libavformat/metadata.c

   1 /*
   2  * copyright (c) 2009 Michael Niedermayer
   3  *
   4  * This file is part of Libav.
   5  *
   6  * Libav 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  * Libav 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 Libav; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  19  */
  20
  21 #include "avformat.h"
  22 #include "metadata.h"
  23 #include "libavutil/dict.h"
  24 #include "libavutil/avstring.h"
  25
  26 void ff_metadata_conv(AVDictionary **pm, const AVMetadataConv *d_conv,
  27                                        const AVMetadataConv *s_conv)
  28 {
  29     /* TODO: use binary search to look up the two conversion tables
  30        if the tables are getting big enough that it would matter speed wise */
  31     const AVMetadataConv *sc, *dc;
  32     AVDictionaryEntry *mtag = NULL;
  33     AVDictionary *dst = NULL;
  34     const char *key;
  35
  36     if (d_conv == s_conv)
  37         return;
  38
  39     while ((mtag = av_dict_get(*pm, "", mtag, AV_DICT_IGNORE_SUFFIX))) {
  40         key = mtag->key;
  41         if (s_conv)
  42             for (sc=s_conv; sc->native; sc++)
  43                 if (!av_strcasecmp(key, sc->native)) {
  44                     key = sc->generic;
  45                     break;
  46                 }
  47         if (d_conv)
  48             for (dc=d_conv; dc->native; dc++)
  49                 if (!av_strcasecmp(key, dc->generic)) {
  50                     key = dc->native;
  51                     break;
  52                 }
  53         av_dict_set(&dst, key, mtag->value, 0);
  54     }
  55     av_dict_free(pm);
  56     *pm = dst;
  57 }
  58
  59 void ff_metadata_conv_ctx(AVFormatContext *ctx, const AVMetadataConv *d_conv,
  60                                                 const AVMetadataConv *s_conv)
  61 {
  62     int i;
  63     ff_metadata_conv(&ctx->metadata, d_conv, s_conv);
  64     for (i=0; i<ctx->nb_streams ; i++)
  65         ff_metadata_conv(&ctx->streams [i]->metadata, d_conv, s_conv);
  66     for (i=0; i<ctx->nb_chapters; i++)
  67         ff_metadata_conv(&ctx->chapters[i]->metadata, d_conv, s_conv);
  68     for (i=0; i<ctx->nb_programs; i++)
  69         ff_metadata_conv(&ctx->programs[i]->metadata, d_conv, s_conv);
  70 }