)">BaseMediaSource</a></code></span></div>
<div class="block">Starts source preparation and enables the source, see <a href="../../source/BaseMediaSource.html#prepareSource(com.google.android.exoplayer2.source.MediaSource.MediaSourceCaller,com.google.android.exoplayer2.upstream.TransferListener,com.google.android.exoplayer2.analytics.PlayerId)"><code>BaseMediaSource.prepareSource(MediaSourceCaller,
 TransferListener, PlayerId)</code></a>. This method is called at most once until the next call to <a href="..