Skip to content
Fetching contributors…
Cannot retrieve contributors at this time
307 lines (257 sloc) 7.55 KB
/*
* Generates 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>
#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;
}
#define SCALEBITS 8
#define ONE_HALF (1 << (SCALEBITS - 1))
#define FIX(x) ((int) ((x) * (1L << SCALEBITS) + 0.5))
static void rgb24_to_yuv420p(unsigned char *lum, unsigned char *cb,
unsigned char *cr, unsigned char *src,
int width, int height)
{
int wrap, wrap3, x, y;
int r, g, b, r1, g1, b1;
unsigned char *p;
wrap = width;
wrap3 = width * 3;
p = src;
for (y = 0; y < height; y += 2) {
for (x = 0; x < width; x += 2) {
r = p[0];
g = p[1];
b = p[2];
r1 = r;
g1 = g;
b1 = b;
lum[0] = (FIX(0.29900) * r + FIX(0.58700) * g +
FIX(0.11400) * b + ONE_HALF) >> SCALEBITS;
r = p[3];
g = p[4];
b = p[5];
r1 += r;
g1 += g;
b1 += b;
lum[1] = (FIX(0.29900) * r + FIX(0.58700) * g +
FIX(0.11400) * b + ONE_HALF) >> SCALEBITS;
p += wrap3;
lum += wrap;
r = p[0];
g = p[1];
b = p[2];
r1 += r;
g1 += g;
b1 += b;
lum[0] = (FIX(0.29900) * r + FIX(0.58700) * g +
FIX(0.11400) * b + ONE_HALF) >> SCALEBITS;
r = p[3];
g = p[4];
b = p[5];
r1 += r;
g1 += g;
b1 += b;
lum[1] = (FIX(0.29900) * r + FIX(0.58700) * g +
FIX(0.11400) * b + ONE_HALF) >> SCALEBITS;
cb[0] = ((- FIX(0.16874) * r1 - FIX(0.33126) * g1 +
FIX(0.50000) * b1 + 4 * ONE_HALF - 1) >> (SCALEBITS + 2)) + 128;
cr[0] = ((FIX(0.50000) * r1 - FIX(0.41869) * g1 -
FIX(0.08131) * b1 + 4 * ONE_HALF - 1) >> (SCALEBITS + 2)) + 128;
cb++;
cr++;
p += -wrap3 + 2 * 3;
lum += -wrap + 2;
}
p += wrap3;
lum += wrap;
}
}
/* cif format */
#define DEFAULT_WIDTH 352
#define DEFAULT_HEIGHT 288
#define DEFAULT_NB_PICT 50
static void pgmyuv_save(const char *filename, int w, int h,
unsigned char *rgb_tab)
{
FILE *f;
int i, h2, w2;
unsigned char *cb, *cr;
unsigned char *lum_tab, *cb_tab, *cr_tab;
lum_tab = malloc(w * h);
cb_tab = malloc(w * h / 4);
cr_tab = malloc(w * h / 4);
rgb24_to_yuv420p(lum_tab, cb_tab, cr_tab, rgb_tab, w, h);
f = fopen(filename, "wb");
fprintf(f, "P5\n%d %d\n%d\n", w, h * 3 / 2, 255);
fwrite(lum_tab, 1, w * h, f);
h2 = h / 2;
w2 = w / 2;
cb = cb_tab;
cr = cr_tab;
for (i = 0; i < h2; i++) {
fwrite(cb, 1, w2, f);
fwrite(cr, 1, w2, f);
cb += w2;
cr += w2;
}
fclose(f);
free(lum_tab);
free(cb_tab);
free(cr_tab);
}
unsigned char *rgb_tab;
int width, height, wrap;
static void put_pixel(int x, int y, int r, int g, int b)
{
unsigned char *p;
if (x < 0 || x >= width ||
y < 0 || y >= height)
return;
p = rgb_tab + y * wrap + x * 3;
p[0] = r;
p[1] = g;
p[2] = b;
}
unsigned char tab_r[256 * 256];
unsigned char tab_g[256 * 256];
unsigned char tab_b[256 * 256];
int h_cos [360];
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];
if (argc != 3) {
printf("usage: %s directory/ image.pnm\n"
"generate a test video stream\n", argv[0]);
return 1;
}
w = DEFAULT_WIDTH;
h = DEFAULT_HEIGHT;
rgb_tab = malloc(w * h * 3);
wrap = w * 3;
width = w;
height = h;
if (init_demo(argv[2]))
return 1;
for (i = 0; i < DEFAULT_NB_PICT; i++) {
snprintf(buf, sizeof(buf), "%s%02d.pgm", argv[1], i);
gen_image(i, w, h);
pgmyuv_save(buf, w, h, rgb_tab);
}
free(rgb_tab);
return 0;
}
Something went wrong with that request. Please try again.