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"
24 #include "libavutil/avassert.h"
25 #include "libavutil/internal.h"
26 #include "libavutil/opt.h"
30 * Options definition for AVFormatContext.
33 FF_DISABLE_DEPRECATION_WARNINGS
34 #include "options_table.h"
35 FF_ENABLE_DEPRECATION_WARNINGS
37 static const char* format_to_name(void* ptr)
39 AVFormatContext* fc = (AVFormatContext*) ptr;
40 if(fc->iformat) return fc->iformat->name;
41 else if(fc->oformat) return fc->oformat->name;
45 static void *format_child_next(void *obj, void *prev)
47 AVFormatContext *s = obj;
48 if (!prev && s->priv_data &&
49 ((s->iformat && s->iformat->priv_class) ||
50 s->oformat && s->oformat->priv_class))
52 if (s->pb && s->pb->av_class && prev != s->pb)
57 #if FF_API_CHILD_CLASS_NEXT
58 FF_DISABLE_DEPRECATION_WARNINGS
59 static const AVClass *format_child_class_next(const AVClass *prev)
61 AVInputFormat *ifmt = NULL;
62 AVOutputFormat *ofmt = NULL;
65 return &ff_avio_class;
67 while ((ifmt = av_iformat_next(ifmt)))
68 if (ifmt->priv_class == prev)
72 while ((ofmt = av_oformat_next(ofmt)))
73 if (ofmt->priv_class == prev)
76 while (ifmt = av_iformat_next(ifmt))
78 return ifmt->priv_class;
80 while (ofmt = av_oformat_next(ofmt))
82 return ofmt->priv_class;
86 FF_ENABLE_DEPRECATION_WARNINGS
90 CHILD_CLASS_ITER_AVIO = 0,
92 CHILD_CLASS_ITER_DEMUX,
93 CHILD_CLASS_ITER_DONE,
97 #define ITER_STATE_SHIFT 16
99 static const AVClass *format_child_class_iterate(void **iter)
101 // we use the low 16 bits of iter as the value to be passed to
102 // av_(de)muxer_iterate()
103 void *val = (void*)(((uintptr_t)*iter) & ((1 << ITER_STATE_SHIFT) - 1));
104 unsigned int state = ((uintptr_t)*iter) >> ITER_STATE_SHIFT;
105 const AVClass *ret = NULL;
107 if (state == CHILD_CLASS_ITER_AVIO) {
108 ret = &ff_avio_class;
113 if (state == CHILD_CLASS_ITER_MUX) {
114 const AVOutputFormat *ofmt;
116 while ((ofmt = av_muxer_iterate(&val))) {
117 ret = ofmt->priv_class;
126 if (state == CHILD_CLASS_ITER_DEMUX) {
127 const AVInputFormat *ifmt;
129 while ((ifmt = av_demuxer_iterate(&val))) {
130 ret = ifmt->priv_class;
139 // make sure none av_(de)muxer_iterate does not set the high bits of val
140 av_assert0(!((uintptr_t)val >> ITER_STATE_SHIFT));
141 *iter = (void*)((uintptr_t)val | (state << ITER_STATE_SHIFT));
145 static AVClassCategory get_category(void *ptr)
147 AVFormatContext* s = ptr;
148 if(s->iformat) return AV_CLASS_CATEGORY_DEMUXER;
149 else return AV_CLASS_CATEGORY_MUXER;
152 static const AVClass av_format_context_class = {
153 .class_name = "AVFormatContext",
154 .item_name = format_to_name,
155 .option = avformat_options,
156 .version = LIBAVUTIL_VERSION_INT,
157 .child_next = format_child_next,
158 #if FF_API_CHILD_CLASS_NEXT
159 .child_class_next = format_child_class_next,
161 .child_class_iterate = format_child_class_iterate,
162 .category = AV_CLASS_CATEGORY_MUXER,
163 .get_category = get_category,
166 static int io_open_default(AVFormatContext *s, AVIOContext **pb,
167 const char *url, int flags, AVDictionary **options)
171 if (!strcmp(url, s->url) ||
172 s->iformat && !strcmp(s->iformat->name, "image2") ||
173 s->oformat && !strcmp(s->oformat->name, "image2")
175 loglevel = AV_LOG_DEBUG;
177 loglevel = AV_LOG_INFO;
179 av_log(s, loglevel, "Opening \'%s\' for %s\n", url, flags & AVIO_FLAG_WRITE ? "writing" : "reading");
181 #if FF_API_OLD_OPEN_CALLBACKS
182 FF_DISABLE_DEPRECATION_WARNINGS
184 return s->open_cb(s, pb, url, flags, &s->interrupt_callback, options);
185 FF_ENABLE_DEPRECATION_WARNINGS
188 return ffio_open_whitelist(pb, url, flags, &s->interrupt_callback, options, s->protocol_whitelist, s->protocol_blacklist);
191 static void io_close_default(AVFormatContext *s, AVIOContext *pb)
196 static void avformat_get_context_defaults(AVFormatContext *s)
198 memset(s, 0, sizeof(AVFormatContext));
200 s->av_class = &av_format_context_class;
202 s->io_open = io_open_default;
203 s->io_close = io_close_default;
205 av_opt_set_defaults(s);
208 AVFormatContext *avformat_alloc_context(void)
211 AVFormatInternal *internal;
212 ic = av_malloc(sizeof(AVFormatContext));
215 internal = av_mallocz(sizeof(*internal));
220 avformat_get_context_defaults(ic);
221 ic->internal = internal;
222 ic->internal->offset = AV_NOPTS_VALUE;
223 ic->internal->raw_packet_buffer_remaining_size = RAW_PACKET_BUFFER_SIZE;
224 ic->internal->shortest_end = AV_NOPTS_VALUE;
229 enum AVDurationEstimationMethod av_fmt_ctx_get_duration_estimation_method(const AVFormatContext* ctx)
231 return ctx->duration_estimation_method;
234 const AVClass *avformat_get_class(void)
236 return &av_format_context_class;