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Coalescing the un-weighting and de-quantization steps for faster

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processing

Originally committed as revision 14691 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Roman Shaposhnik
2008-08-11 09:35:58 +00:00
parent 76c655fb8f
commit d557838cfb
2 changed files with 19 additions and 51 deletions
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23
libavcodec/dvdata.h
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@@ -286,28 +286,6 @@ static const uint8_t dv_vlc_level[409] = {
};
/* unquant tables (not used directly) */
static const uint8_t dv_88_areas[64] = {
0,0,0,1,1,1,2,2,
0,0,1,1,1,2,2,2,
0,1,1,1,2,2,2,3,
1,1,1,2,2,2,3,3,
1,1,2,2,2,3,3,3,
1,2,2,2,3,3,3,3,
2,2,2,3,3,3,3,3,
2,2,3,3,3,3,3,3,
};
static const uint8_t dv_248_areas[64] = {
0,0,1,1,1,2,2,3,
0,0,1,1,2,2,2,3,
0,1,1,2,2,2,3,3,
0,1,1,2,2,2,3,3,
1,1,2,2,2,3,3,3,
1,1,2,2,2,3,3,3,
1,2,2,2,3,3,3,3,
1,2,2,3,3,3,3,3,
};
static const uint8_t dv_quant_shifts[22][4] = {
{ 3,3,4,4 },
{ 3,3,4,4 },
@@ -334,6 +312,7 @@ static const uint8_t dv_quant_shifts[22][4] = {
};
static const uint8_t dv_quant_offset[4] = { 6, 3, 0, 1 };
static const uint8_t dv_quant_areas[4] = { 6, 21, 43, 64 };
/* NOTE: I prefer hardcoding the positioning of dv blocks, it is
simpler :-) */