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Speedup decode_cabac_field_decoding_flag() by 9 cpu cycles. 

Originally committed as revision 21875 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2010-02-18 12:13:21 +00:00
parent 077a8d61c0
commit 90a5849efd
1 changed files with 1 additions and 2 deletions
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3
libavcodec/h264_cabac.c
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@ -707,12 +707,11 @@ void ff_h264_init_cabac_states(H264Context *h) {
static int decode_cabac_field_decoding_flag(H264Context *h) {
MpegEncContext * const s = &h->s;
const long mba_xy = h->mb_xy - 1L;
const long mbb_xy = h->mb_xy - 2L*s->mb_stride;
unsigned long ctx = 0;
ctx += (s->current_picture.mb_type[mba_xy]>>7)&(h->slice_table[mba_xy] == h->slice_num);
ctx += h->mb_field_decoding_flag & !!s->mb_x; //for FMO:(s->current_picture.mb_type[mba_xy]>>7)&(h->slice_table[mba_xy] == h->slice_num);
ctx += (s->current_picture.mb_type[mbb_xy]>>7)&(h->slice_table[mbb_xy] == h->slice_num);
return get_cabac_noinline( &h->cabac, &(h->cabac_state+70)[ctx] );