annotate vamp-hostsdk/PluginHostAdapter.h @ 56:4ab6224110ef host-factory-stuff

* implement plugin loader and plugin input-domain adapter (to do basic ffts)

/* -*- 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
    files (the "Software"), to deal in the Software without
    restriction, including without limitation the rights to use, copy,
    modify, merge, publish, distribute, sublicense, and/or sell copies
    of the Software, and to permit persons to whom the Software is
    furnished to do so, subject to the following conditions:

    The above copyright notice and this permission notice shall be
    included in all copies or substantial portions of the Software.

    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
    EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
    MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
    NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR
    ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
    CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
    WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

    Except as contained in this notice, the names of the Centre for
    Digital Music; Queen Mary, University of London; and Chris Cannam
    shall not be used in advertising or otherwise to promote the sale,
    use or other dealings in this Software without prior written
    authorization.
*/

#ifndef _VAMP_PLUGIN_HOST_ADAPTER_H_
#define _VAMP_PLUGIN_HOST_ADAPTER_H_

#include <vamp/vamp.h>
#include <vamp-sdk/Plugin.h>

#include <vector>

namespace Vamp {

/**
 * PluginHostAdapter is a wrapper class that a Vamp host can use to
 * make the C-language VampPluginDescriptor object appear as a C++
 * Vamp::Plugin object.
 *
 * The Vamp API is defined in vamp/vamp.h as a C API.  The C++ objects
 * used for convenience by plugins and hosts actually communicate
 * using the C low-level API, but the details of this communication
 * are handled seamlessly by the Vamp SDK implementation provided the
 * plugin and host use the proper C++ wrapper objects.
 *
 * See also PluginAdapter, the plugin-side wrapper that makes a C++
 * plugin object available using the C query API.
 */

class PluginHostAdapter : public Plugin
{
public:
    PluginHostAdapter(const VampPluginDescriptor *descriptor,
                      float inputSampleRate);
    virtual ~PluginHostAdapter();
    
    static std::vector<std::string> getPluginPath();

    bool initialise(size_t channels, size_t stepSize, size_t blockSize);
    void reset();

    InputDomain getInputDomain() const;

    unsigned int getVampApiVersion() const;
    std::string getIdentifier() const;
    std::string getName() const;
    std::string getDescription() const;
    std::string getMaker() const;
    int getPluginVersion() const;
    std::string getCopyright() const;

    ParameterList getParameterDescriptors() const;
    float getParameter(std::string) const;
    void setParameter(std::string, float);

    ProgramList getPrograms() const;
    std::string getCurrentProgram() const;
    void selectProgram(std::string);

    size_t getPreferredStepSize() const;
    size_t getPreferredBlockSize() const;

    size_t getMinChannelCount() const;
    size_t getMaxChannelCount() const;

    OutputList getOutputDescriptors() const;

    FeatureSet process(const float *const *inputBuffers, RealTime timestamp);

    FeatureSet getRemainingFeatures();

protected:
    void convertFeatures(VampFeatureList *, FeatureSet &);

    const VampPluginDescriptor *m_descriptor;
    VampPluginHandle m_handle;
};

}

#endif