diff --git a/Telegram/CMakeLists.txt b/Telegram/CMakeLists.txt
index 9e1a8a838..3091dbe68 100644
--- a/Telegram/CMakeLists.txt
+++ b/Telegram/CMakeLists.txt
@@ -220,6 +220,7 @@ PRIVATE
     calls/group/calls_choose_join_as.h
     calls/group/calls_group_call.cpp
     calls/group/calls_group_call.h
+    calls/group/calls_group_common.cpp
     calls/group/calls_group_common.h
     calls/group/calls_group_invite_controller.cpp
     calls/group/calls_group_invite_controller.h
diff --git a/Telegram/Resources/langs/lang.strings b/Telegram/Resources/langs/lang.strings
index b5ada1c51..00167d31c 100644
--- a/Telegram/Resources/langs/lang.strings
+++ b/Telegram/Resources/langs/lang.strings
@@ -2009,6 +2009,7 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 
 "lng_call_start_video" = "Start Video";
 "lng_call_stop_video" = "Stop Video";
+"lng_call_screencast" = "Screencast";
 "lng_call_end_call" = "End Call";
 "lng_call_mute_audio" = "Mute";
 "lng_call_unmute_audio" = "Unmute";
diff --git a/Telegram/SourceFiles/calls/calls.style b/Telegram/SourceFiles/calls/calls.style
index 42f93ae7d..f4247f343 100644
--- a/Telegram/SourceFiles/calls/calls.style
+++ b/Telegram/SourceFiles/calls/calls.style
@@ -173,6 +173,24 @@ callCameraUnmute: CallButton(callMicrophoneUnmute) {
 		}
 	}
 }
+callScreencastOn: CallButton(callMicrophoneMute) {
+	button: IconButton(callButton) {
+		icon: icon {{ "calls/calls_present", callIconFg }};
+		iconPosition: point(-1px, 22px);
+		ripple: RippleAnimation(defaultRippleAnimation) {
+			color: callMuteRipple;
+		}
+	}
+}
+callScreencastOff: CallButton(callMicrophoneUnmute) {
+	button: IconButton(callButton) {
+		icon: icon {{ "calls/calls_present", callIconFgActive }};
+		iconPosition: point(-1px, 22px);
+		ripple: RippleAnimation(defaultRippleAnimation) {
+			color: callIconActiveRipple;
+		}
+	}
+}
 callBottomShadowSize: 124px;
 
 CallMuteButton {
diff --git a/Telegram/SourceFiles/calls/calls_call.cpp b/Telegram/SourceFiles/calls/calls_call.cpp
index 41b5beb92..3b2c1ee4e 100644
--- a/Telegram/SourceFiles/calls/calls_call.cpp
+++ b/Telegram/SourceFiles/calls/calls_call.cpp
@@ -290,16 +290,8 @@ void Call::startIncoming() {
 	}).send();
 }
 
-void Call::switchVideoOutgoing() {
-	const auto video = _videoOutgoing->state() == Webrtc::VideoState::Active;
-	_delegate->callRequestPermissionsOrFail(crl::guard(this, [=] {
-		videoOutgoing()->setState(StartVideoState(!video));
-	}), true);
-
-}
-
 void Call::answer() {
-	const auto video = _videoOutgoing->state() == Webrtc::VideoState::Active;
+	const auto video = isSharingVideo();
 	_delegate->callRequestPermissionsOrFail(crl::guard(this, [=] {
 		actuallyAnswer();
 	}), video);
@@ -366,7 +358,9 @@ void Call::setupOutgoingVideo() {
 	}
 	_videoOutgoing->stateValue(
 	) | rpl::start_with_next([=](Webrtc::VideoState state) {
-		if (state != Webrtc::VideoState::Inactive && !hasDevices()) {
+		if (state != Webrtc::VideoState::Inactive
+			&& !hasDevices()
+			&& !_videoCaptureIsScreencast) {
 			_errors.fire({ ErrorType::NoCamera });
 			_videoOutgoing->setState(Webrtc::VideoState::Inactive);
 		} else if (_state.current() != State::Established
@@ -383,7 +377,8 @@ void Call::setupOutgoingVideo() {
 			// Paused not supported right now.
 			Assert(state == Webrtc::VideoState::Active);
 			if (!_videoCapture) {
-				_videoCapture = _delegate->callGetVideoCapture();
+				_videoCapture = _delegate->callGetVideoCapture(
+					_videoCaptureDeviceId);
 				_videoCapture->setOutput(_videoOutgoing->sink());
 			}
 			if (_instance) {
@@ -986,9 +981,12 @@ void Call::setCurrentAudioDevice(bool input, const QString &deviceId) {
 	}
 }
 
-void Call::setCurrentVideoDevice(const QString &deviceId) {
-	if (_videoCapture) {
-		_videoCapture->switchToDevice(deviceId.toStdString());
+void Call::setCurrentCameraDevice(const QString &deviceId) {
+	if (!_videoCaptureIsScreencast) {
+		_videoCaptureDeviceId = deviceId;
+		if (_videoCapture) {
+			_videoCapture->switchToDevice(deviceId.toStdString());
+		}
 	}
 }
 
@@ -1008,6 +1006,71 @@ void Call::setAudioDuckingEnabled(bool enabled) {
 	}
 }
 
+bool Call::isSharingVideo() const {
+	return (_videoOutgoing->state() != Webrtc::VideoState::Inactive);
+}
+
+bool Call::isSharingCamera() const {
+	return !_videoCaptureIsScreencast && isSharingVideo();
+}
+
+bool Call::isSharingScreen() const {
+	return _videoCaptureIsScreencast && isSharingVideo();
+}
+
+QString Call::cameraSharingDeviceId() const {
+	return isSharingCamera() ? _videoCaptureDeviceId : QString();
+}
+
+QString Call::screenSharingDeviceId() const {
+	return isSharingScreen() ? _videoCaptureDeviceId : QString();
+}
+
+void Call::toggleCameraSharing(bool enabled) {
+	if (isSharingCamera() == enabled) {
+		return;
+	} else if (!enabled) {
+		if (_videoCapture) {
+			_videoCapture->setState(tgcalls::VideoState::Inactive);
+		}
+		_videoOutgoing->setState(Webrtc::VideoState::Inactive);
+		_videoCaptureDeviceId = QString();
+		return;
+	}
+	_delegate->callRequestPermissionsOrFail(crl::guard(this, [=] {
+		toggleScreenSharing(std::nullopt);
+		const auto deviceId = Core::App().settings().callVideoInputDeviceId();
+		_videoCaptureDeviceId = deviceId;
+		if (_videoCapture) {
+			_videoCapture->switchToDevice(deviceId.toStdString());
+		}
+		_videoOutgoing->setState(Webrtc::VideoState::Active);
+	}), true);
+}
+
+void Call::toggleScreenSharing(std::optional<QString> uniqueId) {
+	if (!uniqueId) {
+		if (isSharingScreen()) {
+			if (_videoCapture) {
+				_videoCapture->setState(tgcalls::VideoState::Inactive);
+			}
+			_videoOutgoing->setState(Webrtc::VideoState::Inactive);
+		}
+		_videoCaptureDeviceId = QString();
+		_videoCaptureIsScreencast = false;
+		return;
+	} else if (screenSharingDeviceId() == *uniqueId) {
+		return;
+	}
+	toggleCameraSharing(false);
+	_videoCaptureIsScreencast = true;
+	_videoCaptureDeviceId = *uniqueId;
+	if (_videoCapture) {
+		_videoCapture->switchToDevice(uniqueId->toStdString());
+	}
+	_videoOutgoing->setState(Webrtc::VideoState::Active);
+}
+
 void Call::finish(FinishType type, const MTPPhoneCallDiscardReason &reason) {
 	Expects(type != FinishType::None);
 
diff --git a/Telegram/SourceFiles/calls/calls_call.h b/Telegram/SourceFiles/calls/calls_call.h
index fec90fc4a..479c5829a 100644
--- a/Telegram/SourceFiles/calls/calls_call.h
+++ b/Telegram/SourceFiles/calls/calls_call.h
@@ -77,7 +77,7 @@ public:
 			Fn<void()> onSuccess,
 			bool video) = 0;
 
-		virtual auto callGetVideoCapture()
+		virtual auto callGetVideoCapture(const QString &deviceId)
 			-> std::shared_ptr<tgcalls::VideoCaptureInterface> = 0;
 
 		virtual ~Delegate() = default;
@@ -174,7 +174,6 @@ public:
 	crl::time getDurationMs() const;
 	float64 getWaitingSoundPeakValue() const;
 
-	void switchVideoOutgoing();
 	void answer();
 	void hangup();
 	void redial();
@@ -185,10 +184,22 @@ public:
 	QString getDebugLog() const;
 
 	void setCurrentAudioDevice(bool input, const QString &deviceId);
-	void setCurrentVideoDevice(const QString &deviceId);
 	//void setAudioVolume(bool input, float level);
 	void setAudioDuckingEnabled(bool enabled);
 
+	void setCurrentCameraDevice(const QString &deviceId);
+	[[nodiscard]] QString videoDeviceId() const {
+		return _videoCaptureDeviceId;
+	}
+
+	[[nodiscard]] bool isSharingVideo() const;
+	[[nodiscard]] bool isSharingCamera() const;
+	[[nodiscard]] bool isSharingScreen() const;
+	[[nodiscard]] QString cameraSharingDeviceId() const;
+	[[nodiscard]] QString screenSharingDeviceId() const;
+	void toggleCameraSharing(bool enabled);
+	void toggleScreenSharing(std::optional<QString> uniqueId);
+
 	[[nodiscard]] rpl::lifetime &lifetime() {
 		return _lifetime;
 	}
@@ -268,6 +279,8 @@ private:
 
 	std::unique_ptr<tgcalls::Instance> _instance;
 	std::shared_ptr<tgcalls::VideoCaptureInterface> _videoCapture;
+	QString _videoCaptureDeviceId;
+	bool _videoCaptureIsScreencast = false;
 	const std::unique_ptr<Webrtc::VideoTrack> _videoIncoming;
 	const std::unique_ptr<Webrtc::VideoTrack> _videoOutgoing;
 
diff --git a/Telegram/SourceFiles/calls/calls_instance.cpp b/Telegram/SourceFiles/calls/calls_instance.cpp
index a3268fb8d..b32cccbe9 100644
--- a/Telegram/SourceFiles/calls/calls_instance.cpp
+++ b/Telegram/SourceFiles/calls/calls_instance.cpp
@@ -64,7 +64,7 @@ public:
 		Fn<void()> onSuccess,
 		bool video) override;
 	void callPlaySound(CallSound sound) override;
-	auto callGetVideoCapture()
+	auto callGetVideoCapture(const QString &deviceId)
 		-> std::shared_ptr<tgcalls::VideoCaptureInterface> override;
 
 	void groupCallFinished(not_null<GroupCall*> call) override;
@@ -123,9 +123,9 @@ void Instance::Delegate::callPlaySound(CallSound sound) {
 	}());
 }
 
-auto Instance::Delegate::callGetVideoCapture()
+auto Instance::Delegate::callGetVideoCapture(const QString &deviceId)
 -> std::shared_ptr<tgcalls::VideoCaptureInterface> {
-	return _instance->getVideoCapture();
+	return _instance->getVideoCapture(deviceId);
 }
 
 void Instance::Delegate::groupCallFinished(not_null<GroupCall*> call) {
@@ -699,18 +699,22 @@ void Instance::requestPermissionOrFail(Platform::PermissionType type, Fn<void()>
 }
 
 std::shared_ptr<tgcalls::VideoCaptureInterface> Instance::getVideoCapture(
-		QString deviceId) {
-	if (deviceId.isEmpty()) {
-		deviceId = Core::App().settings().callVideoInputDeviceId();
-	}
+		std::optional<QString> deviceId) {
 	if (auto result = _videoCapture.lock()) {
-		result->switchToDevice(deviceId.toStdString());
+		if (deviceId) {
+			result->switchToDevice((deviceId->isEmpty()
+				? Core::App().settings().callVideoInputDeviceId()
+				: *deviceId).toStdString());
+		}
 		return result;
 	}
+	const auto startDeviceId = (deviceId && !deviceId->isEmpty())
+		? *deviceId
+		: Core::App().settings().callVideoInputDeviceId();
 	auto result = std::shared_ptr<tgcalls::VideoCaptureInterface>(
 		tgcalls::VideoCaptureInterface::Create(
 			tgcalls::StaticThreads::getThreads(),
-			deviceId.toStdString()));
+			startDeviceId.toStdString()));
 	_videoCapture = result;
 	return result;
 }
diff --git a/Telegram/SourceFiles/calls/calls_instance.h b/Telegram/SourceFiles/calls/calls_instance.h
index 6ab7e937c..f9604ff48 100644
--- a/Telegram/SourceFiles/calls/calls_instance.h
+++ b/Telegram/SourceFiles/calls/calls_instance.h
@@ -75,7 +75,8 @@ public:
 	bool activateCurrentCall(const QString &joinHash = QString());
 	bool minimizeCurrentActiveCall();
 	bool closeCurrentActiveCall();
-	[[nodiscard]] auto getVideoCapture(QString deviceId = QString())
+	[[nodiscard]] auto getVideoCapture(
+		std::optional<QString> deviceId = std::nullopt)
 		-> std::shared_ptr<tgcalls::VideoCaptureInterface>;
 	void requestPermissionsOrFail(Fn<void()> onSuccess, bool video = true);
 
diff --git a/Telegram/SourceFiles/calls/calls_panel.cpp b/Telegram/SourceFiles/calls/calls_panel.cpp
index 3a1b614c8..03a14e74c 100644
--- a/Telegram/SourceFiles/calls/calls_panel.cpp
+++ b/Telegram/SourceFiles/calls/calls_panel.cpp
@@ -14,6 +14,7 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 #include "data/data_photo_media.h"
 #include "data/data_cloud_file.h"
 #include "data/data_changes.h"
+#include "calls/group/calls_group_common.h"
 #include "calls/calls_emoji_fingerprint.h"
 #include "calls/calls_signal_bars.h"
 #include "calls/calls_userpic.h"
@@ -25,6 +26,8 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 #include "ui/widgets/labels.h"
 #include "ui/widgets/shadow.h"
 #include "ui/widgets/rp_window.h"
+#include "ui/layers/layer_manager.h"
+#include "ui/layers/generic_box.h"
 #include "ui/image/image.h"
 #include "ui/text/format_values.h"
 #include "ui/wrap/fade_wrap.h"
@@ -44,6 +47,7 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 #include "window/main_window.h"
 #include "app.h"
 #include "webrtc/webrtc_video_track.h"
+#include "webrtc/webrtc_media_devices.h"
 #include "styles/style_calls.h"
 #include "styles/style_chat.h"
 
@@ -57,6 +61,7 @@ namespace Calls {
 Panel::Panel(not_null<Call*> call)
 : _call(call)
 , _user(call->user())
+, _layerBg(std::make_unique<Ui::LayerManager>(widget()))
 #ifndef Q_OS_MAC
 , _controls(std::make_unique<Ui::Platform::TitleControls>(
 	widget(),
@@ -67,6 +72,7 @@ Panel::Panel(not_null<Call*> call)
 , _answerHangupRedial(widget(), st::callAnswer, &st::callHangup)
 , _decline(widget(), object_ptr<Ui::CallButton>(widget(), st::callHangup))
 , _cancel(widget(), object_ptr<Ui::CallButton>(widget(), st::callCancel))
+, _screencast(widget(), st::callScreencastOn, &st::callScreencastOff)
 , _camera(widget(), st::callCameraMute, &st::callCameraUnmute)
 , _mute(widget(), st::callMicrophoneMute, &st::callMicrophoneUnmute)
 , _name(widget(), st::callName)
@@ -205,9 +211,28 @@ void Panel::initControls() {
 			_call->setMuted(!_call->muted());
 		}
 	});
+	_screencast->setClickedCallback([=] {
+		if (!_call) {
+			return;
+		} else if (!Webrtc::DesktopCaptureAllowed()) {
+			if (auto box = Group::ScreenSharingPrivacyRequestBox()) {
+				_layerBg->showBox(std::move(box));
+			}
+		} else if (const auto source = Webrtc::UniqueDesktopCaptureSource()) {
+			if (_call->isSharingScreen()) {
+				_call->toggleScreenSharing(std::nullopt);
+			} else {
+				chooseSourceAccepted(*source, false);
+			}
+		} else {
+			Group::Ui::DesktopCapture::ChooseSource(this);
+		}
+	});
 	_camera->setClickedCallback([=] {
-		if (_call) {
-			_call->switchVideoOutgoing();
+		if (!_call) {
+			return;
+		} else {
+			_call->toggleCameraSharing(!_call->isSharingCamera());
 		}
 	});
 
@@ -218,7 +243,8 @@ void Panel::initControls() {
 	});
 	_updateOuterRippleTimer.setCallback([this] {
 		if (_call) {
-			_answerHangupRedial->setOuterValue(_call->getWaitingSoundPeakValue());
+			_answerHangupRedial->setOuterValue(
+				_call->getWaitingSoundPeakValue());
 		} else {
 			_answerHangupRedial->setOuterValue(0.);
 			_updateOuterRippleTimer.cancel();
@@ -260,6 +286,40 @@ void Panel::setIncomingSize(QSize size) {
 	showControls();
 }
 
+QWidget *Panel::chooseSourceParent() {
+	return window().get();
+}
+
+QString Panel::chooseSourceActiveDeviceId() {
+	return _call->screenSharingDeviceId();
+}
+
+bool Panel::chooseSourceActiveWithAudio() {
+	return false;// _call->screenSharingWithAudio();
+}
+
+bool Panel::chooseSourceWithAudioSupported() {
+//#ifdef Q_OS_WIN
+//	return true;
+//#else // Q_OS_WIN
+	return false;
+//#endif // Q_OS_WIN
+}
+
+rpl::lifetime &Panel::chooseSourceInstanceLifetime() {
+	return lifetime();
+}
+
+void Panel::chooseSourceAccepted(
+		const QString &deviceId,
+		bool withAudio) {
+	_call->toggleScreenSharing(deviceId/*, withAudio*/);
+}
+
+void Panel::chooseSourceStop() {
+	_call->toggleScreenSharing(std::nullopt);
+}
+
 void Panel::refreshIncomingGeometry() {
 	Expects(_call != nullptr);
 	Expects(_incoming != nullptr);
@@ -332,12 +392,19 @@ void Panel::reinitWithCall(Call *call) {
 	}, _callLifetime);
 
 	_call->videoOutgoing()->stateValue(
-	) | rpl::start_with_next([=](Webrtc::VideoState state) {
-		const auto active = (state == Webrtc::VideoState::Active);
-		_camera->setProgress(active ? 0. : 1.);
-		_camera->setText(active
-			? tr::lng_call_stop_video()
-			: tr::lng_call_start_video());
+	) | rpl::start_with_next([=] {
+		{
+			const auto active = _call->isSharingCamera();
+			_camera->setProgress(active ? 0. : 1.);
+			_camera->setText(active
+				? tr::lng_call_stop_video()
+				: tr::lng_call_start_video());
+		}
+		{
+			const auto active = _call->isSharingScreen();
+			_screencast->setProgress(active ? 0. : 1.);
+			_screencast->setText(tr::lng_call_screencast());
+		}
 	}, _callLifetime);
 
 	_call->stateValue(
@@ -646,9 +713,11 @@ void Panel::updateControlsGeometry() {
 		updateOutgoingVideoBubbleGeometry();
 	}
 
-	auto bothWidth = _answerHangupRedial->width() + st::callCancel.button.width;
-	_decline->moveToLeft((widget()->width() - bothWidth) / 2, _buttonsTop);
-	_cancel->moveToLeft((widget()->width() - bothWidth) / 2, _buttonsTop);
+	auto threeWidth = _answerHangupRedial->width()
+		+ st::callCancel.button.width
+		- _screencast->width();
+	_decline->moveToLeft((widget()->width() - threeWidth) / 2, _buttonsTop);
+	_cancel->moveToLeft((widget()->width() - threeWidth) / 2, _buttonsTop);
 
 	updateHangupGeometry();
 }
@@ -670,16 +739,19 @@ void Panel::updateOutgoingVideoBubbleGeometry() {
 }
 
 void Panel::updateHangupGeometry() {
-	auto singleWidth = _answerHangupRedial->width();
-	auto bothWidth = singleWidth + st::callCancel.button.width;
-	auto rightFrom = (widget()->width() - bothWidth) / 2;
-	auto rightTo = (widget()->width() - singleWidth) / 2;
+	auto twoWidth = _answerHangupRedial->width() + _screencast->width();
+	auto threeWidth = twoWidth + st::callCancel.button.width;
+	auto rightFrom = (widget()->width() - threeWidth) / 2;
+	auto rightTo = (widget()->width() - twoWidth) / 2;
 	auto hangupProgress = _hangupShownProgress.value(_hangupShown ? 1. : 0.);
 	auto hangupRight = anim::interpolate(rightFrom, rightTo, hangupProgress);
 	_answerHangupRedial->moveToRight(hangupRight, _buttonsTop);
 	_answerHangupRedial->setProgress(hangupProgress);
 	_mute->moveToRight(hangupRight - _mute->width(), _buttonsTop);
-	_camera->moveToLeft(hangupRight - _mute->width(), _buttonsTop);
+	_screencast->moveToLeft(hangupRight - _mute->width(), _buttonsTop);
+	_camera->moveToLeft(
+		hangupRight - _mute->width() + _screencast->width(),
+		_buttonsTop);
 }
 
 void Panel::updateStatusGeometry() {
diff --git a/Telegram/SourceFiles/calls/calls_panel.h b/Telegram/SourceFiles/calls/calls_panel.h
index 476619f8b..adff466b9 100644
--- a/Telegram/SourceFiles/calls/calls_panel.h
+++ b/Telegram/SourceFiles/calls/calls_panel.h
@@ -11,6 +11,7 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 #include "base/timer.h"
 #include "base/object_ptr.h"
 #include "calls/calls_call.h"
+#include "calls/group/ui/desktop_capture_choose_source.h"
 #include "ui/effects/animations.h"
 #include "ui/gl/gl_window.h"
 #include "ui/rp_widget.h"
@@ -25,6 +26,7 @@ class CloudImageView;
 namespace Ui {
 class IconButton;
 class CallButton;
+class LayerManager;
 class FlatLabel;
 template <typename Widget>
 class FadeWrap;
@@ -50,7 +52,7 @@ class Userpic;
 class SignalBars;
 class VideoBubble;
 
-class Panel final {
+class Panel final : private Group::Ui::DesktopCapture::ChooseSourceDelegate {
 public:
 	Panel(not_null<Call*> call);
 	~Panel();
@@ -61,7 +63,17 @@ public:
 	void replaceCall(not_null<Call*> call);
 	void closeBeforeDestroy();
 
-	rpl::lifetime &lifetime();
+	QWidget *chooseSourceParent() override;
+	QString chooseSourceActiveDeviceId() override;
+	bool chooseSourceActiveWithAudio() override;
+	bool chooseSourceWithAudioSupported() override;
+	rpl::lifetime &chooseSourceInstanceLifetime() override;
+	void chooseSourceAccepted(
+		const QString &deviceId,
+		bool withAudio) override;
+	void chooseSourceStop() override;
+
+	[[nodiscard]] rpl::lifetime &lifetime();
 
 private:
 	class Incoming;
@@ -110,6 +122,7 @@ private:
 	not_null<UserData*> _user;
 
 	Ui::GL::Window _window;
+	const std::unique_ptr<Ui::LayerManager> _layerBg;
 	std::unique_ptr<Incoming> _incoming;
 
 #ifndef Q_OS_MAC
@@ -128,6 +141,7 @@ private:
 	bool _outgoingPreviewInBody = false;
 	std::optional<AnswerHangupRedialState> _answerHangupRedialState;
 	Ui::Animations::Simple _hangupShownProgress;
+	object_ptr<Ui::CallButton> _screencast;
 	object_ptr<Ui::CallButton> _camera;
 	object_ptr<Ui::CallButton> _mute;
 	object_ptr<Ui::FlatLabel> _name;
diff --git a/Telegram/SourceFiles/calls/group/calls_group_call.cpp b/Telegram/SourceFiles/calls/group/calls_group_call.cpp
index 9b9e9a5ad..e861e87fe 100644
--- a/Telegram/SourceFiles/calls/group/calls_group_call.cpp
+++ b/Telegram/SourceFiles/calls/group/calls_group_call.cpp
@@ -3049,10 +3049,6 @@ void GroupCall::setCurrentAudioDevice(bool input, const QString &deviceId) {
 	}
 }
 
-void GroupCall::setCurrentVideoDevice(const QString &deviceId) {
-	_mediaDevices->switchToVideoInput(deviceId);
-}
-
 void GroupCall::toggleMute(const Group::MuteRequest &data) {
 	if (data.locallyOnly) {
 		applyParticipantLocally(data.peer, data.mute, std::nullopt);
diff --git a/Telegram/SourceFiles/calls/group/calls_group_call.h b/Telegram/SourceFiles/calls/group/calls_group_call.h
index a4a06923b..4e8f59f71 100644
--- a/Telegram/SourceFiles/calls/group/calls_group_call.h
+++ b/Telegram/SourceFiles/calls/group/calls_group_call.h
@@ -370,7 +370,6 @@ public:
 	}
 
 	void setCurrentAudioDevice(bool input, const QString &deviceId);
-	void setCurrentVideoDevice(const QString &deviceId);
 	[[nodiscard]] bool isSharingScreen() const;
 	[[nodiscard]] rpl::producer<bool> isSharingScreenValue() const;
 	[[nodiscard]] bool isScreenPaused() const;
diff --git a/Telegram/SourceFiles/calls/group/calls_group_common.cpp b/Telegram/SourceFiles/calls/group/calls_group_common.cpp
new file mode 100644
index 000000000..62d1da46e
--- /dev/null
+++ b/Telegram/SourceFiles/calls/group/calls_group_common.cpp
@@ -0,0 +1,54 @@
+/*
+This file is part of Telegram Desktop,
+the official desktop application for the Telegram messaging service.
+
+For license and copyright information please follow this link:
+https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
+*/
+#include "calls/group/calls_group_common.h"
+
+#include "base/platform/base_platform_info.h"
+#include "ui/widgets/labels.h"
+#include "ui/layers/generic_box.h"
+#include "ui/text/text_utilities.h"
+#include "lang/lang_keys.h"
+#include "styles/style_layers.h"
+#include "styles/style_calls.h"
+
+namespace Calls::Group {
+
+object_ptr<Ui::GenericBox> ScreenSharingPrivacyRequestBox() {
+#ifndef Q_OS_MAC
+	if (!Platform::IsMac10_15OrGreater()) {
+		return { nullptr };
+	}
+	const auto requestInputMonitoring = Platform::IsMac10_15OrGreater();
+	return Box([=](not_null<Ui::GenericBox*> box) {
+		box->addRow(
+			object_ptr<Ui::FlatLabel>(
+				box.get(),
+				rpl::combine(
+					tr::lng_group_call_mac_screencast_access(),
+					tr::lng_group_call_mac_recording()
+				) | rpl::map([](QString a, QString b) {
+					auto result = Ui::Text::RichLangValue(a);
+					result.append("\n\n").append(Ui::Text::RichLangValue(b));
+					return result;
+				}),
+				st::groupCallBoxLabel),
+			style::margins(
+				st::boxRowPadding.left(),
+				st::boxPadding.top(),
+				st::boxRowPadding.right(),
+				st::boxPadding.bottom()));
+		box->addButton(tr::lng_group_call_mac_settings(), [=] {
+			//Platform::OpenDesktopCapturePrivacySettings();
+		});
+		box->addButton(tr::lng_cancel(), [=] { box->closeBox(); });
+	});
+#else // Q_OS_MAC
+	return { nullptr };
+#endif // Q_OS_MAC
+}
+
+} // namespace Calls::Group
diff --git a/Telegram/SourceFiles/calls/group/calls_group_common.h b/Telegram/SourceFiles/calls/group/calls_group_common.h
index ce84f94ef..8ab37b978 100644
--- a/Telegram/SourceFiles/calls/group/calls_group_common.h
+++ b/Telegram/SourceFiles/calls/group/calls_group_common.h
@@ -7,8 +7,14 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 */
 #pragma once
 
+#include "base/object_ptr.h"
+
 class UserData;
 
+namespace Ui {
+class GenericBox;
+} // namespace Ui
+
 namespace Calls::Group {
 
 constexpr auto kDefaultVolume = 10000;
@@ -78,4 +84,6 @@ constexpr inline bool is_flag_type(StickedTooltip) {
 }
 using StickedTooltips = base::flags<StickedTooltip>;
 
+[[nodiscard]] object_ptr<Ui::GenericBox> ScreenSharingPrivacyRequestBox();
+
 } // namespace Calls::Group
diff --git a/Telegram/SourceFiles/calls/group/calls_group_panel.cpp b/Telegram/SourceFiles/calls/group/calls_group_panel.cpp
index 7b680cd86..3f3d431c1 100644
--- a/Telegram/SourceFiles/calls/group/calls_group_panel.cpp
+++ b/Telegram/SourceFiles/calls/group/calls_group_panel.cpp
@@ -70,10 +70,6 @@ constexpr auto kRecordingOpacity = 0.6;
 constexpr auto kStartNoConfirmation = TimeId(10);
 constexpr auto kControlsBackgroundOpacity = 0.8;
 constexpr auto kOverrideActiveColorBgAlpha = 172;
-constexpr auto kMicrophoneTooltipAfterLoudCount = 3;
-constexpr auto kDropLoudAfterQuietCount = 5;
-constexpr auto kMicrophoneTooltipLevelThreshold = 0.2;
-constexpr auto kMicrophoneTooltipCheckInterval = crl::time(500);
 
 } // namespace
 
@@ -87,49 +83,6 @@ struct Panel::ControlsBackgroundNarrow {
 	Ui::RpWidget blocker;
 };
 
-class Panel::MicLevelTester final {
-public:
-	explicit MicLevelTester(Fn<void()> show);
-
-	[[nodiscard]] bool showTooltip() const;
-
-private:
-	void check();
-
-	Fn<void()> _show;
-	base::Timer _timer;
-	Webrtc::AudioInputTester _tester;
-	int _loudCount = 0;
-	int _quietCount = 0;
-
-};
-
-Panel::MicLevelTester::MicLevelTester(Fn<void()> show)
-: _show(std::move(show))
-, _timer([=] { check(); })
-, _tester(
-		Core::App().settings().callAudioBackend(),
-		Core::App().settings().callInputDeviceId()) {
-	_timer.callEach(kMicrophoneTooltipCheckInterval);
-}
-
-bool Panel::MicLevelTester::showTooltip() const {
-	return (_loudCount >= kMicrophoneTooltipAfterLoudCount);
-}
-
-void Panel::MicLevelTester::check() {
-	const auto level = _tester.getAndResetLevel();
-	if (level >= kMicrophoneTooltipLevelThreshold) {
-		_quietCount = 0;
-		if (++_loudCount >= kMicrophoneTooltipAfterLoudCount) {
-			_show();
-		}
-	} else if (_loudCount > 0 && ++_quietCount >= kDropLoudAfterQuietCount) {
-		_quietCount = 0;
-		_loudCount = 0;
-	}
-}
-
 Panel::Panel(not_null<GroupCall*> call)
 : _call(call)
 , _peer(call->peer())
@@ -1155,35 +1108,9 @@ void Panel::refreshTopButton() {
 }
 
 void Panel::screenSharingPrivacyRequest() {
-#ifdef Q_OS_MAC
-	if (!Platform::IsMac10_15OrGreater()) {
-		return;
+	if (auto box = ScreenSharingPrivacyRequestBox()) {
+		_layerBg->showBox(std::move(box));
 	}
-	const auto requestInputMonitoring = Platform::IsMac10_15OrGreater();
-	_layerBg->showBox(Box([=](not_null<Ui::GenericBox*> box) {
-		box->addRow(
-			object_ptr<Ui::FlatLabel>(
-				box.get(),
-				rpl::combine(
-					tr::lng_group_call_mac_screencast_access(),
-					tr::lng_group_call_mac_recording()
-				) | rpl::map([](QString a, QString b) {
-					auto result = Ui::Text::RichLangValue(a);
-					result.append("\n\n").append(Ui::Text::RichLangValue(b));
-					return result;
-				}),
-				st::groupCallBoxLabel),
-			style::margins(
-				st::boxRowPadding.left(),
-				st::boxPadding.top(),
-				st::boxRowPadding.right(),
-				st::boxPadding.bottom()));
-		box->addButton(tr::lng_group_call_mac_settings(), [=] {
-			Platform::OpenDesktopCapturePrivacySettings();
-		});
-		box->addButton(tr::lng_cancel(), [=] { box->closeBox(); });
-	}));
-#endif // Q_OS_MAC
 }
 
 void Panel::chooseShareScreenSource() {
diff --git a/Telegram/SourceFiles/calls/group/calls_group_panel.h b/Telegram/SourceFiles/calls/group/calls_group_panel.h
index 0d2cd6f4a..75bac4aa0 100644
--- a/Telegram/SourceFiles/calls/group/calls_group_panel.h
+++ b/Telegram/SourceFiles/calls/group/calls_group_panel.h
@@ -63,6 +63,7 @@ class Members;
 class Viewport;
 enum class PanelMode;
 enum class StickedTooltip;
+class MicLevelTester;
 
 class Panel final : private Ui::DesktopCapture::ChooseSourceDelegate {
 public:
@@ -94,7 +95,6 @@ private:
 		Activated,
 		Discarded,
 	};
-	class MicLevelTester;
 
 	[[nodiscard]] not_null<Ui::RpWindow*> window() const;
 	[[nodiscard]] not_null<Ui::RpWidget*> widget() const;
diff --git a/Telegram/SourceFiles/calls/group/calls_group_settings.cpp b/Telegram/SourceFiles/calls/group/calls_group_settings.cpp
index 19f3f37bb..62cac5a79 100644
--- a/Telegram/SourceFiles/calls/group/calls_group_settings.cpp
+++ b/Telegram/SourceFiles/calls/group/calls_group_settings.cpp
@@ -53,6 +53,10 @@ namespace Calls::Group {
 namespace {
 
 constexpr auto kDelaysCount = 201;
+constexpr auto kMicrophoneTooltipAfterLoudCount = 3;
+constexpr auto kDropLoudAfterQuietCount = 5;
+constexpr auto kMicrophoneTooltipLevelThreshold = 0.2;
+constexpr auto kMicrophoneTooltipCheckInterval = crl::time(500);
 
 #ifdef Q_OS_MAC
 constexpr auto kCheckAccessibilityInterval = crl::time(500);
@@ -735,4 +739,31 @@ std::pair<Fn<void()>, rpl::lifetime> ShareInviteLinkAction(
 	return { std::move(callback), std::move(lifetime) };
 }
 
+MicLevelTester::MicLevelTester(Fn<void()> show)
+: _show(std::move(show))
+, _timer([=] { check(); })
+, _tester(
+	std::make_unique<Webrtc::AudioInputTester>(
+		Core::App().settings().callAudioBackend(),
+		Core::App().settings().callInputDeviceId())) {
+	_timer.callEach(kMicrophoneTooltipCheckInterval);
+}
+
+bool MicLevelTester::showTooltip() const {
+	return (_loudCount >= kMicrophoneTooltipAfterLoudCount);
+}
+
+void MicLevelTester::check() {
+	const auto level = _tester->getAndResetLevel();
+	if (level >= kMicrophoneTooltipLevelThreshold) {
+		_quietCount = 0;
+		if (++_loudCount >= kMicrophoneTooltipAfterLoudCount) {
+			_show();
+		}
+	} else if (_loudCount > 0 && ++_quietCount >= kDropLoudAfterQuietCount) {
+		_quietCount = 0;
+		_loudCount = 0;
+	}
+}
+
 } // namespace Calls::Group
diff --git a/Telegram/SourceFiles/calls/group/calls_group_settings.h b/Telegram/SourceFiles/calls/group/calls_group_settings.h
index 744b8fc50..a4a829e90 100644
--- a/Telegram/SourceFiles/calls/group/calls_group_settings.h
+++ b/Telegram/SourceFiles/calls/group/calls_group_settings.h
@@ -9,6 +9,10 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 
 #include "ui/layers/generic_box.h"
 
+namespace Webrtc {
+class AudioInputTester;
+} // namespace Webrtc
+
 namespace Calls {
 class GroupCall;
 } // namespace Calls
@@ -24,4 +28,21 @@ void SettingsBox(
 	Fn<void(object_ptr<Ui::BoxContent>)> showBox,
 	Fn<void(QString)> showToast);
 
+class MicLevelTester final {
+public:
+	explicit MicLevelTester(Fn<void()> show);
+
+	[[nodiscard]] bool showTooltip() const;
+
+private:
+	void check();
+
+	Fn<void()> _show;
+	base::Timer _timer;
+	std::unique_ptr<Webrtc::AudioInputTester> _tester;
+	int _loudCount = 0;
+	int _quietCount = 0;
+
+};
+
 } // namespace Calls::Group
diff --git a/Telegram/SourceFiles/calls/group/ui/desktop_capture_choose_source.cpp b/Telegram/SourceFiles/calls/group/ui/desktop_capture_choose_source.cpp
index 5fef0ff2e..a39e5ca45 100644
--- a/Telegram/SourceFiles/calls/group/ui/desktop_capture_choose_source.cpp
+++ b/Telegram/SourceFiles/calls/group/ui/desktop_capture_choose_source.cpp
@@ -423,7 +423,7 @@ void ChooseSourceProcess::setupPanel() {
 			+ rows * st::desktopCaptureSourceSize.height()
 			+ (rows - 1) * skips.height()
 			+ margins.bottom();
-		_inner->resize(width, std::max(height, innerHeight));
+		_inner->resize(width, innerHeight);
 	}, _inner->lifetime());
 
 	if (const auto parent = _delegate->chooseSourceParent()) {
diff --git a/Telegram/SourceFiles/settings/settings_calls.cpp b/Telegram/SourceFiles/settings/settings_calls.cpp
index 68b607344..77b17ebf2 100644
--- a/Telegram/SourceFiles/settings/settings_calls.cpp
+++ b/Telegram/SourceFiles/settings/settings_calls.cpp
@@ -69,9 +69,9 @@ void Calls::setupContent() {
 	if (!cameras.empty()) {
 		const auto hasCall = (Core::App().calls().currentCall() != nullptr);
 
-		auto capturerOwner = Core::App().calls().getVideoCapture();
-		const auto capturer = capturerOwner.get();
-		content->lifetime().add([owner = std::move(capturerOwner)]{});
+		auto capturerOwner = content->lifetime().make_state<
+			std::shared_ptr<tgcalls::VideoCaptureInterface>
+		>();
 
 		const auto track = content->lifetime().make_state<VideoTrack>(
 			(hasCall
@@ -102,7 +102,8 @@ void Calls::setupContent() {
 		)->addClickHandler([=] {
 			const auto &devices = GetVideoInputList();
 			const auto options = ranges::views::concat(
-				ranges::views::single(tr::lng_settings_call_device_default(tr::now)),
+				ranges::views::single(
+					tr::lng_settings_call_device_default(tr::now)),
 				devices | ranges::views::transform(&VideoInput::name)
 			) | ranges::to_vector;
 			const auto i = ranges::find(
@@ -117,11 +118,13 @@ void Calls::setupContent() {
 				const auto deviceId = option
 					? devices[option - 1].id
 					: "default";
-				capturer->switchToDevice(deviceId.toStdString());
 				Core::App().settings().setCallVideoInputDeviceId(deviceId);
 				Core::App().saveSettingsDelayed();
 				if (const auto call = Core::App().calls().currentCall()) {
-					call->setCurrentVideoDevice(deviceId);
+					call->setCurrentCameraDevice(deviceId);
+				}
+				if (*capturerOwner) {
+					(*capturerOwner)->switchToDevice(deviceId.toStdString());
 				}
 			});
 			_controller->show(Box([=](not_null<Ui::GenericBox*> box) {
@@ -169,6 +172,19 @@ void Calls::setupContent() {
 		}, bubbleWrap->lifetime());
 
 		using namespace rpl::mappers;
+		const auto checkCapturer = [=] {
+			if (*capturerOwner
+				|| Core::App().calls().currentCall()
+				|| Core::App().calls().currentGroupCall()) {
+				return;
+			}
+			*capturerOwner = Core::App().calls().getVideoCapture(
+				Core::App().settings().callVideoInputDeviceId());
+			(*capturerOwner)->setPreferredAspectRatio(0.);
+			track->setState(VideoState::Active);
+			(*capturerOwner)->setState(tgcalls::VideoState::Active);
+			(*capturerOwner)->setOutput(track->sink());
+		};
 		rpl::combine(
 			Core::App().calls().currentCallValue(),
 			Core::App().calls().currentGroupCallValue(),
@@ -177,10 +193,9 @@ void Calls::setupContent() {
 			if (has) {
 				track->setState(VideoState::Inactive);
 				bubbleWrap->resize(bubbleWrap->width(), 0);
+				*capturerOwner = nullptr;
 			} else {
-				capturer->setPreferredAspectRatio(0.);
-				track->setState(VideoState::Active);
-				capturer->setOutput(track->sink());
+				crl::on_main(content, checkCapturer);
 			}
 		}, content->lifetime());
 
diff --git a/Telegram/lib_ui b/Telegram/lib_ui
index d452ae8ba..868f2671f 160000
--- a/Telegram/lib_ui
+++ b/Telegram/lib_ui
@@ -1 +1 @@
-Subproject commit d452ae8ba6fcfc83accb6a1213a15d3e3a301740
+Subproject commit 868f2671fa9f0bf180eef0795d5c31d4ee4e3770