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/*

 * copyright (c) 2006 Michael Niedermayer 

 *

 * 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 

#include 

#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

        (*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,

};