roid.exoplayer2.source">MediaPeriod</a></code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>callback</code> - Callback to receive updates from this period, including being notified when
     preparation completes.</dd>
<dd><code>positionUs</code> - The expected starting position, in microseconds.</dd>
</dl>
</li>
</ul>
<a id="maybeThrowPrepareError()">
<!--   -->
</a>
<ul class="blockList">
<li class="blockList">
<h4>maybeThrowPrepareError</h4>
<pre class="methodSignature">public&nbsp