Check confcall size limit.

Telegram/Resources/langs/lang.strings

@@ -4959,6 +4959,7 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 "lng_confcall_invite_kicked_many#one" = "**{count} person** was removed from the call.";
 "lng_confcall_invite_kicked_many#other" = "**{count} people** were removed from the call.";
 "lng_confcall_not_accessible" = "This call is no longer accessible.";
+"lng_confcall_participants_limit" = "This call reached the participants limit.";
 
 "lng_no_mic_permission" = "Telegram needs microphone access so that you can make calls and record voice messages.";
 

Telegram/SourceFiles/calls/group/calls_group_common.cpp

@@ -97,7 +97,7 @@ void ConferenceCallJoinConfirm(
 		not_null<Ui::GenericBox*> box,
 		std::shared_ptr<Data::GroupCall> call,
 		UserData *maybeInviter,
-		Fn<void()> join) {
+		Fn<void(Fn<void()> close)> join) {
 	box->setStyle(st::confcallJoinBox);
 	box->setWidth(st::boxWideWidth);
 	box->setNoContentMargin(true);
@@ -223,11 +223,11 @@ void ConferenceCallJoinConfirm(
 		)->setTryMakeSimilarLines(true);
 	}
 	const auto joinAndClose = [=] {
-		const auto weak = Ui::MakeWeak(box);
-		join();
-		if (const auto strong = weak.data()) {
-			strong->closeBox();
-		}
+		join([weak = Ui::MakeWeak(box)] {
+			if (const auto strong = weak.data()) {
+				strong->closeBox();
+			}
+		});
 	};
 	Info::BotStarRef::AddFullWidthButton(
 		box,

Telegram/SourceFiles/calls/group/calls_group_common.h

@@ -163,7 +163,7 @@ void ConferenceCallJoinConfirm(
 	not_null<Ui::GenericBox*> box,
 	std::shared_ptr<Data::GroupCall> call,
 	UserData *maybeInviter,
-	Fn<void()> join);
+	Fn<void(Fn<void()> close)> join);
 
 struct ConferenceCallLinkStyleOverrides {
 	const style::Box *box = nullptr;

Telegram/SourceFiles/calls/group/calls_group_invite_controller.cpp

@@ -18,8 +18,9 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 #include "data/data_session.h"
 #include "data/data_group_call.h"
 #include "info/profile/info_profile_icon.h"
-#include "main/main_session.h"
 #include "main/session/session_show.h"
+#include "main/main_app_config.h"
+#include "main/main_session.h"
 #include "ui/effects/ripple_animation.h"
 #include "ui/text/text_utilities.h"
 #include "ui/layers/generic_box.h"
@@ -306,8 +307,8 @@ void ConfInviteController::toggleRowSelected(
 		not_null<PeerListRow*> row,
 		bool video) {
 	auto count = fullCount();
-	auto limit = Data::kMaxConferenceMembers;
-	if (count < limit || row->checked()) {
+	const auto conferenceLimit = session().appConfig().confcallSizeLimit();
+	if (count < conferenceLimit || row->checked()) {
 		const auto real = static_cast<ConfInviteRow*>(row.get());
 		if (!row->checked()) {
 			real->setVideo(video);

Telegram/SourceFiles/calls/group/calls_group_panel.cpp

@@ -48,6 +48,7 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 #include "data/data_session.h"
 #include "data/data_changes.h"
 #include "main/session/session_show.h"
+#include "main/main_app_config.h"
 #include "main/main_session.h"
 #include "base/event_filter.h"
 #include "base/unixtime.h"
@@ -1569,8 +1570,10 @@ void Panel::showMainMenu() {
 }
 
 void Panel::addMembers() {
+	const auto &appConfig = _call->peer()->session().appConfig();
+	const auto conferenceLimit = appConfig.confcallSizeLimit();
 	if (_call->conference()
-		&& _call->conferenceCall()->fullCount() >= Data::kMaxConferenceMembers) {
+		&& _call->conferenceCall()->fullCount() >= conferenceLimit) {
 		showToast({ tr::lng_group_call_invite_limit(tr::now) });
 	}
 	const auto showToastCallback = [=](TextWithEntities &&text) {

Telegram/SourceFiles/data/data_group_call.h

@@ -30,8 +30,6 @@ namespace Data {
 
 [[nodiscard]] const std::string &RtmpEndpointId();
 
-inline constexpr auto kMaxConferenceMembers = 200;
-
 struct LastSpokeTimes {
 	crl::time anything = 0;
 	crl::time voice = 0;

Telegram/SourceFiles/main/main_app_config.cpp

@@ -108,9 +108,16 @@ int AppConfig::pinnedGiftsLimit() const {
 	return get<int>(u"stargifts_pinned_to_top_limit"_q, 6);
 }
 
+int AppConfig::confcallSizeLimit() const {
+	return get<int>(
+		u"conference_call_size_limit"_q,
+		_account->mtp().isTestMode() ? 5 : 100);
+}
+
 bool AppConfig::confcallPrioritizeVP8() const {
 	AssertIsDebug();
 	return true;
+	return get<bool>(u"confcall_use_vp8"_q, false);
 }
 
 void AppConfig::refresh(bool force) {

Telegram/SourceFiles/main/main_app_config.h

@@ -79,6 +79,7 @@ public:
 
 	[[nodiscard]] int pinnedGiftsLimit() const;
 
+	[[nodiscard]] int confcallSizeLimit() const;
 	[[nodiscard]] bool confcallPrioritizeVP8() const;
 
 	void refresh(bool force = false);

Telegram/SourceFiles/window/window_session_controller.cpp

@@ -881,12 +881,19 @@ void SessionNavigation::resolveConferenceCall(
 				data.vid().v,
 				data.vaccess_hash().v);
 			call->processFullCall(result);
-			const auto join = [=] {
-				Core::App().calls().startOrJoinConferenceCall({
-					.call = call,
-					.linkSlug = slug,
-					.joinMessageId = inviteMsgId,
-				});
+			const auto join = [=](Fn<void()> close) {
+				const auto &appConfig = call->peer()->session().appConfig();
+				const auto conferenceLimit = appConfig.confcallSizeLimit();
+				if (call->fullCount() >= conferenceLimit) {
+					showToast(tr::lng_confcall_participants_limit(tr::now));
+				} else {
+					Core::App().calls().startOrJoinConferenceCall({
+						.call = call,
+						.linkSlug = slug,
+						.joinMessageId = inviteMsgId,
+					});
+					close();
+				}
 			};
 			const auto context = session().data().message(contextId);
 			const auto inviter = context