tests/rotozoom.c

   1 /*
   2  * Generates a synthetic YUV video sequence suitable for codec testing.
   3  *
   4  * copyright (c) Sebastien Bechet <s.bechet@av7.net>
   5  *
   6  * This file is part of FFmpeg.
   7  *
   8  * FFmpeg is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU Lesser General Public
  10  * License as published by the Free Software Foundation; either
  11  * version 2.1 of the License, or (at your option) any later version.
  12  *
  13  * FFmpeg is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * Lesser General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU Lesser General Public
  19  * License along with FFmpeg; if not, write to the Free Software
  20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  21  */
  22
  23 #include <stdlib.h>
  24 #include <stdio.h>
  25 #include <inttypes.h>
  26
  27 #define FIXP (1<<16)
  28 #define MY_PI 205887 //(M_PI*FIX)
  29
  30 static int64_t int_pow(int64_t a, int p){
  31     int64_t v= FIXP;
  32
  33     for(; p; p--){
  34         v*= a;
  35         v/= FIXP;
  36     }
  37
  38     return v;
  39 }
  40
  41 static int64_t int_sin(int64_t a){
  42     if(a<0) a= MY_PI-a; // 0..inf
  43     a %= 2*MY_PI;       // 0..2PI
  44
  45     if(a>=MY_PI*3/2) a -= 2*MY_PI;  // -PI/2 .. 3PI/2
  46     if(a>=MY_PI/2  ) a = MY_PI - a; // -PI/2 ..  PI/2
  47
  48     return a - int_pow(a, 3)/6 + int_pow(a, 5)/120 - int_pow(a, 7)/5040;
  49 }
  50
  51 #define SCALEBITS 8
  52 #define ONE_HALF  (1 << (SCALEBITS - 1))
  53 #define FIX(x)    ((int) ((x) * (1L<<SCALEBITS) + 0.5))
  54 typedef unsigned char UINT8;
  55
  56 static void rgb24_to_yuv420p(UINT8 *lum, UINT8 *cb, UINT8 *cr,
  57                               UINT8 *src, int width, int height)
  58 {
  59     int wrap, wrap3, x, y;
  60     int r, g, b, r1, g1, b1;
  61     UINT8 *p;
  62
  63     wrap = width;
  64     wrap3 = width * 3;
  65     p = src;
  66     for(y=0;y<height;y+=2) {
  67         for(x=0;x<width;x+=2) {
  68             r = p[0];
  69             g = p[1];
  70             b = p[2];
  71             r1 = r;
  72             g1 = g;
  73             b1 = b;
  74             lum[0] = (FIX(0.29900) * r + FIX(0.58700) * g +
  75                       FIX(0.11400) * b + ONE_HALF) >> SCALEBITS;
  76             r = p[3];
  77             g = p[4];
  78             b = p[5];
  79             r1 += r;
  80             g1 += g;
  81             b1 += b;
  82             lum[1] = (FIX(0.29900) * r + FIX(0.58700) * g +
  83                       FIX(0.11400) * b + ONE_HALF) >> SCALEBITS;
  84             p += wrap3;
  85             lum += wrap;
  86
  87             r = p[0];
  88             g = p[1];
  89             b = p[2];
  90             r1 += r;
  91             g1 += g;
  92             b1 += b;
  93             lum[0] = (FIX(0.29900) * r + FIX(0.58700) * g +
  94                       FIX(0.11400) * b + ONE_HALF) >> SCALEBITS;
  95             r = p[3];
  96             g = p[4];
  97             b = p[5];
  98             r1 += r;
  99             g1 += g;
 100             b1 += b;
 101             lum[1] = (FIX(0.29900) * r + FIX(0.58700) * g +
 102                       FIX(0.11400) * b + ONE_HALF) >> SCALEBITS;
 103
 104             cb[0] = ((- FIX(0.16874) * r1 - FIX(0.33126) * g1 +
 105                       FIX(0.50000) * b1 + 4 * ONE_HALF - 1) >> (SCALEBITS + 2)) + 128;
 106             cr[0] = ((FIX(0.50000) * r1 - FIX(0.41869) * g1 -
 107                      FIX(0.08131) * b1 + 4 * ONE_HALF - 1) >> (SCALEBITS + 2)) + 128;
 108
 109             cb++;
 110             cr++;
 111             p += -wrap3 + 2 * 3;
 112             lum += -wrap + 2;
 113         }
 114         p += wrap3;
 115         lum += wrap;
 116     }
 117 }
 118
 119 /* cif format */
 120 #define DEFAULT_WIDTH   352
 121 #define DEFAULT_HEIGHT  288
 122 #define DEFAULT_NB_PICT 50
 123
 124 static void pgmyuv_save(const char *filename, int w, int h,
 125                         unsigned char *rgb_tab)
 126 {
 127     FILE *f;
 128     int i, h2, w2;
 129     unsigned char *cb, *cr;
 130     unsigned char *lum_tab, *cb_tab, *cr_tab;
 131
 132     lum_tab = malloc(w * h);
 133     cb_tab = malloc((w * h) / 4);
 134     cr_tab = malloc((w * h) / 4);
 135
 136     rgb24_to_yuv420p(lum_tab, cb_tab, cr_tab, rgb_tab, w, h);
 137
 138     f = fopen(filename,"wb");
 139     fprintf(f, "P5\n%d %d\n%d\n", w, (h * 3) / 2, 255);
 140     fwrite(lum_tab, 1, w * h, f);
 141     h2 = h / 2;
 142     w2 = w / 2;
 143     cb = cb_tab;
 144     cr = cr_tab;
 145     for(i=0;i<h2;i++) {
 146         fwrite(cb, 1, w2, f);
 147         fwrite(cr, 1, w2, f);
 148         cb += w2;
 149         cr += w2;
 150     }
 151     fclose(f);
 152
 153     free(lum_tab);
 154     free(cb_tab);
 155     free(cr_tab);
 156 }
 157
 158 unsigned char *rgb_tab;
 159 int width, height, wrap;
 160
 161 static void put_pixel(int x, int y, int r, int g, int b)
 162 {
 163     unsigned char *p;
 164
 165     if (x < 0 || x >= width ||
 166         y < 0 || y >= height)
 167         return;
 168
 169     p = rgb_tab + y * wrap + x * 3;
 170     p[0] = r;
 171     p[1] = g;
 172     p[2] = b;
 173 }
 174
 175 unsigned char tab_r[256*256];
 176 unsigned char tab_g[256*256];
 177 unsigned char tab_b[256*256];
 178
 179 int teta = 0;
 180 int h_cos [360];
 181 int h_sin [360];
 182
 183 static int ipol(uint8_t *src, int x, int y){
 184     int int_x= x>>16;
 185     int int_y= y>>16;
 186     int frac_x= x&0xFFFF;
 187     int frac_y= y&0xFFFF;
 188     int s00= src[ ( int_x   &255) + 256*( int_y   &255) ];
 189     int s01= src[ ((int_x+1)&255) + 256*( int_y   &255) ];
 190     int s10= src[ ( int_x   &255) + 256*((int_y+1)&255) ];
 191     int s11= src[ ((int_x+1)&255) + 256*((int_y+1)&255) ];
 192     int s0= (((1<<16) - frac_x)*s00 + frac_x*s01)>>8;
 193     int s1= (((1<<16) - frac_x)*s10 + frac_x*s11)>>8;
 194
 195     return (((1<<16) - frac_y)*s0 + frac_y*s1)>>24;
 196 }
 197
 198 static void gen_image(int num, int w, int h)
 199 {
 200   const int c = h_cos [teta];
 201   const int s = h_sin [teta];
 202
 203   const int xi = -(w/2) * c;
 204   const int yi =  (w/2) * s;
 205
 206   const int xj = -(h/2) * s;
 207   const int yj = -(h/2) * c;
 208   int i,j;
 209
 210   int x,y;
 211   int xprime = xj;
 212   int yprime = yj;
 213
 214
 215   for (j=0;j<h;j++) {
 216
 217     x = xprime + xi + FIXP*w/2;
 218     xprime += s;
 219
 220     y = yprime + yi + FIXP*h/2;
 221     yprime += c;
 222
 223     for ( i=0 ; i<w ; i++ ) {
 224       x += c;
 225       y -= s;
 226 #if 1
 227       put_pixel(i, j, ipol(tab_r, x, y), ipol(tab_g, x, y), ipol(tab_b, x, y));
 228 #else
 229       {
 230           unsigned dep;
 231           dep = ((x>>16)&255) + (((y>>16)&255)<<8);
 232           put_pixel(i, j, tab_r[dep], tab_g[dep], tab_b[dep]);
 233       }
 234 #endif
 235     }
 236   }
 237   teta = (teta+1) % 360;
 238 }
 239
 240 #define W 256
 241 #define H 256
 242
 243 static void init_demo(const char *filename) {
 244   int i,j;
 245   int h;
 246   int radian;
 247   char line[3 * W];
 248
 249   FILE *fichier;
 250
 251   fichier = fopen(filename,"rb");
 252   if (!fichier) {
 253       perror(filename);
 254       exit(1);
 255   }
 256
 257   fread(line, 1, 15, fichier);
 258   for (i=0;i<H;i++) {
 259     fread(line,1,3*W,fichier);
 260     for (j=0;j<W;j++) {
 261           tab_r[W*i+j] = line[3*j    ];
 262           tab_g[W*i+j] = line[3*j + 1];
 263           tab_b[W*i+j] = line[3*j + 2];
 264     }
 265   }
 266   fclose(fichier);
 267
 268   /* tables sin/cos */
 269   for (i=0;i<360;i++) {
 270     radian = 2*i*MY_PI/360;
 271     h = 2*FIXP + int_sin (radian);
 272     h_cos[i] = ( h * int_sin (radian + MY_PI/2) )/2/FIXP;
 273     h_sin[i] = ( h * int_sin (radian          ) )/2/FIXP;
 274   }
 275 }
 276
 277 int main(int argc, char **argv)
 278 {
 279     int w, h, i;
 280     char buf[1024];
 281
 282     if (argc != 3) {
 283         printf("usage: %s directory/ image.pnm\n"
 284                "generate a test video stream\n", argv[0]);
 285         exit(1);
 286     }
 287
 288     w = DEFAULT_WIDTH;
 289     h = DEFAULT_HEIGHT;
 290
 291     rgb_tab = malloc(w * h * 3);
 292     wrap = w * 3;
 293     width = w;
 294     height = h;
 295
 296     init_demo(argv[2]);
 297
 298     for(i=0;i<DEFAULT_NB_PICT;i++) {
 299         snprintf(buf, sizeof(buf), "%s%02d.pgm", argv[1], i);
 300         gen_image(i, w, h);
 301         pgmyuv_save(buf, w, h, rgb_tab);
 302     }
 303
 304     free(rgb_tab);
 305     return 0;
 306 }