EonaCat.VolumeMixer

The EonaCat.VolumeMixer library provides an interface to interact with individual audio sessions on Windows. It allows you to retrieve and modify the volume and mute state of a session, get session metadata, and access information about the associated process.

This class uses Windows Core Audio APIs via COM interop to manage audio sessions, making it suitable for applications that need fine-grained control over audio streams per process or session.

Features

• Get and set audio session volume asynchronously
• Get and set mute state asynchronously
• Retrieve session metadata such as display name, icon path, process ID, and state
• Get the name of the process owning the session
• Thread-safe operations with internal synchronization
• Proper cleanup of COM resources through implementation of IDisposable

Note

Volume and mute setters are asynchronous and include retry logic for reliability. Volume values must be between 0.0 (silent) and 1.0 (max volume). Getting process name returns "Unknown" if the process cannot be found. Thread-safe for concurrent use. Requires Windows Vista or later with Core Audio APIs.

Dependencies

Must be run with permissions that allow access to audio session interfaces.

Accessing session state:

using EonaCat.VolumeMixer;

IAudioSessionControlExtended sessionControl = /* obtained from enumerator */;
IAudioSessionManager sessionManager = /* obtained from audio device */;
var audioSession = new AudioSession(sessionControl, sessionManager);
string displayName = audioSession.DisplayName;
string iconPath = audioSession.IconPath;
uint processId = audioSession.ProcessId;
AudioSessionState state = audioSession.State;

Obtaining current volume and mute state:

// Get current volume (0.0 to 1.0)
float volume = audioSession.GetVolume();

// Set volume asynchronously
bool success = await audioSession.SetVolumeAsync(0.75f);
if (success)
{
    Console.WriteLine("Volume set successfully");
}
else
{
    Console.WriteLine("Failed to set volume");
}

Mute control:

// Get mute status
bool isMuted = audioSession.GetMute();

// Set mute asynchronously
bool muteSuccess = await audioSession.SetMuteAsync(true);
if (muteSuccess)
{
    Console.WriteLine("Muted successfully");
}
else
{
    Console.WriteLine("Failed to mute");
}

Process Information:

string processName = audioSession.GetProcessName();
Console.WriteLine($"Audio session process: {processName}");

Playback management example:

using EonaCat.VolumeMixer.Managers;
using EonaCat.VolumeMixer.Models;
using System;
using System.Threading.Tasks;

class Program
{
    // This file is part of the EonaCat project(s) which is released under the Apache License.
    // See the LICENSE file or go to https://EonaCat.com/License for full license details.
    [STAThread]
    static async Task Main()
    {
        // Playback management example
        using (var volumeMixer = new VolumeMixerManager())
        {
            try
            {
                // Get all audio PLAYBACK devices
                var devices = await volumeMixer.GetAudioDevicesAsync(DataFlow.Output);
                Console.WriteLine($"Found {devices.Count} playback devices:");

                foreach (var device in devices)
                {
                    Console.WriteLine($"- {device.Name} (Default: {device.IsDefault})");
                    Console.WriteLine($"  Volume: {await device.GetMasterVolumeAsync():P0}");
                    Console.WriteLine($"  Muted: {await device.GetMasterMuteAsync()}");
                    device.Dispose();
                }

                // Default playback device
                using (var defaultDevice = await volumeMixer.GetDefaultAudioDeviceAsync(DataFlow.Output))
                {
                    if (defaultDevice != null)
                    {
                        Console.WriteLine($"\nDefault playback device: {defaultDevice.Name}");

                        // Get all audio sessions
                        var sessions = await defaultDevice.GetAudioSessionsAsync();
                        Console.WriteLine($"Active sessions: {sessions.Count}");

                        foreach (var session in sessions)
                        {
                            Console.WriteLine($"- {session.DisplayName} ({await session.GetProcessNameAsync()})");
                            Console.WriteLine($"  Volume: {await session.GetVolumeAsync():P0}");
                            Console.WriteLine($"  Muted: {await session.GetMuteAsync()}");
                            session.Dispose();
                        }
                    }

                    // Example Set volume of default device
                    if (defaultDevice != null)
                    {
                        // Unmute the device if it is muted
                        if (await defaultDevice.GetMasterMuteAsync())
                        {
                            Console.WriteLine("Unmuting default playback device...");
                            await defaultDevice.SetMasterMuteAsync(false);
                        }

                        Console.WriteLine($"\nSetting default playback device volume to 1%");
                        bool success = await defaultDevice.SetMasterVolumeAsync(0.1f);

                        // Log the current volume
                        Console.WriteLine($"Current volume: {await defaultDevice.GetMasterVolumeAsync():P0}");

                        for (int i = 0; i < 50; i++)
                        {
                            if (await defaultDevice.GetMasterVolumeAsync() >= 1f)
                            {
                                break;
                            }

                            // Increment volume by 2% each step
                            success = await defaultDevice.StepUpAsync();
                            Console.WriteLine($"Current step volume: {await defaultDevice.GetMasterVolumeAsync():P0}");
                        }

                        if (success)
                        {
                            Console.WriteLine("Volume increased by 95% successfully.");
                        }
                        else
                        {
                            Console.WriteLine("Failed to increase volume.");
                        }

                        // Toggle mute
                        // bool currentMute = await defaultDevice.GetMasterMuteAsync();
                        // success = await defaultDevice.SetMasterMuteAsync(!currentMute);
                        // Console.WriteLine($"Mute toggled: {success}");
                    }
                    else
                    {
                        Console.WriteLine("No default playback device found");
                    }
                }
            }
            catch (Exception ex)
            {
                Console.WriteLine($"Error: {ex.Message}");
            }
        }
    }
}

Microphone management example:

using EonaCat.VolumeMixer.Managers;
using EonaCat.VolumeMixer.Models;
using System;
using System.Threading.Tasks;

class Program
{
    // This file is part of the EonaCat project(s) which is released under the Apache License.
    // See the LICENSE file or go to https://EonaCat.com/License for full license details.
    [STAThread]
    static async Task Main()
    {
        // Microphone management example
        using (var micManager = new MicrophoneManager())
        {
            try
            {
                // Get all microphones
                var microphones = await micManager.GetMicrophonesAsync();
                Console.WriteLine($"Found {microphones.Count} microphones:");

                foreach (var mic in microphones)
                {
                    Console.WriteLine($"- {mic.Name} (Default: {mic.IsDefault})");
                    Console.WriteLine($"  Volume: {await mic.GetMasterVolumeAsync():P0}");
                    Console.WriteLine($"  Muted: {await mic.GetMasterMuteAsync()}");
                    mic.Dispose();
                }

                // Default microphone
                using (var defaultMic = await micManager.GetDefaultMicrophoneAsync())
                {
                    Console.WriteLine($"\nSetting default microphone volume to 1%");
                    bool success = await defaultMic.SetMasterVolumeAsync(0.1f);

                    // Log the current volume
                    Console.WriteLine($"Current volume: {await defaultMic.GetMasterVolumeAsync():P0}");

                    for (int i = 0; i < 50; i++)
                    {
                        if (await defaultMic.GetMasterVolumeAsync() >= 1f)
                        {
                            break;
                        }

                        // Increment volume by 2% each step
                        success = await defaultMic.StepUpAsync();
                        Console.WriteLine($"Current step volume: {await defaultMic.GetMasterVolumeAsync():P0}");
                    }

                    if (success)
                    {
                        Console.WriteLine("Volume increased by 95% successfully.");
                    }
                    else
                    {
                        Console.WriteLine("Failed to increase volume.");
                    }
                }

                Console.WriteLine($"Default mic volume: {await micManager.GetMicrophoneVolumeAsync():P0}");
                Console.WriteLine($"Default mic muted: {await micManager.GetMicrophoneMuteAsync()}");

                // Set microphone volume to 60%
                bool result = await micManager.SetMicrophoneVolumeAsync(0.6f);
                Console.WriteLine($"Set microphone volume to 60%: {result}");

                // Set specific microphone by name
                result = await micManager.SetMicrophoneVolumeByNameAsync("USB", 0.7f);
                Console.WriteLine($"Set USB microphone volume to 70%: {result}");

            }
            catch (Exception exception)
            {
                Console.WriteLine($"Error: {exception.Message}");
            }
        }
    }
}