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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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wcap/vpxenc.c
+9 -7
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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; break;
} }
y = 0.299 * r + 0.587 * g + 0.114 * b; y = (19595 * r + 38469 * g + 7472 * b) >> 16;
if (y > 255) if (y > 255)
y = 255; y = 255;
*u += 0.713 * (r - y); *u += 46727 * (r - y);
*v += 0.564 * (b - y); *v += 36962 * (b - y);
return y; return y;
} }
static inline int clamp_uv(int u) static inline int clamp_uv(int u)
{ {
if (u < -512) int clamp = (u >> 18) + 128;
if (clamp < 0)
return 0; return 0;
else if (u > 511) else if (clamp > 255)
return 255; return 255;
else 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; unsigned char *y1, *y2, *u, *v;
uint32_t *p1, *p2, *end; uint32_t *p1, *p2, *end;