MonguAudioSync/Form2.cs at master · Powermongur/MonguAudioSync · GitHub

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using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

using System.Runtime.InteropServices;

namespace Mongu_Audio_Sync
{
    public partial class Form2 : Form
    {
        internal enum EDataFlow {
            eRender, eCapture, eAll, EDataFlow_enum_count
        }

        internal enum ERole {
            eConsole, eMultimedia, eCommunications, ERole_enum_count
        }

        [ComImport]
        [Guid("A95664D2-9614-4F35-A746-DE8DB63617E6"), InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
        private interface IMMDeviceEnumerator
        {
            void _VtblGap1_1();
            int GetDefaultAudioEndpoint(EDataFlow dataFlow, ERole role, out IMMDevice ppDevice);
        }
        private static class MMDeviceEnumeratorFactory
        {
            public static IMMDeviceEnumerator CreateInstance()
            {
                return (IMMDeviceEnumerator)Activator.CreateInstance(Type.GetTypeFromCLSID(new Guid("BCDE0395-E52F-467C-8E3D-C4579291692E"))); // a MMDeviceEnumerator
            }
        }

        [Guid("D666063F-1587-4E43-81F1-B948E807363F"), InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
        private interface IMMDevice
        {
            int Activate([MarshalAs(UnmanagedType.LPStruct)] Guid iid, int dwClsCtx, IntPtr pActivationParams, [MarshalAs(UnmanagedType.IUnknown)] out object ppInterface);
        }


        [Guid("5CDF2C82-841E-4546-9722-0CF74078229A"), InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
        public interface IAudioEndpointVolume
        {
            int RegisterControlChangeNotify(IntPtr pNotify);
            int UnregisterControlChangeNotify(IntPtr pNotify);
            int GetChannelCount(out uint pnChannelCount);
            int SetMasterVolumeLevel(float fLevelDB, Guid pguidEventContext);
            int SetMasterVolumeLevelScalar(float fLevel, Guid pguidEventContext);
            int GetMasterVolumeLevel(out float pfLevelDB);
            int GetMasterVolumeLevelScalar(out float pfLevel);
            int GetMute(out bool isMuted);
            int SetMute(bool bMute, Guid pguidEventContext);
        }

        public Form2()
        {
            InitializeComponent();
        }

        private void Form2_Load(object sender, EventArgs e)
        {

        }

        private void button1_Click(object sender, EventArgs e)
        {
            int level = Int32.Parse(textBox1.Text);

            IMMDeviceEnumerator deviceEnumerator = MMDeviceEnumeratorFactory.CreateInstance();
            IMMDevice speakers;
            deviceEnumerator.GetDefaultAudioEndpoint(EDataFlow.eRender, ERole.eMultimedia, out speakers);

            object aepv_obj;
            speakers.Activate(typeof(IAudioEndpointVolume).GUID, 0, IntPtr.Zero, out aepv_obj);
            IAudioEndpointVolume aepv = (IAudioEndpointVolume)aepv_obj;
            int res = aepv.SetMasterVolumeLevelScalar(level / 100f, new Guid());
        }

        private void button2_Click(object sender, EventArgs e)
        {
            IMMDeviceEnumerator deviceEnumerator = MMDeviceEnumeratorFactory.CreateInstance();
            IMMDevice speakers;
            deviceEnumerator.GetDefaultAudioEndpoint(EDataFlow.eRender, ERole.eMultimedia, out speakers);

            object aepv_obj;
            speakers.Activate(typeof(IAudioEndpointVolume).GUID, 0, IntPtr.Zero, out aepv_obj);
            IAudioEndpointVolume aepv = (IAudioEndpointVolume)aepv_obj;

            float fLevel;
            aepv.GetMasterVolumeLevelScalar(out fLevel);

            label1.Text = $"Volume: {(int)(fLevel * 100)}%";
        }

        private void button3_Click(object sender, EventArgs e)
        {
            IMMDeviceEnumerator deviceEnumerator = MMDeviceEnumeratorFactory.CreateInstance();
            IMMDevice speakers;
            deviceEnumerator.GetDefaultAudioEndpoint(EDataFlow.eRender, ERole.eMultimedia, out speakers);

            object aepv_obj;
            speakers.Activate(typeof(IAudioEndpointVolume).GUID, 0, IntPtr.Zero, out aepv_obj);
            IAudioEndpointVolume aepv = (IAudioEndpointVolume)aepv_obj;

            bool mute = false;
            int isMuteda = aepv.GetMute(out mute);
        }

        private void trackBar1_ValueChanged(object sender, EventArgs e)
        {
            textBox1.Text = trackBar1.Value.ToString();
        }

        private void trackBar2_ValueChanged(object sender, EventArgs e)
        {
            int level = trackBar2.Value;
            textBox2.Text = level.ToString();

            IMMDeviceEnumerator deviceEnumerator = MMDeviceEnumeratorFactory.CreateInstance();
            IMMDevice speakers;
            deviceEnumerator.GetDefaultAudioEndpoint(EDataFlow.eRender, ERole.eMultimedia, out speakers);

            object aepv_obj;
            speakers.Activate(typeof(IAudioEndpointVolume).GUID, 0, IntPtr.Zero, out aepv_obj);
            IAudioEndpointVolume aepv = (IAudioEndpointVolume)aepv_obj;
            int res = aepv.SetMasterVolumeLevelScalar(level / 100f, new Guid());
        }

        private void button4_Click(object sender, EventArgs e)
        {
            IMMDeviceEnumerator deviceEnumerator = MMDeviceEnumeratorFactory.CreateInstance();
            IMMDevice speakers;
            deviceEnumerator.GetDefaultAudioEndpoint(EDataFlow.eRender, ERole.eMultimedia, out speakers);

            object aepv_obj;
            speakers.Activate(typeof(IAudioEndpointVolume).GUID, 0, IntPtr.Zero, out aepv_obj);
            IAudioEndpointVolume aepv = (IAudioEndpointVolume)aepv_obj;

            aepv.SetMute(true, new Guid());
        }

        private void button5_Click(object sender, EventArgs e)
        {
            IMMDeviceEnumerator deviceEnumerator = MMDeviceEnumeratorFactory.CreateInstance();
            IMMDevice speakers;
            deviceEnumerator.GetDefaultAudioEndpoint(EDataFlow.eRender, ERole.eMultimedia, out speakers);

            object aepv_obj;
            speakers.Activate(typeof(IAudioEndpointVolume).GUID, 0, IntPtr.Zero, out aepv_obj);
            IAudioEndpointVolume aepv = (IAudioEndpointVolume)aepv_obj;

            aepv.SetMute(false, new Guid());
        }
    }
}