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 "mux.h"
27 #include "libavutil/dict.h"
28 
29 
30 static void write_escape_str(AVIOContext *s, const uint8_t *str)
31 {
32  const uint8_t *p = str;
33 
34  while (*p) {
35  if (*p == '#' || *p == ';' || *p == '=' || *p == '\\' || *p == '\n')
36  avio_w8(s, '\\');
37  avio_w8(s, *p);
38  p++;
39  }
40 }
41 
43 {
44  const AVDictionaryEntry *t = NULL;
45  while ((t = av_dict_iterate(m, t))) {
46  write_escape_str(s, t->key);
47  avio_w8(s, '=');
49  avio_w8(s, '\n');
50  }
51 }
52 
54 {
55  avio_write(s->pb, ID_STRING, sizeof(ID_STRING) - 1);
56  avio_w8(s->pb, '1'); // version
57  avio_w8(s->pb, '\n');
58  return 0;
59 }
60 
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  return 0;
84 }
85 
87 {
88  return 0;
89 }
90 
92  .p.name = "ffmetadata",
93  .p.long_name = NULL_IF_CONFIG_SMALL("FFmpeg metadata in text"),
94  .p.extensions = "ffmeta",
95  .write_header = write_header,
96  .write_packet = write_packet,
97  .write_trailer = write_trailer,
99 };
AVOutputFormat::name
const char * name
Definition: avformat.h:511
AVChapter::metadata
AVDictionary * metadata
Definition: avformat.h:1078
AVFMT_NOTIMESTAMPS
#define AVFMT_NOTIMESTAMPS
Format does not need / have any timestamps.
Definition: avformat.h:480
AVChapter::start
int64_t start
Definition: avformat.h:1077
AVDictionary
Definition: dict.c:34
write_header
static int write_header(AVFormatContext *s)
Definition: ffmetaenc.c:53
FFOutputFormat::p
AVOutputFormat p
The public AVOutputFormat.
Definition: mux.h:36
AVChapter
Definition: avformat.h:1074
write_escape_str
static void write_escape_str(AVIOContext *s, const uint8_t *str)
Definition: ffmetaenc.c:30
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
AVChapter::end
int64_t end
chapter start/end time in time_base units
Definition: avformat.h:1077
s
#define s(width, name)
Definition: cbs_vp9.c:198
AVDictionaryEntry::key
char * key
Definition: dict.h:90
AVFormatContext
Format I/O context.
Definition: avformat.h:1115
write_packet
static int write_packet(AVFormatContext *s, AVPacket *pkt)
Definition: ffmetaenc.c:86
NULL
#define NULL
Definition: coverity.c:32
FFOutputFormat
Definition: mux.h:32
avio_w8
void avio_w8(AVIOContext *s, int b)
Definition: aviobuf.c:226
AVIOContext
Bytestream IO Context.
Definition: avio.h:166
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:106
AVFMT_NOSTREAMS
#define AVFMT_NOSTREAMS
Format does not require any streams.
Definition: avformat.h:485
avio_write
void avio_write(AVIOContext *s, const unsigned char *buf, int size)
Definition: aviobuf.c:248
ff_ffmetadata_muxer
const FFOutputFormat ff_ffmetadata_muxer
Definition: ffmetaenc.c:91
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:255
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:42
write_trailer
static int write_trailer(AVFormatContext *s)
Definition: ffmetaenc.c:61
AVDictionaryEntry
Definition: dict.h:89
AVPacket
This structure stores compressed data.
Definition: packet.h:468
AVDictionaryEntry::value
char * value
Definition: dict.h:91
AVChapter::time_base
AVRational time_base
time base in which the start/end timestamps are specified
Definition: avformat.h:1076
av_dict_iterate
const AVDictionaryEntry * av_dict_iterate(const AVDictionary *m, const AVDictionaryEntry *prev)
Iterate over a dictionary.
Definition: dict.c:44
ID_STRING
#define ID_STRING
Definition: ffmeta.h:25
mux.h