0,0 → 1,55 |
/* |
* 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, |
}; |