jack2/common/JackTimedDriver.h

/*
Copyright (C) 2001 Paul Davis
Copyright (C) 2004-2008 Grame

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.

This program 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 this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

*/

#ifndef __JackTimedDriver__
#define __JackTimedDriver__

#include "JackAudioDriver.h"

namespace Jack
{

/*!
\brief The timed driver.
*/

class SERVER_EXPORT JackTimedDriver : public JackAudioDriver
{
    protected:

        int fCycleCount;
        jack_time_t fAnchorTimeUsec;

        int FirstCycle(jack_time_t cur_time);
        int CurrentCycle(jack_time_t cur_time);

        void ProcessWait();

    public:

        JackTimedDriver(const char* name, const char* alias, JackLockedEngine* engine, JackSynchro* table)
                : JackAudioDriver(name, alias, engine, table), fCycleCount(0), fAnchorTimeUsec(0)
        {}
        virtual ~JackTimedDriver()
        {}

        // BufferSize can be changed
        bool IsFixedBufferSize()
        {
            return false;
        }

        int Start();

};

class SERVER_EXPORT JackWaiterDriver : public JackTimedDriver
{

    public:

        JackWaiterDriver(const char* name, const char* alias, JackLockedEngine* engine, JackSynchro* table)
            : JackTimedDriver(name, alias, engine, table)
        {}
        virtual ~JackWaiterDriver()
        {}

        virtual int ProcessNull();

};

/*!
\brief A restartable driver.

When wrapped into a JackWaitCallbackDriver, this driver can restart the
wrapper thread which will wait again for the Initialize method to return.
*/
class SERVER_EXPORT JackRestarterDriver : public JackWaiterDriver
{

    private:

        JackDriver* fRestartDriver; /*!< The wrapper driver */

    public:

        JackRestarterDriver(const char* name, const char* alias, JackLockedEngine* engine, JackSynchro* table)
            : JackWaiterDriver(name, alias, engine, table), fRestartDriver(NULL)
        {}
        virtual ~JackRestarterDriver()
        {}

        void SetRestartDriver(JackDriver* driver); /*!< Let the wrapper register itself */
        int RestartWait(); /*!< Restart the wrapper thread */

};

} // end of namespace

#endif