Main Page
Related Pages
Modules
Data Structures
Files
Examples
File List
Globals
libavcodec
noise_bsf.c
Go to the documentation of this file.
1
/*
2
* copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
3
*
4
* This file is part of Libav.
5
*
6
* Libav is free software; you can redistribute it and/or
7
* modify it under the terms of the GNU Lesser General Public
8
* License as published by the Free Software Foundation; either
9
* version 2.1 of the License, or (at your option) any later version.
10
*
11
* Libav is distributed in the hope that it will be useful,
12
* but WITHOUT ANY WARRANTY; without even the implied warranty of
13
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14
* Lesser General Public License for more details.
15
*
16
* You should have received a copy of the GNU Lesser General Public
17
* License along with Libav; if not, write to the Free Software
18
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19
*/
20
21
#include "
avcodec.h
"
22
23
24
static
int
noise
(
AVBitStreamFilterContext
*bsfc,
AVCodecContext
*avctx,
const
char
*args,
25
uint8_t **poutbuf,
int
*poutbuf_size,
26
const
uint8_t *buf,
int
buf_size,
int
keyframe){
27
unsigned
int
*
state
= bsfc->
priv_data
;
28
int
amount= args ? atoi(args) : (*state % 10001+1);
29
int
i;
30
31
*poutbuf=
av_malloc
(buf_size +
FF_INPUT_BUFFER_PADDING_SIZE
);
32
33
memcpy(*poutbuf, buf, buf_size +
FF_INPUT_BUFFER_PADDING_SIZE
);
34
for
(i=0; i<buf_size; i++){
35
(*state) += (*poutbuf)[i] + 1;
36
if
(*state % amount == 0)
37
(*poutbuf)[i] = *
state
;
38
}
39
return
1;
40
}
41
42
AVBitStreamFilter
ff_noise_bsf
={
43
"noise"
,
44
sizeof
(int),
45
noise
,
46
};