The audio buffer ready signal sent by the Windows system cannot be received.

峰景 1

I implemented a softphone using the CoreAudio framework, but recently had a problem with the latest version of win10, When the IAudioClient::SetEventHandle interface is invoked to set the event handle, there is a possibility that the audio buffer ready signal from the system cannot be received during a call. I call the WaitForMultipleObjects interface to wait for the signal. After receiving no signal, no sound occurs in the call. As a result, I cannot obtain the media packets collected by the audio device.

This phenomenon persists until the call ends. and then I cannot release the audio client by invoking the IAudioClient::Release interface. The system interface does not return any result.

Does anyone encounter this problem?

system version: Win 10 pro 64bit 21H2, OS build: 19044.1586

However, this problem does not occur in the version.Win10 enterprise edition64-bit version 2004 os build 19041.1110.

Who can help look at the question?

Xiaopo Yang - MSFT 11,336 Reputation points Microsoft Vendor

2022-09-09T06:26:45.837+00:00

Could you please show a minimal, reproducible sample without private information? Or Can you reproduce using one of these sample?
Does this behavior happen on other OS build? I cannot reproduce on OS build 19044.1889 using Application loopback API Capture Sample.
峰景 1 Reputation point

2022-09-09T13:55:12.357+00:00

We use C++ interface. The invoking method is as follows:
hr = IAudioClient_SetEventHandle(_ptrClientIn, _hCaptureSamplesReadyEvent);

This method is invoked during the initialization process，After this, the process of invoking the interface for waiting for the system to send signals and collect media packet data is as follows:
Xiaopo Yang - MSFT 11,336 Reputation points Microsoft Vendor

2022-09-13T01:27:33.837+00:00

Sorry, I know what you say but could you please show a minimal, reproducible sample without private information?
峰景 1 Reputation point

2022-09-13T06:52:58.273+00:00

I'm sorry, As a result of the Company's regulations, I couldn't upload any kind of code, even a simplified sample.
May I show you some code screenshots?
Xiaopo Yang - MSFT 11,336 Reputation points Microsoft Vendor

2022-09-13T07:50:02.357+00:00

Now that, Can you reproduce using one of these sample with noting possible changes?
峰景 1 Reputation point

2022-09-13T11:40:00.107+00:00

This problem occurs only once in a while. The probability of this problem is low. In addition, this problem does not occur in other projects. In the lab environment, the problem does not recur when the same Windows 10 operating system is used.
After a normal call for a period of time, the softphone suddenly cannot receive the signal indicating that the audio buffer is ready from the operating system. Can you analyze the operating system logs to determine why the system suddenly stops sending signals? Even if our program is modified by referring to the sample code, we cannot perform the test in the customer's environment. Currently, the problem recurs only in the customer's environment.
Are you Chinese? Can I communicate with you in Chinese?
Xiaopo Yang - MSFT 11,336 Reputation points Microsoft Vendor

2022-09-14T01:53:23.607+00:00

As this issue is complex, please open an incident via 'Contact us' tab at link below so that our engineer can work with you closely:
https://developer.microsoft.com/en-us/windows/support/ and Please choose the 'Technical Support - Coding/Debugging' for Windows SDK for this issue. In-addition, if the support engineer determines that the issue is the result of a bug the service request will be a no-charge case and you won't be charged.