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/*
* Generate a synthetic YUV video sequence suitable for codec testing.
*
* copyright (c) Sebastien Bechet <s.bechet@av7.net>
*
* This file is part of Libav.
*
* Libav 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.
*
* Libav 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 Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <stdlib.h>
#include <stdio.h>
#include <inttypes.h>
#include "utils.c"
#define FIXP (1 << 16)
#define MY_PI 205887 // (M_PI * FIX)
static int64_t int_pow(int64_t a, int p)
{
int64_t v = FIXP;
for (; p; p--) {
v *= a;
v /= FIXP;
}
return v;
}
static int64_t int_sin(int64_t a)
{
if (a < 0)
a = MY_PI - a; // 0..inf
a %= 2 * MY_PI; // 0..2PI
if (a >= MY_PI * 3 / 2)
a -= 2 * MY_PI; // -PI / 2 .. 3PI / 2
if (a >= MY_PI / 2)
a = MY_PI - a; // -PI / 2 .. PI / 2
return a - int_pow(a, 3) / 6 + int_pow(a, 5) / 120 - int_pow(a, 7) / 5040;
}
static unsigned char tab_r[256 * 256];
static unsigned char tab_g[256 * 256];
static unsigned char tab_b[256 * 256];
static int h_cos[360];
static int h_sin[360];
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;
}
static void gen_image(int num, int w, int h)
{
const int c = h_cos[num % 360];
const int s = h_sin[num % 360];
const int xi = -(w / 2) * c;
const int yi = (w / 2) * s;
const int xj = -(h / 2) * s;
const int yj = -(h / 2) * c;
int i, j;
int x, y;
int xprime = xj;
int yprime = yj;
for (j = 0; j < h; j++) {
x = xprime + xi + FIXP * w / 2;
xprime += s;
y = yprime + yi + FIXP * h / 2;
yprime += c;
for (i = 0; i < w; i++) {
x += c;
y -= s;
put_pixel(i, j,
ipol(tab_r, x, y),
ipol(tab_g, x, y),
ipol(tab_b, x, y));
}
}
}
#define W 256
#define H 256
static int init_demo(const char *filename)
{
int i, j;
int h;
int radian;
char line[3 * W];
FILE *input_file;
input_file = fopen(filename, "rb");
if (!input_file) {
perror(filename);
return 1;
}
if (fread(line, 1, 15, input_file) != 15)
return 1;
for (i = 0; i < H; i++) {
if (fread(line, 1, 3 * W, input_file) != 3 * W)
return 1;
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];
}
}
fclose(input_file);
/* tables sin/cos */
for (i = 0; i < 360; i++) {
radian = 2 * i * MY_PI / 360;
h = 2 * FIXP + int_sin(radian);
h_cos[i] = h * int_sin(radian + MY_PI / 2) / 2 / FIXP;
h_sin[i] = h * int_sin(radian) / 2 / FIXP;
}
return 0;
}
int main(int argc, char **argv)
{
int w, h, i;
char buf[1024];
int isdir = 0;
if (argc != 3) {
printf("usage: %s image.pnm file|dir\n"
"generate a test video stream\n", argv[0]);
return 1;
}
if (!freopen(argv[2], "wb", stdout))
isdir = 1;
w = DEFAULT_WIDTH;
h = DEFAULT_HEIGHT;
rgb_tab = malloc(w * h * 3);
wrap = w * 3;
width = w;
height = h;
if (init_demo(argv[1]))
return 1;
for (i = 0; i < DEFAULT_NB_PICT; i++) {
gen_image(i, w, h);
if (isdir) {
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);
}
}
free(rgb_tab);
return 0;
}
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