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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
#ifndef QFFMPEGSURFACECAPTUREGRABBER_P_H
#define QFFMPEGSURFACECAPTUREGRABBER_P_H
//
// W A R N I N G
// -------------
//
// This file is not part of the Qt API. It exists purely as an
// implementation detail. This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
//
#include "qvideoframe.h"
#include "private/qplatformsurfacecapture_p.h"
#include <memory>
#include <optional>
QT_BEGIN_NAMESPACE
class QThread;
static constexpr qreal DefaultScreenCaptureFrameRate = 60.;
// Mac screens often support 120 frames per sec; it looks, this is not
// needed for the capturing now since it just affects CPI without valuable
// advantages. In the future, the frame rate should be customized by
// user's API.
static constexpr qreal MaxScreenCaptureFrameRate = 60.;
static constexpr qreal MinScreenCaptureFrameRate = 1.;
class QFFmpegSurfaceCaptureGrabber : public QObject
{
Q_OBJECT
public:
enum ThreadPolicy {
UseCurrentThread,
CreateGrabbingThread,
};
QFFmpegSurfaceCaptureGrabber(ThreadPolicy threadPolicy = CreateGrabbingThread);
~QFFmpegSurfaceCaptureGrabber() override;
void start();
void stop();
template<typename Object, typename Method>
void addFrameCallback(Object &object, Method method)
{
connect(this, &QFFmpegSurfaceCaptureGrabber::frameGrabbed,
&object, method, Qt::DirectConnection);
}
signals:
void frameGrabbed(const QVideoFrame&);
void errorUpdated(QPlatformSurfaceCapture::Error error, const QString &description);
protected:
void updateError(QPlatformSurfaceCapture::Error error, const QString &description = {});
virtual QVideoFrame grabFrame() = 0;
void setFrameRate(qreal rate);
qreal frameRate() const;
void updateTimerInterval();
virtual void initializeGrabbingContext();
virtual void finalizeGrabbingContext();
bool isGrabbingContextInitialized() const;
private:
struct GrabbingContext;
class GrabbingThread;
std::unique_ptr<GrabbingContext> m_context;
qreal m_rate = 0;
std::optional<QPlatformSurfaceCapture::Error> m_prevError;
std::unique_ptr<QThread> m_thread;
};
QT_END_NAMESPACE
#endif // QFFMPEGSURFACECAPTUREGRABBER_P_H
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