gstreamer/ext/hermes/rgb2yuv.c

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/*
*
* rgb2rgb.c, Software RGB to YUV convertor
* Written by Nick Kurshev.
* palette & yuv & runtime cpu stuff by Michael (michaelni@gmx.at) (under GPL)
*/
#include "config.h"
#include <math.h>
#include <stdlib.h>
#include <gst/gst.h>
#define Y_FROM_RGB(r,g,b) ((9798 * (r) + 19235 * (g) + 3736 * (b)) >> 15)
#define U_FROM_BY(b,y) ((16122 * ((b) - (y))) >> 15) + 128;
#define V_FROM_RY(r,y) ((25203 * ((r) - (y))) >> 15) + 128;
static void
gst_colorspace_rgb32_to_yuv (unsigned char *src,
unsigned char *ydst,
unsigned char *udst,
unsigned char *vdst,
guint width, guint height)
{
int y;
const int chrom_width = width >> 1;
int Y;
int b, g, r;
for (y = height; y; y -= 2) {
int i;
for (i = chrom_width; i; i--) {
b = *src++;
g = *src++;
r = *src++;
src++;
Y = Y_FROM_RGB (r,g,b);
*ydst++ = Y;
*udst++ = U_FROM_BY (b,Y);
*vdst++ = V_FROM_RY (r,Y);
b = *src++;
g = *src++;
r = *src++; src++;
*ydst++ = Y_FROM_RGB (r,g,b);
}
for (i = width; i; i--) {
b = *src++;
g = *src++;
r = *src++; src++;
*ydst++ = Y_FROM_RGB (r,g,b);
}
}
}
void
gst_colorspace_rgb32_to_i420 (unsigned char *src, unsigned char *dest, guint width, guint height)
{
unsigned char *ydst = dest;
unsigned char *udst = ydst + (width * height);
unsigned char *vdst = udst + ((width * height) >> 2);
gst_colorspace_rgb32_to_yuv (src, ydst, udst, vdst, width, height);
}
void
gst_colorspace_rgb32_to_yv12 (unsigned char *src, unsigned char *dest, guint width, guint height)
{
unsigned char *ydst = dest;
unsigned char *vdst = ydst + (width * height);
unsigned char *udst = vdst + ((width * height) >> 2);
gst_colorspace_rgb32_to_yuv (src, ydst, udst, vdst, width, height);
}