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// Copyright (C) 2022 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 "qcgwindowcapture_p.h"
#include "private/qcapturablewindow_p.h"
#include "qffmpegsurfacecapturegrabber_p.h"
#include "private/qabstractvideobuffer_p.h"
#include "qscreen.h"
#include "qguiapplication.h"
#include <qmutex.h>
#include <qwaitcondition.h>
#include <ApplicationServices/ApplicationServices.h>
#include <IOKit/graphics/IOGraphicsLib.h>
#include <AppKit/NSScreen.h>
#include <AppKit/NSApplication.h>
#include <AppKit/NSWindow.h>
namespace {
std::optional<qreal> frameRateForWindow(CGWindowID /*wid*/)
{
// TODO: detect the frame rate
// if (window && window.screen) {
// CGDirectDisplayID displayID = [window.screen.deviceDescription[@"NSScreenNumber"]
// unsignedIntValue]; const auto displayRefreshRate =
// CGDisplayModeGetRefreshRate(CGDisplayCopyDisplayMode(displayID)); if (displayRefreshRate
// > 0 && displayRefreshRate < frameRate) frameRate = displayRefreshRate;
// }
return {};
}
}
QT_BEGIN_NAMESPACE
class QCGImageVideoBuffer : public QAbstractVideoBuffer
{
public:
QCGImageVideoBuffer(CGImageRef image) : QAbstractVideoBuffer(QVideoFrame::NoHandle)
{
auto provider = CGImageGetDataProvider(image);
m_data = CGDataProviderCopyData(provider);
m_bytesPerLine = CGImageGetBytesPerRow(image);
}
~QCGImageVideoBuffer() override { CFRelease(m_data); }
QVideoFrame::MapMode mapMode() const override { return m_mapMode; }
MapData map(QVideoFrame::MapMode mode) override
{
MapData mapData;
if (m_mapMode == QVideoFrame::NotMapped) {
m_mapMode = mode;
mapData.nPlanes = 1;
mapData.bytesPerLine[0] = static_cast<int>(m_bytesPerLine);
mapData.data[0] = (uchar *)CFDataGetBytePtr(m_data);
mapData.size[0] = static_cast<int>(CFDataGetLength(m_data));
}
return mapData;
}
void unmap() override { m_mapMode = QVideoFrame::NotMapped; }
private:
QVideoFrame::MapMode m_mapMode = QVideoFrame::NotMapped;
CFDataRef m_data;
size_t m_bytesPerLine = 0;
};
class QCGWindowCapture::Grabber : public QFFmpegSurfaceCaptureGrabber
{
public:
Grabber(QCGWindowCapture &capture, CGWindowID wid) : m_capture(capture), m_wid(wid)
{
addFrameCallback(*this, &Grabber::onNewFrame);
connect(this, &Grabber::errorUpdated, &capture, &QCGWindowCapture::updateError);
if (auto screen = QGuiApplication::primaryScreen())
setFrameRate(screen->refreshRate());
start();
}
~Grabber() override { stop(); }
QVideoFrameFormat frameFormat() const
{
QMutexLocker<QMutex> locker(&m_formatMutex);
while (!m_format)
m_waitForFormat.wait(&m_formatMutex);
return *m_format;
}
protected:
QVideoFrame grabFrame() override
{
if (auto rate = frameRateForWindow(m_wid))
setFrameRate(*rate);
auto imageRef = CGWindowListCreateImage(CGRectNull, kCGWindowListOptionIncludingWindow,
m_wid, kCGWindowImageBoundsIgnoreFraming);
if (!imageRef) {
updateError(QPlatformSurfaceCapture::CaptureFailed,
QLatin1String("Cannot create image by window"));
return {};
}
auto imageDeleter = qScopeGuard([imageRef]() { CGImageRelease(imageRef); });
if (CGImageGetBitsPerPixel(imageRef) != 32
|| CGImageGetPixelFormatInfo(imageRef) != kCGImagePixelFormatPacked
|| CGImageGetByteOrderInfo(imageRef) != kCGImageByteOrder32Little) {
qWarning() << "Unexpected image format. PixelFormatInfo:"
<< CGImageGetPixelFormatInfo(imageRef)
<< "BitsPerPixel:" << CGImageGetBitsPerPixel(imageRef) << "AlphaInfo"
<< CGImageGetAlphaInfo(imageRef)
<< "ByteOrderInfo:" << CGImageGetByteOrderInfo(imageRef);
updateError(QPlatformSurfaceCapture::CapturingNotSupported,
QLatin1String("Not supported pixel format"));
return {};
}
QVideoFrameFormat format(QSize(CGImageGetWidth(imageRef), CGImageGetHeight(imageRef)),
QVideoFrameFormat::Format_BGRA8888);
format.setFrameRate(frameRate());
return QVideoFrame(new QCGImageVideoBuffer(imageRef), format);
}
void onNewFrame(QVideoFrame frame)
{
// Since writing of the format is supposed to be only from one thread,
// the read-only comparison without a mutex is thread-safe
if (!m_format || m_format != frame.surfaceFormat()) {
QMutexLocker<QMutex> locker(&m_formatMutex);
m_format = frame.surfaceFormat();
locker.unlock();
m_waitForFormat.notify_one();
}
emit m_capture.newVideoFrame(frame);
}
private:
QCGWindowCapture &m_capture;
std::optional<QVideoFrameFormat> m_format;
mutable QMutex m_formatMutex;
mutable QWaitCondition m_waitForFormat;
CGWindowID m_wid;
};
QCGWindowCapture::QCGWindowCapture() : QPlatformSurfaceCapture(WindowSource{})
{
CGRequestScreenCaptureAccess();
}
QCGWindowCapture::~QCGWindowCapture() = default;
bool QCGWindowCapture::setActiveInternal(bool active)
{
if (active) {
if (!CGPreflightScreenCaptureAccess()) {
updateError(QPlatformSurfaceCapture::CaptureFailed,
QLatin1String("Permissions denied"));
return false;
}
auto window = source<WindowSource>();
auto handle = QCapturableWindowPrivate::handle(window);
if (!handle || !handle->id)
updateError(QPlatformSurfaceCapture::NotFound, QLatin1String("Invalid window"));
else
m_grabber = std::make_unique<Grabber>(*this, handle->id);
} else {
m_grabber.reset();
}
return active == static_cast<bool>(m_grabber);
}
QVideoFrameFormat QCGWindowCapture::frameFormat() const
{
return m_grabber ? m_grabber->frameFormat() : QVideoFrameFormat();
}
QT_END_NAMESPACE
#include "moc_qcgwindowcapture_p.cpp"
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