add 4.2.0 to CHANGELOG

Device enumeration

CHANGELOG.md

@@ -9,6 +9,22 @@ Before any major/minor/patch is released all unit tests will be run to verify th
 
 ## [Unreleased] These changes have not been added to PSGallery yet
 
+## [4.2.0] - 2026-03-15
+
+### Added
+
+- New Remote methods for device enumeration:
+  - GetInputCount()
+  - GetOutputCount()
+  - GetInputDevice($index)
+  - GetOutputDevice($index)
+
+- New IODevice property `driver` to get the driver type of the current device (e.g. 'wdm', 'mme', etc.)
+
+- New IODevice methods to get, set, or clear the current device for a strip or bus:
+  - Get(): returns a PSObject with properties Driver, Name, HardwareId, and IsOutput
+  - Set($device): accepts a PSObject with properties Driver, Name, and IsOutput
+  - Clear()
 
 ## [4.1.0] - 2025-12-23
 

README.md

@@ -368,20 +368,32 @@ $vmr.bus[0].FadeBy(-10, 500)
 The following Strip.device | Bus.device properties are available:
 
 - name: string
+- driver: string
 - sr: int
 - wdm: string
 - ks: string
 - mme: string
 - asio: string
 
+The following Strip.device | Bus.device methods are available:
+
+- Set($device) : PSObject, where device is a PSObject with properties Driver, Name, and IsOutput
+- Get() : PSObject, returns a PSObject with properties Driver, Name, HardwareId, and IsOutput
+- Clear() : Clears the currently selected device
+
 for example:
 
 ```powershell
 $vmr.strip[0].device.wdm = "Mic|Line|Instrument 1 (Audient EVO4)"
 $vmr.bus[0].device.name | Write-Host
+
+$device = $vmr.strip[3].device.Get()
+$vmr.strip[1].device.Set($device)    # moves the device selected for strip 4 to strip 2
+
+$vmr.bus[2].device.Clear()
 ```
 
-name, sr are defined as read only.
+name, driver, sr are defined as read only.
 wdm, ks, mme, asio are defined as write only.
 asio only defined for Bus[0].Device
 
@@ -793,6 +805,21 @@ Access to lower level polling functions are provided with these functions:
 - `$vmr.PDirty`: Returns true if a parameter has been updated.
 - `$vmr.MDirty`: Returns true if a macrobutton has been updated.
 
+Access to lower level device enumeration functions are provided with these functions:
+
+- `$vmr.GetInputCount()`: Returns the number of available input devices.
+- `$vmr.GetOutputCount()`: Returns the number of available output devices.
+- `$vmr.GetInputDevice($index)`: Returns a PSObject with properties Driver, Name, HardwareId, and IsOutput for the input device at the given index.
+- `$vmr.GetOutputDevice($index)`: Returns a PSObject with properties Driver, Name, HardwareId, and IsOutput for the output device at the given index.
+
+```powershell
+$count = $vmr.GetInputCount()
+for ($i = 0; $i -lt $count; $i++) {
+    $device = $vmr.GetInputDevice($i)
+    Write-Host "Input Device $i: $($device.Driver) - $($device.Name)"
+}
+```
+
 ### Errors
 
 - `VMRemoteError`: Base custom error class.

lib/Voicemeeter.psm1

@@ -75,6 +75,22 @@ class Remote {
     [void] PDirty() { P_Dirty }
 
     [void] MDirty() { M_Dirty }
+
+    [int] GetOutputCount() {
+        return Device_Count -IS_OUT $true
+    }
+
+    [int] GetInputCount() {
+        return Device_Count
+    }
+
+    [PSObject] GetOutputDevice([int]$index) {
+        return Device_Desc -INDEX $index -IS_OUT $true
+    }
+
+    [PSObject] GetInputDevice([int]$index) {
+        return Device_Desc -INDEX $index
+    }
 }
 
 class RemoteBasic : Remote {

lib/base.ps1

@@ -226,3 +226,58 @@ function Get_Level {
     }
     [float]$ptr
 }
+
+function Device_Count {
+    param(
+        [bool]$IS_OUT = $false
+    )
+    if ($IS_OUT) {
+        $retval = [int][Voicemeeter.Remote]::VBVMR_Output_GetDeviceNumber()
+        if ($retval -lt 0) { 
+            throw [CAPIError]::new($retval, 'VBVMR_Output_GetDeviceNumber') 
+        }
+    }
+    else {
+        $retval = [int][Voicemeeter.Remote]::VBVMR_Input_GetDeviceNumber()
+        if ($retval -lt 0) { 
+            throw [CAPIError]::new($retval, 'VBVMR_Input_GetDeviceNumber') 
+        }
+    }
+    $retval
+}
+
+function Device_Desc {
+    param(
+        [int]$INDEX, [bool]$IS_OUT = $false
+    )
+    $driver = 0
+    $name = [System.Byte[]]::new(512)
+    $hardwareid = [System.Byte[]]::new(512)
+
+    if ($IS_OUT) {
+        $retval = [int][Voicemeeter.Remote]::VBVMR_Output_GetDeviceDescA($INDEX, [ref]$driver, $name, $hardwareid)
+        if ($retval -notin @(0)) { 
+            throw [CAPIError]::new($retval, 'VBVMR_Output_GetDeviceDescA') 
+        }
+    }
+    else {
+        $retval = [int][Voicemeeter.Remote]::VBVMR_Input_GetDeviceDescA($INDEX, [ref]$driver, $name, $hardwareid)
+        if ($retval -notin @(0)) { 
+            throw [CAPIError]::new($retval, 'VBVMR_Input_GetDeviceDescA') 
+        }
+    }
+
+    $drivers = @{
+        1 = 'mme'
+        3 = 'wdm'
+        4 = 'ks'
+        5 = 'asio'
+    }
+
+    [PSCustomObject]@{
+        Driver     = $drivers[$driver]
+        Name       = [System.Text.Encoding]::ASCII.GetString($name).Trim([char]0)
+        HardwareId = [System.Text.Encoding]::ASCII.GetString($hardwareid).Trim([char]0)
+        IsOutput   = $IS_OUT
+    }
+}

lib/binding.ps1

@@ -43,6 +43,15 @@ function Setup_DLL {
 
     [DllImport(@"$dll")]
     public static extern int VBVMR_GetLevel(Int64 mode, Int64 index, ref float ptr);
+
+    [DllImport(@"$dll")]
+    public static extern int VBVMR_Output_GetDeviceNumber();
+    [DllImport(@"$dll")]
+    public static extern int VBVMR_Input_GetDeviceNumber();
+    [DllImport(@"$dll")]
+    public static extern int VBVMR_Output_GetDeviceDescA(Int64 index, ref int type, byte[] name, byte[] hardwareid);
+    [DllImport(@"$dll")]
+    public static extern int VBVMR_Input_GetDeviceDescA(Int64 index, ref int type, byte[] name, byte[] hardwareid);
 "@
 
     Add-Type -MemberDefinition $Signature -Name Remote -Namespace Voicemeeter -PassThru | Out-Null

lib/bus.ps1

@@ -97,7 +97,7 @@ class VirtualBus : Bus {
 }
 
 class BusDevice : IODevice {
-    BusDevice ([int]$index, [Object]$remote) : base ($index, $remote) {
+    BusDevice ([int]$index, [Object]$remote) : base ($index, $remote, 'Output') {
         if ($this.index -eq 0) {
             AddStringMembers -PARAMS @('asio') -WriteOnly
         }
@@ -106,6 +106,14 @@ class BusDevice : IODevice {
     [string] identifier () {
         return 'Bus[' + $this.index + '].Device'
     }
+
+    [int] EnumCount () {
+        return $this.remote.GetOutputCount()
+    }
+
+    [PSObject] EnumDevice ([int]$eIndex) {
+        return $this.remote.GetOutputDevice($eIndex)
+    }
 }
 
 function Make_Buses ([Object]$remote) {

lib/io.ps1

@@ -100,9 +100,123 @@ class EqCell : IRemote {
 }
 
 class IODevice : IRemote {
-    IODevice ([int]$index, [Object]$remote) : base ($index, $remote) {
+    [string]$kindOfDevice
+    [Hashtable]$drivers
+    
+    IODevice ([int]$index, [Object]$remote, [string]$kindOfDevice) : base ($index, $remote) {
+        $this.kindOfDevice = $kindOfDevice
+        
         AddStringMembers -WriteOnly -PARAMS @('wdm', 'ks', 'mme')
         AddStringMembers -ReadOnly -PARAMS @('name')
         AddIntMembers -ReadOnly -PARAMS @('sr')
+
+        $this.drivers = @{
+            '1'   = 'mme'
+            '4'   = 'wdm'
+            '8'   = 'ks'
+            '256' = 'asio'
+        }
     }
+
+    [int] EnumCount () {
+        throw [System.NotImplementedException]::new("$($this.GetType().Name) must override EnumCount()")
+    }
+
+    [PSObject] EnumDevice ([int]$eIndex) {
+        throw [System.NotImplementedException]::new("$($this.GetType().Name) must override EnumDevice()")
+    }
+
+    [PSObject] Get () {
+        $device = [PSCustomObject]@{
+            Driver     = $this.driver
+            Name       = $this.name
+            HardwareId = ''
+            IsOutput   = $this.kindOfDevice -eq 'Output'
+        }
+        if (-not [string]::IsNullOrEmpty($device.Name)) {
+            for ($i = 0; $i -lt $this.EnumCount(); $i++) {
+                $eDevice = $this.EnumDevice($i)
+                if ($eDevice.Name -eq $device.Name -and $eDevice.Driver -eq $device.Driver) {
+                    $device = $eDevice
+                    break
+                }
+            }
+        }
+        return $device
+    }
+
+    [void] Set ([PSObject]$device) {
+        $required = 'IsOutput', 'Driver', 'Name'
+        $missing = $required | Where-Object { $null -eq $device.PSObject.Properties[$_] }
+
+        if ($missing) {
+            throw [System.ArgumentException]::new(("Invalid device object. Missing member(s): {0}" -f ($missing -join ', ')), 'device')
+        }
+
+        $expectsOutput = ($this.kindOfDevice -eq 'Output')
+        if ([bool]$device.IsOutput -ne $expectsOutput) {
+            throw [System.ArgumentException]::new(("Device direction mismatch. Expected IsOutput={0}." -f $expectsOutput), 'device')
+        }
+
+        $d = $device.Driver
+        $n = $device.Name
+
+        if (-not ($d -is [string])) {
+            throw [System.ArgumentException]::new('Invalid device object. Driver must be a string.', 'device')
+        }
+        if (-not ($n -is [string])) {
+            throw [System.ArgumentException]::new('Invalid device object. Name must be a string.', 'device')
+        }
+
+        if ($d -eq '' -and $n -eq '') { $this.Clear(); return }
+        if ($d -notin $this.drivers.Values) {
+            throw [System.ArgumentOutOfRangeException]::new('device.Driver', $d, 'Invalid device driver provided to Set method.')
+        }
+
+        $this.Setter($d, $n)
+    }
+
+    [void] Clear () {
+        $this.Setter('mme', '')
+    }
+
+    hidden $_driver = $($this | Add-Member ScriptProperty 'driver' `
+        {
+            if ([string]::IsNullOrEmpty($this.name)) { return '' }
+            
+            $type = $null
+            try {
+                $tmp = [System.IO.Path]::Combine([System.IO.Path]::GetTempPath(), "vmrtmp-$(New-Guid).xml")
+                $this.remote.Setter('Command.Save', $tmp)
+
+                $timeout = New-TimeSpan -Seconds 2
+                $sw = [Diagnostics.Stopwatch]::StartNew()
+                $line = $null
+                do {
+                    if (Test-Path $tmp) {
+                        try {
+                            $line = Get-Content $tmp | Select-String -Pattern "<$($this.kindOfDevice)Dev index='$($this.index + 1)'" -List
+                            if ($line) { break }
+                        }
+                        catch {}
+                    }
+                    Start-Sleep -Milliseconds 20
+                } while ($sw.elapsed -lt $timeout)
+                if ($line -and $line.ToString() -match "type='(?<type>\d+)'") {
+                    $type = $matches['type']
+                }
+            }
+            finally {
+                if (Test-Path $tmp) {
+                    Remove-Item $tmp -Force
+                }
+            }
+
+            if ($type -notin $this.drivers.Keys) { return 'unknown' }
+            return $this.drivers[$type]
+        } `
+        {
+            Write-Warning ("ERROR: $($this.identifier()).driver is read only")
+        }
+    )
 }

lib/strip.ps1

@@ -155,12 +155,20 @@ class StripEq : IOEq {
 }
 
 class StripDevice : IODevice {
-    StripDevice ([int]$index, [Object]$remote) : base ($index, $remote) {
+    StripDevice ([int]$index, [Object]$remote) : base ($index, $remote, 'Input') {
     }
 
     [string] identifier () {
         return 'Strip[' + $this.index + '].Device'
     }
+
+    [int] EnumCount () {
+        return $this.remote.GetInputCount()
+    }
+
+    [PSObject] EnumDevice ([int]$eIndex) {
+        return $this.remote.GetInputDevice($eIndex)
+    }
 }
 
 class VirtualStrip : Strip {

tests/higher.Tests.ps1

@@ -850,24 +850,47 @@ Describe -Tag 'higher', -TestName 'All Higher Tests' {
             @{ Index = $phys_in }
         ) {
             Context 'Device' -ForEach @(
-                @{ Value = 'testInput' }, @{ Value = '' }
+                @{ Driver = 'mme'; Value = 'testMme'; Expected = 'mme' }
+                @{ Driver = 'wdm'; Value = 'testWdm'; Expected = 'wdm' }
+                @{ Driver = 'ks'; Value = 'testKs'; Expected = 'ks' }
+                @{ Driver = 'mme'; Value = ''; Expected = '' }
             ) {
-                It "Should set Strip[$index].Device.wdm" {
+                BeforeEach {
-                    $vmr.strip[$index].device.wdm = $value
+                    $vmr.strip[$index].device.Clear()
                     Start-Sleep -Milliseconds 800
-                    $vmr.strip[$index].device.name | Should -Be $value
                 }
                 
-                It "Should set Strip[$index].Device.ks" {
+                It "Should set Strip[$index].Device.$($driver)" {
-                    $vmr.strip[$index].device.ks = $value
+                    $vmr.strip[$index].device.name | Should -Be ''
+                    $vmr.strip[$index].device.driver | Should -Be ''
+                    
+                    $vmr.strip[$index].device.$($driver) = $value
                     Start-Sleep -Milliseconds 800
                     $vmr.strip[$index].device.name | Should -Be $value
+                    $vmr.strip[$index].device.driver | Should -Be $expected
                 }
 
-                It "Should set Strip[$index].Device.mme" {
+                It "Should set Strip[$index].Device" -ForEach @(
-                    $vmr.strip[$index].device.mme = $value
+                    @{
+                        Clear  = [PSCustomObject]@{ Driver = ''; Name = ''; HardwareId = ''; IsOutput = $false }
+                        Device = [PSCustomObject]@{ Driver = $expected; Name = $value; HardwareId = ''; IsOutput = $false }
+                    }
+                ) {
+                    $initial = $vmr.strip[$index].device.Get()
+                    
+                    $initial.Driver | Should -Be $clear.Driver
+                    $initial.Name | Should -Be $clear.Name
+                    $initial.HardwareId | Should -Be $clear.HardwareId
+                    $initial.IsOutput | Should -Be $clear.IsOutput
+                    
+                    $vmr.strip[$index].device.Set($device)
                     Start-Sleep -Milliseconds 800
-                    $vmr.strip[$index].device.name | Should -Be $value
+                    $result = $vmr.strip[$index].device.Get()
+                    
+                    $result.Driver | Should -Be $device.Driver
+                    $result.Name | Should -Be $device.Name
+                    $result.HardwareId | Should -Be $device.HardwareId
+                    $result.IsOutput | Should -Be $device.IsOutput
                 }
             }
 
@@ -983,24 +1006,47 @@ Describe -Tag 'higher', -TestName 'All Higher Tests' {
             @{ Index = $phys_out }
         ) {
             Context 'Device' -ForEach @(
-                @{ Value = 'testOutput' }, @{ Value = '' }
+                @{ Driver = 'mme'; Value = 'testMme'; Expected = 'mme' }
+                @{ Driver = 'wdm'; Value = 'testWdm'; Expected = 'wdm' }
+                @{ Driver = 'ks'; Value = 'testKs'; Expected = 'ks' }
+                @{ Driver = 'mme'; Value = ''; Expected = '' }
             ) {
-                It "Should set Bus[$index].Device.wdm" {
+                BeforeEach {
-                    $vmr.bus[$index].device.wdm = $value
+                    $vmr.bus[$index].device.Clear()
                     Start-Sleep -Milliseconds 800
-                    $vmr.bus[$index].device.name | Should -Be $value
                 }
                 
-                It "Should set Bus[$index].Device.ks" {
+                It "Should set Bus[$index].Device.$($driver)" {
-                    $vmr.bus[$index].device.ks = $value
+                    $vmr.bus[$index].device.name | Should -Be ''
+                    $vmr.bus[$index].device.driver | Should -Be ''
+                    
+                    $vmr.bus[$index].device.$($driver) = $value
                     Start-Sleep -Milliseconds 800
                     $vmr.bus[$index].device.name | Should -Be $value
+                    $vmr.bus[$index].device.driver | Should -Be $expected
                 }
 
-                It "Should set Bus[$index].Device.mme" {
+                It "Should set Bus[$index].Device" -ForEach @(
-                    $vmr.bus[$index].device.mme = $value
+                    @{
+                        Clear  = [PSCustomObject]@{ Driver = ''; Name = ''; HardwareId = ''; IsOutput = $true }
+                        Device = [PSCustomObject]@{ Driver = $expected; Name = $value; HardwareId = ''; IsOutput = $true }
+                    }
+                ) {
+                    $initial = $vmr.bus[$index].device.Get()
+                    
+                    $initial.Driver | Should -Be $clear.Driver
+                    $initial.Name | Should -Be $clear.Name
+                    $initial.HardwareId | Should -Be $clear.HardwareId
+                    $initial.IsOutput | Should -Be $clear.IsOutput
+                    
+                    $vmr.bus[$index].device.Set($device)
                     Start-Sleep -Milliseconds 800
-                    $vmr.bus[$index].device.name | Should -Be $value
+                    $result = $vmr.bus[$index].device.Get()
+                    
+                    $result.Driver | Should -Be $device.Driver
+                    $result.Name | Should -Be $device.Name
+                    $result.HardwareId | Should -Be $device.HardwareId
+                    $result.IsOutput | Should -Be $device.IsOutput
                 }
             }
         }
@@ -1009,24 +1055,47 @@ Describe -Tag 'higher', -TestName 'All Higher Tests' {
             @{ Index = $virt_out }
         ) {
             Context 'Device' -Skip:$ifNotBasic -ForEach @(
-                @{ Value = 'testOutput' }, @{ Value = '' }
+                @{ Driver = 'mme'; Value = 'testMme'; Expected = 'mme' }
+                @{ Driver = 'wdm'; Value = 'testWdm'; Expected = 'wdm' }
+                @{ Driver = 'ks'; Value = 'testKs'; Expected = 'ks' }
+                @{ Driver = 'mme'; Value = ''; Expected = '' }
             ) {
-                It "Should set Bus[$index].Device.wdm" {
+                BeforeEach {
-                    $vmr.bus[$index].device.wdm = $value
+                    $vmr.bus[$index].device.Clear()
                     Start-Sleep -Milliseconds 800
-                    $vmr.bus[$index].device.name | Should -Be $value
                 }
                 
-                It "Should set Bus[$index].Device.ks" {
+                It "Should set Bus[$index].Device.$($driver)" {
-                    $vmr.bus[$index].device.ks = $value
+                    $vmr.bus[$index].device.name | Should -Be ''
+                    $vmr.bus[$index].device.driver | Should -Be ''
+                    
+                    $vmr.bus[$index].device.$($driver) = $value
                     Start-Sleep -Milliseconds 800
                     $vmr.bus[$index].device.name | Should -Be $value
+                    $vmr.bus[$index].device.driver | Should -Be $expected
                 }
 
-                It "Should set Bus[$index].Device.mme" {
+                It "Should set Bus[$index].Device" -ForEach @(
-                    $vmr.bus[$index].device.mme = $value
+                    @{
+                        Clear  = [PSCustomObject]@{ Driver = ''; Name = ''; HardwareId = ''; IsOutput = $true }
+                        Device = [PSCustomObject]@{ Driver = $expected; Name = $value; HardwareId = ''; IsOutput = $true }
+                    }
+                ) {
+                    $initial = $vmr.bus[$index].device.Get()
+                    
+                    $initial.Driver | Should -Be $clear.Driver
+                    $initial.Name | Should -Be $clear.Name
+                    $initial.HardwareId | Should -Be $clear.HardwareId
+                    $initial.IsOutput | Should -Be $clear.IsOutput
+                    
+                    $vmr.bus[$index].device.Set($device)
                     Start-Sleep -Milliseconds 800
-                    $vmr.bus[$index].device.name | Should -Be $value
+                    $result = $vmr.bus[$index].device.Get()
+                    
+                    $result.Driver | Should -Be $device.Driver
+                    $result.Name | Should -Be $device.Name
+                    $result.HardwareId | Should -Be $device.HardwareId
+                    $result.IsOutput | Should -Be $device.IsOutput
                 }
             }
         }