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vp3: The DC-only IDCT is surprisingly not supposed to be bitexact to the

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full IDCT. Fix this.

Originally committed as revision 23358 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
David Conrad 2010-05-28 07:01:34 +00:00
parent 173bb37f82
commit 179655b6c6
1 changed files with 1 additions and 3 deletions
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4
libavcodec/x86/vp3dsp_mmx.c
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@ -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"