Henrik Boström 4df20baff1 Implement GetParameters/GetSources support for unsignaled SSRCs.
Unsignaled SSRCs are only applicable for the receiver case (not sender).
This CL updates the receievr's GetParameters() and GetSources() methods
to lookup parameters/sources by the current SSRC (whether or not it was
signaled) instead of only looking at the signaled SSRC.

To clarify that the `ssrc_` variable inside the [Audio/Video]RtpReceiver
is the signaled ssrc (and not set if the current ssrc is unsignaled),
we rename this variable to `signaled_ssrc_`.

By the looks of it, other APIs like setting volume or packetizers also
have a dependency on the assumptions that the SSRC is signaled. We will
not address that in this CL, but this CL makes that more clear.

Bug: webrtc:14811
Change-Id: I32c93d264ab441ade23a4078639744d25b791742
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/290573
Reviewed-by: Per Kjellander <perkj@webrtc.org>
Commit-Queue: Henrik Boström <hbos@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#39051}
2023-01-10 06:44:27 +00:00
..
2023-01-09 12:21:25 +00:00
2019-01-28 11:17:00 +00:00
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