I am attempting to get the microphone on my webcam to work using ALSA in
Firefox 76. It used to work although I do not know when it stopped. If
I use ALSA with ffmpeg, the microphone does work, so I suspect it should
be something simple that I am missing in Firefox.
My asound.conf makes use of the ASYM PCM plugin to combine the input and
output from different devices.
/usr/local/etc/asound.conf
--------------------------
# Create slave of the sound card/speakers.
pcm_slave.oss4 {
pcm.type oss
pcm.device /dev/dsp4
pcm.hint.description "Open Sound System"
}
# Create slave of the webcam microphone.
pcm_slave.oss7 {
pcm.type oss
pcm.device /dev/dsp7
pcm.hint.description "Open Sound System"
}
# Mix webcam for input and speakers for output.
pcm.!sysdefault {
type asym
capture.pcm {
type plug
slave oss7
}
playback.pcm {
type plug
slave oss4
}
hint {
description "Open Sound System"
}
}
pcm.!default pcm.sysdefault
# There is no asym for ctl. It would be nice to tie the controllers together
# into a single device like pcm asym does.
ctl.oss {
type oss
hint {
description "Open Sound System"
}
}
ctl.!sysdefault ctl.oss
ctl.!default ctl.sysdefault
--------------------------
Notes:
- Running firefox-76.0_2,1 built locally within poudriere.
- Firefox is using ALSA according to about:support.
- Firefox is playing audio just fine.
- Firefox detects both the video (two blank lines) and microphone when a
WebRTC session starts. It calls the microphone "default".
- No other backend other than ALSA is installed on the system nor was
Firefox compiled with one.
- ffmpeg is able to use the microphone with this command:
ffmpeg -f alsa -i default test.wav
- The webcam mixer mic device is at 100.
- Muting the microphone in a WebRTC session in Jitsi Meet
(https://meet.jit.si/) or AppRTC (https://appr.tc/) causes the tab to
crash rather often with a signal 11. Sometimes it freezes for a
moment then crashes but mostly crashes instantly.
- FreeBSD 12.1-STABLE r360638.
Any suggestions? I may have to try sndio or virtual_oss someday, but I
figure this should still work with Firefox.
Sean
--
s...@freebsd.org
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