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67 lines
2.0 KiB
67 lines
2.0 KiB
/*
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Rosegarden
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A sequencer and musical notation editor.
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This program is Copyright 2000-2008
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Guillaume Laurent <glaurent@telegraph-road.org>,
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Chris Cannam <cannam@all-day-breakfast.com>,
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Richard Bown <bownie@bownie.com>
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The moral right of the authors to claim authorship of this work
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has been asserted.
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version. See the file
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COPYING included with this distribution for more information.
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*/
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#ifndef _EXTERNAL_TRANSPORT_H_
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#define _EXTERNAL_TRANSPORT_H_
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namespace Rosegarden {
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/**
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* Simple interface that we can pass to low-level audio code and on
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* which it can call back when something external requests a transport
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* change. The callback is asynchronous, and there's a method for the
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* low-level code to use to find out whether its request has finished
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* synchronising yet.
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*
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* (Each of the transportXX functions returns a token which can then
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* be passed to isTransportSyncComplete.)
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*/
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class ExternalTransport
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{
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public:
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typedef unsigned long TransportToken;
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enum TransportRequest {
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TransportNoChange,
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TransportStop,
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TransportStart,
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TransportPlay,
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TransportRecord,
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TransportJumpToTime, // time arg required
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TransportStartAtTime, // time arg required
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TransportStopAtTime // time arg required
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};
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virtual TransportToken transportChange(TransportRequest) = 0;
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virtual TransportToken transportJump(TransportRequest, RealTime) = 0;
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virtual bool isTransportSyncComplete(TransportToken token) = 0;
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// The value returned here is a constant (within the context of a
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// particular ExternalTransport object) that is guaranteed never
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// to be returned by any of the transport request methods.
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virtual TransportToken getInvalidTransportToken() const = 0;
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};
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}
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#endif
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