPEG4_ENC_INDEX(last,run,level) ((last)*128*64 + (run)*128 + (level))
@ -1876,6 +1878,50 @@ static void init_uni_mpeg4_rl_tab(RLTable *rl, uint32_t *bits_tab, uint8_t *len_
}
}
static void init_uni_h263_rl_tab(RLTable *rl, uint32_t *bits_tab, uint8_t *len_tab){
int slevel, run, last;
assert(MAX_LEVEL >= 64);
assert(MAX_RUN >= 63);
for(slevel=-64; slevel<64; slevel++){
if(slevel==0) continue;
for(run=0; run<64; run++){
for(last=0; last<=1; last++){
const int index= UNI_MPEG4_ENC_INDEX(last, run, slevel+64);
int level= slevel < 0 ? -slevel : slevel;
int sign= slevel < 0 ? 1 : 0;
int bits, len, code;
int level1, run1;
len_tab[index]= 100;
/* ESC0 */
code= get_rl_index(rl, last, run, level);
bits= rl->table_vlc[code][0];
len= rl->table_vlc[code][1];
bits=bits*2+sign; len++;
if(code!=rl->n && len < len_tab[index]){
if(bits_tab) bits_tab[index]= bits;
len_tab [index]= len;
}
/* ESC */
bits= rl->table_vlc[rl->n][0];
len = rl->table_vlc[rl->n][1];
bits=bits*2+last; len++;
bits=bits*64+run; len+=6;
bits=bits*256+(level&0xff); len+=8;
if(len < len_tab[index]){
if(bits_tab) bits_tab[index]= bits;
len_tab [index]= len;
}
}
}
}
}
void h263_encode_init(MpegEncContext *s)
{
static int done = 0;
@ -1892,10 +1938,21 @@ void h263_encode_init(MpegEncContext *s)
init_uni_mpeg4_rl_tab(&rl_intra, uni_mpeg4_intra_rl_bits, uni_mpeg4_intra_rl_len);
init_uni_mpeg4_rl_tab(&rl_inter, uni_mpeg4_inter_rl_bits, uni_mpeg4_inter_rl_len);
init_uni_h263_rl_tab(&rl_intra_aic, NULL, uni_h263_intra_aic_rl_len);
init_uni_h263_rl_tab(&rl_inter , NULL, uni_h263_inter_rl_len);
init_mv_penalty_and_fcode(s);
}
s->me.mv_penalty= mv_penalty; //FIXME exact table for msmpeg4 & h263p
s->intra_ac_vlc_length =s->inter_ac_vlc_length = uni_h263_inter_rl_len;
s->intra_ac_vlc_last_length=s->inter_ac_vlc_last_length= uni_h263_inter_rl_len + 128*64;
if(s->h263_aic){
s->intra_ac_vlc_length = uni_h263_intra_aic_rl_len;
s->intra_ac_vlc_last_length= uni_h263_intra_aic_rl_len + 128*64;
}
s->ac_esc_length= 7+1+6+8;
// use fcodes >1 only for mpeg4 & h263 & h263p FIXME
switch(s->codec_id){
case CODEC_ID_MPEG4: