options.c 4.76 KB
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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"
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#include "avio_internal.h"
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#include "internal.h"
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#include "libavutil/internal.h"
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#include "libavutil/opt.h"
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/**
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 * @file
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 * Options definition for AVFormatContext.
 */

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FF_DISABLE_DEPRECATION_WARNINGS
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#include "options_table.h"
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FF_ENABLE_DEPRECATION_WARNINGS
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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";
}

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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;
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    if (s->pb && s->pb->av_class && prev != s->pb)
        return s->pb;
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    return NULL;
}

static const AVClass *format_child_class_next(const AVClass *prev)
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{
    AVInputFormat  *ifmt = NULL;
    AVOutputFormat *ofmt = NULL;
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    if (!prev)
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        return &ff_avio_class;
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    while ((ifmt = av_iformat_next(ifmt)))
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        if (ifmt->priv_class == prev)
            break;
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    if (!ifmt)
        while ((ofmt = av_oformat_next(ofmt)))
            if (ofmt->priv_class == prev)
                break;
    if (!ofmt)
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        while (ifmt = av_iformat_next(ifmt))
            if (ifmt->priv_class)
                return ifmt->priv_class;

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

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

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static const AVClass av_format_context_class = {
    .class_name     = "AVFormatContext",
    .item_name      = format_to_name,
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    .option         = avformat_options,
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    .version        = LIBAVUTIL_VERSION_INT,
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    .child_next     = format_child_next,
    .child_class_next = format_child_class_next,
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    .category       = AV_CLASS_CATEGORY_MUXER,
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    .get_category   = get_category,
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};
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static int io_open_default(AVFormatContext *s, AVIOContext **pb,
                           const char *url, int flags, AVDictionary **options)
{
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    int loglevel;

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    if (!strcmp(url, s->url) ||
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        s->iformat && !strcmp(s->iformat->name, "image2") ||
        s->oformat && !strcmp(s->oformat->name, "image2")
    ) {
        loglevel = AV_LOG_DEBUG;
    } else
        loglevel = AV_LOG_INFO;

    av_log(s, loglevel, "Opening \'%s\' for %s\n", url, flags & AVIO_FLAG_WRITE ? "writing" : "reading");

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#if FF_API_OLD_OPEN_CALLBACKS
FF_DISABLE_DEPRECATION_WARNINGS
    if (s->open_cb)
        return s->open_cb(s, pb, url, flags, &s->interrupt_callback, options);
FF_ENABLE_DEPRECATION_WARNINGS
#endif

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    return ffio_open_whitelist(pb, url, flags, &s->interrupt_callback, options, s->protocol_whitelist, s->protocol_blacklist);
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}

static void io_close_default(AVFormatContext *s, AVIOContext *pb)
{
    avio_close(pb);
}

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

    s->av_class = &av_format_context_class;

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    s->io_open  = io_open_default;
    s->io_close = io_close_default;

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    av_opt_set_defaults(s);
}

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AVFormatContext *avformat_alloc_context(void)
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{
    AVFormatContext *ic;
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    AVFormatInternal *internal;
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    ic = av_malloc(sizeof(AVFormatContext));
    if (!ic) return ic;
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    internal = av_mallocz(sizeof(*internal));
    if (!internal) {
        av_free(ic);
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        return NULL;
    }
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    avformat_get_context_defaults(ic);
    ic->internal = internal;
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    ic->internal->offset = AV_NOPTS_VALUE;
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    ic->internal->raw_packet_buffer_remaining_size = RAW_PACKET_BUFFER_SIZE;
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    ic->internal->shortest_end = AV_NOPTS_VALUE;
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    return ic;
}
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enum AVDurationEstimationMethod av_fmt_ctx_get_duration_estimation_method(const AVFormatContext* ctx)
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{
    return ctx->duration_estimation_method;
}

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