FFmpeg
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metadata.c
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1 /*
2  * copyright (c) 2009 Michael Niedermayer
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 "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 
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 }