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adpcm: Only increment heap_pos after finding a good enough sample

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This increases the PSNR slightly (about 0.1 dB) for trellis sizes
below 8, and gives equal PSNR for sizes above that.

Originally committed as revision 25769 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Martin Storsjö 2010-11-19 17:36:29 +00:00
parent d764e3ece9
commit 78f9d35c9a
1 changed files with 2 additions and 1 deletions
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libavcodec/adpcm.c
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@ -401,9 +401,10 @@ static void adpcm_compress_trellis(AVCodecContext *avctx, const short *samples,
} else {\
/* Try to replace one of the leaf nodes with the new \
* one, but try a different slot each time. */\
pos = (frontier >> 1) + (heap_pos++ & ((frontier >> 1) - 1));\
pos = (frontier >> 1) + (heap_pos & ((frontier >> 1) - 1));\
if (ssd > nodes_next[pos]->ssd)\
goto next_##NAME;\
heap_pos++;\
}\
*h = generation;\
u = nodes_next[pos];\