     ExoTrackSelection[])</code></a> was called.</dd>
<dd><code>mediaPeriodId</code> - Identifies (in the current timeline) the <a href="source/MediaPeriod.html" title="interface in com.google.android.exoplayer2.source"><code>MediaPeriod</code></a> for which the
     selection was made. Will be <a href="#EMPTY_MEDIA_PERIOD_ID"><code>EMPTY_MEDIA_PERIOD_ID</code></a> when <code>timeline</code> is empty.</dd>
<dd><code>renderers</code> - The renderers.</dd>
<dd><code>trackGroups</code> - The <a href="source/Tr