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/mem.h"
  29 #include "libavutil/avutil.h"
  30 #include "libavutil/lfg.h"
  31 #include "swscale.h"
  32
  33 /* HACK Duplicated from swscale_internal.h.
  34  * Should be removed when a cleaner pixel format system exists. */
  35 const char *sws_format_name(enum PixelFormat format);
  36 #define isGray(x)       (           \
  37            (x)==PIX_FMT_GRAY8       \
  38         || (x)==PIX_FMT_GRAY16BE    \
  39         || (x)==PIX_FMT_GRAY16LE    \
  40     )
  41 #define hasChroma(x)   (!(          \
  42             isGray(x)               \
  43         || (x)==PIX_FMT_MONOBLACK   \
  44         || (x)==PIX_FMT_MONOWHITE   \
  45     ))
  46 #define isALPHA(x)      (           \
  47            (x)==PIX_FMT_BGR32       \
  48         || (x)==PIX_FMT_BGR32_1     \
  49         || (x)==PIX_FMT_RGB32       \
  50         || (x)==PIX_FMT_RGB32_1     \
  51         || (x)==PIX_FMT_YUVA420P    \
  52     )
  53
  54 static uint64_t getSSD(uint8_t *src1, uint8_t *src2, int stride1, int stride2, int w, int h)
  55 {
  56     int x,y;
  57     uint64_t ssd=0;
  58
  59 //printf("%d %d\n", w, h);
  60
  61     for (y=0; y<h; y++) {
  62         for (x=0; x<w; x++) {
  63             int d= src1[x + y*stride1] - src2[x + y*stride2];
  64             ssd+= d*d;
  65 //printf("%d", abs(src1[x + y*stride1] - src2[x + y*stride2])/26 );
  66         }
  67 //printf("\n");
  68     }
  69     return ssd;
  70 }
  71
  72 // test by ref -> src -> dst -> out & compare out against ref
  73 // ref & out are YV12
  74 static int doTest(uint8_t *ref[4], int refStride[4], int w, int h,
  75                   enum PixelFormat srcFormat, enum PixelFormat dstFormat,
  76                   int srcW, int srcH, int dstW, int dstH, int flags)
  77 {
  78     uint8_t *src[4] = {0};
  79     uint8_t *dst[4] = {0};
  80     uint8_t *out[4] = {0};
  81     int srcStride[4], dstStride[4];
  82     int i;
  83     uint64_t ssdY, ssdU=0, ssdV=0, ssdA=0;
  84     struct SwsContext *srcContext = NULL, *dstContext = NULL,
  85                       *outContext = NULL;
  86     int res;
  87
  88     res = 0;
  89     for (i=0; i<4; i++) {
  90         // avoid stride % bpp != 0
  91         if (srcFormat==PIX_FMT_RGB24 || srcFormat==PIX_FMT_BGR24)
  92             srcStride[i]= srcW*3;
  93         else if (srcFormat==PIX_FMT_RGB48BE || srcFormat==PIX_FMT_RGB48LE)
  94             srcStride[i]= srcW*6;
  95         else
  96             srcStride[i]= srcW*4;
  97
  98         if (dstFormat==PIX_FMT_RGB24 || dstFormat==PIX_FMT_BGR24)
  99             dstStride[i]= dstW*3;
 100         else if (dstFormat==PIX_FMT_RGB48BE || dstFormat==PIX_FMT_RGB48LE)
 101             dstStride[i]= dstW*6;
 102         else
 103             dstStride[i]= dstW*4;
 104
 105         /* Image buffers passed into libswscale can be allocated any way you
 106          * prefer, as long as they're aligned enough for the architecture, and
 107          * they're freed appropriately (such as using av_free for buffers
 108          * allocated with av_malloc). */
 109         src[i]= av_malloc(srcStride[i]*srcH);
 110         dst[i]= av_malloc(dstStride[i]*dstH);
 111         out[i]= av_malloc(refStride[i]*h);
 112         if (!src[i] || !dst[i] || !out[i]) {
 113             perror("Malloc");
 114             res = -1;
 115
 116             goto end;
 117         }
 118     }
 119
 120     srcContext= sws_getContext(w, h, PIX_FMT_YUVA420P, srcW, srcH, srcFormat, flags, NULL, NULL, NULL);
 121     if (!srcContext) {
 122         fprintf(stderr, "Failed to get %s ---> %s\n",
 123                 sws_format_name(PIX_FMT_YUVA420P),
 124                 sws_format_name(srcFormat));
 125         res = -1;
 126
 127         goto end;
 128     }
 129     dstContext= sws_getContext(srcW, srcH, srcFormat, dstW, dstH, dstFormat, flags, NULL, NULL, NULL);
 130     if (!dstContext) {
 131         fprintf(stderr, "Failed to get %s ---> %s\n",
 132                 sws_format_name(srcFormat),
 133                 sws_format_name(dstFormat));
 134         res = -1;
 135
 136         goto end;
 137     }
 138     outContext= sws_getContext(dstW, dstH, dstFormat, w, h, PIX_FMT_YUVA420P, flags, NULL, NULL, NULL);
 139     if (!outContext) {
 140         fprintf(stderr, "Failed to get %s ---> %s\n",
 141                 sws_format_name(dstFormat),
 142                 sws_format_name(PIX_FMT_YUVA420P));
 143         res = -1;
 144
 145         goto end;
 146     }
 147 //    printf("test %X %X %X -> %X %X %X\n", (int)ref[0], (int)ref[1], (int)ref[2],
 148 //        (int)src[0], (int)src[1], (int)src[2]);
 149
 150     sws_scale(srcContext, ref, refStride, 0, h   , src, srcStride);
 151     sws_scale(dstContext, src, srcStride, 0, srcH, dst, dstStride);
 152     sws_scale(outContext, dst, dstStride, 0, dstH, out, refStride);
 153
 154     ssdY= getSSD(ref[0], out[0], refStride[0], refStride[0], w, h);
 155     if (hasChroma(srcFormat) && hasChroma(dstFormat)) {
 156         //FIXME check that output is really gray
 157         ssdU= getSSD(ref[1], out[1], refStride[1], refStride[1], (w+1)>>1, (h+1)>>1);
 158         ssdV= getSSD(ref[2], out[2], refStride[2], refStride[2], (w+1)>>1, (h+1)>>1);
 159     }
 160     if (isALPHA(srcFormat) && isALPHA(dstFormat))
 161         ssdA= getSSD(ref[3], out[3], refStride[3], refStride[3], w, h);
 162
 163     ssdY/= w*h;
 164     ssdU/= w*h/4;
 165     ssdV/= w*h/4;
 166     ssdA/= w*h;
 167
 168     printf(" %s %dx%d -> %s %4dx%4d flags=%2d SSD=%5"PRId64",%5"PRId64",%5"PRId64",%5"PRId64"\n",
 169            sws_format_name(srcFormat), srcW, srcH,
 170            sws_format_name(dstFormat), dstW, dstH,
 171            flags, ssdY, ssdU, ssdV, ssdA);
 172     fflush(stdout);
 173
 174 end:
 175
 176     sws_freeContext(srcContext);
 177     sws_freeContext(dstContext);
 178     sws_freeContext(outContext);
 179
 180     for (i=0; i<4; i++) {
 181         av_free(src[i]);
 182         av_free(dst[i]);
 183         av_free(out[i]);
 184     }
 185
 186     return res;
 187 }
 188
 189 static void selfTest(uint8_t *ref[4], int refStride[4], int w, int h)
 190 {
 191     const int flags[] = { SWS_FAST_BILINEAR,
 192                           SWS_BILINEAR, SWS_BICUBIC,
 193                           SWS_X       , SWS_POINT  , SWS_AREA, 0 };
 194     const int srcW = w;
 195     const int srcH = h;
 196     const int dstW[] = { srcW - srcW/3, srcW, srcW + srcW/3, 0 };
 197     const int dstH[] = { srcH - srcH/3, srcH, srcH + srcH/3, 0 };
 198     enum PixelFormat srcFormat, dstFormat;
 199
 200     for (srcFormat = 0; srcFormat < PIX_FMT_NB; srcFormat++) {
 201         if (!sws_isSupportedInput(srcFormat) || !sws_isSupportedOutput(srcFormat))
 202             continue;
 203
 204         for (dstFormat = 0; dstFormat < PIX_FMT_NB; dstFormat++) {
 205             int i, j, k;
 206             int res = 0;
 207
 208             if (!sws_isSupportedInput(dstFormat) || !sws_isSupportedOutput(dstFormat))
 209                 continue;
 210
 211             printf("%s -> %s\n",
 212                    sws_format_name(srcFormat),
 213                    sws_format_name(dstFormat));
 214             fflush(stdout);
 215
 216             for (i = 0; dstW[i] && !res; i++)
 217                 for (j = 0; dstH[j] && !res; j++)
 218                     for (k = 0; flags[k] && !res; k++)
 219                         res = doTest(ref, refStride, w, h, srcFormat, dstFormat,
 220                                      srcW, srcH, dstW[i], dstH[j], flags[k]);
 221         }
 222     }
 223 }
 224
 225 #define W 96
 226 #define H 96
 227
 228 int main(int argc, char **argv)
 229 {
 230     uint8_t *rgb_data = av_malloc (W*H*4);
 231     uint8_t *rgb_src[3]= {rgb_data, NULL, NULL};
 232     int rgb_stride[3]={4*W, 0, 0};
 233     uint8_t *data = av_malloc (4*W*H);
 234     uint8_t *src[4]= {data, data+W*H, data+W*H*2, data+W*H*3};
 235     int stride[4]={W, W, W, W};
 236     int x, y;
 237     struct SwsContext *sws;
 238     AVLFG rand;
 239
 240     if (!rgb_data || !data)
 241         return -1;
 242
 243     sws= sws_getContext(W/12, H/12, PIX_FMT_RGB32, W, H, PIX_FMT_YUVA420P, SWS_BILINEAR, NULL, NULL, NULL);
 244
 245     av_lfg_init(&rand, 1);
 246
 247     for (y=0; y<H; y++) {
 248         for (x=0; x<W*4; x++) {
 249             rgb_data[ x + y*4*W]= av_lfg_get(&rand);
 250         }
 251     }
 252     sws_scale(sws, rgb_src, rgb_stride, 0, H, src, stride);
 253     sws_freeContext(sws);
 254     av_free(rgb_data);
 255
 256     selfTest(src, stride, W, H);
 257     av_free(data);
 258
 259     return 0;
 260 }