1 files changed, 74 insertions, 0 deletions
diff --git a/src/lib/level_calculator.h b/src/lib/level_calculator.h
new file mode 100644
index 000000000..9eeb5b9b8
--- /dev/null
+++ b/src/lib/level_calculator.h
@@ -0,0 +1,74 @@
+/*
+    Copyright (C) 2025 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/>.
+
+*/
+
+
+#ifndef DCPOMATIC_LEVEL_CALCULATOR_H
+#define DCPOMATIC_LEVEL_CALCULATOR_H
+
+
+#include "dcpomatic_time.h"
+#include <boost/thread.hpp>
+#include <memory>
+
+
+class AudioBuffers;
+
+
+class LevelCalculator
+{
+public:
+	LevelCalculator();
+
+	LevelCalculator(LevelCalculator const&) = delete;
+	LevelCalculator& operator=(LevelCalculator const&) = delete;
+
+	void put(std::shared_ptr<const AudioBuffers> audio, dcpomatic::DCPTime time, int frame_rate);
+	void clear();
+	std::vector<float> get(dcpomatic::DCPTime time);
+
+	void enable(bool e);
+
+private:
+	boost::mutex _current_mutex;
+	std::vector<float> _current_peaks;
+	int _current_frames = 0;
+
+	struct Measurement
+	{
+		Measurement(dcpomatic::DCPTime t, std::vector<float> v)
+			: time(t)
+			, value(std::move(v))
+		{
+
+		}
+
+		dcpomatic::DCPTime time;
+		std::vector<float> value;
+	};
+
+	mutable boost::mutex _store_mutex;
+	std::list<Measurement> _peaks;
+
+	boost::atomic<bool> _enabled;
+};
+
+
+#endif
+