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diff --git a/src/sound/AudioFileTimeStretcher.h b/src/sound/AudioFileTimeStretcher.h
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+/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*- vi:set ts=8 sts=4 sw=4: */
+
+/*
+    Rosegarden
+    A MIDI and audio sequencer and musical notation editor.
+
+    This program is Copyright 2000-2008
+        Guillaume Laurent   <[email protected]>,
+        Chris Cannam        <[email protected]>,
+        Richard Bown        <[email protected]>
+
+    The moral rights of Guillaume Laurent, Chris Cannam, and Richard
+    Bown to claim authorship of this work have been asserted.
+
+    Other copyrights also apply to some parts of this work.  Please
+    see the AUTHORS file and individual file headers for details.
+
+    This program 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.  See the file
+    COPYING included with this distribution for more information.
+*/
+
+#ifndef _AUDIO_FILE_TIME_STRETCHER_H_
+#define _AUDIO_FILE_TIME_STRETCHER_H_
+
+#include <qobject.h>
+#include "AudioFile.h"
+#include "base/Exception.h"
+
+namespace Rosegarden {
+
+class AudioFileManager;
+
+class AudioFileTimeStretcher : public QObject
+{
+    Q_OBJECT
+    
+public:
+    AudioFileTimeStretcher(AudioFileManager *mgr);
+    virtual ~AudioFileTimeStretcher();
+
+    /**
+     * Stretch an audio file and return the ID of the stretched
+     * version.  May throw SoundFile::BadSoundFileException,
+     * AudioFileManager::BadAudioPathException, CancelledException
+     */
+    AudioFileId getStretchedAudioFile(AudioFileId source,
+                                      float ratio);
+
+    class CancelledException : public Exception
+    {
+    public:
+	CancelledException() : Exception("Cancelled") { }
+	~CancelledException() throw() { }
+    };
+
+signals:
+    void setProgress(int);
+
+public slots:
+    /**
+     * Cancel an ongoing getStretchedAudioFile
+     */
+    void slotStopTimestretch();
+    
+protected:
+    AudioFileManager *m_manager;
+
+    bool m_timestretchCancelled;
+};
+
+}
+
+#endif