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;
         }
     }
 }