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wcap: Convert argb to yv12 using integer math instead

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Drop from 8% in the profile to 1.8%.
This commit is contained in:
Kristian Høgsberg 2012-05-30 15:01:03 -04:00
parent 86aa5fbbe6
commit f7a69642a9
1 changed files with 9 additions and 7 deletions
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16
wcap/vpxenc.c
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@ -335,27 +335,29 @@ static inline int rgb_to_yuv(uint32_t format, uint32_t p, int *u, int *v)
break;
}
y = 0.299 * r + 0.587 * g + 0.114 * b;
y = (19595 * r + 38469 * g + 7472 * b) >> 16;
if (y > 255)
y = 255;
*u += 0.713 * (r - y);
*v += 0.564 * (b - y);
*u += 46727 * (r - y);
*v += 36962 * (b - y);
return y;
}
static inline int clamp_uv(int u)
{
if (u < -512)
int clamp = (u >> 18) + 128;
if (clamp < 0)
return 0;
else if (u > 511)
else if (clamp > 255)
return 255;
else
return u / 4 + 128;
return clamp;
}
static void convert_to_yv12(struct wcap_decoder *wcap, vpx_image_t *img)
void convert_to_yv12(struct wcap_decoder *wcap, vpx_image_t *img)
{
unsigned char *y1, *y2, *u, *v;
uint32_t *p1, *p2, *end;