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/*
Rosegarden
A 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 right of the authors to claim authorship of this work
has been asserted.
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 _EXTERNAL_TRANSPORT_H_
#define _EXTERNAL_TRANSPORT_H_
namespace Rosegarden {
/**
* Simple interface that we can pass to low-level audio code and on
* which it can call back when something external requests a transport
* change. The callback is asynchronous, and there's a method for the
* low-level code to use to find out whether its request has finished
* synchronising yet.
*
* (Each of the transportXX functions returns a token which can then
* be passed to isTransportSyncComplete.)
*/
class ExternalTransport
{
public:
typedef unsigned long TransportToken;
enum TransportRequest {
TransportNoChange,
TransportStop,
TransportStart,
TransportPlay,
TransportRecord,
TransportJumpToTime, // time arg required
TransportStartAtTime, // time arg required
TransportStopAtTime // time arg required
};
virtual TransportToken transportChange(TransportRequest) = 0;
virtual TransportToken transportJump(TransportRequest, RealTime) = 0;
virtual bool isTransportSyncComplete(TransportToken token) = 0;
// The value returned here is a constant (within the context of a
// particular ExternalTransport object) that is guaranteed never
// to be returned by any of the transport request methods.
virtual TransportToken getInvalidTransportToken() const = 0;
};
}
#endif
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