1 /***************************************************************************
2 * Copyright (C) 2010 by Simon Andreas Eugster (simon.eu@gmail.com) *
3 * This file is part of kdenlive. See www.kdenlive.org. *
5 * This program is free software; you can redistribute it and/or modify *
6 * it under the terms of the GNU General Public License as published by *
7 * the Free Software Foundation; either version 2 of the License, or *
8 * (at your option) any later version. *
9 ***************************************************************************/
13 #include "audiospectrum.h"
15 #include "tools/kiss_fftr.h"
19 #include <QMouseEvent>
23 // Enables debugging, like writing a GNU Octave .m file to /tmp
24 //#define DEBUG_AUDIOSPEC
25 #ifdef DEBUG_AUDIOSPEC
27 bool fileWritten = false;
30 #define MIN_DB_VALUE -120
31 #define MAX_FREQ_VALUE 96000
32 #define MIN_FREQ_VALUE 1000
34 const QString AudioSpectrum::directions[] = {"North", "Northeast", "East", "Southeast"};
36 AudioSpectrum::AudioSpectrum(QWidget *parent) :
37 AbstractAudioScopeWidget(false, parent),
42 m_rescaleVerticalThreshold(2.0f),
43 m_rescaleActive(false),
44 m_rescalePropertiesLocked(false),
47 ui = new Ui::AudioSpectrum_UI;
51 m_aResetHz = new QAction(i18n("Reset maximum frequency to sampling rate"), this);
54 m_menu->addSeparator();
55 m_menu->addAction(m_aResetHz);
58 ui->windowSize->addItem("256", QVariant(256));
59 ui->windowSize->addItem("512", QVariant(512));
60 ui->windowSize->addItem("1024", QVariant(1024));
61 ui->windowSize->addItem("2048", QVariant(2048));
63 ui->windowFunction->addItem(i18n("Rectangular window"), FFTTools::Window_Rect);
64 ui->windowFunction->addItem(i18n("Triangular window"), FFTTools::Window_Triangle);
65 ui->windowFunction->addItem(i18n("Hamming window"), FFTTools::Window_Hamming);
68 m_cfg = kiss_fftr_alloc(ui->windowSize->itemData(ui->windowSize->currentIndex()).toInt(), 0,0,0);
69 //m_windowFunctions.insert("tri512", FFTTools::window(FFTTools::Window_Hamming, 8, 0));
70 // TODO Window function cache
74 b &= connect(ui->windowSize, SIGNAL(currentIndexChanged(int)), this, SLOT(slotUpdateCfg()));
75 b &= connect(m_aResetHz, SIGNAL(triggered()), this, SLOT(slotResetMaxFreq()));
78 AbstractScopeWidget::init();
80 AudioSpectrum::~AudioSpectrum()
88 void AudioSpectrum::readConfig()
90 AbstractScopeWidget::readConfig();
92 KSharedConfigPtr config = KGlobal::config();
93 KConfigGroup scopeConfig(config, AbstractScopeWidget::configName());
95 ui->windowSize->setCurrentIndex(scopeConfig.readEntry("windowSize", 0));
96 ui->windowFunction->setCurrentIndex(scopeConfig.readEntry("windowFunction", 0));
97 m_dBmax = scopeConfig.readEntry("dBmax", 0);
98 m_dBmin = scopeConfig.readEntry("dBmin", -70);
99 m_freqMax = scopeConfig.readEntry("freqMax", 0);
101 if (m_freqMax == 0) {
102 m_customFreq = false;
108 void AudioSpectrum::writeConfig()
110 KSharedConfigPtr config = KGlobal::config();
111 KConfigGroup scopeConfig(config, AbstractScopeWidget::configName());
113 scopeConfig.writeEntry("windowSize", ui->windowSize->currentIndex());
114 scopeConfig.writeEntry("windowFunction", ui->windowFunction->currentIndex());
115 scopeConfig.writeEntry("dBmax", m_dBmax);
116 scopeConfig.writeEntry("dBmin", m_dBmin);
118 scopeConfig.writeEntry("freqMax", m_freqMax);
120 scopeConfig.writeEntry("freqMax", 0);
126 QString AudioSpectrum::widgetName() const { return QString("AudioSpectrum"); }
127 bool AudioSpectrum::isBackgroundDependingOnInput() const { return false; }
128 bool AudioSpectrum::isScopeDependingOnInput() const { return true; }
129 bool AudioSpectrum::isHUDDependingOnInput() const { return false; }
131 QImage AudioSpectrum::renderBackground(uint) { return QImage(); }
133 QImage AudioSpectrum::renderAudioScope(uint, const QVector<int16_t> audioFrame, const int freq, const int num_channels, const int num_samples)
135 if (audioFrame.size() > 63) {
137 m_freqMax = freq / 2;
140 QTime start = QTime::currentTime();
142 bool customCfg = false;
143 kiss_fftr_cfg myCfg = m_cfg;
144 int fftWindow = ui->windowSize->itemData(ui->windowSize->currentIndex()).toInt();
145 if (fftWindow > num_samples) {
146 fftWindow = num_samples;
149 if ((fftWindow & 1) == 1) {
154 myCfg = kiss_fftr_alloc(fftWindow, 0,0,0);
157 float data[fftWindow];
158 float freqSpectrum[fftWindow/2];
161 for (int i = 0; i < fftWindow; i++) {
162 if (audioFrame.data()[i*num_channels] > maxSig) {
163 maxSig = audioFrame.data()[i*num_channels];
167 // Prepare frequency space vector. The resulting FFT vector is only half as long.
168 kiss_fft_cpx freqData[fftWindow/2];
172 // Copy the first channel's audio into a vector for the FFT display
173 // (only one channel handled at the moment)
174 if (num_samples < fftWindow) {
175 std::fill(&data[num_samples], &data[fftWindow-1], 0);
178 FFTTools::WindowType windowType = (FFTTools::WindowType) ui->windowFunction->itemData(ui->windowFunction->currentIndex()).toInt();
179 QVector<float> window;
180 float windowScaleFactor = 1;
181 if (windowType != FFTTools::Window_Rect) {
182 window = FFTTools::window(windowType, fftWindow, 0);
183 windowScaleFactor = 1.0/window[fftWindow];
184 qDebug() << "Using a window scaling factor of " << windowScaleFactor;
187 // Normalize signals to [0,1] to get correct dB values later on
188 for (int i = 0; i < num_samples && i < fftWindow; i++) {
189 if (windowType != FFTTools::Window_Rect) {
190 data[i] = (float) audioFrame.data()[i*num_channels] / 32767.0f * window[i];
192 data[i] = (float) audioFrame.data()[i*num_channels] / 32767.0f;
196 // Calculate the Fast Fourier Transform for the input data
197 kiss_fftr(myCfg, data, freqData);
200 // Logarithmic scale: 20 * log ( 2 * magnitude / N ) with magnitude = sqrt(r² + i²)
201 // with N = FFT size (after FFT, 1/2 window size)
202 for (int i = 0; i < fftWindow/2; i++) {
203 // Logarithmic scale: 20 * log ( 2 * magnitude / N ) with magnitude = sqrt(r² + i²)
204 // with N = FFT size (after FFT, 1/2 window size)
205 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);;
211 QImage spectrum(m_scopeRect.size(), QImage::Format_ARGB32);
212 spectrum.fill(qRgba(0,0,0,0));
213 const uint w = m_innerScopeRect.width();
214 const uint h = m_innerScopeRect.height();
215 const uint leftDist = m_innerScopeRect.left() - m_scopeRect.left();
216 const uint topDist = m_innerScopeRect.top() - m_scopeRect.top();
222 for (uint i = 0; i < w; i++) {
224 // i: Pixel coordinate
225 // f: Target frequency
226 // x: Frequency array index (float!) corresponding to the pixel
229 f = i/((float) w-1.0) * m_freqMax;
230 x = 2*f/freq * (fftWindow/2 - 1);
233 if (x >= fftWindow/2) {
237 // Use linear interpolation in order to get smoother display
238 if (i == 0 || xi == fftWindow/2-1) {
239 // ... except if we are at the left or right border of the display or the spectrum
240 val = freqSpectrum[xi];
243 if (freqSpectrum[xi] > freqSpectrum[xi+1]
245 // This is a hack to preserve peaks.
246 // Consider f = {0, 100, 0}
248 // Then x is 50 both times, and the 100 peak is lost.
249 // Get it back here for the first x after the peak.
250 val = freqSpectrum[xi];
252 val = (xi+1 - x) * freqSpectrum[xi]
253 + (x - xi) * freqSpectrum[xi+1];
257 // freqSpectrum values range from 0 to -inf as they are relative dB values.
258 for (uint y = 0; y < h*(1 - (val - m_dBmax)/(m_dBmin-m_dBmax)) && y < h; y++) {
259 spectrum.setPixel(leftDist + i, topDist + h-y-1, qRgba(225, 182, 255, 255));
265 emit signalScopeRenderingFinished(start.elapsed(), 1);
267 #ifdef DEBUG_AUDIOSPEC
268 if (!fileWritten || true) {
270 mFile.open("/tmp/freq.m");
272 qDebug() << "Opening file failed.";
276 for (int sample = 0; sample < 256; sample++) {
277 mFile << data[sample] << " ";
281 mFile << "freq = [ ";
282 for (int sample = 0; sample < 256; sample++) {
283 mFile << freqData[sample].r << "+" << freqData[sample].i << "*i ";
289 qDebug() << "File written.";
292 qDebug() << "File already written.";
302 emit signalScopeRenderingFinished(0, 1);
306 QImage AudioSpectrum::renderHUD(uint)
308 QTime start = QTime::currentTime();
310 // Minimum distance between two lines
311 const uint minDistY = 30;
312 const uint minDistX = 40;
313 const uint textDistX = 10;
314 const uint textDistY = 25;
315 const uint topDist = m_innerScopeRect.top() - m_scopeRect.top();
316 const uint leftDist = m_innerScopeRect.left() - m_scopeRect.left();
317 const uint dbDiff = ceil((float)minDistY/m_innerScopeRect.height() * (m_dBmax-m_dBmin));
319 QImage hud(m_scopeRect.size(), QImage::Format_ARGB32);
320 hud.fill(qRgba(0,0,0,0));
322 QPainter davinci(&hud);
323 davinci.setPen(AbstractAudioScopeWidget::penLight);
326 for (int db = -dbDiff; db > m_dBmin; db -= dbDiff) {
327 y = topDist + m_innerScopeRect.height() * ((float)db)/(m_dBmin - m_dBmax);
328 if (y-topDist > m_innerScopeRect.height()-minDistY+10) {
329 // Abort here, there is still a line left for min dB to paint which needs some room.
332 davinci.drawLine(leftDist, y, leftDist + m_innerScopeRect.width()-1, y);
333 davinci.drawText(leftDist + m_innerScopeRect.width() + textDistX, y + 6, i18n("%1 dB", m_dBmax + db));
335 davinci.drawLine(leftDist, topDist, leftDist + m_innerScopeRect.width()-1, topDist);
336 davinci.drawText(leftDist + m_innerScopeRect.width() + textDistX, topDist+6, i18n("%1 dB", m_dBmax));
337 davinci.drawLine(leftDist, topDist+m_innerScopeRect.height()-1, leftDist + m_innerScopeRect.width()-1, topDist+m_innerScopeRect.height()-1);
338 davinci.drawText(leftDist + m_innerScopeRect.width() + textDistX, topDist+m_innerScopeRect.height()+6, i18n("%1 dB", m_dBmin));
340 const uint hzDiff = ceil( ((float)minDistX)/m_innerScopeRect.width() * m_freqMax / 1000 ) * 1000;
342 y = topDist + m_innerScopeRect.height() + textDistY;
343 for (uint hz = 0; hz <= m_freqMax; hz += hzDiff) {
344 x = leftDist + m_innerScopeRect.width() * ((float)hz)/m_freqMax;
345 davinci.drawLine(x, topDist, x, topDist + m_innerScopeRect.height()+6);
346 if (hz < m_freqMax) {
347 davinci.drawText(x-4, y, QVariant(hz/1000).toString());
349 davinci.drawText(x-10, y, i18n("%1 kHz",hz/1000));
353 for (uint dHz = 1; dHz < 4; dHz++) {
354 x = leftDist + m_innerScopeRect.width() * ((float)hz - dHz * hzDiff/4.0f)/m_freqMax;
355 davinci.drawLine(x, topDist, x, topDist + m_innerScopeRect.height()-1);
361 emit signalHUDRenderingFinished(start.elapsed(), 1);
365 QRect AudioSpectrum::scopeRect() {
369 ui->verticalSpacer->geometry().top()+6 // Top
371 AbstractAudioScopeWidget::rect().bottomRight()
373 m_innerScopeRect = QRect(
375 m_scopeRect.left()+6, // Left
376 m_scopeRect.top()+6 // Top
378 ui->verticalSpacer->geometry().right()-70,
379 ui->verticalSpacer->geometry().bottom()-40
386 void AudioSpectrum::slotUpdateCfg()
389 m_cfg = kiss_fftr_alloc(ui->windowSize->itemData(ui->windowSize->currentIndex()).toInt(), 0,0,0);
392 void AudioSpectrum::slotResetMaxFreq()
394 m_customFreq = false;
402 void AudioSpectrum::mouseMoveEvent(QMouseEvent *event)
404 QPoint movement = event->pos()-m_rescaleStartPoint;
406 if (m_rescaleActive) {
407 if (m_rescalePropertiesLocked) {
408 // Direction is known, now adjust parameters
410 // Reset the starting point to make the next moveEvent relative to the current one
411 m_rescaleStartPoint = event->pos();
414 if (!m_rescaleFirstRescaleDone) {
415 // We have just learned the desired direction; Normalize the movement to one pixel
416 // to avoid a jump by m_rescaleMinDist
418 if (movement.x() != 0) {
419 movement.setX(movement.x() / abs(movement.x()));
421 if (movement.y() != 0) {
422 movement.setY(movement.y() / abs(movement.y()));
425 m_rescaleFirstRescaleDone = true;
428 if (m_rescaleClockDirection == AudioSpectrum::North) {
429 // Nort-South direction: Adjust the dB scale
431 if ((m_rescaleModifiers & Qt::ShiftModifier) == 0) {
433 // By default adjust the min dB value
434 m_dBmin += movement.y();
438 // Adjust max dB value if Shift is pressed.
439 m_dBmax += movement.y();
443 // Ensure the dB values lie in [-100, 0] (or rather [MIN_DB_VALUE, 0])
444 // 0 is the upper bound, everything below -70 dB is most likely noise
448 if (m_dBmin < MIN_DB_VALUE) {
449 m_dBmin = MIN_DB_VALUE;
451 // Ensure there is at least 6 dB between the minimum and the maximum value;
452 // lower values hardly make sense
453 if (m_dBmax - m_dBmin < 6) {
454 if ((m_rescaleModifiers & Qt::ShiftModifier) == 0) {
455 // min was adjusted; Try to adjust the max value to maintain the
456 // minimum dB difference of 6 dB
457 m_dBmax = m_dBmin + 6;
463 // max was adjusted, adjust min
464 m_dBmin = m_dBmax - 6;
465 if (m_dBmin < MIN_DB_VALUE) {
466 m_dBmin = MIN_DB_VALUE;
467 m_dBmax = MIN_DB_VALUE+6;
475 } else if (m_rescaleClockDirection == AudioSpectrum::East) {
476 // East-West direction: Adjust the maximum frequency
477 m_freqMax -= 100*movement.x();
478 if (m_freqMax < MIN_FREQ_VALUE) {
479 m_freqMax = MIN_FREQ_VALUE;
481 if (m_freqMax > MAX_FREQ_VALUE) {
482 m_freqMax = MAX_FREQ_VALUE;
492 // Detect the movement direction here.
493 // This algorithm relies on the aspect ratio of dy/dx (size and signum).
494 if (movement.manhattanLength() > m_rescaleMinDist) {
495 float diff = ((float) movement.y())/movement.x();
497 if (abs(diff) > m_rescaleVerticalThreshold || movement.x() == 0) {
498 m_rescaleClockDirection = AudioSpectrum::North;
499 } else if (abs(diff) < 1/m_rescaleVerticalThreshold) {
500 m_rescaleClockDirection = AudioSpectrum::East;
501 } else if (diff < 0) {
502 m_rescaleClockDirection = AudioSpectrum::Northeast;
504 m_rescaleClockDirection = AudioSpectrum::Southeast;
506 #ifdef DEBUG_AUDIOSPEC
507 qDebug() << "Diff is " << diff << "; chose " << directions[m_rescaleClockDirection] << " as direction";
509 m_rescalePropertiesLocked = true;
513 AbstractAudioScopeWidget::mouseMoveEvent(event);
517 void AudioSpectrum::mousePressEvent(QMouseEvent *event)
519 if (event->button() == Qt::LeftButton) {
520 // Rescaling mode starts
521 m_rescaleActive = true;
522 m_rescalePropertiesLocked = false;
523 m_rescaleFirstRescaleDone = false;
524 m_rescaleStartPoint = event->pos();
525 m_rescaleModifiers = event->modifiers();
528 AbstractAudioScopeWidget::mousePressEvent(event);
532 void AudioSpectrum::mouseReleaseEvent(QMouseEvent *event)
534 m_rescaleActive = false;
535 m_rescalePropertiesLocked = false;
537 AbstractAudioScopeWidget::mouseReleaseEvent(event);
541 #ifdef DEBUG_AUDIOSPEC
542 #undef DEBUG_AUDIOSPEC
546 #undef MAX_FREQ_VALUE
547 #undef MIN_FREQ_VALUE