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Make calculation of mask_edge free of branches, faster of course but probably

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little effect overall as this is not that often executed.

Originally committed as revision 21366 to svn://svn.ffmpeg.org/ffmpeg/trunk
release/0.6
Michael Niedermayer 15 years ago
parent b4d68544c8
commit 31f6e3c19e
1 changed files with 3 additions and 2 deletions
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  1. 5
      libavcodec/h264_loopfilter.c

5
libavcodec/h264_loopfilter.c
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@ -434,8 +434,9 @@ static av_always_inline void filter_mb_dir(H264Context *h, int mb_x, int mb_y, u
const int edges = (mb_type & (MB_TYPE_16x16|MB_TYPE_SKIP)) const int edges = (mb_type & (MB_TYPE_16x16|MB_TYPE_SKIP))
== (MB_TYPE_16x16|MB_TYPE_SKIP) ? 1 : 4; == (MB_TYPE_16x16|MB_TYPE_SKIP) ? 1 : 4;
// how often to recheck mv-based bS when iterating between edges // 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 : static const uint8_t mask_edge_tab[2][8]={{0,3,3,3,1,1,1,1},
(mb_type & (MB_TYPE_8x16 >> dir)) ? 1 : 0; {0,3,1,1,3,3,3,3}};
const int mask_edge = mask_edge_tab[dir][(mb_type>>3)&7];
// how often to recheck mv-based bS when iterating along each edge // how often to recheck mv-based bS when iterating along each edge
const int mask_par0 = mb_type & (MB_TYPE_16x16 | (MB_TYPE_8x16 >> dir)); const int mask_par0 = mb_type & (MB_TYPE_16x16 | (MB_TYPE_8x16 >> dir));
int start = h->slice_table[mbm_xy] == 0xFFFF int start = h->slice_table[mbm_xy] == 0xFFFF

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