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| author | David Conrad <lessen42@gmail.com> | 2010-05-28 07:01:34 +0000 |
|---|---|---|
| committer | David Conrad <lessen42@gmail.com> | 2010-05-28 07:01:34 +0000 |
| commit | 179655b6c6f27cca2089844046bc5f280bb83814 (patch) | |
| tree | 5c5ea24eeda3a6fd829c307b30b593df142c7ed9 /libavcodec/x86 | |
| parent | 173bb37f8239cd2ea27d7e2bf1bcfc21485df598 (diff) | |
| download | ffmpeg-179655b6c6f27cca2089844046bc5f280bb83814.tar.gz | |
vp3: The DC-only IDCT is surprisingly not supposed to be bitexact to the
full IDCT. Fix this.
Originally committed as revision 23358 to svn://svn.ffmpeg.org/ffmpeg/trunk
Diffstat (limited to 'libavcodec/x86')
| -rw-r--r-- | libavcodec/x86/vp3dsp_mmx.c | 4 |
1 files changed, 1 insertions, 3 deletions
diff --git a/libavcodec/x86/vp3dsp_mmx.c b/libavcodec/x86/vp3dsp_mmx.c index 44a8477a89..188240dd08 100644 --- a/libavcodec/x86/vp3dsp_mmx.c +++ b/libavcodec/x86/vp3dsp_mmx.c @@ -398,9 +398,7 @@ void ff_vp3_idct_add_mmx(uint8_t *dest, int line_size, DCTELEM *block) void ff_vp3_idct_dc_add_mmx2(uint8_t *dest, int linesize, const DCTELEM *block) { - int dc = block[0]; - dc = (46341*dc)>>16; - dc = (46341*dc + (8<<16))>>20; + int dc = (block[0] + 15) >> 5; __asm__ volatile( "movd %3, %%mm0 \n\t" |