* (at your option) any later version. *
***************************************************************************/
+
+
#include "audiospectrum.h"
+#include "ffttools.h"
#include "tools/kiss_fftr.h"
#include <QMenu>
#include <QMouseEvent>
#include <iostream>
-//#include <fstream>
-//bool fileWritten = false;
+// Enables debugging, like writing a GNU Octave .m file to /tmp
+//#define DEBUG_AUDIOSPEC
+#ifdef DEBUG_AUDIOSPEC
+#include <fstream>
+#include <QDebug>
+bool fileWritten = false;
+#endif
-const QString AudioSpectrum::directions[] = {"North", "Northeast", "East", "Southeast"};
+#define MIN_DB_VALUE -120
+#define MAX_FREQ_VALUE 96000
+#define MIN_FREQ_VALUE 1000
AudioSpectrum::AudioSpectrum(QWidget *parent) :
AbstractAudioScopeWidget(false, parent),
- m_rescaleMinDist(8),
- m_rescaleVerticalThreshold(2.0f),
- m_rescaleActive(false),
- m_rescalePropertiesLocked(false),
- m_rescaleScale(1)
+ m_fftTools()
{
ui = new Ui::AudioSpectrum_UI;
ui->setupUi(this);
- m_distance = QSize(65, 30);
- m_freqMax = 10000;
-
- m_aLin = new QAction(i18n("Linear scale"), this);
- m_aLin->setCheckable(true);
- m_aLog = new QAction(i18n("Logarithmic scale"), this);
- m_aLog->setCheckable(true);
+ m_aResetHz = new QAction(i18n("Reset maximum frequency to sampling rate"), this);
- m_agScale = new QActionGroup(this);
- m_agScale->addAction(m_aLin);
- m_agScale->addAction(m_aLog);
- m_aLockHz = new QAction(i18n("Lock maximum frequency"), this);
- m_aLockHz->setCheckable(true);
- m_aLockHz->setEnabled(false);
-
-
-// m_menu->addSeparator()->setText(i18n("Scale"));
-// m_menu->addAction(m_aLin);
-// m_menu->addAction(m_aLog);
m_menu->addSeparator();
- m_menu->addAction(m_aLockHz);
+ m_menu->addAction(m_aResetHz);
+ m_menu->removeAction(m_aRealtime);
ui->windowSize->addItem("256", QVariant(256));
ui->windowSize->addItem("1024", QVariant(1024));
ui->windowSize->addItem("2048", QVariant(2048));
- m_cfg = kiss_fftr_alloc(ui->windowSize->itemData(ui->windowSize->currentIndex()).toInt(), 0,0,0);
+ ui->windowFunction->addItem(i18n("Rectangular window"), FFTTools::Window_Rect);
+ ui->windowFunction->addItem(i18n("Triangular window"), FFTTools::Window_Triangle);
+ ui->windowFunction->addItem(i18n("Hamming window"), FFTTools::Window_Hamming);
bool b = true;
- b &= connect(ui->windowSize, SIGNAL(currentIndexChanged(int)), this, SLOT(slotUpdateCfg()));
+ b &= connect(m_aResetHz, SIGNAL(triggered()), this, SLOT(slotResetMaxFreq()));
+ b &= connect(ui->windowFunction, SIGNAL(currentIndexChanged(int)), this, SLOT(forceUpdate()));
Q_ASSERT(b);
+
+ // Note: These strings are used in both Spectogram and AudioSpectrum. Ideally change both (if necessary) to reduce workload on translators
+ ui->labelFFTSize->setToolTip(i18n("The maximum window size is limited by the number of samples per frame."));
+ ui->windowSize->setToolTip(i18n("A bigger window improves the accuracy at the cost of computational power."));
+ ui->windowFunction->setToolTip(i18n("The rectangular window function is good for signals with equal signal strength (narrow peak), but creates more smearing. See Window function on Wikipedia."));
+
AbstractScopeWidget::init();
}
AudioSpectrum::~AudioSpectrum()
{
writeConfig();
- free(m_cfg);
- delete m_agScale;
- delete m_aLin;
- delete m_aLog;
- delete m_aLockHz;
+ delete m_aResetHz;
}
void AudioSpectrum::readConfig()
KSharedConfigPtr config = KGlobal::config();
KConfigGroup scopeConfig(config, AbstractScopeWidget::configName());
- QString scale = scopeConfig.readEntry("scale");
- if (scale == "lin") {
- m_aLin->setChecked(true);
- } else {
- m_aLog->setChecked(true);
- }
- m_aLockHz->setChecked(scopeConfig.readEntry("lockHz", false));
+
ui->windowSize->setCurrentIndex(scopeConfig.readEntry("windowSize", 0));
+ ui->windowFunction->setCurrentIndex(scopeConfig.readEntry("windowFunction", 0));
m_dBmax = scopeConfig.readEntry("dBmax", 0);
m_dBmin = scopeConfig.readEntry("dBmin", -70);
+ m_freqMax = scopeConfig.readEntry("freqMax", 0);
+ if (m_freqMax == 0) {
+ m_customFreq = false;
+ m_freqMax = 10000;
+ } else {
+ m_customFreq = true;
+ }
}
void AudioSpectrum::writeConfig()
{
KSharedConfigPtr config = KGlobal::config();
KConfigGroup scopeConfig(config, AbstractScopeWidget::configName());
- QString scale;
- if (m_aLin->isChecked()) {
- scale = "lin";
- } else {
- scale = "log";
- }
- scopeConfig.writeEntry("scale", scale);
+
scopeConfig.writeEntry("windowSize", ui->windowSize->currentIndex());
- scopeConfig.writeEntry("lockHz", m_aLockHz->isChecked());
+ scopeConfig.writeEntry("windowFunction", ui->windowFunction->currentIndex());
scopeConfig.writeEntry("dBmax", m_dBmax);
scopeConfig.writeEntry("dBmin", m_dBmin);
+ if (m_customFreq) {
+ scopeConfig.writeEntry("freqMax", m_freqMax);
+ } else {
+ scopeConfig.writeEntry("freqMax", 0);
+ }
+
scopeConfig.sync();
}
QImage AudioSpectrum::renderBackground(uint) { return QImage(); }
-QImage AudioSpectrum::renderAudioScope(uint, const QVector<int16_t> audioFrame, const int freq, const int num_channels, const int num_samples)
+QImage AudioSpectrum::renderAudioScope(uint, const QVector<int16_t> audioFrame, const int freq, const int num_channels,
+ const int num_samples, const int)
{
if (audioFrame.size() > 63) {
- m_freqMax = freq / 2;
+ if (!m_customFreq) {
+ m_freqMax = freq / 2;
+ }
QTime start = QTime::currentTime();
- bool customCfg = false;
- kiss_fftr_cfg myCfg = m_cfg;
+
+ // Determine the window size to use. It should be
+ // * not bigger than the number of samples actually available
+ // * divisible by 2
int fftWindow = ui->windowSize->itemData(ui->windowSize->currentIndex()).toInt();
if (fftWindow > num_samples) {
fftWindow = num_samples;
- customCfg = true;
}
if ((fftWindow & 1) == 1) {
fftWindow--;
- customCfg = true;
- }
- if (customCfg) {
- myCfg = kiss_fftr_alloc(fftWindow, 0,0,0);
- }
-
- float data[fftWindow];
- float freqSpectrum[fftWindow/2];
-
- int16_t maxSig = 0;
- for (int i = 0; i < fftWindow; i++) {
- if (audioFrame.data()[i*num_channels] > maxSig) {
- maxSig = audioFrame.data()[i*num_channels];
- }
- }
-
- // The resulting FFT vector is only half as long
- kiss_fft_cpx freqData[fftWindow/2];
-
-
- // Copy the first channel's audio into a vector for the FFT display
- // (only one channel handled at the moment)
- if (num_samples < fftWindow) {
- std::fill(&data[num_samples], &data[fftWindow-1], 0);
- }
- for (int i = 0; i < num_samples && i < fftWindow; i++) {
- // Normalize signals to [0,1] to get correct dB values later on
- data[i] = (float) audioFrame.data()[i*num_channels] / 32767.0f;
}
- // Calculate the Fast Fourier Transform for the input data
- kiss_fftr(myCfg, data, freqData);
+ // Show the window size used, for information
+ ui->labelFFTSizeNumber->setText(QVariant(fftWindow).toString());
- float val;
- // Get the minimum and the maximum value of the Fourier transformed (for scaling)
- for (int i = 0; i < fftWindow/2; i++) {
- if (m_aLog->isChecked()) {
- // Logarithmic scale: 20 * log ( 2 * magnitude / N )
- // with N = FFT size (after FFT, 1/2 window size)
- val = 20*log(pow(pow(fabs(freqData[i].r),2) + pow(fabs(freqData[i].i),2), .5)/((float)fftWindow/2.0f))/log(10);
- } else {
- // sqrt(r² + i²)
- val = pow(pow(fabs(freqData[i].r),2) + pow(fabs(freqData[i].i),2), .5);
- }
- freqSpectrum[i] = val;
- }
-
+ // Get the spectral power distribution of the input samples,
+ // using the given window size and function
+ float freqSpectrum[fftWindow/2];
+ FFTTools::WindowType windowType = (FFTTools::WindowType) ui->windowFunction->itemData(ui->windowFunction->currentIndex()).toInt();
+ m_fftTools.fftNormalized(audioFrame, 0, num_channels, freqSpectrum, windowType, fftWindow, 0);
// Draw the spectrum
- QImage spectrum(scopeRect().size(), QImage::Format_ARGB32);
+ QImage spectrum(m_scopeRect.size(), QImage::Format_ARGB32);
spectrum.fill(qRgba(0,0,0,0));
- uint w = scopeRect().size().width();
- uint h = scopeRect().size().height();
+ const uint w = m_innerScopeRect.width();
+ const uint h = m_innerScopeRect.height();
+ const uint leftDist = m_innerScopeRect.left() - m_scopeRect.left();
+ const uint topDist = m_innerScopeRect.top() - m_scopeRect.top();
+ float f;
float x;
+ float x_prev = 0;
+ float val;
+ int xi;
for (uint i = 0; i < w; i++) {
- x = i/((float) w) * fftWindow/2;
+ // i: Pixel coordinate
+ // f: Target frequency
+ // x: Frequency array index (float!) corresponding to the pixel
+ // xi: floor(x)
+
+ f = i/((float) w-1.0) * m_freqMax;
+ x = 2*f/freq * (fftWindow/2 - 1);
+ xi = (int) floor(x);
+
+ if (x >= fftWindow/2) {
+ break;
+ }
// Use linear interpolation in order to get smoother display
- if (i == 0 || i == w-1) {
- val = freqSpectrum[i];
+ if (i == 0 || xi == fftWindow/2-1) {
+ // ... except if we are at the left or right border of the display or the spectrum
+ val = freqSpectrum[xi];
} else {
- // Use floor(x)+1 instead of ceil(x) as floor(x) == ceil(x) is possible.
- val = (floor(x)+1 - x)*freqSpectrum[(int) floor(x)] + (x-floor(x))*freqSpectrum[(int) floor(x)+1];
+
+ if (freqSpectrum[xi] > freqSpectrum[xi+1]
+ && x_prev < xi) {
+ // This is a hack to preserve peaks.
+ // Consider f = {0, 100, 0}
+ // x = {0.5, 1.5}
+ // Then x is 50 both times, and the 100 peak is lost.
+ // Get it back here for the first x after the peak.
+ val = freqSpectrum[xi];
+ } else {
+ val = (xi+1 - x) * freqSpectrum[xi]
+ + (x - xi) * freqSpectrum[xi+1];
+ }
}
// freqSpectrum values range from 0 to -inf as they are relative dB values.
for (uint y = 0; y < h*(1 - (val - m_dBmax)/(m_dBmin-m_dBmax)) && y < h; y++) {
- spectrum.setPixel(i, h-y-1, qRgba(225, 182, 255, 255));
+ spectrum.setPixel(leftDist + i, topDist + h-y-1, qRgba(225, 182, 255, 255));
}
+
+ x_prev = x;
}
emit signalScopeRenderingFinished(start.elapsed(), 1);
- /*
+#ifdef DEBUG_AUDIOSPEC
if (!fileWritten || true) {
std::ofstream mFile;
mFile.open("/tmp/freq.m");
} else {
qDebug() << "File already written.";
}
- //*/
-
- if (customCfg) {
- free(myCfg);
- }
+#endif
return spectrum;
} else {
{
QTime start = QTime::currentTime();
- const QRect rect = scopeRect();
// Minimum distance between two lines
const uint minDistY = 30;
const uint minDistX = 40;
- const uint textDist = 5;
- const uint dbDiff = ceil((float)minDistY/rect.height() * (m_dBmax-m_dBmin));
+ const uint textDistX = 10;
+ const uint textDistY = 25;
+ const uint topDist = m_innerScopeRect.top() - m_scopeRect.top();
+ const uint leftDist = m_innerScopeRect.left() - m_scopeRect.left();
+ const uint dbDiff = ceil((float)minDistY/m_innerScopeRect.height() * (m_dBmax-m_dBmin));
- QImage hud(AbstractAudioScopeWidget::rect().size(), QImage::Format_ARGB32);
+ QImage hud(m_scopeRect.size(), QImage::Format_ARGB32);
hud.fill(qRgba(0,0,0,0));
QPainter davinci(&hud);
- davinci.setPen(AbstractAudioScopeWidget::penLight);
+ davinci.setPen(AbstractScopeWidget::penLight);
int y;
for (int db = -dbDiff; db > m_dBmin; db -= dbDiff) {
- y = rect.height() * ((float)db)/(m_dBmin - m_dBmax);
- davinci.drawLine(0, y, rect.width()-1, y);
- davinci.drawText(rect.width() + textDist, y + 8, i18n("%1 dB", m_dBmax + db));
+ y = topDist + m_innerScopeRect.height() * ((float)db)/(m_dBmin - m_dBmax);
+ if (y-topDist > m_innerScopeRect.height()-minDistY+10) {
+ // Abort here, there is still a line left for min dB to paint which needs some room.
+ break;
+ }
+ davinci.drawLine(leftDist, y, leftDist + m_innerScopeRect.width()-1, y);
+ davinci.drawText(leftDist + m_innerScopeRect.width() + textDistX, y + 6, i18n("%1 dB", m_dBmax + db));
}
+ davinci.drawLine(leftDist, topDist, leftDist + m_innerScopeRect.width()-1, topDist);
+ davinci.drawText(leftDist + m_innerScopeRect.width() + textDistX, topDist+6, i18n("%1 dB", m_dBmax));
+ davinci.drawLine(leftDist, topDist+m_innerScopeRect.height()-1, leftDist + m_innerScopeRect.width()-1, topDist+m_innerScopeRect.height()-1);
+ davinci.drawText(leftDist + m_innerScopeRect.width() + textDistX, topDist+m_innerScopeRect.height()+6, i18n("%1 dB", m_dBmin));
+
+ const uint hzDiff = ceil( ((float)minDistX)/m_innerScopeRect.width() * m_freqMax / 1000 ) * 1000;
+ int x = 0;
+ const int rightBorder = leftDist + m_innerScopeRect.width()-1;
+ y = topDist + m_innerScopeRect.height() + textDistY;
+ for (uint hz = 0; x <= rightBorder; hz += hzDiff) {
+ davinci.setPen(AbstractScopeWidget::penLight);
+ x = leftDist + m_innerScopeRect.width() * ((float)hz)/m_freqMax;
+
+ if (x <= rightBorder) {
+ davinci.drawLine(x, topDist, x, topDist + m_innerScopeRect.height()+6);
+ }
+ if (hz < m_freqMax && x+textDistY < leftDist + m_innerScopeRect.width()) {
+ davinci.drawText(x-4, y, QVariant(hz/1000).toString());
+ } else {
+ x = leftDist + m_innerScopeRect.width();
+ davinci.drawLine(x, topDist, x, topDist + m_innerScopeRect.height()+6);
+ davinci.drawText(x-10, y, i18n("%1 kHz").arg((double)m_freqMax/1000, 0, 'f', 1));
+ }
-
- const uint hzDiff = ceil( ((float)minDistX)/rect.width() * m_freqMax / 1000 ) * 1000;
- int x;
- for (uint hz = hzDiff; hz < m_freqMax; hz += hzDiff) {
- x = rect.width() * ((float)hz)/m_freqMax;
- davinci.drawLine(x, 0, x, rect.height()+4);
- davinci.drawText(x-4, rect.height() + 20, QVariant(hz/1000).toString());
+ if (hz > 0) {
+ // Draw finer lines between the main lines
+ davinci.setPen(AbstractScopeWidget::penLightDots);
+ for (uint dHz = 3; dHz > 0; dHz--) {
+ x = leftDist + m_innerScopeRect.width() * ((float)hz - dHz * hzDiff/4.0f)/m_freqMax;
+ if (x > rightBorder) {
+ break;
+ }
+ davinci.drawLine(x, topDist, x, topDist + m_innerScopeRect.height()-1);
+ }
+ }
}
- davinci.drawText(rect.width(), rect.height() + 20, "[kHz]");
emit signalHUDRenderingFinished(start.elapsed(), 1);
return hud;
}
-QRect AudioSpectrum::scopeRect() {
- return QRect(QPoint(0, 0), AbstractAudioScopeWidget::rect().size() - m_distance);
+QRect AudioSpectrum::scopeRect()
+{
+ m_scopeRect = QRect(
+ QPoint(
+ 10, // Left
+ ui->verticalSpacer->geometry().top()+6 // Top
+ ),
+ AbstractAudioScopeWidget::rect().bottomRight()
+ );
+ m_innerScopeRect = QRect(
+ QPoint(
+ m_scopeRect.left()+6, // Left
+ m_scopeRect.top()+6 // Top
+ ), QPoint(
+ ui->verticalSpacer->geometry().right()-70,
+ ui->verticalSpacer->geometry().bottom()-40
+ )
+ );
+ return m_scopeRect;
}
-
-void AudioSpectrum::slotUpdateCfg()
+void AudioSpectrum::slotResetMaxFreq()
{
- free(m_cfg);
- m_cfg = kiss_fftr_alloc(ui->windowSize->itemData(ui->windowSize->currentIndex()).toInt(), 0,0,0);
+ m_customFreq = false;
+ forceUpdateHUD();
+ forceUpdateScope();
}
///// EVENTS /////
-void AudioSpectrum::mouseMoveEvent(QMouseEvent *event)
+void AudioSpectrum::handleMouseDrag(const QPoint movement, const RescaleDirection rescaleDirection, const Qt::KeyboardModifiers rescaleModifiers)
{
- QPoint movement = event->pos()-m_rescaleStartPoint;
-
- if (m_rescaleActive) {
- if (m_rescalePropertiesLocked) {
- // Direction is known, now adjust parameters
+ if (rescaleDirection == North) {
+ // Nort-South direction: Adjust the dB scale
- // Reset the starting point to make the next moveEvent relative to the current one
- m_rescaleStartPoint = event->pos();
+ if ((rescaleModifiers & Qt::ShiftModifier) == 0) {
+ // By default adjust the min dB value
+ m_dBmin += movement.y();
- if (!m_rescaleFirstRescaleDone) {
- // We have just learned the desired direction; Normalize the movement to one pixel
- // to avoid a jump by m_rescaleMinDist
-
- if (movement.x() != 0) {
- movement.setX(movement.x() / abs(movement.x()));
- }
- if (movement.y() != 0) {
- movement.setY(movement.y() / abs(movement.y()));
- }
-
- m_rescaleFirstRescaleDone = true;
- }
-
- if (m_rescaleClockDirection == AudioSpectrum::North) {
- // Nort-South direction: Adjust the dB scale
-
- if ((m_rescaleModifiers & Qt::ShiftModifier) == 0) {
-
- // By default adjust the min dB value
- m_dBmin += movement.y();
-
- } else {
+ } else {
- // Adjust max dB value if Shift is pressed.
- m_dBmax += movement.y();
+ // Adjust max dB value if Shift is pressed.
+ m_dBmax += movement.y();
- }
+ }
- // Ensure the dB values lie in [-100, 0]
- // 0 is the upper bound, everything below -70 dB is most likely noise
+ // Ensure the dB values lie in [-100, 0] (or rather [MIN_DB_VALUE, 0])
+ // 0 is the upper bound, everything below -70 dB is most likely noise
+ if (m_dBmax > 0) {
+ m_dBmax = 0;
+ }
+ if (m_dBmin < MIN_DB_VALUE) {
+ m_dBmin = MIN_DB_VALUE;
+ }
+ // Ensure there is at least 6 dB between the minimum and the maximum value;
+ // lower values hardly make sense
+ if (m_dBmax - m_dBmin < 6) {
+ if ((rescaleModifiers & Qt::ShiftModifier) == 0) {
+ // min was adjusted; Try to adjust the max value to maintain the
+ // minimum dB difference of 6 dB
+ m_dBmax = m_dBmin + 6;
if (m_dBmax > 0) {
m_dBmax = 0;
+ m_dBmin = -6;
}
- if (m_dBmin < -100) {
- m_dBmin = -100;
- }
- // Ensure there is at least 6 dB between the minimum and the maximum value;
- // lower values hardly make sense
- if (m_dBmax - m_dBmin < 6) {
- if ((m_rescaleModifiers & Qt::ShiftModifier) == 0) {
- // min was adjusted; Try to adjust the max value to maintain the
- // minimum dB difference of 6 dB
- m_dBmax = m_dBmin + 6;
- if (m_dBmax > 0) {
- m_dBmax = 0;
- m_dBmin = -6;
- }
- } else {
- // max was adjusted, adjust min
- m_dBmin = m_dBmax - 6;
- if (m_dBmin < -100) {
- m_dBmin = -100;
- m_dBmax = -100+6;
- }
- }
+ } else {
+ // max was adjusted, adjust min
+ m_dBmin = m_dBmax - 6;
+ if (m_dBmin < MIN_DB_VALUE) {
+ m_dBmin = MIN_DB_VALUE;
+ m_dBmax = MIN_DB_VALUE+6;
}
-
- forceUpdateHUD();
- forceUpdateScope();
-
}
+ }
+ forceUpdateHUD();
+ forceUpdateScope();
- } else {
- // Detect the movement direction here.
- // This algorithm relies on the aspect ratio of dy/dx (size and signum).
- if (movement.manhattanLength() > m_rescaleMinDist) {
- float diff = ((float) movement.y())/movement.x();
-
- if (abs(diff) > m_rescaleVerticalThreshold || movement.x() == 0) {
- m_rescaleClockDirection = AudioSpectrum::North;
- } else if (abs(diff) < 1/m_rescaleVerticalThreshold) {
- m_rescaleClockDirection = AudioSpectrum::East;
- } else if (diff < 0) {
- m_rescaleClockDirection = AudioSpectrum::Northeast;
- } else {
- m_rescaleClockDirection = AudioSpectrum::Southeast;
- }
-// qDebug() << "Diff is " << diff << "; chose " << directions[m_rescaleClockDirection] << " as direction";
- m_rescalePropertiesLocked = true;
- }
+ } else if (rescaleDirection == East) {
+ // East-West direction: Adjust the maximum frequency
+ m_freqMax -= 100*movement.x();
+ if (m_freqMax < MIN_FREQ_VALUE) {
+ m_freqMax = MIN_FREQ_VALUE;
}
- } else {
- AbstractAudioScopeWidget::mouseMoveEvent(event);
- }
-}
-
-void AudioSpectrum::mousePressEvent(QMouseEvent *event)
-{
- if (event->button() == Qt::LeftButton) {
- // Rescaling mode starts
- m_rescaleActive = true;
- m_rescalePropertiesLocked = false;
- m_rescaleFirstRescaleDone = false;
- m_rescaleStartPoint = event->pos();
- m_rescaleModifiers = event->modifiers();
+ if (m_freqMax > MAX_FREQ_VALUE) {
+ m_freqMax = MAX_FREQ_VALUE;
+ }
+ m_customFreq = true;
- } else {
- AbstractAudioScopeWidget::mousePressEvent(event);
+ forceUpdateHUD();
+ forceUpdateScope();
}
}
-void AudioSpectrum::mouseReleaseEvent(QMouseEvent *event)
-{
- m_rescaleActive = false;
- m_rescalePropertiesLocked = false;
- AbstractAudioScopeWidget::mouseReleaseEvent(event);
-}
+#ifdef DEBUG_AUDIOSPEC
+#undef DEBUG_AUDIOSPEC
+#endif
+
+#undef MIN_DB_VALUE
+#undef MAX_FREQ_VALUE
+#undef MIN_FREQ_VALUE
projects / kdenlive / blobdiff