annotate plugin/RealTimePluginInstance.h @ 537:3cc4b7cd2aa5

* Merge from one-fftdataserver-per-fftmodel branch.  This bit of
reworking (which is not described very accurately by the title of
the branch) turns the MatrixFile object into something that either
reads or writes, but not both, and separates the FFT file cache
reader and writer implementations separately.  This allows the
FFT data server to have a single thread owning writers and one reader
per "customer" thread, and for all locking to be vastly simplified
and concentrated in the data server alone (because none of the
classes it makes use of is used in more than one thread at a time).
The result is faster and more trustworthy code.

/* -*- 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 _REALTIME_PLUGIN_INSTANCE_H_
#define _REALTIME_PLUGIN_INSTANCE_H_

#include <vamp-hostsdk/PluginBase.h>
#include <vamp-hostsdk/RealTime.h>

#include <QString>
#include <QStringList>
#include <vector>
#include <string>
#include <map>

#include "base/AudioPlaySource.h"

class RealTimePluginFactory;
	
/**
 * RealTimePluginInstance is an interface that an audio process can
 * use to refer to an instance of a plugin without needing to know
 * what type of plugin it is.
 *
 * The audio code calls run() on an instance that has been passed to
 * it, and assumes that the passing code has already initialised the
 * plugin, connected its inputs and outputs and so on, and that there
 * is an understanding in place about the sizes of the buffers in use
 * by the plugin.  All of this depends on the subclass implementation.
 *
 * The PluginInstance base class includes additional abstract methods
 * which the subclass of RealTimePluginInstance must implement.
 */

/*
 * N.B. RealTimePluginInstance, RealTimePluginFactory and their
 * subclasses are terrible code.  They've been reused, cut and pasted
 * and mangled too many times to fit too many different uses, and
 * could do with a good tidy.
 */

// These names are taken from LADSPA, but the values are not
// guaranteed to match

namespace PortType { // ORable
    static const int Input   = 1;
    static const int Output  = 2;
    static const int Control = 4;
    static const int Audio   = 8;
}

namespace PortHint { // ORable
    static const int NoHint  = 0;
    static const int Toggled = 1;
    static const int Integer = 2;
    static const int Logarithmic = 4;
    static const int SampleRate = 8;
}

class RealTimePluginInstance : public Vamp::PluginBase, public Auditionable
{
public:
    typedef float sample_t;

    virtual ~RealTimePluginInstance();

    virtual bool isOK() const = 0;

    virtual QString getPluginIdentifier() const = 0;

    /**
     * Run for one block, starting at the given time.  The start time
     * may be of interest to synths etc that may have queued events
     * waiting.  Other plugins can ignore it.  The count, if zero,
     * defaults to our fixed buffer size.
     */
    virtual void run(const Vamp::RealTime &blockStartTime,
                     size_t count = 0) = 0;
    
    virtual size_t getBufferSize() const = 0;

    virtual size_t getAudioInputCount() const = 0;
    virtual size_t getAudioOutputCount() const = 0;

    virtual sample_t **getAudioInputBuffers() = 0;
    virtual sample_t **getAudioOutputBuffers() = 0;

    // Control inputs are known as parameters here
    virtual size_t getControlOutputCount() const = 0;
    virtual float getControlOutputValue(size_t n) const = 0;

//     virtual QStringList getPrograms() const { return QStringList(); }
//     virtual QString getCurrentProgram() const { return QString(); }
    virtual std::string getProgram(int /* bank */, int /* program */) const { return std::string(); }
//     virtual unsigned long getProgram(QString /* name */) const { return 0; } // bank << 16 + program
//     virtual void selectProgram(QString) { }

    virtual unsigned int getParameterCount() const = 0;
    virtual void setParameterValue(unsigned int parameter, float value) = 0;
    virtual float getParameterValue(unsigned int parameter) const = 0;
    virtual float getParameterDefault(unsigned int parameter) const = 0;
    virtual int getParameterDisplayHint(unsigned int parameter) const = 0;

    virtual std::string configure(std::string /* key */, std::string /* value */) { return std::string(); }

    virtual void sendEvent(const Vamp::RealTime & /* eventTime */,
			   const void * /* event */) { }
    virtual void clearEvents() { }

    virtual bool isBypassed() const = 0;
    virtual void setBypassed(bool value) = 0;

    // This should be called after setup, but while not actually playing.
    virtual size_t getLatency() = 0;

    virtual void silence() = 0;
    virtual void discardEvents() { }
    virtual void setIdealChannelCount(size_t channels) = 0; // must also silence(); may also re-instantiate

    void setFactory(RealTimePluginFactory *f) { m_factory = f; } // ew

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

    typedef std::map<std::string, std::string> ConfigurationPairMap;
    virtual ConfigurationPairMap getConfigurePairs() {
        return m_configurationData;
    }

protected:
    RealTimePluginInstance(RealTimePluginFactory *factory, QString identifier) :
	m_factory(factory), m_identifier(identifier) { }

    RealTimePluginFactory *m_factory;
    QString m_identifier;

    ConfigurationPairMap m_configurationData;

    friend class PluginFactory;
};


#endif