bbfccc7135
Qt copyrights are now in The Qt Company, so we could update the source code headers accordingly. In the same go we should also fix the links to point to qt.io. Change-Id: I1c6faa4f59f8eca54f01ef20941fa60161dd7872 Reviewed-by: Yoann Lopes <yoann.lopes@theqtcompany.com>
277 lines
9.2 KiB
C++
277 lines
9.2 KiB
C++
/****************************************************************************
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**
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** Copyright (C) 2015 The Qt Company Ltd.
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** Contact: http://www.qt.io/licensing/
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**
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** This file is part of the examples of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:BSD$
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** You may use this file under the terms of the BSD license as follows:
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**
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** "Redistribution and use in source and binary forms, with or without
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** modification, are permitted provided that the following conditions are
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** met:
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** * Redistributions of source code must retain the above copyright
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** notice, this list of conditions and the following disclaimer.
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** * Redistributions in binary form must reproduce the above copyright
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** notice, this list of conditions and the following disclaimer in
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** the documentation and/or other materials provided with the
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** distribution.
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** * Neither the name of The Qt Company Ltd and its Subsidiary(-ies) nor the
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** names of its contributors may be used to endorse or promote products
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** derived from this software without specific prior written permission.
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**
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**
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** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#include "spectrumanalyser.h"
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#include "utils.h"
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#include "fftreal_wrapper.h"
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#include <qmath.h>
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#include <qmetatype.h>
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#include <QAudioFormat>
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#include <QThread>
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SpectrumAnalyserThread::SpectrumAnalyserThread(QObject *parent)
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: QObject(parent)
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#ifndef DISABLE_FFT
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, m_fft(new FFTRealWrapper)
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#endif
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, m_numSamples(SpectrumLengthSamples)
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, m_windowFunction(DefaultWindowFunction)
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, m_window(SpectrumLengthSamples, 0.0)
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, m_input(SpectrumLengthSamples, 0.0)
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, m_output(SpectrumLengthSamples, 0.0)
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, m_spectrum(SpectrumLengthSamples)
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#ifdef SPECTRUM_ANALYSER_SEPARATE_THREAD
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, m_thread(new QThread(this))
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#endif
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{
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#ifdef SPECTRUM_ANALYSER_SEPARATE_THREAD
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// moveToThread() cannot be called on a QObject with a parent
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setParent(0);
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moveToThread(m_thread);
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m_thread->start();
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#endif
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calculateWindow();
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}
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SpectrumAnalyserThread::~SpectrumAnalyserThread()
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{
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#ifndef DISABLE_FFT
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delete m_fft;
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#endif
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}
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void SpectrumAnalyserThread::setWindowFunction(WindowFunction type)
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{
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m_windowFunction = type;
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calculateWindow();
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}
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void SpectrumAnalyserThread::calculateWindow()
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{
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for (int i=0; i<m_numSamples; ++i) {
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DataType x = 0.0;
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switch (m_windowFunction) {
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case NoWindow:
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x = 1.0;
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break;
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case HannWindow:
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x = 0.5 * (1 - qCos((2 * M_PI * i) / (m_numSamples - 1)));
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break;
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default:
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Q_ASSERT(false);
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}
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m_window[i] = x;
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}
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}
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void SpectrumAnalyserThread::calculateSpectrum(const QByteArray &buffer,
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int inputFrequency,
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int bytesPerSample)
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{
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#ifndef DISABLE_FFT
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Q_ASSERT(buffer.size() == m_numSamples * bytesPerSample);
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// Initialize data array
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const char *ptr = buffer.constData();
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for (int i=0; i<m_numSamples; ++i) {
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const qint16 pcmSample = *reinterpret_cast<const qint16*>(ptr);
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// Scale down to range [-1.0, 1.0]
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const DataType realSample = pcmToReal(pcmSample);
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const DataType windowedSample = realSample * m_window[i];
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m_input[i] = windowedSample;
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ptr += bytesPerSample;
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}
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// Calculate the FFT
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m_fft->calculateFFT(m_output.data(), m_input.data());
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// Analyze output to obtain amplitude and phase for each frequency
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for (int i=2; i<=m_numSamples/2; ++i) {
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// Calculate frequency of this complex sample
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m_spectrum[i].frequency = qreal(i * inputFrequency) / (m_numSamples);
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const qreal real = m_output[i];
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qreal imag = 0.0;
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if (i>0 && i<m_numSamples/2)
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imag = m_output[m_numSamples/2 + i];
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const qreal magnitude = sqrt(real*real + imag*imag);
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qreal amplitude = SpectrumAnalyserMultiplier * log(magnitude);
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// Bound amplitude to [0.0, 1.0]
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m_spectrum[i].clipped = (amplitude > 1.0);
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amplitude = qMax(qreal(0.0), amplitude);
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amplitude = qMin(qreal(1.0), amplitude);
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m_spectrum[i].amplitude = amplitude;
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}
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#endif
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emit calculationComplete(m_spectrum);
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}
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//=============================================================================
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// SpectrumAnalyser
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//=============================================================================
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SpectrumAnalyser::SpectrumAnalyser(QObject *parent)
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: QObject(parent)
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, m_thread(new SpectrumAnalyserThread(this))
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, m_state(Idle)
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#ifdef DUMP_SPECTRUMANALYSER
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, m_count(0)
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#endif
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{
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CHECKED_CONNECT(m_thread, SIGNAL(calculationComplete(FrequencySpectrum)),
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this, SLOT(calculationComplete(FrequencySpectrum)));
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}
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SpectrumAnalyser::~SpectrumAnalyser()
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{
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}
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#ifdef DUMP_SPECTRUMANALYSER
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void SpectrumAnalyser::setOutputPath(const QString &outputDir)
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{
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m_outputDir.setPath(outputDir);
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m_textFile.setFileName(m_outputDir.filePath("spectrum.txt"));
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m_textFile.open(QIODevice::WriteOnly | QIODevice::Text);
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m_textStream.setDevice(&m_textFile);
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}
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#endif
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//-----------------------------------------------------------------------------
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// Public functions
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//-----------------------------------------------------------------------------
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void SpectrumAnalyser::setWindowFunction(WindowFunction type)
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{
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const bool b = QMetaObject::invokeMethod(m_thread, "setWindowFunction",
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Qt::AutoConnection,
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Q_ARG(WindowFunction, type));
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Q_ASSERT(b);
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Q_UNUSED(b) // suppress warnings in release builds
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}
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void SpectrumAnalyser::calculate(const QByteArray &buffer,
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const QAudioFormat &format)
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{
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// QThread::currentThread is marked 'for internal use only', but
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// we're only using it for debug output here, so it's probably OK :)
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SPECTRUMANALYSER_DEBUG << "SpectrumAnalyser::calculate"
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<< QThread::currentThread()
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<< "state" << m_state;
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if (isReady()) {
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Q_ASSERT(isPCMS16LE(format));
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const int bytesPerSample = format.sampleSize() * format.channelCount() / 8;
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#ifdef DUMP_SPECTRUMANALYSER
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m_count++;
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const QString pcmFileName = m_outputDir.filePath(QString("spectrum_%1.pcm").arg(m_count, 4, 10, QChar('0')));
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QFile pcmFile(pcmFileName);
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pcmFile.open(QIODevice::WriteOnly);
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const int bufferLength = m_numSamples * bytesPerSample;
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pcmFile.write(buffer, bufferLength);
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m_textStream << "TimeDomain " << m_count << "\n";
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const qint16* input = reinterpret_cast<const qint16*>(buffer);
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for (int i=0; i<m_numSamples; ++i) {
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m_textStream << i << "\t" << *input << "\n";
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input += format.channels();
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}
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#endif
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m_state = Busy;
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// Invoke SpectrumAnalyserThread::calculateSpectrum using QMetaObject. If
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// m_thread is in a different thread from the current thread, the
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// calculation will be done in the child thread.
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// Once the calculation is finished, a calculationChanged signal will be
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// emitted by m_thread.
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const bool b = QMetaObject::invokeMethod(m_thread, "calculateSpectrum",
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Qt::AutoConnection,
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Q_ARG(QByteArray, buffer),
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Q_ARG(int, format.sampleRate()),
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Q_ARG(int, bytesPerSample));
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Q_ASSERT(b);
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Q_UNUSED(b) // suppress warnings in release builds
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#ifdef DUMP_SPECTRUMANALYSER
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m_textStream << "FrequencySpectrum " << m_count << "\n";
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FrequencySpectrum::const_iterator x = m_spectrum.begin();
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for (int i=0; i<m_numSamples; ++i, ++x)
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m_textStream << i << "\t"
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<< x->frequency << "\t"
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<< x->amplitude<< "\t"
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<< x->phase << "\n";
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#endif
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}
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}
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bool SpectrumAnalyser::isReady() const
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{
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return (Idle == m_state);
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}
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void SpectrumAnalyser::cancelCalculation()
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{
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if (Busy == m_state)
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m_state = Cancelled;
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}
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//-----------------------------------------------------------------------------
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// Private slots
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//-----------------------------------------------------------------------------
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void SpectrumAnalyser::calculationComplete(const FrequencySpectrum &spectrum)
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{
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Q_ASSERT(Idle != m_state);
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if (Busy == m_state)
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emit spectrumChanged(spectrum);
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m_state = Idle;
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}
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