view widgets/UnitConverter.cpp @ 1127:9fb8dfd7ce4c 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 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.
*/

#include "UnitConverter.h"

#include <QSpinBox>
#include <QComboBox>
#include <QDoubleSpinBox>
#include <QLabel>
#include <QDialogButtonBox>
#include <QGridLayout>
#include <QTabWidget>

#include "base/Debug.h"
#include "base/Pitch.h"
#include "base/Preferences.h"

using namespace std;

static QString pianoNotes[] = {
    "C", "C# / Db", "D", "D# / Eb", "E",
    "F", "F# / Gb", "G", "G# / Ab", "A", "A# / Bb", "B"
};

UnitConverter::UnitConverter(QWidget *parent) :
    QDialog(parent)
{
    QGridLayout *maingrid = new QGridLayout;
    setLayout(maingrid);
    
    QTabWidget *tabs = new QTabWidget;
    maingrid->addWidget(tabs, 0, 0);
    
    QDialogButtonBox *bb = new QDialogButtonBox(QDialogButtonBox::Close);
    maingrid->addWidget(bb, 1, 0);
    connect(bb, SIGNAL(rejected()), this, SLOT(close()));
    
    QFrame *frame = new QFrame;
    tabs->addTab(frame, tr("Pitch"));
    
    QGridLayout *grid = new QGridLayout;
    frame->setLayout(grid);

    m_freq = new QDoubleSpinBox;
    m_freq->setSuffix(QString(" Hz"));
    m_freq->setDecimals(6);
    m_freq->setMinimum(1e-3);
    m_freq->setMaximum(1e6);
    m_freq->setValue(440);
    connect(m_freq, SIGNAL(valueChanged(double)),
	    this, SLOT(freqChanged()));

    // The min and max range values for all the remaining controls are
    // determined by the min and max Hz above
    
    m_midi = new QSpinBox;
    m_midi->setMinimum(-156);
    m_midi->setMaximum(203);
    connect(m_midi, SIGNAL(valueChanged(int)),
	    this, SLOT(midiChanged()));

    m_note = new QComboBox;
    for (int i = 0; i < 12; ++i) {
	m_note->addItem(pianoNotes[i]);
    }
    connect(m_note, SIGNAL(currentIndexChanged(int)),
	    this, SLOT(noteChanged()));

    m_octave = new QSpinBox;
    m_octave->setMinimum(-14);
    m_octave->setMaximum(15);
    connect(m_octave, SIGNAL(valueChanged(int)),
	    this, SLOT(octaveChanged()));

    m_cents = new QDoubleSpinBox;
    m_cents->setSuffix(tr(" cents"));
    m_cents->setDecimals(4);
    m_cents->setMinimum(-50);
    m_cents->setMaximum(50);
    connect(m_cents, SIGNAL(valueChanged(double)),
	    this, SLOT(centsChanged()));
    
    int row = 0;

    grid->addWidget(new QLabel(tr("In 12-tone Equal Temperament:")), row, 0, 1, 9);

    ++row;
    
    grid->setRowMinimumHeight(row, 8);

    ++row;
    
    grid->addWidget(m_freq, row, 0, 2, 1, Qt::AlignRight | Qt::AlignVCenter);
    grid->addWidget(new QLabel(tr("=")), row, 1, 2, 1, Qt::AlignHCenter | Qt::AlignVCenter);

    grid->addWidget(new QLabel(tr("+")), row, 7, 2, 1, Qt::AlignHCenter | Qt::AlignVCenter);
    grid->addWidget(m_cents, row, 8, 2, 1, Qt::AlignLeft | Qt::AlignVCenter);

    grid->addWidget(new QLabel(tr("Piano note")), row, 2, 1, 2);
    grid->addWidget(m_note, row, 4);
    grid->addWidget(new QLabel(tr("in octave")), row, 5);
    grid->addWidget(m_octave, row, 6);

    ++row;
    
    grid->addWidget(new QLabel(tr("MIDI pitch")), row, 2, 1, 2);
    grid->addWidget(m_midi, row, 4);
    
    ++row;

    grid->setRowStretch(row, 20);
    grid->setRowMinimumHeight(row, 8);

    ++row;

    m_pitchPrefsLabel = new QLabel;
    grid->addWidget(m_pitchPrefsLabel, row, 0, 1, 9);

    ++row;
    
    grid->addWidget
	(new QLabel(tr("Note that only pitches in the range 0 to 127 are valid "
		       "in the MIDI protocol.")),
	 row, 0, 1, 9);

    ++row;
    
    frame = new QFrame;
    tabs->addTab(frame, tr("Tempo"));
    
    grid = new QGridLayout;
    frame->setLayout(grid);

    m_samples = new QDoubleSpinBox;
    m_samples->setSuffix(QString(" samples"));
    m_samples->setDecimals(2);
    m_samples->setMinimum(1);
    m_samples->setMaximum(1e8);
    m_samples->setValue(22050);
    connect(m_samples, SIGNAL(valueChanged(double)),
	    this, SLOT(samplesChanged()));
    
    m_period = new QDoubleSpinBox;
    m_period->setSuffix(QString(" ms"));
    m_period->setDecimals(4);
    m_period->setMinimum(1e-3);
    m_period->setMaximum(100000);
    m_period->setValue(500);
    connect(m_period, SIGNAL(valueChanged(double)),
	    this, SLOT(periodChanged()));

    m_bpm = new QDoubleSpinBox;
    m_bpm->setSuffix(QString(" bpm"));
    m_bpm->setDecimals(4);
    m_bpm->setMinimum(0.1);
    m_bpm->setMaximum(1e6);
    m_bpm->setValue(120);
    connect(m_bpm, SIGNAL(valueChanged(double)),
	    this, SLOT(bpmChanged()));

    m_tempofreq = new QDoubleSpinBox;
    m_tempofreq->setSuffix(QString(" beats/sec"));
    m_tempofreq->setDecimals(4);
    m_tempofreq->setMinimum(1e-3);
    m_tempofreq->setMaximum(1e5);
    m_tempofreq->setValue(0.5);

    connect(m_tempofreq, SIGNAL(valueChanged(double)),
	    this, SLOT(tempofreqChanged()));
	
    m_samplerate = new QComboBox;
    QList<int> rates;
    rates << 8000;
    for (int i = 1; i <= 16; i *= 2) {
	rates << 11025 * i << 12000 * i;
    }
    foreach (int r, rates) {
	m_samplerate->addItem(QString("%1 Hz").arg(r));
    }
    connect(m_samplerate, SIGNAL(currentIndexChanged(int)),
	    this, SLOT(samplerateChanged()));
    m_samplerate->setCurrentText("44100 Hz");
    
    connect(Preferences::getInstance(),
	    SIGNAL(propertyChanged(PropertyContainer::PropertyName)),
	    this, SLOT(preferenceChanged(PropertyContainer::PropertyName)));

    row = 0;

    grid->setRowStretch(row, 20);
    grid->setRowMinimumHeight(row, 8);

    ++row;

    grid->addWidget(new QLabel(tr("Beat period")), row, 0, 2, 1, Qt::AlignVCenter);
    grid->addWidget(m_period, row, 1);
    grid->addWidget(new QLabel(tr("=")), row, 2, 2, 1, Qt::AlignVCenter);

    grid->addWidget(m_tempofreq, row, 3);

    grid->addWidget(new QLabel(tr("at")), row, 4, 2, 1, Qt::AlignVCenter);
    grid->addWidget(m_samplerate, row, 5, 2, 1, Qt::AlignVCenter);

    ++row;
    
    grid->addWidget(m_samples, row, 1);
    grid->addWidget(m_bpm, row, 3);

    ++row;
    
    grid->setRowStretch(row, 20);
    grid->setRowMinimumHeight(row, 8);
    
    updatePitchesFromFreq();
    updatePitchPrefsLabel();
    updateTempiFromSamples();
}

UnitConverter::~UnitConverter()
{
}

void
UnitConverter::setTo(QSpinBox *box, int value)
{
    box->blockSignals(true);
    if (value < box->minimum() || value > box->maximum()) {
	QPalette p;
	p.setColor(QPalette::Text, Qt::red);
	box->setPalette(p);
    } else {
	box->setPalette(QPalette());
    }
    box->setValue(value);
    box->blockSignals(false);
}

void
UnitConverter::setTo(QDoubleSpinBox *box, double value)
{
    box->blockSignals(true);
    if (value < box->minimum() || value > box->maximum()) {
	QPalette p;
	p.setColor(QPalette::Text, Qt::red);
	box->setPalette(p);
    } else {
	box->setPalette(QPalette());
    }
    box->setValue(value);
    box->blockSignals(false);
}

void
UnitConverter::preferenceChanged(PropertyContainer::PropertyName)
{
    updatePitchesFromFreq();
    updatePitchPrefsLabel();
}

void
UnitConverter::updatePitchPrefsLabel()
{
    m_pitchPrefsLabel->setText
	(tr("With concert-A tuning frequency at %1 Hz, and "
	    "middle C residing in octave %2.\n"
	    "(These can be changed in the application preferences.)")
	 .arg(Preferences::getInstance()->getTuningFrequency())
	 .arg(Preferences::getInstance()->getOctaveOfMiddleC()));
}

void
UnitConverter::freqChanged()
{
    updatePitchesFromFreq();
}

void
UnitConverter::midiChanged()
{
    double freq = Pitch::getFrequencyForPitch(m_midi->value(), m_cents->value());
    m_freq->setValue(freq);
}

void
UnitConverter::noteChanged()
{
    int pitch = Pitch::getPitchForNoteAndOctave(m_note->currentIndex(),
						m_octave->value());
    double freq = Pitch::getFrequencyForPitch(pitch, m_cents->value());
    m_freq->setValue(freq);
}

void
UnitConverter::octaveChanged()
{
    int pitch = Pitch::getPitchForNoteAndOctave(m_note->currentIndex(),
						m_octave->value());
    double freq = Pitch::getFrequencyForPitch(pitch, m_cents->value());
    m_freq->setValue(freq);
}

void
UnitConverter::centsChanged()
{
    double freq = Pitch::getFrequencyForPitch(m_midi->value(), m_cents->value());
    m_freq->setValue(freq);
}

void
UnitConverter::updatePitchesFromFreq()
{
    double cents = 0;
    int pitch = Pitch::getPitchForFrequency(m_freq->value(), &cents);
    int note, octave;
    Pitch::getNoteAndOctaveForPitch(pitch, note, octave);

    cerr << "pitch " << pitch << " note " << note << " octave " << octave << " cents " << cents << endl;

    setTo(m_midi, pitch);
    setTo(m_cents, cents);
    setTo(m_octave, octave);

    m_note->blockSignals(true);
    m_note->setCurrentIndex(note);
    m_note->blockSignals(false);
}

void
UnitConverter::samplesChanged()
{
    updateTempiFromSamples();
}

void
UnitConverter::periodChanged()
{
    double rate = getSampleRate();
    double sec = m_period->value() / 1000.0;
    double samples = rate * sec;
    m_samples->setValue(samples);
}

void
UnitConverter::bpmChanged()
{
    double rate = getSampleRate();
    double sec = 60.0 / m_bpm->value();
    double samples = rate * sec;
    m_samples->setValue(samples);
}

void
UnitConverter::tempofreqChanged()
{
    double rate = getSampleRate();
    double samples = rate / m_tempofreq->value();
    m_samples->setValue(samples);
}

void
UnitConverter::samplerateChanged()
{
    // Preserve the beat period in seconds, here, not in samples
    periodChanged();
}

double
UnitConverter::getSampleRate()
{
    return double(atoi(m_samplerate->currentText().toLocal8Bit().data()));
}

void
UnitConverter::updateTempiFromSamples()
{
    double samples = m_samples->value();
    double rate = getSampleRate();

    cerr << samples << " samples at rate " << rate << endl;

    double sec = samples / rate;
    double hz = rate / samples;
    double bpm = 60.0 / sec;

    setTo(m_bpm, bpm);
    setTo(m_period, sec * 1000.0);
    setTo(m_tempofreq, hz);
}