path: root/libavformat/options.c (plain)
blob: 25a506eef86a6fe1223ccf41f204f207e859a47b

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 "internal.h"
23
24	#include "libavutil/internal.h"
25	#include "libavutil/opt.h"
26
27	/**
28	* @file
29	* Options definition for AVFormatContext.
30	*/
31
32	FF_DISABLE_DEPRECATION_WARNINGS
33	#include "options_table.h"
34	FF_ENABLE_DEPRECATION_WARNINGS
35
36	static const char* format_to_name(void* ptr)
37	{
38	AVFormatContext* fc = (AVFormatContext*) ptr;
39	if(fc->iformat) return fc->iformat->name;
40	else if(fc->oformat) return fc->oformat->name;
41	else return "NULL";
42	}
43
44	static void *format_child_next(void *obj, void *prev)
45	{
46	AVFormatContext *s = obj;
47	if (!prev && s->priv_data &&
48	((s->iformat && s->iformat->priv_class) ||
49	s->oformat && s->oformat->priv_class))
50	return s->priv_data;
51	if (s->pb && s->pb->av_class && prev != s->pb)
52	return s->pb;
53	return NULL;
54	}
55
56	static const AVClass *format_child_class_next(const AVClass *prev)
57	{
58	AVInputFormat *ifmt = NULL;
59	AVOutputFormat *ofmt = NULL;
60
61	if (!prev)
62	return &ff_avio_class;
63
64	while ((ifmt = av_iformat_next(ifmt)))
65	if (ifmt->priv_class == prev)
66	break;
67
68	if (!ifmt)
69	while ((ofmt = av_oformat_next(ofmt)))
70	if (ofmt->priv_class == prev)
71	break;
72	if (!ofmt)
73	while (ifmt = av_iformat_next(ifmt))
74	if (ifmt->priv_class)
75	return ifmt->priv_class;
76
77	while (ofmt = av_oformat_next(ofmt))
78	if (ofmt->priv_class)
79	return ofmt->priv_class;
80
81	return NULL;
82	}
83
84	static AVClassCategory get_category(void *ptr)
85	{
86	AVFormatContext* s = ptr;
87	if(s->iformat) return AV_CLASS_CATEGORY_DEMUXER;
88	else return AV_CLASS_CATEGORY_MUXER;
89	}
90
91	static const AVClass av_format_context_class = {
92	.class_name = "AVFormatContext",
93	.item_name = format_to_name,
94	.option = avformat_options,
95	.version = LIBAVUTIL_VERSION_INT,
96	.child_next = format_child_next,
97	.child_class_next = format_child_class_next,
98	.category = AV_CLASS_CATEGORY_MUXER,
99	.get_category = get_category,
100	};
101
102	static int io_open_default(AVFormatContext *s, AVIOContext **pb,
103	const char *url, int flags, AVDictionary **options)
104	{
105	#if FF_API_OLD_OPEN_CALLBACKS
106	FF_DISABLE_DEPRECATION_WARNINGS
107	if (s->open_cb)
108	return s->open_cb(s, pb, url, flags, &s->interrupt_callback, options);
109	FF_ENABLE_DEPRECATION_WARNINGS
110	#endif
111
112	return ffio_open_whitelist(pb, url, flags, &s->interrupt_callback, options, s->protocol_whitelist, s->protocol_blacklist);
113	}
114
115	static void io_close_default(AVFormatContext *s, AVIOContext *pb)
116	{
117	avio_close(pb);
118	}
119
120	static void avformat_get_context_defaults(AVFormatContext *s)
121	{
122	memset(s, 0, sizeof(AVFormatContext));
123
124	s->av_class = &av_format_context_class;
125
126	s->io_open = io_open_default;
127	s->io_close = io_close_default;
128
129	av_opt_set_defaults(s);
130	}
131
132	AVFormatContext *avformat_alloc_context(void)
133	{
134	AVFormatContext *ic;
135	ic = av_malloc(sizeof(AVFormatContext));
136	if (!ic) return ic;
137	avformat_get_context_defaults(ic);
138
139	ic->internal = av_mallocz(sizeof(*ic->internal));
140	if (!ic->internal) {
141	avformat_free_context(ic);
142	return NULL;
143	}
144	ic->internal->offset = AV_NOPTS_VALUE;
145	ic->internal->raw_packet_buffer_remaining_size = RAW_PACKET_BUFFER_SIZE;
146	ic->internal->shortest_end = AV_NOPTS_VALUE;
147
148	return ic;
149	}
150
151	enum AVDurationEstimationMethod av_fmt_ctx_get_duration_estimation_method(const AVFormatContext* ctx)
152	{
153	return ctx->duration_estimation_method;
154	}
155
156	const AVClass *avformat_get_class(void)
157	{
158	return &av_format_context_class;
159	}
160