- From: David Dorwin <ddorwin@google.com>
- Date: Mon, 3 Mar 2014 15:48:20 -0800
- To: Mark Watson <watsonm@netflix.com>
- Cc: Silvia Pfeiffer <silviapfeiffer1@gmail.com>, Henri Sivonen <hsivonen@hsivonen.fi>, "public-html-media@w3.org" <public-html-media@w3.org>, "Robert O'Callahan" <robert@ocallahan.org>, Aaron Colwell <acolwell@google.com>
- Message-ID: <CAHD2rsjiqn_2oDTQ--9GijOXQfNDr5z_SjAqa0j=BUUE0K6VWg@mail.gmail.com>
Thanks for the feedback. I filed https://www.w3.org/Bugs/Public/show_bug.cgi?id=24904. Feel free to continue discussion of the EME instances in that bug. (MSE probably needs a bug as well.) As for a consistent approach across specs, is this something the TAG should address? Should we file a more general bug somewhere? On Mon, Mar 3, 2014 at 2:40 PM, Mark Watson <watsonm@netflix.com> wrote: > It would seem to me that the only consistent approach that is guaranteed > to be suitable for the wide variety of places this problem occurs is to > require the data to be copied in the synchronous part of the function call. > Implementations can do copy-on-write optimizations if they choose. > > The alternative is to say that for *all* applications it *always* makes > sense for the ArrayBuffer to remain unmodified until the asynchronous part > of the operation completes. Seems hard to make such a broad statement / > prediction. > > ...Mark > > > On Mon, Mar 3, 2014 at 2:35 PM, Silvia Pfeiffer <silviapfeiffer1@gmail.com > > wrote: > >> We also have this issue for DataCue in the HTML spec [1] with >> ArrayBuffer, see https://www.w3.org/Bugs/Public/show_bug.cgi?id=24687 >> . >> I agree we should have a consistent approach. >> Would it make sense to require cloning on assignment in the IDL spec? >> >> Silvia. >> >> [1] http://www.w3.org/TR/html5/embedded-content-0.html#datacue >> >> On Tue, Mar 4, 2014 at 2:39 AM, Mark Watson <watsonm@netflix.com> wrote: >> > The same issue exists in WebCrypto. It would be nice to have a >> > consistent approach across specifications. >> > >> > ...Mark >> > >> > Sent from my iPhone >> > >> >> On Mar 3, 2014, at 3:36 AM, Henri Sivonen <hsivonen@hsivonen.fi> >> wrote: >> >> >> >>> On Sat, Feb 22, 2014 at 12:16 AM, David Dorwin <ddorwin@google.com> >> wrote: >> >>> I believe there is a similar issue with MSE, and it was decided that >> such >> >>> behavior is undefined. >> >> >> >> Seems like a bad way to deal with this. >> >> >> >>> Does anyone object to the behavior also being >> >>> undefined for EME? >> >> >> >> I object to both MSE and EME introducing a race condition like that. >> >> IIRC, this issue already came up with Web Audio. CCing roc for the >> >> details. >> >> >> >> I think the method should act as if it made a copy of the data before >> >> returning. In practice, it probably makes sense to have some sort of >> >> copy-on-write mechanism behind the scenes to avoid copying when no one >> >> is actually writing to the original buffer. >> >> >> >>> Do we need to explicitly document this anywhere? >> >> >> >> Yes! >> >> >> >> -- >> >> Henri Sivonen >> >> hsivonen@hsivonen.fi >> >> https://hsivonen.fi/ >> >> >> > >> > >
Received on Monday, 3 March 2014 23:49:07 UTC