[Asterisk-code-review] res pjsip/rtp: No joint capabilities between streams. (asterisk[16])

[Benjamin Keith Ford]

Hello Jenkins2, Joshua Colp, 

I'd like you to reexamine a change. Please visit

    https://gerrit.asterisk.org/9832

to look at the new patch set (#2).

Change subject: res_pjsip/rtp: No joint capabilities between streams.
......................................................................

res_pjsip/rtp: No joint capabilities between streams.

When a conference contained a mixture of audio/video and audio-only
users, a NOTICE message would pop up stating there are no joint
capabilities between streams. This happens because streams can never be
removed, but they can be in a REMOVED state. If we have the scenario
where user A joins with audio/video, user B joins with audio-only, and
user C joins with audio/video, then user A leaves, the message would
be triggered. That removed stream is still in the SDP, but Asterisk
would pass it through, causing it to be seen as a ulaw stream. A check
has been added for removed streams, setting their status to REMOVED when
handling negotiated SDPs.

Also addressed an issue where user A joins, then user B joins but does
not receive video until much later. Full frames were not being sent,
causing some PLI from the browser. Because the video was flowing in one
direction, the browser sets the SSRC to 1, but Asterisk was dropping the
PLI because of that. Added a check to see if the SSRC is 1 or not, which
sends full frames and allows video to flow between user A and user B.
This should only happen when dealing with PSFB or FUR, and in the case
of PSFB, only for PLI.

ASTERISK-27398

Change-Id: I26e7c6f101bc119549eeca406b5bcd25ad8ebc5e
---
M res/res_pjsip_session.c
M res/res_rtp_asterisk.c
2 files changed, 23 insertions(+), 5 deletions(-)


  git pull ssh://gerrit.asterisk.org:29418/asterisk refs/changes/32/9832/2
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Gerrit-Project: asterisk
Gerrit-Branch: 16
Gerrit-MessageType: newpatchset
Gerrit-Change-Id: I26e7c6f101bc119549eeca406b5bcd25ad8ebc5e
Gerrit-Change-Number: 9832
Gerrit-PatchSet: 2
Gerrit-Owner: Benjamin Keith Ford <bford at digium.com>
Gerrit-Reviewer: Jenkins2
Gerrit-Reviewer: Joshua Colp <jcolp at digium.com>
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