view data/model/Labeller.h @ 1310:aa1b1fc2d018 mp3-gapless

Stop reporting sync errors only when we really are at eof, i.e. after the input callback has been called again (previously we just tested whether we'd buffered up all the input, which of course we do in one go at the start)

/* -*- 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);
            }
        }
    }
        
    /**
     * Relabel all points in the given model that lie within the given
     * multi-selection, according to the labelling properties of this
     * labeller.  Return a command that has been executed but not yet
     * added to the history.
     */
    template <typename PointType>
    Command *labelAll(SparseModel<PointType> &model, MultiSelection *ms) {

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

        PointType prevPoint(0);
        bool havePrevPoint(false);

        for (auto p: points) {

            if (ms) {
                Selection s(ms->getContainingSelection(p.frame, false));
                if (!s.contains(p.frame)) {
                    prevPoint = p;
                    havePrevPoint = true;
                    continue;
                }
            }

            if (actingOnPrevPoint()) {
                if (havePrevPoint) {
                    command->deletePoint(prevPoint);
                    label<PointType>(p, &prevPoint);
                    command->addPoint(prevPoint);
                }
            } else {
                command->deletePoint(p);
                label<PointType>(p, &prevPoint);
                command->addPoint(p);
            }

            prevPoint = p;
            havePrevPoint = true;
        }

        return command->finish();
    }

    /**
     * For each point in the given model (except the last), if that
     * point lies within the given multi-selection, add n-1 new points
     * at equally spaced intervals between it and the following point.
     * Return a command that has been executed but not yet added to
     * the history.
     */
    template <typename PointType>
    Command *subdivide(SparseModel<PointType> &model, MultiSelection *ms, int n) {
        
        auto points(model.getPoints());
        auto command = new typename SparseModel<PointType>::EditCommand
            (&model, tr("Subdivide Points"));

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

            auto j = i;
            // require a "next point" even if it's not in selection
            if (++j == points.end()) {
                break;
            }

            if (ms) {
                Selection s(ms->getContainingSelection(i->frame, false));
                if (!s.contains(i->frame)) {
                    continue;
                }
            }

            PointType p(*i);
            PointType nextP(*j);

            // n is the number of subdivisions, so we add n-1 new
            // points equally spaced between p and nextP

            for (int m = 1; m < n; ++m) {
                sv_frame_t f = p.frame + (m * (nextP.frame - p.frame)) / n;
                PointType newPoint(p);
                newPoint.frame = f;
                newPoint.label = tr("%1.%2").arg(p.label).arg(m+1);
                command->addPoint(newPoint);
            }
        }

        return command->finish();
    }

    /**
     * Return a command that has been executed but not yet added to
     * the history.
     */
    template <typename PointType>
    Command *winnow(SparseModel<PointType> &model, MultiSelection *ms, int n) {
        
        auto points(model.getPoints());
        auto command = new typename SparseModel<PointType>::EditCommand
            (&model, tr("Winnow Points"));

        int counter = 0;
        
        for (auto p: points) {

            if (ms) {
                Selection s(ms->getContainingSelection(p.frame, false));
                if (!s.contains(p.frame)) {
                    counter = 0;
                    continue;
                }
            }

            ++counter;

            if (counter == n+1) counter = 1;
            if (counter == 1) {
                // this is an Nth instant, don't remove it
                continue;
            }
            
            command->deletePoint(p);
        }

        return 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