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bridge_softmix: Reduce topology cloning and improve renegotiation.

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As channels join and leave an SFU the bridge_softmix module
needs to renegotiate to add and remove their streams from
the other participants. Previously this was done by constructing
the ideal stream topology every time but in the case of leave
this was incomplete.

This change makes it so bridge_softmix keeps an ideal stream
topology for each channel and uses it when making changes. This
ensures that when we request a renegotiation we are always
certain that we are aiming for the best stream topology
possible. In the case of a channel leaving this ensures that
we try to have an existing participant fill their place if
a participant has a fixed limit on the maximum number of video
streams they allow.

ASTERISK-27354

Change-Id: I58070f421ddeadd2844a33b869b052630cf2e514
This commit is contained in:
Joshua Colp
2017-10-14 19:41:37 +00:00
parent 3a2b132411
commit 5d8c517960
2 changed files with 38 additions and 105 deletions
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2
bridges/bridge_softmix/include/bridge_softmix_internal.h
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@@ -167,6 +167,8 @@ struct softmix_channel {
short our_buf[MAX_DATALEN];
/*! Data pertaining to talker mode for video conferencing */
struct video_follow_talker_data video_talker;
/*! The ideal stream topology for the channel */
struct ast_stream_topology *topology;
};
struct softmix_bridge_data {