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Code Issues Releases Activity

decrease ff_h264_norm_shift[] size

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Originally committed as revision 6596 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer
2006-10-09 00:59:42 +00:00
parent 158256a13a
commit c010d69a75
2 changed files with 9 additions and 17 deletions
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20
libavcodec/cabac.c
View File

@@ -72,23 +72,15 @@ const uint8_t ff_h264_lps_state[64]= {
36,36,37,37,37,38,38,63, 36,36,37,37,37,38,38,63,
}; };
const uint8_t ff_h264_norm_shift[256]= { const uint8_t ff_h264_norm_shift[128]= {
9,8,7,7,6,6,6,6,5,5,5,5,5,5,5,5, 7,6,5,5,4,4,4,4,3,3,3,3,3,3,3,3,
4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,
3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,
3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,
2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,
2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,
2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,
2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2, 2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,
1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
}; };
/** /**

6
libavcodec/cabac.h
View File

@@ -51,7 +51,7 @@ typedef struct CABACContext{
extern const uint8_t ff_h264_lps_range[64][4]; extern const uint8_t ff_h264_lps_range[64][4];
extern const uint8_t ff_h264_mps_state[64]; extern const uint8_t ff_h264_mps_state[64];
extern const uint8_t ff_h264_lps_state[64]; extern const uint8_t ff_h264_lps_state[64];
extern const uint8_t ff_h264_norm_shift[256]; extern const uint8_t ff_h264_norm_shift[128];
void ff_init_cabac_encoder(CABACContext *c, uint8_t *buf, int buf_size); void ff_init_cabac_encoder(CABACContext *c, uint8_t *buf, int buf_size);
@@ -270,7 +270,7 @@ static void refill2(CABACContext *c){
int i, x; int i, x;
x= c->low ^ (c->low-1); x= c->low ^ (c->low-1);
i= 9 - ff_h264_norm_shift[x>>(CABAC_BITS+1)]; i= 7 - ff_h264_norm_shift[x>>(CABAC_BITS+1)];
x= -CABAC_MASK; x= -CABAC_MASK;
@@ -393,7 +393,7 @@ asm(
#endif #endif
renorm_cabac_decoder_once(c); renorm_cabac_decoder_once(c);
}else{ }else{
bit= ff_h264_norm_shift[RangeLPS>>17]; bit= ff_h264_norm_shift[RangeLPS>>19];
c->low -= c->range; c->low -= c->range;
*state= c->lps_state[s]; *state= c->lps_state[s];
c->range = RangeLPS<<bit; c->range = RangeLPS<<bit;