annotate plugin/FeatureExtractionPluginFactory.h @ 1211:5a1198083d9a piper

Pull out model creation into the transformer thread run(), so that all communications with the plugin server happen on a single thread. Then make the model accessor wait for them to be created (which still happens right at the start of processing) before returning.

/* -*- 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 Chris Cannam.
    
    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 _FEATURE_EXTRACTION_PLUGIN_FACTORY_H_
#define _FEATURE_EXTRACTION_PLUGIN_FACTORY_H_

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

#include <vamp-hostsdk/Plugin.h>

#include "base/Debug.h"
#include "base/BaseTypes.h"

#include "vamp-client/ProcessQtTransport.h"
#include "vamp-client/CapnpRRClient.h"

class FeatureExtractionPluginFactory
{
public:
    FeatureExtractionPluginFactory();
    virtual ~FeatureExtractionPluginFactory() { }

    static FeatureExtractionPluginFactory *instance(QString pluginType);
    static FeatureExtractionPluginFactory *instanceFor(QString identifier);
    static std::vector<QString> getAllPluginIdentifiers();

    virtual std::vector<QString> getPluginIdentifiers();

    // We don't set blockSize or channels on this -- they're
    // negotiated and handled via initialize() on the plugin
    virtual Vamp::Plugin *instantiatePlugin(QString identifier,
                                            sv_samplerate_t inputSampleRate);

    /**
     * Get category metadata about a plugin (without instantiating it).
     */
    virtual QString getPluginCategory(QString identifier);

protected:
    std::string m_serverName;
    
    piper_vamp::client::ProcessQtTransport m_transport;
    piper_vamp::client::CapnpRRClient m_client;

    QMutex m_mutex;
    std::vector<piper_vamp::PluginStaticData> m_pluginData;
    void populate();
};

#endif