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ffmpeg / tests / rotozoom.c @ e1e0ca70

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/*
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 * Generates a synthetic YUV video sequence suitable for codec testing.
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 *
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 * copyright (c) Sebastien Bechet <s.bechet@av7.net>
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 *
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 * This file is part of Libav.
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 *
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 * Libav is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
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 * version 2.1 of the License, or (at your option) any later version.
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 *
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 * Libav is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with Libav; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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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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{
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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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{
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    if (a < 0)
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        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)
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        a -= 2 * MY_PI; // -PI / 2 .. 3PI / 2
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    if (a >= MY_PI /2)
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        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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static void rgb24_to_yuv420p(unsigned char *lum, unsigned char *cb,
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                             unsigned char *cr, unsigned char *src,
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                             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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    unsigned char *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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static 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, "wb");
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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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static 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 h_cos [360];
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int h_sin [360];
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static int ipol(uint8_t *src, int x, int y)
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{
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    int int_x  = x >> 16;
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    int int_y  = y >> 16;
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    int frac_x = x & 0xFFFF;
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    int frac_y = y & 0xFFFF;
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    int s00    = src[( int_x      & 255) + 256 * ( int_y      & 255)];
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    int s01    = src[((int_x + 1) & 255) + 256 * ( int_y      & 255)];
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    int s10    = src[( int_x      & 255) + 256 * ((int_y + 1) & 255)];
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    int s11    = src[((int_x + 1) & 255) + 256 * ((int_y + 1) & 255)];
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    int s0     = (((1 << 16) - frac_x) * s00 + frac_x * s01) >> 8;
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    int s1     = (((1 << 16) - frac_x) * s10 + frac_x * s11) >> 8;
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    return (((1 << 16) - frac_y) * s0 + frac_y * s1) >> 24;
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}
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static void gen_image(int num, int w, int h)
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{
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    const int c = h_cos [num % 360];
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    const int s = h_sin [num % 360];
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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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    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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            put_pixel(i, j, ipol(tab_r, x, y), ipol(tab_g, x, y), ipol(tab_b, x, y));
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        }
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    }
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}
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#define W 256
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#define H 256
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static int init_demo(const char *filename)
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{
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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 *input_file;
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    input_file = fopen(filename, "rb");
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    if (!input_file) {
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        perror(filename);
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        return 1;
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    }
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    if (fread(line, 1, 15, input_file) != 15)
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        return 1;
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    for (i = 0; i < H; i++) {
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        if (fread(line, 1, 3 * W, input_file) != 3 * W)
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            return 1;
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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(input_file);
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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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  return 0;
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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 != 3) {
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        printf("usage: %s directory/ image.pnm\n"
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               "generate a test video stream\n", argv[0]);
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        return 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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    if (init_demo(argv[2]))
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        return 1;
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    for (i = 0; i < DEFAULT_NB_PICT; i++) {
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        snprintf(buf, sizeof(buf), "%s%02d.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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}