Restore SEBPatch

SafeExamBrowser.SystemComponents.Contracts/Audio/Events/VolumeChangedEventHandler.cs

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+/*
+ * Copyright (c) 2024 ETH Zürich, IT Services
+ * 
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+namespace SafeExamBrowser.SystemComponents.Contracts.Audio.Events
+{
+	/// <summary>
+	/// Indicates that the volume of the system audio component has changed.
+	/// </summary>
+	public delegate void VolumeChangedEventHandler(double volume, bool muted);
+}

SafeExamBrowser.SystemComponents.Contracts/Audio/IAudio.cs

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+/*
+ * Copyright (c) 2024 ETH Zürich, IT Services
+ * 
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+using SafeExamBrowser.SystemComponents.Contracts.Audio.Events;
+
+namespace SafeExamBrowser.SystemComponents.Contracts.Audio
+{
+	/// <summary>
+	/// Defines the functionality of the audio system component.
+	/// </summary>
+	public interface IAudio : ISystemComponent
+	{
+		/// <summary>
+		/// The full name of the audio device, or an empty string if not available.
+		/// </summary>
+		string DeviceFullName { get; }
+
+		/// <summary>
+		/// The short audio device name, or an empty string if not available.
+		/// </summary>
+		string DeviceShortName { get; }
+
+		/// <summary>
+		/// Indicates whether an audio output device is available.
+		/// </summary>
+		bool HasOutputDevice { get; }
+
+		/// <summary>
+		/// Indicates whether the audio output is currently muted.
+		/// </summary>
+		bool OutputMuted { get; }
+
+		/// <summary>
+		/// The current audio output volume.
+		/// </summary>
+		double OutputVolume { get; }
+
+		/// <summary>
+		/// Fired when the volume of the audio device has changed.
+		/// </summary>
+		event VolumeChangedEventHandler VolumeChanged;
+
+		/// <summary>
+		/// Mutes the currently active audio device.
+		/// </summary>
+		void Mute();
+
+		/// <summary>
+		/// Unmutes the currently active audio device.
+		/// </summary>
+		void Unmute();
+
+		/// <summary>
+		/// Sets the volume of the currently active audio device to the given value.
+		/// </summary>
+		void SetVolume(double value);
+	}
+}