1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
|
/*
* 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);
}
// if (argc < 2)
// err_if(!freopen(NULL, "wb", stdout));
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++) {
gen_image(i, w, h);
if (argc > 1) {
snprintf(buf, sizeof(buf), "%s%02d.pgm", argv[1], i);
pgmyuv_save(buf, w, h, rgb_tab);
} else {
pgmyuv_save(NULL, w, h, rgb_tab);
}
}
free(rgb_tab);
return 0;
}
|
