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Re: "onaddstream" and beyond

From: Aleksandr Avseyev <alexn74@gmail.com>
Date: Tue, 29 Nov 2011 13:43:27 -0800
Message-ID: <CALBppDjCZZAKDTushSpGQ2aLw+5+ikH4+kptBP1VOjjsO2mqfQ@mail.gmail.com>
To: Harald Alvestrand <harald@alvestrand.no>
Cc: public-webrtc@w3.org
Oops. Sorry, meant option #2 and 2 events.

On Mon, Nov 28, 2011 at 9:04 PM, Harald Alvestrand <harald@alvestrand.no>wrote:

> **
> On 11/28/2011 07:30 PM, Aleksandr Avseyev wrote:
>
> Just a thought. Why we can't stay with #1 option but also add an extra
> event OnDataReceived() as well? As some people in the original discussion
> thread, I see use cases where it may be useful.
>
>
> I'm not sure I count the options the way you do.... #1 option is to only
> signal addstream() when the data arrives, which would be the same time as a
> new ondatareceived() event.
>
> I agree that ondatareceived() (probably a track-level, not stream-level
> event) would be a nice complement in the #2 case (where we signal
> addstream() when the stream's negotiated).
>
>
>  On Fri, Nov 18, 2011 at 1:40 AM, Stefan Håkansson LK <
> stefan.lk.hakansson@ericsson.com> wrote:
>
>> Group,
>>
>> recently there has been some discussion (the starting point was <
>> http://lists.w3.org/Archives/Public/public-webrtc/2011Nov/0015.html>) on
>> when the "addstream" event should fire (and a MediaStream object should be
>> handed over to the application):
>>
>> a) Should it be when the signaling setting up the associated RTP-streams
>> over the PeerConnection happens?
>>
>> or
>>
>> b) Should it be when there is some data arriving (in at least one track)
>> for the MediaStream?
>>
>> I think we've have concluded that there is a need for the application to
>> know when an incoming MediaStream has any activity in it. This is automatic
>> in the b) solution as the MediaStream object will not be available before
>> there is any content. But with the a) model, there could be an attribute,
>> or event fired (possibly on the track level), in the MediaStream object
>> that informs the application on when there is any media actually streaming.
>>
>> So basically there are two options:
>>
>> 1) Only create MediaStream objects when there is any media streaming
>>
>> 2) Create MediaStream objects immediately, and have properties of the
>> MediaStream tell the application whether or not any media is streaming
>>
>> Currently in the spec, model 1) is used. This is valid both for
>> getUserMedia (which operates asynchronously) and when an incoming stream is
>> being set up in the PeerConnection.
>>
>> The question to this group is: should we stay with this model, or should
>> we move to model 2)? I think regardless of model selected, it should be
>> applied to both getUserMedia (i.e., if model 2 is selected, a MediaStream
>> object is delivered immediately, and the application can detect when there
>> is any media streaming in it) and PeerConnection creating MediaStreams.
>>
>> I think we need to select one model! What are your preferences?
>> (Personally my preference would be to stay with 1) as it is to me
>> conceptually simpler and that there are fewer things to add/change in the
>> spec -  I worry about our schedule :-) ).
>>
>> Stefan
>>
>>
>
>
>  --
>
>  ------------------------------
> Regards, Aleksandr Avseyev (Futurewei Research Lab)
> www.pictures2.com
>
>
>


-- 

------------------------------
Regards, Aleksandr Avseyev (Futurewei Research Lab)
www.pictures2.com
Received on Tuesday, 29 November 2011 21:43:58 UTC

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