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