2 * Generate a synthetic YUV video sequence suitable for codec testing.
3 * NOTE: No floats are used to guarantee bitexact output.
5 * Copyright (c) 2002 Fabrice Bellard
7 * This file is part of FFmpeg.
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.
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.
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
30 static unsigned int myrnd(unsigned int *seed_ptr, int n)
32 unsigned int seed, val;
35 seed = (seed * 314159) + 1;
50 #define FRAC_ONE (1 << FRAC_BITS)
52 /* cosine approximate with 1-x^2 */
53 static int int_cos(int a)
56 a = a & (FRAC_ONE - 1);
57 if (a >= (FRAC_ONE / 2))
60 if (a > (FRAC_ONE / 4)) {
62 a = (FRAC_ONE / 2) - a;
64 v = FRAC_ONE - ((a * a) >> 4);
76 static VObj objs[NB_OBJS];
78 static unsigned int seed = 1;
80 static void gen_image(int num, int w, int h)
82 int r, g, b, x, y, i, dx, dy, x1, y1;
86 for (i = 0; i < NB_OBJS; i++) {
87 objs[i].x = myrnd(&seed, w);
88 objs[i].y = myrnd(&seed, h);
89 objs[i].w = myrnd(&seed, w / 4) + 10;
90 objs[i].h = myrnd(&seed, h / 4) + 10;
91 objs[i].r = myrnd(&seed, 256);
92 objs[i].g = myrnd(&seed, 256);
93 objs[i].b = myrnd(&seed, 256);
97 /* first a moving background with gradients */
98 /* test motion estimation */
99 dx = int_cos(num * FRAC_ONE / 50) * 35;
100 dy = int_cos(num * FRAC_ONE / 50 + FRAC_ONE / 10) * 30;
101 for (y = 0; y < h; y++) {
102 for (x = 0; x < w; x++) {
103 x1 = (x << FRAC_BITS) + dx;
104 y1 = (y << FRAC_BITS) + dy;
105 r = ((y1 * 7) >> FRAC_BITS) & 0xff;
106 g = (((x1 + y1) * 9) >> FRAC_BITS) & 0xff;
107 b = ((x1 * 5) >> FRAC_BITS) & 0xff;
108 put_pixel(x, y, r, g, b);
112 /* then some noise with very high intensity to test saturation */
114 for (y = 0; y < NOISE_W; y++) {
115 for (x = 0; x < NOISE_W; x++) {
116 r = myrnd(&seed1, 256);
117 g = myrnd(&seed1, 256);
118 b = myrnd(&seed1, 256);
119 put_pixel(x + NOISE_X, y + NOISE_Y, r, g, b);
123 /* then moving objects */
124 for (i = 0; i < NB_OBJS; i++) {
127 for (y = 0; y < p->h; y++) {
128 for (x = 0; x < p->w; x++) {
132 /* add a per object noise */
133 r += myrnd(&seed1, 50);
134 g += myrnd(&seed1, 50);
135 b += myrnd(&seed1, 50);
136 put_pixel(x + p->x, y + p->y, r, g, b);
139 p->x += myrnd(&seed, 21) - 10;
140 p->y += myrnd(&seed, 21) - 10;
144 void print_help(const char* name)
146 printf("usage: %s file|dir [w=%i] [h=%i]\n"
147 "generate a test video stream\n",
148 name, DEFAULT_WIDTH, DEFAULT_HEIGHT);
152 int main(int argc, char **argv)
158 if (argc < 2 || argc > 4) {
162 if (!freopen(argv[1], "wb", stdout))
168 if (w < 1) print_help(argv[0]);
173 if (h < 1) print_help(argv[0]);
176 rgb_tab = malloc(w * h * 3);
181 for (i = 0; i < DEFAULT_NB_PICT; i++) {
184 snprintf(buf, sizeof(buf), "%s%02d.pgm", argv[1], i);
185 pgmyuv_save(buf, w, h, rgb_tab);
187 pgmyuv_save(NULL, w, h, rgb_tab);