* Do not send both asb-send-time and twcc.
In single peer connection mode, both extensions are set on the media
engine and both would be negotiated. Unfortunately, pion/webrtc does
not yet support RTPSender.SetParameters() which would allow setting
specific header extensions for the sender. So, check for TWCC enabled
and use it. If not, do abs-send-time if that is enabled.
* check BWE type
* comment
* Better naming/logging for send side bwe
* Check BWE congestion state before doing optimal allocation.
It is possible that BWE declares congestion, but the estimated bandwidth
may still be enough to accommodate all tracks. So, stream allocator
would still not in DEFICIENT state. On a new track allocation, it will
get optimal allocation although BWE is in congested state.
Take BWE congestion state into consideration before doing any track
allocation.
* get congestion state from BWE rather than caching it in stream allocator
* get states from update
* log contributing groups only when they are small in number
* get oldest group always
* notify only when estimate is dropping
* require stronger CTR down trend
* maintain min/max group
* relax thresholds to declare congestion a bit
* Try up-allocation on neutral trend.
Some probes end up with neutral trend due to getting much estimates of
same value. It is okay to try up-allocating in those cases. Otherwise,
the stream allocator some times gets stuck and does not up-allocate at
all as all probes end up neutral.
Changing the name of the signal to `NotCongesting` to signify it is
either neutral or clearing.
* wait 5 RTT for probe to finalize
* trend detector object encoder
Reverting back to pre-refactor behaviour. Was trying to avoid doing
special treatment when in probe, but REMB values are hard to predict
and the NACKs as well.
So, freeze updates when congesting in probe till the probe is done.
Otherwise, further changes while probe is finalising sometimes causes an
invalid signal and tracks are not up allocated.
* Clean up remote BWE a bit.
- Had forgotten to start worker, fix that
- ensure correct type of channel observer (probe OR non-probe) based on
probe state.
- introduce congested hangover state to see better state transitions.
Does not really affect operation, but state transitions are clearer.
* prevent 0 ticker
Raja Subramanian