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

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 #include <QAudioDeviceInfo>

 #include "audiodevices.h"

 // Utility functions for converting QAudioFormat fields into text

 QString toString(QAudioFormat::SampleType sampleType)
 {
     QString result("Unknown");
     switch (sampleType) {
     case QAudioFormat::SignedInt:
         result = "SignedInt";
         break;
     case QAudioFormat::UnSignedInt:
         result = "UnSignedInt";
         break;
     case QAudioFormat::Float:
         result = "Float";
         break;
     }
     return result;
 }

 QString toString(QAudioFormat::Endian endian)
 {
     QString result("Unknown");
     switch (endian) {
     case QAudioFormat::LittleEndian:
         result = "LittleEndian";
         break;
     case QAudioFormat::BigEndian:
         result = "BigEndian";
         break;
     }
     return result;
 }

 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)));
     connect(populateTableButton, SIGNAL(clicked()), SLOT(populateTable()));

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

 AudioTest::~AudioTest()
 {
 }

 void AudioTest::test()
 {
     // tries to set all the settings picked.
     testResult->clear();

     if (!deviceInfo.isNull()) {
         if (deviceInfo.isFormatSupported(settings)) {
             testResult->setText(tr("Success"));
             nearestFreq->setText("");
             nearestChannel->setText("");
             nearestCodec->setText("");
             nearestSampleSize->setText("");
             nearestSampleType->setText("");
             nearestEndian->setText("");
         } else {
             QAudioFormat nearest = deviceInfo.nearestFormat(settings);
             testResult->setText(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()));
             nearestSampleType->setText(toString(nearest.sampleType()));
             nearestEndian->setText(toString(nearest.byteOrder()));
         }
     }
     else
         testResult->setText(tr("No Device"));
 }

 void AudioTest::modeChanged(int idx)
 {
     testResult->clear();

     // 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));

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

 void AudioTest::deviceChanged(int idx)
 {
     testResult->clear();

     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)
         sampleTypesBox->addItem(toString(sampleTypez.at(i)));
     if (sampleTypez.size())
         settings.setSampleType(sampleTypez.at(0));

     endianBox->clear();
     QList<QAudioFormat::Endian> endianz = deviceInfo.supportedByteOrders();
     for (int i = 0; i < endianz.size(); ++i)
         endianBox->addItem(toString(endianz.at(i)));
     if (endianz.size())
         settings.setByteOrder(endianz.at(0));

     allFormatsTable->clearContents();
 }

 void AudioTest::populateTable()
 {
     int row = 0;

     QAudioFormat format;
     foreach (QString codec, deviceInfo.supportedCodecs()) {
         format.setCodec(codec);
         foreach (int frequency, deviceInfo.supportedFrequencies()) {
             format.setFrequency(frequency);
             foreach (int channels, deviceInfo.supportedChannels()) {
                 format.setChannels(channels);
                 foreach (QAudioFormat::SampleType sampleType, deviceInfo.supportedSampleTypes()) {
                     format.setSampleType(sampleType);
                     foreach (int sampleSize, deviceInfo.supportedSampleSizes()) {
                         format.setSampleSize(sampleSize);
                         foreach (QAudioFormat::Endian endian, deviceInfo.supportedByteOrders()) {
                             format.setByteOrder(endian);
                             if (deviceInfo.isFormatSupported(format)) {
                                 allFormatsTable->setRowCount(row + 1);

                                 QTableWidgetItem *codecItem = new QTableWidgetItem(format.codec());
                                 allFormatsTable->setItem(row, 0, codecItem);

                                 QTableWidgetItem *frequencyItem = new QTableWidgetItem(QString("%1").arg(format.frequency()));
                                 allFormatsTable->setItem(row, 1, frequencyItem);

                                 QTableWidgetItem *channelsItem = new QTableWidgetItem(QString("%1").arg(format.channels()));
                                 allFormatsTable->setItem(row, 2, channelsItem);

                                 QTableWidgetItem *sampleTypeItem = new QTableWidgetItem(toString(format.sampleType()));
                                 allFormatsTable->setItem(row, 3, sampleTypeItem);

                                 QTableWidgetItem *sampleSizeItem = new QTableWidgetItem(QString("%1").arg(format.sampleSize()));
                                 allFormatsTable->setItem(row, 4, sampleSizeItem);

                                 QTableWidgetItem *byteOrderItem = new QTableWidgetItem(toString(format.byteOrder()));
                                 allFormatsTable->setItem(row, 5, byteOrderItem);

                                 ++row;
                             }
                         }
                     }
                 }
             }
         }
     }
 }

 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);
     }
 }