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Code Issues Releases Activity

avcodec/h261: trellis quantization support

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Fixes ticket3143

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2013-11-17 15:05:51 +01:00
parent be1e6e7503
commit 331a90cec4
2 changed files with 55 additions and 5 deletions
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50
libavcodec/h261enc.c
View File

@ -32,6 +32,9 @@
#include "h263.h"
#include "h261.h"
static uint8_t uni_h261_rl_len [64*64*2*2];
#define UNI_ENC_INDEX(last,run,level) ((last)*128*64 + (run)*128 + (level))
int ff_h261_get_picture_format(int width, int height)
{
// QCIF
@ -313,6 +316,47 @@ void ff_h261_encode_mb(MpegEncContext *s, int16_t block[6][64],
}
}
static av_cold void init_uni_h261_rl_tab(RLTable *rl, uint32_t *bits_tab,
uint8_t *len_tab)
{
int slevel, run, last;
av_assert0(MAX_LEVEL >= 64);
av_assert0(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_ENC_INDEX(last, run, slevel+64);
int level= slevel < 0 ? -slevel : slevel;
int sign= slevel < 0 ? 1 : 0;
int bits, len, code;
len_tab[index]= 100;
/* ESC0 */
code= get_rl_index(rl, 0, run, level);
len= rl->table_vlc[code][1] + 1;
if(last)
len += 2;
if(code!=rl->n && len < len_tab[index]){
len_tab [index]= len;
}
/* ESC */
len = rl->table_vlc[rl->n][1];
if(last)
len += 2;
if(len < len_tab[index]){
len_tab [index]= len;
}
}
}
}
}
av_cold void ff_h261_encode_init(MpegEncContext *s)
{
ff_h261_common_init();
@ -321,6 +365,12 @@ av_cold void ff_h261_encode_init(MpegEncContext *s)
s->max_qcoeff = 127;
s->y_dc_scale_table =
s->c_dc_scale_table = ff_mpeg1_dc_scale_table;
s->ac_esc_length = 6+6+8;
init_uni_h261_rl_tab(&ff_h261_rl_tcoeff, NULL, uni_h261_rl_len);
s->intra_ac_vlc_length = s->inter_ac_vlc_length = uni_h261_rl_len;
s->intra_ac_vlc_last_length = s->inter_ac_vlc_last_length = uni_h261_rl_len + 128*64;
}
FF_MPV_GENERIC_CLASS(h261)

10
libavcodec/mpegvideo_enc.c
View File

@ -3602,7 +3602,7 @@ static int dct_quantize_trellis_c(MpegEncContext *s,
av_assert2(level);
if(s->out_format == FMT_H263){
if(s->out_format == FMT_H263 || s->out_format == FMT_H261){
unquant_coeff= alevel*qmul + qadd;
}else{ //MPEG1
j= s->dsp.idct_permutation[ scantable[i] ]; //FIXME optimize
@ -3631,7 +3631,7 @@ static int dct_quantize_trellis_c(MpegEncContext *s,
}
}
if(s->out_format == FMT_H263){
if(s->out_format == FMT_H263 || s->out_format == FMT_H261){
for(j=survivor_count-1; j>=0; j--){
int run= i - survivor[j];
int score= distortion + last_length[UNI_AC_ENC_INDEX(run, level)]*lambda;
@ -3657,7 +3657,7 @@ static int dct_quantize_trellis_c(MpegEncContext *s,
}
}
if(s->out_format == FMT_H263){
if(s->out_format == FMT_H263 || s->out_format == FMT_H261){
for(j=survivor_count-1; j>=0; j--){
int run= i - survivor[j];
int score= distortion + score_tab[i-run];
@ -3690,7 +3690,7 @@ static int dct_quantize_trellis_c(MpegEncContext *s,
survivor[ survivor_count++ ]= i+1;
}
if(s->out_format != FMT_H263){
if(s->out_format != FMT_H263 && s->out_format != FMT_H261){
last_score= 256*256*256*120;
for(i= survivor[0]; i<=last_non_zero + 1; i++){
int score= score_tab[i];
@ -3723,7 +3723,7 @@ static int dct_quantize_trellis_c(MpegEncContext *s,
int alevel= FFABS(level);
int unquant_coeff, score, distortion;
if(s->out_format == FMT_H263){
if(s->out_format == FMT_H263 || s->out_format == FMT_H261){
unquant_coeff= (alevel*qmul + qadd)>>3;
}else{ //MPEG1
unquant_coeff = ((( alevel << 1) + 1) * qscale * ((int) s->inter_matrix[0])) >> 4;