2 * Generates a synthetic YUV video sequence suitable for codec testing.
3 * NOTE: No floats are used to guarantee a bit exact output.
5 * Copyright (c) 2002 Fabrice Bellard
7 * This file is part of Libav.
9 * Libav 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.
14 * Libav 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.
19 * You should have received a copy of the GNU Lesser General Public
20 * License along with Libav; if not, write to the Free Software
21 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
29 #define ONE_HALF (1 << (SCALEBITS - 1))
30 #define FIX(x) ((int) ((x) * (1L<<SCALEBITS) + 0.5))
32 static void rgb24_to_yuv420p(uint8_t *lum, uint8_t *cb, uint8_t *cr,
33 uint8_t *src, int width, int height)
35 int wrap, wrap3, x, y;
36 int r, g, b, r1, g1, b1;
42 for(y=0;y<height;y+=2) {
43 for(x=0;x<width;x+=2) {
50 lum[0] = (FIX(0.29900) * r + FIX(0.58700) * g +
51 FIX(0.11400) * b + ONE_HALF) >> SCALEBITS;
58 lum[1] = (FIX(0.29900) * r + FIX(0.58700) * g +
59 FIX(0.11400) * b + ONE_HALF) >> SCALEBITS;
69 lum[0] = (FIX(0.29900) * r + FIX(0.58700) * g +
70 FIX(0.11400) * b + ONE_HALF) >> SCALEBITS;
77 lum[1] = (FIX(0.29900) * r + FIX(0.58700) * g +
78 FIX(0.11400) * b + ONE_HALF) >> SCALEBITS;
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;
96 #define DEFAULT_WIDTH 352
97 #define DEFAULT_HEIGHT 288
98 #define DEFAULT_NB_PICT 50 /* 2 seconds */
100 static void pgmyuv_save(const char *filename, int w, int h,
101 unsigned char *rgb_tab)
105 unsigned char *cb, *cr;
106 unsigned char *lum_tab, *cb_tab, *cr_tab;
108 lum_tab = malloc(w * h);
109 cb_tab = malloc((w * h) / 4);
110 cr_tab = malloc((w * h) / 4);
112 rgb24_to_yuv420p(lum_tab, cb_tab, cr_tab, rgb_tab, w, h);
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);
122 fwrite(cb, 1, w2, f);
123 fwrite(cr, 1, w2, f);
134 unsigned char *rgb_tab;
135 int width, height, wrap;
137 static void put_pixel(int x, int y, int r, int g, int b)
141 if (x < 0 || x >= width ||
142 y < 0 || y >= height)
145 p = rgb_tab + y * wrap + x * 3;
151 static unsigned int myrnd(unsigned int *seed_ptr, int n)
153 unsigned int seed, val;
156 seed = (seed * 314159) + 1;
171 #define FRAC_ONE (1 << FRAC_BITS)
173 /* cosine approximate with 1-x^2 */
174 static int int_cos(int a)
177 a = a & (FRAC_ONE - 1);
178 if (a >= (FRAC_ONE / 2))
181 if (a > (FRAC_ONE / 4)) {
183 a = (FRAC_ONE / 2) - a;
185 v = FRAC_ONE - ((a * a) >> 4);
192 typedef struct VObj {
199 unsigned int seed = 1;
201 static void gen_image(int num, int w, int h)
203 int r, g, b, x, y, i, dx, dy, x1, y1;
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);
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;
224 x1 = (x << FRAC_BITS) + dx;
225 y1 = (y << FRAC_BITS) + dy;
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);
233 /* then some noise with very high intensity to test saturation */
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);
244 /* then moving objects */
245 for(i=0;i<NB_OBJS;i++) {
248 for(y=0;y<p->h;y++) {
249 for(x=0;x<p->w;x++) {
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);
260 p->x += myrnd(&seed, 21) - 10;
261 p->y += myrnd(&seed, 21) - 10;
265 int main(int argc, char **argv)
271 printf("usage: %s file\n"
272 "generate a test video stream\n", argv[0]);
279 rgb_tab = malloc(w * h * 3);
284 for(i=0;i<DEFAULT_NB_PICT;i++) {
285 snprintf(buf, sizeof(buf), "%s%02d.pgm", argv[1], i);
287 pgmyuv_save(buf, w, h, rgb_tab);