/*
  * 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 <string.h>
 

 #include "avcodec.h"

 #include "libavutil/atomic.h"

 #include "libavutil/mem.h"

 static AVBitStreamFilter *first_bitstream_filter = NULL;

 AVBitStreamFilter *av_bitstream_filter_next(const AVBitStreamFilter *f)

 {
     if (f)
         return f->next;
     else
         return first_bitstream_filter;

 }
 

 void av_register_bitstream_filter(AVBitStreamFilter *bsf)
 {

     do {
         bsf->next = first_bitstream_filter;
     } while(bsf->next != avpriv_atomic_ptr_cas((void * volatile *)&first_bitstream_filter, bsf->next, bsf));

 }
 

 AVBitStreamFilterContext *av_bitstream_filter_init(const char *name)
 {

     AVBitStreamFilter *bsf = NULL;

     while (bsf = av_bitstream_filter_next(bsf)) {

         if (!strcmp(name, bsf->name)) {
             AVBitStreamFilterContext *bsfc =
                 av_mallocz(sizeof(AVBitStreamFilterContext));

             if (!bsfc)
                 return NULL;

             bsfc->filter    = bsf;

             bsfc->priv_data = NULL;
             if (bsf->priv_data_size) {
                 bsfc->priv_data = av_mallocz(bsf->priv_data_size);
                 if (!bsfc->priv_data) {
                     av_freep(&bsfc);
                     return NULL;
                 }
             }

             return bsfc;
         }
     }
     return NULL;
 }
 

 void av_bitstream_filter_close(AVBitStreamFilterContext *bsfc)
 {

     if (!bsfc)
         return;

     if (bsfc->filter->close)

         bsfc->filter->close(bsfc);

     av_freep(&bsfc->priv_data);

     av_parser_close(bsfc->parser);
     av_free(bsfc);
 }
 
 int av_bitstream_filter_filter(AVBitStreamFilterContext *bsfc,
                                AVCodecContext *avctx, const char *args,

                                uint8_t **poutbuf, int *poutbuf_size,
                                const uint8_t *buf, int buf_size, int keyframe)
 {
     *poutbuf      = (uint8_t *)buf;
     *poutbuf_size = buf_size;
     return bsfc->filter->filter(bsfc, avctx, args, poutbuf, poutbuf_size,
                                 buf, buf_size, keyframe);

 }