FFmpeg
ffmetaenc.c
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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 
29 static 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 
42 {
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 
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 
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 
86 {
87  return 0;
88 }
89 
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,
98 };
unsigned int nb_chapters
Number of chapters in AVChapter array.
Definition: avformat.h:1584
#define ID_CHAPTER
Definition: ffmeta.h:26
#define NULL
Definition: coverity.c:32
Bytestream IO Context.
Definition: avio.h:161
int num
Numerator.
Definition: rational.h:59
static AVPacket pkt
AVDictionary * metadata
Definition: avformat.h:1316
Format I/O context.
Definition: avformat.h:1355
Public dictionary API.
uint8_t
AVOutputFormat ff_ffmetadata_muxer
Definition: ffmetaenc.c:90
#define ID_STRING
Definition: ffmeta.h:25
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:1423
AVDictionaryEntry * av_dict_get(const AVDictionary *m, const char *key, const AVDictionaryEntry *prev, int flags)
Get a dictionary entry with matching key.
Definition: dict.c:40
void avio_write(AVIOContext *s, const unsigned char *buf, int size)
Definition: aviobuf.c:225
static void write_tags(AVIOContext *s, AVDictionary *m)
Definition: ffmetaenc.c:41
static int write_trailer(AVFormatContext *s)
Definition: ffmetaenc.c:60
AVDictionary * metadata
Metadata that applies to the whole file.
Definition: avformat.h:1595
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:153
AVChapter ** chapters
Definition: avformat.h:1585
unsigned int nb_streams
Number of elements in AVFormatContext.streams.
Definition: avformat.h:1411
const char * name
Definition: avformat.h:500
#define ID_STREAM
Definition: ffmeta.h:27
#define s(width, name)
Definition: cbs_vp9.c:257
AVDictionary * metadata
Definition: avformat.h:944
#define AVFMT_NOTIMESTAMPS
Format does not need / have any timestamps.
Definition: avformat.h:462
int64_t end
chapter start/end time in time_base units
Definition: avformat.h:1315
AVIOContext * pb
I/O context.
Definition: avformat.h:1397
void avio_w8(AVIOContext *s, int b)
Definition: aviobuf.c:203
static int write_packet(AVFormatContext *s, AVPacket *pkt)
Definition: ffmetaenc.c:85
static void write_escape_str(AVIOContext *s, const uint8_t *str)
Definition: ffmetaenc.c:29
int64_t start
Definition: avformat.h:1315
Main libavformat public API header.
#define AVFMT_NOSTREAMS
Format does not require any streams.
Definition: avformat.h:467
AVRational time_base
time base in which the start/end timestamps are specified
Definition: avformat.h:1314
char * key
Definition: dict.h:86
int den
Denominator.
Definition: rational.h:60
static int write_header(AVFormatContext *s)
Definition: ffmetaenc.c:52
char * value
Definition: dict.h:87
#define AV_DICT_IGNORE_SUFFIX
Return first entry in a dictionary whose first part corresponds to the search key, ignoring the suffix of the found key string.
Definition: dict.h:70
This structure stores compressed data.
Definition: packet.h:340
int i
Definition: input.c:407
int avio_printf(AVIOContext *s, const char *fmt,...) av_printf_format(2
Writes a formatted string to the context.