2 * Generate a synthetic YUV video sequence suitable for codec testing.
4 * copyright (c) Sebastien Bechet <s.bechet@av7.net>
6 * This file is part of FFmpeg.
8 * FFmpeg is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; either
11 * version 2.1 of the License, or (at your option) any later version.
13 * FFmpeg is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Lesser General Public License for more details.
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with FFmpeg; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
29 #define FIXP (1 << 16)
30 #define MY_PI 205887 // (M_PI * FIX)
32 static int64_t int_pow(int64_t a, int p)
44 static int64_t int_sin(int64_t a)
47 a = MY_PI - a; // 0..inf
48 a %= 2 * MY_PI; // 0..2PI
50 if (a >= MY_PI * 3 / 2)
51 a -= 2 * MY_PI; // -PI / 2 .. 3PI / 2
53 a = MY_PI - a; // -PI / 2 .. PI / 2
55 return a - int_pow(a, 3) / 6 + int_pow(a, 5) / 120 - int_pow(a, 7) / 5040;
58 static unsigned char tab_r[256 * 256];
59 static unsigned char tab_g[256 * 256];
60 static unsigned char tab_b[256 * 256];
62 static int h_cos[360];
63 static int h_sin[360];
65 static int ipol(uint8_t *src, int x, int y)
69 int frac_x = x & 0xFFFF;
70 int frac_y = y & 0xFFFF;
71 int s00 = src[( int_x & 255) + 256 * ( int_y & 255)];
72 int s01 = src[((int_x + 1) & 255) + 256 * ( int_y & 255)];
73 int s10 = src[( int_x & 255) + 256 * ((int_y + 1) & 255)];
74 int s11 = src[((int_x + 1) & 255) + 256 * ((int_y + 1) & 255)];
75 int s0 = (((1 << 16) - frac_x) * s00 + frac_x * s01) >> 8;
76 int s1 = (((1 << 16) - frac_x) * s10 + frac_x * s11) >> 8;
78 return (((1 << 16) - frac_y) * s0 + frac_y * s1) >> 24;
81 static void gen_image(int num, int w, int h)
83 const int c = h_cos[num % 360];
84 const int s = h_sin[num % 360];
86 const int xi = -(w / 2) * c;
87 const int yi = (w / 2) * s;
89 const int xj = -(h / 2) * s;
90 const int yj = -(h / 2) * c;
97 for (j = 0; j < h; j++) {
98 x = xprime + xi + FIXP * w / 2;
101 y = yprime + yi + FIXP * h / 2;
104 for (i = 0; i < w; i++) {
118 static int init_demo(const char *filename)
127 input_file = fopen(filename, "rb");
133 if (fread(line, 1, 15, input_file) != 15)
135 for (i = 0; i < H; i++) {
136 if (fread(line, 1, 3 * W, input_file) != 3 * W)
138 for (j = 0; j < W; j++) {
139 tab_r[W * i + j] = line[3 * j ];
140 tab_g[W * i + j] = line[3 * j + 1];
141 tab_b[W * i + j] = line[3 * j + 2];
147 for (i = 0; i < 360; i++) {
148 radian = 2 * i * MY_PI / 360;
149 h = 2 * FIXP + int_sin(radian);
150 h_cos[i] = h * int_sin(radian + MY_PI / 2) / 2 / FIXP;
151 h_sin[i] = h * int_sin(radian) / 2 / FIXP;
157 int main(int argc, char **argv)
164 printf("usage: %s image.pnm file|dir\n"
165 "generate a test video stream\n", argv[0]);
169 if (!freopen(argv[2], "wb", stdout))
175 rgb_tab = malloc(w * h * 3);
180 if (init_demo(argv[1]))
183 for (i = 0; i < DEFAULT_NB_PICT; i++) {
186 snprintf(buf, sizeof(buf), "%s%02d.pgm", argv[2], i);
187 pgmyuv_save(buf, w, h, rgb_tab);
189 pgmyuv_save(NULL, w, h, rgb_tab);