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/*
Copyright (C) 2012-2021 Carl Hetherington <cth@carlh.net>
This file is part of DCP-o-matic.
DCP-o-matic is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
DCP-o-matic 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with DCP-o-matic. If not, see <http://www.gnu.org/licenses/>.
*/
#include "decoder.h"
#include "video_decoder.h"
#include "audio_decoder.h"
#include "text_decoder.h"
#include <boost/optional.hpp>
#include <iostream>
using std::cout;
using boost::optional;
using std::shared_ptr;
using std::weak_ptr;
using namespace dcpomatic;
Decoder::Decoder (weak_ptr<const Film> film)
: WeakConstFilm (film)
{
}
/** @return Earliest time of content that the next pass() will emit */
ContentTime
Decoder::position () const
{
optional<ContentTime> pos;
auto f = film();
if (video && !video->ignore() && (!pos || video->position(f).get_value_or(ContentTime()) < *pos)) {
pos = video->position(f);
}
if (audio && !audio->ignore() && (!pos || audio->position(f).get_value_or(ContentTime()) < *pos)) {
pos = audio->position(f);
}
/* Only decide position based on subtitle sources if there is nothing else
to go on. Otherwise we can have problems with muxed sources which have
(for example) video, audio and a subtitle. If the subtitle data runs out
before the video/audio the position() call will return the position of the
end of the subs. This causes this file to be pass()ed in favour of others,
which can cause bugs like #1581.
*/
if (!pos) {
for (auto i: text) {
if (!i->ignore() && (!pos || i->position(f) < *pos)) {
pos = i->position(f);
}
}
}
return pos.get_value_or(ContentTime());
}
void
Decoder::seek (ContentTime, bool)
{
if (video) {
video->seek ();
}
if (audio) {
audio->seek ();
}
for (auto i: text) {
i->seek ();
}
}
shared_ptr<TextDecoder>
Decoder::only_text () const
{
DCPOMATIC_ASSERT (text.size() < 2);
if (text.empty()) {
return {};
}
return text.front();
}
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