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Re: Sort out active state spec inconsistencies

From: Adam Bergkvist <adam.bergkvist@ericsson.com>
Date: Tue, 1 Dec 2015 10:03:25 +0000
To: Peter Thatcher <pthatcher@google.com>
CC: "public-media-capture@w3.org" <public-media-capture@w3.org>
Message-ID: <A222C88B6882744D8D4B9681B315889025DE2C54@ESESSMB307.ericsson.se>
Anyone else that has input on this matter?

Otherwise, I'll go ahead and create an github issue.


On 2015-11-24 09:34, Adam Bergkvist wrote:
> I wouldn't mind going down the path of #3 since it would indeed simplify
> things to get rid of the double events. I wonder how much code we would
> break (besides browser layout tests).
> /Adam
> On 2015-11-23 23:18, Peter Thatcher wrote:
>> I like #3.  It simplifies.  The JS can get to the information it needs
>> and doesn't need it to be duplicated in a complex way.
>> On Tue, Nov 17, 2015 at 2:18 AM, Adam Bergkvist
>> <adam.bergkvist@ericsson.com <mailto:adam.bergkvist@ericsson.com>> wrote:
>>      Hi
>>      We have some inconsistencies in the spec regarding the active state.
>>      We define active in terms of the stream's track set. In short, if a
>>      non-ended track exists, the stream is active, otherwise inactive.
>>      The active attribute is specified to return true if the stream is active
>>      and false otherwise.
>>      We also specify that when a stream goes from active, to inactive, the
>>      active attribute should be updated to true and the event fired. This
>>      contradicts the other text that defines the attribute in terms of the
>>      stream's track set.
>>      Possible solutions:
>>      1. Just remove the attribute updating part of the event dispatching
>>      steps.
>>      Since the events are scheduled and fired as a result of sync API calls,
>>      we might en up in a situation that an "active" event is fired, but
>>      that's not true (anymore).
>>      2. Remove the attribute updating part of the event dispatching and use a
>>      activitychanged event instead of specific active/inactive events.
>>      This way when a scheduled event fires, the script needs to check the
>>      attribute manually and react. We never get the "event type" - "attribute
>>      value" mismatch.
>>      3. Remove the active/inactive events all together.
>>      These events are rather unnecessary. They either follow direct
>>      manipulation from the script or some other event when the UA has
>>      initiated a the result of a change to a stream's track set. For example
>>      the add/removetrack events or MediaStreamTrack ended.
>>      /Adam
Received on Tuesday, 1 December 2015 10:03:59 UTC

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