How Can I Programmatically Control Application Volume in Windows Using the Core Audio API?

Windows Application Volume Control: A Practical Guide

Windows offers a built-in Volume Mixer, a graphical interface for managing individual application volumes. This allows for precise control over the audio levels of multiple programs simultaneously.

Core Audio API and Relevant Components

The Volume Mixer leverages the Windows Core Audio API. Key interfaces and classes include:

• IMMDeviceEnumerator: Used to list available audio devices.
• IMMDevice: Represents a single audio device.
• IAudioSessionManager2: Manages audio sessions and provides access to their controls.
• IAudioSessionEnumerator: Lists active audio sessions.
• IAudioSessionControl: Controls an individual audio session.
• ISimpleAudioVolume: Controls volume and mute status for an audio session.

A C# console application example showcasing volume control follows:

<code>...</code>

This code segment demonstrates:

• Retrieval of active audio sessions using IAudioSessionEnumerator.
• Obtaining the ISimpleAudioVolume object for a target application's audio session.
• Muting the application (SetMute(true)) and setting its volume to 50% (SetMasterVolume(50 / 100, ref EventContext)).

This example can be expanded to include functionalities such as unmuting or setting different volume levels.

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