AudioSwitcher/CoreAudioApi.cs at main · Ambar9926/AudioSwitcher · GitHub

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using System;
using System.Runtime.InteropServices;

namespace AudioSwitcher;

[ComImport, Guid("BCDE0395-E52F-467C-8E3D-C4579291692E")]
internal class MMDeviceEnumeratorCom { }

[Guid("A95664D2-9614-4F35-A746-DE8DB63617E6")]
[InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
internal interface IMMDeviceEnumerator
{
    int EnumAudioEndpoints(EDataFlow dataFlow, uint stateMask, out IMMDeviceCollection devices);
    int GetDefaultAudioEndpoint(EDataFlow dataFlow, ERole role, out IMMDevice device);
    int GetDevice(string id, out IMMDevice device);
}

[Guid("0BD7A1BE-7A1A-44DB-8397-CC5392387B5E")]
[InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
internal interface IMMDeviceCollection
{
    int GetCount(out int count);
    int Item(int index, out IMMDevice device);
}

[Guid("D666063F-1587-4E43-81F1-B948E807363F")]
[InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
internal interface IMMDevice
{
    int Activate(ref Guid iid, int clsCtx, IntPtr activationParams,
        [MarshalAs(UnmanagedType.IUnknown)] out object iface);
    int OpenPropertyStore(int access, out IPropertyStore properties);
    int GetId([MarshalAs(UnmanagedType.LPWStr)] out string id);
    int GetState(out int state);
}

[Guid("886D8EEB-8CF2-4446-8D02-CDBA1DBDCF99")]
[InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
internal interface IPropertyStore
{
    int GetCount(out int count);
    int GetAt(int index, out PropertyKey key);
    int GetValue(ref PropertyKey key, out PropVariant value);
    int SetValue(ref PropertyKey key, ref PropVariant value);
    int Commit();
}

[Guid("F8679F50-850A-41CF-9C72-430F290290C8")]
[InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
internal interface IPolicyConfig
{
    int GetMixFormat(string deviceId, IntPtr format);
    int GetDeviceFormat(string deviceId, int isDefault, IntPtr format);
    int ResetDeviceFormat(string deviceId);
    int SetDeviceFormat(string deviceId, IntPtr endpointFormat, IntPtr mixFormat);
    int GetProcessingPeriod(string deviceId, int isDefault, IntPtr defaultPeriod, IntPtr minPeriod);
    int SetProcessingPeriod(string deviceId, IntPtr period);
    int GetShareMode(string deviceId, IntPtr mode);
    int SetShareMode(string deviceId, IntPtr mode);
    int GetPropertyValue(string deviceId, int isStore, PropertyKey key, out PropVariant value);
    int SetPropertyValue(string deviceId, int isStore, PropertyKey key, ref PropVariant value);
    int SetDefaultEndpoint(string deviceId, ERole role);
    int SetEndpointVisibility(string deviceId, int isVisible);
}

[ComImport, Guid("870AF99C-171D-4F9E-AF0D-E63DF40C2BC9")]
internal class PolicyConfigCom { }

internal enum EDataFlow { eRender = 0, eCapture = 1, eAll = 2 }
internal enum ERole { eConsole = 0, eMultimedia = 1, eCommunications = 2 }

[StructLayout(LayoutKind.Sequential)]
internal struct PropertyKey
{
    public Guid fmtid;
    public int pid;
    public PropertyKey(Guid fmtid, int pid) { this.fmtid = fmtid; this.pid = pid; }
}

[StructLayout(LayoutKind.Sequential)]
internal struct PropVariant
{
    public ushort vt;
    private ushort wReserved1, wReserved2, wReserved3;
    public IntPtr data1;
    public IntPtr data2;
    public string? StringValue =>
        vt == 31 /* VT_LPWSTR */ ? Marshal.PtrToStringUni(data1) : null;
}