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Use table to speedup access to non_zero_count in MBAFF with differing interlacing. 

~4 cpu cycles speedup

Originally committed as revision 21474 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2010-01-27 11:14:29 +00:00
parent e8a9d01846
commit e470ef7641
1 changed files with 11 additions and 1 deletions
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12
libavcodec/h264_loopfilter.c
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@ -632,6 +632,16 @@ void ff_h264_filter_mb( H264Context *h, int mb_x, int mb_y, uint8_t *img_y, uint
*(uint64_t*)&bS[0]=
*(uint64_t*)&bS[4]= 0x0004000400040004ULL;
else {
static const uint8_t offset[2][2][8]={
{
{7+8*0, 7+8*0, 7+8*0, 7+8*0, 7+8*1, 7+8*1, 7+8*1, 7+8*1},
{7+8*2, 7+8*2, 7+8*2, 7+8*2, 7+8*3, 7+8*3, 7+8*3, 7+8*3},
},{
{7+8*0, 7+8*1, 7+8*2, 7+8*3, 7+8*0, 7+8*1, 7+8*2, 7+8*3},
{7+8*0, 7+8*1, 7+8*2, 7+8*3, 7+8*0, 7+8*1, 7+8*2, 7+8*3},
}
};
const uint8_t *off= offset[MB_FIELD][mb_y&1];
for( i = 0; i < 8; i++ ) {
int j= MB_FIELD ? i>>2 : i&1;
int mbn_xy = h->left_mb_xy[j];
@ -644,7 +654,7 @@ void ff_h264_filter_mb( H264Context *h, int mb_x, int mb_y, uint8_t *img_y, uint
((!h->pps.cabac && IS_8x8DCT(mbn_type)) ?
(h->cbp_table[mbn_xy] & ((MB_FIELD ? (i&2) : (mb_y&1)) ? 8 : 2))
:
h->non_zero_count[mbn_xy][7+(MB_FIELD ? (i&3) : (i>>2)+(mb_y&1)*2)*8]));
h->non_zero_count[mbn_xy][ off[i] ]));
}
}
}