1 files changed, 229 insertions, 0 deletions
diff --git a/contrib/ffmpeg/libswscale/swscale-example.c b/contrib/ffmpeg/libswscale/swscale-example.c
new file mode 100644
index 000000000..40f04c7d0
--- /dev/null
+++ b/contrib/ffmpeg/libswscale/swscale-example.c
@@ -0,0 +1,229 @@
+/*
+ * Copyright (C) 2003 Michael Niedermayer <michaelni@gmx.at>
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <inttypes.h>
+#include <stdarg.h>
+
+#undef HAVE_AV_CONFIG_H
+#include "avutil.h"
+#include "swscale.h"
+#include "swscale_internal.h"
+#include "rgb2rgb.h"
+
+static uint64_t getSSD(uint8_t *src1, uint8_t *src2, int stride1, int stride2, int w, int h){
+	int x,y;
+	uint64_t ssd=0;
+
+//printf("%d %d\n", w, h);
+        
+	for(y=0; y<h; y++){
+		for(x=0; x<w; x++){
+			int d= src1[x + y*stride1] - src2[x + y*stride2];
+			ssd+= d*d;
+//printf("%d", abs(src1[x + y*stride1] - src2[x + y*stride2])/26 );
+		}
+//printf("\n");
+	}
+	return ssd;
+}
+
+// test by ref -> src -> dst -> out & compare out against ref
+// ref & out are YV12
+static int doTest(uint8_t *ref[3], int refStride[3], int w, int h, int srcFormat, int dstFormat, 
+                   int srcW, int srcH, int dstW, int dstH, int flags){
+	uint8_t *src[3];
+	uint8_t *dst[3];
+	uint8_t *out[3];
+	int srcStride[3], dstStride[3];
+	int i;
+	uint64_t ssdY, ssdU, ssdV;
+	struct SwsContext *srcContext, *dstContext, *outContext;
+	int res;
+	
+	res = 0;
+	for(i=0; i<3; i++){
+		// avoid stride % bpp != 0
+		if(srcFormat==PIX_FMT_RGB24 || srcFormat==PIX_FMT_BGR24)
+			srcStride[i]= srcW*3;
+		else
+			srcStride[i]= srcW*4;
+		
+		if(dstFormat==PIX_FMT_RGB24 || dstFormat==PIX_FMT_BGR24)
+			dstStride[i]= dstW*3;
+		else
+			dstStride[i]= dstW*4;
+	
+		src[i]= (uint8_t*) malloc(srcStride[i]*srcH);
+		dst[i]= (uint8_t*) malloc(dstStride[i]*dstH);
+		out[i]= (uint8_t*) malloc(refStride[i]*h);
+		if ((src[i] == NULL) || (dst[i] == NULL) || (out[i] == NULL)) {
+			perror("Malloc");
+			res = -1;
+
+			goto end;
+		}
+	}
+
+	dstContext = outContext = NULL;
+	srcContext= sws_getContext(w, h, PIX_FMT_YUV420P, srcW, srcH, srcFormat, flags, NULL, NULL, NULL);
+	if (srcContext == NULL) {
+		fprintf(stderr, "Failed to get %s ---> %s\n",
+				sws_format_name(PIX_FMT_YUV420P),
+				sws_format_name(srcFormat));
+		res = -1;
+
+		goto end;
+	}
+	dstContext= sws_getContext(srcW, srcH, srcFormat, dstW, dstH, dstFormat, flags, NULL, NULL, NULL);
+	if (dstContext == NULL) {
+		fprintf(stderr, "Failed to get %s ---> %s\n",
+				sws_format_name(srcFormat),
+				sws_format_name(dstFormat));
+		res = -1;
+
+		goto end;
+	}
+	outContext= sws_getContext(dstW, dstH, dstFormat, w, h, PIX_FMT_YUV420P, flags, NULL, NULL, NULL);
+	if (outContext == NULL) {
+		fprintf(stderr, "Failed to get %s ---> %s\n",
+				sws_format_name(dstFormat),
+				sws_format_name(PIX_FMT_YUV420P));
+		res = -1;
+
+		goto end;
+	}
+//	printf("test %X %X %X -> %X %X %X\n", (int)ref[0], (int)ref[1], (int)ref[2],
+//		(int)src[0], (int)src[1], (int)src[2]);
+
+	sws_scale(srcContext, ref, refStride, 0, h   , src, srcStride);
+	sws_scale(dstContext, src, srcStride, 0, srcH, dst, dstStride);
+	sws_scale(outContext, dst, dstStride, 0, dstH, out, refStride);
+
+#if defined(ARCH_X86)
+	asm volatile ("emms\n\t");
+#endif
+	     
+	ssdY= getSSD(ref[0], out[0], refStride[0], refStride[0], w, h);
+	ssdU= getSSD(ref[1], out[1], refStride[1], refStride[1], (w+1)>>1, (h+1)>>1);
+	ssdV= getSSD(ref[2], out[2], refStride[2], refStride[2], (w+1)>>1, (h+1)>>1);
+	
+	if(srcFormat == PIX_FMT_GRAY8 || dstFormat==PIX_FMT_GRAY8) ssdU=ssdV=0; //FIXME check that output is really gray
+	
+	ssdY/= w*h;
+	ssdU/= w*h/4;
+	ssdV/= w*h/4;
+	
+	if(ssdY>100 || ssdU>100 || ssdV>100){
+		printf(" %s %dx%d -> %s %4dx%4d flags=%2d SSD=%5lld,%5lld,%5lld\n", 
+			sws_format_name(srcFormat), srcW, srcH, 
+			sws_format_name(dstFormat), dstW, dstH,
+			flags,
+			ssdY, ssdU, ssdV);
+	}
+
+	end:
+	
+	sws_freeContext(srcContext);
+	sws_freeContext(dstContext);
+	sws_freeContext(outContext);
+
+	for(i=0; i<3; i++){
+		free(src[i]);
+		free(dst[i]);
+		free(out[i]);
+	}
+
+	return res;
+}
+
+void fast_memcpy(void *a, void *b, int s){ //FIXME
+    memcpy(a, b, s);
+}
+
+static void selfTest(uint8_t *src[3], int stride[3], int w, int h){
+	enum PixelFormat srcFormat, dstFormat;
+	int srcW, srcH, dstW, dstH;
+	int flags;
+
+	for(srcFormat = 0; srcFormat < PIX_FMT_NB; srcFormat++) {
+		for(dstFormat = 0; dstFormat < PIX_FMT_NB; dstFormat++) {
+			printf("%s -> %s\n",
+					sws_format_name(srcFormat),
+					sws_format_name(dstFormat));
+ 
+			srcW= w;
+			srcH= h;
+			for(dstW=w - w/3; dstW<= 4*w/3; dstW+= w/3){
+				for(dstH=h - h/3; dstH<= 4*h/3; dstH+= h/3){
+					for(flags=1; flags<33; flags*=2) {
+						int res;
+						
+						res = doTest(src, stride, w, h, srcFormat, dstFormat,
+							srcW, srcH, dstW, dstH, flags);
+						if (res < 0) {
+							dstW = 4 * w / 3;
+							dstH = 4 * h / 3;
+							flags = 33;
+						}
+					}
+				}
+			}
+		}
+	}
+}
+
+#define W 96
+#define H 96
+
+int main(int argc, char **argv){
+	uint8_t rgb_data[W*H*4];
+	uint8_t *rgb_src[3]= {rgb_data, NULL, NULL};
+	int rgb_stride[3]={4*W, 0, 0};
+	uint8_t data[3][W*H];
+	uint8_t *src[3]= {data[0], data[1], data[2]};
+	int stride[3]={W, W, W};
+	int x, y;
+	struct SwsContext *sws;
+
+	sws= sws_getContext(W/12, H/12, PIX_FMT_RGB32, W, H, PIX_FMT_YUV420P, 2, NULL, NULL, NULL);
+        
+	for(y=0; y<H; y++){
+		for(x=0; x<W*4; x++){
+			rgb_data[ x + y*4*W]= random();
+		}
+	}
+#if defined(ARCH_X86)
+	sws_rgb2rgb_init(SWS_CPU_CAPS_MMX*0);
+#else
+	sws_rgb2rgb_init(0);
+#endif
+	sws_scale(sws, rgb_src, rgb_stride, 0, H   , src, stride);
+
+#if defined(ARCH_X86)
+	asm volatile ("emms\n\t");
+#endif
+
+	selfTest(src,  stride, W, H);
+
+        return 123;
+}