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tests
videogen.c
Go to the documentation of this file.
1
/*
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* Generate a synthetic YUV video sequence suitable for codec testing.
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* NOTE: No floats are used to guarantee bitexact output.
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*
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* Copyright (c) 2002 Fabrice Bellard
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
10
* 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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* FFmpeg 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 FFmpeg; 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 <stdint.h>
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#include <stdio.h>
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#include "
utils.c
"
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static
unsigned
int
myrnd
(
unsigned
int
*seed_ptr,
int
n)
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{
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unsigned
int
seed
, val;
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seed = *seed_ptr;
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seed = (seed * 314159) + 1;
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if
(n == 256) {
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val = seed >> 24;
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}
else
{
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val = seed % n;
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}
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*seed_ptr =
seed
;
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return
val;
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}
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#define NOISE_X 10
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#define NOISE_Y 30
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#define NOISE_W 26
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#define FRAC_BITS 8
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#define FRAC_ONE (1 << FRAC_BITS)
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/* cosine approximate with 1-x^2 */
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static
int
int_cos
(
int
a
)
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{
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int
v
, neg;
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a = a & (
FRAC_ONE
- 1);
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if
(a >= (
FRAC_ONE
/ 2))
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a =
FRAC_ONE
- a;
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neg = 0;
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if
(a > (
FRAC_ONE
/ 4)) {
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neg = -1;
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a = (
FRAC_ONE
/ 2) - a;
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}
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v =
FRAC_ONE
- ((a *
a
) >> 4);
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v = (v ^ neg) - neg;
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return
v
;
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}
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#define NB_OBJS 10
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typedef
struct
VObj
{
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int
x
,
y
,
w
,
h
;
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int
r
,
g
,
b
;
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}
VObj
;
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static
VObj
objs
[
NB_OBJS
];
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static
unsigned
int
seed
= 1;
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static
void
gen_image
(
int
num,
int
w,
int
h)
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{
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int
r
,
g
,
b
, x,
y
, i, dx, dy, x1, y1;
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unsigned
int
seed1;
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if
(num == 0) {
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for
(i = 0; i <
NB_OBJS
; i++) {
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objs[i].
x
=
myrnd
(&
seed
, w);
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objs[i].
y
=
myrnd
(&
seed
, h);
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objs[i].
w
=
myrnd
(&
seed
, w / 4) + 10;
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objs[i].
h
=
myrnd
(&
seed
, h / 4) + 10;
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objs[i].
r
=
myrnd
(&
seed
, 256);
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objs[i].
g
=
myrnd
(&
seed
, 256);
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objs[i].
b
=
myrnd
(&
seed
, 256);
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}
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}
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/* first a moving background with gradients */
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/* test motion estimation */
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dx =
int_cos
(num *
FRAC_ONE
/ 50) * 35;
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dy =
int_cos
(num *
FRAC_ONE
/ 50 +
FRAC_ONE
/ 10) * 30;
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for
(y = 0; y < h; y++) {
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for
(x = 0; x < w; x++) {
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x1 = (x <<
FRAC_BITS
) + dx;
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y1 = (y <<
FRAC_BITS
) + dy;
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r = ((y1 * 7) >>
FRAC_BITS
) & 0xff;
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g = (((x1 + y1) * 9) >>
FRAC_BITS
) & 0xff;
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b = ((x1 * 5) >>
FRAC_BITS
) & 0xff;
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put_pixel
(x, y, r, g, b);
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}
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}
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/* then some noise with very high intensity to test saturation */
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seed1 = num;
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for
(y = 0; y <
NOISE_W
; y++) {
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for
(x = 0; x <
NOISE_W
; x++) {
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r =
myrnd
(&seed1, 256);
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g =
myrnd
(&seed1, 256);
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b =
myrnd
(&seed1, 256);
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put_pixel
(x +
NOISE_X
, y +
NOISE_Y
, r, g, b);
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}
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}
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/* then moving objects */
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for
(i = 0; i <
NB_OBJS
; i++) {
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VObj
*p = &objs[i];
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seed1 = i;
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for
(y = 0; y < p->
h
; y++) {
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for
(x = 0; x < p->
w
; x++) {
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r = p->
r
;
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g = p->
g
;
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b = p->
b
;
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/* add a per object noise */
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r +=
myrnd
(&seed1, 50);
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g +=
myrnd
(&seed1, 50);
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b +=
myrnd
(&seed1, 50);
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put_pixel
(x + p->
x
, y + p->
y
, r, g, b);
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}
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}
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p->
x
+=
myrnd
(&
seed
, 21) - 10;
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p->
y
+=
myrnd
(&
seed
, 21) - 10;
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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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int
isdir = 0;
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if
(argc != 2) {
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printf(
"usage: %s file|dir\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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if
(!freopen(argv[1],
"wb"
, stdout))
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isdir = 1;
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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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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[1], i);
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pgmyuv_save
(buf, w, h,
rgb_tab
);
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}
else
{
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pgmyuv_save
(
NULL
, w, h,
rgb_tab
);
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}
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}
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free(
rgb_tab
);
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return
0;
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}
Generated on Sat May 25 2013 04:01:22 for FFmpeg by
1.8.2