p>Moreover, two additional virtual functions can be overridden as well if necessary: </p><ul>
<li><code>onStart</code> is called before the capture happens, to perform custom initializations </li>
<li><code>onStop</code> is called after the capture ends, to perform custom cleanup</li>
</ul>
<p>The audio capture feature may not be supported or activated on every platform, thus it is recommended to check its availability with the <a class="el" href="#aab2bd0fee9e48d6cfd449b1cb078ce5a" title="Check if the syst