mirror of
https://gitee.com/openharmony/third_party_ffmpeg
synced 2024-11-24 11:49:48 +00:00
56 lines
1.7 KiB
C
56 lines
1.7 KiB
C
/*
|
|
* copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
|
|
*
|
|
* This file is part of FFmpeg.
|
|
*
|
|
* FFmpeg 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.
|
|
*
|
|
* FFmpeg 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 FFmpeg; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
|
|
#include "avcodec.h"
|
|
#include "libavutil/mem.h"
|
|
|
|
|
|
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){
|
|
unsigned int *state= bsfc->priv_data;
|
|
int amount= args ? atoi(args) : (*state % 10001+1);
|
|
int i;
|
|
|
|
if(amount <= 0)
|
|
return AVERROR(EINVAL);
|
|
|
|
*poutbuf= av_malloc(buf_size + FF_INPUT_BUFFER_PADDING_SIZE);
|
|
if (!*poutbuf)
|
|
return AVERROR(ENOMEM);
|
|
|
|
memcpy(*poutbuf, buf, buf_size + FF_INPUT_BUFFER_PADDING_SIZE);
|
|
for(i=0; i<buf_size; i++){
|
|
(*state) += (*poutbuf)[i] + 1;
|
|
if(*state % amount == 0)
|
|
(*poutbuf)[i] = *state;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
AVBitStreamFilter ff_noise_bsf={
|
|
.name = "noise",
|
|
.priv_data_size = sizeof(int),
|
|
.filter = noise,
|
|
};
|