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slightly faster loopfilter 

Originally committed as revision 4958 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Loren Merritt 2006-02-08 07:04:32 +00:00
parent 4accd1fd18
commit c0234aa44c
1 changed files with 14 additions and 2 deletions
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16
libavcodec/h264.c
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@ -6547,6 +6547,18 @@ static void filter_mb( H264Context *h, int mb_x, int mb_y, uint8_t *img_y, uint8
* frame numbers, not indices. */
static const int ref2frm[18] = {-1,-1,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15};
//for sufficiently low qp, filtering wouldn't do anything
//this is a conservative estimate: could also check beta_offset and more accurate chroma_qp
if(!h->mb_aff_frame){
int qp_thresh = 15 - h->slice_alpha_c0_offset - FFMAX(0, h->pps.chroma_qp_index_offset);
int qp = s->current_picture.qscale_table[mb_xy];
if(qp <= qp_thresh
&& (mb_x == 0 || ((qp + s->current_picture.qscale_table[mb_xy-1] + 1)>>1) <= qp_thresh)
&& (mb_y == 0 || ((qp + s->current_picture.qscale_table[h->top_mb_xy] + 1)>>1) <= qp_thresh)){
return;
}
}
if (h->mb_aff_frame
// left mb is in picture
&& h->slice_table[mb_xy-1] != 255
@ -6617,8 +6629,8 @@ static void filter_mb( H264Context *h, int mb_x, int mb_y, uint8_t *img_y, uint8
const int mbm_type = s->current_picture.mb_type[mbm_xy];
int start = h->slice_table[mbm_xy] == 255 ? 1 : 0;
const int edges = ((mb_type & mbm_type) & (MB_TYPE_16x16|MB_TYPE_SKIP))
== (MB_TYPE_16x16|MB_TYPE_SKIP) ? 1 : 4;
const int edges = (mb_type & (MB_TYPE_16x16|MB_TYPE_SKIP))
== (MB_TYPE_16x16|MB_TYPE_SKIP) ? 1 : 4;
// how often to recheck mv-based bS when iterating between edges
const int mask_edge = (mb_type & (MB_TYPE_16x16 | (MB_TYPE_16x8 << dir))) ? 3 :
(mb_type & (MB_TYPE_8x16 >> dir)) ? 1 : 0;