[AudioGraph] If LowestLatency is specified, it cannot follow changes in the default audio device.

SHi 21

I set QuantumSizeSelectionMode.LowestLatency in AudioGraphSettings by looking here.
In this case, changing the default audio device will not be followed.
So I have to discard and reload the AudioGraph and all input files.

Is this a bug?

Roy Li - MSFT 31,551 Reputation points Microsoft Vendor

2021-09-24T08:07:55.14+00:00

First of all, are you developing a UWP app using AudioGraph API?
SHi 21 Reputation points

2021-09-24T13:03:25.357+00:00

It uses the AudioGraph API and is developed with the Windows App SDK.
However, I was able to reproduce it by setting LowerLatency in scenario 1 of the AudioGraph sample.
Roy Li - MSFT 31,551 Reputation points Microsoft Vendor

2021-09-27T07:47:30.047+00:00

Could you please tell me the detailed steps about how do you reproduce this? What's the expected behavior you want to get and what's the behavior you are getting now?
SHi 21 Reputation points

2021-09-27T14:10:49.737+00:00
ok.
Environment is windows version 2004, visual studio2019 16.11.3.
I checked by switching between Bluetooth headphones and the computer's built-in speakers.

Download and extract the sample and open the file \cs\AudioCreation.sln in it.
Find and open Scenario1_FilePlayback.xaml.cs in Solution Explorer.
(If you get a lot of errors, please build it once.)

Insert

settings.QuantumSizeSelectionMode = QuantumSizeSelectionMode.LowestLatency;

between lines 179 and 180.
Build and run.

Click "Load File" under "1)File Playback" and select the audio file you want.
Click "Start Graph" to play the file.
During playback, switch the playback device in windows.

Expected behavior: The sound will be played on the device you switched to.
Current behavior: The sound continues to play on the original device.
Roy Li - MSFT 31,551 Reputation points Microsoft Vendor

2021-09-28T05:57:17.677+00:00

Thank you for the detailed information. I'll consult the team to see if this behavior is expected or not.
Roy Li - MSFT 31,551 Reputation points Microsoft Vendor

2021-10-22T10:02:50.747+00:00

@SHi Our team is curious about what you are doing in your own app. Why will you meed this issue? What your application actually is? We want to get more information about your real scenario.
SHi 21 Reputation points

2021-10-23T07:04:50.6+00:00

The reason is that my application runs in the background, and if it doesn't keep up with changes in the audio device, it will confuse the user.

My application is to add sound effects to key up/down and mouse clicks.
I want the sound effects to play with the lowest possible latency.
Since I want this application to run at any time, I expect it to start at the same time as Windows startup and run in the system tray without bringing up a window.

Accepted answer

Roy Li - MSFT 31,551 Reputation points Microsoft Vendor

2021-10-27T05:50:03.76+00:00

Hello,

Welcome to Microsoft Q&A!

@SHi After talking to the team. we could confirm this behavior is by design. When you ask for low latency, then you are tied to a device, switching devices won't make the setting carry over or apply to a new device. Now the problem is, did you actually meet any problems when using the standard latency in your app? If not, then the standard latency will be enough.

Thank you.

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SHi 21 Reputation points

2021-10-31T06:10:49.46+00:00

Thank you for confirming this.
For standard latency, there is no problem.
However, for the sound effects related to the input, it would be better to play them with low latency, so I will try to find another workaround.

Roy Li - MSFT 31,551 Reputation points Microsoft Vendor

2021-11-02T08:31:35.66+00:00

Ok. Since the LowestLatency is not suitable for your scenario, you could still use standard latency. And if you have other problems with using standard latency. You could open a support ticket for this. Please contact our paid phone support at MS Support. You will get 1:1 support on that. Please kindly note that your support ticket will be free if it is Microsoft's issue
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[AudioGraph] If LowestLatency is specified, it cannot follow changes in the default audio device.

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