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avcodec/cfhd: improve decompanding quality with reference implementation

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pull/345/head
Paul B Mahol 5 years ago
parent f7e35c8163
commit 131d2a3e1c
2 changed files with 12 additions and 12 deletions
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  1. 4
      libavcodec/cfhd.c
  2. 20
      tests/ref/fate/cfhd-3

4
libavcodec/cfhd.c
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@ -117,8 +117,8 @@ static inline int dequant_and_decompand(int level, int quantisation, int codeboo
{
if (codebook == 0 || codebook == 1) {
int64_t abslevel = abs(level);
if (level < 264)
return (abslevel + ((768 * abslevel * abslevel * abslevel) / (255 * 255 * 255))) *
if (abslevel < 256)
return (abslevel + ((768 * abslevel * abslevel * abslevel) / (256 * 256 * 256))) *
FFSIGN(level) * quantisation;
else
return level * quantisation;

20
tests/ref/fate/cfhd-3
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@ -3,13 +3,13 @@
#codec_id 0: rawvideo
#dimensions 0: 496x241
#sar 0: 0/1
0, 0, 0, 1, 478144, 0x48a01dbb
0, 1, 1, 1, 478144, 0x48a01dbb
0, 2, 2, 1, 478144, 0x48a01dbb
0, 3, 3, 1, 478144, 0xb978a72f
0, 4, 4, 1, 478144, 0x7bbb4679
0, 5, 5, 1, 478144, 0xc3fd3f59
0, 6, 6, 1, 478144, 0xfd2a4816
0, 7, 7, 1, 478144, 0x207f65d3
0, 8, 8, 1, 478144, 0x207f65d3
0, 9, 9, 1, 478144, 0x207f65d3
0, 0, 0, 1, 478144, 0x1e5a0d6c
0, 1, 1, 1, 478144, 0x1e5a0d6c
0, 2, 2, 1, 478144, 0x1e5a0d6c
0, 3, 3, 1, 478144, 0x88788c7d
0, 4, 4, 1, 478144, 0x78643db8
0, 5, 5, 1, 478144, 0x84303909
0, 6, 6, 1, 478144, 0x8ddd4828
0, 7, 7, 1, 478144, 0xc0845d58
0, 8, 8, 1, 478144, 0xc0845d58
0, 9, 9, 1, 478144, 0xc0845d58

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