qt-everywhere-src-5.14.1/qtmultimedia/examples/multimediawidgets/camera/videosettings.cpp

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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;
        }
    }
}