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// Copyright (C) 2021 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
#include <qtmultimediaglobal_p.h>
#include "qplatformmediaintegration_p.h"
#include <qatomic.h>
#include <qmutex.h>
#include <qplatformaudioinput_p.h>
#include <qplatformaudiooutput_p.h>
#include <qplatformvideodevices_p.h>
#include <qmediadevices.h>
#include <qcameradevice.h>
#include <qloggingcategory.h>
#include "QtCore/private/qfactoryloader_p.h"
#include "qplatformmediaplugin_p.h"
class QDummyIntegration : public QPlatformMediaIntegration
{
public:
QDummyIntegration() { qFatal("QtMultimedia is not currently supported on this platform or compiler."); }
QPlatformMediaFormatInfo *formatInfo() override { return nullptr; }
};
static Q_LOGGING_CATEGORY(qLcMediaPlugin, "qt.multimedia.plugin")
Q_GLOBAL_STATIC_WITH_ARGS(QFactoryLoader, loader,
(QPlatformMediaPlugin_iid,
QLatin1String("/multimedia")))
static const auto FFmpegBackend = QStringLiteral("ffmpeg");
static QStringList availableBackends()
{
QStringList list;
if (QFactoryLoader *fl = loader()) {
const auto keyMap = fl->keyMap();
for (auto it = keyMap.constBegin(); it != keyMap.constEnd(); ++it)
if (!list.contains(it.value()))
list << it.value();
}
qCDebug(qLcMediaPlugin) << "Available backends" << list;
return list;
}
static QString defaultBackend(const QStringList &backends)
{
#if defined(Q_OS_DARWIN) || defined(Q_OS_LINUX) || defined(Q_OS_WINDOWS) || defined(Q_OS_ANDROID)
// Return ffmpeg backend by default.
// Platform backends for the OS list are optionally available but have limited support.
if (backends.contains(FFmpegBackend))
return FFmpegBackend;
#else
// Return platform backend (non-ffmpeg) by default.
if (backends.size() > 1 && backends[0] == FFmpegBackend)
return backends[1];
#endif
return backends[0];
}
QT_BEGIN_NAMESPACE
namespace {
struct InstanceHolder {
~InstanceHolder()
{
QMutexLocker locker(&mutex);
instance = nullptr;
}
QBasicMutex mutex;
QPlatformMediaIntegration *instance = nullptr;
QPlatformMediaIntegration *nativeInstance = nullptr;
} instanceHolder;
}
QPlatformMediaIntegration *QPlatformMediaIntegration::instance()
{
QMutexLocker locker(&instanceHolder.mutex);
if (instanceHolder.instance)
return instanceHolder.instance;
const auto backends = availableBackends();
QString backend = QString::fromUtf8(qgetenv("QT_MEDIA_BACKEND"));
if (backend.isEmpty() && !backends.isEmpty())
backend = defaultBackend(backends);
qCDebug(qLcMediaPlugin) << "loading backend" << backend;
instanceHolder.nativeInstance =
qLoadPlugin<QPlatformMediaIntegration, QPlatformMediaPlugin>(loader(), backend);
if (!instanceHolder.nativeInstance) {
qWarning() << "could not load multimedia backend" << backend;
instanceHolder.nativeInstance = new QDummyIntegration;
}
instanceHolder.instance = instanceHolder.nativeInstance;
return instanceHolder.instance;
}
/*
This API is there to be able to test with a mock backend.
*/
void QPlatformMediaIntegration::setIntegration(QPlatformMediaIntegration *integration)
{
if (integration)
instanceHolder.instance = integration;
else
instanceHolder.instance = instanceHolder.nativeInstance;
}
QList<QCameraDevice> QPlatformMediaIntegration::videoInputs()
{
return m_videoDevices ? m_videoDevices->videoDevices() : QList<QCameraDevice>{};
}
QMaybe<QPlatformAudioInput *> QPlatformMediaIntegration::createAudioInput(QAudioInput *q)
{
return new QPlatformAudioInput(q);
}
QMaybe<QPlatformAudioOutput *> QPlatformMediaIntegration::createAudioOutput(QAudioOutput *q)
{
return new QPlatformAudioOutput(q);
}
QPlatformMediaIntegration::QPlatformMediaIntegration() = default;
QPlatformMediaIntegration::~QPlatformMediaIntegration() = default;
QT_END_NAMESPACE
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