libswscale/swscale-example.c

   1 /*
   2  * Copyright (C) 2003 Michael Niedermayer <michaelni@gmx.at>
   3  *
   4  * This file is part of FFmpeg.
   5  *
   6  * FFmpeg is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * FFmpeg is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with FFmpeg; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  19  */
  20
  21 #include <stdio.h>
  22 #include <stdlib.h>
  23 #include <string.h>
  24 #include <inttypes.h>
  25 #include <stdarg.h>
  26
  27 #undef HAVE_AV_CONFIG_H
  28 #include "libavutil/avutil.h"
  29 #include "swscale.h"
  30 #include "swscale_internal.h"
  31
  32 static uint64_t getSSD(uint8_t *src1, uint8_t *src2, int stride1, int stride2, int w, int h){
  33     int x,y;
  34     uint64_t ssd=0;
  35
  36 //printf("%d %d\n", w, h);
  37
  38     for (y=0; y<h; y++){
  39         for (x=0; x<w; x++){
  40             int d= src1[x + y*stride1] - src2[x + y*stride2];
  41             ssd+= d*d;
  42 //printf("%d", abs(src1[x + y*stride1] - src2[x + y*stride2])/26 );
  43         }
  44 //printf("\n");
  45     }
  46     return ssd;
  47 }
  48
  49 // test by ref -> src -> dst -> out & compare out against ref
  50 // ref & out are YV12
  51 static int doTest(uint8_t *ref[3], int refStride[3], int w, int h, int srcFormat, int dstFormat,
  52                   int srcW, int srcH, int dstW, int dstH, int flags){
  53     uint8_t *src[3];
  54     uint8_t *dst[3];
  55     uint8_t *out[3];
  56     int srcStride[3], dstStride[3];
  57     int i;
  58     uint64_t ssdY, ssdU, ssdV;
  59     struct SwsContext *srcContext, *dstContext, *outContext;
  60     int res;
  61
  62     res = 0;
  63     for (i=0; i<3; i++){
  64         // avoid stride % bpp != 0
  65         if (srcFormat==PIX_FMT_RGB24 || srcFormat==PIX_FMT_BGR24)
  66             srcStride[i]= srcW*3;
  67         else
  68             srcStride[i]= srcW*4;
  69
  70         if (dstFormat==PIX_FMT_RGB24 || dstFormat==PIX_FMT_BGR24)
  71             dstStride[i]= dstW*3;
  72         else
  73             dstStride[i]= dstW*4;
  74
  75         src[i]= (uint8_t*) malloc(srcStride[i]*srcH);
  76         dst[i]= (uint8_t*) malloc(dstStride[i]*dstH);
  77         out[i]= (uint8_t*) malloc(refStride[i]*h);
  78         if (!src[i] || !dst[i] || !out[i]) {
  79             perror("Malloc");
  80             res = -1;
  81
  82             goto end;
  83         }
  84     }
  85
  86     dstContext = outContext = NULL;
  87     srcContext= sws_getContext(w, h, PIX_FMT_YUV420P, srcW, srcH, srcFormat, flags, NULL, NULL, NULL);
  88     if (!srcContext) {
  89         fprintf(stderr, "Failed to get %s ---> %s\n",
  90                 sws_format_name(PIX_FMT_YUV420P),
  91                 sws_format_name(srcFormat));
  92         res = -1;
  93
  94         goto end;
  95     }
  96     dstContext= sws_getContext(srcW, srcH, srcFormat, dstW, dstH, dstFormat, flags, NULL, NULL, NULL);
  97     if (!dstContext) {
  98         fprintf(stderr, "Failed to get %s ---> %s\n",
  99                 sws_format_name(srcFormat),
 100                 sws_format_name(dstFormat));
 101         res = -1;
 102
 103         goto end;
 104     }
 105     outContext= sws_getContext(dstW, dstH, dstFormat, w, h, PIX_FMT_YUV420P, flags, NULL, NULL, NULL);
 106     if (!outContext) {
 107         fprintf(stderr, "Failed to get %s ---> %s\n",
 108                 sws_format_name(dstFormat),
 109                 sws_format_name(PIX_FMT_YUV420P));
 110         res = -1;
 111
 112         goto end;
 113     }
 114 //    printf("test %X %X %X -> %X %X %X\n", (int)ref[0], (int)ref[1], (int)ref[2],
 115 //        (int)src[0], (int)src[1], (int)src[2]);
 116
 117     sws_scale(srcContext, ref, refStride, 0, h   , src, srcStride);
 118     sws_scale(dstContext, src, srcStride, 0, srcH, dst, dstStride);
 119     sws_scale(outContext, dst, dstStride, 0, dstH, out, refStride);
 120
 121     ssdY= getSSD(ref[0], out[0], refStride[0], refStride[0], w, h);
 122     ssdU= getSSD(ref[1], out[1], refStride[1], refStride[1], (w+1)>>1, (h+1)>>1);
 123     ssdV= getSSD(ref[2], out[2], refStride[2], refStride[2], (w+1)>>1, (h+1)>>1);
 124
 125     if (srcFormat == PIX_FMT_GRAY8 || dstFormat==PIX_FMT_GRAY8) ssdU=ssdV=0; //FIXME check that output is really gray
 126
 127     ssdY/= w*h;
 128     ssdU/= w*h/4;
 129     ssdV/= w*h/4;
 130
 131     printf(" %s %dx%d -> %s %4dx%4d flags=%2d SSD=%5lld,%5lld,%5lld\n",
 132            sws_format_name(srcFormat), srcW, srcH,
 133            sws_format_name(dstFormat), dstW, dstH,
 134            flags, ssdY, ssdU, ssdV);
 135     fflush(stdout);
 136
 137     end:
 138
 139     sws_freeContext(srcContext);
 140     sws_freeContext(dstContext);
 141     sws_freeContext(outContext);
 142
 143     for (i=0; i<3; i++){
 144         free(src[i]);
 145         free(dst[i]);
 146         free(out[i]);
 147     }
 148
 149     return res;
 150 }
 151
 152 static void selfTest(uint8_t *src[3], int stride[3], int w, int h){
 153     enum PixelFormat srcFormat, dstFormat;
 154     int srcW, srcH, dstW, dstH;
 155     int flags;
 156
 157     for (srcFormat = 0; srcFormat < PIX_FMT_NB; srcFormat++) {
 158         for (dstFormat = 0; dstFormat < PIX_FMT_NB; dstFormat++) {
 159             printf("%s -> %s\n",
 160                    sws_format_name(srcFormat),
 161                    sws_format_name(dstFormat));
 162             fflush(stdout);
 163
 164             srcW= w;
 165             srcH= h;
 166             for (dstW=w - w/3; dstW<= 4*w/3; dstW+= w/3){
 167                 for (dstH=h - h/3; dstH<= 4*h/3; dstH+= h/3){
 168                     for (flags=1; flags<33; flags*=2) {
 169                         int res;
 170
 171                         res = doTest(src, stride, w, h, srcFormat, dstFormat,
 172                                      srcW, srcH, dstW, dstH, flags);
 173                         if (res < 0) {
 174                             dstW = 4 * w / 3;
 175                             dstH = 4 * h / 3;
 176                             flags = 33;
 177                         }
 178                     }
 179                 }
 180             }
 181         }
 182     }
 183 }
 184
 185 #define W 96
 186 #define H 96
 187
 188 int main(int argc, char **argv){
 189     uint8_t *rgb_data = malloc (W*H*4);
 190     uint8_t *rgb_src[3]= {rgb_data, NULL, NULL};
 191     int rgb_stride[3]={4*W, 0, 0};
 192     uint8_t *data = malloc (3*W*H);
 193     uint8_t *src[3]= {data, data+W*H, data+W*H*2};
 194     int stride[3]={W, W, W};
 195     int x, y;
 196     struct SwsContext *sws;
 197
 198     sws= sws_getContext(W/12, H/12, PIX_FMT_RGB32, W, H, PIX_FMT_YUV420P, 2, NULL, NULL, NULL);
 199
 200     for (y=0; y<H; y++){
 201         for (x=0; x<W*4; x++){
 202             rgb_data[ x + y*4*W]= random();
 203         }
 204     }
 205     sws_scale(sws, rgb_src, rgb_stride, 0, H, src, stride);
 206
 207     selfTest(src, stride, W, H);
 208
 209     return 123;
 210 }