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/* |
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* Generate a synthetic YUV video sequence suitable for codec testing. |
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*
* copyright (c) Sebastien Bechet <s.bechet@av7.net>
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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|
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#include <stdlib.h>
#include <stdio.h> |
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#include <inttypes.h>
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#include "utils.c"
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#define FIXP (1 << 16) |
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#define MY_PI 205887 // (M_PI * FIX) |
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|
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static int64_t int_pow(int64_t a, int p)
{
int64_t v = FIXP; |
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|
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for (; p; p--) {
v *= a;
v /= FIXP; |
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}
return v;
}
|
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static int64_t int_sin(int64_t a)
{
if (a < 0)
a = MY_PI - a; // 0..inf
a %= 2 * MY_PI; // 0..2PI |
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|
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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) |
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a = MY_PI - a; // -PI / 2 .. PI / 2 |
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|
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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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|
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static unsigned char tab_r[256 * 256];
static unsigned char tab_g[256 * 256];
static unsigned char tab_b[256 * 256]; |
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|
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static int h_cos[360];
static int h_sin[360]; |
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|
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static int ipol(uint8_t *src, int x, int y)
{
int int_x = x >> 16;
int int_y = y >> 16;
int frac_x = x & 0xFFFF;
int frac_y = y & 0xFFFF;
int s00 = src[( int_x & 255) + 256 * ( int_y & 255)];
int s01 = src[((int_x + 1) & 255) + 256 * ( int_y & 255)];
int s10 = src[( int_x & 255) + 256 * ((int_y + 1) & 255)];
int s11 = src[((int_x + 1) & 255) + 256 * ((int_y + 1) & 255)];
int s0 = (((1 << 16) - frac_x) * s00 + frac_x * s01) >> 8;
int s1 = (((1 << 16) - frac_x) * s10 + frac_x * s11) >> 8;
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];
const int s = h_sin[num % 360]; |
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|
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const int xi = -(w / 2) * c;
const int yi = (w / 2) * s; |
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const int xj = -(h / 2) * s;
const int yj = -(h / 2) * c;
int i, j; |
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int x, y;
int xprime = xj;
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;
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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#define W 256
#define H 256
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static int init_demo(const char *filename) |
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{
int i, j;
int h;
int radian;
char line[3 * W];
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FILE *input_file; |
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input_file = fopen(filename, "rb");
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++) {
tab_r[W * i + j] = line[3 * j ];
tab_g[W * i + j] = line[3 * j + 1];
tab_b[W * i + j] = line[3 * j + 2];
}
} |
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fclose(input_file); |
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/* tables sin/cos */
for (i = 0; i < 360; i++) { |
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radian = 2 * i * MY_PI / 360;
h = 2 * FIXP + int_sin(radian); |
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h_cos[i] = h * int_sin(radian + MY_PI / 2) / 2 / FIXP;
h_sin[i] = h * int_sin(radian) / 2 / FIXP; |
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} |
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|
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return 0; |
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}
int main(int argc, char **argv)
{
int w, h, i;
char buf[1024]; |
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int isdir = 0; |
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|
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if (argc != 3) {
printf("usage: %s image.pnm file|dir\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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if (!freopen(argv[2], "wb", stdout))
isdir = 1; |
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w = DEFAULT_WIDTH;
h = DEFAULT_HEIGHT;
rgb_tab = malloc(w * h * 3); |
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wrap = w * 3;
width = w;
height = h; |
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if (init_demo(argv[1])) |
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return 1; |
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for (i = 0; i < DEFAULT_NB_PICT; i++) { |
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gen_image(i, w, h); |
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if (isdir) { |
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snprintf(buf, sizeof(buf), "%s%02d.pgm", argv[2], i);
pgmyuv_save(buf, w, h, rgb_tab);
} else {
pgmyuv_save(NULL, w, h, rgb_tab);
} |
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} |
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|
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free(rgb_tab);
return 0;
} |