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 "libavutil/lfg.h"
  30 #include "swscale.h"
  31 #include "swscale_internal.h"
  32
  33 static uint64_t getSSD(uint8_t *src1, uint8_t *src2, int stride1, int stride2, int w, int h){
  34     int x,y;
  35     uint64_t ssd=0;
  36
  37 //printf("%d %d\n", w, h);
  38
  39     for (y=0; y<h; y++){
  40         for (x=0; x<w; x++){
  41             int d= src1[x + y*stride1] - src2[x + y*stride2];
  42             ssd+= d*d;
  43 //printf("%d", abs(src1[x + y*stride1] - src2[x + y*stride2])/26 );
  44         }
  45 //printf("\n");
  46     }
  47     return ssd;
  48 }
  49
  50 // test by ref -> src -> dst -> out & compare out against ref
  51 // ref & out are YV12
  52 static int doTest(uint8_t *ref[4], int refStride[4], int w, int h, int srcFormat, int dstFormat,
  53                   int srcW, int srcH, int dstW, int dstH, int flags){
  54     uint8_t *src[4] = {0};
  55     uint8_t *dst[4] = {0};
  56     uint8_t *out[4] = {0};
  57     int srcStride[4], dstStride[4];
  58     int i;
  59     uint64_t ssdY, ssdU, ssdV, ssdA=0;
  60     struct SwsContext *srcContext = NULL, *dstContext = NULL,
  61                       *outContext = NULL;
  62     int res;
  63
  64     res = 0;
  65     for (i=0; i<4; i++){
  66         // avoid stride % bpp != 0
  67         if (srcFormat==PIX_FMT_RGB24 || srcFormat==PIX_FMT_BGR24)
  68             srcStride[i]= srcW*3;
  69         else
  70             srcStride[i]= srcW*4;
  71
  72         if (dstFormat==PIX_FMT_RGB24 || dstFormat==PIX_FMT_BGR24)
  73             dstStride[i]= dstW*3;
  74         else
  75             dstStride[i]= dstW*4;
  76
  77         src[i]= (uint8_t*) malloc(srcStride[i]*srcH);
  78         dst[i]= (uint8_t*) malloc(dstStride[i]*dstH);
  79         out[i]= (uint8_t*) malloc(refStride[i]*h);
  80         if (!src[i] || !dst[i] || !out[i]) {
  81             perror("Malloc");
  82             res = -1;
  83
  84             goto end;
  85         }
  86     }
  87
  88     srcContext= sws_getContext(w, h, PIX_FMT_YUVA420P, srcW, srcH, srcFormat, flags, NULL, NULL, NULL);
  89     if (!srcContext) {
  90         fprintf(stderr, "Failed to get %s ---> %s\n",
  91                 sws_format_name(PIX_FMT_YUVA420P),
  92                 sws_format_name(srcFormat));
  93         res = -1;
  94
  95         goto end;
  96     }
  97     dstContext= sws_getContext(srcW, srcH, srcFormat, dstW, dstH, dstFormat, flags, NULL, NULL, NULL);
  98     if (!dstContext) {
  99         fprintf(stderr, "Failed to get %s ---> %s\n",
 100                 sws_format_name(srcFormat),
 101                 sws_format_name(dstFormat));
 102         res = -1;
 103
 104         goto end;
 105     }
 106     outContext= sws_getContext(dstW, dstH, dstFormat, w, h, PIX_FMT_YUVA420P, flags, NULL, NULL, NULL);
 107     if (!outContext) {
 108         fprintf(stderr, "Failed to get %s ---> %s\n",
 109                 sws_format_name(dstFormat),
 110                 sws_format_name(PIX_FMT_YUVA420P));
 111         res = -1;
 112
 113         goto end;
 114     }
 115 //    printf("test %X %X %X -> %X %X %X\n", (int)ref[0], (int)ref[1], (int)ref[2],
 116 //        (int)src[0], (int)src[1], (int)src[2]);
 117
 118     sws_scale(srcContext, ref, refStride, 0, h   , src, srcStride);
 119     sws_scale(dstContext, src, srcStride, 0, srcH, dst, dstStride);
 120     sws_scale(outContext, dst, dstStride, 0, dstH, out, refStride);
 121
 122     ssdY= getSSD(ref[0], out[0], refStride[0], refStride[0], w, h);
 123     ssdU= getSSD(ref[1], out[1], refStride[1], refStride[1], (w+1)>>1, (h+1)>>1);
 124     ssdV= getSSD(ref[2], out[2], refStride[2], refStride[2], (w+1)>>1, (h+1)>>1);
 125     if (isALPHA(srcFormat) && isALPHA(dstFormat))
 126         ssdA= getSSD(ref[3], out[3], refStride[3], refStride[3], w, h);
 127
 128     if (srcFormat == PIX_FMT_GRAY8 || dstFormat==PIX_FMT_GRAY8) ssdU=ssdV=0; //FIXME check that output is really gray
 129
 130     ssdY/= w*h;
 131     ssdU/= w*h/4;
 132     ssdV/= w*h/4;
 133     ssdA/= w*h;
 134
 135     printf(" %s %dx%d -> %s %4dx%4d flags=%2d SSD=%5"PRId64",%5"PRId64",%5"PRId64",%5"PRId64"\n",
 136            sws_format_name(srcFormat), srcW, srcH,
 137            sws_format_name(dstFormat), dstW, dstH,
 138            flags, ssdY, ssdU, ssdV, ssdA);
 139     fflush(stdout);
 140
 141     end:
 142
 143     sws_freeContext(srcContext);
 144     sws_freeContext(dstContext);
 145     sws_freeContext(outContext);
 146
 147     for (i=0; i<4; i++){
 148         free(src[i]);
 149         free(dst[i]);
 150         free(out[i]);
 151     }
 152
 153     return res;
 154 }
 155
 156 static void selfTest(uint8_t *src[4], int stride[4], int w, int h){
 157     enum PixelFormat srcFormat, dstFormat;
 158     int srcW, srcH, dstW, dstH;
 159     int flags;
 160
 161     for (srcFormat = 0; srcFormat < PIX_FMT_NB; srcFormat++) {
 162         for (dstFormat = 0; dstFormat < PIX_FMT_NB; dstFormat++) {
 163             printf("%s -> %s\n",
 164                    sws_format_name(srcFormat),
 165                    sws_format_name(dstFormat));
 166             fflush(stdout);
 167
 168             srcW= w;
 169             srcH= h;
 170             for (dstW=w - w/3; dstW<= 4*w/3; dstW+= w/3){
 171                 for (dstH=h - h/3; dstH<= 4*h/3; dstH+= h/3){
 172                     for (flags=1; flags<33; flags*=2) {
 173                         int res;
 174
 175                         res = doTest(src, stride, w, h, srcFormat, dstFormat,
 176                                      srcW, srcH, dstW, dstH, flags);
 177                         if (res < 0) {
 178                             dstW = 4 * w / 3;
 179                             dstH = 4 * h / 3;
 180                             flags = 33;
 181                         }
 182                     }
 183                 }
 184             }
 185         }
 186     }
 187 }
 188
 189 #define W 96
 190 #define H 96
 191
 192 int main(int argc, char **argv){
 193     uint8_t *rgb_data = malloc (W*H*4);
 194     uint8_t *rgb_src[3]= {rgb_data, NULL, NULL};
 195     int rgb_stride[3]={4*W, 0, 0};
 196     uint8_t *data = malloc (4*W*H);
 197     uint8_t *src[4]= {data, data+W*H, data+W*H*2, data+W*H*3};
 198     int stride[4]={W, W, W, W};
 199     int x, y;
 200     struct SwsContext *sws;
 201     AVLFG rand;
 202
 203     sws= sws_getContext(W/12, H/12, PIX_FMT_RGB32, W, H, PIX_FMT_YUVA420P, 2, NULL, NULL, NULL);
 204
 205     av_lfg_init(&rand, 1);
 206
 207     for (y=0; y<H; y++){
 208         for (x=0; x<W*4; x++){
 209             rgb_data[ x + y*4*W]= av_lfg_get(&rand);
 210         }
 211     }
 212     sws_scale(sws, rgb_src, rgb_stride, 0, H, src, stride);
 213
 214     selfTest(src, stride, W, H);
 215
 216     return 123;
 217 }