Get list or Switch audio devices

[askruga]

Hi. Is it possible to:

1.Get a list of audio devices
2.Get current default audio device
3.Change the default device
by your lib?

Or maybe anyone have idea how do this?
Thanks for lib!

[GastonMontiel]

@askruga i need this too

[trajano]

These needs IPolicyConfig. In AutoHotKey it could be implemented as follows.

SetDefaultEndpoint(DeviceID, Role := 3)
{
    ; Undocumented COM-interface IPolicyConfig.
    IPolicyConfig := ComObject("{870AF99C-171D-4F9E-AF0D-E63Df40c2BC9}", "{F8679F50-850A-41CF-9C72-430F290290C8}")
    if (Role & 0x1)
        ComCall(13, IPolicyConfig, "Str", DeviceID, "Int", 0)  ; Default Device
    if (Role & 0x2)
        ComCall(13, IPolicyConfig, "Str", DeviceID, "Int", 2)  ; Default Communication Device
}

Stack overflow https://stackoverflow.com/questions/13054371/programmatically-switch-audio-devices-on-windows-7

Calling COM https://www.oreilly.com/library/view/python-programming-on/1565926218/ch05s02.html

Tried to do it but I can't find the part that allows me to do the two-parameter version ComObject that allows passing in a CLSID and IID in w32com.client

[KillerBOSS2019]

def switchOutput(deviceId, role):
    policy_config = comtypes.CoCreateInstance(
        pc.CLSID_PolicyConfigClient,
        pc.IPolicyConfig,
        comtypes.CLSCTX_ALL
    )
    policy_config.SetDefaultEndpoint(deviceId, role)
    policy_config.Release()

You can change audio devices using this function. You can get list of audio devices using EnumAudioEndpoints. and role arg is from EDataFlow has 4 options, Output/Input/Default/Communications

[tihoangyeudau]

how can I listen event of Switching current default audio device?

[Dearex]

def switchOutput(deviceId, role):
    policy_config = comtypes.CoCreateInstance(
        pc.CLSID_PolicyConfigClient,
        pc.IPolicyConfig,
        comtypes.CLSCTX_ALL
    )
    policy_config.SetDefaultEndpoint(deviceId, role)
    policy_config.Release()

You can change audio devices using this function. You can get list of audio devices using EnumAudioEndpoints. and role arg is from EDataFlow has 4 options, Output/Input/Default/Communications

Hey @KillerBOSS2019
What modules do I need to import for this to work? What is pc?
Thanks!

[thomasrea0113]

def switchOutput(deviceId, role):
    policy_config = comtypes.CoCreateInstance(
        pc.CLSID_PolicyConfigClient,
        pc.IPolicyConfig,
        comtypes.CLSCTX_ALL
    )
    policy_config.SetDefaultEndpoint(deviceId, role)
    policy_config.Release()

You can change audio devices using this function. You can get list of audio devices using EnumAudioEndpoints. and role arg is from EDataFlow has 4 options, Output/Input/Default/Communications

Hey @KillerBOSS2019 What modules do I need to import for this to work? What is pc? Thanks!

Did you figure out what the pc import is supposed to be? This is so close to the exactly solution I need. I'm guessing it's supposed to model the same thing as https://github.com/frgnca/AudioDeviceCmdlets/blob/master/SOURCE/IPolicyConfig.cs, but I can't find those interface types predefined anywhere

[thomasrea0113]

def switchOutput(deviceId, role):
    policy_config = comtypes.CoCreateInstance(
        pc.CLSID_PolicyConfigClient,
        pc.IPolicyConfig,
        comtypes.CLSCTX_ALL
    )
    policy_config.SetDefaultEndpoint(deviceId, role)
    policy_config.Release()

You can change audio devices using this function. You can get list of audio devices using EnumAudioEndpoints. and role arg is from EDataFlow has 4 options, Output/Input/Default/Communications

It would be super helpful if you could throw togother a quick example of how to actually call this method. I can't find interface definitions for IPolicyConfig anywhere

[KillerBOSS2019]

Luckily I have my project open source (: https://github.com/KillerBOSS2019/TouchPortal-Windows-MediaMixer/blob/main/src/audioUtil/policyconfig.py

[KillerBOSS2019]

My project allows me to interface the audio mixer directly, changing individual application output/input and switching global audio devices

[Dearex]

Thanks for the link! I figured out the clsid thing on my own but was stuck at the IPolicyConfig. I'll have a look at your project

[Dearex]

changing individual application output/input

This is exactly what I need 😄

[thomasrea0113]

This is excellent! I had started the process of implementing the IPolicyConfig interface myself and quickly realized it wasn't worth the trouble and resulted to just using this powershell module instead: https://github.com/KillerBOSS2019/TouchPortal-Windows-MediaMixer/tree/main, which meant it wouldn't be a purely python solution. This worked for my purposes perfectly!

[Dearex]

Got it working! Thanks
Two questions:

• Do I need the DLL to change the Device of a single Application or is it possible without?
• How do I set a Application back to "default"?

[tihoangyeudau]

Is there a way to get default audio input device change event from windows for python?

[KillerBOSS2019]

@Dearex 1. I have tried to translate the program into python but no success. The dll is a simplified version of AudioSwitcher program. Basically a minimal required code to get it working.
As for the second question. You will need to do your own research. I have that somewhere just Donno where

[KillerBOSS2019]

Would be cool if you can reference my project if you use part of my project. Not required (: