[whatwg] Stream API Feedback
Philip Jägenstedt
philipj at opera.com
Thu Mar 17 09:31:13 PDT 2011
On Thu, 17 Mar 2011 16:48:40 +0100, Olli Pettay <Olli.Pettay at helsinki.fi>
wrote:
> On 03/17/2011 03:11 PM, Lachlan Hunt wrote:
>> On 2011-03-16 19:29, Olli Pettay wrote:
>>> Perhaps navigator.getUserMedia("audio,video", success, error);
>>> could return an url to the device in the success callback, and that url
>>> could be then set to video.src.
>>
>> The creation of a URL is unnecessary indirection. It's easier to avoid
>> creating special URLs entirely, and instead assign the the Stream object
>> directly to video.src.
>
>
> The type of .src is string.
> Assigning a different type of object to it
> is quite strange.
>
> Also, if getUserMedia would return just an URL, browser wouldn't need
> to create any stream object (unless someone then want to stream
> from <video> to PeerConnection).
Sure, but instead one would have to mint URLs and keep a mapping between
those URLs and the streams that they actually represent. If people copy
those URLs around, how long are they supposed to work for? Consider this
scenario:
function getStreamURL() {
var s;
// code that sets s to a new Stream object for the default camera or
something
return s.url;
}
var url = getStreamURL();
/* garbage collector? */
document.querySelector('video').src = url;
Does this break randomly depending on when the garbage collector runs, or
is the returned string somehow magical so that it actually keeps the
stream alive?
>> ... src property definition needs to be changed
>> from DOMString to any.
>
> That would be strange and make API inconsistent with <img> and <iframe>
> for example.
<video> is already very different to <img> and <iframe> in that it also
has child <source> elements and a currentSrc attribute. What's the
practical harm in allowing video.src setter take an object?
--
Philip Jägenstedt
Core Developer
Opera Software
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