Build native plugin to get ntp time of audio data

Unity Engine
,
1

Package version
Render Streaming 3.1.0-exp.6
WebRTC 3.0.0-pre.4
Environment
OS windows11
unity version 2021.3.9
Android 13
Question
I tried to get the ntp time of audio data on the receiving end, and I follow the README to custom native plugin. We have test the official webrtc example, It seems feasible to obtain ntp time using the PullRenderData function.
I built the new native plugin to get ntp time on windows and android. However, the value of the ntp time get from PullrenderData was always -1 when I run Bidirectional on the windows, and it became elapsed time when I change the platfrom to android. I don’t know how the PullRenderData is implemented，since unity.webrtc is using a compiled static library of webrtc. My questions are as follows.
a. Have you modified the webrtc source code?
b. Is it possible to replace your static library files(webrtc.lib/ libwebrtc.aar) with our own compiled ones?

I’m sorry if I didn’t make my point clearly. I would love to hear other options to get ntp time of audio data.

2

a. We put patch files for libwebrtc on GitHub repository.
https://github.com/Unity-Technologies/com.unity.webrtc/tree/main/BuildScripts~/patches

b. Yes, but you need to install a package from local folder.
https://docs.unity3d.com/Manual/upm-ui-local.html

I would like to know why you want to use ntp time. If it is useful for every developers, we can add the plan to support the feature.

3

Thank you for your reply. I use data channel to transmit avatar data, and I need to synchronize audio with avatar using ntp time.

4

I am very interested in your topic.
If you achieved your project, please share us.