annotate vamp-sdk/PluginAdapter.h @ 193:20393d30baee

* Add hasDuration to output in ontology

/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */

/*
    Vamp

    An API for audio analysis and feature extraction plugins.

    Centre for Digital Music, Queen Mary, University of London.
    Copyright 2006 Chris Cannam.
  
    Permission is hereby granted, free of charge, to any person
    obtaining a copy of this software and associated documentation
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    of the Software, and to permit persons to whom the Software is
    furnished to do so, subject to the following conditions:

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    Except as contained in this notice, the names of the Centre for
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*/

#ifndef _VAMP_PLUGIN_ADAPTER_H_
#define _VAMP_PLUGIN_ADAPTER_H_

#include <vamp/vamp.h>

#include "Plugin.h"

#include <map>

namespace Vamp {

/**
 * \class PluginAdapterBase PluginAdapter.h <vamp-sdk/PluginAdapter.h>
 * 
 * PluginAdapter and PluginAdapterBase provide a wrapper class that a
 * plugin library can use to make its C++ Vamp::Plugin objects
 * available through the Vamp C API.
 * 
 * Almost all Vamp plugin libraries will want to make use of this.  To
 * do so, all they need to do is declare a PluginAdapter<T> for each
 * plugin class T in their library.  It's very simple, and you need to
 * know absolutely nothing about how it works in order to use it.
 * Just cut and paste from an existing plugin's discovery function.
 * \see vampGetPluginDescriptor
 */

class PluginAdapterBase
{
public:
    virtual ~PluginAdapterBase();

    /**
     * Return a VampPluginDescriptor describing the plugin that is
     * wrapped by this adapter.
     */
    const VampPluginDescriptor *getDescriptor();

protected:
    PluginAdapterBase();

    virtual Plugin *createPlugin(float inputSampleRate) = 0;

    class Impl;
    Impl *m_impl;
};

/**
 * \class PluginAdapter PluginAdapter.h <vamp-sdk/PluginAdapter.h>
 * 
 * PluginAdapter turns a PluginAdapterBase into a specific wrapper for
 * a particular plugin implementation.
 *
 * See PluginAdapterBase.
 */

template <typename P>
class PluginAdapter : public PluginAdapterBase
{
public:
    PluginAdapter() : PluginAdapterBase() { }
    virtual ~PluginAdapter() { }

protected:
    Plugin *createPlugin(float inputSampleRate) {
        P *p = new P(inputSampleRate);
        Plugin *plugin = dynamic_cast<Plugin *>(p);
        if (!plugin) {
            std::cerr << "ERROR: PluginAdapter::createPlugin: "
                      << "Template type is not a plugin!"
                      << std::endl;
            delete p;
            return 0;
        }
        return plugin;
    }
};
    
}

#endif