FFmpeg/libavcodec/remove_extradata_bsf.c

/*
 * copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
 *
 * 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 "avcodec.h"


static int remove_extradata(AVBitStreamFilterContext *bsfc, AVCodecContext *avctx, const char *args,
                     uint8_t **poutbuf, int *poutbuf_size,
                     const uint8_t *buf, int buf_size, int keyframe){
    int cmd= args ? *args : 0;
    AVCodecParserContext *s;

    if(!bsfc->parser){
        bsfc->parser= av_parser_init(avctx->codec_id);
    }
    s= bsfc->parser;

    if(s && s->parser->split){
        if(  (((avctx->flags & AV_CODEC_FLAG_GLOBAL_HEADER) ||
               (avctx->flags2 & AV_CODEC_FLAG2_LOCAL_HEADER)) && cmd == 'a')
           ||(!keyframe && cmd=='k')
           ||(cmd=='e' || !cmd)
          ){
            int i= s->parser->split(avctx, buf, buf_size);
            buf += i;
            buf_size -= i;
        }
    }
    *poutbuf= (uint8_t *) buf;
    *poutbuf_size= buf_size;

    return 0;
}

AVBitStreamFilter ff_remove_extradata_bsf={
    .name   = "remove_extra",
    .filter = remove_extradata,
};