BeatRoot Vamp Plugin

    m_processor = new BeatRootProcessor(inputSampleRate, AgentParameters());

    ParameterDescriptor desc;

    double postMarginFactor;

    /** The maximum amount by which a beat can be earlier than the

     *  predicted beat time, expressed as a fraction of the beat

     *  period. */

    double preMarginFactor;

    /** The maximum allowed deviation from the initial tempo,

     * expressed as a fraction of the initial beat period. */

    double maxChange;

    /** The default value of expiryTime, which is the time (in

     *  seconds) after which an Agent that has no Event matching its

     *  beat predictions will be destroyed. */

    desc.identifier = "preMarginFactor";

    desc.name = "Pre-Margin Factor";

    desc.description = "The maximum amount by which a beat can be earlier than the predicted beat time, expressed as a fraction of the beat period.";

    desc.minValue = 0;

    desc.maxValue = 1;

    desc.defaultValue = AgentParameters::DEFAULT_PRE_MARGIN_FACTOR;

    desc.isQuantized = false;

    list.push_back(desc);

    desc.identifier = "postMarginFactor";

    desc.name = "Post-Margin Factor";

    desc.description = "The maximum amount by which a beat can be later than the predicted beat time, expressed as a fraction of the beat period.";

    desc.minValue = 0;

    desc.maxValue = 1;

    desc.defaultValue = AgentParameters::DEFAULT_POST_MARGIN_FACTOR;

    desc.isQuantized = false;

    list.push_back(desc);

    desc.identifier = "maxChange";

    desc.name = "Maximum Change";

    desc.description = "The maximum allowed deviation from the initial tempo, expressed as a fraction of the initial beat period.";

    desc.minValue = 0;

    desc.maxValue = 1;

    desc.defaultValue = AgentParameters::DEFAULT_MAX_CHANGE;

    desc.isQuantized = false;

    list.push_back(desc);

    desc.identifier = "expiryTime";

    desc.name = "Expiry Time";

    desc.description = "The default value of expiryTime, which is the time (in seconds) after which an Agent that has no Event matching its beat predictions will be destroyed.";

    desc.minValue = 2;

    desc.maxValue = 120;

    desc.defaultValue = AgentParameters::DEFAULT_EXPIRY_TIME;

    desc.isQuantized = false;

    list.push_back(desc);

    // Simon says...

    // These are the parameters that should be exposed (Agent.cpp):

    // If Pop, both margins should be lower (0.1).  If classical

    // music, post margin can be increased

    //

    // double Agent::POST_MARGIN_FACTOR = 0.3;

    // double Agent::PRE_MARGIN_FACTOR = 0.15;

    //

    // Max Change tells us how much tempo can change - so for

    // classical we should make it higher

    // 

    // double Agent::MAX_CHANGE = 0.2;

    // 

    // The EXPIRY TIME default should be defaulted to 100 (usual cause

    // of agents dying....)  it should also be exposed in order to

    // troubleshoot eventual problems in songs with big silences in

    // the beggining/end.

    // 

    // const double Agent::DEFAULT_EXPIRY_TIME = 10.0;

    if (identifier == "preMarginFactor") {

        return m_parameters.preMarginFactor;

    } else if (identifier == "postMarginFactor") {

        return m_parameters.postMarginFactor;

    } else if (identifier == "maxChange") {

        return m_parameters.maxChange;

    } else if (identifier == "expiryTime") {

        return m_parameters.expiryTime;

    }

    if (identifier == "preMarginFactor") {

        m_parameters.preMarginFactor = value;

    } else if (identifier == "postMarginFactor") {

        m_parameters.postMarginFactor = value;

    } else if (identifier == "maxChange") {

        m_parameters.maxChange = value;

    } else if (identifier == "expiryTime") {

        m_parameters.expiryTime = value;

    }

    // Delete the processor that was created with default parameters

    // and used to determine the expected step and block size; replace

    // with one using the actual parameters we have

    delete m_processor;

    m_processor = new BeatRootProcessor(m_inputSampleRate, m_parameters);