videosettings.cpp Example File

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  #include "videosettings.h"
  #include "ui_videosettings.h"

  #include <QComboBox>
  #include <QDebug>
  #include <QMediaRecorder>
  #include <QMediaService>

  VideoSettings::VideoSettings(QMediaRecorder *mediaRecorder, QWidget *parent) :
      QDialog(parent),
      ui(new Ui::VideoSettingsUi),
      mediaRecorder(mediaRecorder)
  {
      ui->setupUi(this);

      //audio codecs
      ui->audioCodecBox->addItem(tr("Default audio codec"), QVariant(QString()));
      const QStringList supportedAudioCodecs =  mediaRecorder->supportedAudioCodecs();
      for (const QString &codecName : supportedAudioCodecs) {
          QString description = mediaRecorder->audioCodecDescription(codecName);
          ui->audioCodecBox->addItem(codecName + ": " + description, QVariant(codecName));
      }

      //sample rate:
      const QList<int>supportedAudioSampleRates = mediaRecorder->supportedAudioSampleRates();
      for (int sampleRate : supportedAudioSampleRates)
          ui->audioSampleRateBox->addItem(QString::number(sampleRate), QVariant(sampleRate));

      ui->audioQualitySlider->setRange(0, int(QMultimedia::VeryHighQuality));

      //video codecs
      ui->videoCodecBox->addItem(tr("Default video codec"), QVariant(QString()));
      const QStringList supportedVideoCodecs = mediaRecorder->supportedVideoCodecs();
      for (const QString &codecName : supportedVideoCodecs) {
          QString description = mediaRecorder->videoCodecDescription(codecName);
          ui->videoCodecBox->addItem(codecName + ": " + description, QVariant(codecName));
      }

      ui->videoQualitySlider->setRange(0, int(QMultimedia::VeryHighQuality));

      ui->videoResolutionBox->addItem(tr("Default"));
      const QList<QSize> supportedResolutions = mediaRecorder->supportedResolutions();
      for (const QSize &resolution : supportedResolutions) {
          ui->videoResolutionBox->addItem(QString("%1x%2").arg(resolution.width()).arg(resolution.height()),
                                          QVariant(resolution));
      }

      ui->videoFramerateBox->addItem(tr("Default"));
      const QList<qreal> supportedFrameRates = mediaRecorder->supportedFrameRates();
      for (qreal rate : supportedFrameRates) {
          QString rateString = QString("%1").arg(rate, 0, 'f', 2);
          ui->videoFramerateBox->addItem(rateString, QVariant(rate));
      }

      //containers
      ui->containerFormatBox->addItem(tr("Default container"), QVariant(QString()));
      const QStringList formats = mediaRecorder->supportedContainers();
      for (const QString &format : formats) {
          ui->containerFormatBox->addItem(format + ": " + mediaRecorder->containerDescription(format),
                                          QVariant(format));
      }
  }

  VideoSettings::~VideoSettings()
  {
      delete ui;
  }

  void VideoSettings::changeEvent(QEvent *e)
  {
      QDialog::changeEvent(e);
      switch (e->type()) {
      case QEvent::LanguageChange:
          ui->retranslateUi(this);
          break;
      default:
          break;
      }
  }

  QAudioEncoderSettings VideoSettings::audioSettings() const
  {
      QAudioEncoderSettings settings = mediaRecorder->audioSettings();
      settings.setCodec(boxValue(ui->audioCodecBox).toString());
      settings.setQuality(QMultimedia::EncodingQuality(ui->audioQualitySlider->value()));
      settings.setSampleRate(boxValue(ui->audioSampleRateBox).toInt());
      return settings;
  }

  void VideoSettings::setAudioSettings(const QAudioEncoderSettings &audioSettings)
  {
      selectComboBoxItem(ui->audioCodecBox, QVariant(audioSettings.codec()));
      selectComboBoxItem(ui->audioSampleRateBox, QVariant(audioSettings.sampleRate()));
      ui->audioQualitySlider->setValue(audioSettings.quality());
  }

  QVideoEncoderSettings VideoSettings::videoSettings() const
  {
      QVideoEncoderSettings settings = mediaRecorder->videoSettings();
      settings.setCodec(boxValue(ui->videoCodecBox).toString());
      settings.setQuality(QMultimedia::EncodingQuality(ui->videoQualitySlider->value()));
      settings.setResolution(boxValue(ui->videoResolutionBox).toSize());
      settings.setFrameRate(boxValue(ui->videoFramerateBox).value<qreal>());

      return settings;
  }

  void VideoSettings::setVideoSettings(const QVideoEncoderSettings &videoSettings)
  {
      selectComboBoxItem(ui->videoCodecBox, QVariant(videoSettings.codec()));
      selectComboBoxItem(ui->videoResolutionBox, QVariant(videoSettings.resolution()));
      ui->videoQualitySlider->setValue(videoSettings.quality());

      //special case for frame rate
      for (int i = 0; i < ui->videoFramerateBox->count(); ++i) {
          qreal itemRate = ui->videoFramerateBox->itemData(i).value<qreal>();
          if (qFuzzyCompare(itemRate, videoSettings.frameRate())) {
              ui->videoFramerateBox->setCurrentIndex(i);
              break;
          }
      }
  }

  QString VideoSettings::format() const
  {
      return boxValue(ui->containerFormatBox).toString();
  }

  void VideoSettings::setFormat(const QString &format)
  {
      selectComboBoxItem(ui->containerFormatBox, QVariant(format));
  }

  QVariant VideoSettings::boxValue(const QComboBox *box) const
  {
      int idx = box->currentIndex();
      if (idx == -1)
          return QVariant();

      return box->itemData(idx);
  }

  void VideoSettings::selectComboBoxItem(QComboBox *box, const QVariant &value)
  {
      for (int i = 0; i < box->count(); ++i) {
          if (box->itemData(i) == value) {
              box->setCurrentIndex(i);
              break;
          }
      }
  }