1 files changed, 139 insertions, 0 deletions
diff --git a/src/lib/active_captions.cc b/src/lib/active_captions.cc
new file mode 100644
index 000000000..972095e37
--- /dev/null
+++ b/src/lib/active_captions.cc
@@ -0,0 +1,139 @@
+/*
+    Copyright (C) 2017-2018 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 "active_captions.h"
+#include "piece.h"
+#include "text_content.h"
+#include <boost/shared_ptr.hpp>
+#include <boost/weak_ptr.hpp>
+
+using std::list;
+using std::pair;
+using std::make_pair;
+using boost::weak_ptr;
+using boost::shared_ptr;
+using boost::optional;
+
+/** Get the subtitles that should be burnt into a given period.
+ *  @param period Period of interest.
+ *  @param always_burn_subtitles Always burn subtitles even if their content is not set to burn.
+ */
+list<PlayerCaption>
+ActiveCaptions::get_burnt (DCPTimePeriod period, bool always_burn_subtitles) const
+{
+	list<PlayerCaption> ps;
+
+	for (Map::const_iterator i = _data.begin(); i != _data.end(); ++i) {
+
+		shared_ptr<Piece> piece = i->first.lock ();
+		if (!piece) {
+			continue;
+		}
+
+		if (!piece->content->subtitle->use() || (!always_burn_subtitles && !piece->content->subtitle->burn())) {
+			/* Not burning this piece */
+			continue;
+		}
+
+		BOOST_FOREACH (Period j, i->second) {
+			DCPTimePeriod test (j.from, j.to.get_value_or(DCPTime::max()));
+			optional<DCPTimePeriod> overlap = period.overlap (test);
+			if (overlap && overlap->duration() > DCPTime(period.duration().get() / 2)) {
+				ps.push_back (j.subs);
+			}
+		}
+	}
+
+	return ps;
+}
+
+/** Remove subtitles that finish before a given time from our list.
+ *  @param time Time to remove before.
+ */
+void
+ActiveCaptions::clear_before (DCPTime time)
+{
+	Map updated;
+	for (Map::const_iterator i = _data.begin(); i != _data.end(); ++i) {
+		list<Period> as;
+		BOOST_FOREACH (Period j, i->second) {
+			if (!j.to || j.to.get() >= time) {
+				as.push_back (j);
+			}
+		}
+		if (!as.empty ()) {
+			updated[i->first] = as;
+		}
+	}
+	_data = updated;
+}
+
+/** Add a new subtitle with a from time.
+ *  @param piece Piece that the subtitle is from.
+ *  @param ps Subtitles.
+ *  @param from From time for these subtitles.
+ */
+void
+ActiveCaptions::add_from (weak_ptr<Piece> piece, PlayerCaption ps, DCPTime from)
+{
+	if (_data.find(piece) == _data.end()) {
+		_data[piece] = list<Period>();
+	}
+	_data[piece].push_back (Period (ps, from));
+}
+
+/** Add the to time for the last subtitle added from a piece.
+ *  @param piece Piece that the subtitle is from.
+ *  @param to To time for the last subtitle submitted to add_from for this piece.
+ *  @return Return the corresponding subtitles and their from time.
+ */
+pair<PlayerCaption, DCPTime>
+ActiveCaptions::add_to (weak_ptr<Piece> piece, DCPTime to)
+{
+	DCPOMATIC_ASSERT (_data.find(piece) != _data.end());
+
+	_data[piece].back().to = to;
+
+	BOOST_FOREACH (TextCaption& i, _data[piece].back().subs.text) {
+		i.set_out (dcp::Time(to.seconds(), 1000));
+	}
+
+	return make_pair (_data[piece].back().subs, _data[piece].back().from);
+}
+
+/** @param piece A piece.
+ *  @return true if we have any active subtitles from this piece.
+ */
+bool
+ActiveCaptions::have (weak_ptr<Piece> piece) const
+{
+	Map::const_iterator i = _data.find(piece);
+	if (i == _data.end()) {
+		return false;
+	}
+
+	return !i->second.empty();
+}
+
+void
+ActiveCaptions::clear ()
+{
+	_data.clear ();
+}