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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 "qffmpegsurfacecapturegrabber_p.h"
#include <qelapsedtimer.h>
#include <qloggingcategory.h>
#include <qthread.h>
#include <qtimer.h>
QT_BEGIN_NAMESPACE
static Q_LOGGING_CATEGORY(qLcScreenCaptureGrabber, "qt.multimedia.ffmpeg.surfacecapturegrabber");
namespace {
class GrabbingProfiler
{
public:
auto measure()
{
m_elapsedTimer.start();
return qScopeGuard([&]() {
const auto nsecsElapsed = m_elapsedTimer.nsecsElapsed();
++m_number;
m_wholeTime += nsecsElapsed;
#ifdef DUMP_SCREEN_CAPTURE_PROFILING
qDebug() << "screen grabbing time:" << nsecsElapsed << "avg:" << avgTime()
<< "number:" << m_number;
#endif
});
}
qreal avgTime() const
{
return m_number ? m_wholeTime / (m_number * 1000000.) : 0.;
}
qint64 number() const
{
return m_number;
}
private:
QElapsedTimer m_elapsedTimer;
qint64 m_wholeTime = 0;
qint64 m_number = 0;
};
} // namespace
struct QFFmpegSurfaceCaptureGrabber::GrabbingContext
{
GrabbingProfiler profiler;
QTimer timer;
QElapsedTimer elapsedTimer;
qint64 lastFrameTime = 0;
};
class QFFmpegSurfaceCaptureGrabber::GrabbingThread : public QThread
{
public:
GrabbingThread(QFFmpegSurfaceCaptureGrabber& grabber)
: m_grabber(grabber)
{}
protected:
void run() override
{
m_grabber.initializeGrabbingContext();
if (!m_grabber.isGrabbingContextInitialized())
return;
exec();
m_grabber.finalizeGrabbingContext();
}
private:
QFFmpegSurfaceCaptureGrabber& m_grabber;
};
QFFmpegSurfaceCaptureGrabber::QFFmpegSurfaceCaptureGrabber(bool runInThread)
{
setFrameRate(DefaultScreenCaptureFrameRate);
if (!runInThread)
return;
m_thread = std::make_unique<GrabbingThread>(*this);
}
void QFFmpegSurfaceCaptureGrabber::start()
{
if (m_thread)
m_thread->start();
else if (!isGrabbingContextInitialized())
initializeGrabbingContext();
}
QFFmpegSurfaceCaptureGrabber::~QFFmpegSurfaceCaptureGrabber() = default;
void QFFmpegSurfaceCaptureGrabber::setFrameRate(qreal rate)
{
rate = qBound(MinScreenCaptureFrameRate, rate, MaxScreenCaptureFrameRate);
if (std::exchange(m_rate, rate) != rate) {
qCDebug(qLcScreenCaptureGrabber) << "Screen capture rate has been changed:" << m_rate;
updateTimerInterval();
}
}
qreal QFFmpegSurfaceCaptureGrabber::frameRate() const
{
return m_rate;
}
void QFFmpegSurfaceCaptureGrabber::stop()
{
if (m_thread)
{
m_thread->quit();
m_thread->wait();
}
else if (isGrabbingContextInitialized())
{
finalizeGrabbingContext();
}
}
void QFFmpegSurfaceCaptureGrabber::updateError(QPlatformSurfaceCapture::Error error,
const QString &description)
{
const auto prevError = std::exchange(m_prevError, error);
if (error != QPlatformSurfaceCapture::NoError
|| prevError != QPlatformSurfaceCapture::NoError) {
emit errorUpdated(error, description);
}
updateTimerInterval();
}
void QFFmpegSurfaceCaptureGrabber::updateTimerInterval()
{
const qreal rate = m_prevError && *m_prevError != QPlatformSurfaceCapture::NoError
? MinScreenCaptureFrameRate
: m_rate;
const int interval = static_cast<int>(1000 / rate);
if (m_context && m_context->timer.interval() != interval)
m_context->timer.setInterval(interval);
}
void QFFmpegSurfaceCaptureGrabber::initializeGrabbingContext()
{
Q_ASSERT(!isGrabbingContextInitialized());
qCDebug(qLcScreenCaptureGrabber) << "screen capture started";
m_context = std::make_unique<GrabbingContext>();
m_context->timer.setTimerType(Qt::PreciseTimer);
updateTimerInterval();
m_context->elapsedTimer.start();
auto doGrab = [this]() {
auto measure = m_context->profiler.measure();
auto frame = grabFrame();
if (frame.isValid()) {
frame.setStartTime(m_context->lastFrameTime);
frame.setEndTime(m_context->elapsedTimer.nsecsElapsed() / 1000);
m_context->lastFrameTime = frame.endTime();
updateError(QPlatformSurfaceCapture::NoError);
emit frameGrabbed(frame);
}
};
doGrab();
m_context->timer.callOnTimeout(&m_context->timer, doGrab);
m_context->timer.start();
}
void QFFmpegSurfaceCaptureGrabber::finalizeGrabbingContext()
{
Q_ASSERT(isGrabbingContextInitialized());
qCDebug(qLcScreenCaptureGrabber)
<< "end screen capture thread; avg grabbing time:" << m_context->profiler.avgTime()
<< "ms, grabbings number:" << m_context->profiler.number();
m_context.reset();
}
bool QFFmpegSurfaceCaptureGrabber::isGrabbingContextInitialized() const
{
return m_context != nullptr;
}
QT_END_NAMESPACE
#include "moc_qffmpegsurfacecapturegrabber_p.cpp"
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