56 lines
1.7 KiB
C
56 lines
1.7 KiB
C
/*
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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 FFmpeg.
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*
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* FFmpeg 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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* FFmpeg 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 FFmpeg; 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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if(amount <= 0)
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return AVERROR(EINVAL);
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*poutbuf= av_malloc(buf_size + FF_INPUT_BUFFER_PADDING_SIZE);
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if (!*poutbuf)
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return AVERROR(ENOMEM);
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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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.name = "noise",
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.priv_data_size = sizeof(int),
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.filter = noise,
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};
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