yword">open </span><span class="token keyword">override </span><span class="token keyword">fun </span><a href="add-audio-video-observer.html"><span class="token function">addAudioVideoObserver</span></a><span class="token punctuation">(</span><span class="parameters "><span class="parameter ">observer<span class="token operator">: </span><a href="../-audio-video-observer/index.html">AudioVideoObserver</a></span></span><span class="token punctuation">)</span></div><div class="brief "><p class="paragraph">Sub