1/*
2 * Metadata muxer
3 * Copyright (c) 2010 Anton Khirnov
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 <inttypes.h>
23
24#include "avformat.h"
25#include "ffmeta.h"
26#include "libavutil/dict.h"
27
28
29static void write_escape_str(AVIOContext *s, const uint8_t *str)
30{
31    const uint8_t *p = str;
32
33    while (*p) {
34        if (*p == '#' || *p == ';' || *p == '=' || *p == '\\' || *p == '\n')
35            avio_w8(s, '\\');
36        avio_w8(s, *p);
37        p++;
38    }
39}
40
41static void write_tags(AVIOContext *s, AVDictionary *m)
42{
43    AVDictionaryEntry *t = NULL;
44    while ((t = av_dict_get(m, "", t, AV_DICT_IGNORE_SUFFIX))) {
45        write_escape_str(s, t->key);
46        avio_w8(s, '=');
47        write_escape_str(s, t->value);
48        avio_w8(s, '\n');
49    }
50}
51
52static int write_header(AVFormatContext *s)
53{
54    avio_write(s->pb, ID_STRING, sizeof(ID_STRING) - 1);
55    avio_w8(s->pb, '1');          // version
56    avio_w8(s->pb, '\n');
57    avio_flush(s->pb);
58    return 0;
59}
60
61static int write_trailer(AVFormatContext *s)
62{
63    int i;
64
65    write_tags(s->pb, s->metadata);
66
67    for (i = 0; i < s->nb_streams; i++) {
68        avio_write(s->pb, ID_STREAM, sizeof(ID_STREAM) - 1);
69        avio_w8(s->pb, '\n');
70        write_tags(s->pb, s->streams[i]->metadata);
71    }
72
73    for (i = 0; i < s->nb_chapters; i++) {
74        AVChapter *ch = s->chapters[i];
75        avio_write(s->pb, ID_CHAPTER, sizeof(ID_CHAPTER) - 1);
76        avio_w8(s->pb, '\n');
77        avio_printf(s->pb, "TIMEBASE=%d/%d\n", ch->time_base.num, ch->time_base.den);
78        avio_printf(s->pb, "START=%"PRId64"\n", ch->start);
79        avio_printf(s->pb, "END=%"PRId64"\n",   ch->end);
80        write_tags(s->pb, ch->metadata);
81    }
82
83    avio_flush(s->pb);
84
85    return 0;
86}
87
88static int write_packet(AVFormatContext *s, AVPacket *pkt)
89{
90    return 0;
91}
92
93AVOutputFormat ff_ffmetadata_muxer = {
94    .name          = "ffmetadata",
95    .long_name     = NULL_IF_CONFIG_SMALL("FFmpeg metadata in text format"),
96    .extensions    = "ffmeta",
97    .write_header  = write_header,
98    .write_packet  = write_packet,
99    .write_trailer = write_trailer,
100    .flags         = AVFMT_NOTIMESTAMPS | AVFMT_NOSTREAMS,
101};
102