ionUs,
                                    float&nbsp;playbackSpeed,
                                    boolean&nbsp;rebuffering,
                                    long&nbsp;targetLiveOffsetUs)</pre>
<div class="deprecationBlock"><span class="deprecatedLabel">Deprecated.</span></div>
<div class="block">Called repeatedly by the player when it's loading the source, has yet to start playback, and
 has the minimum amount of data necessary for playback to be started. The value returned
 determines whether pla