Fix AddTrack transceiver reuse per W3C specs #1861
Open
+6
−1
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
According to W3C specifications, the transceiver can be reused if "The sender has never been used to send. More precisely, the [[CurrentDirection]] slot of the RTCRtpTransceiver associated with the sender has never had a value of "sendrecv" or "sendonly"".
Current implementation does not have CurrentDirection slot, so the flag usedToSend is set on setDirection change.
This fixes #1843 and maybe other issues (for us it fixes other two issues when reusing transceiver, eg clients going and coming back to a conference).
This has been done on the v2 branch because we currently don't have the resources to switch our software to v3 and test it there. Looking at the source (master) seems this kind of issue is still there.