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metadata.c
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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
25  * Shows how the metadata API can be used in application programs.
26  * @example metadata.c
27  */
28 
29 #include <stdio.h>
30 
31 #include <libavformat/avformat.h>
32 #include <libavutil/dict.h>
33 
34 int main (int argc, char **argv)
35 {
38  int ret;
39 
40  if (argc != 2) {
41  printf("usage: %s <input_file>\n"
42  "example program to demonstrate the use of the libavformat metadata API.\n"
43  "\n", argv[0]);
44  return 1;
45  }
46 
48  if ((ret = avformat_open_input(&fmt_ctx, argv[1], NULL, NULL)))
49  return ret;
50 
51  while ((tag = av_dict_get(fmt_ctx->metadata, "", tag, AV_DICT_IGNORE_SUFFIX)))
52  printf("%s=%s\n", tag->key, tag->value);
53 
54  avformat_close_input(&fmt_ctx);
55  return 0;
56 }
#define NULL
Definition: coverity.c:32
int main(int argc, char **argv)
Definition: metadata.c:34
static AVFormatContext * fmt_ctx
Format I/O context.
Definition: avformat.h:1325
Public dictionary API.
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:39
uint32_t tag
Definition: movenc.c:1376
AVDictionary * metadata
Metadata that applies to the whole file.
Definition: avformat.h:1539
Main libavformat public API header.
char * key
Definition: dict.h:86
void avformat_close_input(AVFormatContext **s)
Close an opened input AVFormatContext.
Definition: utils.c:4103
char * value
Definition: dict.h:87
int avformat_open_input(AVFormatContext **ps, const char *url, AVInputFormat *fmt, AVDictionary **options)
Open an input stream and read the header.
Definition: utils.c:471
#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
void av_register_all(void)
Initialize libavformat and register all the muxers, demuxers and protocols.
Definition: allformats.c:44