#define MAX_FREQ_VALUE 96000
#define MIN_FREQ_VALUE 1000
-const QString AudioSpectrum::directions[] = {"North", "Northeast", "East", "Southeast"};
-
AudioSpectrum::AudioSpectrum(QWidget *parent) :
AbstractAudioScopeWidget(false, parent),
- m_windowFunctions(),
- m_freqMax(10000),
- m_customFreq(false),
- 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_menu->addSeparator();
m_menu->addAction(m_aResetHz);
+ m_menu->removeAction(m_aRealtime);
ui->windowSize->addItem("256", QVariant(256));
ui->windowFunction->addItem(i18n("Hamming window"), FFTTools::Window_Hamming);
- m_cfg = kiss_fftr_alloc(ui->windowSize->itemData(ui->windowSize->currentIndex()).toInt(), 0,0,0);
-
-
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);
+
+ 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_aResetHz;
}
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];
- }
- }
+ // Show the window size used, for information
+ ui->labelFFTSizeNumber->setText(QVariant(fftWindow).toString());
- // Prepare frequency space vector. 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);
- }
+ // 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();
- QVector<float> window;
- float windowScaleFactor = 1;
- if (windowType != FFTTools::Window_Rect) {
- const QString signature = FFTTools::windowSignature(windowType, fftWindow, 0);
- if (m_windowFunctions.contains(signature)) {
-#ifdef DEBUG_AUDIOSPEC
- qDebug() << "Re-using window function with signature " << signature;
-#endif
- window = m_windowFunctions.value(signature);
- } else {
-#ifdef DEBUG_AUDIOSPEC
- qDebug() << "Building new window function with signature " << signature;
-#endif
- window = FFTTools::window(windowType, fftWindow, 0);
- m_windowFunctions.insert(signature, window);
- }
- windowScaleFactor = 1.0/window[fftWindow];
- }
-
- // Normalize signals to [0,1] to get correct dB values later on
- for (int i = 0; i < num_samples && i < fftWindow; i++) {
- if (windowType != FFTTools::Window_Rect) {
- data[i] = (float) audioFrame.data()[i*num_channels] / 32767.0f * window[i];
- } else {
- data[i] = (float) audioFrame.data()[i*num_channels] / 32767.0f;
- }
- }
-
- // Calculate the Fast Fourier Transform for the input data
- kiss_fftr(myCfg, data, freqData);
-
-
- // Logarithmic scale: 20 * log ( 2 * magnitude / N ) with magnitude = sqrt(r² + i²)
- // with N = FFT size (after FFT, 1/2 window size)
- for (int i = 0; i < fftWindow/2; i++) {
- // Logarithmic scale: 20 * log ( 2 * magnitude / N ) with magnitude = sqrt(r² + i²)
- // with N = FFT size (after FFT, 1/2 window size)
- freqSpectrum[i] = 20*log(pow(pow(fabs(freqData[i].r * windowScaleFactor),2) + pow(fabs(freqData[i].i * windowScaleFactor),2), .5)/((float)fftWindow/2.0f))/log(10);;
- }
-
+ m_fftTools.fftNormalized(audioFrame, 0, num_channels, freqSpectrum, windowType, fftWindow, 0);
// Draw the spectrum
}
#endif
- if (customCfg) {
- free(myCfg);
- }
-
return spectrum;
} else {
emit signalScopeRenderingFinished(0, 1);
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) {
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;
+ int x = 0;
+ const int rightBorder = leftDist + m_innerScopeRect.width()-1;
y = topDist + m_innerScopeRect.height() + textDistY;
- for (uint hz = 0; hz <= m_freqMax; hz += hzDiff) {
+ for (uint hz = 0; x <= rightBorder; hz += hzDiff) {
+ davinci.setPen(AbstractScopeWidget::penLight);
x = leftDist + m_innerScopeRect.width() * ((float)hz)/m_freqMax;
- davinci.drawLine(x, topDist, x, topDist + m_innerScopeRect.height()+6);
- if (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 {
- davinci.drawText(x-10, y, i18n("%1 kHz",hz/1000));
+ 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));
}
if (hz > 0) {
- for (uint dHz = 1; dHz < 4; dHz++) {
+ // 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);
}
}
return hud;
}
-QRect AudioSpectrum::scopeRect() {
+QRect AudioSpectrum::scopeRect()
+{
m_scopeRect = QRect(
QPoint(
10, // Left
return m_scopeRect;
}
-
-void AudioSpectrum::slotUpdateCfg()
-{
- free(m_cfg);
- m_cfg = kiss_fftr_alloc(ui->windowSize->itemData(ui->windowSize->currentIndex()).toInt(), 0,0,0);
-}
-
void AudioSpectrum::slotResetMaxFreq()
{
m_customFreq = false;
///// 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 (rescaleDirection == AudioSpectrum::North) {
+ // Nort-South direction: Adjust the dB scale
- if (m_rescaleActive) {
- if (m_rescalePropertiesLocked) {
- // Direction is known, now adjust parameters
+ if ((rescaleModifiers & Qt::ShiftModifier) == 0) {
- // Reset the starting point to make the next moveEvent relative to the current one
- m_rescaleStartPoint = event->pos();
+ // By default adjust the min dB value
+ m_dBmin += movement.y();
+ } else {
- 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 {
-
- // 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] (or rather [MIN_DB_VALUE, 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;
}
+ } 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;
}
- // 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 < MIN_DB_VALUE) {
- m_dBmin = MIN_DB_VALUE;
- m_dBmax = MIN_DB_VALUE+6;
- }
- }
- }
-
- forceUpdateHUD();
- forceUpdateScope();
-
- } else if (m_rescaleClockDirection == AudioSpectrum::East) {
- // East-West direction: Adjust the maximum frequency
- m_freqMax -= 100*movement.x();
- if (m_freqMax < MIN_FREQ_VALUE) {
- m_freqMax = MIN_FREQ_VALUE;
- }
- if (m_freqMax > MAX_FREQ_VALUE) {
- m_freqMax = MAX_FREQ_VALUE;
- }
- m_customFreq = true;
-
- 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;
- }
-#ifdef DEBUG_AUDIOSPEC
- qDebug() << "Diff is " << diff << "; chose " << directions[m_rescaleClockDirection] << " as direction";
-#endif
- m_rescalePropertiesLocked = true;
- }
+ } else if (rescaleDirection == AudioSpectrum::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
projects / kdenlive / blobdiff