Initial butler work.

1 files changed, 111 insertions, 0 deletions

diff --git a/src/lib/butler.cc b/src/lib/butler.cc
new file mode 100644
index 000000000..e40ae0b24
--- /dev/null
+++ b/src/lib/butler.cc
@@ -0,0 +1,111 @@
+/*
+    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 ();
+}