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ffmpeg / tests / rotozoom.c @ 6afd3b92

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/*
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 * Generates a synthetic YUV video sequence suitable for codec testing.
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 * GPLv2
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 * rotozoom.c -> s.bechet@av7.net
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 */
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#include <stdlib.h>
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#include <stdio.h>
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#include <inttypes.h>
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#define FIXP (1<<16)
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#define MY_PI 205887 //(M_PI*FIX)
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static int64_t int_pow(int64_t a, int p){
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    int64_t v= FIXP;
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    for(; p; p--){
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        v*= a;
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        v/= FIXP;
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    }
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    return v;
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}
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static int64_t int_sin(int64_t a){
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    if(a<0) a= MY_PI-a; // 0..inf
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    a %= 2*MY_PI;       // 0..2PI
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    if(a>=MY_PI*3/2) a -= 2*MY_PI;  // -PI/2 .. 3PI/2
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    if(a>=MY_PI/2  ) a = MY_PI - a; // -PI/2 ..  PI/2
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    return a - int_pow(a, 3)/6 + int_pow(a, 5)/120 - int_pow(a, 7)/5040;
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}
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#define SCALEBITS 8
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#define ONE_HALF  (1 << (SCALEBITS - 1))
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#define FIX(x)                ((int) ((x) * (1L<<SCALEBITS) + 0.5))
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typedef unsigned char UINT8;
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static void rgb24_to_yuv420p(UINT8 *lum, UINT8 *cb, UINT8 *cr,
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                              UINT8 *src, int width, int height)
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{
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    int wrap, wrap3, x, y;
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    int r, g, b, r1, g1, b1;
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    UINT8 *p;
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    wrap = width;
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    wrap3 = width * 3;
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    p = src;
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    for(y=0;y<height;y+=2) {
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        for(x=0;x<width;x+=2) {
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            r = p[0];
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            g = p[1];
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            b = p[2];
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            r1 = r;
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            g1 = g;
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            b1 = b;
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            lum[0] = (FIX(0.29900) * r + FIX(0.58700) * g + 
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                      FIX(0.11400) * b + ONE_HALF) >> SCALEBITS;
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            r = p[3];
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            g = p[4];
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            b = p[5];
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            r1 += r;
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            g1 += g;
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            b1 += b;
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            lum[1] = (FIX(0.29900) * r + FIX(0.58700) * g + 
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                      FIX(0.11400) * b + ONE_HALF) >> SCALEBITS;
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            p += wrap3;
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            lum += wrap;
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            r = p[0];
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            g = p[1];
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            b = p[2];
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            r1 += r;
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            g1 += g;
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            b1 += b;
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            lum[0] = (FIX(0.29900) * r + FIX(0.58700) * g + 
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                      FIX(0.11400) * b + ONE_HALF) >> SCALEBITS;
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            r = p[3];
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            g = p[4];
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            b = p[5];
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            r1 += r;
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            g1 += g;
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            b1 += b;
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            lum[1] = (FIX(0.29900) * r + FIX(0.58700) * g + 
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                      FIX(0.11400) * b + ONE_HALF) >> SCALEBITS;
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            cb[0] = ((- FIX(0.16874) * r1 - FIX(0.33126) * g1 + 
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                      FIX(0.50000) * b1 + 4 * ONE_HALF - 1) >> (SCALEBITS + 2)) + 128;
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            cr[0] = ((FIX(0.50000) * r1 - FIX(0.41869) * g1 - 
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                     FIX(0.08131) * b1 + 4 * ONE_HALF - 1) >> (SCALEBITS + 2)) + 128;
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            cb++;
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            cr++;
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            p += -wrap3 + 2 * 3;
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            lum += -wrap + 2;
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        }
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        p += wrap3;
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        lum += wrap;
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    }
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}
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/* cif format */
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#define DEFAULT_WIDTH   352
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#define DEFAULT_HEIGHT  288
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#define DEFAULT_NB_PICT 50
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void pgmyuv_save(const char *filename, int w, int h,
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                 unsigned char *rgb_tab)
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{
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    FILE *f;
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    int i, h2, w2;
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    unsigned char *cb, *cr;
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    unsigned char *lum_tab, *cb_tab, *cr_tab;
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    lum_tab = malloc(w * h);
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    cb_tab = malloc((w * h) / 4);
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    cr_tab = malloc((w * h) / 4);
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    rgb24_to_yuv420p(lum_tab, cb_tab, cr_tab, rgb_tab, w, h);
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    f = fopen(filename,"w");
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    fprintf(f, "P5\n%d %d\n%d\n", w, (h * 3) / 2, 255);
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    fwrite(lum_tab, 1, w * h, f);
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    h2 = h / 2;
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    w2 = w / 2;
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    cb = cb_tab;
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    cr = cr_tab;
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    for(i=0;i<h2;i++) {
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        fwrite(cb, 1, w2, f);
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        fwrite(cr, 1, w2, f);
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        cb += w2;
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        cr += w2;
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    }
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    fclose(f);
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    free(lum_tab);
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    free(cb_tab);
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    free(cr_tab);
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}
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unsigned char *rgb_tab;
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int width, height, wrap;
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void put_pixel(int x, int y, int r, int g, int b)
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{
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    unsigned char *p;
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    if (x < 0 || x >= width ||
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        y < 0 || y >= height)
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        return;
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    p = rgb_tab + y * wrap + x * 3;
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    p[0] = r;
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    p[1] = g;
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    p[2] = b;
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}
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unsigned char tab_r[256*256];
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unsigned char tab_g[256*256];
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unsigned char tab_b[256*256];
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int teta = 0;
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int h_cos [360];
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int h_sin [360];
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void gen_image(int num, int w, int h)
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{
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  const int c = h_cos [teta];
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  const int s = h_sin [teta];
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  const int xi = -(w/2) * c;
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  const int yi =  (w/2) * s;
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  const int xj = -(h/2) * s;
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  const int yj = -(h/2) * c;
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  unsigned dep;
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  int i,j;
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  int x,y;
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  int xprime = xj;
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  int yprime = yj;
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  for (j=0;j<h;j++) {
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    x = xprime + xi + FIXP*w/2;
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    xprime += s;
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    y = yprime + yi + FIXP*h/2;
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    yprime += c;
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    for ( i=0 ; i<w ; i++ ) {
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      x += c;
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      y -= s;
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      dep = ((x>>16)&255) + (((y>>16)&255)<<8);
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      put_pixel(i, j, tab_r[dep], tab_g[dep], tab_b[dep]);
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    }
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  }
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  teta = (teta+1) % 360;
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}
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#define W 256
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#define H 256
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void init_demo() {
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  int i,j;
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  int h;
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  int radian;
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  char line[3 * W];
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  FILE *fichier;
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  fichier = fopen("lena.pnm","r");
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  fread(line, 1, 15, fichier);
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  for (i=0;i<H;i++) {
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    fread(line,1,3*W,fichier);
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    for (j=0;j<W;j++) {
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          tab_r[W*i+j] = line[3*j    ];
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          tab_g[W*i+j] = line[3*j + 1];
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          tab_b[W*i+j] = line[3*j + 2];
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    }
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  }
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  fclose(fichier);
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  /* tables sin/cos */
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  for (i=0;i<360;i++) {
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    radian = 2*i*MY_PI/360;
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    h = 2*FIXP + int_sin (radian);
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    h_cos[i] = ( h * int_sin (radian + MY_PI/2) )/2/FIXP;
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    h_sin[i] = ( h * int_sin (radian          ) )/2/FIXP;
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  }
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}
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int main(int argc, char **argv)
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{
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    int w, h, i;
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    char buf[1024];
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    if (argc != 2) {
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        printf("usage: %s directory/\n"
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               "generate a test video stream\n", argv[0]);
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        exit(1);
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    }
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    w = DEFAULT_WIDTH;
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    h = DEFAULT_HEIGHT;
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    rgb_tab = malloc(w * h * 3);
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    wrap = w * 3;
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    width = w;
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    height = h;
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    init_demo();
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    for(i=0;i<DEFAULT_NB_PICT;i++) {
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        snprintf(buf, sizeof(buf), "%s%d.pgm", argv[1], i);
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        gen_image(i, w, h);
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        pgmyuv_save(buf, w, h, rgb_tab);
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    }
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    free(rgb_tab);
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    return 0;
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}