annotate transform/Transform.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 file copyright 2006-2007 Chris Cannam and QMUL.
   
    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.
*/

#ifndef _TRANSFORM_H_
#define _TRANSFORM_H_

#include "base/XmlExportable.h"
#include "base/Window.h"
#include "base/RealTime.h"

#include <vamp-hostsdk/PluginBase.h>

#include <QString>

#include <map>

typedef QString TransformId;

class QXmlAttributes;

class Transform : public XmlExportable
{
public:
    /**
     * Construct a new Transform with default data and no identifier.
     * The Transform object will be meaningless until some data and an
     * identifier have been set on it.
     *
     * To construct a Transform for use with a particular transform
     * identifier, use TransformFactory::getDefaultTransformFor.
     */
    Transform();

    /**
     * Construct a Transform by parsing the given XML data string.
     * This is the inverse of toXml.
     */
    Transform(QString xml);

    virtual ~Transform();

    /**
     * Compare two Transforms.  They only compare equal if every data
     * element matches.
     */
    bool operator==(const Transform &) const;
    
    /**
     * Order two Transforms, so that they can be used as keys in
     * containers.
     */
    bool operator<(const Transform &) const;

    void setIdentifier(TransformId id);
    TransformId getIdentifier() const;

    enum Type { FeatureExtraction, RealTimeEffect };

    Type getType() const;
    QString getPluginIdentifier() const;
    QString getOutput() const;
    
    void setPluginIdentifier(QString pluginIdentifier);
    void setOutput(QString output);

    // Turn a plugin ID and output name into a transform ID.  Note
    // that our pluginIdentifier is the same thing as the Vamp SDK's
    // PluginLoader::PluginKey.
    static TransformId getIdentifierForPluginOutput(QString pluginIdentifier,
                                                    QString output = "");

    typedef std::map<QString, float> ParameterMap;
    
    const ParameterMap &getParameters() const;
    void setParameters(const ParameterMap &pm);
    void setParameter(QString name, float value);

    typedef std::map<QString, QString> ConfigurationMap;

    const ConfigurationMap &getConfiguration() const;
    void setConfiguration(const ConfigurationMap &cm);
    void setConfigurationValue(QString name, QString value);

    QString getPluginVersion() const;
    void setPluginVersion(QString version);

    QString getProgram() const;
    void setProgram(QString program);
    
    size_t getStepSize() const;
    void setStepSize(size_t s);
    
    size_t getBlockSize() const;
    void setBlockSize(size_t s);
    
    WindowType getWindowType() const;
    void setWindowType(WindowType type);
    
    RealTime getStartTime() const;
    void setStartTime(RealTime t);
    
    RealTime getDuration() const; // 0 -> all
    void setDuration(RealTime d);
    
    float getSampleRate() const; // 0 -> as input
    void setSampleRate(float rate);

    void toXml(QTextStream &stream, QString indent = "",
               QString extraAttributes = "") const;

    /**
     * Set the main transform data from the given XML attributes.
     * This does not set the parameters or configuration, which are
     * exported to separate XML elements rather than attributes of the
     * transform element.
     * 
     * Note that this only sets those attributes which are actually
     * present in the argument.  Any attributes not defined in the
     * attribute will remain unchanged in the Transform.  If your aim
     * is to create a transform exactly matching the given attributes,
     * ensure you start from an empty transform rather than one that
     * has already been configured.
     */
    void setFromXmlAttributes(const QXmlAttributes &);

protected:
    TransformId m_id; // pluginid:output, that is type:soname:label:output
    
    static QString createIdentifier
    (QString type, QString soName, QString label, QString output);

    static void parseIdentifier
    (QString identifier,
     QString &type, QString &soName, QString &label, QString &output);

    template <typename A, typename B>
    bool mapLessThan(const std::map<A, B> &a, const std::map<A, B> &b) const {
        // Return true if a is "less than" b.  Ordering doesn't have
        // to be meaningful, just consistent.
        typename std::map<A, B>::const_iterator i;
        typename std::map<A, B>::const_iterator j;
        for (i = a.begin(), j = b.begin(); i != a.end(); ++i) {
            if (j == b.end()) return false; // a is longer than b
            if (i->first != j->first) return i->first < j->first;
            if (i->second != j->second) return i->second < j->second;
        }
        if (j != b.end()) return true; // a is shorter than b
        return false; // equal
    }

    ParameterMap m_parameters;
    ConfigurationMap m_configuration;
    QString m_pluginVersion;
    QString m_program;
    size_t m_stepSize;
    size_t m_blockSize;
    WindowType m_windowType;
    RealTime m_startTime;
    RealTime m_duration;
    float m_sampleRate;
};

#endif