view plugin/LADSPAPluginInstance.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 and Richard Bown.
*/

#ifndef _LADSPAPLUGININSTANCE_H_
#define _LADSPAPLUGININSTANCE_H_

#include <vector>
#include <set>
#include <QString>

#include "api/ladspa.h"
#include "RealTimePluginInstance.h"

// LADSPA plugin instance.  LADSPA is a variable block size API, but
// for one reason and another it's more convenient to use a fixed
// block size in this wrapper.
//
class LADSPAPluginInstance : public RealTimePluginInstance
{
public:
    virtual ~LADSPAPluginInstance();

    virtual bool isOK() const { return m_instanceHandles.size() != 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 &rt);

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

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

    virtual size_t getLatency();

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

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

    // Constructor that creates the buffers internally
    // 
    LADSPAPluginInstance(RealTimePluginFactory *factory,
			 int client,
			 QString identifier,
                         int position,
			 unsigned long sampleRate,
			 size_t blockSize,
			 int idealChannelCount,
                         const LADSPA_Descriptor* descriptor);

    // Constructor that uses shared buffers
    // 
    LADSPAPluginInstance(RealTimePluginFactory *factory,
			 int client,
			 QString identifier,
                         int position,
			 unsigned long sampleRate,
			 size_t blockSize,
			 sample_t **inputBuffers,
			 sample_t **outputBuffers,
                         const LADSPA_Descriptor* descriptor);

    void init(int idealChannelCount = 0);
    void instantiate(unsigned long sampleRate);
    void cleanup();
    void activate();
    void deactivate();

    // Connection of data (and behind the scenes control) ports
    //
    void connectPorts();
    
    int                        m_client;
    int                        m_position;
    std::vector<LADSPA_Handle> m_instanceHandles;
    size_t                     m_instanceCount;
    const LADSPA_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<int>          m_audioPortsIn;
    std::vector<int>          m_audioPortsOut;

    size_t                    m_blockSize;
    sample_t                **m_inputBuffers;
    sample_t                **m_outputBuffers;
    bool                      m_ownBuffers;
    size_t                    m_sampleRate;
    float                    *m_latencyPort;
    bool                      m_run;
    
    bool                      m_bypassed;
};

#endif // _LADSPAPLUGININSTANCE_H_