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Re: [rtcweb] Stream control: [MMUSIC] msid-04 submitted

Christer Holmberg <christer.holmberg@ericsson.com> Fri, 14 February 2014 18:42 UTC

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From: Christer Holmberg <christer.holmberg@ericsson.com>
To: Harald Alvestrand <harald@alvestrand.no>, "rtcweb@ietf.org" <rtcweb@ietf.org>
Thread-Topic: [rtcweb] Stream control: [MMUSIC] msid-04 submitted
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Date: Fri, 14 Feb 2014 18:41:55 +0000
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Subject: Re: [rtcweb] Stream control: [MMUSIC] msid-04 submitted
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Hi Harald,

When reading the text, my take is that this is more than controlling a MS and MST.

You are actaually OVERRIDING the rules for sending RTCP. The rules say that RTCP is always sent, as long as the m- line is enabled (non-zero port value).

Regarding "msid-control: enable", I don't think this is needed at all. The DEFAULT is whatever is the value of the existing direction attributes.

Regarding "msid-control: disable", what is the difference compared to using "sendonly"?

Regarding "msid-control: reject", what couldn't you use "msid-control: stop" instead? If the stream has never been enabled, doesn't stop and reject mean the same thing?

Regarding "msid-control: stop", the text says that one guarantees that the track will not be used again. But, I assume the m- line could still be used for sending media, for another track (assuming we allow associating an m- line with another track, that is)?

Regards,

Christer
________________________________________
From: rtcweb [rtcweb-bounces@ietf.org] on behalf of Harald Alvestrand [harald@alvestrand.no]
Sent: Friday, 14 February 2014 8:06 PM
To: rtcweb@ietf.org
Subject: [rtcweb] Stream control: [MMUSIC] msid-04 submitted

I created a proposal for how one could signal the receiver's desires for handling of a MediaStream as an extension to the MSID proposal.

The result is in draft-ietf-mmusic-msid-04 section 5.

There will be discussion in MMUSIC; comments on whether the mechanism fits the RTCWEB need may be appropriate here.

         Harald

-------- Original Message --------
Subject:        [MMUSIC] msid-04 submitted
Date:   Fri, 14 Feb 2014 08:10:54 +0100
From:   Harald Alvestrand <harald@alvestrand.no><mailto:harald@alvestrand.no>
To:     mmusic <mmusic@ietf.org><mailto:mmusic@ietf.org>



I have submitted a new version of the MSID draft, -04.

It tries to make it crystal clear that the msid-semantic:wms is only
intended for signalling MediaStreamTracks and MediaStreams.

It also adds a new functionality: msid-control, which can be used by a
receiver of MediaStreamTracks to signal the sender of a MediaStreamTrack
what the receiver wishes with regard to that MediaStreamTrack; this need
has been identified within the WebRTC and RTCWEB WGs.

It seemed logical to extend this draft with that functionality, since it
is closely allied functionality.

Comments are welcome.

          Harald

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