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-rw-r--r--ext/hermes/rgb2yuv.c156
1 files changed, 43 insertions, 113 deletions
diff --git a/ext/hermes/rgb2yuv.c b/ext/hermes/rgb2yuv.c
index 7495c71b..6aa1e805 100644
--- a/ext/hermes/rgb2yuv.c
+++ b/ext/hermes/rgb2yuv.c
@@ -12,139 +12,69 @@
#include <gst/gst.h>
-#define RGB2YUV_SHIFT 8
-#define BY ((int)( 0.098*(1<<RGB2YUV_SHIFT)+0.5))
-#define BV ((int)(-0.071*(1<<RGB2YUV_SHIFT)+0.5))
-#define BU ((int)( 0.439*(1<<RGB2YUV_SHIFT)+0.5))
-#define GY ((int)( 0.504*(1<<RGB2YUV_SHIFT)+0.5))
-#define GV ((int)(-0.368*(1<<RGB2YUV_SHIFT)+0.5))
-#define GU ((int)(-0.291*(1<<RGB2YUV_SHIFT)+0.5))
-#define RY ((int)( 0.257*(1<<RGB2YUV_SHIFT)+0.5))
-#define RV ((int)( 0.439*(1<<RGB2YUV_SHIFT)+0.5))
-#define RU ((int)(-0.148*(1<<RGB2YUV_SHIFT)+0.5))
-
-/**
- *
- * height should be a multiple of 2 and width should be a multiple of 2 (if this is a
- * problem for anyone then tell me, and ill fix it)
- * chrominance data is only taken from every secound line others are ignored FIXME write HQ version
- */
-void
-gst_colorspace_rgb32_to_i420 (unsigned char *src, unsigned char *dest, guint width, guint height)
+#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;
- const int chrom_size = (width * height) >> 2;
+ int Y;
+ int b, g, r;
- unsigned char *ydst = dest;
- unsigned char *udst = ydst + (width * height);
- unsigned char *vdst = udst + chrom_size;
-
- for (y = 0; y < height; y += 2) {
+ for (y = height; y; y -= 2) {
int i;
- for (i = 0; i < chrom_width; i++) {
- unsigned int b = src[8 * i + 0];
- unsigned int g = src[8 * i + 1];
- unsigned int r = src[8 * i + 2];
+ for (i = chrom_width; i; i--) {
+ b = *src++;
+ g = *src++;
+ r = *src++;
+ src++;
- unsigned int Y = ((RY * r + GY * g + BY * b) >> RGB2YUV_SHIFT) + 16;
- unsigned int V = ((RV * r + GV * g + BV * b) >> RGB2YUV_SHIFT) + 128;
- unsigned int U = ((RU * r + GU * g + BU * b) >> RGB2YUV_SHIFT) + 128;
+ Y = Y_FROM_RGB (r,g,b);
- udst[i] = U;
- vdst[i] = V;
- ydst[2 * i] = Y;
+ *ydst++ = Y;
+ *udst++ = U_FROM_BY (b,Y);
+ *vdst++ = V_FROM_RY (r,Y);
- b = src[8 * i + 4];
- g = src[8 * i + 5];
- r = src[8 * i + 6];
+ b = *src++;
+ g = *src++;
+ r = *src++; src++;
- Y = ((RY * r + GY * g + BY * b) >> RGB2YUV_SHIFT) + 16;
- ydst[2 * i + 1] = Y;
+ *ydst++ = Y_FROM_RGB (r,g,b);
}
- ydst += width;
- src += (width * 4);
-
- for (i = 0; i < chrom_width; i++) {
- unsigned int b = src[8 * i + 0];
- unsigned int g = src[8 * i + 1];
- unsigned int r = src[8 * i + 2];
-
- unsigned int Y = ((RY * r + GY * g + BY * b) >> RGB2YUV_SHIFT) + 16;
- ydst[2 * i] = Y;
-
- b = src[8 * i + 4];
- g = src[8 * i + 5];
- r = src[8 * i + 6];
-
- Y = ((RY * r + GY * g + BY * b) >> RGB2YUV_SHIFT) + 16;
- ydst[2 * i + 1] = Y;
+ for (i = width; i; i--) {
+ b = *src++;
+ g = *src++;
+ r = *src++; src++;
+ *ydst++ = Y_FROM_RGB (r,g,b);
}
- udst += chrom_width;
- vdst += chrom_width;
- ydst += width;
- src += (width * 4);
}
}
void
-gst_colorspace_rgb32_to_yv12 (unsigned char *src, unsigned char *dest, guint width, guint height)
+gst_colorspace_rgb32_to_i420 (unsigned char *src, unsigned char *dest, guint width, guint height)
{
- int y;
- const int chrom_width = width >> 1;
- const int chrom_size = (width * height) >> 2;
-
unsigned char *ydst = dest;
- unsigned char *vdst = ydst + (width * height);
- unsigned char *udst = vdst + chrom_size;
-
- for (y = 0; y < height; y += 2) {
- int i;
-
- for (i = 0; i < chrom_width; i++) {
- unsigned int b = src[8 * i + 0];
- unsigned int g = src[8 * i + 1];
- unsigned int r = src[8 * i + 2];
-
- unsigned int Y = ((RY * r + GY * g + BY * b) >> RGB2YUV_SHIFT) + 16;
- unsigned int V = ((RV * r + GV * g + BV * b) >> RGB2YUV_SHIFT) + 128;
- unsigned int U = ((RU * r + GU * g + BU * b) >> RGB2YUV_SHIFT) + 128;
-
- udst[i] = U;
- vdst[i] = V;
- ydst[2 * i] = Y;
-
- b = src[8 * i + 4];
- g = src[8 * i + 5];
- r = src[8 * i + 6];
-
- Y = ((RY * r + GY * g + BY * b) >> RGB2YUV_SHIFT) + 16;
- ydst[2 * i + 1] = Y;
- }
- ydst += width;
- src += (width * 4);
-
- for (i = 0; i < chrom_width; i++) {
- unsigned int b = src[8 * i + 0];
- unsigned int g = src[8 * i + 1];
- unsigned int r = src[8 * i + 2];
-
- unsigned int Y = ((RY * r + GY * g + BY * b) >> RGB2YUV_SHIFT) + 16;
+ unsigned char *udst = ydst + (width * height);
+ unsigned char *vdst = udst + ((width * height) >> 2);
- ydst[2 * i] = Y;
+ gst_colorspace_rgb32_to_yuv (src, ydst, udst, vdst, width, height);
+}
- b = src[8 * i + 4];
- g = src[8 * i + 5];
- r = src[8 * i + 6];
+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);
- Y = ((RY * r + GY * g + BY * b) >> RGB2YUV_SHIFT) + 16;
- ydst[2 * i + 1] = Y;
- }
- udst += chrom_width;
- vdst += chrom_width;
- ydst += width;
- src += (width * 4);
- }
+ gst_colorspace_rgb32_to_yuv (src, ydst, udst, vdst, width, height);
}
generated by cgit v1.2.1 (git 2.18.0) at 2024-11-01 15:10:15 +0000