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tests/rotozoom.c

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00001 /*
00002  * Generates a synthetic YUV video sequence suitable for codec testing.
00003  *
00004  * copyright (c) Sebastien Bechet <s.bechet@av7.net>
00005  *
00006  * This file is part of FFmpeg.
00007  *
00008  * FFmpeg is free software; you can redistribute it and/or
00009  * modify it under the terms of the GNU Lesser General Public
00010  * License as published by the Free Software Foundation; either
00011  * version 2.1 of the License, or (at your option) any later version.
00012  *
00013  * FFmpeg is distributed in the hope that it will be useful,
00014  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00015  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00016  * Lesser General Public License for more details.
00017  *
00018  * You should have received a copy of the GNU Lesser General Public
00019  * License along with FFmpeg; if not, write to the Free Software
00020  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00021  */
00022 
00023 #include <stdlib.h>
00024 #include <stdio.h>
00025 #include <inttypes.h>
00026 
00027 #define FIXP (1<<16)
00028 #define MY_PI 205887 //(M_PI*FIX)
00029 
00030 static int64_t int_pow(int64_t a, int p){
00031     int64_t v= FIXP;
00032 
00033     for(; p; p--){
00034         v*= a;
00035         v/= FIXP;
00036     }
00037 
00038     return v;
00039 }
00040 
00041 static int64_t int_sin(int64_t a){
00042     if(a<0) a= MY_PI-a; // 0..inf
00043     a %= 2*MY_PI;       // 0..2PI
00044 
00045     if(a>=MY_PI*3/2) a -= 2*MY_PI;  // -PI/2 .. 3PI/2
00046     if(a>=MY_PI/2  ) a = MY_PI - a; // -PI/2 ..  PI/2
00047 
00048     return a - int_pow(a, 3)/6 + int_pow(a, 5)/120 - int_pow(a, 7)/5040;
00049 }
00050 
00051 #define SCALEBITS 8
00052 #define ONE_HALF  (1 << (SCALEBITS - 1))
00053 #define FIX(x)    ((int) ((x) * (1L<<SCALEBITS) + 0.5))
00054 typedef unsigned char UINT8;
00055 
00056 static void rgb24_to_yuv420p(UINT8 *lum, UINT8 *cb, UINT8 *cr,
00057                               UINT8 *src, int width, int height)
00058 {
00059     int wrap, wrap3, x, y;
00060     int r, g, b, r1, g1, b1;
00061     UINT8 *p;
00062 
00063     wrap = width;
00064     wrap3 = width * 3;
00065     p = src;
00066     for(y=0;y<height;y+=2) {
00067         for(x=0;x<width;x+=2) {
00068             r = p[0];
00069             g = p[1];
00070             b = p[2];
00071             r1 = r;
00072             g1 = g;
00073             b1 = b;
00074             lum[0] = (FIX(0.29900) * r + FIX(0.58700) * g +
00075                       FIX(0.11400) * b + ONE_HALF) >> SCALEBITS;
00076             r = p[3];
00077             g = p[4];
00078             b = p[5];
00079             r1 += r;
00080             g1 += g;
00081             b1 += b;
00082             lum[1] = (FIX(0.29900) * r + FIX(0.58700) * g +
00083                       FIX(0.11400) * b + ONE_HALF) >> SCALEBITS;
00084             p += wrap3;
00085             lum += wrap;
00086 
00087             r = p[0];
00088             g = p[1];
00089             b = p[2];
00090             r1 += r;
00091             g1 += g;
00092             b1 += b;
00093             lum[0] = (FIX(0.29900) * r + FIX(0.58700) * g +
00094                       FIX(0.11400) * b + ONE_HALF) >> SCALEBITS;
00095             r = p[3];
00096             g = p[4];
00097             b = p[5];
00098             r1 += r;
00099             g1 += g;
00100             b1 += b;
00101             lum[1] = (FIX(0.29900) * r + FIX(0.58700) * g +
00102                       FIX(0.11400) * b + ONE_HALF) >> SCALEBITS;
00103 
00104             cb[0] = ((- FIX(0.16874) * r1 - FIX(0.33126) * g1 +
00105                       FIX(0.50000) * b1 + 4 * ONE_HALF - 1) >> (SCALEBITS + 2)) + 128;
00106             cr[0] = ((FIX(0.50000) * r1 - FIX(0.41869) * g1 -
00107                      FIX(0.08131) * b1 + 4 * ONE_HALF - 1) >> (SCALEBITS + 2)) + 128;
00108 
00109             cb++;
00110             cr++;
00111             p += -wrap3 + 2 * 3;
00112             lum += -wrap + 2;
00113         }
00114         p += wrap3;
00115         lum += wrap;
00116     }
00117 }
00118 
00119 /* cif format */
00120 #define DEFAULT_WIDTH   352
00121 #define DEFAULT_HEIGHT  288
00122 #define DEFAULT_NB_PICT 50
00123 
00124 static void pgmyuv_save(const char *filename, int w, int h,
00125                         unsigned char *rgb_tab)
00126 {
00127     FILE *f;
00128     int i, h2, w2;
00129     unsigned char *cb, *cr;
00130     unsigned char *lum_tab, *cb_tab, *cr_tab;
00131 
00132     lum_tab = malloc(w * h);
00133     cb_tab = malloc((w * h) / 4);
00134     cr_tab = malloc((w * h) / 4);
00135 
00136     rgb24_to_yuv420p(lum_tab, cb_tab, cr_tab, rgb_tab, w, h);
00137 
00138     f = fopen(filename,"wb");
00139     fprintf(f, "P5\n%d %d\n%d\n", w, (h * 3) / 2, 255);
00140     fwrite(lum_tab, 1, w * h, f);
00141     h2 = h / 2;
00142     w2 = w / 2;
00143     cb = cb_tab;
00144     cr = cr_tab;
00145     for(i=0;i<h2;i++) {
00146         fwrite(cb, 1, w2, f);
00147         fwrite(cr, 1, w2, f);
00148         cb += w2;
00149         cr += w2;
00150     }
00151     fclose(f);
00152 
00153     free(lum_tab);
00154     free(cb_tab);
00155     free(cr_tab);
00156 }
00157 
00158 unsigned char *rgb_tab;
00159 int width, height, wrap;
00160 
00161 static void put_pixel(int x, int y, int r, int g, int b)
00162 {
00163     unsigned char *p;
00164 
00165     if (x < 0 || x >= width ||
00166         y < 0 || y >= height)
00167         return;
00168 
00169     p = rgb_tab + y * wrap + x * 3;
00170     p[0] = r;
00171     p[1] = g;
00172     p[2] = b;
00173 }
00174 
00175 unsigned char tab_r[256*256];
00176 unsigned char tab_g[256*256];
00177 unsigned char tab_b[256*256];
00178 
00179 int h_cos [360];
00180 int h_sin [360];
00181 
00182 static int ipol(uint8_t *src, int x, int y){
00183     int int_x= x>>16;
00184     int int_y= y>>16;
00185     int frac_x= x&0xFFFF;
00186     int frac_y= y&0xFFFF;
00187     int s00= src[ ( int_x   &255) + 256*( int_y   &255) ];
00188     int s01= src[ ((int_x+1)&255) + 256*( int_y   &255) ];
00189     int s10= src[ ( int_x   &255) + 256*((int_y+1)&255) ];
00190     int s11= src[ ((int_x+1)&255) + 256*((int_y+1)&255) ];
00191     int s0= (((1<<16) - frac_x)*s00 + frac_x*s01)>>8;
00192     int s1= (((1<<16) - frac_x)*s10 + frac_x*s11)>>8;
00193 
00194     return (((1<<16) - frac_y)*s0 + frac_y*s1)>>24;
00195 }
00196 
00197 static void gen_image(int num, int w, int h)
00198 {
00199   const int c = h_cos [num % 360];
00200   const int s = h_sin [num % 360];
00201 
00202   const int xi = -(w/2) * c;
00203   const int yi =  (w/2) * s;
00204 
00205   const int xj = -(h/2) * s;
00206   const int yj = -(h/2) * c;
00207   int i,j;
00208 
00209   int x,y;
00210   int xprime = xj;
00211   int yprime = yj;
00212 
00213 
00214   for (j=0;j<h;j++) {
00215 
00216     x = xprime + xi + FIXP*w/2;
00217     xprime += s;
00218 
00219     y = yprime + yi + FIXP*h/2;
00220     yprime += c;
00221 
00222     for ( i=0 ; i<w ; i++ ) {
00223       x += c;
00224       y -= s;
00225 #if 1
00226       put_pixel(i, j, ipol(tab_r, x, y), ipol(tab_g, x, y), ipol(tab_b, x, y));
00227 #else
00228       {
00229           unsigned dep;
00230           dep = ((x>>16)&255) + (((y>>16)&255)<<8);
00231           put_pixel(i, j, tab_r[dep], tab_g[dep], tab_b[dep]);
00232       }
00233 #endif
00234     }
00235   }
00236 }
00237 
00238 #define W 256
00239 #define H 256
00240 
00241 static void init_demo(const char *filename) {
00242   int i,j;
00243   int h;
00244   int radian;
00245   char line[3 * W];
00246 
00247   FILE *fichier;
00248 
00249   fichier = fopen(filename,"rb");
00250   if (!fichier) {
00251       perror(filename);
00252       exit(1);
00253   }
00254 
00255   fread(line, 1, 15, fichier);
00256   for (i=0;i<H;i++) {
00257     fread(line,1,3*W,fichier);
00258     for (j=0;j<W;j++) {
00259           tab_r[W*i+j] = line[3*j    ];
00260           tab_g[W*i+j] = line[3*j + 1];
00261           tab_b[W*i+j] = line[3*j + 2];
00262     }
00263   }
00264   fclose(fichier);
00265 
00266   /* tables sin/cos */
00267   for (i=0;i<360;i++) {
00268     radian = 2*i*MY_PI/360;
00269     h = 2*FIXP + int_sin (radian);
00270     h_cos[i] = ( h * int_sin (radian + MY_PI/2) )/2/FIXP;
00271     h_sin[i] = ( h * int_sin (radian          ) )/2/FIXP;
00272   }
00273 }
00274 
00275 int main(int argc, char **argv)
00276 {
00277     int w, h, i;
00278     char buf[1024];
00279 
00280     if (argc != 3) {
00281         printf("usage: %s directory/ image.pnm\n"
00282                "generate a test video stream\n", argv[0]);
00283         exit(1);
00284     }
00285 
00286     w = DEFAULT_WIDTH;
00287     h = DEFAULT_HEIGHT;
00288 
00289     rgb_tab = malloc(w * h * 3);
00290     wrap = w * 3;
00291     width = w;
00292     height = h;
00293 
00294     init_demo(argv[2]);
00295 
00296     for(i=0;i<DEFAULT_NB_PICT;i++) {
00297         snprintf(buf, sizeof(buf), "%s%02d.pgm", argv[1], i);
00298         gen_image(i, w, h);
00299         pgmyuv_save(buf, w, h, rgb_tab);
00300     }
00301 
00302     free(rgb_tab);
00303     return 0;
00304 }

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