audiolevels.cpp Example File

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#include "audiolevelsiodevice.h" #include "audiolevels.h" #include <QtDataVisualization/qbardataproxy.h> #include <QtDataVisualization/qvalue3daxis.h> #include <QtDataVisualization/q3dscene.h> #include <QtDataVisualization/q3dcamera.h> #include <QtDataVisualization/qbar3dseries.h> #include <QtDataVisualization/q3dtheme.h> #include <QtDataVisualization/qcustom3dlabel.h> #include <QtMultimedia/QAudioDeviceInfo> #include <QtMultimedia/QAudioInput> using namespace QtDataVisualization; AudioLevels::AudioLevels(Q3DBars *graph, QObject *parent) : QObject(parent), m_graph(graph), m_device(0), m_audioInput(0) { // Set up the graph m_graph->setBarThickness(0.5f); m_graph->setBarSpacing(QSizeF(0.0, 1.0)); m_graph->valueAxis()->setRange(-100.0f, 100.0f); m_graph->valueAxis()->setSegmentCount(20); m_graph->valueAxis()->setLabelFormat(QStringLiteral("%d%%")); m_graph->setShadowQuality(QAbstract3DGraph::ShadowQualityNone); m_graph->setSelectionMode(QAbstract3DGraph::SelectionNone); m_graph->scene()->activeCamera()->setCameraPosition(-25.0f, 10.0f, 190.0f); m_graph->activeTheme()->setType(Q3DTheme::ThemeIsabelle); m_graph->activeTheme()->setGridEnabled(true); m_graph->activeTheme()->setBackgroundEnabled(false); QFont font = m_graph->activeTheme()->font(); font.setPointSize(10); m_graph->activeTheme()->setFont(font); QBar3DSeries *series = new QBar3DSeries; series->setMesh(QAbstract3DSeries::MeshBar); m_graph->addSeries(series); QAudioDeviceInfo inputDevice = QAudioDeviceInfo::defaultInputDevice(); if (inputDevice.supportedSampleRates().size() > 0 && inputDevice.supportedChannelCounts().size() > 0 && inputDevice.supportedSampleSizes().size() > 0 && inputDevice.supportedCodecs().size() > 0) { QAudioFormat formatAudio; formatAudio.setSampleRate(inputDevice.supportedSampleRates().at(0)); formatAudio.setChannelCount(inputDevice.supportedChannelCounts().at(0)); formatAudio.setSampleSize(inputDevice.supportedSampleSizes().at(0)); formatAudio.setCodec(inputDevice.supportedCodecs().at(0)); formatAudio.setByteOrder(QAudioFormat::LittleEndian); formatAudio.setSampleType(QAudioFormat::UnSignedInt); m_audioInput = new QAudioInput(inputDevice, formatAudio, this); #ifdef Q_OS_MAC // OS X seems to wait for entire buffer to fill before calling writeData, so use smaller buffer m_audioInput->setBufferSize(256); #else m_audioInput->setBufferSize(1024); #endif m_device = new AudioLevelsIODevice(m_graph->seriesList().at(0)->dataProxy(), this); m_device->open(QIODevice::WriteOnly); m_audioInput->start(m_device); } else { // No graph content can be shown, so add a custom warning label QCustom3DLabel *titleLabel = new QCustom3DLabel("No valid audio input device found", QFont(), QVector3D(0.2f, 0.2f, 0.0f), QVector3D(1.0f, 1.0f, 0.0f), QQuaternion()); titleLabel->setPositionAbsolute(true); titleLabel->setFacingCamera(true); m_graph->addCustomItem(titleLabel); } } AudioLevels::~AudioLevels() { if (m_audioInput) m_audioInput->stop(); if (m_device) m_device->close(); }

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