qt-everywhere-src-5.15.1/qtmultimedia/src/plugins/gstreamer/audiodecoder/qgstreameraudiodecoderserviceplugin.cpp

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#include "qgstreameraudiodecoderserviceplugin.h"

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

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

// #define QT_SUPPORTEDMIMETYPES_DEBUG

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

    if (key == QLatin1String(Q_MEDIASERVICE_AUDIODECODER))
        return new QGstreamerAudioDecoderService;

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

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

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

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

static bool isDecoderOrDemuxer(GstElementFactory *factory)
{
#if GST_CHECK_VERSION(0, 10, 31)
    return gst_element_factory_list_is_type(factory, GST_ELEMENT_FACTORY_TYPE_DEMUXER)
            || gst_element_factory_list_is_type(factory, GST_ELEMENT_FACTORY_TYPE_DECODER
                                                       | GST_ELEMENT_FACTORY_TYPE_MEDIA_AUDIO);
#else
    return (factory
            && (qstrcmp(factory->details.klass, "Codec/Decoder/Audio") == 0
                || qstrcmp(factory->details.klass, "Codec/Demux") == 0));
#endif
}

void QGstreamerAudioDecoderServicePlugin::updateSupportedMimeTypes() const
{
    m_supportedMimeTypeSet = QGstUtils::supportedMimeTypes(isDecoderOrDemuxer);
}

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