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.
Add mod_audio_fork to FreeSWITCH's build alongside libwebsockets
(which mod_audio_fork depends on).
mod_audio_fork is used by the built in transcription feature as
a way to extract L16 streams from FreeSWITCH via WebSockets for further
processing by arbitrary transcription servers.
For full details on mod_audio_fork itself, please check drachtio's
source repo: github.com/drachtio/drachtio-freeswitch-modules.git
A few cautionary tales about this one:
- The new patch (mod_audio_fork_build.patch) guarantees libwebsockets
is properly linked to FreeSWITCH and that mod_audio_fork is built as
well. That's because mod_audio_fork is not an upstream module.
- The patch _may_ introduce conflicts on FreeSWITCH bumps more easily
than the other patches we have. They shouldn't be too hard to adapt,
though.
- There's fine tuning to be done to FreeSWITCH's unit file regarding
mod_audio_fork's capabilities. Again: check drachtio's repo.
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