playthread.h

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/*
    MIDI Sequencer C++ library
    Copyright (C) 2006-2023, Pedro Lopez-Cabanillas <plcl@users.sf.net>
 
    This library 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 3 of the License, or
    (at your option) any later version.
 
    This library 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, see <http://www.gnu.org/licenses/>.
*/
 
#ifndef DRUMSTICK_PLAYTHREAD_H
#define DRUMSTICK_PLAYTHREAD_H
 
#include "alsaevent.h"
#include <QThread>
#include <QReadWriteLock>
 
namespace drumstick { namespace ALSA {
 
#if defined(DRUMSTICK_STATIC)
#define DRUMSTICK_ALSA_EXPORT
#else
#if defined(drumstick_alsa_EXPORTS)
#define DRUMSTICK_ALSA_EXPORT Q_DECL_EXPORT
#else
#define DRUMSTICK_ALSA_EXPORT Q_DECL_IMPORT
#endif
#endif
 
class MidiClient;
class MidiQueue;
 
class DRUMSTICK_ALSA_EXPORT SequencerOutputThread : public QThread
{
    Q_OBJECT
 
public:
    SequencerOutputThread(MidiClient *seq, int portId);
    virtual void run() override;
    virtual unsigned int getInitialPosition() { return 0; }
    virtual unsigned int getEchoResolution() { return 0; }
    virtual bool hasNext() = 0;
    virtual SequencerEvent* nextEvent() = 0;
 
    virtual void stop();
 
Q_SIGNALS:
    void playbackFinished();
 
    void playbackStopped();
 
public Q_SLOTS:
    void start( QThread::Priority priority = InheritPriority );
 
protected:
    virtual void sendEchoEvent(int tick);
    virtual void sendSongEvent(SequencerEvent* ev);
    virtual void drainOutput();
    virtual void syncOutput();
    virtual bool stopRequested();
 
    MidiClient *m_MidiClient;   
    MidiQueue *m_Queue;         
    int m_PortId;               
    bool m_Stopped;             
    int m_QueueId;              
    int m_npfds;                
    pollfd* m_pfds;             
    QReadWriteLock m_mutex;     
};
 
}} /* namespace drumstick::ALSA */
 
#endif /*DRUMSTICK_PLAYTHREAD_H*/