yading@11: /*
yading@11:  * Copyright (c) 2000, 2001, 2002 Fabrice Bellard
yading@11:  *
yading@11:  * This file is part of FFmpeg.
yading@11:  *
yading@11:  * FFmpeg is free software; you can redistribute it and/or
yading@11:  * modify it under the terms of the GNU Lesser General Public
yading@11:  * License as published by the Free Software Foundation; either
yading@11:  * version 2.1 of the License, or (at your option) any later version.
yading@11:  *
yading@11:  * FFmpeg is distributed in the hope that it will be useful,
yading@11:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@11:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@11:  * Lesser General Public License for more details.
yading@11:  *
yading@11:  * You should have received a copy of the GNU Lesser General Public
yading@11:  * License along with FFmpeg; if not, write to the Free Software
yading@11:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@11:  */
yading@11: #include "avformat.h"
yading@11: #include "avio_internal.h"
yading@11: #include "libavutil/opt.h"
yading@11: 
yading@11: /**
yading@11:  * @file
yading@11:  * Options definition for AVFormatContext.
yading@11:  */
yading@11: 
yading@11: #include "options_table.h"
yading@11: 
yading@11: static const char* format_to_name(void* ptr)
yading@11: {
yading@11:     AVFormatContext* fc = (AVFormatContext*) ptr;
yading@11:     if(fc->iformat) return fc->iformat->name;
yading@11:     else if(fc->oformat) return fc->oformat->name;
yading@11:     else return "NULL";
yading@11: }
yading@11: 
yading@11: static void *format_child_next(void *obj, void *prev)
yading@11: {
yading@11:     AVFormatContext *s = obj;
yading@11:     if (!prev && s->priv_data &&
yading@11:         ((s->iformat && s->iformat->priv_class) ||
yading@11:           s->oformat && s->oformat->priv_class))
yading@11:         return s->priv_data;
yading@11:     if (s->pb && s->pb->av_class && prev != s->pb)
yading@11:         return s->pb;
yading@11:     return NULL;
yading@11: }
yading@11: 
yading@11: static const AVClass *format_child_class_next(const AVClass *prev)
yading@11: {
yading@11:     AVInputFormat  *ifmt = NULL;
yading@11:     AVOutputFormat *ofmt = NULL;
yading@11: 
yading@11:     if (!prev)
yading@11:         return &ffio_url_class;
yading@11: 
yading@11:     while ((ifmt = av_iformat_next(ifmt)))
yading@11:         if (ifmt->priv_class == prev)
yading@11:             break;
yading@11: 
yading@11:     if (!ifmt)
yading@11:         while ((ofmt = av_oformat_next(ofmt)))
yading@11:             if (ofmt->priv_class == prev)
yading@11:                 break;
yading@11:     if (!ofmt)
yading@11:         while (ifmt = av_iformat_next(ifmt))
yading@11:             if (ifmt->priv_class)
yading@11:                 return ifmt->priv_class;
yading@11: 
yading@11:     while (ofmt = av_oformat_next(ofmt))
yading@11:         if (ofmt->priv_class)
yading@11:             return ofmt->priv_class;
yading@11: 
yading@11:     return NULL;
yading@11: }
yading@11: 
yading@11: static AVClassCategory get_category(void *ptr)
yading@11: {
yading@11:     AVFormatContext* s = ptr;
yading@11:     if(s->iformat) return AV_CLASS_CATEGORY_DEMUXER;
yading@11:     else           return AV_CLASS_CATEGORY_MUXER;
yading@11: }
yading@11: 
yading@11: static const AVClass av_format_context_class = {
yading@11:     .class_name     = "AVFormatContext",
yading@11:     .item_name      = format_to_name,
yading@11:     .option         = options,
yading@11:     .version        = LIBAVUTIL_VERSION_INT,
yading@11:     .child_next     = format_child_next,
yading@11:     .child_class_next = format_child_class_next,
yading@11:     .category       = AV_CLASS_CATEGORY_MUXER,
yading@11:     .get_category   = get_category,
yading@11: };
yading@11: 
yading@11: static void avformat_get_context_defaults(AVFormatContext *s)
yading@11: {
yading@11:     memset(s, 0, sizeof(AVFormatContext));
yading@11: 
yading@11:     s->av_class = &av_format_context_class;
yading@11: 
yading@11:     av_opt_set_defaults(s);
yading@11: }
yading@11: 
yading@11: AVFormatContext *avformat_alloc_context(void)
yading@11: {
yading@11:     AVFormatContext *ic;
yading@11:     ic = av_malloc(sizeof(AVFormatContext));
yading@11:     if (!ic) return ic;
yading@11:     avformat_get_context_defaults(ic);
yading@11:     return ic;
yading@11: }
yading@11: 
yading@11: enum AVDurationEstimationMethod av_fmt_ctx_get_duration_estimation_method(const AVFormatContext* ctx)
yading@11: {
yading@11:     return ctx->duration_estimation_method;
yading@11: }
yading@11: 
yading@11: const AVClass *avformat_get_class(void)
yading@11: {
yading@11:     return &av_format_context_class;
yading@11: }