Audio-Video-Synchronization | FFMpeg 处理音视频同步的过程分析 | Android library

So prior to this API, you would use AudioTrack.getPlaybackHeadPosition() which was just an approximation. Thus, to account for latency you had to offset that value with a latency value from one of two hidden methods: AudioManager.getOutputLatency() or AudioTrack.getLatency().

With the new AudioTrack.getTimestamp() API, you get a snapshot of the playhead position at a given time, taken directly at the output. As such, it is fully accurate and already accounts for device latency. Thus there's no need to call any other APIs now to add/remove latency.

The caveat is that this timestamp is only a snapshot, and the docs recommend you don't call this new method very often. So the trick to getting the "current" position is to use your last snapshot and linearly interpolate what the current value should be: