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<dd><code>source</code> - The <a href="../DataSource.html" title="interface in com.google.android.exoplayer2.upstream"><code>DataSource</code></a> performing the transfer.</dd>
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<h4>onTransferStart</h4>
<pre class="methodSignature">public&nbsp;void&nbsp;onTransferStart&#8203;(<a href="../DataSource.html" title="interface in