git.sesse.net Git - ffmpeg/blob - libavcodec/bitstream_filter.c

   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 }