annotate transform/TransformDescription.h @ 1376:d9511f9e04d7 dev/refactor-piper-related

Introduce some POD structs for describing an external server application and the desired libraries to load from it, and disambiguating between empty list request and invalid list request. This allows for overriding PiperVampPluginFactory behaviour for using a PluginScan to populate the list request.

/* -*- 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_DESCRIPTION_H_
#define _TRANSFORM_DESCRIPTION_H_

#include "Transform.h"

#include <QString>

#include <vector>

/**
 * Metadata associated with a transform.
 *
 * The transform ID is the same as that used in the Transform class.
 * It is intended to be computer-referenceable and unique within the
 * application.
 * 
 * The name is intended to be human readable.  In principle it doesn't
 * have to be unique, but the factory that creates these objects
 * should add suffixes to ensure that it is, all the same (just to
 * avoid user confusion).
 *
 * The friendly name is a shorter version of the name.
 *
 * The type is also intended to be user-readable, for use in menus.
 *
 * To obtain these objects, use
 * TransformFactory::getAllTransformDescriptions and
 * TransformFactory::getTransformDescription.
 */

struct TransformDescription
{
    enum Type {
        Analysis,    // e.g. vamp plugin output
        Effects,     // e.g. ladspa plugin with audio in and out
        EffectsData, // e.g. control output of ladspa plugin
        Generator,   // e.g. audio out of ladspa plugin with no audio in
        UnknownType
    };

    TransformDescription() : 
        type(UnknownType), configurable(false) { }
    TransformDescription(Type _type, QString _category,
                         TransformId _identifier, QString _name,
                         QString _friendlyName, QString _description,
                         QString _longDescription,
                         QString _maker, QString _units, bool _configurable) :
        type(_type), category(_category),
        identifier(_identifier), name(_name),
        friendlyName(_friendlyName), description(_description),
        longDescription(_longDescription),
        maker(_maker), units(_units), configurable(_configurable) { }

    Type type;
    QString category; // e.g. time > onsets
    TransformId identifier; // e.g. vamp:vamp-aubio:aubioonset
    QString name; // plugin's name if 1 output, else "name: output"
    QString friendlyName; // short text for layer name
    QString description; // sentence describing transform
    QString longDescription; // description "using" plugin name "by" maker
    QString maker;
    QString infoUrl;
    QString units;
    bool configurable;
    
    bool operator<(const TransformDescription &od) const {
        return
            (name <  od.name) ||
            (name == od.name && identifier < od.identifier);
    };
};

typedef std::vector<TransformDescription> TransformList;

#endif