Method applyConnectionSettings

app/src/IO/Drivers/Audio.cpp:1526–1612

* @brief Atomically restores Audio settings, resolving sub-settings by value. */

 * @brief Atomically restores Audio settings, resolving sub-settings by value.
 */
void IO::Drivers::Audio::applyConnectionSettings(const QJsonObject& settings)
{
  if (settings.isEmpty() || isOpen())
    return;

  const auto deviceId     = settings.value(QStringLiteral("deviceId")).toObject();
  const auto savedDevName = deviceId.value(QStringLiteral("inputDeviceName")).toString();
  const int savedDevIndex = settings.value(QStringLiteral("inputDevice")).toInt(-1);

  int deviceIndex = -1;
  if (!savedDevName.isEmpty()) {
    for (int i = 0; i < m_inputDevices.size(); ++i) {
      if (QString::fromUtf8(m_inputDevices[i].name) == savedDevName) {
        deviceIndex = i;
        break;
      }
    }
  }

  if (deviceIndex < 0 && savedDevIndex >= 0 && savedDevIndex < m_inputDevices.size())
    deviceIndex = savedDevIndex;

  if (deviceIndex < 0 || deviceIndex >= m_inputCapabilities.size())
    return;

  m_selectedInputDevice = deviceIndex;
  const auto& caps      = m_inputCapabilities[deviceIndex];

  const int savedRateHz    = deviceId.value(QStringLiteral("sampleRateValue")).toInt(0);
  const int savedRateIndex = settings.value(QStringLiteral("sampleRate")).toInt(-1);

  int rateIndex = -1;
  if (savedRateHz > 0)
    rateIndex = caps.supportedSampleRates.indexOf(savedRateHz);

  if (rateIndex < 0 && savedRateIndex >= 0 && savedRateIndex < caps.supportedSampleRates.size())
    rateIndex = savedRateIndex;

  if (rateIndex < 0) {
#ifdef Q_OS_WIN
    rateIndex = caps.supportedSampleRates.indexOf(22050);
#else
    rateIndex = caps.supportedSampleRates.indexOf(44100);
#endif
  }

  if (rateIndex < 0)
    rateIndex = 0;

  const auto savedFmtName = deviceId.value(QStringLiteral("formatName")).toString();
  const int savedFmtIndex = settings.value(QStringLiteral("inputFormat")).toInt(-1);
  const auto fmtNames     = inputSampleFormats();

  int fmtIndex = -1;
  if (!savedFmtName.isEmpty())
    fmtIndex = fmtNames.indexOf(savedFmtName);

  if (fmtIndex < 0 && savedFmtIndex >= 0 && savedFmtIndex < caps.supportedFormats.size())