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![Mans Rullgard](/assets/img/avatar_default.png)
A number of systems do not implement freopen() with a NULL filename correctly. This changes these programs to output individual images if opening a named output argument as a file fails, in this case assuming it is a directory. Signed-off-by: Mans Rullgard <mans@mansr.com>
180 lines
4.5 KiB
C
180 lines
4.5 KiB
C
/*
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* Generate a synthetic YUV video sequence suitable for codec testing.
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* NOTE: No floats are used to guarantee bitexact output.
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*
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* Copyright (c) 2002 Fabrice Bellard
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*
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* This file is part of Libav.
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*
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* Libav is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* Libav is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with Libav; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <stdlib.h>
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#include <stdint.h>
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#include <stdio.h>
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#include "utils.c"
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static unsigned int myrnd(unsigned int *seed_ptr, int n)
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{
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unsigned int seed, val;
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seed = *seed_ptr;
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seed = (seed * 314159) + 1;
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if (n == 256) {
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val = seed >> 24;
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} else {
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val = seed % n;
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}
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*seed_ptr = seed;
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return val;
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}
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#define NOISE_X 10
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#define NOISE_Y 30
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#define NOISE_W 26
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#define FRAC_BITS 8
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#define FRAC_ONE (1 << FRAC_BITS)
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/* cosine approximate with 1-x^2 */
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static int int_cos(int a)
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{
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int v, neg;
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a = a & (FRAC_ONE - 1);
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if (a >= (FRAC_ONE / 2))
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a = FRAC_ONE - a;
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neg = 0;
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if (a > (FRAC_ONE / 4)) {
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neg = -1;
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a = (FRAC_ONE / 2) - a;
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}
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v = FRAC_ONE - ((a * a) >> 4);
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v = (v ^ neg) - neg;
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return v;
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}
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#define NB_OBJS 10
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typedef struct VObj {
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int x, y, w, h;
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int r, g, b;
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} VObj;
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static VObj objs[NB_OBJS];
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static unsigned int seed = 1;
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static void gen_image(int num, int w, int h)
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{
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int r, g, b, x, y, i, dx, dy, x1, y1;
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unsigned int seed1;
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if (num == 0) {
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for (i = 0; i < NB_OBJS; i++) {
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objs[i].x = myrnd(&seed, w);
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objs[i].y = myrnd(&seed, h);
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objs[i].w = myrnd(&seed, w / 4) + 10;
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objs[i].h = myrnd(&seed, h / 4) + 10;
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objs[i].r = myrnd(&seed, 256);
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objs[i].g = myrnd(&seed, 256);
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objs[i].b = myrnd(&seed, 256);
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}
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}
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/* first a moving background with gradients */
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/* test motion estimation */
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dx = int_cos(num * FRAC_ONE / 50) * 35;
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dy = int_cos(num * FRAC_ONE / 50 + FRAC_ONE / 10) * 30;
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for (y = 0; y < h; y++) {
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for (x = 0; x < w; x++) {
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x1 = (x << FRAC_BITS) + dx;
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y1 = (y << FRAC_BITS) + dy;
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r = ((y1 * 7) >> FRAC_BITS) & 0xff;
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g = (((x1 + y1) * 9) >> FRAC_BITS) & 0xff;
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b = ((x1 * 5) >> FRAC_BITS) & 0xff;
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put_pixel(x, y, r, g, b);
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}
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}
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/* then some noise with very high intensity to test saturation */
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seed1 = num;
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for (y = 0; y < NOISE_W; y++) {
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for (x = 0; x < NOISE_W; x++) {
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r = myrnd(&seed1, 256);
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g = myrnd(&seed1, 256);
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b = myrnd(&seed1, 256);
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put_pixel(x + NOISE_X, y + NOISE_Y, r, g, b);
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}
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}
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/* then moving objects */
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for (i = 0; i < NB_OBJS; i++) {
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VObj *p = &objs[i];
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seed1 = i;
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for (y = 0; y < p->h; y++) {
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for (x = 0; x < p->w; x++) {
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r = p->r;
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g = p->g;
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b = p->b;
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/* add a per object noise */
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r += myrnd(&seed1, 50);
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g += myrnd(&seed1, 50);
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b += myrnd(&seed1, 50);
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put_pixel(x + p->x, y + p->y, r, g, b);
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}
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}
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p->x += myrnd(&seed, 21) - 10;
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p->y += myrnd(&seed, 21) - 10;
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}
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}
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int main(int argc, char **argv)
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{
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int w, h, i;
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char buf[1024];
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int isdir = 0;
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if (argc != 2) {
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printf("usage: %s file|dir\n"
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"generate a test video stream\n", argv[0]);
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exit(1);
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}
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if (!freopen(argv[1], "wb", stdout))
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isdir = 1;
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w = DEFAULT_WIDTH;
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h = DEFAULT_HEIGHT;
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rgb_tab = malloc(w * h * 3);
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wrap = w * 3;
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width = w;
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height = h;
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for (i = 0; i < DEFAULT_NB_PICT; i++) {
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gen_image(i, w, h);
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if (isdir) {
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snprintf(buf, sizeof(buf), "%s%02d.pgm", argv[1], i);
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pgmyuv_save(buf, w, h, rgb_tab);
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} else {
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pgmyuv_save(NULL, w, h, rgb_tab);
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}
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}
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free(rgb_tab);
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return 0;
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}
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