turn on recording during call

[juha-h]

Is it so that it is not possible to turn recording on/off during call using sndfile module?

I tried to load it when call was active and got to console:

/insmod sndfile=0/0 video=0/0 (bit/s) efps=0.0/0.0    
aufilt: sndfile
sndfile: saving files in /tmp
loaded module sndfile

but there was no sndfile: dumping ... messages and nothing came to /tmp.

[juha-h]

Didn't get any comments (which is unfortunately very common on this page), but I did an experiment.

While in call, I put the call on hold. Then I load sndfile module and resume the call. After resume, I see sndfile: dumping ...messages, which was very encouraging. Finally, I put the call on hold again and remove sndfile module and expect recording to stop, but I get crash:

test@test.tutpro.com: Call established: sip:foo@test.tutpro.com
call: hold sip:foo@test.tutpro.com/0 (bit/s) efps=0.0/0.0    
stream: update 'audio'
stream: update 'video'
stream: update 'audio'3198 video=0/0 (bit/s) efps=0.0/0.0    
stream: update 'video'
/insmod sndfile=25916/3198 video=0/0 (bit/s) efps=0.0/0.0    
aufilt: sndfile
sndfile: saving files in /tmp
loaded module sndfile
call: resume sip:foo@test.tutpro.com) efps=0.0/0.0    
stream: update 'audio'
stream: update 'video'
stream: update 'audio'deo=0/0 (bit/s) efps=0.0/0.0    
stream: update 'video'
audio_recv: Set audio decoder: opus 16000Hz 1ch
webrtc_aec: creating shared state: [16000 Hz, 1 channels, blocksize 160 samples]
sndfile: dumping encode audio to /tmp/dump-sip:test@test.tutpro.com=>sip:foo@test.tutpro.com-2026-05-23-21-20-42-enc.wav
sndfile: dumping decode audio to /tmp/dump-sip:test@test.tutpro.com=>sip:foo@test.tutpro.com-2026-05-23-21-20-42-dec.wav
sndfile: dumping encode audio to /tmp/dump-sip:test@test.tutpro.com=>sip:foo@test.tutpro.com-2026-05-23-21-20-42-enc.wav
audio_recv: player started with sample format S16LE
sndfile: dumping decode audio to /tmp/dump-sip:test@test.tutpro.com=>sip:foo@test.tutpro.com-2026-05-23-21-20-42-dec.wav
00:32] audio=27357/11853 video=0/0 (bit/s) efps=0.0/0.0    
rtprecv: audio: dropping 20 bytes from 10.75.161.36:5406 [seq=16781, ts=995989] (Timer expired [62])
call: hold sip:foo@test.tutpro.com/0 (bit/s) efps=0.0/0.0    
stream: update 'audio'
stream: update 'video'
stream: update 'audio'3200 video=0/0 (bit/s) efps=0.0/0.0    
stream: update 'video'
/rmmod sndfileo=17984/2282 video=0/0 (bit/s) efps=0.0/0.0    
unloading module: sndfile.so
Segmentation fault

Should I now create an issue or what?

[sreimers]

The module has to be loaded always if you want to use it, you can enable/disable filters at runtime with:

aufilt_enable(baresip_aufiltl(), "sndfile", false); // disabled
aufilt_enable(baresip_aufiltl(), "sndfile", true); // enabled

But as you already discovered, only on call changes/start filters are applied.

[juha-h]

Thank you very much. I tested by adding module sndfile.so to config, made a call, then put the call on hold, called aufilt_enable(baresip_aufiltl(), "sndfile", true); and un-hold the call and recording started. Then I put the call the call on hold again, called aufilt_enable(baresip_aufiltl(), "sndfile", false); and un-holded the call. Then after the call was done, I check the recording and it had stopped at aufilt_enable(baresip_aufiltl(), "sndfile", false);.

Since it was quite a job, it would be nice to have /recon and /recoff menu commands that do the necessary steps automatically.