version from a PSSH atom. Version 0 and 1 PSSH atoms are supported.

 <p>The version is only parsed if the data is a valid PSSH atom.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>atom</code> - The atom to parse.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>The parsed version. -1 if the input is not a valid PSSH atom, or if the PSSH atom has
     an unsupported version.</dd>
</dl>
</li>
</ul>
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</a>
<