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doc
examples
show_metadata.c
Go to the documentation of this file.
1
/*
2
* Copyright (c) 2011 Reinhard Tartler
3
*
4
* Permission is hereby granted, free of charge, to any person obtaining a copy
5
* of this software and associated documentation files (the "Software"), to deal
6
* in the Software without restriction, including without limitation the rights
7
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
8
* copies of the Software, and to permit persons to whom the Software is
9
* furnished to do so, subject to the following conditions:
10
*
11
* The above copyright notice and this permission notice shall be included in
12
* all copies or substantial portions of the Software.
13
*
14
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
17
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
18
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
19
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
20
* THE SOFTWARE.
21
*/
22
23
/**
24
* @file libavformat metadata extraction API usage example
25
* @example show_metadata.c
26
*
27
* Show metadata from an input file.
28
*/
29
30
#include <stdio.h>
31
32
#include <
libavformat/avformat.h
>
33
#include <
libavutil/dict.h
>
34
35
int
main
(
int
argc,
char
**argv)
36
{
37
AVFormatContext
*
fmt_ctx
=
NULL
;
38
const
AVDictionaryEntry
*
tag
=
NULL
;
39
int
ret
;
40
41
if
(argc != 2) {
42
printf
(
"usage: %s <input_file>\n"
43
"example program to demonstrate the use of the libavformat metadata API.\n"
44
"\n"
, argv[0]);
45
return
1;
46
}
47
48
if
((
ret
=
avformat_open_input
(&
fmt_ctx
, argv[1],
NULL
,
NULL
)))
49
return
ret
;
50
51
if
((
ret
=
avformat_find_stream_info
(
fmt_ctx
,
NULL
)) < 0) {
52
av_log
(
NULL
,
AV_LOG_ERROR
,
"Cannot find stream information\n"
);
53
return
ret
;
54
}
55
56
while
((
tag
=
av_dict_iterate
(
fmt_ctx
->
metadata
,
tag
)))
57
printf
(
"%s=%s\n"
,
tag
->key,
tag
->value);
58
59
avformat_close_input
(&
fmt_ctx
);
60
return
0;
61
}
avformat_close_input
void avformat_close_input(AVFormatContext **s)
Close an opened input AVFormatContext.
Definition:
demux.c:367
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition:
log.h:209
AVFormatContext::metadata
AVDictionary * metadata
Metadata that applies to the whole file.
Definition:
avformat.h:1535
avformat_open_input
int avformat_open_input(AVFormatContext **ps, const char *url, const AVInputFormat *fmt, AVDictionary **options)
Open an input stream and read the header.
Definition:
demux.c:217
AVFormatContext
Format I/O context.
Definition:
avformat.h:1300
NULL
#define NULL
Definition:
coverity.c:32
avformat_find_stream_info
int avformat_find_stream_info(AVFormatContext *ic, AVDictionary **options)
Read packets of a media file to get stream information.
Definition:
demux.c:2534
fmt_ctx
static AVFormatContext * fmt_ctx
Definition:
decode_filter_audio.c:46
printf
printf("static const uint8_t my_array[100] = {\n")
main
int main(int argc, char **argv)
Definition:
show_metadata.c:35
tag
uint32_t tag
Definition:
movenc.c:1911
ret
ret
Definition:
filter_design.txt:187
avformat.h
dict.h
AVDictionaryEntry
Definition:
dict.h:89
av_log
#define av_log(a,...)
Definition:
tableprint_vlc.h:27
av_dict_iterate
const AVDictionaryEntry * av_dict_iterate(const AVDictionary *m, const AVDictionaryEntry *prev)
Iterate over a dictionary.
Definition:
dict.c:44
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