Fixes a case where the locale selector don't show up in Chrome when using
'webspeech' provider.
And adds missing fields to the webspeech transcription messages, after the
addition of some new parameters to those messages with the open
transcription server.
This feature was too coupled to the old closed captions' pads.
(e.g. the old closed captions feature should be enabled for this
to work properly)
Some things were hardcoded and others didn't make sense from the
user experience perspective.
Reverts #876d8aa.
Partially reverts #802964f, removes changes to make closed captions'
pads compatible with live-transcription but keeps provider settings.
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.
