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
  32 /* HACK Duplicated from swscale_internal.h.
  33  * Should be removed when a cleaner pixel format system exists. */
  34 const char *sws_format_name(enum PixelFormat format);
  35 #define isGray(x)       (           \
  36            (x)==PIX_FMT_GRAY8       \
  37         || (x)==PIX_FMT_GRAY16BE    \
  38         || (x)==PIX_FMT_GRAY16LE    \
  39     )
  40 #define isALPHA(x)      (           \
  41            (x)==PIX_FMT_BGR32       \
  42         || (x)==PIX_FMT_BGR32_1     \
  43         || (x)==PIX_FMT_RGB32       \
  44         || (x)==PIX_FMT_RGB32_1     \
  45         || (x)==PIX_FMT_YUVA420P    \
  46     )
  47
  48 static uint64_t getSSD(uint8_t *src1, uint8_t *src2, int stride1, int stride2, int w, int h){
  49     int x,y;
  50     uint64_t ssd=0;
  51
  52 //printf("%d %d\n", w, h);
  53
  54     for (y=0; y<h; y++){
  55         for (x=0; x<w; x++){
  56             int d= src1[x + y*stride1] - src2[x + y*stride2];
  57             ssd+= d*d;
  58 //printf("%d", abs(src1[x + y*stride1] - src2[x + y*stride2])/26 );
  59         }
  60 //printf("\n");
  61     }
  62     return ssd;
  63 }
  64
  65 // test by ref -> src -> dst -> out & compare out against ref
  66 // ref & out are YV12
  67 static int doTest(uint8_t *ref[4], int refStride[4], int w, int h, int srcFormat, int dstFormat,
  68                   int srcW, int srcH, int dstW, int dstH, int flags){
  69     uint8_t *src[4] = {0};
  70     uint8_t *dst[4] = {0};
  71     uint8_t *out[4] = {0};
  72     int srcStride[4], dstStride[4];
  73     int i;
  74     uint64_t ssdY, ssdU=0, ssdV=0, ssdA=0;
  75     struct SwsContext *srcContext = NULL, *dstContext = NULL,
  76                       *outContext = NULL;
  77     int res;
  78
  79     res = 0;
  80     for (i=0; i<4; i++){
  81         // avoid stride % bpp != 0
  82         if (srcFormat==PIX_FMT_RGB24 || srcFormat==PIX_FMT_BGR24)
  83             srcStride[i]= srcW*3;
  84         else if (srcFormat==PIX_FMT_RGB48BE || srcFormat==PIX_FMT_RGB48LE)
  85             srcStride[i]= srcW*6;
  86         else
  87             srcStride[i]= srcW*4;
  88
  89         if (dstFormat==PIX_FMT_RGB24 || dstFormat==PIX_FMT_BGR24)
  90             dstStride[i]= dstW*3;
  91         else if (dstFormat==PIX_FMT_RGB48BE || dstFormat==PIX_FMT_RGB48LE)
  92             dstStride[i]= dstW*6;
  93         else
  94             dstStride[i]= dstW*4;
  95
  96         src[i]= (uint8_t*) malloc(srcStride[i]*srcH);
  97         dst[i]= (uint8_t*) malloc(dstStride[i]*dstH);
  98         out[i]= (uint8_t*) malloc(refStride[i]*h);
  99         if (!src[i] || !dst[i] || !out[i]) {
 100             perror("Malloc");
 101             res = -1;
 102
 103             goto end;
 104         }
 105     }
 106
 107     srcContext= sws_getContext(w, h, PIX_FMT_YUVA420P, srcW, srcH, srcFormat, flags, NULL, NULL, NULL);
 108     if (!srcContext) {
 109         fprintf(stderr, "Failed to get %s ---> %s\n",
 110                 sws_format_name(PIX_FMT_YUVA420P),
 111                 sws_format_name(srcFormat));
 112         res = -1;
 113
 114         goto end;
 115     }
 116     dstContext= sws_getContext(srcW, srcH, srcFormat, dstW, dstH, dstFormat, flags, NULL, NULL, NULL);
 117     if (!dstContext) {
 118         fprintf(stderr, "Failed to get %s ---> %s\n",
 119                 sws_format_name(srcFormat),
 120                 sws_format_name(dstFormat));
 121         res = -1;
 122
 123         goto end;
 124     }
 125     outContext= sws_getContext(dstW, dstH, dstFormat, w, h, PIX_FMT_YUVA420P, flags, NULL, NULL, NULL);
 126     if (!outContext) {
 127         fprintf(stderr, "Failed to get %s ---> %s\n",
 128                 sws_format_name(dstFormat),
 129                 sws_format_name(PIX_FMT_YUVA420P));
 130         res = -1;
 131
 132         goto end;
 133     }
 134 //    printf("test %X %X %X -> %X %X %X\n", (int)ref[0], (int)ref[1], (int)ref[2],
 135 //        (int)src[0], (int)src[1], (int)src[2]);
 136
 137     sws_scale(srcContext, ref, refStride, 0, h   , src, srcStride);
 138     sws_scale(dstContext, src, srcStride, 0, srcH, dst, dstStride);
 139     sws_scale(outContext, dst, dstStride, 0, dstH, out, refStride);
 140
 141     ssdY= getSSD(ref[0], out[0], refStride[0], refStride[0], w, h);
 142     if (!isGray(srcFormat) && !isGray(dstFormat)) {
 143         //FIXME check that output is really gray
 144     ssdU= getSSD(ref[1], out[1], refStride[1], refStride[1], (w+1)>>1, (h+1)>>1);
 145     ssdV= getSSD(ref[2], out[2], refStride[2], refStride[2], (w+1)>>1, (h+1)>>1);
 146     }
 147     if (isALPHA(srcFormat) && isALPHA(dstFormat))
 148         ssdA= getSSD(ref[3], out[3], refStride[3], refStride[3], w, h);
 149
 150     ssdY/= w*h;
 151     ssdU/= w*h/4;
 152     ssdV/= w*h/4;
 153     ssdA/= w*h;
 154
 155     printf(" %s %dx%d -> %s %4dx%4d flags=%2d SSD=%5"PRId64",%5"PRId64",%5"PRId64",%5"PRId64"\n",
 156            sws_format_name(srcFormat), srcW, srcH,
 157            sws_format_name(dstFormat), dstW, dstH,
 158            flags, ssdY, ssdU, ssdV, ssdA);
 159     fflush(stdout);
 160
 161     end:
 162
 163     sws_freeContext(srcContext);
 164     sws_freeContext(dstContext);
 165     sws_freeContext(outContext);
 166
 167     for (i=0; i<4; i++){
 168         free(src[i]);
 169         free(dst[i]);
 170         free(out[i]);
 171     }
 172
 173     return res;
 174 }
 175
 176 static void selfTest(uint8_t *src[4], int stride[4], int w, int h){
 177     enum PixelFormat srcFormat, dstFormat;
 178     int srcW, srcH, dstW, dstH;
 179     int flags;
 180
 181     for (srcFormat = 0; srcFormat < PIX_FMT_NB; srcFormat++) {
 182         for (dstFormat = 0; dstFormat < PIX_FMT_NB; dstFormat++) {
 183             printf("%s -> %s\n",
 184                    sws_format_name(srcFormat),
 185                    sws_format_name(dstFormat));
 186             fflush(stdout);
 187
 188             srcW= w;
 189             srcH= h;
 190             for (dstW=w - w/3; dstW<= 4*w/3; dstW+= w/3){
 191                 for (dstH=h - h/3; dstH<= 4*h/3; dstH+= h/3){
 192                     for (flags=1; flags<33; flags*=2) {
 193                         int res;
 194
 195                         res = doTest(src, stride, w, h, srcFormat, dstFormat,
 196                                      srcW, srcH, dstW, dstH, flags);
 197                         if (res < 0) {
 198                             dstW = 4 * w / 3;
 199                             dstH = 4 * h / 3;
 200                             flags = 33;
 201                         }
 202                     }
 203                 }
 204             }
 205         }
 206     }
 207 }
 208
 209 #define W 96
 210 #define H 96
 211
 212 int main(int argc, char **argv){
 213     uint8_t *rgb_data = malloc (W*H*4);
 214     uint8_t *rgb_src[3]= {rgb_data, NULL, NULL};
 215     int rgb_stride[3]={4*W, 0, 0};
 216     uint8_t *data = malloc (4*W*H);
 217     uint8_t *src[4]= {data, data+W*H, data+W*H*2, data+W*H*3};
 218     int stride[4]={W, W, W, W};
 219     int x, y;
 220     struct SwsContext *sws;
 221     AVLFG rand;
 222
 223     sws= sws_getContext(W/12, H/12, PIX_FMT_RGB32, W, H, PIX_FMT_YUVA420P, 2, NULL, NULL, NULL);
 224
 225     av_lfg_init(&rand, 1);
 226
 227     for (y=0; y<H; y++){
 228         for (x=0; x<W*4; x++){
 229             rgb_data[ x + y*4*W]= av_lfg_get(&rand);
 230         }
 231     }
 232     sws_scale(sws, rgb_src, rgb_stride, 0, H, src, stride);
 233
 234     selfTest(src, stride, W, H);
 235
 236     return 0;
 237 }