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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 "qavfscreencapture_p.h"
#include "qavfsamplebufferdelegate_p.h"
#include "qffmpegsurfacecapturegrabber_p.h"
#include <qscreen.h>
#define AVMediaType XAVMediaType
#include "qffmpeghwaccel_p.h"
extern "C" {
#include <libavutil/hwcontext_videotoolbox.h>
#include <libavutil/hwcontext.h>
}
#undef AVMediaType
#include <AppKit/NSScreen.h>
#include <dispatch/dispatch.h>
namespace {
const auto DefaultCVPixelFormat = kCVPixelFormatType_32BGRA;
CGDirectDisplayID findDisplayByName(const QString &name)
{
for (NSScreen *screen in NSScreen.screens) {
if (name == QString::fromNSString(screen.localizedName))
return [screen.deviceDescription[@"NSScreenNumber"] unsignedIntValue];
}
return kCGNullDirectDisplay;
}
}
QT_BEGIN_NAMESPACE
QAVFScreenCapture::QAVFScreenCapture() : QPlatformSurfaceCapture(ScreenSource{})
{
CGRequestScreenCaptureAccess();
}
QAVFScreenCapture::~QAVFScreenCapture()
{
resetCapture();
}
bool QAVFScreenCapture::setActiveInternal(bool active)
{
if (active) {
if (!CGPreflightScreenCaptureAccess()) {
updateError(CaptureFailed, QLatin1String("Permissions denied"));
return false;
}
auto screen = source<ScreenSource>();
if (!checkScreenWithError(screen))
return false;
return initScreenCapture(screen);
} else {
resetCapture();
}
return true;
}
void QAVFScreenCapture::onNewFrame(const 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 newVideoFrame(frame);
}
QVideoFrameFormat QAVFScreenCapture::frameFormat() const
{
if (!m_grabber)
return {};
QMutexLocker<QMutex> locker(&m_formatMutex);
while (!m_format)
m_waitForFormat.wait(&m_formatMutex);
return *m_format;
}
std::optional<int> QAVFScreenCapture::ffmpegHWPixelFormat() const
{
return AV_PIX_FMT_VIDEOTOOLBOX;
}
class QAVFScreenCapture::Grabber
{
public:
Grabber(QAVFScreenCapture &capture, QScreen *screen, CGDirectDisplayID screenID,
std::unique_ptr<QFFmpeg::HWAccel> hwAccel)
{
m_captureSession = [[AVCaptureSession alloc] init];
m_sampleBufferDelegate = [[QAVFSampleBufferDelegate alloc]
initWithFrameHandler:[&capture](const QVideoFrame &frame) {
capture.onNewFrame(frame);
}];
m_videoDataOutput = [[AVCaptureVideoDataOutput alloc] init];
NSDictionary *videoSettings = [NSDictionary
dictionaryWithObjectsAndKeys:[NSNumber numberWithUnsignedInt:DefaultCVPixelFormat],
kCVPixelBufferPixelFormatTypeKey, nil];
[m_videoDataOutput setVideoSettings:videoSettings];
[m_videoDataOutput setAlwaysDiscardsLateVideoFrames:true];
// Configure video output
m_dispatchQueue = dispatch_queue_create("vf_queue", nullptr);
[m_videoDataOutput setSampleBufferDelegate:m_sampleBufferDelegate queue:m_dispatchQueue];
[m_captureSession addOutput:m_videoDataOutput];
[m_sampleBufferDelegate setHWAccel:std::move(hwAccel)];
const auto frameRate = std::min(screen->refreshRate(), MaxScreenCaptureFrameRate);
[m_sampleBufferDelegate setVideoFormatFrameRate:frameRate];
m_screenInput = [[AVCaptureScreenInput alloc] initWithDisplayID:screenID];
[m_screenInput setMinFrameDuration:CMTimeMake(1, static_cast<int32_t>(frameRate))];
[m_captureSession addInput:m_screenInput];
[m_captureSession startRunning];
}
~Grabber()
{
if (m_captureSession)
[m_captureSession stopRunning];
if (m_dispatchQueue)
dispatch_release(m_dispatchQueue);
[m_sampleBufferDelegate release];
[m_screenInput release];
[m_videoDataOutput release];
[m_captureSession release];
}
private:
AVCaptureSession *m_captureSession = nullptr;
AVCaptureScreenInput *m_screenInput = nullptr;
AVCaptureVideoDataOutput *m_videoDataOutput = nullptr;
QAVFSampleBufferDelegate *m_sampleBufferDelegate = nullptr;
dispatch_queue_t m_dispatchQueue = nullptr;
};
bool QAVFScreenCapture::initScreenCapture(QScreen *screen)
{
const auto screenID = findDisplayByName(screen->name());
if (screenID == kCGNullDirectDisplay) {
updateError(InternalError, QLatin1String("Screen exists but couldn't been found by name"));
return false;
}
auto hwAccel = QFFmpeg::HWAccel::create(AV_HWDEVICE_TYPE_VIDEOTOOLBOX);
if (!hwAccel) {
updateError(CaptureFailed, QLatin1String("Couldn't create videotoolbox hw acceleration"));
return false;
}
hwAccel->createFramesContext(av_map_videotoolbox_format_to_pixfmt(DefaultCVPixelFormat),
screen->size() * screen->devicePixelRatio());
if (!hwAccel->hwFramesContextAsBuffer()) {
updateError(CaptureFailed, QLatin1String("Couldn't create hw frames context"));
return false;
}
m_grabber = std::make_unique<Grabber>(*this, screen, screenID, std::move(hwAccel));
return true;
}
void QAVFScreenCapture::resetCapture()
{
m_grabber.reset();
m_format = {};
}
QT_END_NAMESPACE
#include "moc_qavfscreencapture_p.cpp"
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