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
27 #define FIXP (1 << 16)
28 #define MY_PI 205887 // (M_PI * FIX)
30 static int64_t int_pow(int64_t a, int p)
42 static int64_t int_sin(int64_t a)
45 a = MY_PI - a; // 0..inf
46 a %= 2 * MY_PI; // 0..2PI
48 if (a >= MY_PI * 3 / 2)
49 a -= 2 * MY_PI; // -PI / 2 .. 3PI / 2
51 a = MY_PI - a; // -PI / 2 .. PI / 2
53 return a - int_pow(a, 3) / 6 + int_pow(a, 5) / 120 - int_pow(a, 7) / 5040;
57 #define ONE_HALF (1 << (SCALEBITS - 1))
58 #define FIX(x) ((int) ((x) * (1L << SCALEBITS) + 0.5))
60 static void rgb24_to_yuv420p(unsigned char *lum, unsigned char *cb,
61 unsigned char *cr, const unsigned char *src,
62 int width, int height)
64 int wrap, wrap3, x, y;
65 int r, g, b, r1, g1, b1;
66 const unsigned char *p;
71 for (y = 0; y < height; y += 2) {
72 for (x = 0; x < width; x += 2) {
79 lum[0] = (FIX(0.29900) * r + FIX(0.58700) * g +
80 FIX(0.11400) * b + ONE_HALF) >> SCALEBITS;
87 lum[1] = (FIX(0.29900) * r + FIX(0.58700) * g +
88 FIX(0.11400) * b + ONE_HALF) >> SCALEBITS;
98 lum[0] = (FIX(0.29900) * r + FIX(0.58700) * g +
99 FIX(0.11400) * b + ONE_HALF) >> SCALEBITS;
106 lum[1] = (FIX(0.29900) * r + FIX(0.58700) * g +
107 FIX(0.11400) * b + ONE_HALF) >> SCALEBITS;
109 cb[0] = ((- FIX(0.16874) * r1 - FIX(0.33126) * g1 +
110 FIX(0.50000) * b1 + 4 * ONE_HALF - 1) >> (SCALEBITS + 2)) + 128;
111 cr[0] = ((FIX(0.50000) * r1 - FIX(0.41869) * g1 -
112 FIX(0.08131) * b1 + 4 * ONE_HALF - 1) >> (SCALEBITS + 2)) + 128;
125 #define DEFAULT_WIDTH 352
126 #define DEFAULT_HEIGHT 288
127 #define DEFAULT_NB_PICT 50
129 static void pgmyuv_save(const char *filename, int w, int h,
130 unsigned char *rgb_tab)
134 unsigned char *cb, *cr;
135 unsigned char *lum_tab, *cb_tab, *cr_tab;
137 lum_tab = malloc(w * h);
138 cb_tab = malloc(w * h / 4);
139 cr_tab = malloc(w * h / 4);
141 rgb24_to_yuv420p(lum_tab, cb_tab, cr_tab, rgb_tab, w, h);
143 f = fopen(filename, "wb");
144 fprintf(f, "P5\n%d %d\n%d\n", w, h * 3 / 2, 255);
145 fwrite(lum_tab, 1, w * h, f);
150 for (i = 0; i < h2; i++) {
151 fwrite(cb, 1, w2, f);
152 fwrite(cr, 1, w2, f);
163 unsigned char *rgb_tab;
164 int width, height, wrap;
166 static void put_pixel(int x, int y, int r, int g, int b)
170 if (x < 0 || x >= width ||
171 y < 0 || y >= height)
174 p = rgb_tab + y * wrap + x * 3;
180 unsigned char tab_r[256 * 256];
181 unsigned char tab_g[256 * 256];
182 unsigned char tab_b[256 * 256];
187 static int ipol(uint8_t *src, int x, int y)
191 int frac_x = x & 0xFFFF;
192 int frac_y = y & 0xFFFF;
193 int s00 = src[( int_x & 255) + 256 * ( int_y & 255)];
194 int s01 = src[((int_x + 1) & 255) + 256 * ( int_y & 255)];
195 int s10 = src[( int_x & 255) + 256 * ((int_y + 1) & 255)];
196 int s11 = src[((int_x + 1) & 255) + 256 * ((int_y + 1) & 255)];
197 int s0 = (((1 << 16) - frac_x) * s00 + frac_x * s01) >> 8;
198 int s1 = (((1 << 16) - frac_x) * s10 + frac_x * s11) >> 8;
200 return (((1 << 16) - frac_y) * s0 + frac_y * s1) >> 24;
203 static void gen_image(int num, int w, int h)
205 const int c = h_cos[num % 360];
206 const int s = h_sin[num % 360];
208 const int xi = -(w / 2) * c;
209 const int yi = (w / 2) * s;
211 const int xj = -(h / 2) * s;
212 const int yj = -(h / 2) * c;
219 for (j = 0; j < h; j++) {
220 x = xprime + xi + FIXP * w / 2;
223 y = yprime + yi + FIXP * h / 2;
226 for (i = 0; i < w; i++) {
240 static int init_demo(const char *filename)
249 input_file = fopen(filename, "rb");
255 if (fread(line, 1, 15, input_file) != 15)
257 for (i = 0; i < H; i++) {
258 if (fread(line, 1, 3 * W, input_file) != 3 * W)
260 for (j = 0; j < W; j++) {
261 tab_r[W * i + j] = line[3 * j ];
262 tab_g[W * i + j] = line[3 * j + 1];
263 tab_b[W * i + j] = line[3 * j + 2];
269 for (i = 0; i < 360; i++) {
270 radian = 2 * i * MY_PI / 360;
271 h = 2 * FIXP + int_sin(radian);
272 h_cos[i] = h * int_sin(radian + MY_PI / 2) / 2 / FIXP;
273 h_sin[i] = h * int_sin(radian) / 2 / FIXP;
279 int main(int argc, char **argv)
285 printf("usage: %s directory/ image.pnm\n"
286 "generate a test video stream\n", argv[0]);
293 rgb_tab = malloc(w * h * 3);
298 if (init_demo(argv[2]))
301 for (i = 0; i < DEFAULT_NB_PICT; i++) {
302 snprintf(buf, sizeof(buf), "%s%02d.pgm", argv[1], i);
304 pgmyuv_save(buf, w, h, rgb_tab);