4xm: remove unneeded check for remaining unused data.
[libav.git] / tests / rotozoom.c
1 /*
2 * Generate a synthetic YUV video sequence suitable for codec testing.
3 *
4 * copyright (c) Sebastien Bechet <s.bechet@av7.net>
5 *
6 * This file is part of Libav.
7 *
8 * Libav 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.
12 *
13 * Libav 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.
17 *
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with Libav; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 */
22
23 #include <stdlib.h>
24 #include <stdio.h>
25 #include <inttypes.h>
26
27 #define FIXP (1 << 16)
28 #define MY_PI 205887 //(M_PI * FIX)
29
30 static int64_t int_pow(int64_t a, int p)
31 {
32 int64_t v = FIXP;
33
34 for (; p; p--) {
35 v *= a;
36 v /= FIXP;
37 }
38
39 return v;
40 }
41
42 static int64_t int_sin(int64_t a)
43 {
44 if (a < 0)
45 a = MY_PI - a; // 0..inf
46 a %= 2 * MY_PI; // 0..2PI
47
48 if (a >= MY_PI * 3 / 2)
49 a -= 2 * MY_PI; // -PI / 2 .. 3PI / 2
50 if (a >= MY_PI /2)
51 a = MY_PI - a; // -PI / 2 .. PI / 2
52
53 return a - int_pow(a, 3) / 6 + int_pow(a, 5) / 120 - int_pow(a, 7) / 5040;
54 }
55
56 #define SCALEBITS 8
57 #define ONE_HALF (1 << (SCALEBITS - 1))
58 #define FIX(x) ((int) ((x) * (1L << SCALEBITS) + 0.5))
59
60 static void rgb24_to_yuv420p(unsigned char *lum, unsigned char *cb,
61 unsigned char *cr, unsigned char *src,
62 int width, int height)
63 {
64 int wrap, wrap3, x, y;
65 int r, g, b, r1, g1, b1;
66 unsigned char *p;
67
68 wrap = width;
69 wrap3 = width * 3;
70 p = src;
71 for (y = 0; y < height; y += 2) {
72 for (x = 0; x < width; x += 2) {
73 r = p[0];
74 g = p[1];
75 b = p[2];
76 r1 = r;
77 g1 = g;
78 b1 = b;
79 lum[0] = (FIX(0.29900) * r + FIX(0.58700) * g +
80 FIX(0.11400) * b + ONE_HALF) >> SCALEBITS;
81 r = p[3];
82 g = p[4];
83 b = p[5];
84 r1 += r;
85 g1 += g;
86 b1 += b;
87 lum[1] = (FIX(0.29900) * r + FIX(0.58700) * g +
88 FIX(0.11400) * b + ONE_HALF) >> SCALEBITS;
89 p += wrap3;
90 lum += wrap;
91
92 r = p[0];
93 g = p[1];
94 b = p[2];
95 r1 += r;
96 g1 += g;
97 b1 += b;
98 lum[0] = (FIX(0.29900) * r + FIX(0.58700) * g +
99 FIX(0.11400) * b + ONE_HALF) >> SCALEBITS;
100 r = p[3];
101 g = p[4];
102 b = p[5];
103 r1 += r;
104 g1 += g;
105 b1 += b;
106 lum[1] = (FIX(0.29900) * r + FIX(0.58700) * g +
107 FIX(0.11400) * b + ONE_HALF) >> SCALEBITS;
108
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;
113
114 cb++;
115 cr++;
116 p += -wrap3 + 2 * 3;
117 lum += -wrap + 2;
118 }
119 p += wrap3;
120 lum += wrap;
121 }
122 }
123
124 /* cif format */
125 #define DEFAULT_WIDTH 352
126 #define DEFAULT_HEIGHT 288
127 #define DEFAULT_NB_PICT 50
128
129 static void pgmyuv_save(const char *filename, int w, int h,
130 unsigned char *rgb_tab)
131 {
132 FILE *f;
133 int i, h2, w2;
134 unsigned char *cb, *cr;
135 unsigned char *lum_tab, *cb_tab, *cr_tab;
136
137 lum_tab = malloc(w * h);
138 cb_tab = malloc(w * h / 4);
139 cr_tab = malloc(w * h / 4);
140
141 rgb24_to_yuv420p(lum_tab, cb_tab, cr_tab, rgb_tab, w, h);
142
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);
146 h2 = h / 2;
147 w2 = w / 2;
148 cb = cb_tab;
149 cr = cr_tab;
150 for (i = 0; i < h2; i++) {
151 fwrite(cb, 1, w2, f);
152 fwrite(cr, 1, w2, f);
153 cb += w2;
154 cr += w2;
155 }
156 fclose(f);
157
158 free(lum_tab);
159 free(cb_tab);
160 free(cr_tab);
161 }
162
163 unsigned char *rgb_tab;
164 int width, height, wrap;
165
166 static void put_pixel(int x, int y, int r, int g, int b)
167 {
168 unsigned char *p;
169
170 if (x < 0 || x >= width ||
171 y < 0 || y >= height)
172 return;
173
174 p = rgb_tab + y * wrap + x * 3;
175 p[0] = r;
176 p[1] = g;
177 p[2] = b;
178 }
179
180 unsigned char tab_r[256 * 256];
181 unsigned char tab_g[256 * 256];
182 unsigned char tab_b[256 * 256];
183
184 int h_cos [360];
185 int h_sin [360];
186
187 static int ipol(uint8_t *src, int x, int y)
188 {
189 int int_x = x >> 16;
190 int int_y = y >> 16;
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;
199
200 return (((1 << 16) - frac_y) * s0 + frac_y * s1) >> 24;
201 }
202
203 static void gen_image(int num, int w, int h)
204 {
205 const int c = h_cos [num % 360];
206 const int s = h_sin [num % 360];
207
208 const int xi = -(w / 2) * c;
209 const int yi = (w / 2) * s;
210
211 const int xj = -(h / 2) * s;
212 const int yj = -(h / 2) * c;
213 int i, j;
214
215 int x, y;
216 int xprime = xj;
217 int yprime = yj;
218
219 for (j = 0; j < h; j++) {
220 x = xprime + xi + FIXP * w / 2;
221 xprime += s;
222
223 y = yprime + yi + FIXP * h / 2;
224 yprime += c;
225
226 for (i = 0; i < w; i++ ) {
227 x += c;
228 y -= s;
229 put_pixel(i, j, ipol(tab_r, x, y), ipol(tab_g, x, y), ipol(tab_b, x, y));
230 }
231 }
232 }
233
234 #define W 256
235 #define H 256
236
237 static int init_demo(const char *filename)
238 {
239 int i, j;
240 int h;
241 int radian;
242 char line[3 * W];
243
244 FILE *input_file;
245
246 input_file = fopen(filename, "rb");
247 if (!input_file) {
248 perror(filename);
249 return 1;
250 }
251
252 if (fread(line, 1, 15, input_file) != 15)
253 return 1;
254 for (i = 0; i < H; i++) {
255 if (fread(line, 1, 3 * W, input_file) != 3 * W)
256 return 1;
257 for (j = 0; j < W; j++) {
258 tab_r[W * i + j] = line[3 * j ];
259 tab_g[W * i + j] = line[3 * j + 1];
260 tab_b[W * i + j] = line[3 * j + 2];
261 }
262 }
263 fclose(input_file);
264
265 /* tables sin/cos */
266 for (i = 0; i < 360; i++) {
267 radian = 2 * i * MY_PI / 360;
268 h = 2 * FIXP + int_sin (radian);
269 h_cos[i] = h * int_sin(radian + MY_PI / 2) / 2 / FIXP;
270 h_sin[i] = h * int_sin(radian) / 2 / FIXP;
271 }
272
273 return 0;
274 }
275
276 int main(int argc, char **argv)
277 {
278 int w, h, i;
279 char buf[1024];
280
281 if (argc != 3) {
282 printf("usage: %s directory/ image.pnm\n"
283 "generate a test video stream\n", argv[0]);
284 return 1;
285 }
286
287 w = DEFAULT_WIDTH;
288 h = DEFAULT_HEIGHT;
289
290 rgb_tab = malloc(w * h * 3);
291 wrap = w * 3;
292 width = w;
293 height = h;
294
295 if (init_demo(argv[2]))
296 return 1;
297
298 for (i = 0; i < DEFAULT_NB_PICT; i++) {
299 snprintf(buf, sizeof(buf), "%s%02d.pgm", argv[1], i);
300 gen_image(i, w, h);
301 pgmyuv_save(buf, w, h, rgb_tab);
302 }
303
304 free(rgb_tab);
305 return 0;
306 }