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H264: Don't deblock if alpha or beta is 0. 

This ensures that the MMX loop filter is always bitexact with the C version.
Patch by Haruhiko Yamagata <h.yamagata _a_ nifty com>

Originally committed as revision 18923 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Haruhiko Yamagata 2009-05-24 03:39:20 +00:00 committed by David Conrad
parent a7e6312b1e
commit 86b0e9948b
1 changed files with 4 additions and 0 deletions
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4
libavcodec/h264.c
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@ -6003,6 +6003,7 @@ static void filter_mb_edgev( H264Context *h, uint8_t *pix, int stride, int16_t b
const int index_a = qp + h->slice_alpha_c0_offset;
const int alpha = (alpha_table+52)[index_a];
const int beta = (beta_table+52)[qp + h->slice_beta_offset];
if (alpha ==0 || beta == 0) return;
if( bS[0] < 4 ) {
int8_t tc[4];
@ -6019,6 +6020,7 @@ static void filter_mb_edgecv( H264Context *h, uint8_t *pix, int stride, int16_t
const int index_a = qp + h->slice_alpha_c0_offset;
const int alpha = (alpha_table+52)[index_a];
const int beta = (beta_table+52)[qp + h->slice_beta_offset];
if (alpha ==0 || beta == 0) return;
if( bS[0] < 4 ) {
int8_t tc[4];
@ -6187,6 +6189,7 @@ static void filter_mb_edgeh( H264Context *h, uint8_t *pix, int stride, int16_t b
const int index_a = qp + h->slice_alpha_c0_offset;
const int alpha = (alpha_table+52)[index_a];
const int beta = (beta_table+52)[qp + h->slice_beta_offset];
if (alpha ==0 || beta == 0) return;
if( bS[0] < 4 ) {
int8_t tc[4];
@ -6204,6 +6207,7 @@ static void filter_mb_edgech( H264Context *h, uint8_t *pix, int stride, int16_t
const int index_a = qp + h->slice_alpha_c0_offset;
const int alpha = (alpha_table+52)[index_a];
const int beta = (beta_table+52)[qp + h->slice_beta_offset];
if (alpha ==0 || beta == 0) return;
if( bS[0] < 4 ) {
int8_t tc[4];