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; AutoHotkey Vista Audio Control Function v2.3
; Created by Lexikos
; https://www.autohotkey.com/board/topic/21984-vista-audio-control-functions/?p=143564
; 
; MASTER CONTROLS
;

VA_GetMasterVolume(channel="", device_desc="playback")
{
    if ! aev := VA_GetAudioEndpointVolume(device_desc)
        return
    if channel =
        VA_IAudioEndpointVolume_GetMasterVolumeLevelScalar(aev, vol)
    else
        VA_IAudioEndpointVolume_GetChannelVolumeLevelScalar(aev, channel-1, vol)
    ObjRelease(aev)
    return Round(vol*100,3)
}

VA_SetMasterVolume(vol, channel="", device_desc="playback")
{
    vol := vol>100 ? 100 : vol<0 ? 0 : vol
    if ! aev := VA_GetAudioEndpointVolume(device_desc)
        return
    if channel =
        VA_IAudioEndpointVolume_SetMasterVolumeLevelScalar(aev, vol/100)
    else
        VA_IAudioEndpointVolume_SetChannelVolumeLevelScalar(aev, channel-1, vol/100)
    ObjRelease(aev)
}

VA_GetMasterChannelCount(device_desc="playback")
{
    if ! aev := VA_GetAudioEndpointVolume(device_desc)
        return
    VA_IAudioEndpointVolume_GetChannelCount(aev, count)
    ObjRelease(aev)
    return count
}

VA_SetMasterMute(mute, device_desc="playback")
{
    if ! aev := VA_GetAudioEndpointVolume(device_desc)
        return
    VA_IAudioEndpointVolume_SetMute(aev, mute)
    ObjRelease(aev)
}

VA_GetMasterMute(device_desc="playback")
{
    if ! aev := VA_GetAudioEndpointVolume(device_desc)
        return
    VA_IAudioEndpointVolume_GetMute(aev, mute)
    ObjRelease(aev)
    return mute
}

;
; SUBUNIT CONTROLS
;

VA_GetVolume(subunit_desc="1", channel="", device_desc="playback")
{
    if ! avl := VA_GetDeviceSubunit(device_desc, subunit_desc, "{7FB7B48F-531D-44A2-BCB3-5AD5A134B3DC}")
        return
    VA_IPerChannelDbLevel_GetChannelCount(avl, channel_count)
    if channel =
    {
        vol = 0
        
        Loop, %channel_count%
        {
            VA_IPerChannelDbLevel_GetLevelRange(avl, A_Index-1, min_dB, max_dB, step_dB)
            VA_IPerChannelDbLevel_GetLevel(avl, A_Index-1, this_vol)
            this_vol := VA_dB2Scalar(this_vol, min_dB, max_dB)
            
            ; "Speakers Properties" reports the highest channel as the volume.
            if (this_vol > vol)
                vol := this_vol
        }
    }
    else if channel between 1 and channel_count
    {
        channel -= 1
        VA_IPerChannelDbLevel_GetLevelRange(avl, channel, min_dB, max_dB, step_dB)
        VA_IPerChannelDbLevel_GetLevel(avl, channel, vol)
        vol := VA_dB2Scalar(vol, min_dB, max_dB)
    }
    ObjRelease(avl)
    return vol
}

VA_SetVolume(vol, subunit_desc="1", channel="", device_desc="playback")
{
    if ! avl := VA_GetDeviceSubunit(device_desc, subunit_desc, "{7FB7B48F-531D-44A2-BCB3-5AD5A134B3DC}")
        return
    
    vol := vol<0 ? 0 : vol>100 ? 100 : vol
    
    VA_IPerChannelDbLevel_GetChannelCount(avl, channel_count)
    
    if channel =
    {
        ; Simple method -- resets balance to "center":
        ;VA_IPerChannelDbLevel_SetLevelUniform(avl, vol)
        
        vol_max = 0
        
        Loop, %channel_count%
        {
            VA_IPerChannelDbLevel_GetLevelRange(avl, A_Index-1, min_dB, max_dB, step_dB)
            VA_IPerChannelDbLevel_GetLevel(avl, A_Index-1, this_vol)
            this_vol := VA_dB2Scalar(this_vol, min_dB, max_dB)
            
            channel%A_Index%vol := this_vol
            channel%A_Index%min := min_dB
            channel%A_Index%max := max_dB
            
            ; Scale all channels relative to the loudest channel.
            ; (This is how Vista's "Speakers Properties" dialog seems to work.)
            if (this_vol > vol_max)
                vol_max := this_vol
        }
        
        Loop, %channel_count%
        {
            this_vol := vol_max ? channel%A_Index%vol / vol_max * vol : vol
            this_vol := VA_Scalar2dB(this_vol/100, channel%A_Index%min, channel%A_Index%max)            
            VA_IPerChannelDbLevel_SetLevel(avl, A_Index-1, this_vol)
        }
    }
    else if channel between 1 and %channel_count%
    {
        channel -= 1
        VA_IPerChannelDbLevel_GetLevelRange(avl, channel, min_dB, max_dB, step_dB)
        VA_IPerChannelDbLevel_SetLevel(avl, channel, VA_Scalar2dB(vol/100, min_dB, max_dB))
    }
    ObjRelease(avl)
}

VA_GetChannelCount(subunit_desc="1", device_desc="playback")
{
    if ! avl := VA_GetDeviceSubunit(device_desc, subunit_desc, "{7FB7B48F-531D-44A2-BCB3-5AD5A134B3DC}")
        return
    VA_IPerChannelDbLevel_GetChannelCount(avl, channel_count)
    ObjRelease(avl)
    return channel_count
}

VA_SetMute(mute, subunit_desc="1", device_desc="playback")
{
    if ! amute := VA_GetDeviceSubunit(device_desc, subunit_desc, "{DF45AEEA-B74A-4B6B-AFAD-2366B6AA012E}")
        return
    VA_IAudioMute_SetMute(amute, mute)
    ObjRelease(amute)
}

VA_GetMute(subunit_desc="1", device_desc="playback")
{
    if ! amute := VA_GetDeviceSubunit(device_desc, subunit_desc, "{DF45AEEA-B74A-4B6B-AFAD-2366B6AA012E}")
        return
    VA_IAudioMute_GetMute(amute, muted)
    ObjRelease(amute)
    return muted
}

;
; AUDIO METERING
;

VA_GetAudioMeter(device_desc="playback")
{
    if ! device := VA_GetDevice(device_desc)
        return 0
    VA_IMMDevice_Activate(device, "{C02216F6-8C67-4B5B-9D00-D008E73E0064}", 7, 0, audioMeter)
    ObjRelease(device)
    return audioMeter
}

VA_GetDevicePeriod(device_desc, ByRef default_period, ByRef minimum_period="")
{
    defaultPeriod := minimumPeriod := 0
    if ! device := VA_GetDevice(device_desc)
        return false
    VA_IMMDevice_Activate(device, "{1CB9AD4C-DBFA-4c32-B178-C2F568A703B2}", 7, 0, audioClient)
    ObjRelease(device)
    ; IAudioClient::GetDevicePeriod
    DllCall(NumGet(NumGet(audioClient+0)+9*A_PtrSize), "ptr",audioClient, "int64*",default_period, "int64*",minimum_period)
    ; Convert 100-nanosecond units to milliseconds.
    default_period /= 10000
    minimum_period /= 10000    
    ObjRelease(audioClient)
    return true
}

VA_GetAudioEndpointVolume(device_desc="playback")
{
    if ! device := VA_GetDevice(device_desc)
        return 0
    VA_IMMDevice_Activate(device, "{5CDF2C82-841E-4546-9722-0CF74078229A}", 7, 0, endpointVolume)
    ObjRelease(device)
    return endpointVolume
}

VA_GetDeviceSubunit(device_desc, subunit_desc, subunit_iid)
{
    if ! device := VA_GetDevice(device_desc)
        return 0
    subunit := VA_FindSubunit(device, subunit_desc, subunit_iid)
    ObjRelease(device)
    return subunit
}

VA_FindSubunit(device, target_desc, target_iid)
{
    if target_desc is integer
        target_index := target_desc
    else
        RegExMatch(target_desc, "(?<_name>.*?)(?::(?<_index>\d+))?$", target)
    ; v2.01: Since target_name is now a regular expression, default to case-insensitive mode if no options are specified.
    if !RegExMatch(target_name,"^[^\(]+\)")
        target_name := "i)" target_name
    r := VA_EnumSubunits(device, "VA_FindSubunitCallback", target_name, target_iid
            , Object(0, target_index ? target_index : 1, 1, 0))
    return r
}

VA_FindSubunitCallback(part, interface, index)
{
    index[1] := index[1] + 1 ; current += 1
    if (index[0] == index[1]) ; target == current ?
    {
        ObjAddRef(interface)
        return interface
    }
}

VA_EnumSubunits(device, callback, target_name="", target_iid="", callback_param="")
{
    VA_IMMDevice_Activate(device, "{2A07407E-6497-4A18-9787-32F79BD0D98F}", 7, 0, deviceTopology)
    VA_IDeviceTopology_GetConnector(deviceTopology, 0, conn)
    ObjRelease(deviceTopology)
    VA_IConnector_GetConnectedTo(conn, conn_to)
    VA_IConnector_GetDataFlow(conn, data_flow)
    ObjRelease(conn)
    if !conn_to
        return ; blank to indicate error
    part := ComObjQuery(conn_to, "{AE2DE0E4-5BCA-4F2D-AA46-5D13F8FDB3A9}") ; IID_IPart
    ObjRelease(conn_to)
    if !part
        return
    r := VA_EnumSubunitsEx(part, data_flow, callback, target_name, target_iid, callback_param)
    ObjRelease(part)
    return r ; value returned by callback, or zero.
}

VA_EnumSubunitsEx(part, data_flow, callback, target_name="", target_iid="", callback_param="")
{
    r := 0
    
    VA_IPart_GetPartType(part, type)
   
    if type = 1 ; Subunit
    {
        VA_IPart_GetName(part, name)
        
        ; v2.01: target_name is now a regular expression.
        if RegExMatch(name, target_name)
        {
            if target_iid =
                r := %callback%(part, 0, callback_param)
            else
                if VA_IPart_Activate(part, 7, target_iid, interface) = 0
                {
                    r := %callback%(part, interface, callback_param)
                    ; The callback is responsible for calling ObjAddRef()
                    ; if it intends to keep the interface pointer.
                    ObjRelease(interface)
                }

            if r
                return r ; early termination
        }
    }
    
    if data_flow = 0
        VA_IPart_EnumPartsIncoming(part, parts)
    else
        VA_IPart_EnumPartsOutgoing(part, parts)
    
    VA_IPartsList_GetCount(parts, count)
    Loop %count%
    {
        VA_IPartsList_GetPart(parts, A_Index-1, subpart)        
        r := VA_EnumSubunitsEx(subpart, data_flow, callback, target_name, target_iid, callback_param)
        ObjRelease(subpart)
        if r
            break ; early termination
    }
    ObjRelease(parts)
    return r ; continue/finished enumeration
}

; device_desc = device_id
;               | ( friendly_name | 'playback' | 'capture' ) [ ':' index ]
VA_GetDevice(device_desc="playback")
{
    static CLSID_MMDeviceEnumerator := "{BCDE0395-E52F-467C-8E3D-C4579291692E}"
        , IID_IMMDeviceEnumerator := "{A95664D2-9614-4F35-A746-DE8DB63617E6}"
    if !(deviceEnumerator := ComObjCreate(CLSID_MMDeviceEnumerator, IID_IMMDeviceEnumerator))
        return 0
    
    device := 0
    
    if VA_IMMDeviceEnumerator_GetDevice(deviceEnumerator, device_desc, device) = 0
        goto VA_GetDevice_Return
    
    if device_desc is integer
    {
        m2 := device_desc
        if m2 >= 4096 ; Probably a device pointer, passed here indirectly via VA_GetAudioMeter or such.
        {
            ObjAddRef(device := m2)
            goto VA_GetDevice_Return
        }
    }
    else
        RegExMatch(device_desc, "(.*?)\s*(?::(\d+))?$", m)
    
    if m1 in playback,p
        m1 := "", flow := 0 ; eRender
    else if m1 in capture,c
        m1 := "", flow := 1 ; eCapture
    else if (m1 . m2) = ""  ; no name or number specified
        m1 := "", flow := 0 ; eRender (default)
    else
        flow := 2 ; eAll
    
    if (m1 . m2) = ""   ; no name or number (maybe "playback" or "capture")
    {
        VA_IMMDeviceEnumerator_GetDefaultAudioEndpoint(deviceEnumerator, flow, 0, device)
        goto VA_GetDevice_Return
    }

    VA_IMMDeviceEnumerator_EnumAudioEndpoints(deviceEnumerator, flow, 1, devices)
    
    if m1 =
    {
        VA_IMMDeviceCollection_Item(devices, m2-1, device)
        goto VA_GetDevice_Return
    }
    
    VA_IMMDeviceCollection_GetCount(devices, count)
    index := 0
    Loop % count
        if VA_IMMDeviceCollection_Item(devices, A_Index-1, device) = 0
            if InStr(VA_GetDeviceName(device), m1) && (m2 = "" || ++index = m2)
                goto VA_GetDevice_Return
            else
                ObjRelease(device), device:=0

VA_GetDevice_Return:
    ObjRelease(deviceEnumerator)
    if devices
        ObjRelease(devices)
    
    return device ; may be 0
}

VA_GetDeviceName(device)
{
    static PKEY_Device_FriendlyName
    if !VarSetCapacity(PKEY_Device_FriendlyName)
        VarSetCapacity(PKEY_Device_FriendlyName, 20)
        ,VA_GUID(PKEY_Device_FriendlyName :="{A45C254E-DF1C-4EFD-8020-67D146A850E0}")
        ,NumPut(14, PKEY_Device_FriendlyName, 16)
    VarSetCapacity(prop, 16)
    VA_IMMDevice_OpenPropertyStore(device, 0, store)
    ; store->GetValue(.., [out] prop)
    DllCall(NumGet(NumGet(store+0)+5*A_PtrSize), "ptr", store, "ptr", &PKEY_Device_FriendlyName, "ptr", &prop)
    ObjRelease(store)
    VA_WStrOut(deviceName := NumGet(prop,8))
    return deviceName
}

VA_SetDefaultEndpoint(device_desc, role)
{
    /* Roles:
         eConsole        = 0  ; Default Device
         eMultimedia     = 1
         eCommunications = 2  ; Default Communications Device
    */
    if ! device := VA_GetDevice(device_desc)
        return 0
    if VA_IMMDevice_GetId(device, id) = 0
    {
        cfg := ComObjCreate("{294935CE-F637-4E7C-A41B-AB255460B862}"
                          , "{568b9108-44bf-40b4-9006-86afe5b5a620}")
        hr := VA_xIPolicyConfigVista_SetDefaultEndpoint(cfg, id, role)
        ObjRelease(cfg)
    }
    ObjRelease(device)
    return hr = 0
}


;
; HELPERS
;

; Convert string to binary GUID structure.
VA_GUID(ByRef guid_out, guid_in="%guid_out%") {
    if (guid_in == "%guid_out%")
        guid_in :=   guid_out
    if  guid_in is integer
        return guid_in
    VarSetCapacity(guid_out, 16, 0)
	DllCall("ole32\CLSIDFromString", "wstr", guid_in, "ptr", &guid_out)
	return &guid_out
}

; Convert binary GUID structure to string.
VA_GUIDOut(ByRef guid) {
    VarSetCapacity(buf, 78)
    DllCall("ole32\StringFromGUID2", "ptr", &guid, "ptr", &buf, "int", 39)
    guid := StrGet(&buf, "UTF-16")
}

; Convert COM-allocated wide char string pointer to usable string.
VA_WStrOut(ByRef str) {
    str := StrGet(ptr := str, "UTF-16")
    DllCall("ole32\CoTaskMemFree", "ptr", ptr)  ; FREES THE STRING.
}

VA_dB2Scalar(dB, min_dB, max_dB) {
    min_s := 10**(min_dB/20), max_s := 10**(max_dB/20)
    return ((10**(dB/20))-min_s)/(max_s-min_s)*100
}

VA_Scalar2dB(s, min_dB, max_dB) {
    min_s := 10**(min_dB/20), max_s := 10**(max_dB/20)
    return log((max_s-min_s)*s+min_s)*20
}


;
; INTERFACE WRAPPERS
;   Reference: Core Audio APIs in Windows Vista -- Programming Reference
;       http://msdn2.microsoft.com/en-us/library/ms679156(VS.85).aspx
;

;
; IMMDevice : {D666063F-1587-4E43-81F1-B948E807363F}
;
VA_IMMDevice_Activate(this, iid, ClsCtx, ActivationParams, ByRef Interface) {
    return DllCall(NumGet(NumGet(this+0)+3*A_PtrSize), "ptr", this, "ptr", VA_GUID(iid), "uint", ClsCtx, "uint", ActivationParams, "ptr*", Interface)
}
VA_IMMDevice_OpenPropertyStore(this, Access, ByRef Properties) {
    return DllCall(NumGet(NumGet(this+0)+4*A_PtrSize), "ptr", this, "uint", Access, "ptr*", Properties)
}
VA_IMMDevice_GetId(this, ByRef Id) {
    hr := DllCall(NumGet(NumGet(this+0)+5*A_PtrSize), "ptr", this, "uint*", Id)
    VA_WStrOut(Id)
    return hr
}
VA_IMMDevice_GetState(this, ByRef State) {
    return DllCall(NumGet(NumGet(this+0)+6*A_PtrSize), "ptr", this, "uint*", State)
}

;
; IDeviceTopology : {2A07407E-6497-4A18-9787-32F79BD0D98F}
;
VA_IDeviceTopology_GetConnectorCount(this, ByRef Count) {
    return DllCall(NumGet(NumGet(this+0)+3*A_PtrSize), "ptr", this, "uint*", Count)
}
VA_IDeviceTopology_GetConnector(this, Index, ByRef Connector) {
    return DllCall(NumGet(NumGet(this+0)+4*A_PtrSize), "ptr", this, "uint", Index, "ptr*", Connector)
}
VA_IDeviceTopology_GetSubunitCount(this, ByRef Count) {
    return DllCall(NumGet(NumGet(this+0)+5*A_PtrSize), "ptr", this, "uint*", Count)
}
VA_IDeviceTopology_GetSubunit(this, Index, ByRef Subunit) {
    return DllCall(NumGet(NumGet(this+0)+6*A_PtrSize), "ptr", this, "uint", Index, "ptr*", Subunit)
}
VA_IDeviceTopology_GetPartById(this, Id, ByRef Part) {
    return DllCall(NumGet(NumGet(this+0)+7*A_PtrSize), "ptr", this, "uint", Id, "ptr*", Part)
}
VA_IDeviceTopology_GetDeviceId(this, ByRef DeviceId) {
    hr := DllCall(NumGet(NumGet(this+0)+8*A_PtrSize), "ptr", this, "uint*", DeviceId)
    VA_WStrOut(DeviceId)
    return hr
}
VA_IDeviceTopology_GetSignalPath(this, PartFrom, PartTo, RejectMixedPaths, ByRef Parts) {
    return DllCall(NumGet(NumGet(this+0)+9*A_PtrSize), "ptr", this, "ptr", PartFrom, "ptr", PartTo, "int", RejectMixedPaths, "ptr*", Parts)
}

;
; IConnector : {9c2c4058-23f5-41de-877a-df3af236a09e}
;
VA_IConnector_GetType(this, ByRef Type) {
    return DllCall(NumGet(NumGet(this+0)+3*A_PtrSize), "ptr", this, "int*", Type)
}
VA_IConnector_GetDataFlow(this, ByRef Flow) {
    return DllCall(NumGet(NumGet(this+0)+4*A_PtrSize), "ptr", this, "int*", Flow)
}
VA_IConnector_ConnectTo(this, ConnectTo) {
    return DllCall(NumGet(NumGet(this+0)+5*A_PtrSize), "ptr", this, "ptr", ConnectTo)
}
VA_IConnector_Disconnect(this) {
    return DllCall(NumGet(NumGet(this+0)+6*A_PtrSize), "ptr", this)
}
VA_IConnector_IsConnected(this, ByRef Connected) {
    return DllCall(NumGet(NumGet(this+0)+7*A_PtrSize), "ptr", this, "int*", Connected)
}
VA_IConnector_GetConnectedTo(this, ByRef ConTo) {
    return DllCall(NumGet(NumGet(this+0)+8*A_PtrSize), "ptr", this, "ptr*", ConTo)
}
VA_IConnector_GetConnectorIdConnectedTo(this, ByRef ConnectorId) {
    hr := DllCall(NumGet(NumGet(this+0)+9*A_PtrSize), "ptr", this, "ptr*", ConnectorId)
    VA_WStrOut(ConnectorId)
    return hr
}
VA_IConnector_GetDeviceIdConnectedTo(this, ByRef DeviceId) {
    hr := DllCall(NumGet(NumGet(this+0)+10*A_PtrSize), "ptr", this, "ptr*", DeviceId)
    VA_WStrOut(DeviceId)
    return hr
}

;
; IPart : {AE2DE0E4-5BCA-4F2D-AA46-5D13F8FDB3A9}
;
VA_IPart_GetName(this, ByRef Name) {
    hr := DllCall(NumGet(NumGet(this+0)+3*A_PtrSize), "ptr", this, "ptr*", Name)
    VA_WStrOut(Name)
    return hr
}
VA_IPart_GetLocalId(this, ByRef Id) {
    return DllCall(NumGet(NumGet(this+0)+4*A_PtrSize), "ptr", this, "uint*", Id)
}
VA_IPart_GetGlobalId(this, ByRef GlobalId) {
    hr := DllCall(NumGet(NumGet(this+0)+5*A_PtrSize), "ptr", this, "ptr*", GlobalId)
    VA_WStrOut(GlobalId)
    return hr
}
VA_IPart_GetPartType(this, ByRef PartType) {
    return DllCall(NumGet(NumGet(this+0)+6*A_PtrSize), "ptr", this, "int*", PartType)
}
VA_IPart_GetSubType(this, ByRef SubType) {
    VarSetCapacity(SubType,16,0)
    hr := DllCall(NumGet(NumGet(this+0)+7*A_PtrSize), "ptr", this, "ptr", &SubType)
    VA_GUIDOut(SubType)
    return hr
}
VA_IPart_GetControlInterfaceCount(this, ByRef Count) {
    return DllCall(NumGet(NumGet(this+0)+8*A_PtrSize), "ptr", this, "uint*", Count)
}
VA_IPart_GetControlInterface(this, Index, ByRef InterfaceDesc) {
    return DllCall(NumGet(NumGet(this+0)+9*A_PtrSize), "ptr", this, "uint", Index, "ptr*", InterfaceDesc)
}
VA_IPart_EnumPartsIncoming(this, ByRef Parts) {
    return DllCall(NumGet(NumGet(this+0)+10*A_PtrSize), "ptr", this, "ptr*", Parts)
}
VA_IPart_EnumPartsOutgoing(this, ByRef Parts) {
    return DllCall(NumGet(NumGet(this+0)+11*A_PtrSize), "ptr", this, "ptr*", Parts)
}
VA_IPart_GetTopologyObject(this, ByRef Topology) {
    return DllCall(NumGet(NumGet(this+0)+12*A_PtrSize), "ptr", this, "ptr*", Topology)
}
VA_IPart_Activate(this, ClsContext, iid, ByRef Object) {
    return DllCall(NumGet(NumGet(this+0)+13*A_PtrSize), "ptr", this, "uint", ClsContext, "ptr", VA_GUID(iid), "ptr*", Object)
}
VA_IPart_RegisterControlChangeCallback(this, iid, Notify) {
    return DllCall(NumGet(NumGet(this+0)+14*A_PtrSize), "ptr", this, "ptr", VA_GUID(iid), "ptr", Notify)
}
VA_IPart_UnregisterControlChangeCallback(this, Notify) {
    return DllCall(NumGet(NumGet(this+0)+15*A_PtrSize), "ptr", this, "ptr", Notify)
}

;
; IPartsList : {6DAA848C-5EB0-45CC-AEA5-998A2CDA1FFB}
;
VA_IPartsList_GetCount(this, ByRef Count) {
    return DllCall(NumGet(NumGet(this+0)+3*A_PtrSize), "ptr", this, "uint*", Count)
}
VA_IPartsList_GetPart(this, INdex, ByRef Part) {
    return DllCall(NumGet(NumGet(this+0)+4*A_PtrSize), "ptr", this, "uint", Index, "ptr*", Part)
}

;
; IAudioEndpointVolume : {5CDF2C82-841E-4546-9722-0CF74078229A}
;
VA_IAudioEndpointVolume_RegisterControlChangeNotify(this, Notify) {
    return DllCall(NumGet(NumGet(this+0)+3*A_PtrSize), "ptr", this, "ptr", Notify)
}
VA_IAudioEndpointVolume_UnregisterControlChangeNotify(this, Notify) {
    return DllCall(NumGet(NumGet(this+0)+4*A_PtrSize), "ptr", this, "ptr", Notify)
}
VA_IAudioEndpointVolume_GetChannelCount(this, ByRef ChannelCount) {
    return DllCall(NumGet(NumGet(this+0)+5*A_PtrSize), "ptr", this, "uint*", ChannelCount)
}
VA_IAudioEndpointVolume_SetMasterVolumeLevel(this, LevelDB, GuidEventContext="") {
    return DllCall(NumGet(NumGet(this+0)+6*A_PtrSize), "ptr", this, "float", LevelDB, "ptr", VA_GUID(GuidEventContext))
}
VA_IAudioEndpointVolume_SetMasterVolumeLevelScalar(this, Level, GuidEventContext="") {
    return DllCall(NumGet(NumGet(this+0)+7*A_PtrSize), "ptr", this, "float", Level, "ptr", VA_GUID(GuidEventContext))
}
VA_IAudioEndpointVolume_GetMasterVolumeLevel(this, ByRef LevelDB) {
    return DllCall(NumGet(NumGet(this+0)+8*A_PtrSize), "ptr", this, "float*", LevelDB)
}
VA_IAudioEndpointVolume_GetMasterVolumeLevelScalar(this, ByRef Level) {
    return DllCall(NumGet(NumGet(this+0)+9*A_PtrSize), "ptr", this, "float*", Level)
}
VA_IAudioEndpointVolume_SetChannelVolumeLevel(this, Channel, LevelDB, GuidEventContext="") {
    return DllCall(NumGet(NumGet(this+0)+10*A_PtrSize), "ptr", this, "uint", Channel, "float", LevelDB, "ptr", VA_GUID(GuidEventContext))
}
VA_IAudioEndpointVolume_SetChannelVolumeLevelScalar(this, Channel, Level, GuidEventContext="") {
    return DllCall(NumGet(NumGet(this+0)+11*A_PtrSize), "ptr", this, "uint", Channel, "float", Level, "ptr", VA_GUID(GuidEventContext))
}
VA_IAudioEndpointVolume_GetChannelVolumeLevel(this, Channel, ByRef LevelDB) {
    return DllCall(NumGet(NumGet(this+0)+12*A_PtrSize), "ptr", this, "uint", Channel, "float*", LevelDB)
}
VA_IAudioEndpointVolume_GetChannelVolumeLevelScalar(this, Channel, ByRef Level) {
    return DllCall(NumGet(NumGet(this+0)+13*A_PtrSize), "ptr", this, "uint", Channel, "float*", Level)
}
VA_IAudioEndpointVolume_SetMute(this, Mute, GuidEventContext="") {
    return DllCall(NumGet(NumGet(this+0)+14*A_PtrSize), "ptr", this, "int", Mute, "ptr", VA_GUID(GuidEventContext))
}
VA_IAudioEndpointVolume_GetMute(this, ByRef Mute) {
    return DllCall(NumGet(NumGet(this+0)+15*A_PtrSize), "ptr", this, "int*", Mute)
}
VA_IAudioEndpointVolume_GetVolumeStepInfo(this, ByRef Step, ByRef StepCount) {
    return DllCall(NumGet(NumGet(this+0)+16*A_PtrSize), "ptr", this, "uint*", Step, "uint*", StepCount)
}
VA_IAudioEndpointVolume_VolumeStepUp(this, GuidEventContext="") {
    return DllCall(NumGet(NumGet(this+0)+17*A_PtrSize), "ptr", this, "ptr", VA_GUID(GuidEventContext))
}
VA_IAudioEndpointVolume_VolumeStepDown(this, GuidEventContext="") {
    return DllCall(NumGet(NumGet(this+0)+18*A_PtrSize), "ptr", this, "ptr", VA_GUID(GuidEventContext))
}
VA_IAudioEndpointVolume_QueryHardwareSupport(this, ByRef HardwareSupportMask) {
    return DllCall(NumGet(NumGet(this+0)+19*A_PtrSize), "ptr", this, "uint*", HardwareSupportMask)
}
VA_IAudioEndpointVolume_GetVolumeRange(this, ByRef MinDB, ByRef MaxDB, ByRef IncrementDB) {
    return DllCall(NumGet(NumGet(this+0)+20*A_PtrSize), "ptr", this, "float*", MinDB, "float*", MaxDB, "float*", IncrementDB)
}

;
; IPerChannelDbLevel  : {C2F8E001-F205-4BC9-99BC-C13B1E048CCB}
;   IAudioVolumeLevel : {7FB7B48F-531D-44A2-BCB3-5AD5A134B3DC}
;   IAudioBass        : {A2B1A1D9-4DB3-425D-A2B2-BD335CB3E2E5}
;   IAudioMidrange    : {5E54B6D7-B44B-40D9-9A9E-E691D9CE6EDF}
;   IAudioTreble      : {0A717812-694E-4907-B74B-BAFA5CFDCA7B}
;
VA_IPerChannelDbLevel_GetChannelCount(this, ByRef Channels) {
    return DllCall(NumGet(NumGet(this+0)+3*A_PtrSize), "ptr", this, "uint*", Channels)
}
VA_IPerChannelDbLevel_GetLevelRange(this, Channel, ByRef MinLevelDB, ByRef MaxLevelDB, ByRef Stepping) {
    return DllCall(NumGet(NumGet(this+0)+4*A_PtrSize), "ptr", this, "uint", Channel, "float*", MinLevelDB, "float*", MaxLevelDB, "float*", Stepping)
}
VA_IPerChannelDbLevel_GetLevel(this, Channel, ByRef LevelDB) {
    return DllCall(NumGet(NumGet(this+0)+5*A_PtrSize), "ptr", this, "uint", Channel, "float*", LevelDB)
}
VA_IPerChannelDbLevel_SetLevel(this, Channel, LevelDB, GuidEventContext="") {
    return DllCall(NumGet(NumGet(this+0)+6*A_PtrSize), "ptr", this, "uint", Channel, "float", LevelDB, "ptr", VA_GUID(GuidEventContext))
}
VA_IPerChannelDbLevel_SetLevelUniform(this, LevelDB, GuidEventContext="") {
    return DllCall(NumGet(NumGet(this+0)+7*A_PtrSize), "ptr", this, "float", LevelDB, "ptr", VA_GUID(GuidEventContext))
}
VA_IPerChannelDbLevel_SetLevelAllChannels(this, LevelsDB, ChannelCount, GuidEventContext="") {
    return DllCall(NumGet(NumGet(this+0)+8*A_PtrSize), "ptr", this, "uint", LevelsDB, "uint", ChannelCount, "ptr", VA_GUID(GuidEventContext))
}

;
; IAudioMute : {DF45AEEA-B74A-4B6B-AFAD-2366B6AA012E}
;
VA_IAudioMute_SetMute(this, Muted, GuidEventContext="") {
    return DllCall(NumGet(NumGet(this+0)+3*A_PtrSize), "ptr", this, "int", Muted, "ptr", VA_GUID(GuidEventContext))
}
VA_IAudioMute_GetMute(this, ByRef Muted) {
    return DllCall(NumGet(NumGet(this+0)+4*A_PtrSize), "ptr", this, "int*", Muted)
}

;
; IAudioAutoGainControl : {85401FD4-6DE4-4b9d-9869-2D6753A82F3C}
;
VA_IAudioAutoGainControl_GetEnabled(this, ByRef Enabled) {
    return DllCall(NumGet(NumGet(this+0)+3*A_PtrSize), "ptr", this, "int*", Enabled)
}
VA_IAudioAutoGainControl_SetEnabled(this, Enable, GuidEventContext="") {
    return DllCall(NumGet(NumGet(this+0)+4*A_PtrSize), "ptr", this, "int", Enable, "ptr", VA_GUID(GuidEventContext))
}

;
; IAudioMeterInformation : {C02216F6-8C67-4B5B-9D00-D008E73E0064}
;
VA_IAudioMeterInformation_GetPeakValue(this, ByRef Peak) {
    return DllCall(NumGet(NumGet(this+0)+3*A_PtrSize), "ptr", this, "float*", Peak)
}
VA_IAudioMeterInformation_GetMeteringChannelCount(this, ByRef ChannelCount) {
    return DllCall(NumGet(NumGet(this+0)+4*A_PtrSize), "ptr", this, "uint*", ChannelCount)
}
VA_IAudioMeterInformation_GetChannelsPeakValues(this, ChannelCount, PeakValues) {
    return DllCall(NumGet(NumGet(this+0)+5*A_PtrSize), "ptr", this, "uint", ChannelCount, "ptr", PeakValues)
}
VA_IAudioMeterInformation_QueryHardwareSupport(this, ByRef HardwareSupportMask) {
    return DllCall(NumGet(NumGet(this+0)+6*A_PtrSize), "ptr", this, "uint*", HardwareSupportMask)
}

;
; IAudioClient : {1CB9AD4C-DBFA-4c32-B178-C2F568A703B2}
;
VA_IAudioClient_Initialize(this, ShareMode, StreamFlags, BufferDuration, Periodicity, Format, AudioSessionGuid) {
    return DllCall(NumGet(NumGet(this+0)+3*A_PtrSize), "ptr", this, "int", ShareMode, "uint", StreamFlags, "int64", BufferDuration, "int64", Periodicity, "ptr", Format, "ptr", VA_GUID(AudioSessionGuid))
}
VA_IAudioClient_GetBufferSize(this, ByRef NumBufferFrames) {
    return DllCall(NumGet(NumGet(this+0)+4*A_PtrSize), "ptr", this, "uint*", NumBufferFrames)
}
VA_IAudioClient_GetStreamLatency(this, ByRef Latency) {
    return DllCall(NumGet(NumGet(this+0)+5*A_PtrSize), "ptr", this, "int64*", Latency)
}
VA_IAudioClient_GetCurrentPadding(this, ByRef NumPaddingFrames) {
    return DllCall(NumGet(NumGet(this+0)+6*A_PtrSize), "ptr", this, "uint*", NumPaddingFrames)
}
VA_IAudioClient_IsFormatSupported(this, ShareMode, Format, ByRef ClosestMatch) {
    return DllCall(NumGet(NumGet(this+0)+7*A_PtrSize), "ptr", this, "int", ShareMode, "ptr", Format, "ptr*", ClosestMatch)
}
VA_IAudioClient_GetMixFormat(this, ByRef Format) {
    return DllCall(NumGet(NumGet(this+0)+8*A_PtrSize), "ptr", this, "uint*", Format)
}
VA_IAudioClient_GetDevicePeriod(this, ByRef DefaultDevicePeriod, ByRef MinimumDevicePeriod) {
    return DllCall(NumGet(NumGet(this+0)+9*A_PtrSize), "ptr", this, "int64*", DefaultDevicePeriod, "int64*", MinimumDevicePeriod)
}
VA_IAudioClient_Start(this) {
    return DllCall(NumGet(NumGet(this+0)+10*A_PtrSize), "ptr", this)
}
VA_IAudioClient_Stop(this) {
    return DllCall(NumGet(NumGet(this+0)+11*A_PtrSize), "ptr", this)
}
VA_IAudioClient_Reset(this) {
    return DllCall(NumGet(NumGet(this+0)+12*A_PtrSize), "ptr", this)
}
VA_IAudioClient_SetEventHandle(this, eventHandle) {
    return DllCall(NumGet(NumGet(this+0)+13*A_PtrSize), "ptr", this, "ptr", eventHandle)
}
VA_IAudioClient_GetService(this, iid, ByRef Service) {
    return DllCall(NumGet(NumGet(this+0)+14*A_PtrSize), "ptr", this, "ptr", VA_GUID(iid), "ptr*", Service)
}

;
; IAudioSessionControl : {F4B1A599-7266-4319-A8CA-E70ACB11E8CD}
;
/*
AudioSessionStateInactive = 0
AudioSessionStateActive = 1
AudioSessionStateExpired = 2
*/
VA_IAudioSessionControl_GetState(this, ByRef State) {
    return DllCall(NumGet(NumGet(this+0)+3*A_PtrSize), "ptr", this, "int*", State)
}
VA_IAudioSessionControl_GetDisplayName(this, ByRef DisplayName) {
    hr := DllCall(NumGet(NumGet(this+0)+4*A_PtrSize), "ptr", this, "ptr*", DisplayName)
    VA_WStrOut(DisplayName)
    return hr
}
VA_IAudioSessionControl_SetDisplayName(this, DisplayName, EventContext) {
    return DllCall(NumGet(NumGet(this+0)+5*A_PtrSize), "ptr", this, "wstr", DisplayName, "ptr", VA_GUID(EventContext))
}
VA_IAudioSessionControl_GetIconPath(this, ByRef IconPath) {
    hr := DllCall(NumGet(NumGet(this+0)+6*A_PtrSize), "ptr", this, "ptr*", IconPath)
    VA_WStrOut(IconPath)
    return hr
}
VA_IAudioSessionControl_SetIconPath(this, IconPath) {
    return DllCall(NumGet(NumGet(this+0)+7*A_PtrSize), "ptr", this, "wstr", IconPath)
}
VA_IAudioSessionControl_GetGroupingParam(this, ByRef Param) {
    VarSetCapacity(Param,16,0)
    hr := DllCall(NumGet(NumGet(this+0)+8*A_PtrSize), "ptr", this, "ptr", &Param)
    VA_GUIDOut(Param)
    return hr
}
VA_IAudioSessionControl_SetGroupingParam(this, Param, EventContext) {
    return DllCall(NumGet(NumGet(this+0)+9*A_PtrSize), "ptr", this, "ptr", VA_GUID(Param), "ptr", VA_GUID(EventContext))
}
VA_IAudioSessionControl_RegisterAudioSessionNotification(this, NewNotifications) {
    return DllCall(NumGet(NumGet(this+0)+10*A_PtrSize), "ptr", this, "ptr", NewNotifications)
}
VA_IAudioSessionControl_UnregisterAudioSessionNotification(this, NewNotifications) {
    return DllCall(NumGet(NumGet(this+0)+11*A_PtrSize), "ptr", this, "ptr", NewNotifications)
}

;
; IAudioSessionManager : {BFA971F1-4D5E-40BB-935E-967039BFBEE4}
;
VA_IAudioSessionManager_GetAudioSessionControl(this, AudioSessionGuid) {
    return DllCall(NumGet(NumGet(this+0)+3*A_PtrSize), "ptr", this, "ptr", VA_GUID(AudioSessionGuid))
}
VA_IAudioSessionManager_GetSimpleAudioVolume(this, AudioSessionGuid, StreamFlags, ByRef AudioVolume) {
    return DllCall(NumGet(NumGet(this+0)+4*A_PtrSize), "ptr", this, "ptr", VA_GUID(AudioSessionGuid), "uint", StreamFlags, "uint*", AudioVolume)
}

;
; IMMDeviceEnumerator
;
VA_IMMDeviceEnumerator_EnumAudioEndpoints(this, DataFlow, StateMask, ByRef Devices) {
    return DllCall(NumGet(NumGet(this+0)+3*A_PtrSize), "ptr", this, "int", DataFlow, "uint", StateMask, "ptr*", Devices)
}
VA_IMMDeviceEnumerator_GetDefaultAudioEndpoint(this, DataFlow, Role, ByRef Endpoint) {
    return DllCall(NumGet(NumGet(this+0)+4*A_PtrSize), "ptr", this, "int", DataFlow, "int", Role, "ptr*", Endpoint)
}
VA_IMMDeviceEnumerator_GetDevice(this, id, ByRef Device) {
    return DllCall(NumGet(NumGet(this+0)+5*A_PtrSize), "ptr", this, "wstr", id, "ptr*", Device)
}
VA_IMMDeviceEnumerator_RegisterEndpointNotificationCallback(this, Client) {
    return DllCall(NumGet(NumGet(this+0)+6*A_PtrSize), "ptr", this, "ptr", Client)
}
VA_IMMDeviceEnumerator_UnregisterEndpointNotificationCallback(this, Client) {
    return DllCall(NumGet(NumGet(this+0)+7*A_PtrSize), "ptr", this, "ptr", Client)
}

;
; IMMDeviceCollection
;
VA_IMMDeviceCollection_GetCount(this, ByRef Count) {
    return DllCall(NumGet(NumGet(this+0)+3*A_PtrSize), "ptr", this, "uint*", Count)
}
VA_IMMDeviceCollection_Item(this, Index, ByRef Device) {
    return DllCall(NumGet(NumGet(this+0)+4*A_PtrSize), "ptr", this, "uint", Index, "ptr*", Device)
}

;
; IControlInterface
;
VA_IControlInterface_GetName(this, ByRef Name) {
    hr := DllCall(NumGet(NumGet(this+0)+3*A_PtrSize), "ptr", this, "ptr*", Name)
    VA_WStrOut(Name)
    return hr
}
VA_IControlInterface_GetIID(this, ByRef IID) {
    VarSetCapacity(IID,16,0)
    hr := DllCall(NumGet(NumGet(this+0)+4*A_PtrSize), "ptr", this, "ptr", &IID)
    VA_GUIDOut(IID)
    return hr
}


/*
    INTERFACES REQUIRING WINDOWS 7 / SERVER 2008 R2
*/

;
; IAudioSessionControl2 : {bfb7ff88-7239-4fc9-8fa2-07c950be9c6d}
;   extends IAudioSessionControl
;
VA_IAudioSessionControl2_GetSessionIdentifier(this, ByRef id) {
    hr := DllCall(NumGet(NumGet(this+0)+12*A_PtrSize), "ptr", this, "ptr*", id)
    VA_WStrOut(id)
    return hr
}
VA_IAudioSessionControl2_GetSessionInstanceIdentifier(this, ByRef id) {
    hr := DllCall(NumGet(NumGet(this+0)+13*A_PtrSize), "ptr", this, "ptr*", id)
    VA_WStrOut(id)
    return hr
}
VA_IAudioSessionControl2_GetProcessId(this, ByRef pid) {
    return DllCall(NumGet(NumGet(this+0)+14*A_PtrSize), "ptr", this, "uint*", pid)
}
VA_IAudioSessionControl2_IsSystemSoundsSession(this) {
    return DllCall(NumGet(NumGet(this+0)+15*A_PtrSize), "ptr", this)
}
VA_IAudioSessionControl2_SetDuckingPreference(this, OptOut) {
    return DllCall(NumGet(NumGet(this+0)+16*A_PtrSize), "ptr", this, "int", OptOut)
}

;
; IAudioSessionManager2 : {77AA99A0-1BD6-484F-8BC7-2C654C9A9B6F}
;   extends IAudioSessionManager
;
VA_IAudioSessionManager2_GetSessionEnumerator(this, ByRef SessionEnum) {
    return DllCall(NumGet(NumGet(this+0)+5*A_PtrSize), "ptr", this, "ptr*", SessionEnum)
}
VA_IAudioSessionManager2_RegisterSessionNotification(this, SessionNotification) {
    return DllCall(NumGet(NumGet(this+0)+6*A_PtrSize), "ptr", this, "ptr", SessionNotification)
}
VA_IAudioSessionManager2_UnregisterSessionNotification(this, SessionNotification) {
    return DllCall(NumGet(NumGet(this+0)+7*A_PtrSize), "ptr", this, "ptr", SessionNotification)
}
VA_IAudioSessionManager2_RegisterDuckNotification(this, SessionNotification) {
    return DllCall(NumGet(NumGet(this+0)+8*A_PtrSize), "ptr", this, "ptr", SessionNotification)
}
VA_IAudioSessionManager2_UnregisterDuckNotification(this, SessionNotification) {
    return DllCall(NumGet(NumGet(this+0)+9*A_PtrSize), "ptr", this, "ptr", SessionNotification)
}

;
; IAudioSessionEnumerator : {E2F5BB11-0570-40CA-ACDD-3AA01277DEE8}
;
VA_IAudioSessionEnumerator_GetCount(this, ByRef SessionCount) {
    return DllCall(NumGet(NumGet(this+0)+3*A_PtrSize), "ptr", this, "int*", SessionCount)
}
VA_IAudioSessionEnumerator_GetSession(this, SessionCount, ByRef Session) {
    return DllCall(NumGet(NumGet(this+0)+4*A_PtrSize), "ptr", this, "int", SessionCount, "ptr*", Session)
}


/*
    UNDOCUMENTED INTERFACES
*/

; Thanks to Dave Amenta for publishing this interface - http://goo.gl/6L93L
; IID := "{568b9108-44bf-40b4-9006-86afe5b5a620}"
; CLSID := "{294935CE-F637-4E7C-A41B-AB255460B862}"
VA_xIPolicyConfigVista_SetDefaultEndpoint(this, DeviceId, Role) {
    return DllCall(NumGet(NumGet(this+0)+12*A_PtrSize), "ptr", this, "wstr", DeviceId, "int", Role)
}