view plugin/DSSIPluginInstance.h @ 490:c3fb8258e34d

* Make it possible to import an entire session from an RDF document.
  However, at the moment the timings of events appear to be constrained
  by how far the audio decoder has got through its audio file at the
  time the event is queried -- need to investigate.

/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */

/*
    Sonic Visualiser
    An audio file viewer and annotation editor.
    Centre for Digital Music, Queen Mary, University of London.
    
    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.
*/

/*
   This is a modified version of a source file from the 
   Rosegarden MIDI and audio sequencer and notation editor.
   This file copyright 2000-2006 Chris Cannam.
*/

#ifndef _DSSIPLUGININSTANCE_H_
#define _DSSIPLUGININSTANCE_H_

#define DSSI_API_LEVEL 2

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

#include "api/dssi.h"

#include "base/RingBuffer.h"
#include "base/Thread.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 getPluginIdentifier() const { return m_identifier; }
    int getPosition() const { return m_position; }

    virtual std::string getIdentifier() const;
    virtual std::string getName() const;
    virtual std::string getDescription() const;
    virtual std::string getMaker() const;
    virtual int getPluginVersion() const;
    virtual std::string getCopyright() const;

    virtual void run(const Vamp::RealTime &, size_t count = 0);

    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 int getParameterDisplayHint(unsigned int parameter) const;

    virtual ParameterList getParameterDescriptors() const;
    virtual float getParameter(std::string) const;
    virtual void setParameter(std::string, float);

    virtual std::string configure(std::string key, std::string value);
    virtual void sendEvent(const Vamp::RealTime &eventTime,
			   const void *event);
    virtual void clearEvents();

    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 size_t getControlOutputCount() const { return m_controlPortsOut.size(); }
    virtual float getControlOutputValue(size_t n) const;

    virtual ProgramList getPrograms() const;
    virtual std::string getCurrentProgram() const;
    virtual std::string getProgram(int bank, int program) const;
    virtual unsigned long getProgram(std::string name) const;
    virtual void selectProgram(std::string 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();

    virtual std::string getType() const { return "DSSI Real-Time Plugin"; }

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);
    
    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(std::string program, bool backupPortValues);
    void checkProgramCache() const;

    void initialiseGroupMembership();
    void runGrouped(const Vamp::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;
	std::string 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;
    std::string               m_program;
    bool                      m_grouped;
    Vamp::RealTime            m_lastRunTime;

    Vamp::RealTime            m_lastEventSendTime;
    bool                      m_haveLastEventSendTime;

    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 Thread
    {
    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_