Qt 5.9 | Qt Multimedia | Audio Devices Example | audiodevices.cpp Example File

Qt 5.9.4 Reference Documentation

# audiodevices.cpp Example File

multimedia/audiodevices/audiodevices.cpp

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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)
      {
          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(sampleRateBox, SIGNAL(activated(int)), SLOT(sampleRateChanged(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"));
                  nearestSampleRate->setText("");
                  nearestChannel->setText("");
                  nearestCodec->setText("");
                  nearestSampleSize->setText("");
                  nearestSampleType->setText("");
                  nearestEndian->setText("");
              } else {
                  QAudioFormat nearest = deviceInfo.nearestFormat(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();

          // 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>();

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

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

          codecsBox->clear();
          QStringList codecs = deviceInfo.supportedCodecs();
          for (int i = 0; i < codecs.size(); ++i)
              codecsBox->addItem(QString("%1").arg(codecs.at(i)));
          if (codecs.size())
              settings.setCodec(codecs.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 sampleRate, deviceInfo.supportedSampleRates()) {
                  format.setSampleRate(sampleRate);
                  foreach (int channels, deviceInfo.supportedChannelCounts()) {
                      format.setChannelCount(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 *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
          settings.setSampleRate(sampleRateBox->itemText(idx).toInt());
      }

      void AudioTest::channelChanged(int idx)
      {
          settings.setChannelCount(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);
          }
      }