How Can I Programmatically Control Application Volume in Windows?

Automating Application Volume Control in Windows

Need to control individual application volumes in Windows programmatically? While the standard Volume Mixer is user-friendly, repeated adjustments can be inefficient. This article demonstrates how to leverage the Windows Core Audio API to manage application volume levels directly through code.

A C# console application example is provided, showcasing the following functionalities:

• Checking application mute status
• Retrieving current application volume
• Muting/unmuting applications
• Setting precise application volume levels

The application iterates through currently running processes. It identifies the target application based on its name and then applies the specified volume modifications.

Understanding the Windows Core Audio API

The Windows Core Audio API offers COM interfaces for interacting with audio devices and streams. Key interfaces used in this example include:

• IMMDeviceEnumerator: Enumerates available audio devices.
• IMMDevice: Represents a single audio device.
• IAudioSessionManager2: Manages audio sessions.
• IAudioSessionEnumerator: Enumerates active audio sessions.
• IAudioSessionControl: Represents an individual audio session.
• ISimpleAudioVolume: Controls the volume of an audio session.

Running the Application

Compile and execute the provided C# console application to observe the volume and mute status of the target application, and to adjust these settings as needed. Remember that this functionality is supported on Windows 7 and later versions.

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