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vorbiscomment.c
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1 /*
2  * VorbisComment writer
3  * Copyright (c) 2009 James Darnley
4  *
5  * This file is part of FFmpeg.
6  *
7  * FFmpeg is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * FFmpeg is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with FFmpeg; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
22 #include "avformat.h"
23 #include "metadata.h"
24 #include "vorbiscomment.h"
25 #include "libavcodec/bytestream.h"
26 #include "libavutil/dict.h"
27 
28 /**
29  * VorbisComment metadata conversion mapping.
30  * from Ogg Vorbis I format specification: comment field and header specification
31  * http://xiph.org/vorbis/doc/v-comment.html
32  */
34  { "ALBUMARTIST", "album_artist"},
35  { "TRACKNUMBER", "track" },
36  { "DISCNUMBER", "disc" },
37  { "DESCRIPTION", "comment" },
38  { 0 }
39 };
40 
41 int ff_vorbiscomment_length(AVDictionary *m, const char *vendor_string,
42  unsigned *count)
43 {
44  int len = 8;
45  len += strlen(vendor_string);
46  *count = 0;
47  if (m) {
48  AVDictionaryEntry *tag = NULL;
49  while ((tag = av_dict_get(m, "", tag, AV_DICT_IGNORE_SUFFIX))) {
50  len += 4 +strlen(tag->key) + 1 + strlen(tag->value);
51  (*count)++;
52  }
53  }
54  return len;
55 }
56 
58  const char *vendor_string, const unsigned count)
59 {
60  bytestream_put_le32(p, strlen(vendor_string));
61  bytestream_put_buffer(p, vendor_string, strlen(vendor_string));
62  if (*m) {
63  AVDictionaryEntry *tag = NULL;
64  bytestream_put_le32(p, count);
65  while ((tag = av_dict_get(*m, "", tag, AV_DICT_IGNORE_SUFFIX))) {
66  unsigned int len1 = strlen(tag->key);
67  unsigned int len2 = strlen(tag->value);
68  bytestream_put_le32(p, len1+1+len2);
69  bytestream_put_buffer(p, tag->key, len1);
70  bytestream_put_byte(p, '=');
71  bytestream_put_buffer(p, tag->value, len2);
72  }
73  } else
74  bytestream_put_le32(p, 0);
75  return 0;
76 }