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options.c
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1 /*
2  * Copyright (c) 2000, 2001, 2002 Fabrice Bellard
3  *
4  * This file is part of FFmpeg.
5  *
6  * FFmpeg is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Lesser General Public
8  * License as published by the Free Software Foundation; either
9  * version 2.1 of the License, or (at your option) any later version.
10  *
11  * FFmpeg is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14  * Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public
17  * License along with FFmpeg; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20 #include "avformat.h"
21 #include "avio_internal.h"
22 #include "libavutil/opt.h"
23 
24 /**
25  * @file
26  * Options definition for AVFormatContext.
27  */
28 
29 #include "options_table.h"
30 
31 static const char* format_to_name(void* ptr)
32 {
34  if(fc->iformat) return fc->iformat->name;
35  else if(fc->oformat) return fc->oformat->name;
36  else return "NULL";
37 }
38 
39 static void *format_child_next(void *obj, void *prev)
40 {
41  AVFormatContext *s = obj;
42  if (!prev && s->priv_data &&
43  ((s->iformat && s->iformat->priv_class) ||
44  s->oformat && s->oformat->priv_class))
45  return s->priv_data;
46  if (s->pb && s->pb->av_class && prev != s->pb)
47  return s->pb;
48  return NULL;
49 }
50 
51 static const AVClass *format_child_class_next(const AVClass *prev)
52 {
53  AVInputFormat *ifmt = NULL;
54  AVOutputFormat *ofmt = NULL;
55 
56  if (!prev)
57  return &ffio_url_class;
58 
59  while ((ifmt = av_iformat_next(ifmt)))
60  if (ifmt->priv_class == prev)
61  break;
62 
63  if (!ifmt)
64  while ((ofmt = av_oformat_next(ofmt)))
65  if (ofmt->priv_class == prev)
66  break;
67  if (!ofmt)
68  while (ifmt = av_iformat_next(ifmt))
69  if (ifmt->priv_class)
70  return ifmt->priv_class;
71 
72  while (ofmt = av_oformat_next(ofmt))
73  if (ofmt->priv_class)
74  return ofmt->priv_class;
75 
76  return NULL;
77 }
78 
79 static AVClassCategory get_category(void *ptr)
80 {
81  AVFormatContext* s = ptr;
82  if(s->iformat) return AV_CLASS_CATEGORY_DEMUXER;
83  else return AV_CLASS_CATEGORY_MUXER;
84 }
85 
87  .class_name = "AVFormatContext",
88  .item_name = format_to_name,
89  .option = avformat_options,
90  .version = LIBAVUTIL_VERSION_INT,
91  .child_next = format_child_next,
92  .child_class_next = format_child_class_next,
94  .get_category = get_category,
95 };
96 
98 {
99  memset(s, 0, sizeof(AVFormatContext));
100 
102 
104 }
105 
107 {
108  AVFormatContext *ic;
109  ic = av_malloc(sizeof(AVFormatContext));
110  if (!ic) return ic;
112  return ic;
113 }
114 
116 {
117  return ctx->duration_estimation_method;
118 }
119 
121 {
122  return &av_format_context_class;
123 }