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fixing encoding at high QPs (was broken after the dct accuracy increase due to too small inverse table)

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Originally committed as revision 901 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2002-09-02 16:56:29 +00:00
parent be7109c12b
commit 1a684b3d53
1 changed files with 5 additions and 5 deletions
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10
libavcodec/i386/mpegvideo_mmx_template.c
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@ -46,9 +46,9 @@ static int RENAME(dct_quantize)(MpegEncContext *s,
if (s->mb_intra) {
int dummy;
if (n < 4)
q = s->y_dc_scale<<3;
q = s->y_dc_scale;
else
q = s->c_dc_scale<<3;
q = s->c_dc_scale;
/* note: block[0] is assumed to be positive */
if (!s->h263_aic) {
#if 1
@ -56,7 +56,7 @@ static int RENAME(dct_quantize)(MpegEncContext *s,
"xorl %%edx, %%edx \n\t"
"mul %%ecx \n\t"
: "=d" (level), "=a"(dummy)
: "a" (block[0] + (q >> 1)), "c" (inverse[q])
: "a" ((block[0]>>2) + q), "c" (inverse[q<<1])
);
#else
asm volatile (
@ -64,13 +64,13 @@ static int RENAME(dct_quantize)(MpegEncContext *s,
"divw %%cx \n\t"
"movzwl %%ax, %%eax \n\t"
: "=a" (level)
: "a" (block[0] + (q >> 1)), "c" (q)
: "a" ((block[0]>>2) + q), "c" (q<<1)
: "%edx"
);
#endif
} else
/* For AIC we skip quant/dequant of INTRADC */
level = block[0]>>3;
level = (block[0] + 4)>>3;
block[0]=0; //avoid fake overflow
// temp_block[0] = (block[0] + (q >> 1)) / q;