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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 "internal.h"
#include "libavutil/avassert.h"
#include "libavutil/internal.h"
#include "libavutil/opt.h"
/**
* @file
* Options definition for AVFormatContext.
*/
FF_DISABLE_DEPRECATION_WARNINGS
#include "options_table.h"
FF_ENABLE_DEPRECATION_WARNINGS
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;
}
enum {
CHILD_CLASS_ITER_AVIO = 0,
CHILD_CLASS_ITER_MUX,
CHILD_CLASS_ITER_DEMUX,
CHILD_CLASS_ITER_DONE,
};
#define ITER_STATE_SHIFT 16
static const AVClass *format_child_class_iterate(void **iter)
{
// we use the low 16 bits of iter as the value to be passed to
// av_(de)muxer_iterate()
void *val = (void*)(((uintptr_t)*iter) & ((1 << ITER_STATE_SHIFT) - 1));
unsigned int state = ((uintptr_t)*iter) >> ITER_STATE_SHIFT;
const AVClass *ret = NULL;
if (state == CHILD_CLASS_ITER_AVIO) {
ret = &ff_avio_class;
state++;
goto finish;
}
if (state == CHILD_CLASS_ITER_MUX) {
const AVOutputFormat *ofmt;
while ((ofmt = av_muxer_iterate(&val))) {
ret = ofmt->priv_class;
if (ret)
goto finish;
}
val = NULL;
state++;
}
if (state == CHILD_CLASS_ITER_DEMUX) {
const AVInputFormat *ifmt;
while ((ifmt = av_demuxer_iterate(&val))) {
ret = ifmt->priv_class;
if (ret)
goto finish;
}
val = NULL;
state++;
}
finish:
// make sure none av_(de)muxer_iterate does not set the high bits of val
av_assert0(!((uintptr_t)val >> ITER_STATE_SHIFT));
*iter = (void*)((uintptr_t)val | (state << ITER_STATE_SHIFT));
return ret;
}
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_iterate = format_child_class_iterate,
.category = AV_CLASS_CATEGORY_MUXER,
.get_category = get_category,
};
static int io_open_default(AVFormatContext *s, AVIOContext **pb,
const char *url, int flags, AVDictionary **options)
{
int loglevel;
if (!strcmp(url, s->url) ||
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");
return ffio_open_whitelist(pb, url, flags, &s->interrupt_callback, options, s->protocol_whitelist, s->protocol_blacklist);
}
static void io_close_default(AVFormatContext *s, AVIOContext *pb)
{
avio_close(pb);
}
AVFormatContext *avformat_alloc_context(void)
{
FFFormatContext *const si = av_mallocz(sizeof(*si));
AVFormatContext *s;
if (!si)
return NULL;
s = &si->pub;
s->av_class = &av_format_context_class;
s->io_open = io_open_default;
s->io_close = io_close_default;
av_opt_set_defaults(s);
si->pkt = av_packet_alloc();
si->parse_pkt = av_packet_alloc();
if (!si->pkt || !si->parse_pkt) {
avformat_free_context(s);
return NULL;
}
si->offset = AV_NOPTS_VALUE;
si->raw_packet_buffer_remaining_size = RAW_PACKET_BUFFER_SIZE;
si->shortest_end = AV_NOPTS_VALUE;
return s;
}
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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