How do I force AudioProcessing.Raw for audio capture while using the AudioGraph API?

barmaley 0

I tried migrating my old, functional WASAPI code to the AudioGraph API, but ran into difficulty when forcing AudioGraph to capture RAW audio. The system automatically inserts effects like echo cancellation and noise reduction during capture, and it appears there's no way to disable them or force AudioProcessing.Raw mode for a capture stream. Does anyone know a solution?

Castorix31 83,206 Reputation points

2023-10-21T09:45:52.33+00:00

I tested by recording a Youtube video with WASAPI and AudioGraph and I apparently get the same result (PCM, 16-bit, 48000 Hz)

I compared graphs with GoldWave, like :
barmaley 0 Reputation points

2023-10-22T10:11:45.8266667+00:00

Try recording from the device that has the "Enable audio enhancements" checkbox enabled, and then compare the results. With AudioGraph, I am unable to bypass these "enhancements."

Junjie Zhu - MSFT 16,706 Microsoft Vendor

Hi @barmaley

Does this setting meet your needs?

var pcmEncoding = AudioEncodingProperties.CreatePcm(16000, 1, 16);

var result = await AudioGraph.CreateAsync(
    new AudioGraphSettings(AudioRenderCategory.Media)
    {
        DesiredRenderDeviceAudioProcessing = AudioProcessing.Raw,
        AudioRenderCategory = AudioRenderCategory.Media,
        EncodingProperties = pcmEncoding
    });

barmaley 0 Reputation points

2023-10-25T18:30:22.0166667+00:00

No, Junjie, unfortunately, these settings do not remove the AcousticEchoCancellation and NoiseSuppression effects from the capture channel. I guess there was a reason behind the name 'DesiredRenderDeviceAudioProcessing'...
Junjie Zhu - MSFT 16,706 Reputation points Microsoft Vendor

2023-10-26T08:27:54.29+00:00

Hi @barmaley,

Use MMDeviceEnumerator API to cancel Audio Enhancements, and then enable the checkbox of Audio Enhancements after you capture audio. Can this meet your needs?
barmaley 0 Reputation points

2023-10-27T22:58:43.8566667+00:00

Thank you for the idea. It seems like you want me to ruin all my pleasure of working with C# :-)

If this issue cannot be solved using any AudioGraph methods or at least an adequate C# workaround, then I'd be better off sticking with my old WASAPI implementation.

Out of curiosity, I tried using IPolicyConfig to switch the 'Enhancements' property off as suggested in the post you linked. However, it seems that this wouldn't be allowed in the UWP app I'm working on. Here's the error I got:

Creating an instance of the COM component with CLSID {870AF99C-171D-4F9E-AF0D-E63DF40C2BC9} using CoCreateInstanceFromApp failed due to the following error: 80040154 Class not registered (Exception from HRESULT: 0x80040154 (REGDB_E_CLASSNOTREG)). Please ensure that your COM object is in the allowed list of CoCreateInstanceFromApp.
Junjie Zhu - MSFT 16,706 Reputation points Microsoft Vendor

2023-10-30T07:35:35.1933333+00:00

Sorry for that. Currently AudioGraph cannot eliminate the effect of "audio enhancements". If you want to use Win32 API in UWP project, it is recommended that you use Desktop Bridge. For how to use Desktop Bridge in UWP, you can search Stefan Wick's blog "UWP with Desktop Extension" in the browser.

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How do I force AudioProcessing.Raw for audio capture while using the AudioGraph API?