metadata.c
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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 #if FF_API_OLD_METADATA2
28 av_metadata_get(AVDictionary *m, const char *key, const AVDictionaryEntry *prev, int flags)
29 {
30  return av_dict_get(m, key, prev, flags);
31 }
32 
33 int av_metadata_set2(AVDictionary **pm, const char *key, const char *value, int flags)
34 {
35  return av_dict_set(pm, key, value, flags);
36 }
37 
38 void av_metadata_conv(AVFormatContext *ctx, const AVMetadataConv *d_conv,
39  const AVMetadataConv *s_conv)
40 {
41  return;
42 }
43 
44 void av_metadata_free(AVDictionary **pm)
45 {
46  av_dict_free(pm);
47 }
48 
49 void av_metadata_copy(AVDictionary **dst, AVDictionary *src, int flags)
50 {
51  av_dict_copy(dst, src, flags);
52 }
53 #endif
54 
55 void ff_metadata_conv(AVDictionary **pm, const AVMetadataConv *d_conv,
56  const AVMetadataConv *s_conv)
57 {
58  /* TODO: use binary search to look up the two conversion tables
59  if the tables are getting big enough that it would matter speed wise */
60  const AVMetadataConv *sc, *dc;
61  AVDictionaryEntry *mtag = NULL;
62  AVDictionary *dst = NULL;
63  const char *key;
64 
65  if (d_conv == s_conv)
66  return;
67 
68  while ((mtag = av_dict_get(*pm, "", mtag, AV_DICT_IGNORE_SUFFIX))) {
69  key = mtag->key;
70  if (s_conv)
71  for (sc=s_conv; sc->native; sc++)
72  if (!av_strcasecmp(key, sc->native)) {
73  key = sc->generic;
74  break;
75  }
76  if (d_conv)
77  for (dc=d_conv; dc->native; dc++)
78  if (!av_strcasecmp(key, dc->generic)) {
79  key = dc->native;
80  break;
81  }
82  av_dict_set(&dst, key, mtag->value, 0);
83  }
84  av_dict_free(pm);
85  *pm = dst;
86 }
87 
89  const AVMetadataConv *s_conv)
90 {
91  int i;
92  ff_metadata_conv(&ctx->metadata, d_conv, s_conv);
93  for (i=0; i<ctx->nb_streams ; i++)
94  ff_metadata_conv(&ctx->streams [i]->metadata, d_conv, s_conv);
95  for (i=0; i<ctx->nb_chapters; i++)
96  ff_metadata_conv(&ctx->chapters[i]->metadata, d_conv, s_conv);
97  for (i=0; i<ctx->nb_programs; i++)
98  ff_metadata_conv(&ctx->programs[i]->metadata, d_conv, s_conv);
99 }
100