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 hasChroma(x)   (!(          \
  41             isGray(x)               \
  42         || (x)==PIX_FMT_MONOBLACK   \
  43         || (x)==PIX_FMT_MONOWHITE   \
  44     ))
  45 #define isALPHA(x)      (           \
  46            (x)==PIX_FMT_BGR32       \
  47         || (x)==PIX_FMT_BGR32_1     \
  48         || (x)==PIX_FMT_RGB32       \
  49         || (x)==PIX_FMT_RGB32_1     \
  50         || (x)==PIX_FMT_YUVA420P    \
  51     )
  52
  53 static uint64_t getSSD(uint8_t *src1, uint8_t *src2, int stride1, int stride2, int w, int h)
  54 {
  55     int x,y;
  56     uint64_t ssd=0;
  57
  58 //printf("%d %d\n", w, h);
  59
  60     for (y=0; y<h; y++) {
  61         for (x=0; x<w; x++) {
  62             int d= src1[x + y*stride1] - src2[x + y*stride2];
  63             ssd+= d*d;
  64 //printf("%d", abs(src1[x + y*stride1] - src2[x + y*stride2])/26 );
  65         }
  66 //printf("\n");
  67     }
  68     return ssd;
  69 }
  70
  71 // test by ref -> src -> dst -> out & compare out against ref
  72 // ref & out are YV12
  73 static int doTest(uint8_t *ref[4], int refStride[4], int w, int h, int srcFormat, int dstFormat,
  74                   int srcW, int srcH, int dstW, int dstH, int flags)
  75 {
  76     uint8_t *src[4] = {0};
  77     uint8_t *dst[4] = {0};
  78     uint8_t *out[4] = {0};
  79     int srcStride[4], dstStride[4];
  80     int i;
  81     uint64_t ssdY, ssdU=0, ssdV=0, ssdA=0;
  82     struct SwsContext *srcContext = NULL, *dstContext = NULL,
  83                       *outContext = NULL;
  84     int res;
  85
  86     res = 0;
  87     for (i=0; i<4; i++) {
  88         // avoid stride % bpp != 0
  89         if (srcFormat==PIX_FMT_RGB24 || srcFormat==PIX_FMT_BGR24)
  90             srcStride[i]= srcW*3;
  91         else if (srcFormat==PIX_FMT_RGB48BE || srcFormat==PIX_FMT_RGB48LE)
  92             srcStride[i]= srcW*6;
  93         else
  94             srcStride[i]= srcW*4;
  95
  96         if (dstFormat==PIX_FMT_RGB24 || dstFormat==PIX_FMT_BGR24)
  97             dstStride[i]= dstW*3;
  98         else if (dstFormat==PIX_FMT_RGB48BE || dstFormat==PIX_FMT_RGB48LE)
  99             dstStride[i]= dstW*6;
 100         else
 101             dstStride[i]= dstW*4;
 102
 103         src[i]= malloc(srcStride[i]*srcH);
 104         dst[i]= malloc(dstStride[i]*dstH);
 105         out[i]= malloc(refStride[i]*h);
 106         if (!src[i] || !dst[i] || !out[i]) {
 107             perror("Malloc");
 108             res = -1;
 109
 110             goto end;
 111         }
 112     }
 113
 114     srcContext= sws_getContext(w, h, PIX_FMT_YUVA420P, srcW, srcH, srcFormat, flags, NULL, NULL, NULL);
 115     if (!srcContext) {
 116         fprintf(stderr, "Failed to get %s ---> %s\n",
 117                 sws_format_name(PIX_FMT_YUVA420P),
 118                 sws_format_name(srcFormat));
 119         res = -1;
 120
 121         goto end;
 122     }
 123     dstContext= sws_getContext(srcW, srcH, srcFormat, dstW, dstH, dstFormat, flags, NULL, NULL, NULL);
 124     if (!dstContext) {
 125         fprintf(stderr, "Failed to get %s ---> %s\n",
 126                 sws_format_name(srcFormat),
 127                 sws_format_name(dstFormat));
 128         res = -1;
 129
 130         goto end;
 131     }
 132     outContext= sws_getContext(dstW, dstH, dstFormat, w, h, PIX_FMT_YUVA420P, flags, NULL, NULL, NULL);
 133     if (!outContext) {
 134         fprintf(stderr, "Failed to get %s ---> %s\n",
 135                 sws_format_name(dstFormat),
 136                 sws_format_name(PIX_FMT_YUVA420P));
 137         res = -1;
 138
 139         goto end;
 140     }
 141 //    printf("test %X %X %X -> %X %X %X\n", (int)ref[0], (int)ref[1], (int)ref[2],
 142 //        (int)src[0], (int)src[1], (int)src[2]);
 143
 144     sws_scale(srcContext, ref, refStride, 0, h   , src, srcStride);
 145     sws_scale(dstContext, src, srcStride, 0, srcH, dst, dstStride);
 146     sws_scale(outContext, dst, dstStride, 0, dstH, out, refStride);
 147
 148     ssdY= getSSD(ref[0], out[0], refStride[0], refStride[0], w, h);
 149     if (hasChroma(srcFormat) && hasChroma(dstFormat)) {
 150         //FIXME check that output is really gray
 151         ssdU= getSSD(ref[1], out[1], refStride[1], refStride[1], (w+1)>>1, (h+1)>>1);
 152         ssdV= getSSD(ref[2], out[2], refStride[2], refStride[2], (w+1)>>1, (h+1)>>1);
 153     }
 154     if (isALPHA(srcFormat) && isALPHA(dstFormat))
 155         ssdA= getSSD(ref[3], out[3], refStride[3], refStride[3], w, h);
 156
 157     ssdY/= w*h;
 158     ssdU/= w*h/4;
 159     ssdV/= w*h/4;
 160     ssdA/= w*h;
 161
 162     printf(" %s %dx%d -> %s %4dx%4d flags=%2d SSD=%5"PRId64",%5"PRId64",%5"PRId64",%5"PRId64"\n",
 163            sws_format_name(srcFormat), srcW, srcH,
 164            sws_format_name(dstFormat), dstW, dstH,
 165            flags, ssdY, ssdU, ssdV, ssdA);
 166     fflush(stdout);
 167
 168 end:
 169
 170     sws_freeContext(srcContext);
 171     sws_freeContext(dstContext);
 172     sws_freeContext(outContext);
 173
 174     for (i=0; i<4; i++) {
 175         free(src[i]);
 176         free(dst[i]);
 177         free(out[i]);
 178     }
 179
 180     return res;
 181 }
 182
 183 static void selfTest(uint8_t *ref[4], int refStride[4], int w, int h)
 184 {
 185     const int flags[] = { SWS_FAST_BILINEAR,
 186                           SWS_BILINEAR, SWS_BICUBIC,
 187                           SWS_X       , SWS_POINT  , SWS_AREA, 0 };
 188     const int srcW = w;
 189     const int srcH = h;
 190     const int dstW[] = { srcW - srcW/3, srcW, srcW + srcW/3, 0 };
 191     const int dstH[] = { srcH - srcH/3, srcH, srcH + srcH/3, 0 };
 192     enum PixelFormat srcFormat, dstFormat;
 193
 194     for (srcFormat = 0; srcFormat < PIX_FMT_NB; srcFormat++) {
 195         for (dstFormat = 0; dstFormat < PIX_FMT_NB; dstFormat++) {
 196             int i, j, k;
 197             int res = 0;
 198
 199             printf("%s -> %s\n",
 200                    sws_format_name(srcFormat),
 201                    sws_format_name(dstFormat));
 202             fflush(stdout);
 203
 204             for (i = 0; dstW[i] && !res; i++)
 205                 for (j = 0; dstH[j] && !res; j++)
 206                     for (k = 0; flags[k] && !res; k++)
 207                         res = doTest(ref, refStride, w, h, srcFormat, dstFormat,
 208                                      srcW, srcH, dstW[i], dstH[j], flags[k]);
 209         }
 210     }
 211 }
 212
 213 #define W 96
 214 #define H 96
 215
 216 int main(int argc, char **argv)
 217 {
 218     uint8_t *rgb_data = malloc (W*H*4);
 219     uint8_t *rgb_src[3]= {rgb_data, NULL, NULL};
 220     int rgb_stride[3]={4*W, 0, 0};
 221     uint8_t *data = malloc (4*W*H);
 222     uint8_t *src[4]= {data, data+W*H, data+W*H*2, data+W*H*3};
 223     int stride[4]={W, W, W, W};
 224     int x, y;
 225     struct SwsContext *sws;
 226     AVLFG rand;
 227
 228     if (!rgb_data || !data)
 229         return -1;
 230
 231     sws= sws_getContext(W/12, H/12, PIX_FMT_RGB32, W, H, PIX_FMT_YUVA420P, SWS_BILINEAR, NULL, NULL, NULL);
 232
 233     av_lfg_init(&rand, 1);
 234
 235     for (y=0; y<H; y++) {
 236         for (x=0; x<W*4; x++) {
 237             rgb_data[ x + y*4*W]= av_lfg_get(&rand);
 238         }
 239     }
 240     sws_scale(sws, rgb_src, rgb_stride, 0, H, src, stride);
 241     sws_freeContext(sws);
 242     free(rgb_data);
 243
 244     selfTest(src, stride, W, H);
 245     free(data);
 246
 247     return 0;
 248 }