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50 lines
1.6 KiB
50 lines
1.6 KiB
/* |
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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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*poutbuf= av_malloc(buf_size + FF_INPUT_BUFFER_PADDING_SIZE); |
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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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"noise", |
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sizeof(int), |
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noise, |
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};
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