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/*
Copyright (C) 2016-2017 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 "butler.h"
#include "player.h"
#include <boost/weak_ptr.hpp>
#include <boost/shared_ptr.hpp>
using std::cout;
using std::pair;
using std::make_pair;
using boost::weak_ptr;
using boost::shared_ptr;
using boost::bind;
using boost::optional;
/** Video readahead in frames */
#define VIDEO_READAHEAD 10
Butler::Butler (weak_ptr<const Film> film, shared_ptr<Player> player)
: _film (film)
, _player (player)
, _pending_seek_accurate (false)
, _finished (false)
{
_player->Video.connect (bind (&VideoRingBuffers::put, &_video, _1, _2));
_thread = new boost::thread (bind (&Butler::thread, this));
}
Butler::~Butler ()
{
_thread->interrupt ();
try {
_thread->join ();
} catch (boost::thread_interrupted& e) {
/* No problem */
}
delete _thread;
}
void
Butler::thread ()
{
while (true) {
boost::mutex::scoped_lock lm (_mutex);
while (_video.size() > VIDEO_READAHEAD && !_pending_seek_position) {
_summon.wait (lm);
}
if (_pending_seek_position) {
_player->seek (*_pending_seek_position, _pending_seek_accurate);
_pending_seek_position = optional<DCPTime> ();
}
while (_video.size() < VIDEO_READAHEAD) {
_arrived.notify_all ();
if (_player->pass ()) {
_finished = true;
break;
}
}
}
}
pair<shared_ptr<PlayerVideo>, DCPTime>
Butler::get_video ()
{
boost::mutex::scoped_lock lm (_mutex);
while (_video.size() == 0 && !_finished) {
_arrived.wait (lm);
}
if (_finished) {
return make_pair (shared_ptr<PlayerVideo>(), DCPTime());
}
return _video.get ();
}
void
Butler::seek (DCPTime position, bool accurate)
{
_video.clear ();
{
boost::mutex::scoped_lock lm (_mutex);
_finished = false;
_pending_seek_position = position;
_pending_seek_accurate = accurate;
}
_summon.notify_all ();
}
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