The current Vosk CC provider does not support stereo mic streams
(pending investigation as to why).
This commits makes sure stereo is forcefully disabled via SDP munging
only when transcription is active and using Vosk. Having it disabled
in the server side (FreeSWITCH) is not enough because the stereo parameter
is client mandated and replicated by FS on its answer. So we need to
make sure it's always disabled for the time being.
SFU audio does munging server side (and stereo is always off), so no changes
needed there.
The rest of the providers (except WebSpeech) need to be validated against
stereo audio as well.
This is also intended to be temporary - ideally this needs to be fixed in
mod_audio_fork/Vosk/wherever this is breaking.
Firefox does not support selecting an audio output device in its default
configuration. This works around this flaw by just displaying default
output instead of no device found.
Fixes#16057
Output device changes aren't working in 2.6's echo test when artifical delay
is on due to the fact that the feedback audio is being played via the WebAudio
context rather the the HTMLMediaElement. Since output device change works
via HTMLMediaElement's setSinkId, it's basically a no-op.
This commit fixes the issue by piping the AudioContext destination
through the main audio element rather than using WebAudio directly for
playback. An additional stub media element (muted) is added to circumvent one
of Chrome's WebAudio issue.
The alternative would be to use AudioContext's setSinkId, but it isn't
supported by Firefox (setSinkId enabled) and Chrome < 110.
This should work with FF (setSinkId enabled) and a wide array of Chromium
versions.
There was an observer being linked to all breakout rooms that the user has
access to. This logic works for attendees, but not for moderators.
Moderators have access to the list of all breakout rooms, so they were set
with an observer to breakout rooms that they didn't participate, which caused
the audio and video modals to appear everytime the breakout rooms were closed.
So, this commit:
- hangs an breakout rooms' observer only on those mods that have joined any
breakout room. This way, mods that didn't participate in any breakout
room won't be disturbed by the audio and video modal.
- adds an extra check to ensure that the observer will only be run in
non-breakout meetings.
If BBB 2.6 is used without headphones, the audio test works differently
than in 2.5. In 2.5 audio traffic is routed to freeswitch and then
returned to the browser. This adds usually some latency which makes it
easy to hear you audio quality. In 2.6 there is a local loopback. As
there is almost no latency, it is either difficult or even impossible to
check your own audio quality as echo cancellation of the browser will
filter out your own signal.
This patch adds a delay node to the audio loopback test, which makes is
easier to check your quality.
