FFmpeg
ffmetaenc.c
Go to the documentation of this file.
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, '=');
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 };
AVOutputFormat::name
const char * name
Definition: avformat.h:496
AVChapter::metadata
AVDictionary * metadata
Definition: avformat.h:1072
AVFMT_NOTIMESTAMPS
#define AVFMT_NOTIMESTAMPS
Format does not need / have any timestamps.
Definition: avformat.h:467
AVChapter::start
int64_t start
Definition: avformat.h:1071
AV_DICT_IGNORE_SUFFIX
#define AV_DICT_IGNORE_SUFFIX
Return first entry in a dictionary whose first part corresponds to the search key,...
Definition: dict.h:68
AVDictionary
Definition: dict.c:30
write_header
static int write_header(AVFormatContext *s)
Definition: ffmetaenc.c:52
ff_ffmetadata_muxer
const AVOutputFormat ff_ffmetadata_muxer
Definition: ffmetaenc.c:90
AVChapter
Definition: avformat.h:1068
write_escape_str
static void write_escape_str(AVIOContext *s, const uint8_t *str)
Definition: ffmetaenc.c:29
ID_CHAPTER
#define ID_CHAPTER
Definition: ffmeta.h:26
AVRational::num
int num
Numerator.
Definition: rational.h:59
pkt
AVPacket * pkt
Definition: movenc.c:59
av_dict_get
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
AVChapter::end
int64_t end
chapter start/end time in time_base units
Definition: avformat.h:1071
s
#define s(width, name)
Definition: cbs_vp9.c:257
AVDictionaryEntry::key
char * key
Definition: dict.h:80
AVFormatContext
Format I/O context.
Definition: avformat.h:1109
write_packet
static int write_packet(AVFormatContext *s, AVPacket *pkt)
Definition: ffmetaenc.c:85
NULL
#define NULL
Definition: coverity.c:32
avio_w8
void avio_w8(AVIOContext *s, int b)
Definition: aviobuf.c:196
AVIOContext
Bytestream IO Context.
Definition: avio.h:161
NULL_IF_CONFIG_SMALL
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
Definition: internal.h:117
AVFMT_NOSTREAMS
#define AVFMT_NOSTREAMS
Format does not require any streams.
Definition: avformat.h:472
avio_write
void avio_write(AVIOContext *s, const unsigned char *buf, int size)
Definition: aviobuf.c:218
AVOutputFormat
Definition: avformat.h:495
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:271
avformat.h
dict.h
avio_printf
int avio_printf(AVIOContext *s, const char *fmt,...) av_printf_format(2
Writes a formatted string to the context.
ID_STREAM
#define ID_STREAM
Definition: ffmeta.h:27
AVRational::den
int den
Denominator.
Definition: rational.h:60
ffmeta.h
write_tags
static void write_tags(AVIOContext *s, AVDictionary *m)
Definition: ffmetaenc.c:41
write_trailer
static int write_trailer(AVFormatContext *s)
Definition: ffmetaenc.c:60
AVDictionaryEntry
Definition: dict.h:79
AVPacket
This structure stores compressed data.
Definition: packet.h:350
convert_header.str
string str
Definition: convert_header.py:20
AVDictionaryEntry::value
char * value
Definition: dict.h:81
AVChapter::time_base
AVRational time_base
time base in which the start/end timestamps are specified
Definition: avformat.h:1070
ID_STRING
#define ID_STRING
Definition: ffmeta.h:25