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| author | Michael Niedermayer <michaelni@gmx.at> | 2008-12-23 19:10:46 +0000 |
|---|---|---|
| committer | Michael Niedermayer <michaelni@gmx.at> | 2008-12-23 19:10:46 +0000 |
| commit | d42fc4a8caa7f486ae976c94416861e61d15a872 (patch) | |
| tree | f6f7f6c837456d78a2469a5022816862900e0bcf /libavcodec/h264.c | |
| parent | 593af7cddab232fb9c14f3df7a01b514ae66d575 (diff) | |
Use the new VLC table for the first non trailing coeff too.
Sadly only 5 cycles faster here on pentium dual. So maybe the
complexity is not worth it and this should be reverted ...
Originally committed as revision 16295 to svn://svn.ffmpeg.org/ffmpeg/trunk
Diffstat (limited to 'libavcodec/h264.c')
| -rw-r--r-- | libavcodec/h264.c | 23 |
1 files changed, 18 insertions, 5 deletions
diff --git a/libavcodec/h264.c b/libavcodec/h264.c index b3d3575a9d..b9551cc4b2 100644 --- a/libavcodec/h264.c +++ b/libavcodec/h264.c @@ -4142,9 +4142,16 @@ static int decode_residual(H264Context *h, GetBitContext *gb, DCTELEM *block, in level[2] = 1-((i&1)<<1); if(trailing_ones<total_coeff) { - int level_code, mask; + int mask, prefix; int suffix_length = total_coeff > 10 && trailing_ones < 3; - int prefix= get_level_prefix(gb); + int bitsi= show_bits(gb, LEVEL_TAB_BITS); + int level_code= cavlc_level_tab[suffix_length][bitsi][0]; + + skip_bits(gb, cavlc_level_tab[suffix_length][bitsi][1]); + if(level_code >= 100){ + prefix= level_code - 100; + if(prefix == LEVEL_TAB_BITS) + prefix += get_level_prefix(gb); //first coefficient has suffix_length equal to 0 or 1 if(prefix<14){ //FIXME try to build a large unified VLC table for all this @@ -4166,11 +4173,17 @@ static int decode_residual(H264Context *h, GetBitContext *gb, DCTELEM *block, in if(trailing_ones < 3) level_code += 2; - suffix_length = 1; - if(level_code > 5) - suffix_length++; + suffix_length = 2; mask= -(level_code&1); level[trailing_ones]= (((2+level_code)>>1) ^ mask) - mask; + }else{ + if(trailing_ones < 3) level_code += (level_code>>31)|1; + + suffix_length = 1; + if(level_code + 3U > 6U) + suffix_length++; + level[trailing_ones]= level_code; + } //remaining coefficients have suffix_length > 0 for(i=trailing_ones+1;i<total_coeff;i++) { |