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# 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);
         }
     }