FocusVolumeControlPlugin/src/SoundBrowser/MainWindow.xaml.cs

using FocusVolumeControl;
using FocusVolumeControl.AudioHelpers;
using FocusVolumeControl.AudioSessions;
using System;
using System.Diagnostics;
using System.Text;
using System.Windows;

namespace SoundBrowser;

/// <summary>
/// Interaction logic for MainWindow.xaml
/// </summary>
public partial class MainWindow : Window
{

	AudioHelper _audioHelper;
	Native.WinEventDelegate _delegate;

	public MainWindow()
	{
		InitializeComponent();
		_audioHelper = new AudioHelper();

		//normally you can just pass a lambda, but for some reason, that seems to get garbage collected
		_delegate = new Native.WinEventDelegate(WinEventProc);
		Native.RegisterForForegroundWindowChangedEvent(_delegate);
	}

	public void WinEventProc(IntPtr hWinEventHook, uint eventType, IntPtr hwnd, int idObject, int idChild, uint dwEventThread, uint dwmsEventTime)
	{
		SetupCurrentAppFields();
		SetupAllSessionFields();
	}

	private void SetupCurrentAppFields()
	{
		var handle = Native.GetForegroundWindow();
		var sb = new StringBuilder();

		if (handle != IntPtr.Zero)
		{
			//use this in debug to help there be less events

			/*
			Native.GetWindowThreadProcessId(handle, out var fpid);
			var fp = Process.GetProcessById(fpid);

			if(!fp.ProcessName.Contains("FSD"))
			{
				return;
			}
			*/

			var processes = _audioHelper.GetPossibleProcesses();
			var session = _audioHelper.FindSession(processes);

			foreach (var p in processes)
			{
				var (displayName, _) = (new NameAndIconHelper()).GetProcessInfo(p);

				sb.AppendLine($"pid: {p.Id}");
				sb.AppendLine($"\tprocessName: {p.ProcessName}");
				sb.AppendLine($"\tDisplayName: {displayName}");

			}

			sb.AppendLine();
			if (session != null)
			{
				sb.AppendLine("picked the following best match");
				sb.AppendLine($"\tsession: {session.DisplayName}");
				sb.AppendLine($"\tvolume: {session.GetVolumeLevel()}");
			}
			else
			{
				sb.AppendLine("No Match");
			}
		}

		_tf.Text = sb.ToString();
	}

	private void SetupAllSessionFields()
	{
		_tf2.Text = "";
		var sb = new StringBuilder();
		sb.AppendLine("-------------------------------------------------------------------------------");

		var deviceEnumerator = (IMMDeviceEnumerator)new MMDeviceEnumerator();

		deviceEnumerator.EnumAudioEndpoints(DataFlow.Render, DeviceState.Active, out var deviceCollection);
		deviceCollection.GetCount(out var num);

		for(int i = 0; i < num; i++)
		{
			deviceCollection.Item(i, out var device);
			//todo: put the device name in the output
			sb.AppendLine("----");

			Guid iid = typeof(IAudioSessionManager2).GUID;
			device.Activate(ref iid, 0, IntPtr.Zero, out var m);
			var manager = (IAudioSessionManager2)m;


			manager.GetSessionEnumerator(out var sessionEnumerator);


			sessionEnumerator.GetCount(out var count);
			for (int s = 0; s < count; s++)
			{
				sessionEnumerator.GetSession(s, out var session);

				session.GetProcessId(out var processId);
				var audioProcess = Process.GetProcessById(processId);

				var (displayName, _) = (new NameAndIconHelper()).GetProcessInfo(audioProcess);
				sb.AppendLine($"pid: {audioProcess.Id}\t\t processName: {displayName}");
			}

			_tf2.Text = sb.ToString();
		}
	}

}