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Small h264 decoding speed optimization: while->do/while

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Originally committed as revision 14459 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Jason Garrett-Glaser
2008-07-28 15:42:49 +00:00
parent 2754fe8ba5
commit aa6a89aa79
1 changed files with 3 additions and 3 deletions
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6
libavcodec/h264.c
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@@ -5356,10 +5356,10 @@ static av_always_inline void decode_cabac_residual_internal( H264Context *h, DCT
} }
} }
while( coeff_count-- ) { do {
uint8_t *ctx = coeff_abs_level1_ctx[node_ctx] + abs_level_m1_ctx_base; uint8_t *ctx = coeff_abs_level1_ctx[node_ctx] + abs_level_m1_ctx_base;
int j= scantable[index[coeff_count]]; int j= scantable[index[--coeff_count]];
if( get_cabac( CC, ctx ) == 0 ) { if( get_cabac( CC, ctx ) == 0 ) {
node_ctx = coeff_abs_level_transition[0][node_ctx]; node_ctx = coeff_abs_level_transition[0][node_ctx];
@@ -5396,7 +5396,7 @@ static av_always_inline void decode_cabac_residual_internal( H264Context *h, DCT
block[j] = (get_cabac_bypass_sign( CC, -coeff_abs ) * qmul[j] + 32) >> 6; block[j] = (get_cabac_bypass_sign( CC, -coeff_abs ) * qmul[j] + 32) >> 6;
} }
} }
} } while( coeff_count );
#ifdef CABAC_ON_STACK #ifdef CABAC_ON_STACK
h->cabac.range = cc.range ; h->cabac.range = cc.range ;
h->cabac.low = cc.low ; h->cabac.low = cc.low ;