W3C home > Mailing lists > Public > public-media-capture@w3.org > December 2012

RE: Changing track sources...

From: Travis Leithead <travis.leithead@microsoft.com>
Date: Fri, 7 Dec 2012 18:34:42 +0000
To: Martin Thomson <martin.thomson@gmail.com>
CC: "public-media-capture@w3.org" <public-media-capture@w3.org>
Message-ID: <9768D477C67135458BF978A45BCF9B3853AD1B05@TK5EX14MBXW603.wingroup.windeploy.ntdev.microsoft.com>
> From: Martin Thomson [mailto:martin.thomson@gmail.com]
> On 7 December 2012 09:55, Travis Leithead <travis.leithead@microsoft.com>
> wrote:
> > In the call, it was mentioned that we have a requirement to be able to
> change the source of a track while preserving the identity of the track
> for the purposes of a PeerConnection and possibly other reasons.
> I think that this is solving the wrong problem.  We already have this
> capability for <video> tags.  Set the .src attribute to point to a new
> URL.
> This is only a problem for RTCPeerConnection because it negotiates
> streams based on MediaStream(Track) identifiers.  That's the real
> problem.
> Here's the solution that I propose:
> partial interface RTCPeerConnection {
>     void addStream(MediaStream newStream, optional MediaStream
> streamToReplace);
> };
> This of course has ramifications for how streams are handled.  It's
> still unclear whether a track identifier can change; and whether new
> streams and tracks are created when a stream is added to
> RTCPeerConnection.  c.f. Adam's proposal on Outgoing/Incoming streams.

If this is the case, then I won't try to support changing a track's source as a functionality of the track or constraints.
Received on Friday, 7 December 2012 18:36:29 UTC

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