* (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>
+bool fileWritten = false;
+#endif
+
+#define MIN_DB_VALUE -120
const QString AudioSpectrum::directions[] = {"North", "Northeast", "East", "Southeast"};
AudioSpectrum::AudioSpectrum(QWidget *parent) :
AbstractAudioScopeWidget(false, parent),
+ m_windowFunctions(),
m_rescaleMinDist(8),
m_rescaleVerticalThreshold(2.0f),
m_rescaleActive(false),
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_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);
ui->windowSize->addItem("1024", QVariant(1024));
ui->windowSize->addItem("2048", QVariant(2048));
+ 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);
+
+
m_cfg = kiss_fftr_alloc(ui->windowSize->itemData(ui->windowSize->currentIndex()).toInt(), 0,0,0);
+ //m_windowFunctions.insert("tri512", FFTTools::window(FFTTools::Window_Hamming, 8, 0));
+ // TODO Window function cache
bool b = true;
writeConfig();
free(m_cfg);
- delete m_agScale;
- delete m_aLin;
- delete m_aLog;
delete m_aLockHz;
}
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));
m_dBmax = scopeConfig.readEntry("dBmax", 0);
m_dBmin = scopeConfig.readEntry("dBmin", -70);
-
+ ui->windowFunction->setCurrentIndex(scopeConfig.readEntry("windowFunction", 0));
}
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("windowFunction", ui->windowFunction->currentIndex());
scopeConfig.writeEntry("lockHz", m_aLockHz->isChecked());
scopeConfig.writeEntry("dBmax", m_dBmax);
scopeConfig.writeEntry("dBmin", m_dBmin);
}
}
- // The resulting FFT vector is only half as long
+ // 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);
}
+
+ FFTTools::WindowType windowType = (FFTTools::WindowType) ui->windowFunction->itemData(ui->windowFunction->currentIndex()).toInt();
+ QVector<float> window;
+ float windowScaleFactor = 1;
+ if (windowType != FFTTools::Window_Rect) {
+ window = FFTTools::window(windowType, fftWindow, 0);
+ windowScaleFactor = 1.0/window[fftWindow];
+ qDebug() << "Using a window scaling factor of " << windowScaleFactor;
+ }
+
+ // Normalize signals to [0,1] to get correct dB values later on
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;
+ 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);
- float val;
- // Get the minimum and the maximum value of the Fourier transformed (for scaling)
+ float max = -100;
+ // 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++) {
- 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;
+ // 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);;
+ if (freqSpectrum[i] > max) { max = freqSpectrum[i]; }
}
+ qDebug() << "Maximum (dB) is " << max;
// 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();
+ uint w = m_innerScopeRect.width();
+ uint h = m_innerScopeRect.height();
float x;
+ float val;
for (uint i = 0; i < w; i++) {
x = i/((float) w) * fftWindow/2;
emit signalScopeRenderingFinished(start.elapsed(), 1);
- /*
+#ifdef DEBUG_AUDIOSPEC
if (!fileWritten || true) {
std::ofstream mFile;
mFile.open("/tmp/freq.m");
} else {
qDebug() << "File already written.";
}
- //*/
+#endif
if (customCfg) {
free(myCfg);
{
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 dbDiff = ceil((float)minDistY/m_innerScopeRect.height() * (m_dBmax-m_dBmin));
QImage hud(AbstractAudioScopeWidget::rect().size(), QImage::Format_ARGB32);
hud.fill(qRgba(0,0,0,0));
QPainter davinci(&hud);
davinci.setPen(AbstractAudioScopeWidget::penLight);
+ // TODO lower boundary
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 = m_innerScopeRect.height() * ((float)db)/(m_dBmin - m_dBmax);
+ davinci.drawLine(0, y, m_innerScopeRect.width()-1, y);
+ davinci.drawText(m_innerScopeRect.width() + textDist, y + 6, i18n("%1 dB", m_dBmax + db));
}
- const uint hzDiff = ceil( ((float)minDistX)/rect.width() * m_freqMax / 1000 ) * 1000;
+ // TODO more vertical lines in-between
+ const uint hzDiff = ceil( ((float)minDistX)/m_innerScopeRect.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());
+ x = m_innerScopeRect.width() * ((float)hz)/m_freqMax;
+ davinci.drawLine(x, 0, x, m_innerScopeRect.height()+4);
+ davinci.drawText(x-4, m_innerScopeRect.height() + 20, QVariant(hz/1000).toString());
}
- davinci.drawText(rect.width(), rect.height() + 20, "[kHz]");
+ davinci.drawText(m_innerScopeRect.width(), m_innerScopeRect.height() + 20, "[kHz]");
emit signalHUDRenderingFinished(start.elapsed(), 1);
}
QRect AudioSpectrum::scopeRect() {
- return QRect(QPoint(0, 0), AbstractAudioScopeWidget::rect().size() - m_distance);
+ m_innerScopeRect = QRect(
+ QPoint(
+ 0, // Left
+ ui->verticalSpacer->geometry().top() // Top
+ ), QPoint(
+ ui->verticalSpacer->geometry().right()-70,
+ ui->verticalSpacer->geometry().bottom()-40
+ )
+ );
+ m_scopeRect = QRect(
+ m_innerScopeRect.topLeft(),
+ AbstractAudioScopeWidget::rect().bottomRight()
+ );
+ return m_scopeRect;
}
}
- // Ensure the dB values lie in [-100, 0]
+ // 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 < -100) {
- m_dBmin = -100;
+ 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
} else {
// max was adjusted, adjust min
m_dBmin = m_dBmax - 6;
- if (m_dBmin < -100) {
- m_dBmin = -100;
- m_dBmax = -100+6;
+ if (m_dBmin < MIN_DB_VALUE) {
+ m_dBmin = MIN_DB_VALUE;
+ m_dBmax = MIN_DB_VALUE+6;
}
}
}
} else {
m_rescaleClockDirection = AudioSpectrum::Southeast;
}
-// qDebug() << "Diff is " << diff << "; chose " << directions[m_rescaleClockDirection] << " as direction";
+#ifdef DEBUG_AUDIOSPEC
+ qDebug() << "Diff is " << diff << "; chose " << directions[m_rescaleClockDirection] << " as direction";
+#endif
m_rescalePropertiesLocked = true;
}
}
AbstractAudioScopeWidget::mouseReleaseEvent(event);
}
+
+
+#ifdef DEBUG_AUDIOSPEC
+#undef DEBUG_AUDIOSPEC
+#endif
projects / kdenlive / blobdiff