qt-everywhere-src-5.15.1/qtmultimedia/src/plugins/wmf/wmfserviceplugin.cpp

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#include <QtCore/qstring.h>
#include <QtCore/qdebug.h>
#include <QtCore/QFile>

#include "wmfserviceplugin.h"
#include "mfplayerservice.h"
#include "mfdecoderservice.h"

#include <mfapi.h>

namespace
{
static int g_refCount = 0;
void addRefCount()
{
    g_refCount++;
    if (g_refCount == 1) {
        CoInitialize(NULL);
        MFStartup(MF_VERSION);
    }
}

void releaseRefCount()
{
    g_refCount--;
    if (g_refCount == 0) {
        MFShutdown();
        CoUninitialize();
    }
}

}

QMediaService* WMFServicePlugin::create(QString const& key)
{
    if (key == QLatin1String(Q_MEDIASERVICE_MEDIAPLAYER)) {
        addRefCount();
        return new MFPlayerService;
    }

    if (key == QLatin1String(Q_MEDIASERVICE_AUDIODECODER)) {
        addRefCount();
        return new MFAudioDecoderService;
    }
    //qDebug() << "unsupported key:" << key;
    return 0;
}

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

QMediaServiceProviderHint::Features WMFServicePlugin::supportedFeatures(
        const QByteArray &service) const
{
    if (service == Q_MEDIASERVICE_MEDIAPLAYER)
        return QMediaServiceProviderHint::StreamPlayback;
    else
        return QMediaServiceProviderHint::Features();
}

QByteArray WMFServicePlugin::defaultDevice(const QByteArray &) const
{
    return QByteArray();
}

QList<QByteArray> WMFServicePlugin::devices(const QByteArray &) const
{
    return QList<QByteArray>();
}

QString WMFServicePlugin::deviceDescription(const QByteArray &, const QByteArray &)
{
    return QString();
}