2 * Copyright (c) 2000, 2001, 2002 Fabrice Bellard
4 * This file is part of FFmpeg.
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.
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.
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
21 #include "avio_internal.h"
23 #include "libavutil/opt.h"
27 * Options definition for AVFormatContext.
30 #include "options_table.h"
32 static const char* format_to_name(void* ptr)
34 AVFormatContext* fc = (AVFormatContext*) ptr;
35 if(fc->iformat) return fc->iformat->name;
36 else if(fc->oformat) return fc->oformat->name;
40 static void *format_child_next(void *obj, void *prev)
42 AVFormatContext *s = obj;
43 if (!prev && s->priv_data &&
44 ((s->iformat && s->iformat->priv_class) ||
45 s->oformat && s->oformat->priv_class))
47 if (s->pb && s->pb->av_class && prev != s->pb)
52 static const AVClass *format_child_class_next(const AVClass *prev)
54 AVInputFormat *ifmt = NULL;
55 AVOutputFormat *ofmt = NULL;
58 return &ff_avio_class;
60 while ((ifmt = av_iformat_next(ifmt)))
61 if (ifmt->priv_class == prev)
65 while ((ofmt = av_oformat_next(ofmt)))
66 if (ofmt->priv_class == prev)
69 while (ifmt = av_iformat_next(ifmt))
71 return ifmt->priv_class;
73 while (ofmt = av_oformat_next(ofmt))
75 return ofmt->priv_class;
80 static AVClassCategory get_category(void *ptr)
82 AVFormatContext* s = ptr;
83 if(s->iformat) return AV_CLASS_CATEGORY_DEMUXER;
84 else return AV_CLASS_CATEGORY_MUXER;
87 static 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,
98 static void avformat_get_context_defaults(AVFormatContext *s)
100 memset(s, 0, sizeof(AVFormatContext));
102 s->av_class = &av_format_context_class;
104 av_opt_set_defaults(s);
107 AVFormatContext *avformat_alloc_context(void)
110 ic = av_malloc(sizeof(AVFormatContext));
112 avformat_get_context_defaults(ic);
114 ic->internal = av_mallocz(sizeof(*ic->internal));
116 avformat_free_context(ic);
119 ic->internal->offset = AV_NOPTS_VALUE;
120 ic->internal->raw_packet_buffer_remaining_size = RAW_PACKET_BUFFER_SIZE;
125 enum AVDurationEstimationMethod av_fmt_ctx_get_duration_estimation_method(const AVFormatContext* ctx)
127 return ctx->duration_estimation_method;
130 const AVClass *avformat_get_class(void)
132 return &av_format_context_class;