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libswscale/swscale-example.c

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00001 /*
00002  * Copyright (C) 2003 Michael Niedermayer <michaelni@gmx.at>
00003  *
00004  * This file is part of FFmpeg.
00005  *
00006  * FFmpeg is free software; you can redistribute it and/or
00007  * modify it under the terms of the GNU Lesser General Public
00008  * License as published by the Free Software Foundation; either
00009  * version 2.1 of the License, or (at your option) any later version.
00010  *
00011  * FFmpeg is distributed in the hope that it will be useful,
00012  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00013  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00014  * Lesser General Public License for more details.
00015  *
00016  * You should have received a copy of the GNU Lesser General Public
00017  * License along with FFmpeg; if not, write to the Free Software
00018  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00019  */
00020 
00021 #include <stdio.h>
00022 #include <stdlib.h>
00023 #include <string.h>
00024 #include <inttypes.h>
00025 #include <stdarg.h>
00026 
00027 #undef HAVE_AV_CONFIG_H
00028 #include "libavutil/avutil.h"
00029 #include "swscale.h"
00030 #include "swscale_internal.h"
00031 
00032 static uint64_t getSSD(uint8_t *src1, uint8_t *src2, int stride1, int stride2, int w, int h){
00033     int x,y;
00034     uint64_t ssd=0;
00035 
00036 //printf("%d %d\n", w, h);
00037 
00038     for (y=0; y<h; y++){
00039         for (x=0; x<w; x++){
00040             int d= src1[x + y*stride1] - src2[x + y*stride2];
00041             ssd+= d*d;
00042 //printf("%d", abs(src1[x + y*stride1] - src2[x + y*stride2])/26 );
00043         }
00044 //printf("\n");
00045     }
00046     return ssd;
00047 }
00048 
00049 // test by ref -> src -> dst -> out & compare out against ref
00050 // ref & out are YV12
00051 static int doTest(uint8_t *ref[3], int refStride[3], int w, int h, int srcFormat, int dstFormat,
00052                   int srcW, int srcH, int dstW, int dstH, int flags){
00053     uint8_t *src[3];
00054     uint8_t *dst[3];
00055     uint8_t *out[3];
00056     int srcStride[3], dstStride[3];
00057     int i;
00058     uint64_t ssdY, ssdU, ssdV;
00059     struct SwsContext *srcContext, *dstContext, *outContext;
00060     int res;
00061 
00062     res = 0;
00063     for (i=0; i<3; i++){
00064         // avoid stride % bpp != 0
00065         if (srcFormat==PIX_FMT_RGB24 || srcFormat==PIX_FMT_BGR24)
00066             srcStride[i]= srcW*3;
00067         else
00068             srcStride[i]= srcW*4;
00069 
00070         if (dstFormat==PIX_FMT_RGB24 || dstFormat==PIX_FMT_BGR24)
00071             dstStride[i]= dstW*3;
00072         else
00073             dstStride[i]= dstW*4;
00074 
00075         src[i]= (uint8_t*) malloc(srcStride[i]*srcH);
00076         dst[i]= (uint8_t*) malloc(dstStride[i]*dstH);
00077         out[i]= (uint8_t*) malloc(refStride[i]*h);
00078         if (!src[i] || !dst[i] || !out[i]) {
00079             perror("Malloc");
00080             res = -1;
00081 
00082             goto end;
00083         }
00084     }
00085 
00086     dstContext = outContext = NULL;
00087     srcContext= sws_getContext(w, h, PIX_FMT_YUV420P, srcW, srcH, srcFormat, flags, NULL, NULL, NULL);
00088     if (!srcContext) {
00089         fprintf(stderr, "Failed to get %s ---> %s\n",
00090                 sws_format_name(PIX_FMT_YUV420P),
00091                 sws_format_name(srcFormat));
00092         res = -1;
00093 
00094         goto end;
00095     }
00096     dstContext= sws_getContext(srcW, srcH, srcFormat, dstW, dstH, dstFormat, flags, NULL, NULL, NULL);
00097     if (!dstContext) {
00098         fprintf(stderr, "Failed to get %s ---> %s\n",
00099                 sws_format_name(srcFormat),
00100                 sws_format_name(dstFormat));
00101         res = -1;
00102 
00103         goto end;
00104     }
00105     outContext= sws_getContext(dstW, dstH, dstFormat, w, h, PIX_FMT_YUV420P, flags, NULL, NULL, NULL);
00106     if (!outContext) {
00107         fprintf(stderr, "Failed to get %s ---> %s\n",
00108                 sws_format_name(dstFormat),
00109                 sws_format_name(PIX_FMT_YUV420P));
00110         res = -1;
00111 
00112         goto end;
00113     }
00114 //    printf("test %X %X %X -> %X %X %X\n", (int)ref[0], (int)ref[1], (int)ref[2],
00115 //        (int)src[0], (int)src[1], (int)src[2]);
00116 
00117     sws_scale(srcContext, ref, refStride, 0, h   , src, srcStride);
00118     sws_scale(dstContext, src, srcStride, 0, srcH, dst, dstStride);
00119     sws_scale(outContext, dst, dstStride, 0, dstH, out, refStride);
00120 
00121     ssdY= getSSD(ref[0], out[0], refStride[0], refStride[0], w, h);
00122     ssdU= getSSD(ref[1], out[1], refStride[1], refStride[1], (w+1)>>1, (h+1)>>1);
00123     ssdV= getSSD(ref[2], out[2], refStride[2], refStride[2], (w+1)>>1, (h+1)>>1);
00124 
00125     if (srcFormat == PIX_FMT_GRAY8 || dstFormat==PIX_FMT_GRAY8) ssdU=ssdV=0; //FIXME check that output is really gray
00126 
00127     ssdY/= w*h;
00128     ssdU/= w*h/4;
00129     ssdV/= w*h/4;
00130 
00131     printf(" %s %dx%d -> %s %4dx%4d flags=%2d SSD=%5lld,%5lld,%5lld\n",
00132            sws_format_name(srcFormat), srcW, srcH,
00133            sws_format_name(dstFormat), dstW, dstH,
00134            flags, ssdY, ssdU, ssdV);
00135     fflush(stdout);
00136 
00137     end:
00138 
00139     sws_freeContext(srcContext);
00140     sws_freeContext(dstContext);
00141     sws_freeContext(outContext);
00142 
00143     for (i=0; i<3; i++){
00144         free(src[i]);
00145         free(dst[i]);
00146         free(out[i]);
00147     }
00148 
00149     return res;
00150 }
00151 
00152 static void selfTest(uint8_t *src[3], int stride[3], int w, int h){
00153     enum PixelFormat srcFormat, dstFormat;
00154     int srcW, srcH, dstW, dstH;
00155     int flags;
00156 
00157     for (srcFormat = 0; srcFormat < PIX_FMT_NB; srcFormat++) {
00158         for (dstFormat = 0; dstFormat < PIX_FMT_NB; dstFormat++) {
00159             printf("%s -> %s\n",
00160                    sws_format_name(srcFormat),
00161                    sws_format_name(dstFormat));
00162             fflush(stdout);
00163 
00164             srcW= w;
00165             srcH= h;
00166             for (dstW=w - w/3; dstW<= 4*w/3; dstW+= w/3){
00167                 for (dstH=h - h/3; dstH<= 4*h/3; dstH+= h/3){
00168                     for (flags=1; flags<33; flags*=2) {
00169                         int res;
00170 
00171                         res = doTest(src, stride, w, h, srcFormat, dstFormat,
00172                                      srcW, srcH, dstW, dstH, flags);
00173                         if (res < 0) {
00174                             dstW = 4 * w / 3;
00175                             dstH = 4 * h / 3;
00176                             flags = 33;
00177                         }
00178                     }
00179                 }
00180             }
00181         }
00182     }
00183 }
00184 
00185 #define W 96
00186 #define H 96
00187 
00188 int main(int argc, char **argv){
00189     uint8_t *rgb_data = malloc (W*H*4);
00190     uint8_t *rgb_src[3]= {rgb_data, NULL, NULL};
00191     int rgb_stride[3]={4*W, 0, 0};
00192     uint8_t *data = malloc (3*W*H);
00193     uint8_t *src[3]= {data, data+W*H, data+W*H*2};
00194     int stride[3]={W, W, W};
00195     int x, y;
00196     struct SwsContext *sws;
00197 
00198     sws= sws_getContext(W/12, H/12, PIX_FMT_RGB32, W, H, PIX_FMT_YUV420P, 2, NULL, NULL, NULL);
00199 
00200     for (y=0; y<H; y++){
00201         for (x=0; x<W*4; x++){
00202             rgb_data[ x + y*4*W]= random();
00203         }
00204     }
00205     sws_scale(sws, rgb_src, rgb_stride, 0, H, src, stride);
00206 
00207     selfTest(src, stride, W, H);
00208 
00209     return 123;
00210 }

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