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  1. /*
  2.  * copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
  3.  *
  4.  * This file is part of FFmpeg.
  5.  *
  6.  * FFmpeg is free software; you can redistribute it and/or
  7.  * modify it under the terms of the GNU Lesser General Public
  8.  * License as published by the Free Software Foundation; either
  9.  * version 2.1 of the License, or (at your option) any later version.
  10.  *
  11.  * FFmpeg is distributed in the hope that it will be useful,
  12.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14.  * Lesser General Public License for more details.
  15.  *
  16.  * You should have received a copy of the GNU Lesser General Public
  17.  * License along with FFmpeg; if not, write to the Free Software
  18.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  19.  */
  20.  
  21. #include <string.h>
  22.  
  23. #include "avcodec.h"
  24. #include "libavutil/atomic.h"
  25. #include "libavutil/mem.h"
  26.  
  27. static AVBitStreamFilter *first_bitstream_filter = NULL;
  28.  
  29. AVBitStreamFilter *av_bitstream_filter_next(const AVBitStreamFilter *f)
  30. {
  31.     if (f)
  32.         return f->next;
  33.     else
  34.         return first_bitstream_filter;
  35. }
  36.  
  37. void av_register_bitstream_filter(AVBitStreamFilter *bsf)
  38. {
  39.     do {
  40.         bsf->next = first_bitstream_filter;
  41.     } while(bsf->next != avpriv_atomic_ptr_cas((void * volatile *)&first_bitstream_filter, bsf->next, bsf));
  42. }
  43.  
  44. AVBitStreamFilterContext *av_bitstream_filter_init(const char *name)
  45. {
  46.     AVBitStreamFilter *bsf = NULL;
  47.  
  48.     while (bsf = av_bitstream_filter_next(bsf)) {
  49.         if (!strcmp(name, bsf->name)) {
  50.             AVBitStreamFilterContext *bsfc =
  51.                 av_mallocz(sizeof(AVBitStreamFilterContext));
  52.             if (!bsfc)
  53.                 return NULL;
  54.             bsfc->filter    = bsf;
  55.             bsfc->priv_data = NULL;
  56.             if (bsf->priv_data_size) {
  57.                 bsfc->priv_data = av_mallocz(bsf->priv_data_size);
  58.                 if (!bsfc->priv_data) {
  59.                     av_freep(&bsfc);
  60.                     return NULL;
  61.                 }
  62.             }
  63.             return bsfc;
  64.         }
  65.     }
  66.     return NULL;
  67. }
  68.  
  69. void av_bitstream_filter_close(AVBitStreamFilterContext *bsfc)
  70. {
  71.     if (!bsfc)
  72.         return;
  73.     if (bsfc->filter->close)
  74.         bsfc->filter->close(bsfc);
  75.     av_freep(&bsfc->priv_data);
  76.     av_parser_close(bsfc->parser);
  77.     av_free(bsfc);
  78. }
  79.  
  80. int av_bitstream_filter_filter(AVBitStreamFilterContext *bsfc,
  81.                                AVCodecContext *avctx, const char *args,
  82.                                uint8_t **poutbuf, int *poutbuf_size,
  83.                                const uint8_t *buf, int buf_size, int keyframe)
  84. {
  85.     *poutbuf      = (uint8_t *)buf;
  86.     *poutbuf_size = buf_size;
  87.     return bsfc->filter->filter(bsfc, avctx, args, poutbuf, poutbuf_size,
  88.                                 buf, buf_size, keyframe);
  89. }
  90.