Libav 0.7.1
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00001 /* 00002 * copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at> 00003 * 00004 * This file is part of Libav. 00005 * 00006 * Libav 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 * Libav 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 Libav; 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 ff_noise_bsf={ 00043 "noise", 00044 sizeof(int), 00045 noise, 00046 };