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#include "libavutil/opt.h"
24
25/**
26 * @file
27 * Options definition for AVFormatContext.
28 */
29
30#include "options_table.h"
31
32static const char* format_to_name(void* ptr)
33{
34    AVFormatContext* fc = (AVFormatContext*) ptr;
35    if(fc->iformat) return fc->iformat->name;
36    else if(fc->oformat) return fc->oformat->name;
37    else return "NULL";
38}
39
40static void *format_child_next(void *obj, void *prev)
41{
42    AVFormatContext *s = obj;
43    if (!prev && s->priv_data &&
44        ((s->iformat && s->iformat->priv_class) ||
45          s->oformat && s->oformat->priv_class))
46        return s->priv_data;
47    if (s->pb && s->pb->av_class && prev != s->pb)
48        return s->pb;
49    return NULL;
50}
51
52static const AVClass *format_child_class_next(const AVClass *prev)
53{
54    AVInputFormat  *ifmt = NULL;
55    AVOutputFormat *ofmt = NULL;
56
57    if (!prev)
58        return &ffio_url_class;
59
60    while ((ifmt = av_iformat_next(ifmt)))
61        if (ifmt->priv_class == prev)
62            break;
63
64    if (!ifmt)
65        while ((ofmt = av_oformat_next(ofmt)))
66            if (ofmt->priv_class == prev)
67                break;
68    if (!ofmt)
69        while (ifmt = av_iformat_next(ifmt))
70            if (ifmt->priv_class)
71                return ifmt->priv_class;
72
73    while (ofmt = av_oformat_next(ofmt))
74        if (ofmt->priv_class)
75            return ofmt->priv_class;
76
77    return NULL;
78}
79
80static AVClassCategory get_category(void *ptr)
81{
82    AVFormatContext* s = ptr;
83    if(s->iformat) return AV_CLASS_CATEGORY_DEMUXER;
84    else           return AV_CLASS_CATEGORY_MUXER;
85}
86
87static const AVClass av_format_context_class = {
88    .class_name     = "AVFormatContext",
89    .item_name      = format_to_name,
90    .option         = avformat_options,
91    .version        = LIBAVUTIL_VERSION_INT,
92    .child_next     = format_child_next,
93    .child_class_next = format_child_class_next,
94    .category       = AV_CLASS_CATEGORY_MUXER,
95    .get_category   = get_category,
96};
97
98static void avformat_get_context_defaults(AVFormatContext *s)
99{
100    memset(s, 0, sizeof(AVFormatContext));
101
102    s->av_class = &av_format_context_class;
103
104    av_opt_set_defaults(s);
105}
106
107AVFormatContext *avformat_alloc_context(void)
108{
109    AVFormatContext *ic;
110    ic = av_malloc(sizeof(AVFormatContext));
111    if (!ic) return ic;
112    avformat_get_context_defaults(ic);
113
114    ic->internal = av_mallocz(sizeof(*ic->internal));
115    if (!ic->internal) {
116        avformat_free_context(ic);
117        return NULL;
118    }
119
120    return ic;
121}
122
123enum AVDurationEstimationMethod av_fmt_ctx_get_duration_estimation_method(const AVFormatContext* ctx)
124{
125    return ctx->duration_estimation_method;
126}
127
128const AVClass *avformat_get_class(void)
129{
130    return &av_format_context_class;
131}
132