audiodevices.cpp Example File
multimedia/audiodevices/audiodevices.cpp

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 #include <QAudioDeviceInfo>

 #include "audiodevices.h"

 AudioDevicesBase::AudioDevicesBase(QWidget *parent, Qt::WFlags f)
     : QMainWindow(parent, f)
 {
     setupUi(this);
 }

 AudioDevicesBase::~AudioDevicesBase() {}

 AudioTest::AudioTest(QWidget *parent, Qt::WFlags f)
     : AudioDevicesBase(parent, f)
 {
     mode = QAudio::AudioOutput;

     connect(testButton, SIGNAL(clicked()), SLOT(test()));
     connect(modeBox, SIGNAL(activated(int)), SLOT(modeChanged(int)));
     connect(deviceBox, SIGNAL(activated(int)), SLOT(deviceChanged(int)));
     connect(frequencyBox, SIGNAL(activated(int)), SLOT(freqChanged(int)));
     connect(channelsBox, SIGNAL(activated(int)), SLOT(channelChanged(int)));
     connect(codecsBox, SIGNAL(activated(int)), SLOT(codecChanged(int)));
     connect(sampleSizesBox, SIGNAL(activated(int)), SLOT(sampleSizeChanged(int)));
     connect(sampleTypesBox, SIGNAL(activated(int)), SLOT(sampleTypeChanged(int)));
     connect(endianBox, SIGNAL(activated(int)), SLOT(endianChanged(int)));

     modeBox->setCurrentIndex(0);
     modeChanged(0);
     deviceBox->setCurrentIndex(0);
     deviceChanged(0);
 }

 AudioTest::~AudioTest()
 {
 }

 void AudioTest::test()
 {
     // tries to set all the settings picked.
     logOutput->clear();
     logOutput->append("NOTE: an invalid codec audio/test exists for testing, to get a fail condition.");

     if (!deviceInfo.isNull()) {
         if (deviceInfo.isFormatSupported(settings)) {
             logOutput->append(tr("Success"));
             nearestFreq->setText("");
             nearestChannel->setText("");
             nearestCodec->setText("");
             nearestSampleSize->setText("");
             nearestSampleType->setText("");
             nearestEndian->setText("");
         } else {
             QAudioFormat nearest = deviceInfo.nearestFormat(settings);
             logOutput->append(tr("Failed"));
             nearestFreq->setText(QString("%1").arg(nearest.frequency()));
             nearestChannel->setText(QString("%1").arg(nearest.channels()));
             nearestCodec->setText(nearest.codec());
             nearestSampleSize->setText(QString("%1").arg(nearest.sampleSize()));

             switch(nearest.sampleType()) {
                 case QAudioFormat::SignedInt:
                     nearestSampleType->setText("SignedInt");
                     break;
                 case QAudioFormat::UnSignedInt:
                     nearestSampleType->setText("UnSignedInt");
                     break;
                 case QAudioFormat::Float:
                     nearestSampleType->setText("Float");
                     break;
                 case QAudioFormat::Unknown:
                     nearestSampleType->setText("Unknown");
             }
             switch(nearest.byteOrder()) {
                 case QAudioFormat::LittleEndian:
                     nearestEndian->setText("LittleEndian");
                     break;
                 case QAudioFormat::BigEndian:
                     nearestEndian->setText("BigEndian");
             }
         }
     }
     else
         logOutput->append(tr("No Device"));
 }

 void AudioTest::modeChanged(int idx)
 {
     // mode has changed
     if (idx == 0)
         mode = QAudio::AudioInput;
     else
         mode = QAudio::AudioOutput;

     deviceBox->clear();
     foreach (const QAudioDeviceInfo &deviceInfo, QAudioDeviceInfo::availableDevices(mode))
         deviceBox->addItem(deviceInfo.deviceName(), qVariantFromValue(deviceInfo));
 }

 void AudioTest::deviceChanged(int idx)
 {
     if (deviceBox->count() == 0)
         return;

     // device has changed
     deviceInfo = deviceBox->itemData(idx).value<QAudioDeviceInfo>();

     frequencyBox->clear();
     QList<int> freqz = deviceInfo.supportedFrequencies();
     for(int i = 0; i < freqz.size(); ++i)
         frequencyBox->addItem(QString("%1").arg(freqz.at(i)));
     if(freqz.size())
         settings.setFrequency(freqz.at(0));

     channelsBox->clear();
     QList<int> chz = deviceInfo.supportedChannels();
     for(int i = 0; i < chz.size(); ++i)
         channelsBox->addItem(QString("%1").arg(chz.at(i)));
     if(chz.size())
         settings.setChannels(chz.at(0));

     codecsBox->clear();
     QStringList codecz = deviceInfo.supportedCodecs();
     for (int i = 0; i < codecz.size(); ++i)
         codecsBox->addItem(QString("%1").arg(codecz.at(i)));
     if (codecz.size())
         settings.setCodec(codecz.at(0));
     // Add false to create failed condition!
     codecsBox->addItem("audio/test");

     sampleSizesBox->clear();
     QList<int> sampleSizez = deviceInfo.supportedSampleSizes();
     for (int i = 0; i < sampleSizez.size(); ++i)
         sampleSizesBox->addItem(QString("%1").arg(sampleSizez.at(i)));
     if (sampleSizez.size())
         settings.setSampleSize(sampleSizez.at(0));

     sampleTypesBox->clear();
     QList<QAudioFormat::SampleType> sampleTypez = deviceInfo.supportedSampleTypes();
     for (int i = 0; i < sampleTypez.size(); ++i) {
         switch(sampleTypez.at(i)) {
             case QAudioFormat::SignedInt:
                 sampleTypesBox->addItem("SignedInt");
                 break;
             case QAudioFormat::UnSignedInt:
                 sampleTypesBox->addItem("UnSignedInt");
                 break;
             case QAudioFormat::Float:
                 sampleTypesBox->addItem("Float");
                 break;
             case QAudioFormat::Unknown:
                 sampleTypesBox->addItem("Unknown");
         }
         if (sampleTypez.size())
             settings.setSampleType(sampleTypez.at(0));
     }

     endianBox->clear();
     QList<QAudioFormat::Endian> endianz = deviceInfo.supportedByteOrders();
     for (int i = 0; i < endianz.size(); ++i) {
         switch (endianz.at(i)) {
             case QAudioFormat::LittleEndian:
                 endianBox->addItem("Little Endian");
                 break;
             case QAudioFormat::BigEndian:
                 endianBox->addItem("Big Endian");
                 break;
         }
     }
     if (endianz.size())
         settings.setByteOrder(endianz.at(0));
 }

 void AudioTest::freqChanged(int idx)
 {
     // freq has changed
     settings.setFrequency(frequencyBox->itemText(idx).toInt());
 }

 void AudioTest::channelChanged(int idx)
 {
     settings.setChannels(channelsBox->itemText(idx).toInt());
 }

 void AudioTest::codecChanged(int idx)
 {
     settings.setCodec(codecsBox->itemText(idx));
 }

 void AudioTest::sampleSizeChanged(int idx)
 {
     settings.setSampleSize(sampleSizesBox->itemText(idx).toInt());
 }

 void AudioTest::sampleTypeChanged(int idx)
 {
     switch (sampleTypesBox->itemText(idx).toInt()) {
         case QAudioFormat::SignedInt:
             settings.setSampleType(QAudioFormat::SignedInt);
             break;
         case QAudioFormat::UnSignedInt:
             settings.setSampleType(QAudioFormat::UnSignedInt);
             break;
         case QAudioFormat::Float:
             settings.setSampleType(QAudioFormat::Float);
     }
 }

 void AudioTest::endianChanged(int idx)
 {
     switch (endianBox->itemText(idx).toInt()) {
         case QAudioFormat::LittleEndian:
             settings.setByteOrder(QAudioFormat::LittleEndian);
             break;
         case QAudioFormat::BigEndian:
             settings.setByteOrder(QAudioFormat::BigEndian);
     }
 }