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Telegram/lib_webrtc/webrtc/webrtc_device_resolver.h

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+// This file is part of Desktop App Toolkit,
+// a set of libraries for developing nice desktop applications.
+//
+// For license and copyright information please follow this link:
+// https://github.com/desktop-app/legal/blob/master/LEGAL
+//
+#pragma once
+
+#include "base/qt/qt_compare.h"
+#include "webrtc/webrtc_device_common.h"
+
+#include <QtCore/QMutex>
+
+namespace Webrtc {
+
+class Environment;
+
+class DeviceResolver final {
+public:
+	DeviceResolver(
+		not_null<Environment*> environment,
+		DeviceType type,
+		rpl::producer<QString> savedValue);
+
+	[[nodiscard]] DeviceResolvedId current() const;
+	[[nodiscard]] rpl::producer<DeviceResolvedId> value() const;
+	[[nodiscard]] rpl::producer<DeviceResolvedId> changes() const;
+
+	[[nodiscard]] DeviceResolvedId threadSafeCurrent() const;
+
+	[[nodiscard]] DeviceChangeReason lastChangeReason() const;
+
+private:
+	void trackSavedId();
+
+	const not_null<Environment*> _environment;
+	QString _savedId;
+	DeviceResolvedId _current;
+	mutable QMutex _mutex;
+	rpl::variable<DeviceResolvedId> _data;
+	DeviceChangeReason _lastChangeReason = DeviceChangeReason::Manual;
+	rpl::lifetime _lifetime;
+
+};
+
+[[nodiscard]] rpl::producer<QString> DeviceIdOrDefault(
+	rpl::producer<QString> id);
+
+[[nodiscard]] rpl::producer<QString> DeviceIdValueWithFallback(
+	rpl::producer<QString> id,
+	rpl::producer<QString> fallback);
+
+} // namespace Webrtc