1/*
2 * VorbisComment writer
3 * Copyright (c) 2009 James Darnley
4 *
5 * This file is part of Libav.
6 *
7 * Libav 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 * Libav 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 Libav; 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 */
33const AVMetadataConv ff_vorbiscomment_metadata_conv[] = {
34    { "ALBUMARTIST", "album_artist"},
35    { "TRACKNUMBER", "track"  },
36    { "DISCNUMBER",  "disc"   },
37    { 0 }
38};
39
40int ff_vorbiscomment_length(AVDictionary *m, const char *vendor_string,
41                            unsigned *count)
42{
43    int len = 8;
44    len += strlen(vendor_string);
45    *count = 0;
46    if (m) {
47        AVDictionaryEntry *tag = NULL;
48        while ((tag = av_dict_get(m, "", tag, AV_DICT_IGNORE_SUFFIX))) {
49            len += 4 +strlen(tag->key) + 1 + strlen(tag->value);
50            (*count)++;
51        }
52    }
53    return len;
54}
55
56int ff_vorbiscomment_write(uint8_t **p, AVDictionary **m,
57                           const char *vendor_string, const unsigned count)
58{
59    bytestream_put_le32(p, strlen(vendor_string));
60    bytestream_put_buffer(p, vendor_string, strlen(vendor_string));
61    if (*m) {
62        AVDictionaryEntry *tag = NULL;
63        bytestream_put_le32(p, count);
64        while ((tag = av_dict_get(*m, "", tag, AV_DICT_IGNORE_SUFFIX))) {
65            unsigned int len1 = strlen(tag->key);
66            unsigned int len2 = strlen(tag->value);
67            bytestream_put_le32(p, len1+1+len2);
68            bytestream_put_buffer(p, tag->key, len1);
69            bytestream_put_byte(p, '=');
70            bytestream_put_buffer(p, tag->value, len2);
71        }
72    } else
73        bytestream_put_le32(p, 0);
74    return 0;
75}
76