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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/qcoreapplication.h>
#include "qplatformcapturablewindows_p.h"
#include "QtCore/private/qfactoryloader_p.h"
#include "private/qplatformmediaformatinfo_p.h"
#include "qplatformmediaplugin_p.h"
class QDummyIntegration : public QPlatformMediaIntegration
{
public:
QDummyIntegration()
{
qCritical("QtMultimedia is not currently supported on this platform or compiler.");
}
};
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)
{
#ifdef QT_DEFAULT_MEDIA_BACKEND
auto backend = QString::fromUtf8(QT_DEFAULT_MEDIA_BACKEND);
if (backends.contains(backend))
return backend;
#endif
#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];
}
namespace {
struct InstanceHolder
{
InstanceHolder()
{
if (!QCoreApplication::instance())
qCCritical(qLcMediaPlugin()) << "Qt Multimedia requires a QCoreApplication 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;
instance.reset(
qLoadPlugin<QPlatformMediaIntegration, QPlatformMediaPlugin>(loader(), backend));
if (!instance) {
qWarning() << "could not load multimedia backend" << backend;
instance = std::make_unique<QDummyIntegration>();
}
}
std::unique_ptr<QPlatformMediaIntegration> instance;
};
Q_GLOBAL_STATIC(InstanceHolder, instanceHolder);
} // namespace
QT_BEGIN_NAMESPACE
QPlatformMediaIntegration *QPlatformMediaIntegration::instance()
{
return instanceHolder->instance.get();
}
QList<QCameraDevice> QPlatformMediaIntegration::videoInputs()
{
auto devices = videoDevices();
return devices ? devices->videoDevices() : QList<QCameraDevice>{};
}
QMaybe<QPlatformAudioInput *> QPlatformMediaIntegration::createAudioInput(QAudioInput *q)
{
return new QPlatformAudioInput(q);
}
QMaybe<QPlatformAudioOutput *> QPlatformMediaIntegration::createAudioOutput(QAudioOutput *q)
{
return new QPlatformAudioOutput(q);
}
QList<QCapturableWindow> QPlatformMediaIntegration::capturableWindowsList()
{
const auto capturableWindows = this->capturableWindows();
return capturableWindows ? capturableWindows->windows() : QList<QCapturableWindow>{};
}
bool QPlatformMediaIntegration::isCapturableWindowValid(const QCapturableWindowPrivate &window)
{
const auto capturableWindows = this->capturableWindows();
return capturableWindows && capturableWindows->isWindowValid(window);
}
const QPlatformMediaFormatInfo *QPlatformMediaIntegration::formatInfo()
{
std::call_once(m_formatInfoOnceFlg, [this]() {
m_formatInfo.reset(createFormatInfo());
Q_ASSERT(m_formatInfo);
});
return m_formatInfo.get();
}
QPlatformMediaFormatInfo *QPlatformMediaIntegration::createFormatInfo()
{
return new QPlatformMediaFormatInfo;
}
QPlatformVideoDevices *QPlatformMediaIntegration::videoDevices()
{
std::call_once(m_videoDevicesOnceFlag,
[this]() { m_videoDevices.reset(createVideoDevices()); });
return m_videoDevices.get();
}
QPlatformCapturableWindows *QPlatformMediaIntegration::capturableWindows()
{
std::call_once(m_capturableWindowsOnceFlag,
[this]() { m_capturableWindows.reset(createCapturableWindows()); });
return m_capturableWindows.get();
}
QPlatformMediaIntegration::QPlatformMediaIntegration() = default;
QPlatformMediaIntegration::~QPlatformMediaIntegration() = default;
QT_END_NAMESPACE
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