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libavcodec
noise_bsf.c
Go to the documentation of this file.
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/*
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* copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
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*
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* This file is part of Libav.
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*
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* Libav is free software; you can redistribute it and/or
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* 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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* Libav 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 Libav; 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 <string.h>
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#include "
avcodec.h
"
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#include "
libavutil/mem.h
"
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static
int
noise
(
AVBitStreamFilterContext
*bsfc,
AVCodecContext
*avctx,
const
char
*args,
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uint8_t
**poutbuf,
int
*poutbuf_size,
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const
uint8_t
*buf,
int
buf_size,
int
keyframe){
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unsigned
int
*
state
= bsfc->
priv_data
;
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int
amount= args ? atoi(args) : (*state % 10001+1);
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int
i;
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*poutbuf=
av_malloc
(buf_size +
FF_INPUT_BUFFER_PADDING_SIZE
);
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memcpy(*poutbuf, buf, buf_size +
FF_INPUT_BUFFER_PADDING_SIZE
);
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for
(i=0; i<buf_size; i++){
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(*state) += (*poutbuf)[i] + 1;
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if
(*state % amount == 0)
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(*poutbuf)[i] = *
state
;
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}
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return
1;
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}
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AVBitStreamFilter
ff_noise_bsf
={
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"noise"
,
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sizeof
(int),
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noise
,
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};
av_malloc
void * av_malloc(size_t size)
Allocate a block of size bytes with alignment suitable for all memory accesses (including vectors if ...
Definition:
mem.c:62
mem.h
memory handling functions
uint8_t
uint8_t
Definition:
audio_convert.c:194
AVBitStreamFilter
Definition:
avcodec.h:4296
AVBitStreamFilterContext::priv_data
void * priv_data
Definition:
avcodec.h:4289
FF_INPUT_BUFFER_PADDING_SIZE
#define FF_INPUT_BUFFER_PADDING_SIZE
Required number of additionally allocated bytes at the end of the input bitstream for decoding...
Definition:
avcodec.h:531
AVBitStreamFilterContext
Definition:
avcodec.h:4288
noise
static int noise(AVBitStreamFilterContext *bsfc, AVCodecContext *avctx, const char *args, uint8_t **poutbuf, int *poutbuf_size, const uint8_t *buf, int buf_size, int keyframe)
Definition:
noise_bsf.c:28
avcodec.h
Libavcodec external API header.
AVCodecContext
main external API structure.
Definition:
avcodec.h:1050
state
static uint32_t state
Definition:
trasher.c:27
ff_noise_bsf
AVBitStreamFilter ff_noise_bsf
Definition:
noise_bsf.c:46
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