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diff --git a/src/lib/piece_audio.h b/src/lib/piece_audio.h
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+++ b/src/lib/piece_audio.h
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+/*
+    Copyright (C) 2014-2021 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/>.
+
+*/
+
+
+#ifndef DCPOMATIC_PIECE_AUDIO_H
+#define DCPOMATIC_PIECE_AUDIO_H
+
+
+/** @file  src/lib/piece_audio.h
+ *  @brief PieceAudio class.
+ */
+
+
+#include "audio_buffers.h"
+#include "types.h"
+
+
+class AudioStream;
+
+
+/** @class PieceAudio
+ *  @brief A block of audio from a Piece, with a timestamp as a frame within that piece.
+ */
+class PieceAudio
+{
+public:
+	PieceAudio ()
+		: audio (new AudioBuffers(0, 0))
+	{}
+
+	PieceAudio (std::shared_ptr<AudioStream> s, std::shared_ptr<const AudioBuffers> a, Frame f)
+		: stream (s)
+		, audio (a)
+		, frame (f)
+	{}
+
+	std::shared_ptr<AudioStream> stream;
+	std::shared_ptr<const AudioBuffers> audio;
+	Frame frame = 0;
+};
+
+
+#endif