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/*
* Copyright (c) 2000, 2001, 2002 Fabrice Bellard
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "avformat.h"
#include "avio_internal.h"
#include "libavutil/opt.h"

/**
* @file
* Options definition for AVFormatContext.
*/

#include "options_table.h"

static const char* format_to_name(void* ptr)
{
    AVFormatContext* fc = (AVFormatContext*) ptr;
    if(fc->iformat) return fc->iformat->name;
    else if(fc->oformat) return fc->oformat->name;
    else return "NULL";
}

static void *format_child_next(void *obj, void *prev)
{
    AVFormatContext *s = obj;
    if (!prev && s->priv_data &&
        ((s->iformat && s->iformat->priv_class) ||
          s->oformat && s->oformat->priv_class))
        return s->priv_data;
    if (s->pb && s->pb->av_class && prev != s->pb)
        return s->pb;
    return NULL;
}

static const AVClass *format_child_class_next(const AVClass *prev)
{
    AVInputFormat *ifmt = NULL;
    AVOutputFormat *ofmt = NULL;

    if (!prev)
        return &ffio_url_class;

    while ((ifmt = av_iformat_next(ifmt)))
        if (ifmt->priv_class == prev)
            break;

    if (!ifmt)
        while ((ofmt = av_oformat_next(ofmt)))
            if (ofmt->priv_class == prev)
                break;
    if (!ofmt)
        while (ifmt = av_iformat_next(ifmt))
            if (ifmt->priv_class)
                return ifmt->priv_class;

    while (ofmt = av_oformat_next(ofmt))
        if (ofmt->priv_class)
            return ofmt->priv_class;

    return NULL;
}

static AVClassCategory get_category(void *ptr)
{
    AVFormatContext* s = ptr;
    if(s->iformat) return AV_CLASS_CATEGORY_DEMUXER;
    else return AV_CLASS_CATEGORY_MUXER;
}

static const AVClass av_format_context_class = {
    .class_name = "AVFormatContext",
    .item_name = format_to_name,
    .option = avformat_options,
    .version = LIBAVUTIL_VERSION_INT,
    .child_next = format_child_next,
    .child_class_next = format_child_class_next,
    .category = AV_CLASS_CATEGORY_MUXER,
    .get_category = get_category,
};

static void avformat_get_context_defaults(AVFormatContext *s)
{
    memset(s, 0, sizeof(AVFormatContext));

    s->av_class = &av_format_context_class;

    av_opt_set_defaults(s);
}

AVFormatContext *avformat_alloc_context(void)
{
    AVFormatContext *ic;
    ic = av_malloc(sizeof(AVFormatContext));
    if (!ic) return ic;
    avformat_get_context_defaults(ic);
    return ic;
}

enum AVDurationEstimationMethod av_fmt_ctx_get_duration_estimation_method(const AVFormatContext* ctx)
{
    return ctx->duration_estimation_method;
}

const AVClass *avformat_get_class(void)
{
    return &av_format_context_class;
}
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