1/*
2 * Generates 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 FFmpeg.
7 *
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.
12 *
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.
17 *
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
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
30static int64_t int_pow(int64_t a, int p){
31    int64_t v= FIXP;
32
33    for(; p; p--){
34        v*= a;
35        v/= FIXP;
36    }
37
38    return v;
39}
40
41static int64_t int_sin(int64_t a){
42    if(a<0) a= MY_PI-a; // 0..inf
43    a %= 2*MY_PI;       // 0..2PI
44
45    if(a>=MY_PI*3/2) a -= 2*MY_PI;  // -PI/2 .. 3PI/2
46    if(a>=MY_PI/2  ) a = MY_PI - a; // -PI/2 ..  PI/2
47
48    return a - int_pow(a, 3)/6 + int_pow(a, 5)/120 - int_pow(a, 7)/5040;
49}
50
51#define SCALEBITS 8
52#define ONE_HALF  (1 << (SCALEBITS - 1))
53#define FIX(x)    ((int) ((x) * (1L<<SCALEBITS) + 0.5))
54typedef unsigned char UINT8;
55
56static void rgb24_to_yuv420p(UINT8 *lum, UINT8 *cb, UINT8 *cr,
57                              UINT8 *src, int width, int height)
58{
59    int wrap, wrap3, x, y;
60    int r, g, b, r1, g1, b1;
61    UINT8 *p;
62
63    wrap = width;
64    wrap3 = width * 3;
65    p = src;
66    for(y=0;y<height;y+=2) {
67        for(x=0;x<width;x+=2) {
68            r = p[0];
69            g = p[1];
70            b = p[2];
71            r1 = r;
72            g1 = g;
73            b1 = b;
74            lum[0] = (FIX(0.29900) * r + FIX(0.58700) * g +
75                      FIX(0.11400) * b + ONE_HALF) >> SCALEBITS;
76            r = p[3];
77            g = p[4];
78            b = p[5];
79            r1 += r;
80            g1 += g;
81            b1 += b;
82            lum[1] = (FIX(0.29900) * r + FIX(0.58700) * g +
83                      FIX(0.11400) * b + ONE_HALF) >> SCALEBITS;
84            p += wrap3;
85            lum += wrap;
86
87            r = p[0];
88            g = p[1];
89            b = p[2];
90            r1 += r;
91            g1 += g;
92            b1 += b;
93            lum[0] = (FIX(0.29900) * r + FIX(0.58700) * g +
94                      FIX(0.11400) * b + ONE_HALF) >> SCALEBITS;
95            r = p[3];
96            g = p[4];
97            b = p[5];
98            r1 += r;
99            g1 += g;
100            b1 += b;
101            lum[1] = (FIX(0.29900) * r + FIX(0.58700) * g +
102                      FIX(0.11400) * b + ONE_HALF) >> SCALEBITS;
103
104            cb[0] = ((- FIX(0.16874) * r1 - FIX(0.33126) * g1 +
105                      FIX(0.50000) * b1 + 4 * ONE_HALF - 1) >> (SCALEBITS + 2)) + 128;
106            cr[0] = ((FIX(0.50000) * r1 - FIX(0.41869) * g1 -
107                     FIX(0.08131) * b1 + 4 * ONE_HALF - 1) >> (SCALEBITS + 2)) + 128;
108
109            cb++;
110            cr++;
111            p += -wrap3 + 2 * 3;
112            lum += -wrap + 2;
113        }
114        p += wrap3;
115        lum += wrap;
116    }
117}
118
119/* cif format */
120#define DEFAULT_WIDTH   352
121#define DEFAULT_HEIGHT  288
122#define DEFAULT_NB_PICT 50
123
124static void pgmyuv_save(const char *filename, int w, int h,
125                        unsigned char *rgb_tab)
126{
127    FILE *f;
128    int i, h2, w2;
129    unsigned char *cb, *cr;
130    unsigned char *lum_tab, *cb_tab, *cr_tab;
131
132    lum_tab = malloc(w * h);
133    cb_tab = malloc((w * h) / 4);
134    cr_tab = malloc((w * h) / 4);
135
136    rgb24_to_yuv420p(lum_tab, cb_tab, cr_tab, rgb_tab, w, h);
137
138    f = fopen(filename,"wb");
139    fprintf(f, "P5\n%d %d\n%d\n", w, (h * 3) / 2, 255);
140    fwrite(lum_tab, 1, w * h, f);
141    h2 = h / 2;
142    w2 = w / 2;
143    cb = cb_tab;
144    cr = cr_tab;
145    for(i=0;i<h2;i++) {
146        fwrite(cb, 1, w2, f);
147        fwrite(cr, 1, w2, f);
148        cb += w2;
149        cr += w2;
150    }
151    fclose(f);
152
153    free(lum_tab);
154    free(cb_tab);
155    free(cr_tab);
156}
157
158unsigned char *rgb_tab;
159int width, height, wrap;
160
161static void put_pixel(int x, int y, int r, int g, int b)
162{
163    unsigned char *p;
164
165    if (x < 0 || x >= width ||
166        y < 0 || y >= height)
167        return;
168
169    p = rgb_tab + y * wrap + x * 3;
170    p[0] = r;
171    p[1] = g;
172    p[2] = b;
173}
174
175unsigned char tab_r[256*256];
176unsigned char tab_g[256*256];
177unsigned char tab_b[256*256];
178
179int teta = 0;
180int h_cos [360];
181int h_sin [360];
182
183static int ipol(uint8_t *src, int x, int y){
184    int int_x= x>>16;
185    int int_y= y>>16;
186    int frac_x= x&0xFFFF;
187    int frac_y= y&0xFFFF;
188    int s00= src[ ( int_x   &255) + 256*( int_y   &255) ];
189    int s01= src[ ((int_x+1)&255) + 256*( int_y   &255) ];
190    int s10= src[ ( int_x   &255) + 256*((int_y+1)&255) ];
191    int s11= src[ ((int_x+1)&255) + 256*((int_y+1)&255) ];
192    int s0= (((1<<16) - frac_x)*s00 + frac_x*s01)>>8;
193    int s1= (((1<<16) - frac_x)*s10 + frac_x*s11)>>8;
194
195    return (((1<<16) - frac_y)*s0 + frac_y*s1)>>24;
196}
197
198static void gen_image(int num, int w, int h)
199{
200  const int c = h_cos [teta];
201  const int s = h_sin [teta];
202
203  const int xi = -(w/2) * c;
204  const int yi =  (w/2) * s;
205
206  const int xj = -(h/2) * s;
207  const int yj = -(h/2) * c;
208  int i,j;
209
210  int x,y;
211  int xprime = xj;
212  int yprime = yj;
213
214
215  for (j=0;j<h;j++) {
216
217    x = xprime + xi + FIXP*w/2;
218    xprime += s;
219
220    y = yprime + yi + FIXP*h/2;
221    yprime += c;
222
223    for ( i=0 ; i<w ; i++ ) {
224      x += c;
225      y -= s;
226#if 1
227      put_pixel(i, j, ipol(tab_r, x, y), ipol(tab_g, x, y), ipol(tab_b, x, y));
228#else
229      {
230          unsigned dep;
231          dep = ((x>>16)&255) + (((y>>16)&255)<<8);
232          put_pixel(i, j, tab_r[dep], tab_g[dep], tab_b[dep]);
233      }
234#endif
235    }
236  }
237  teta = (teta+1) % 360;
238}
239
240#define W 256
241#define H 256
242
243static void init_demo(const char *filename) {
244  int i,j;
245  int h;
246  int radian;
247  char line[3 * W];
248
249  FILE *fichier;
250
251  fichier = fopen(filename,"rb");
252  if (!fichier) {
253      perror(filename);
254      exit(1);
255  }
256
257  fread(line, 1, 15, fichier);
258  for (i=0;i<H;i++) {
259    fread(line,1,3*W,fichier);
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];
264    }
265  }
266  fclose(fichier);
267
268  /* tables sin/cos */
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;
274  }
275}
276
277int main(int argc, char **argv)
278{
279    int w, h, i;
280    char buf[1024];
281
282    if (argc != 3) {
283        printf("usage: %s directory/ image.pnm\n"
284               "generate a test video stream\n", argv[0]);
285        exit(1);
286    }
287
288    w = DEFAULT_WIDTH;
289    h = DEFAULT_HEIGHT;
290
291    rgb_tab = malloc(w * h * 3);
292    wrap = w * 3;
293    width = w;
294    height = h;
295
296    init_demo(argv[2]);
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}
307