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Avoid wasting 4 cpu cycles per MB in redundantly calculating qp_thresh. 

Originally committed as revision 21243 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2010-01-16 11:55:35 +00:00
parent 3e906f4cfb
commit 2e36c931f0
3 changed files with 4 additions and 1 deletions
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1
libavcodec/h264.c
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@ -2110,6 +2110,7 @@ static int decode_slice_header(H264Context *h, H264Context *h0){
return 1; // deblocking switched inside frame
}
}
h->qp_thresh= 15 - h->slice_alpha_c0_offset - FFMAX3(0, h->pps.chroma_qp_index_offset[0], h->pps.chroma_qp_index_offset[1]);
#if 0 //FMO
if( h->pps.num_slice_groups > 1 && h->pps.mb_slice_group_map_type >= 3 && h->pps.mb_slice_group_map_type <= 5)

2
libavcodec/h264.h
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@ -273,6 +273,8 @@ typedef struct H264Context{
int chroma_qp[2]; //QPc
int qp_thresh; ///< QP threshold to skip loopfilter
int prev_mb_skipped;
int next_mb_skipped;

2
libavcodec/h264_loopfilter.c
View File

@ -654,7 +654,7 @@ void ff_h264_filter_mb( H264Context *h, int mb_x, int mb_y, uint8_t *img_y, uint
//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(!FRAME_MBAFF){
int qp_thresh = 15 - h->slice_alpha_c0_offset - FFMAX3(0, h->pps.chroma_qp_index_offset[0], h->pps.chroma_qp_index_offset[1]);
int qp_thresh = h->qp_thresh;
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)