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<p class="MsoNormal"><span style="font-family:"Calibri","sans-serif"">Hi all,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Calibri","sans-serif""><o:p> </o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US" style="font-family:"Calibri","sans-serif"">I am currently working on the InbandTextTracks in webkit and I am trying to understand how the memory is released.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US" style="font-family:"Calibri","sans-serif"">When we launch the track-in-band.html layout test, two in-band text tracks have been created and added, the corresponding RefPtr has a refCount equals to three.<o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US" style="font-family:"Calibri","sans-serif"">1. Why are there 3 owners for each in-band text track? Is there an hidden cache mechanism?<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:"Calibri","sans-serif""> <o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:"Calibri","sans-serif"">After this test, if we load another page, the player is destroyed and the clearTextTracks method is called.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:"Calibri","sans-serif"">In my understanding, the player should be the only owner of in-band text tracks and thus after the clearTextTracks method is called, the ref count should be decreased to 0 and
the in-band text track object should be deleted.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:"Calibri","sans-serif"">In fact, after the clearTextTracks method the ref count isn’t equals to 0 thus the in-band text track object isn’t deleted.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:"Calibri","sans-serif"">This text track object is deleted when the clear memory cache is called.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:"Calibri","sans-serif""><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:"Calibri","sans-serif"">2<span style="color:#1F497D">.</span> Is it a normal behavior? If yes, what is the interest to use smart pointer?<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:"Calibri","sans-serif""><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:"Calibri","sans-serif"">3<span style="color:#1F497D">.</span> How does the clear memory cache know that this ref pointer (with a ref count != 0) can be released?<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:"Calibri","sans-serif""><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:"Calibri","sans-serif"">Thanks in advance for your explanations, <o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:"Calibri","sans-serif""><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:"Calibri","sans-serif"">Regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:"Calibri","sans-serif""> Benjamin Dupont.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Calibri","sans-serif""><o:p> </o:p></span></p>
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