view data/model/Labeller.h @ 1196:c7b9c902642f spectrogram-minor-refactor

Fix threshold in spectrogram -- it wasn't working in the last release.
There is a new protocol for this. Formerly the threshold parameter had a
range from -50dB to 0 with the default at -50, and -50 treated internally
as "no threshold". However, there was a hardcoded, hidden internal threshold
for spectrogram colour mapping at -80dB with anything below this being rounded
to zero. Now the threshold parameter has range -81 to -1 with the default
at -80, -81 is treated internally as "no threshold", and there is no hidden
internal threshold. So the default behaviour is the same as before, an
effective -80dB threshold, but it is now possible to change this in both
directions. Sessions reloaded from prior versions may look slightly different
because, if the session says there should be no threshold, there will now
actually be no threshold instead of having the hidden internal one.

Still need to do something in the UI to make it apparent that the -81dB
setting removes the threshold entirely. This is at least no worse than the
previous, also obscured, magic -50dB setting.

/* -*- 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 2006-2007 Chris Cannam and QMUL.
    
    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 _LABELLER_H_
#define _LABELLER_H_

#include "SparseModel.h"
#include "SparseValueModel.h"

#include "base/Selection.h"

#include <QObject>

#include <map>
#include <iostream>

class Labeller : public QObject
{
    Q_OBJECT

public:
    enum ValueType {
        ValueNone,
        ValueFromSimpleCounter,
        ValueFromCyclicalCounter,
        ValueFromTwoLevelCounter,
        ValueFromFrameNumber,
        ValueFromRealTime,
        ValueFromDurationFromPrevious,
        ValueFromDurationToNext,
        ValueFromTempoFromPrevious,
        ValueFromTempoToNext,
        ValueFromExistingNeighbour,
        ValueFromLabel
    };

    // uses:
    //
    // 1. when adding points to a time-value model, generate values
    // for those points based on their times or labels or a counter
    //
    // 2. when adding a single point to a time-instant model, generate
    // a label for it based on its time and that of the previous point
    // or a counter
    //
    // 3. when adding a single point to a time-instant model, generate
    // a label for the previous point based on its time and that of
    // the point just added (as tempo is based on time to the next
    // point, not the previous one)
    //
    // 4. re-label a set of points that have already been added to a
    // model

    Labeller(ValueType type = ValueNone) :
        m_type(type),
        m_counter(1),
        m_counter2(1),
        m_cycle(4),
        m_dp(10),
        m_rate(0) { }

    Labeller(const Labeller &l) :
        QObject(),
        m_type(l.m_type),
        m_counter(l.m_counter),
        m_counter2(l.m_counter2),
        m_cycle(l.m_cycle),
        m_dp(l.m_dp),
        m_rate(l.m_rate) { }

    virtual ~Labeller() { }

    typedef std::map<ValueType, QString> TypeNameMap;
    TypeNameMap getTypeNames() const {
        TypeNameMap m;
        m[ValueNone]
            = tr("No numbering");
        m[ValueFromSimpleCounter]
            = tr("Simple counter");
        m[ValueFromCyclicalCounter]
            = tr("Cyclical counter");
        m[ValueFromTwoLevelCounter]
            = tr("Cyclical two-level counter (bar/beat)");
        m[ValueFromFrameNumber]
            = tr("Audio sample frame number");
        m[ValueFromRealTime]
            = tr("Time in seconds");
        m[ValueFromDurationToNext]
            = tr("Duration to the following item");
        m[ValueFromTempoToNext]
            = tr("Tempo (bpm) based on duration to following item");
        m[ValueFromDurationFromPrevious]
            = tr("Duration since the previous item");
        m[ValueFromTempoFromPrevious]
            = tr("Tempo (bpm) based on duration since previous item");
        m[ValueFromExistingNeighbour]
            = tr("Same as the nearest previous item");
        m[ValueFromLabel]
            = tr("Value extracted from the item's label (where possible)");
        return m;
    }

    ValueType getType() const { return m_type; }
    void setType(ValueType type) { m_type = type; }

    int getCounterValue() const { return m_counter; }
    void setCounterValue(int v) { m_counter = v; }

    int getSecondLevelCounterValue() const { return m_counter2; }
    void setSecondLevelCounterValue(int v) { m_counter2 = v; }

    int getCounterCycleSize() const { return m_cycle; }
    void setCounterCycleSize(int s) {
        m_cycle = s;
        m_dp = 1;
        while (s > 0) {
            s /= 10;
            m_dp *= 10;
        }
        if (m_counter > m_cycle) m_counter = 1;
    }

    void setSampleRate(sv_samplerate_t rate) { m_rate = rate; }

    void resetCounters() {
        m_counter = 1;
        m_counter2 = 1;
        m_cycle = 4;
    }

    void incrementCounter() {
        m_counter++;
        if (m_type == ValueFromCyclicalCounter ||
            m_type == ValueFromTwoLevelCounter) {
            if (m_counter > m_cycle) {
                m_counter = 1;
                m_counter2++;
            }
        }
    }

    template <typename PointType>
    void label(PointType &newPoint, PointType *prevPoint = 0) {
        if (m_type == ValueNone) {
            newPoint.label = "";
        } else if (m_type == ValueFromTwoLevelCounter) {
            newPoint.label = tr("%1.%2").arg(m_counter2).arg(m_counter);
            incrementCounter();
        } else if (m_type == ValueFromFrameNumber) {
            // avoid going through floating-point value
            newPoint.label = tr("%1").arg(newPoint.frame);
        } else {
            float value = getValueFor<PointType>(newPoint, prevPoint);
            if (actingOnPrevPoint() && prevPoint) {
                prevPoint->label = QString("%1").arg(value);
            } else {
                newPoint.label = QString("%1").arg(value);
            }
        }
    }
        
    template <typename PointType>
    void labelAll(SparseModel<PointType> &model, MultiSelection *ms) {

        typename SparseModel<PointType>::PointList::iterator i;
        typename SparseModel<PointType>::PointList pl(model.getPoints());

        typename SparseModel<PointType>::EditCommand *command =
            new typename SparseModel<PointType>::EditCommand
            (&model, tr("Label Points"));

        PointType prevPoint(0);

        for (i = pl.begin(); i != pl.end(); ++i) {

            bool inRange = true;
            if (ms) {
                Selection s(ms->getContainingSelection(i->frame, false));
                if (s.isEmpty() || !s.contains(i->frame)) {
                    inRange = false;
                }
            }

            PointType p(*i);

            if (!inRange) {
                prevPoint = p;
                continue;
            }

            if (actingOnPrevPoint()) {
                if (i != pl.begin()) {
                    command->deletePoint(prevPoint);
                    label<PointType>(p, &prevPoint);
                    command->addPoint(prevPoint);
                }
            } else {
                command->deletePoint(p);
                label<PointType>(p, &prevPoint);
                command->addPoint(p);
            }

            prevPoint = p;
        }

        command->finish();
    }

    template <typename PointType>
    void setValue(PointType &newPoint, PointType *prevPoint = 0) {
        if (m_type == ValueFromExistingNeighbour) {
            if (!prevPoint) {
                std::cerr << "ERROR: Labeller::setValue: Previous point required but not provided" << std::endl;
            } else {
                newPoint.value = prevPoint->value;
            }
        } else {
            float value = getValueFor<PointType>(newPoint, prevPoint);
            if (actingOnPrevPoint() && prevPoint) {
                prevPoint->value = value;
            } else {
                newPoint.value = value;
            }
        }
    }

    bool requiresPrevPoint() const {
        return (m_type == ValueFromDurationFromPrevious ||
                m_type == ValueFromDurationToNext ||
                m_type == ValueFromTempoFromPrevious ||
                m_type == ValueFromDurationToNext);
    }

    bool actingOnPrevPoint() const {
        return (m_type == ValueFromDurationToNext ||
                m_type == ValueFromTempoToNext);
    }

protected:
    template <typename PointType>
    float getValueFor(PointType &newPoint, PointType *prevPoint)
    {
        float value = 0.f;

        switch (m_type) {

        case ValueNone:
            value = 0;
            break;

        case ValueFromSimpleCounter:
        case ValueFromCyclicalCounter:
            value = float(m_counter);
            incrementCounter();
            break;

        case ValueFromTwoLevelCounter:
            value = float(m_counter2 + double(m_counter) / double(m_dp));
            incrementCounter();
            break;

        case ValueFromFrameNumber:
            value = float(newPoint.frame);
            break;
            
        case ValueFromRealTime: 
            if (m_rate == 0.0) {
                std::cerr << "ERROR: Labeller::getValueFor: Real-time conversion required, but no sample rate set" << std::endl;
            } else {
                value = float(double(newPoint.frame) / m_rate);
            }
            break;

        case ValueFromDurationToNext:
        case ValueFromTempoToNext:
        case ValueFromDurationFromPrevious:
        case ValueFromTempoFromPrevious:
            if (m_rate == 0.0) {
                std::cerr << "ERROR: Labeller::getValueFor: Real-time conversion required, but no sample rate set" << std::endl;
            } else if (!prevPoint) {
                std::cerr << "ERROR: Labeller::getValueFor: Time difference required, but only one point provided" << std::endl;
            } else {
                sv_frame_t f0 = prevPoint->frame, f1 = newPoint.frame;
                if (m_type == ValueFromDurationToNext ||
                    m_type == ValueFromDurationFromPrevious) {
                    value = float(double(f1 - f0) / m_rate);
                } else {
                    if (f1 > f0) {
                        value = float((60.0 * m_rate) / double(f1 - f0));
                    }
                }
            }
            break;

        case ValueFromExistingNeighbour:
            // need to deal with this in the calling function, as this
            // function must handle points that don't have values to
            // read from
            break;

        case ValueFromLabel:
            if (newPoint.label != "") {
                // more forgiving than QString::toFloat()
                value = float(atof(newPoint.label.toLocal8Bit()));
            } else {
                value = 0.f;
            }
            break;
        }

        return value;
    }

    ValueType m_type;
    int m_counter;
    int m_counter2;
    int m_cycle;
    int m_dp;
    sv_samplerate_t m_rate;
};

#endif