1/* 2 * Generates a synthetic YUV video sequence suitable for codec testing. 3 * NOTE: No floats are used to guarantee a bit exact output. 4 * 5 * Copyright (c) 2002 Fabrice Bellard 6 * 7 * This file is part of FFmpeg. 8 * 9 * FFmpeg is free software; you can redistribute it and/or 10 * modify it under the terms of the GNU Lesser General Public 11 * License as published by the Free Software Foundation; either 12 * version 2.1 of the License, or (at your option) any later version. 13 * 14 * FFmpeg is distributed in the hope that it will be useful, 15 * but WITHOUT ANY WARRANTY; without even the implied warranty of 16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 17 * Lesser General Public License for more details. 18 * 19 * You should have received a copy of the GNU Lesser General Public 20 * License along with FFmpeg; if not, write to the Free Software 21 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 22 */ 23 24#include <stdlib.h> 25#include <stdint.h> 26#include <stdio.h> 27 28#define SCALEBITS 8 29#define ONE_HALF (1 << (SCALEBITS - 1)) 30#define FIX(x) ((int) ((x) * (1L<<SCALEBITS) + 0.5)) 31 32static void rgb24_to_yuv420p(uint8_t *lum, uint8_t *cb, uint8_t *cr, 33 uint8_t *src, int width, int height) 34{ 35 int wrap, wrap3, x, y; 36 int r, g, b, r1, g1, b1; 37 uint8_t *p; 38 39 wrap = width; 40 wrap3 = width * 3; 41 p = src; 42 for(y=0;y<height;y+=2) { 43 for(x=0;x<width;x+=2) { 44 r = p[0]; 45 g = p[1]; 46 b = p[2]; 47 r1 = r; 48 g1 = g; 49 b1 = b; 50 lum[0] = (FIX(0.29900) * r + FIX(0.58700) * g + 51 FIX(0.11400) * b + ONE_HALF) >> SCALEBITS; 52 r = p[3]; 53 g = p[4]; 54 b = p[5]; 55 r1 += r; 56 g1 += g; 57 b1 += b; 58 lum[1] = (FIX(0.29900) * r + FIX(0.58700) * g + 59 FIX(0.11400) * b + ONE_HALF) >> SCALEBITS; 60 p += wrap3; 61 lum += wrap; 62 63 r = p[0]; 64 g = p[1]; 65 b = p[2]; 66 r1 += r; 67 g1 += g; 68 b1 += b; 69 lum[0] = (FIX(0.29900) * r + FIX(0.58700) * g + 70 FIX(0.11400) * b + ONE_HALF) >> SCALEBITS; 71 r = p[3]; 72 g = p[4]; 73 b = p[5]; 74 r1 += r; 75 g1 += g; 76 b1 += b; 77 lum[1] = (FIX(0.29900) * r + FIX(0.58700) * g + 78 FIX(0.11400) * b + ONE_HALF) >> SCALEBITS; 79 80 cb[0] = ((- FIX(0.16874) * r1 - FIX(0.33126) * g1 + 81 FIX(0.50000) * b1 + 4 * ONE_HALF - 1) >> (SCALEBITS + 2)) + 128; 82 cr[0] = ((FIX(0.50000) * r1 - FIX(0.41869) * g1 - 83 FIX(0.08131) * b1 + 4 * ONE_HALF - 1) >> (SCALEBITS + 2)) + 128; 84 85 cb++; 86 cr++; 87 p += -wrap3 + 2 * 3; 88 lum += -wrap + 2; 89 } 90 p += wrap3; 91 lum += wrap; 92 } 93} 94 95/* cif format */ 96#define DEFAULT_WIDTH 352 97#define DEFAULT_HEIGHT 288 98#define DEFAULT_NB_PICT 50 /* 2 seconds */ 99 100static void pgmyuv_save(const char *filename, int w, int h, 101 unsigned char *rgb_tab) 102{ 103 FILE *f; 104 int i, h2, w2; 105 unsigned char *cb, *cr; 106 unsigned char *lum_tab, *cb_tab, *cr_tab; 107 108 lum_tab = malloc(w * h); 109 cb_tab = malloc((w * h) / 4); 110 cr_tab = malloc((w * h) / 4); 111 112 rgb24_to_yuv420p(lum_tab, cb_tab, cr_tab, rgb_tab, w, h); 113 114 f = fopen(filename,"wb"); 115 fprintf(f, "P5\n%d %d\n%d\n", w, (h * 3) / 2, 255); 116 fwrite(lum_tab, 1, w * h, f); 117 h2 = h / 2; 118 w2 = w / 2; 119 cb = cb_tab; 120 cr = cr_tab; 121 for(i=0;i<h2;i++) { 122 fwrite(cb, 1, w2, f); 123 fwrite(cr, 1, w2, f); 124 cb += w2; 125 cr += w2; 126 } 127 fclose(f); 128 129 free(lum_tab); 130 free(cb_tab); 131 free(cr_tab); 132} 133 134unsigned char *rgb_tab; 135int width, height, wrap; 136 137static void put_pixel(int x, int y, int r, int g, int b) 138{ 139 unsigned char *p; 140 141 if (x < 0 || x >= width || 142 y < 0 || y >= height) 143 return; 144 145 p = rgb_tab + y * wrap + x * 3; 146 p[0] = r; 147 p[1] = g; 148 p[2] = b; 149} 150 151static unsigned int myrnd(unsigned int *seed_ptr, int n) 152{ 153 unsigned int seed, val; 154 155 seed = *seed_ptr; 156 seed = (seed * 314159) + 1; 157 if (n == 256) { 158 val = seed >> 24; 159 } else { 160 val = seed % n; 161 } 162 *seed_ptr = seed; 163 return val; 164} 165 166#define NOISE_X 10 167#define NOISE_Y 30 168#define NOISE_W 26 169 170#define FRAC_BITS 8 171#define FRAC_ONE (1 << FRAC_BITS) 172 173/* cosine approximate with 1-x^2 */ 174static int int_cos(int a) 175{ 176 int v, neg; 177 a = a & (FRAC_ONE - 1); 178 if (a >= (FRAC_ONE / 2)) 179 a = FRAC_ONE - a; 180 neg = 0; 181 if (a > (FRAC_ONE / 4)) { 182 neg = -1; 183 a = (FRAC_ONE / 2) - a; 184 } 185 v = FRAC_ONE - ((a * a) >> 4); 186 v = (v ^ neg) - neg; 187 return v; 188} 189 190#define NB_OBJS 10 191 192typedef struct VObj { 193 int x, y, w, h; 194 int r, g, b; 195} VObj; 196 197VObj objs[NB_OBJS]; 198 199unsigned int seed = 1; 200 201static void gen_image(int num, int w, int h) 202{ 203 int r, g, b, x, y, i, dx, dy, x1, y1; 204 unsigned int seed1; 205 206 if (num == 0) { 207 for(i=0;i<NB_OBJS;i++) { 208 objs[i].x = myrnd(&seed, w); 209 objs[i].y = myrnd(&seed, h); 210 objs[i].w = myrnd(&seed, w / 4) + 10; 211 objs[i].h = myrnd(&seed, h / 4) + 10; 212 objs[i].r = myrnd(&seed, 256); 213 objs[i].g = myrnd(&seed, 256); 214 objs[i].b = myrnd(&seed, 256); 215 } 216 } 217 218 /* first a moving background with gradients */ 219 /* test motion estimation */ 220 dx = int_cos(num * FRAC_ONE / 50) * 35; 221 dy = int_cos(num * FRAC_ONE / 50 + FRAC_ONE / 10) * 30; 222 for(y=0;y<h;y++) { 223 for(x=0;x<w;x++) { 224 x1 = (x << FRAC_BITS) + dx; 225 y1 = (y << FRAC_BITS) + dx; 226 r = ((y1 * 7) >> FRAC_BITS) & 0xff; 227 g = (((x1 + y1) * 9) >> FRAC_BITS) & 0xff; 228 b = ((x1 * 5) >> FRAC_BITS) & 0xff; 229 put_pixel(x, y, r, g, b); 230 } 231 } 232 233 /* then some noise with very high intensity to test saturation */ 234 seed1 = num; 235 for(y=0;y<NOISE_W;y++) { 236 for(x=0;x<NOISE_W;x++) { 237 r = myrnd(&seed1, 256); 238 g = myrnd(&seed1, 256); 239 b = myrnd(&seed1, 256); 240 put_pixel(x + NOISE_X, y + NOISE_Y, r, g, b); 241 } 242 } 243 244 /* then moving objects */ 245 for(i=0;i<NB_OBJS;i++) { 246 VObj *p = &objs[i]; 247 seed1 = i; 248 for(y=0;y<p->h;y++) { 249 for(x=0;x<p->w;x++) { 250 r = p->r; 251 g = p->g; 252 b = p->b; 253 /* add a per object noise */ 254 r += myrnd(&seed1, 50); 255 g += myrnd(&seed1, 50); 256 b += myrnd(&seed1, 50); 257 put_pixel(x + p->x, y + p->y, r, g, b); 258 } 259 } 260 p->x += myrnd(&seed, 21) - 10; 261 p->y += myrnd(&seed, 21) - 10; 262 } 263} 264 265int main(int argc, char **argv) 266{ 267 int w, h, i; 268 char buf[1024]; 269 270 if (argc != 2) { 271 printf("usage: %s file\n" 272 "generate a test video stream\n", argv[0]); 273 exit(1); 274 } 275 276#if 0 277 for(i=0;i<256;i++) 278 printf("cos(%d)=%d\n", i, int_cos(i)); 279#endif 280 281 w = DEFAULT_WIDTH; 282 h = DEFAULT_HEIGHT; 283 284 rgb_tab = malloc(w * h * 3); 285 wrap = w * 3; 286 width = w; 287 height = h; 288 289 for(i=0;i<DEFAULT_NB_PICT;i++) { 290 snprintf(buf, sizeof(buf), "%s%02d.pgm", argv[1], i); 291 gen_image(i, w, h); 292 pgmyuv_save(buf, w, h, rgb_tab); 293 } 294 295 free(rgb_tab); 296 return 0; 297} 298