1/*
2 * Metadata muxer
3 * Copyright (c) 2010 Anton Khirnov
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 <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    return 0;
58}
59
60static int write_trailer(AVFormatContext *s)
61{
62    int i;
63
64    write_tags(s->pb, s->metadata);
65
66    for (i = 0; i < s->nb_streams; i++) {
67        avio_write(s->pb, ID_STREAM, sizeof(ID_STREAM) - 1);
68        avio_w8(s->pb, '\n');
69        write_tags(s->pb, s->streams[i]->metadata);
70    }
71
72    for (i = 0; i < s->nb_chapters; i++) {
73        AVChapter *ch = s->chapters[i];
74        avio_write(s->pb, ID_CHAPTER, sizeof(ID_CHAPTER) - 1);
75        avio_w8(s->pb, '\n');
76        avio_printf(s->pb, "TIMEBASE=%d/%d\n", ch->time_base.num, ch->time_base.den);
77        avio_printf(s->pb, "START=%"PRId64"\n", ch->start);
78        avio_printf(s->pb, "END=%"PRId64"\n",   ch->end);
79        write_tags(s->pb, ch->metadata);
80    }
81
82    return 0;
83}
84
85static int write_packet(AVFormatContext *s, AVPacket *pkt)
86{
87    return 0;
88}
89
90const AVOutputFormat ff_ffmetadata_muxer = {
91    .name          = "ffmetadata",
92    .long_name     = NULL_IF_CONFIG_SMALL("FFmpeg metadata in text"),
93    .extensions    = "ffmeta",
94    .write_header  = write_header,
95    .write_packet  = write_packet,
96    .write_trailer = write_trailer,
97    .flags         = AVFMT_NOTIMESTAMPS | AVFMT_NOSTREAMS,
98};
99