annotate examples/FixedTempoEstimator.h @ 198:e3e61b7e9661

* Beginnings of a simple tempo estimator example plugin

/* -*- 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 2006-2008 Chris Cannam and QMUL.
  
    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
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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:

    The above copyright notice and this permission notice shall be
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    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
    EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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    WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

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

#ifndef _FIXED_TEMPO_ESTIMATOR_PLUGIN_H_
#define _FIXED_TEMPO_ESTIMATOR_PLUGIN_H_

#include "vamp-sdk/Plugin.h"

/**
 * Example plugin that estimates the tempo of a short fixed-tempo sample.
 */

class FixedTempoEstimator : public Vamp::Plugin
{
public:
    FixedTempoEstimator(float inputSampleRate);
    virtual ~FixedTempoEstimator();

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

    InputDomain getInputDomain() const { return FrequencyDomain; }

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

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

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

    OutputList getOutputDescriptors() const;

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

    FeatureSet getRemainingFeatures();

protected:
    size_t m_stepSize;
    size_t m_blockSize;

    float *m_priorMagnitudes;

    size_t m_dfsize;
    float *m_df;
    size_t m_n;

    Vamp::RealTime m_start;
    Vamp::RealTime m_lasttime;

    FeatureSet calculateFeatures();
    float lag2tempo(int);
};


#endif