Date: Tue, 5 May 2020 23:48:08 -0400 (EDT) From: "Sean C. Farley" <scf@FreeBSD.org> To: freebsd-gecko@freebsd.org Subject: Unable to use microphone in Firefox using ALSA backend Message-ID: <alpine.BSF.2.22.395.2005052239330.66167@thor.farley.org>
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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 -- scf@FreeBSD.org
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