mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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93e9ac34a1
Original commit message from CVS: Bring the plugins in sync with the new core capsnego system. Added some features, enhancements...
150 lines
4 KiB
C
150 lines
4 KiB
C
/*
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*
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* rgb2rgb.c, Software RGB to YUV convertor
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* Written by Nick Kurshev.
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* palette & yuv & runtime cpu stuff by Michael (michaelni@gmx.at) (under GPL)
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*/
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#include "config.h"
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#include <math.h>
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#include <stdlib.h>
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#include <gst/gst.h>
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#define RGB2YUV_SHIFT 8
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#define BY ((int)( 0.098*(1<<RGB2YUV_SHIFT)+0.5))
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#define BV ((int)(-0.071*(1<<RGB2YUV_SHIFT)+0.5))
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#define BU ((int)( 0.439*(1<<RGB2YUV_SHIFT)+0.5))
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#define GY ((int)( 0.504*(1<<RGB2YUV_SHIFT)+0.5))
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#define GV ((int)(-0.368*(1<<RGB2YUV_SHIFT)+0.5))
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#define GU ((int)(-0.291*(1<<RGB2YUV_SHIFT)+0.5))
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#define RY ((int)( 0.257*(1<<RGB2YUV_SHIFT)+0.5))
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#define RV ((int)( 0.439*(1<<RGB2YUV_SHIFT)+0.5))
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#define RU ((int)(-0.148*(1<<RGB2YUV_SHIFT)+0.5))
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/**
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*
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* height should be a multiple of 2 and width should be a multiple of 2 (if this is a
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* problem for anyone then tell me, and ill fix it)
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* chrominance data is only taken from every secound line others are ignored FIXME write HQ version
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*/
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void
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gst_colorspace_rgb32_to_i420 (unsigned char *src, unsigned char *dest, guint width, guint height)
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{
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int y;
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const int chrom_width = width >> 1;
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const int chrom_size = (width * height) >> 2;
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unsigned char *ydst = dest;
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unsigned char *udst = ydst + (width * height);
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unsigned char *vdst = udst + chrom_size;
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for (y = 0; y < height; y += 2) {
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int i;
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for (i = 0; i < chrom_width; i++) {
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unsigned int b = src[8 * i + 0];
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unsigned int g = src[8 * i + 1];
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unsigned int r = src[8 * i + 2];
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unsigned int Y = ((RY * r + GY * g + BY * b) >> RGB2YUV_SHIFT) + 16;
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unsigned int V = ((RV * r + GV * g + BV * b) >> RGB2YUV_SHIFT) + 128;
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unsigned int U = ((RU * r + GU * g + BU * b) >> RGB2YUV_SHIFT) + 128;
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udst[i] = U;
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vdst[i] = V;
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ydst[2 * i] = Y;
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b = src[8 * i + 4];
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g = src[8 * i + 5];
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r = src[8 * i + 6];
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Y = ((RY * r + GY * g + BY * b) >> RGB2YUV_SHIFT) + 16;
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ydst[2 * i + 1] = Y;
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}
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ydst += width;
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src += (width * 4);
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for (i = 0; i < chrom_width; i++) {
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unsigned int b = src[8 * i + 0];
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unsigned int g = src[8 * i + 1];
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unsigned int r = src[8 * i + 2];
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unsigned int Y = ((RY * r + GY * g + BY * b) >> RGB2YUV_SHIFT) + 16;
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ydst[2 * i] = Y;
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b = src[8 * i + 4];
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g = src[8 * i + 5];
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r = src[8 * i + 6];
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Y = ((RY * r + GY * g + BY * b) >> RGB2YUV_SHIFT) + 16;
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ydst[2 * i + 1] = Y;
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}
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udst += chrom_width;
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vdst += chrom_width;
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ydst += width;
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src += (width * 4);
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}
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}
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void
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gst_colorspace_rgb32_to_yv12 (unsigned char *src, unsigned char *dest, guint width, guint height)
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{
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int y;
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const int chrom_width = width >> 1;
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const int chrom_size = (width * height) >> 2;
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unsigned char *ydst = dest;
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unsigned char *vdst = ydst + (width * height);
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unsigned char *udst = vdst + chrom_size;
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for (y = 0; y < height; y += 2) {
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int i;
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for (i = 0; i < chrom_width; i++) {
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unsigned int b = src[8 * i + 0];
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unsigned int g = src[8 * i + 1];
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unsigned int r = src[8 * i + 2];
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unsigned int Y = ((RY * r + GY * g + BY * b) >> RGB2YUV_SHIFT) + 16;
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unsigned int V = ((RV * r + GV * g + BV * b) >> RGB2YUV_SHIFT) + 128;
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unsigned int U = ((RU * r + GU * g + BU * b) >> RGB2YUV_SHIFT) + 128;
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udst[i] = U;
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vdst[i] = V;
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ydst[2 * i] = Y;
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b = src[8 * i + 4];
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g = src[8 * i + 5];
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r = src[8 * i + 6];
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Y = ((RY * r + GY * g + BY * b) >> RGB2YUV_SHIFT) + 16;
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ydst[2 * i + 1] = Y;
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}
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ydst += width;
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src += (width * 4);
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for (i = 0; i < chrom_width; i++) {
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unsigned int b = src[8 * i + 0];
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unsigned int g = src[8 * i + 1];
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unsigned int r = src[8 * i + 2];
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unsigned int Y = ((RY * r + GY * g + BY * b) >> RGB2YUV_SHIFT) + 16;
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ydst[2 * i] = Y;
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b = src[8 * i + 4];
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g = src[8 * i + 5];
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r = src[8 * i + 6];
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Y = ((RY * r + GY * g + BY * b) >> RGB2YUV_SHIFT) + 16;
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ydst[2 * i + 1] = Y;
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}
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udst += chrom_width;
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vdst += chrom_width;
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ydst += width;
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src += (width * 4);
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}
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}
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