Debugging WebRTC Audio Playback Latency on OpenHarmony 5.0: ArkWeb, AudioRenderer Underrun, and Native SDK Comparison

This case happened in a WebRTC call running inside nweb / ArkWeb on an OpenHarmony 5.0 device. The peer side was Chrome, and the call could be established normally. The OpenHarmony side was also receiving audio data, but playback was clearly wrong: speech became choppy, delayed audio kept accumulating, and the user experience turned into &ldquo;the peer finishes speaking, then the device plays it…