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libavcodec/noise_bsf.c

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00001 /*
00002  * copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
00003  *
00004  * This file is part of FFmpeg.
00005  *
00006  * FFmpeg is free software; you can redistribute it and/or
00007  * modify it under the terms of the GNU Lesser General Public
00008  * License as published by the Free Software Foundation; either
00009  * version 2.1 of the License, or (at your option) any later version.
00010  *
00011  * FFmpeg is distributed in the hope that it will be useful,
00012  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00013  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00014  * Lesser General Public License for more details.
00015  *
00016  * You should have received a copy of the GNU Lesser General Public
00017  * License along with FFmpeg; if not, write to the Free Software
00018  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00019  */
00020 
00021 #include "avcodec.h"
00022 
00023 
00024 static int noise(AVBitStreamFilterContext *bsfc, AVCodecContext *avctx, const char *args,
00025                      uint8_t **poutbuf, int *poutbuf_size,
00026                      const uint8_t *buf, int buf_size, int keyframe){
00027     unsigned int *state= bsfc->priv_data;
00028     int amount= args ? atoi(args) : (*state % 10001+1);
00029     int i;
00030 
00031     *poutbuf= av_malloc(buf_size + FF_INPUT_BUFFER_PADDING_SIZE);
00032 
00033     memcpy(*poutbuf, buf, buf_size + FF_INPUT_BUFFER_PADDING_SIZE);
00034     for(i=0; i<buf_size; i++){
00035         (*state) += (*poutbuf)[i] + 1;
00036         if(*state % amount == 0)
00037             (*poutbuf)[i] = *state;
00038     }
00039     return 1;
00040 }
00041 
00042 AVBitStreamFilter noise_bsf={
00043     "noise",
00044     sizeof(int),
00045     noise,
00046 };

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