audiodevices.cpp Example File

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  #include "audiodevices.h"

  // Utility functions for converting QAudioFormat fields into text

  static 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;
      case QAudioFormat::Unknown:
          result = "Unknown";
      }
      return result;
  }

  static 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)
      : QMainWindow(parent)
  {
      setupUi(this);
  }

  AudioDevicesBase::~AudioDevicesBase() {}

  AudioTest::AudioTest(QWidget *parent)
      : AudioDevicesBase(parent)
  {
      connect(testButton, &QPushButton::clicked, this, &AudioTest::test);
      connect(modeBox, QOverload<int>::of(&QComboBox::activated), this, &AudioTest::modeChanged);
      connect(deviceBox, QOverload<int>::of(&QComboBox::activated), this, &AudioTest::deviceChanged);
      connect(sampleRateBox, QOverload<int>::of(&QComboBox::activated), this, &AudioTest::sampleRateChanged);
      connect(channelsBox, QOverload<int>::of(&QComboBox::activated), this, &AudioTest::channelChanged);
      connect(codecsBox, QOverload<int>::of(&QComboBox::activated), this, &AudioTest::codecChanged);
      connect(sampleSizesBox, QOverload<int>::of(&QComboBox::activated), this, &AudioTest::sampleSizeChanged);
      connect(sampleTypesBox, QOverload<int>::of(&QComboBox::activated), this, &AudioTest::sampleTypeChanged);
      connect(endianBox, QOverload<int>::of(&QComboBox::activated), this, &AudioTest::endianChanged);
      connect(populateTableButton, &QPushButton::clicked, this, &AudioTest::populateTable);

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

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

      if (!m_deviceInfo.isNull()) {
          if (m_deviceInfo.isFormatSupported(m_settings)) {
              testResult->setText(tr("Success"));
              nearestSampleRate->setText("");
              nearestChannel->setText("");
              nearestCodec->setText("");
              nearestSampleSize->setText("");
              nearestSampleType->setText("");
              nearestEndian->setText("");
          } else {
              QAudioFormat nearest = m_deviceInfo.nearestFormat(m_settings);
              testResult->setText(tr("Failed"));
              nearestSampleRate->setText(QString("%1").arg(nearest.sampleRate()));
              nearestChannel->setText(QString("%1").arg(nearest.channelCount()));
              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();
      deviceBox->clear();
      const QAudio::Mode mode = idx == 0 ? QAudio::AudioInput : QAudio::AudioOutput;
      for (auto &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
      m_deviceInfo = deviceBox->itemData(idx).value<QAudioDeviceInfo>();

      sampleRateBox->clear();
      QList<int> sampleRatez = m_deviceInfo.supportedSampleRates();
      for (int i = 0; i < sampleRatez.size(); ++i)
          sampleRateBox->addItem(QString("%1").arg(sampleRatez.at(i)));
      if (sampleRatez.size())
          m_settings.setSampleRate(sampleRatez.at(0));

      channelsBox->clear();
      QList<int> chz = m_deviceInfo.supportedChannelCounts();
      for (int i = 0; i < chz.size(); ++i)
          channelsBox->addItem(QString("%1").arg(chz.at(i)));
      if (chz.size())
          m_settings.setChannelCount(chz.at(0));

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

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

      sampleTypesBox->clear();
      QList<QAudioFormat::SampleType> sampleTypez = m_deviceInfo.supportedSampleTypes();

      for (int i = 0; i < sampleTypez.size(); ++i)
          sampleTypesBox->addItem(toString(sampleTypez.at(i)));
      if (sampleTypez.size())
          m_settings.setSampleType(sampleTypez.at(0));

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

      allFormatsTable->clearContents();
  }

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

      QAudioFormat format;
      for (auto codec: m_deviceInfo.supportedCodecs()) {
          format.setCodec(codec);
          for (auto sampleRate: m_deviceInfo.supportedSampleRates()) {
              format.setSampleRate(sampleRate);
              for (auto channels: m_deviceInfo.supportedChannelCounts()) {
                  format.setChannelCount(channels);
                  for (auto sampleType: m_deviceInfo.supportedSampleTypes()) {
                      format.setSampleType(sampleType);
                      for (auto sampleSize: m_deviceInfo.supportedSampleSizes()) {
                          format.setSampleSize(sampleSize);
                          for (auto endian: m_deviceInfo.supportedByteOrders()) {
                              format.setByteOrder(endian);
                              if (m_deviceInfo.isFormatSupported(format)) {
                                  allFormatsTable->setRowCount(row + 1);

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

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

                                  QTableWidgetItem *channelsItem = new QTableWidgetItem(QString("%1").arg(format.channelCount()));
                                  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::sampleRateChanged(int idx)
  {
      // sample rate has changed
      m_settings.setSampleRate(sampleRateBox->itemText(idx).toInt());
  }

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

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

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

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

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