view plugin/DSSIPluginInstance.h @ 6:44bbf5793d84

* Rework handling of layer properties in file I/O -- we now get the individual
  layers to load and save them rather than doing it via generic property lists
  in the base class, so as to ensure we read and write meaningful values rather
  than generic int values requiring conversion.

/* -*- c-basic-offset: 4 -*-  vi:set ts=8 sts=4 sw=4: */

/*
    A waveform viewer and audio annotation editor.
    Chris Cannam, Queen Mary University of London, 2005-2006
    
    This is experimental software.  Not for distribution.
*/

/*
   This is a modified version of a source file from the 
   Rosegarden MIDI and audio sequencer and notation editor.
   This file copyright 2000-2005 Chris Cannam.
*/

#ifndef _DSSIPLUGININSTANCE_H_
#define _DSSIPLUGININSTANCE_H_

#define DSSI_API_LEVEL 2

#include <vector>
#include <set>
#include <map>
#include <QString>
#include <QMutex>
#include <QThread>

#include "api/dssi.h"

#include "base/RingBuffer.h"
#include "RealTimePluginInstance.h"
#include "base/Scavenger.h"

class DSSIPluginInstance : public RealTimePluginInstance
{
public:
    virtual ~DSSIPluginInstance();

    virtual bool isOK() const { return m_instanceHandle != 0; }

    int getClientId() const { return m_client; }
    virtual QString getIdentifier() const { return m_identifier; }
    int getPosition() const { return m_position; }

    virtual void run(const RealTime &);

    virtual unsigned int getParameterCount() const;
    virtual void setParameterValue(unsigned int parameter, float value);
    virtual float getParameterValue(unsigned int parameter) const;
    virtual float getParameterDefault(unsigned int parameter) const;
    virtual QString configure(QString key, QString value);
    virtual void sendEvent(const RealTime &eventTime,
			   const void *event);

    virtual size_t getBufferSize() const { return m_blockSize; }
    virtual size_t getAudioInputCount() const { return m_audioPortsIn.size(); }
    virtual size_t getAudioOutputCount() const { return m_idealChannelCount; }
    virtual sample_t **getAudioInputBuffers() { return m_inputBuffers; }
    virtual sample_t **getAudioOutputBuffers() { return m_outputBuffers; }

    virtual QStringList getPrograms() const;
    virtual QString getCurrentProgram() const;
    virtual QString getProgram(int bank, int program) const;
    virtual unsigned long getProgram(QString name) const;
    virtual void selectProgram(QString program);

    virtual bool isBypassed() const { return m_bypassed; }
    virtual void setBypassed(bool bypassed) { m_bypassed = bypassed; }

    virtual size_t getLatency();

    virtual void silence();
    virtual void discardEvents();
    virtual void setIdealChannelCount(size_t channels); // may re-instantiate

    virtual bool isInGroup() const { return m_grouped; }
    virtual void detachFromGroup();

protected:
    // To be constructed only by DSSIPluginFactory
    friend class DSSIPluginFactory;

    // Constructor that creates the buffers internally
    // 
    DSSIPluginInstance(RealTimePluginFactory *factory,
		       int client,
		       QString identifier,
		       int position,
		       unsigned long sampleRate,
		       size_t blockSize,
		       int idealChannelCount,
		       const DSSI_Descriptor* descriptor);
    
    // Constructor that uses shared buffers
    // 
    DSSIPluginInstance(RealTimePluginFactory *factory,
		       int client,
		       QString identifier,
		       int position,
		       unsigned long sampleRate,
		       size_t blockSize,
		       sample_t **inputBuffers,
		       sample_t **outputBuffers,
		       const DSSI_Descriptor* descriptor);

    void init();
    void instantiate(unsigned long sampleRate);
    void cleanup();
    void activate();
    void deactivate();
    void connectPorts();

    bool handleController(snd_seq_event_t *ev);
    void setPortValueFromController(unsigned int portNumber, int controlValue);
    void selectProgramAux(QString program, bool backupPortValues);
    void checkProgramCache() const;

    void initialiseGroupMembership();
    void runGrouped(const RealTime &);

    // For use in DSSIPluginFactory (set in the DSSI_Host_Descriptor):
    static int requestMidiSend(LADSPA_Handle instance,
			       unsigned char ports,
			       unsigned char channels);
    static void midiSend(LADSPA_Handle instance,
			 snd_seq_event_t *events,
			 unsigned long eventCount);
    static int requestNonRTThread(LADSPA_Handle instance,
				  void (*runFunction)(LADSPA_Handle));

    int                        m_client;
    int                        m_position;
    LADSPA_Handle              m_instanceHandle;
    const DSSI_Descriptor     *m_descriptor;

    std::vector<std::pair<unsigned long, LADSPA_Data*> > m_controlPortsIn;
    std::vector<std::pair<unsigned long, LADSPA_Data*> > m_controlPortsOut;

    std::vector<LADSPA_Data>  m_backupControlPortsIn;

    std::map<int, int>        m_controllerMap;

    std::vector<int>          m_audioPortsIn;
    std::vector<int>          m_audioPortsOut;

    struct ProgramControl {
	int msb;
	int lsb;
	int program;
    };
    ProgramControl m_pending;

    struct ProgramDescriptor {
	int bank;
	int program;
	QString name;
    };
    mutable std::vector<ProgramDescriptor> m_cachedPrograms;
    mutable bool m_programCacheValid;

    RingBuffer<snd_seq_event_t> m_eventBuffer;

    size_t                    m_blockSize;
    sample_t                **m_inputBuffers;
    sample_t                **m_outputBuffers;
    bool                      m_ownBuffers;
    size_t                    m_idealChannelCount;
    size_t                    m_outputBufferCount;
    size_t                    m_sampleRate;
    float                    *m_latencyPort;
    bool                      m_run;
    
    bool                      m_bypassed;
    QString                   m_program;
    bool                      m_grouped;
    RealTime                  m_lastRunTime;

    QMutex                    m_processLock;

    typedef std::set<DSSIPluginInstance *> PluginSet;
    typedef std::map<QString, PluginSet> GroupMap;
    static GroupMap m_groupMap;
    static snd_seq_event_t **m_groupLocalEventBuffers;
    static size_t m_groupLocalEventBufferCount;

    static Scavenger<ScavengerArrayWrapper<snd_seq_event_t *> > m_bufferScavenger;

    class NonRTPluginThread : public QThread
    {
    public:
	NonRTPluginThread(LADSPA_Handle handle,
			  void (*runFunction)(LADSPA_Handle)) :
	    m_handle(handle),
	    m_runFunction(runFunction),
	    m_exiting(false) { }

	virtual void run();
	void setExiting() { m_exiting = true; }

    protected:
	LADSPA_Handle m_handle;
	void (*m_runFunction)(LADSPA_Handle);
	bool m_exiting;
    };
    static std::map<LADSPA_Handle, std::set<NonRTPluginThread *> > m_threads;
};

#endif // _DSSIPLUGININSTANCE_H_