view layer/SpectrogramLayer.cpp @ 11:2d5005f2b3d9

* Rework handling of layer properties in file I/O -- we now get the individual
  layers to load and save them rather than doing it via generic property lists
  in the base class, so as to ensure we read and write meaningful values rather
  than generic int values requiring conversion.

/* -*- c-basic-offset: 4 -*-  vi:set ts=8 sts=4 sw=4: */

/*
    A waveform viewer and audio annotation editor.
    Chris Cannam, Queen Mary University of London, 2005-2006
    
    This is experimental software.  Not for distribution.
*/

#include "SpectrogramLayer.h"

#include "base/View.h"
#include "base/Profiler.h"
#include "base/AudioLevel.h"
#include "base/Window.h"

#include <QPainter>
#include <QImage>
#include <QPixmap>
#include <QRect>
#include <QTimer>

#include <iostream>

#include <cassert>
#include <cmath>

//#define DEBUG_SPECTROGRAM_REPAINT 1


SpectrogramLayer::SpectrogramLayer(View *w, Configuration config) :
    Layer(w),
    m_model(0),
    m_channel(0),
    m_windowSize(1024),
    m_windowType(HanningWindow),
    m_windowOverlap(50),
    m_gain(1.0),
    m_colourRotation(0),
    m_maxFrequency(8000),
    m_colourScale(dBColourScale),
    m_colourScheme(DefaultColours),
    m_frequencyScale(LinearFrequencyScale),
    m_cache(0),
    m_cacheInvalid(true),
    m_pixmapCache(0),
    m_pixmapCacheInvalid(true),
    m_fillThread(0),
    m_updateTimer(0),
    m_lastFillExtent(0),
    m_exiting(false)
{
    if (config == MelodicRange) {
	setWindowSize(8192);
	setWindowOverlap(90);
	setWindowType(ParzenWindow);
	setMaxFrequency(1000);
	setColourScale(LinearColourScale);
    }

    if (m_view) m_view->setLightBackground(false);
    m_view->addLayer(this);
}

SpectrogramLayer::~SpectrogramLayer()
{
    delete m_updateTimer;
    m_updateTimer = 0;

    m_exiting = true;
    m_condition.wakeAll();
    if (m_fillThread) m_fillThread->wait();
    delete m_fillThread;
    
    delete m_cache;
}

void
SpectrogramLayer::setModel(const DenseTimeValueModel *model)
{
    m_mutex.lock();
    m_model = model;
    m_mutex.unlock();

    if (!m_model || !m_model->isOK()) return;

    connect(m_model, SIGNAL(modelChanged()), this, SIGNAL(modelChanged()));
    connect(m_model, SIGNAL(modelChanged(size_t, size_t)),
	    this, SIGNAL(modelChanged(size_t, size_t)));

    connect(m_model, SIGNAL(completionChanged()),
	    this, SIGNAL(modelCompletionChanged()));

    connect(m_model, SIGNAL(modelChanged()), this, SLOT(cacheInvalid()));
    connect(m_model, SIGNAL(modelChanged(size_t, size_t)),
	    this, SLOT(cacheInvalid(size_t, size_t)));

    emit modelReplaced();
    fillCache();
}

Layer::PropertyList
SpectrogramLayer::getProperties() const
{
    PropertyList list;
    list.push_back(tr("Colour"));
    list.push_back(tr("Colour Scale"));
    list.push_back(tr("Window Type"));
    list.push_back(tr("Window Size"));
    list.push_back(tr("Window Overlap"));
    list.push_back(tr("Gain"));
    list.push_back(tr("Colour Rotation"));
    list.push_back(tr("Max Frequency"));
    list.push_back(tr("Frequency Scale"));
    return list;
}

Layer::PropertyType
SpectrogramLayer::getPropertyType(const PropertyName &name) const
{
    if (name == tr("Gain")) return RangeProperty;
    if (name == tr("Colour Rotation")) return RangeProperty;
    return ValueProperty;
}

QString
SpectrogramLayer::getPropertyGroupName(const PropertyName &name) const
{
    if (name == tr("Window Size") ||
	name == tr("Window Overlap")) return tr("Window");
    if (name == tr("Gain") ||
	name == tr("Colour Rotation") ||
	name == tr("Colour Scale")) return tr("Scale");
    if (name == tr("Max Frequency") ||
	name == tr("Frequency Scale")) return tr("Frequency");
    return QString();
}

int
SpectrogramLayer::getPropertyRangeAndValue(const PropertyName &name,
					    int *min, int *max) const
{
    int deft = 0;

    int throwaway;
    if (!min) min = &throwaway;
    if (!max) max = &throwaway;

    if (name == tr("Gain")) {

	*min = -50;
	*max = 50;

	deft = lrint(log10(m_gain) * 20.0);
	if (deft < *min) deft = *min;
	if (deft > *max) deft = *max;

    } else if (name == tr("Colour Rotation")) {

	*min = 0;
	*max = 256;

	deft = m_colourRotation;

    } else if (name == tr("Colour Scale")) {

	*min = 0;
	*max = 3;

	deft = (int)m_colourScale;

    } else if (name == tr("Colour")) {

	*min = 0;
	*max = 5;

	deft = (int)m_colourScheme;

    } else if (name == tr("Window Type")) {

	*min = 0;
	*max = 6;

	deft = (int)m_windowType;

    } else if (name == tr("Window Size")) {

	*min = 0;
	*max = 10;
	
	deft = 0;
	int ws = m_windowSize;
	while (ws > 32) { ws >>= 1; deft ++; }

    } else if (name == tr("Window Overlap")) {
	
	*min = 0;
	*max = 4;
	
	deft = m_windowOverlap / 25;
	if (m_windowOverlap == 90) deft = 4;
    
    } else if (name == tr("Max Frequency")) {

	*min = 0;
	*max = 9;

	switch (m_maxFrequency) {
	case 500: deft = 0; break;
	case 1000: deft = 1; break;
	case 1500: deft = 2; break;
	case 2000: deft = 3; break;
	case 4000: deft = 4; break;
	case 6000: deft = 5; break;
	case 8000: deft = 6; break;
	case 12000: deft = 7; break;
	case 16000: deft = 8; break;
	default: deft = 9; break;
	}

    } else if (name == tr("Frequency Scale")) {

	*min = 0;
	*max = 1;
	deft = (int)m_frequencyScale;

    } else {
	deft = Layer::getPropertyRangeAndValue(name, min, max);
    }

    return deft;
}

QString
SpectrogramLayer::getPropertyValueLabel(const PropertyName &name,
					int value) const
{
    if (name == tr("Colour")) {
	switch (value) {
	default:
	case 0: return tr("Default");
	case 1: return tr("White on Black");
	case 2: return tr("Black on White");
	case 3: return tr("Red on Blue");
	case 4: return tr("Yellow on Black");
	case 5: return tr("Red on Black");
	}
    }
    if (name == tr("Colour Scale")) {
	switch (value) {
	default:
	case 0: return tr("Level Linear");
	case 1: return tr("Level Meter");
	case 2: return tr("Level dB");
	case 3: return tr("Phase");
	}
    }
    if (name == tr("Window Type")) {
	switch ((WindowType)value) {
	default:
	case RectangularWindow: return tr("Rectangular");
	case BartlettWindow: return tr("Bartlett");
	case HammingWindow: return tr("Hamming");
	case HanningWindow: return tr("Hanning");
	case BlackmanWindow: return tr("Blackman");
	case GaussianWindow: return tr("Gaussian");
	case ParzenWindow: return tr("Parzen");
	}
    }
    if (name == tr("Window Size")) {
	return QString("%1").arg(32 << value);
    }
    if (name == tr("Window Overlap")) {
	switch (value) {
	default:
	case 0: return tr("None");
	case 1: return tr("25 %");
	case 2: return tr("50 %");
	case 3: return tr("75 %");
	case 4: return tr("90 %");
	}
    }
    if (name == tr("Max Frequency")) {
	switch (value) {
	default:
	case 0: return tr("500 Hz");
	case 1: return tr("1 KHz");
	case 2: return tr("1.5 KHz");
	case 3: return tr("2 KHz");
	case 4: return tr("4 KHz");
	case 5: return tr("6 KHz");
	case 6: return tr("8 KHz");
	case 7: return tr("12 KHz");
	case 8: return tr("16 KHz");
	case 9: return tr("All");
	}
    }
    if (name == tr("Frequency Scale")) {
	switch (value) {
	default:
	case 0: return tr("Linear");
	case 1: return tr("Log");
	}
    }
    return tr("<unknown>");
}

void
SpectrogramLayer::setProperty(const PropertyName &name, int value)
{
    if (name == tr("Gain")) {
	setGain(pow(10, float(value)/20.0));
    } else if (name == tr("Colour Rotation")) {
	setColourRotation(value);
    } else if (name == tr("Colour")) {
	if (m_view) m_view->setLightBackground(value == 2);
	switch (value) {
	default:
	case 0:	setColourScheme(DefaultColours); break;
	case 1: setColourScheme(WhiteOnBlack); break;
	case 2: setColourScheme(BlackOnWhite); break;
	case 3: setColourScheme(RedOnBlue); break;
	case 4: setColourScheme(YellowOnBlack); break;
	case 5: setColourScheme(RedOnBlack); break;
	}
    } else if (name == tr("Window Type")) {
	setWindowType(WindowType(value));
    } else if (name == tr("Window Size")) {
	setWindowSize(32 << value);
    } else if (name == tr("Window Overlap")) {
	if (value == 4) setWindowOverlap(90);
	else setWindowOverlap(25 * value);
    } else if (name == tr("Max Frequency")) {
	switch (value) {
	case 0: setMaxFrequency(500); break;
	case 1: setMaxFrequency(1000); break;
	case 2: setMaxFrequency(1500); break;
	case 3: setMaxFrequency(2000); break;
	case 4: setMaxFrequency(4000); break;
	case 5: setMaxFrequency(6000); break;
	case 6: setMaxFrequency(8000); break;
	case 7: setMaxFrequency(12000); break;
	case 8: setMaxFrequency(16000); break;
	default:
	case 9: setMaxFrequency(0); break;
	}
    } else if (name == tr("Colour Scale")) {
	switch (value) {
	default:
	case 0: setColourScale(LinearColourScale); break;
	case 1: setColourScale(MeterColourScale); break;
	case 2: setColourScale(dBColourScale); break;
	case 3: setColourScale(PhaseColourScale); break;
	}
    } else if (name == tr("Frequency Scale")) {
	switch (value) {
	default:
	case 0: setFrequencyScale(LinearFrequencyScale); break;
	case 1: setFrequencyScale(LogFrequencyScale); break;
	}
    }
}

void
SpectrogramLayer::setChannel(int ch)
{
    if (m_channel == ch) return;

    m_mutex.lock();
    m_cacheInvalid = true;
    m_pixmapCacheInvalid = true;
    
    m_channel = ch;

    m_mutex.unlock();

    emit layerParametersChanged();

    fillCache();
}

int
SpectrogramLayer::getChannel() const
{
    return m_channel;
}

void
SpectrogramLayer::setWindowSize(size_t ws)
{
    if (m_windowSize == ws) return;

    m_mutex.lock();
    m_cacheInvalid = true;
    m_pixmapCacheInvalid = true;
    
    m_windowSize = ws;
    
    m_mutex.unlock();

    emit layerParametersChanged();

    fillCache();
}

size_t
SpectrogramLayer::getWindowSize() const
{
    return m_windowSize;
}

void
SpectrogramLayer::setWindowOverlap(size_t wi)
{
    if (m_windowOverlap == wi) return;

    m_mutex.lock();
    m_cacheInvalid = true;
    m_pixmapCacheInvalid = true;
    
    m_windowOverlap = wi;
    
    m_mutex.unlock();

    emit layerParametersChanged();

    fillCache();
}

size_t
SpectrogramLayer::getWindowOverlap() const
{
    return m_windowOverlap;
}

void
SpectrogramLayer::setWindowType(WindowType w)
{
    if (m_windowType == w) return;

    m_mutex.lock();
    m_cacheInvalid = true;
    m_pixmapCacheInvalid = true;
    
    m_windowType = w;
    
    m_mutex.unlock();

    emit layerParametersChanged();

    fillCache();
}

WindowType
SpectrogramLayer::getWindowType() const
{
    return m_windowType;
}

void
SpectrogramLayer::setGain(float gain)
{
    if (m_gain == gain) return; //!!! inadequate for floats!

    m_mutex.lock();
    m_cacheInvalid = true;
    m_pixmapCacheInvalid = true;
    
    m_gain = gain;
    
    m_mutex.unlock();

    emit layerParametersChanged();

    fillCache();
}

float
SpectrogramLayer::getGain() const
{
    return m_gain;
}

void
SpectrogramLayer::setMaxFrequency(size_t mf)
{
    if (m_maxFrequency == mf) return;

    m_mutex.lock();
    // don't need to invalidate main cache here
    m_pixmapCacheInvalid = true;
    
    m_maxFrequency = mf;
    
    m_mutex.unlock();

    emit layerParametersChanged();
}

size_t
SpectrogramLayer::getMaxFrequency() const
{
    return m_maxFrequency;
}

void
SpectrogramLayer::setColourRotation(int r)
{
    m_mutex.lock();
    // don't need to invalidate main cache here
    m_pixmapCacheInvalid = true;

    if (r < 0) r = 0;
    if (r > 256) r = 256;
    int distance = r - m_colourRotation;

    if (distance != 0) {
	rotateCacheColourmap(-distance);
	m_colourRotation = r;
    }
    
    m_mutex.unlock();

    emit layerParametersChanged();
}

void
SpectrogramLayer::setColourScale(ColourScale colourScale)
{
    if (m_colourScale == colourScale) return;

    m_mutex.lock();
    m_cacheInvalid = true;
    m_pixmapCacheInvalid = true;
    
    m_colourScale = colourScale;
    
    m_mutex.unlock();
    fillCache();

    emit layerParametersChanged();
}

SpectrogramLayer::ColourScale
SpectrogramLayer::getColourScale() const
{
    return m_colourScale;
}

void
SpectrogramLayer::setColourScheme(ColourScheme scheme)
{
    if (m_colourScheme == scheme) return;

    m_mutex.lock();
    // don't need to invalidate main cache here
    m_pixmapCacheInvalid = true;
    
    m_colourScheme = scheme;
    setCacheColourmap();

    m_mutex.unlock();

    emit layerParametersChanged();
}

SpectrogramLayer::ColourScheme
SpectrogramLayer::getColourScheme() const
{
    return m_colourScheme;
}

void
SpectrogramLayer::setFrequencyScale(FrequencyScale frequencyScale)
{
    if (m_frequencyScale == frequencyScale) return;

    m_mutex.lock();
    // don't need to invalidate main cache here
    m_pixmapCacheInvalid = true;
    
    m_frequencyScale = frequencyScale;
    
    m_mutex.unlock();

    emit layerParametersChanged();
}

SpectrogramLayer::FrequencyScale
SpectrogramLayer::getFrequencyScale() const
{
    return m_frequencyScale;
}

void
SpectrogramLayer::cacheInvalid()
{
    m_cacheInvalid = true;
    m_pixmapCacheInvalid = true;
    m_cachedInitialVisibleArea = false;
    fillCache();
}

void
SpectrogramLayer::cacheInvalid(size_t, size_t)
{
    // for now (or forever?)
    cacheInvalid();
}

void
SpectrogramLayer::fillCache()
{
#ifdef DEBUG_SPECTROGRAM_REPAINT
    std::cerr << "SpectrogramLayer::fillCache" << std::endl;
#endif
    QMutexLocker locker(&m_mutex);

    m_lastFillExtent = 0;

    delete m_updateTimer;
    m_updateTimer = new QTimer(this);
    connect(m_updateTimer, SIGNAL(timeout()), this, SLOT(fillTimerTimedOut()));
    m_updateTimer->start(200);

    if (!m_fillThread) {
	std::cerr << "SpectrogramLayer::fillCache creating thread" << std::endl;
	m_fillThread = new CacheFillThread(*this);
	m_fillThread->start();
    }

    m_condition.wakeAll();
}   

void
SpectrogramLayer::fillTimerTimedOut()
{
    if (m_fillThread && m_model) {
	size_t fillExtent = m_fillThread->getFillExtent();
#ifdef DEBUG_SPECTROGRAM_REPAINT
	std::cerr << "SpectrogramLayer::fillTimerTimedOut: extent " << fillExtent << ", last " << m_lastFillExtent << ", total " << m_model->getEndFrame() << std::endl;
#endif
	if (fillExtent >= m_lastFillExtent) {
	    if (fillExtent >= m_model->getEndFrame() && m_lastFillExtent > 0) {
#ifdef DEBUG_SPECTROGRAM_REPAINT
		std::cerr << "complete!" << std::endl;
#endif
		emit modelChanged();
		m_pixmapCacheInvalid = true;
		delete m_updateTimer;
		m_updateTimer = 0;
		m_lastFillExtent = 0;
	    } else if (fillExtent > m_lastFillExtent) {
#ifdef DEBUG_SPECTROGRAM_REPAINT
		std::cerr << "SpectrogramLayer: emitting modelChanged("
			  << m_lastFillExtent << "," << fillExtent << ")" << std::endl;
#endif
		emit modelChanged(m_lastFillExtent, fillExtent);
		m_pixmapCacheInvalid = true;
		m_lastFillExtent = fillExtent;
	    }
	} else {
	    if (m_view) {
		size_t sf = 0;
		if (m_view->getStartFrame() > 0) sf = m_view->getStartFrame();
#ifdef DEBUG_SPECTROGRAM_REPAINT
		std::cerr << "SpectrogramLayer: going backwards, emitting modelChanged("
			  << sf << "," << m_view->getEndFrame() << ")" << std::endl;
#endif
		emit modelChanged(sf, m_view->getEndFrame());
		m_pixmapCacheInvalid = true;
	    }
	    m_lastFillExtent = fillExtent;
	}
    }
}

void
SpectrogramLayer::setCacheColourmap()
{
    if (m_cacheInvalid || !m_cache) return;

    int formerRotation = m_colourRotation;

    m_cache->setNumColors(256);
    
    m_cache->setColor(0, qRgb(255, 255, 255));

    for (int pixel = 1; pixel < 256; ++pixel) {

	QColor colour;
	int hue, px;

	switch (m_colourScheme) {

	default:
	case DefaultColours:
	    hue = 256 - pixel;
	    colour = QColor::fromHsv(hue, pixel/2 + 128, pixel);
	    break;

	case WhiteOnBlack:
	    colour = QColor(pixel, pixel, pixel);
	    break;

	case BlackOnWhite:
	    colour = QColor(256-pixel, 256-pixel, 256-pixel);
	    break;

	case RedOnBlue:
	    colour = QColor(pixel > 128 ? (pixel - 128) * 2 : 0, 0,
			    pixel < 128 ? pixel : (256 - pixel));
	    break;

	case YellowOnBlack:
	    px = 256 - pixel;
	    colour = QColor(px < 64 ? 255 - px/2 :
			    px < 128 ? 224 - (px - 64) :
			    px < 192 ? 160 - (px - 128) * 3 / 2 :
			    256 - px,
			    pixel,
			    pixel / 4);
	    break;

	case RedOnBlack:
	    colour = QColor::fromHsv(10, pixel, pixel);
	    break;
	}

	m_cache->setColor
	    (pixel, qRgb(colour.red(), colour.green(), colour.blue()));
    }

    m_colourRotation = 0;
    rotateCacheColourmap(m_colourRotation - formerRotation);
    m_colourRotation = formerRotation;
}

void
SpectrogramLayer::rotateCacheColourmap(int distance)
{
    if (!m_cache) return;

    QRgb newPixels[256];

    newPixels[0] = m_cache->color(0);

    for (int pixel = 1; pixel < 256; ++pixel) {
	int target = pixel + distance;
	while (target < 1) target += 255;
	while (target > 255) target -= 255;
	newPixels[target] = m_cache->color(pixel);
    }

    for (int pixel = 0; pixel < 256; ++pixel) {
	m_cache->setColor(pixel, newPixels[pixel]);
    }
}

bool
SpectrogramLayer::fillCacheColumn(int column, double *input,
				  fftw_complex *output,
				  fftw_plan plan, 
				  size_t windowSize,
				  size_t increment,
				  const Window<double> &windower,
				  bool lock) const
{
    int startFrame = increment * column;
    int endFrame = startFrame + windowSize;

    startFrame -= int(windowSize - increment) / 2;
    endFrame   -= int(windowSize - increment) / 2;
    size_t pfx = 0;

    if (startFrame < 0) {
	pfx = size_t(-startFrame);
	for (size_t i = 0; i < pfx; ++i) {
	    input[i] = 0.0;
	}
    }

    size_t got = m_model->getValues(m_channel, startFrame + pfx,
				    endFrame, input + pfx);
    while (got + pfx < windowSize) {
	input[got + pfx] = 0.0;
	++got;
    }

    if (m_gain != 1.0) {
	for (size_t i = 0; i < windowSize; ++i) {
	    input[i] *= m_gain;
	}
    }

    windower.cut(input);

    fftw_execute(plan);

    if (lock) m_mutex.lock();
    bool interrupted = false;

    for (size_t i = 0; i < windowSize / 2; ++i) {

	int value = 0;

	if (m_colourScale == PhaseColourScale) {

	    double phase = atan2(-output[i][1], output[i][0]);
	    value = int((phase * 128 / M_PI) + 128);

	} else {

	    double mag = sqrt(output[i][0] * output[i][0] +
			      output[i][1] * output[i][1]);
	    mag /= windowSize / 2;

	    switch (m_colourScale) {
		
	    default:
	    case LinearColourScale:
		value = int(mag * 50 * 256);
		break;
		
	    case MeterColourScale:
		value = AudioLevel::multiplier_to_preview(mag * 50, 256);
	    break;

	    case dBColourScale:
		mag = 20.0 * log10(mag);
		mag = (mag + 80.0) / 80.0;
		if (mag < 0.0) mag = 0.0;
		if (mag > 1.0) mag = 1.0;
		value = int(mag * 256);
	    }
	}

	if (value > 254) value = 254;
	if (value < 0) value = 0;

	if (m_cacheInvalid || m_exiting) {
	    interrupted = true;
	    break;
	}

	if (column < m_cache->width() && (int)i < m_cache->height()) {
	    m_cache->setPixel(column, i, value + 1); // 0 is "unset"
	}
    }

    if (lock) m_mutex.unlock();
    return !interrupted;
}

void
SpectrogramLayer::CacheFillThread::run()
{
//    std::cerr << "SpectrogramLayer::CacheFillThread::run" << std::endl;

    m_layer.m_mutex.lock();

    while (!m_layer.m_exiting) {

	bool interrupted = false;

//	std::cerr << "SpectrogramLayer::CacheFillThread::run in loop" << std::endl;

	if (m_layer.m_model && m_layer.m_cacheInvalid) {

//	    std::cerr << "SpectrogramLayer::CacheFillThread::run: something to do" << std::endl;

	    while (!m_layer.m_model->isReady()) {
		m_layer.m_condition.wait(&m_layer.m_mutex, 100);
	    }

	    m_layer.m_cachedInitialVisibleArea = false;
	    m_layer.m_cacheInvalid = false;
	    m_fillExtent = 0;
	    m_fillCompletion = 0;

	    std::cerr << "SpectrogramLayer::CacheFillThread::run: model is ready" << std::endl;

	    size_t start = m_layer.m_model->getStartFrame();
	    size_t end = m_layer.m_model->getEndFrame();

	    WindowType windowType = m_layer.m_windowType;
	    size_t windowSize = m_layer.m_windowSize;
	    size_t windowIncrement = m_layer.getWindowIncrement();

	    size_t visibleStart = start;
	    size_t visibleEnd = end;

	    if (m_layer.m_view) {
		if (m_layer.m_view->getStartFrame() < 0) {
		    visibleStart = 0;
		} else {
		    visibleStart = m_layer.m_view->getStartFrame();
		    visibleStart = (visibleStart / windowIncrement) *
			windowIncrement;
		}
		visibleEnd = m_layer.m_view->getEndFrame();
	    }

	    delete m_layer.m_cache;
	    size_t width = (end - start) / windowIncrement + 1;
	    size_t height = windowSize / 2;
	    m_layer.m_cache = new QImage(width, height,
					 QImage::Format_Indexed8);

	    // If we're using JACK in mlock mode, this will be locked
	    // and we ought to unlock to avoid memory exhaustion.
	    // Shame it doesn't appear to be possible to allocate
	    // unlocked in the first place.
	    //!!! hm, I don't think this is working.
	    MUNLOCK((void *)m_layer.m_cache, width * height);
    
	    m_layer.setCacheColourmap();

	    m_layer.m_cache->fill(0);
	    m_layer.m_mutex.unlock();

	    double *input = (double *)
		fftw_malloc(windowSize * sizeof(double));

	    fftw_complex *output = (fftw_complex *)
		fftw_malloc(windowSize * sizeof(fftw_complex));

	    fftw_plan plan = fftw_plan_dft_r2c_1d(windowSize, input,
						  output, FFTW_ESTIMATE);

	    Window<double> windower(windowType, windowSize);

	    if (!plan) {
		std::cerr << "WARNING: fftw_plan_dft_r2c_1d(" << windowSize << ") failed!" << std::endl;
		fftw_free(input);
		fftw_free(output);
		m_layer.m_mutex.lock();
		continue;
	    }

	    int counter = 0;
	    int updateAt = (end / windowIncrement) / 20;
	    if (updateAt < 100) updateAt = 100;

	    bool doVisibleFirst = (visibleStart != start && visibleEnd != end);

	    if (doVisibleFirst) {

		m_layer.m_mutex.lock();

		for (size_t f = visibleStart; f < visibleEnd; f += windowIncrement) {
	    
		    m_layer.fillCacheColumn(int((f - start) / windowIncrement),
					    input, output, plan,
					    windowSize, windowIncrement,
					    windower, false);

		    m_layer.m_mutex.unlock();
		    m_layer.m_mutex.lock();

		    if (m_layer.m_cacheInvalid || m_layer.m_exiting) {
			interrupted = true;
			m_fillExtent = 0;
			break;
		    }

		    if (++counter == updateAt) {
			if (f < end) m_fillExtent = f;
			m_fillCompletion = size_t(100 * fabsf(float(f - visibleStart) /
							      float(end - start)));
			counter = 0;
		    }
		}

		m_layer.m_mutex.unlock();
	    }

	    m_layer.m_cachedInitialVisibleArea = true;

	    if (!interrupted && doVisibleFirst) {
		
		for (size_t f = visibleEnd; f < end; f += windowIncrement) {
	    
		    if (!m_layer.fillCacheColumn(int((f - start) / windowIncrement),
						 input, output, plan,
						 windowSize, windowIncrement,
						 windower, true)) {
			interrupted = true;
			m_fillExtent = 0;
			break;
		    }


		    if (++counter == updateAt) {
			if (f < end) m_fillExtent = f;
			m_fillCompletion = size_t(100 * fabsf(float(f - visibleStart) /
							      float(end - start)));
			counter = 0;
		    }
		}
	    }

	    if (!interrupted) {

		size_t remainingEnd = end;
		if (doVisibleFirst) {
		    remainingEnd = visibleStart;
		    if (remainingEnd > start) --remainingEnd;
		    else remainingEnd = start;
		}
		size_t baseCompletion = m_fillCompletion;

		for (size_t f = start; f < remainingEnd; f += windowIncrement) {

		    if (!m_layer.fillCacheColumn(int((f - start) / windowIncrement),
						 input, output, plan,
						 windowSize, windowIncrement,
						 windower, true)) {
			interrupted = true;
			m_fillExtent = 0;
			break;
		    }
		    
		    if (++counter == updateAt) {
			m_fillExtent = f;
			m_fillCompletion = baseCompletion +
			    size_t(100 * fabsf(float(f - start) /
					       float(end - start)));
			counter = 0;
		    }
		}
	    }

	    fftw_destroy_plan(plan);
	    fftw_free(output);
	    fftw_free(input);

	    if (!interrupted) {
		m_fillExtent = end;
		m_fillCompletion = 100;
	    }

	    m_layer.m_mutex.lock();
	}

	if (!interrupted) m_layer.m_condition.wait(&m_layer.m_mutex, 2000);
    }
}

bool
SpectrogramLayer::getYBinRange(int y, float &q0, float &q1) const
{
    int h = m_view->height();
    if (y < 0 || y >= h) return false;

    // Each pixel in a column is drawn from a possibly non-
    // integral set of frequency bins.

    if (m_frequencyScale == LinearFrequencyScale) {

	size_t bins = m_windowSize / 2;
    
	if (m_maxFrequency > 0) {
	    int sr = m_model->getSampleRate();
	    bins = int((double(m_maxFrequency) * m_windowSize) / sr + 0.1);
	    if (bins > m_windowSize / 2) bins = m_windowSize / 2;
	}
	
	q0 = float(h - y - 1) * bins / h;
	q1 = float(h - y) * bins / h;

    } else {

	// This is all most ad-hoc.  I'm not at my brightest.

	int sr = m_model->getSampleRate();

	float maxf = m_maxFrequency;
	if (maxf == 0.0) maxf = float(sr) / 2;

	float minf = float(sr) / m_windowSize;
	
	float maxlogf = log10f(maxf);
	float minlogf = log10f(minf);

	float logf0 = minlogf + ((maxlogf - minlogf) * (h - y - 1)) / h;
	float logf1 = minlogf + ((maxlogf - minlogf) * (h - y)) / h;
	
	float f0 = pow(10.f, logf0);
	float f1 = pow(10.f, logf1);

	q0 = ((f0 * m_windowSize) / sr) - 1;
	q1 = ((f1 * m_windowSize) / sr) - 1;

//	std::cout << "y=" << y << " h=" << h << " maxf=" << maxf << " maxlogf="
//		  << maxlogf << " logf0=" << logf0 << " f0=" << f0 << " q0="
//		  << q0 << std::endl;
    }	

    return true;
}

bool
SpectrogramLayer::getXBinRange(int x, float &s0, float &s1, LayerRange *range) const
{
    long   startFrame;
    int    zoomLevel;
    size_t modelStart;
    size_t modelEnd;

    if (range) {
	startFrame = range->startFrame;
	zoomLevel  = range->zoomLevel;
	modelStart = range->modelStart;
	modelEnd   = range->modelEnd;
    } else {
	startFrame = m_view->getStartFrame();
        zoomLevel  = m_view->getZoomLevel();
	modelStart = m_model->getStartFrame();
	modelEnd   = m_model->getEndFrame();
    }

    // Each pixel column covers an exact range of sample frames:
    int f0 = startFrame + x * zoomLevel - modelStart;
    int f1 = f0 + zoomLevel - 1;
    
    if (f1 < int(modelStart) || f0 > int(modelEnd)) return false;
    
    // And that range may be drawn from a possibly non-integral
    // range of spectrogram windows:

    size_t windowIncrement = getWindowIncrement();

    s0 = float(f0) / windowIncrement;
    s1 = float(f1) / windowIncrement;

    return true;
}
 
bool
SpectrogramLayer::getXBinSourceRange(int x, RealTime &min, RealTime &max) const
{
    float s0 = 0, s1 = 0;
    if (!getXBinRange(x, s0, s1)) return false;
    
    int s0i = int(s0 + 0.001);
    int s1i = int(s1);

    int windowIncrement = getWindowIncrement();
    int w0 = s0i * windowIncrement - (m_windowSize - windowIncrement)/2;
    int w1 = s1i * windowIncrement + windowIncrement +
	(m_windowSize - windowIncrement)/2 - 1;
    
    min = RealTime::frame2RealTime(w0, m_model->getSampleRate());
    max = RealTime::frame2RealTime(w1, m_model->getSampleRate());
    return true;
}

bool
SpectrogramLayer::getYBinSourceRange(int y, float &freqMin, float &freqMax)
const
{
    float q0 = 0, q1 = 0;
    if (!getYBinRange(y, q0, q1)) return false;

    int q0i = int(q0 + 0.001);
    int q1i = int(q1);

    int sr = m_model->getSampleRate();

    for (int q = q0i; q <= q1i; ++q) {
	int binfreq = (sr * (q + 1)) / m_windowSize;
	if (q == q0i) freqMin = binfreq;
	if (q == q1i) freqMax = binfreq;
    }
    return true;
}
    
bool
SpectrogramLayer::getXYBinSourceRange(int x, int y, float &dbMin, float &dbMax) const
{
    float q0 = 0, q1 = 0;
    if (!getYBinRange(y, q0, q1)) return false;

    float s0 = 0, s1 = 0;
    if (!getXBinRange(x, s0, s1)) return false;
    
    int q0i = int(q0 + 0.001);
    int q1i = int(q1);

    int s0i = int(s0 + 0.001);
    int s1i = int(s1);

    if (m_mutex.tryLock()) {
	if (m_cache && !m_cacheInvalid) {

	    int cw = m_cache->width();
	    int ch = m_cache->height();

	    int min = -1, max = -1;

	    for (int q = q0i; q <= q1i; ++q) {
		for (int s = s0i; s <= s1i; ++s) {
		    if (s >= 0 && q >= 0 && s < cw && q < ch) {
			int value = m_cache->scanLine(q)[s];
			if (min == -1 || value < min) min = value;
			if (max == -1 || value > max) max = value;
		    }	
		}
	    }

	    if (min < 0) return false;

	    dbMin = (float(min) / 256.0) * 80.0 - 80.0;
	    dbMax = (float(max + 1) / 256.0) * 80.0 - 80.1;

	    m_mutex.unlock();
	    return true;
	}

	m_mutex.unlock();
    }

    return false;
}
   
void
SpectrogramLayer::paint(QPainter &paint, QRect rect) const
{
//    Profiler profiler("SpectrogramLayer::paint", true);
#ifdef DEBUG_SPECTROGRAM_REPAINT
    std::cerr << "SpectrogramLayer::paint(): m_model is " << m_model << ", zoom level is " << m_view->getZoomLevel() << ", m_updateTimer " << m_updateTimer << ", pixmap cache invalid " << m_pixmapCacheInvalid << std::endl;
#endif

    if (!m_model || !m_model->isOK() || !m_model->isReady()) {
	return;
    }

#ifdef DEBUG_SPECTROGRAM_REPAINT
    std::cerr << "SpectrogramLayer::paint(): About to lock" << std::endl;
#endif

/*
    if (m_cachedInitialVisibleArea) {
	if (!m_mutex.tryLock()) {
	    m_view->update();
	    return;
	}
    } else {
*/
	m_mutex.lock();
//    }

#ifdef DEBUG_SPECTROGRAM_REPAINT
    std::cerr << "SpectrogramLayer::paint(): locked" << std::endl;
#endif

    if (m_cacheInvalid) { // lock the mutex before checking this
	m_mutex.unlock();
#ifdef DEBUG_SPECTROGRAM_REPAINT
	std::cerr << "SpectrogramLayer::paint(): Cache invalid, returning" << std::endl;
#endif
	return;
    }

    bool stillCacheing = (m_updateTimer != 0);

#ifdef DEBUG_SPECTROGRAM_REPAINT
    std::cerr << "SpectrogramLayer::paint(): Still cacheing = " << stillCacheing << std::endl;
#endif

    long startFrame = m_view->getStartFrame();
    int zoomLevel = m_view->getZoomLevel();

    int x0 = 0;
    int x1 = m_view->width();
    int y0 = 0;
    int y1 = m_view->height();

    bool recreateWholePixmapCache = true;

    if (!m_pixmapCacheInvalid) {

	//!!! This cache may have been obsoleted entirely by the
	//scrolling cache in View.  Perhaps experiment with
	//removing it and see if it makes things even quicker (or else
	//make it optional)

	if (int(m_pixmapCacheZoomLevel) == zoomLevel &&
	    m_pixmapCache->width() == m_view->width() &&
	    m_pixmapCache->height() == m_view->height()) {

	    if (m_pixmapCacheStartFrame / zoomLevel ==
		startFrame / zoomLevel) {
	    
#ifdef DEBUG_SPECTROGRAM_REPAINT
		std::cerr << "SpectrogramLayer: pixmap cache good" << std::endl;
#endif

		m_mutex.unlock();
		paint.drawPixmap(rect, *m_pixmapCache, rect);
		return;

	    } else {

#ifdef DEBUG_SPECTROGRAM_REPAINT
		std::cerr << "SpectrogramLayer: pixmap cache partially OK" << std::endl;
#endif

		recreateWholePixmapCache = false;

		int dx = (m_pixmapCacheStartFrame - startFrame) / zoomLevel;

#ifdef DEBUG_SPECTROGRAM_REPAINT
		std::cerr << "SpectrogramLayer: dx = " << dx << " (pixmap cache " << m_pixmapCache->width() << "x" << m_pixmapCache->height() << ")" << std::endl;
#endif

		if (dx > -m_pixmapCache->width() && dx < m_pixmapCache->width()) {

#if defined(Q_WS_WIN32) || defined(Q_WS_MAC)
		    // Copying a pixmap to itself doesn't work
		    // properly on Windows or Mac (it only works when
		    // moving in one direction).

		    //!!! Need a utility function for this

		    static QPixmap *tmpPixmap = 0;
		    if (!tmpPixmap ||
			tmpPixmap->width() != m_pixmapCache->width() ||
			tmpPixmap->height() != m_pixmapCache->height()) {
			delete tmpPixmap;
			tmpPixmap = new QPixmap(m_pixmapCache->width(),
						m_pixmapCache->height());
		    }
		    QPainter cachePainter;
		    cachePainter.begin(tmpPixmap);
		    cachePainter.drawPixmap(0, 0, *m_pixmapCache);
		    cachePainter.end();
		    cachePainter.begin(m_pixmapCache);
		    cachePainter.drawPixmap(dx, 0, *tmpPixmap);
		    cachePainter.end();
#else
		    QPainter cachePainter(m_pixmapCache);
		    cachePainter.drawPixmap(dx, 0, *m_pixmapCache);
		    cachePainter.end();
#endif

		    paint.drawPixmap(rect, *m_pixmapCache, rect);

		    if (dx < 0) {
			x0 = m_pixmapCache->width() + dx;
			x1 = m_pixmapCache->width();
		    } else {
			x0 = 0;
			x1 = dx;
		    }
		}
	    }
	} else {
#ifdef DEBUG_SPECTROGRAM_REPAINT
	    std::cerr << "SpectrogramLayer: pixmap cache useless" << std::endl;
#endif
	}
    }

    if (stillCacheing) {
	x0 = rect.left();
	x1 = rect.right() + 1;
	y0 = rect.top();
	y1 = rect.bottom() + 1;
    }

    int w = x1 - x0;
    int h = y1 - y0;

//    std::cerr << "x0 " << x0 << ", x1 " << x1 << ", w " << w << ", h " << h << std::endl;

    QImage scaled(w, h, QImage::Format_RGB32);

    LayerRange range = { m_view->getStartFrame(), m_view->getZoomLevel(),
			m_model->getStartFrame(), m_model->getEndFrame() };

    m_mutex.unlock();

    for (int y = 0; y < h; ++y) {

	m_mutex.lock();
	if (m_cacheInvalid) {
	    m_mutex.unlock();
	    break;
	}

	int cw = m_cache->width();
	int ch = m_cache->height();

	float q0 = 0, q1 = 0;

	if (!getYBinRange(y0 + y, q0, q1)) {
	    for (int x = 0; x < w; ++x) {
		assert(x <= scaled.width());
		scaled.setPixel(x, y, qRgb(0, 0, 0));
	    }
	    m_mutex.unlock();
	    continue;
	}

	int q0i = int(q0 + 0.001);
	int q1i = int(q1);

	for (int x = 0; x < w; ++x) {

	    float s0 = 0, s1 = 0;

	    if (!getXBinRange(x0 + x, s0, s1, &range)) {
		assert(x <= scaled.width());
		scaled.setPixel(x, y, qRgb(0, 0, 0));
		continue;
	    }

	    int s0i = int(s0 + 0.001);
	    int s1i = int(s1);

	    float total = 0, divisor = 0;

	    for (int s = s0i; s <= s1i; ++s) {

		float sprop = 1.0;
		if (s == s0i) sprop *= (s + 1) - s0;
		if (s == s1i) sprop *= s1 - s;

		for (int q = q0i; q <= q1i; ++q) {

		    float qprop = sprop;
		    if (q == q0i) qprop *= (q + 1) - q0;
		    if (q == q1i) qprop *= q1 - q;

		    if (s >= 0 && q >= 0 && s < cw && q < ch) {
			total += qprop * m_cache->scanLine(q)[s];
			divisor += qprop;
		    }
		}
	    }
		    
	    if (divisor > 0.0) {
/*
		int pixel = int(total / divisor);
		if (pixel > 255) pixel = 255;
		if (pixel < 1) pixel = 1;
		assert(x <= scaled.width());
		scaled.setPixel(x, y, m_cache->color(pixel));
*/
		float pixel = total / divisor;
		float lq = pixel - int(pixel);
		float hq = int(pixel) + 1 - pixel;
		int pixNum = int(pixel);
		QRgb low = m_cache->color(pixNum > 255 ? 255 : pixNum);
		QRgb high = m_cache->color(pixNum > 254 ? 255 : pixNum + 1);
		QRgb mixed = qRgb
		    (qRed(low) * lq + qRed(high) * hq + 0.01,
		     qGreen(low) * lq + qGreen(high) * hq + 0.01,
		     qBlue(low) * lq + qBlue(high) * hq + 0.01);
		scaled.setPixel(x, y, mixed);

	    } else {
		assert(x <= scaled.width());
		scaled.setPixel(x, y, qRgb(0, 0, 0));
	    }
	}

	m_mutex.unlock();
    }

    paint.drawImage(x0, y0, scaled);

    if (recreateWholePixmapCache) {
	delete m_pixmapCache;
	m_pixmapCache = new QPixmap(w, h);
    }

    QPainter cachePainter(m_pixmapCache);
    cachePainter.drawImage(x0, y0, scaled);
    cachePainter.end();
    
    m_pixmapCacheInvalid = false;
    m_pixmapCacheStartFrame = startFrame;
    m_pixmapCacheZoomLevel = zoomLevel;

#ifdef DEBUG_SPECTROGRAM_REPAINT
    std::cerr << "SpectrogramLayer::paint() returning" << std::endl;
#endif

//!!!    drawLocalFeatureDescription(paint);
}

int
SpectrogramLayer::getCompletion() const
{
    if (m_updateTimer == 0) return 100;
    size_t completion = m_fillThread->getFillCompletion();
//    std::cerr << "SpectrogramLayer::getCompletion: completion = " << completion << std::endl;
    return completion;
}

QRect
SpectrogramLayer::getFeatureDescriptionRect(QPainter &paint, QPoint pos) const
{
    if (!m_model || !m_model->isOK()) return QRect();

    QString timeLabel = tr("Time: ");
    QString freqLabel = tr("Hz: ");
    QString dBLabel = tr("dB: ");

    // assume time is widest
    RealTime rtMin, rtMax;
    if (!getXBinSourceRange(pos.x(), rtMin, rtMax)) return QRect();
    QString timeMinText = QString("%1").arg(rtMin.toText(true).c_str());
    QString timeMaxText = QString(" - %1").arg(rtMax.toText(true).c_str());

    QFontMetrics metrics = paint.fontMetrics();

    int labelwidth = 
	std::max(std::max(metrics.width(timeLabel),
			  metrics.width(freqLabel)),
		 metrics.width(dBLabel));

    int boxwidth = labelwidth + 
	metrics.width(timeMinText) + metrics.width(timeMaxText);

    int fontHeight = metrics.height();
    int boxheight = fontHeight * 3 + 4;

    return QRect(0, 0, boxwidth + 20, boxheight + 15);
}

void
SpectrogramLayer::paintLocalFeatureDescription(QPainter &paint,
					       QRect rect, QPoint pos) const
{
    int x = pos.x();
    int y = pos.y();

    if (!m_model || !m_model->isOK()) return;

    float dbMin = 0, dbMax = 0;
    float freqMin = 0, freqMax = 0;
    RealTime rtMin, rtMax;

    bool haveDb = false;

    if (!getXBinSourceRange(x, rtMin, rtMax)) return;
    if (!getYBinSourceRange(y, freqMin, freqMax)) return;
    if (getXYBinSourceRange(x, y, dbMin, dbMax)) haveDb = true;

    QString timeLabel = tr("Time: ");
    QString freqLabel = tr("Hz: ");
    QString dBLabel = tr("dB: ");

    QString timeMinText = QString("%1").arg(rtMin.toText(true).c_str());
    QString timeMaxText = QString(" - %1").arg(rtMax.toText(true).c_str());

    QString freqMinText = QString("%1").arg(freqMin);
    QString freqMaxText = "";
    if (freqMax != freqMin) {
	freqMaxText = QString(" - %1").arg(freqMax);
    }

    QString dBMinText = "";
    QString dBMaxText = "";

    if (haveDb) {
	int dbmxi = int(dbMax - 0.001);
	int dbmni = int(dbMin - 0.001);
	dBMinText = QString("%1").arg(dbmni);
	if (dbmxi != dbmni) dBMaxText = QString(" - %1").arg(dbmxi);
    }

    QFontMetrics metrics = paint.fontMetrics();

    int labelwidth = 
	std::max(std::max(metrics.width(timeLabel),
			  metrics.width(freqLabel)),
		 metrics.width(dBLabel));

    int minwidth = 
	std::max(std::max(metrics.width(timeMinText),
			  metrics.width(freqMinText)),
		 metrics.width(dBMinText));

    int maxwidth = 
	std::max(std::max(metrics.width(timeMaxText),
			  metrics.width(freqMaxText)),
		 metrics.width(dBMaxText));

    int boxwidth = labelwidth + minwidth + maxwidth;

    int fontAscent = metrics.ascent();
    int fontHeight = metrics.height();

    int boxheight = fontHeight * 3 + 4;

//    paint.setPen(Qt::white);
//    paint.setBrush(Qt::NoBrush);

//!!!    int xbase = m_view->width() - boxwidth - 20;
    int xbase = rect.x() + 5;
    int ybase = rect.y() + 5;

    paint.drawRect(xbase, ybase, boxwidth + 10,
		   boxheight + 10 - metrics.descent() + 1);

    paint.drawText(xbase + 5 + labelwidth - metrics.width(timeLabel),
		   ybase + 5 + fontAscent, timeLabel);

    paint.drawText(xbase + 5 + labelwidth - metrics.width(freqLabel),
		   ybase + 7 + fontAscent + fontHeight, freqLabel);

    paint.drawText(xbase + 5 + labelwidth - metrics.width(dBLabel),
		   ybase + 9 + fontAscent + fontHeight * 2, dBLabel);
    
    paint.drawText(xbase + 5 + labelwidth + minwidth - metrics.width(timeMinText),
		   ybase + 5 + fontAscent, timeMinText);

    paint.drawText(xbase + 5 + labelwidth + minwidth - metrics.width(freqMinText),
		   ybase + 7 + fontAscent + fontHeight, freqMinText);

    paint.drawText(xbase + 5 + labelwidth + minwidth - metrics.width(dBMinText),
		   ybase + 9 + fontAscent + fontHeight * 2, dBMinText);
    
    paint.drawText(xbase + 5 + labelwidth + minwidth,
		   ybase + 5 + fontAscent, timeMaxText);

    paint.drawText(xbase + 5 + labelwidth + minwidth,
		   ybase + 7 + fontAscent + fontHeight, freqMaxText);
    
    paint.drawText(xbase + 5 + labelwidth + minwidth,
		   ybase + 9 + fontAscent + fontHeight * 2, dBMaxText);
}

/*!!!

bool
SpectrogramLayer::identifyLocalFeatures(bool on, int x, int y)
{
    return true; //!!!

    m_identify = on;
    m_identifyX = x;
    m_identifyY = y;

    m_view->update();
*/
/*
    if (!m_model || !m_model->isOK()) return false;

    std::cerr << "SpectrogramLayer::identifyLocalFeatures(" << on << "," << x << "," << y << ")" << std::endl;

    float dbMin = 0, dbMax = 0;
    float freqMin = 0, freqMax = 0;
    RealTime rtMin, rtMax;

    if (getXBinSourceRange(x, rtMin, rtMax)) {
	std::cerr << "Times: " << rtMin << " -> " << rtMax << std::endl;
    } else return false;

    if (getYBinSourceRange(y, freqMin, freqMax)) {
	std::cerr << "Frequencies: " << freqMin << " -> " << freqMax << std::endl;
    } else return false;

    if (getXYBinSourceRange(x, y, dbMin, dbMax)) {
	std::cerr << "dB: " << dbMin << " -> " << dbMax << std::endl;
    }

    m_identifyX = x;
    m_identifyY = y;
    m_identify = true;
*/
    /*!!!
    return true;
}
    */
int
SpectrogramLayer::getVerticalScaleWidth(QPainter &paint) const
{
    if (!m_model || !m_model->isOK()) return 0;

    int tw = paint.fontMetrics().width(QString("%1")
				     .arg(m_maxFrequency > 0 ?
					  m_maxFrequency - 1 :
					  m_model->getSampleRate() / 2));

    int fw = paint.fontMetrics().width(QString("43Hz"));
    if (tw < fw) tw = fw;
    
    return tw + 13;
}

void
SpectrogramLayer::paintVerticalScale(QPainter &paint, QRect rect) const
{
    if (!m_model || !m_model->isOK()) {
	return;
    }

    int h = rect.height(), w = rect.width();

    size_t bins = m_windowSize / 2;
    int sr = m_model->getSampleRate();

    if (m_maxFrequency > 0) {
	bins = int((double(m_maxFrequency) * m_windowSize) / sr + 0.1);
	if (bins > m_windowSize / 2) bins = m_windowSize / 2;
    }

    int py = -1;
    int textHeight = paint.fontMetrics().height();
    int toff = -textHeight + paint.fontMetrics().ascent() + 2;

    int bin = -1;

    for (int y = 0; y < m_view->height(); ++y) {

	float q0, q1;
	if (!getYBinRange(m_view->height() - y, q0, q1)) continue;

	int vy;

	if (int(q0) > bin) {
	    vy = y;
	    bin = int(q0);
	} else {
	    continue;
	}

	int freq = (sr * (bin + 1)) / m_windowSize;

	if (py >= 0 && (vy - py) < textHeight - 1) {
	    paint.drawLine(w - 4, h - vy, w, h - vy);
	    continue;
	}

	QString text = QString("%1").arg(freq);
	if (bin == 0) text = QString("%1Hz").arg(freq);
	paint.drawLine(0, h - vy, w, h - vy);

	if (h - vy - textHeight >= -2) {
	    int tx = w - 10 - paint.fontMetrics().width(text);
	    paint.drawText(tx, h - vy + toff, text);
	}

	py = vy;
    }
}

QString
SpectrogramLayer::toXmlString(QString indent, QString extraAttributes) const
{
    QString s;
    
    s += QString("channel=\"%1\" "
		 "windowSize=\"%2\" "
		 "windowType=\"%3\" "
		 "windowOverlap=\"%4\" "
		 "gain=\"%5\" "
		 "maxFrequency=\"%6\" "
		 "colourScale=\"%7\" "
		 "colourScheme=\"%8\" "
		 "frequencyScale=\"%9\"")
	.arg(m_channel)
	.arg(m_windowSize)
	.arg(m_windowType)
	.arg(m_windowOverlap)
	.arg(m_gain)
	.arg(m_maxFrequency)
	.arg(m_colourScale)
	.arg(m_colourScheme)
	.arg(m_frequencyScale);

    return Layer::toXmlString(indent, extraAttributes + " " + s);
}

void
SpectrogramLayer::setProperties(const QXmlAttributes &attributes)
{
    bool ok = false;

    int channel = attributes.value("channel").toInt(&ok);
    if (ok) setChannel(channel);

    size_t windowSize = attributes.value("windowSize").toUInt(&ok);
    if (ok) setWindowSize(windowSize);

    WindowType windowType = (WindowType)
	attributes.value("windowType").toInt(&ok);
    if (ok) setWindowType(windowType);

    size_t windowOverlap = attributes.value("windowOverlap").toUInt(&ok);
    if (ok) setWindowOverlap(windowOverlap);

    float gain = attributes.value("gain").toFloat(&ok);
    if (ok) setGain(gain);

    size_t maxFrequency = attributes.value("maxFrequency").toUInt(&ok);
    if (ok) setMaxFrequency(maxFrequency);

    ColourScale colourScale = (ColourScale)
	attributes.value("colourScale").toInt(&ok);
    if (ok) setColourScale(colourScale);

    ColourScheme colourScheme = (ColourScheme)
	attributes.value("colourScheme").toInt(&ok);
    if (ok) setColourScheme(colourScheme);

    FrequencyScale frequencyScale = (FrequencyScale)
	attributes.value("frequencyScale").toInt(&ok);
    if (ok) setFrequencyScale(frequencyScale);
}
    

#ifdef INCLUDE_MOCFILES
#include "SpectrogramLayer.moc.cpp"
#endif