qt-everywhere-src-5.15.1/qtmultimedia/src/plugins/gstreamer/mediacapture/qgstreamercaptureserviceplugin.cpp

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#include <QtCore/qstring.h>
#include <QtCore/qdebug.h>
#include <QtCore/QDir>
#include <QtCore/QDebug>

#include "qgstreamercaptureserviceplugin.h"

//#define QT_SUPPORTEDMIMETYPES_DEBUG

#include "qgstreamercaptureservice.h"
#include <private/qgstutils_p.h>

QMediaService* QGstreamerCaptureServicePlugin::create(const QString &key)
{
    QGstUtils::initializeGst();

    if (key == QLatin1String(Q_MEDIASERVICE_AUDIOSOURCE))
        return new QGstreamerCaptureService(key);

#if defined(USE_GSTREAMER_CAMERA)
    if (key == QLatin1String(Q_MEDIASERVICE_CAMERA))
        return new QGstreamerCaptureService(key);
#endif

    qWarning() << "Gstreamer capture service plugin: unsupported key:" << key;
    return 0;
}

void QGstreamerCaptureServicePlugin::release(QMediaService *service)
{
    delete service;
}

#if defined(USE_GSTREAMER_CAMERA)
QMediaServiceProviderHint::Features QGstreamerCaptureServicePlugin::supportedFeatures(
        const QByteArray &service) const
{
    if (service == Q_MEDIASERVICE_CAMERA)
        return QMediaServiceProviderHint::VideoSurface;

    return QMediaServiceProviderHint::Features();
}

QByteArray QGstreamerCaptureServicePlugin::defaultDevice(const QByteArray &service) const
{
    return service == Q_MEDIASERVICE_CAMERA
            ? QGstUtils::enumerateCameras().value(0).name.toUtf8()
            : QByteArray();
}

QList<QByteArray> QGstreamerCaptureServicePlugin::devices(const QByteArray &service) const
{
    return service == Q_MEDIASERVICE_CAMERA ? QGstUtils::cameraDevices() : QList<QByteArray>();
}

QString QGstreamerCaptureServicePlugin::deviceDescription(const QByteArray &service, const QByteArray &device)
{
    return service == Q_MEDIASERVICE_CAMERA ? QGstUtils::cameraDescription(device) : QString();
}

QVariant QGstreamerCaptureServicePlugin::deviceProperty(const QByteArray &service, const QByteArray &device, const QByteArray &property)
{
    Q_UNUSED(service);
    Q_UNUSED(device);
    Q_UNUSED(property);
    return QVariant();
}

#endif

QMultimedia::SupportEstimate QGstreamerCaptureServicePlugin::hasSupport(const QString &mimeType,
                                                                     const QStringList& codecs) const
{
    if (m_supportedMimeTypeSet.isEmpty())
        updateSupportedMimeTypes();

    return QGstUtils::hasSupport(mimeType, codecs, m_supportedMimeTypeSet);
}


static bool isEncoderOrMuxer(GstElementFactory *factory)
{
#if GST_CHECK_VERSION(0, 10, 31)
    return gst_element_factory_list_is_type(factory, GST_ELEMENT_FACTORY_TYPE_MUXER)
                || gst_element_factory_list_is_type(factory, GST_ELEMENT_FACTORY_TYPE_ENCODER);
#else
    return (factory
            && (qstrcmp(factory->details.klass, "Codec/Encoder/Audio") == 0
               || qstrcmp(factory->details.klass, "Codec/Encoder/Video") == 0
               || qstrcmp(factory->details.klass, "Codec/Muxer") == 0 ));
#endif
}

void QGstreamerCaptureServicePlugin::updateSupportedMimeTypes() const
{
    m_supportedMimeTypeSet = QGstUtils::supportedMimeTypes(isEncoderOrMuxer);
}

QStringList QGstreamerCaptureServicePlugin::supportedMimeTypes() const
{
    return QStringList();
}