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avoid UPDATE_CACHE() in GET_RL_VLC() if not needed

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Originally committed as revision 4137 to svn://svn.ffmpeg.org/ffmpeg/trunk
pull/126/head
Michael Niedermayer 20 years ago
parent 5bb8a0daa1
commit e91f4bf160
5 changed files with 18 additions and 16 deletions
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  1. 8
      libavcodec/bitstream.h
  2. 6
      libavcodec/h263.c
  3. 2
      libavcodec/mdec.c
  4. 12
      libavcodec/mpeg12.c
  5. 6
      libavcodec/msmpeg4.c

8
libavcodec/bitstream.h
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@ -727,7 +727,7 @@ void free_vlc(VLC *vlc);
SKIP_BITS(name, gb, n)\
}
#define GET_RL_VLC(level, run, name, gb, table, bits, max_depth)\
#define GET_RL_VLC(level, run, name, gb, table, bits, max_depth, need_update)\
{\
int n, index, nb_bits;\
\
@ -736,8 +736,10 @@ void free_vlc(VLC *vlc);
n = table[index].len;\
\
if(max_depth > 1 && n < 0){\
LAST_SKIP_BITS(name, gb, bits)\
UPDATE_CACHE(name, gb)\
SKIP_BITS(name, gb, bits)\
if(need_update){\
UPDATE_CACHE(name, gb)\
}\
\
nb_bits = -n;\
\

6
libavcodec/h263.c
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@ -4797,7 +4797,7 @@ static inline int mpeg4_decode_block(MpegEncContext * s, DCTELEM * block,
OPEN_READER(re, &s->gb);
for(;;) {
UPDATE_CACHE(re, &s->gb);
GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2);
GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 0);
if (level==0) {
/* escape */
if(rvlc){
@ -4908,7 +4908,7 @@ static inline int mpeg4_decode_block(MpegEncContext * s, DCTELEM * block,
#else
SKIP_BITS(re, &s->gb, 2);
#endif
GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2);
GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1);
i+= run + rl->max_run[run>>7][level/qmul] +1; //FIXME opt indexing
level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
LAST_SKIP_BITS(re, &s->gb, 1);
@ -4921,7 +4921,7 @@ static inline int mpeg4_decode_block(MpegEncContext * s, DCTELEM * block,
#else
SKIP_BITS(re, &s->gb, 1);
#endif
GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2);
GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1);
i+= run;
level = level + rl->max_level[run>>7][(run-1)&63] * qmul;//FIXME opt indexing
level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);

2
libavcodec/mdec.c
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@ -81,7 +81,7 @@ static inline int mdec_decode_block_intra(MDECContext *a, DCTELEM *block, int n)
/* now quantify & encode AC coefs */
for(;;) {
UPDATE_CACHE(re, &a->gb);
GET_RL_VLC(level, run, re, &a->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2);
GET_RL_VLC(level, run, re, &a->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
if(level == 127){
break;

12
libavcodec/mpeg12.c
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@ -1507,7 +1507,7 @@ static inline int mpeg1_decode_block_intra(MpegEncContext *s,
/* now quantify & encode AC coefs */
for(;;) {
UPDATE_CACHE(re, &s->gb);
GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2);
GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
if(level == 127){
break;
@ -1583,7 +1583,7 @@ static inline int mpeg1_decode_block_inter(MpegEncContext *s,
/* now quantify & encode AC coefs */
for(;;) {
UPDATE_CACHE(re, &s->gb);
GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2);
GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
if(level == 127){
break;
@ -1656,7 +1656,7 @@ static inline int mpeg1_fast_decode_block_inter(MpegEncContext *s, DCTELEM *bloc
/* now quantify & encode AC coefs */
for(;;) {
UPDATE_CACHE(re, &s->gb);
GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2);
GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
if(level == 127){
break;
@ -1737,7 +1737,7 @@ static inline int mpeg2_decode_block_non_intra(MpegEncContext *s,
/* now quantify & encode AC coefs */
for(;;) {
UPDATE_CACHE(re, &s->gb);
GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2);
GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
if(level == 127){
break;
@ -1805,7 +1805,7 @@ static inline int mpeg2_fast_decode_block_non_intra(MpegEncContext *s,
/* now quantify & encode AC coefs */
for(;;) {
UPDATE_CACHE(re, &s->gb);
GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2);
GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
if(level == 127){
break;
@ -1879,7 +1879,7 @@ static inline int mpeg2_decode_block_intra(MpegEncContext *s,
/* now quantify & encode AC coefs */
for(;;) {
UPDATE_CACHE(re, &s->gb);
GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2);
GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
if(level == 127){
break;

6
libavcodec/msmpeg4.c
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@ -1731,7 +1731,7 @@ static inline int msmpeg4_decode_block(MpegEncContext * s, DCTELEM * block,
OPEN_READER(re, &s->gb);
for(;;) {
UPDATE_CACHE(re, &s->gb);
GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2);
GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 0);
if (level==0) {
int cache;
cache= GET_CACHE(re, &s->gb);
@ -1829,7 +1829,7 @@ static inline int msmpeg4_decode_block(MpegEncContext * s, DCTELEM * block,
#else
SKIP_BITS(re, &s->gb, 2);
#endif
GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2);
GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1);
i+= run + rl->max_run[run>>7][level/qmul] + run_diff; //FIXME opt indexing
level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
LAST_SKIP_BITS(re, &s->gb, 1);
@ -1848,7 +1848,7 @@ static inline int msmpeg4_decode_block(MpegEncContext * s, DCTELEM * block,
#else
SKIP_BITS(re, &s->gb, 1);
#endif
GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2);
GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1);
i+= run;
level = level + rl->max_level[run>>7][(run-1)&63] * qmul;//FIXME opt indexing
level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);

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