Prerequisites¶
This tutorial assumes that you have:
* Have completed the Basics series or have a basic app using the SDK working.
* Are using the ExoPlayerIntegration module and ExoPlayerTech as player implementation.
Live drift correction (ExoPlayer)¶
This tutorial describes how to use drift correction for live streams when using the ExoPlayerIntegration module.
Typical usage¶
Add a DriftCorrector to ExoPlayerTech.
exoPlayerTech.addDriftListener(new DriftCorrector());
Live streams will now be automatically keep their initial live latency. If the stream starts to lag behind more than 0.1 seconds the playback speed will be increased (by a factor of 1.3 by default) to catch up.
Advanced usage¶
This example show how to implement drift correction that adjusts the playback speed only when the drift is smaller than 5 seconds, and seeks to catch up otherwise.
exoPlayerTech.addDriftListener(new IDriftListener() {
private final float speedAdjustment = 1.3f;
@Override
public void onDriftUpdated(ISpeedHandler speedHandler, Duration drift) {
float driftInSeconds = drift.inUnits(Duration.Unit.SECONDS);
if(Math.abs(driftInSeconds) < 5f) {
if(driftInSeconds > 0.1f) {
speedHandler.setPlaybackSpeed(speedAdjustment);
} else if(driftInSeconds < -0.1f) {
speedHandler.setPlaybackSpeed(1f/speedAdjustment);
} else {
speedHandler.setPlaybackSpeed(1f);
}
} else {
ITimelinePosition currentPosition = enigmaPlayer.getTimeline().getCurrentPosition();
if(currentPosition != null) {
enigmaPlayer.getControls().seekTo(currentPosition.add(drift));
}
}
}
});