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| author | Yaowu Xu <yaowu@google.com> | 2013-05-30 14:24:12 -0700 |
|---|---|---|
| committer | Yaowu Xu <yaowu@google.com> | 2013-05-30 15:37:52 -0700 |
| commit | 042e70e45e74ad5105d1c9f35375350000b56b39 (patch) | |
| tree | 03dc7d3ac81f2421da4869ad7ca2f06f7091a499 /vp9/encoder | |
| parent | 5e97862a71b69ae9c552084386a5dd86df74e3dc (diff) | |
| download | libvpx-042e70e45e74ad5105d1c9f35375350000b56b39.tar libvpx-042e70e45e74ad5105d1c9f35375350000b56b39.tar.gz libvpx-042e70e45e74ad5105d1c9f35375350000b56b39.tar.bz2 libvpx-042e70e45e74ad5105d1c9f35375350000b56b39.zip | |
Changed to use a new variant of WHT
The commit changed to use a new variant of Walsh-Hadamard Transform
by Tim Terriberry. This new variant has the best compression among a
number of variants that developed by Tim.
Change-Id: Icb3a88515463cfc644b17ca046fcd139db2557e9
Diffstat (limited to 'vp9/encoder')
| -rw-r--r-- | vp9/encoder/vp9_dct.c | 30 |
1 files changed, 14 insertions, 16 deletions
diff --git a/vp9/encoder/vp9_dct.c b/vp9/encoder/vp9_dct.c index d22644424..8d4eec139 100644 --- a/vp9/encoder/vp9_dct.c +++ b/vp9/encoder/vp9_dct.c @@ -606,14 +606,13 @@ void vp9_short_walsh4x4_c(short *input, short *output, int pitch) { c1 = ip[2 * pitch_short]; d1 = ip[3 * pitch_short]; - b1 = a1 - b1; - c1 += d1; - e1 = (c1 - b1) >> 1; - a1 += e1; - d1 -= e1; - c1 = a1 - c1; - b1 -= d1; - + a1 += b1; + d1 = d1 - c1; + e1 = (a1 - d1) >> 1; + b1 = e1 - b1; + c1 = e1 - c1; + a1 -= c1; + d1 += b1; op[0] = a1; op[4] = c1; op[8] = d1; @@ -631,14 +630,13 @@ void vp9_short_walsh4x4_c(short *input, short *output, int pitch) { c1 = ip[2]; d1 = ip[3]; - b1 = a1 - b1; - c1 += d1; - e1 = (c1 - b1) >> 1; - a1 += e1; - d1 -= e1; - c1 = a1 - c1; - b1 -= d1; - + a1 += b1; + d1 -= c1; + e1 = (a1 - d1) >> 1; + b1 = e1 - b1; + c1 = e1 - c1; + a1 -= c1; + d1 += b1; op[0] = a1 << WHT_UPSCALE_FACTOR; op[1] = c1 << WHT_UPSCALE_FACTOR; op[2] = d1 << WHT_UPSCALE_FACTOR; |