summaryrefslogtreecommitdiff
path: root/tests/videogen.c
blob: 226c4dd4f061e3e88e3c244caa7ab9fca0fee9c5 (plain)
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
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
/*
 * Generates a synthetic YUV video sequence suitable for codec testing.
 * NOTE: No floats are used to guarantee a bit exact 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 <stdio.h>

#define SCALEBITS 8
#define ONE_HALF  (1 << (SCALEBITS - 1))
#define FIX(x)    ((int) ((x) * (1L<<SCALEBITS) + 0.5))
typedef unsigned char uint8_t;

static void rgb24_to_yuv420p(uint8_t *lum, uint8_t *cb, uint8_t *cr,
                              uint8_t *src, int width, int height)
{
    int wrap, wrap3, x, y;
    int r, g, b, r1, g1, b1;
    uint8_t *p;

    wrap = width;
    wrap3 = width * 3;
    p = src;
    for(y=0;y<height;y+=2) {
        for(x=0;x<width;x+=2) {
            r = p[0];
            g = p[1];
            b = p[2];
            r1 = r;
            g1 = g;
            b1 = b;
            lum[0] = (FIX(0.29900) * r + FIX(0.58700) * g +
                      FIX(0.11400) * b + ONE_HALF) >> SCALEBITS;
            r = p[3];
            g = p[4];
            b = p[5];
            r1 += r;
            g1 += g;
            b1 += b;
            lum[1] = (FIX(0.29900) * r + FIX(0.58700) * g +
                      FIX(0.11400) * b + ONE_HALF) >> SCALEBITS;
            p += wrap3;
            lum += wrap;

            r = p[0];
            g = p[1];
            b = p[2];
            r1 += r;
            g1 += g;
            b1 += b;
            lum[0] = (FIX(0.29900) * r + FIX(0.58700) * g +
                      FIX(0.11400) * b + ONE_HALF) >> SCALEBITS;
            r = p[3];
            g = p[4];
            b = p[5];
            r1 += r;
            g1 += g;
            b1 += b;
            lum[1] = (FIX(0.29900) * r + FIX(0.58700) * g +
                      FIX(0.11400) * b + ONE_HALF) >> SCALEBITS;

            cb[0] = ((- FIX(0.16874) * r1 - FIX(0.33126) * g1 +
                      FIX(0.50000) * b1 + 4 * ONE_HALF - 1) >> (SCALEBITS + 2)) + 128;
            cr[0] = ((FIX(0.50000) * r1 - FIX(0.41869) * g1 -
                     FIX(0.08131) * b1 + 4 * ONE_HALF - 1) >> (SCALEBITS + 2)) + 128;

            cb++;
            cr++;
            p += -wrap3 + 2 * 3;
            lum += -wrap + 2;
        }
        p += wrap3;
        lum += wrap;
    }
}

/* cif format */
#define DEFAULT_WIDTH   352
#define DEFAULT_HEIGHT  288
#define DEFAULT_NB_PICT 50 /* 2 seconds */

void pgmyuv_save(const char *filename, int w, int h,
                 unsigned char *rgb_tab)
{
    FILE *f;
    int i, h2, w2;
    unsigned char *cb, *cr;
    unsigned char *lum_tab, *cb_tab, *cr_tab;

    lum_tab = malloc(w * h);
    cb_tab = malloc((w * h) / 4);
    cr_tab = malloc((w * h) / 4);

    rgb24_to_yuv420p(lum_tab, cb_tab, cr_tab, rgb_tab, w, h);

    f = fopen(filename,"wb");
    fprintf(f, "P5\n%d %d\n%d\n", w, (h * 3) / 2, 255);
    fwrite(lum_tab, 1, w * h, f);
    h2 = h / 2;
    w2 = w / 2;
    cb = cb_tab;
    cr = cr_tab;
    for(i=0;i<h2;i++) {
        fwrite(cb, 1, w2, f);
        fwrite(cr, 1, w2, f);
        cb += w2;
        cr += w2;
    }
    fclose(f);

    free(lum_tab);
    free(cb_tab);
    free(cr_tab);
}

unsigned char *rgb_tab;
int width, height, wrap;

void put_pixel(int x, int y, int r, int g, int b)
{
    unsigned char *p;

    if (x < 0 || x >= width ||
        y < 0 || y >= height)
        return;

    p = rgb_tab + y * wrap + x * 3;
    p[0] = r;
    p[1] = g;
    p[2] = b;
}

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 */
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;

VObj objs[NB_OBJS];

unsigned int seed = 1;

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) + dx;
            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 0
    for(i=0;i<256;i++)
        printf("cos(%d)=%d\n", i, int_cos(i));
#endif

    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;
}