Date: Mon, 14 Sep 2020 09:41:36 +1000 From: "Tim Preston" <tim@timpreston.net> To: freebsd-questions@freebsd.org Subject: Re: USB sound devices with FreeBSD-CURRENT Message-ID: <ac0c29f6-fa12-4e38-9ffe-03fb2e92865b@www.fastmail.com> In-Reply-To: <mailman.121.1599998402.92352.freebsd-questions@freebsd.org> References: <mailman.121.1599998402.92352.freebsd-questions@freebsd.org>
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Hi Graham, The best article I've found so far is https://wiki.freebsd.org/Sound Hopefully you can find something useful there. I'm not switching any devices on the fly, but I am combining two USB devices (2 channel audio interface for headphones and a webcam with mic) into a single virtual device with virtual_oss, then run sndio over the top for video chat in both Firefox and Chromium (needs to be compiled with sndio support). Regards, Tim > Date: Sun, 13 Sep 2020 10:21:52 +0100 > From: Graham Perrin <grahamperrin@gmail.com> > To: FreeBSD CURRENT <freebsd-current@freebsd.org>, FreeBSD questions > <freebsd-questions@freebsd.org> > Subject: USB sound devices with FreeBSD-CURRENT > Message-ID: <9551111b-5dfb-c42b-6f58-81f6c8b8bbd1@gmail.com> > Content-Type: text/plain; charset=utf-8; format=flowed > > I'm confused about use of USB devices for audio (primarily with Firefox > and Chromium). > > Re: > <https://forums.freebsd.org/threads/switching-dsp-devices-on-the-fly.69773/#post-419100>; > under 'switching dsp-devices on-the-fly' > > > ? hw.snd.default_unit to "0", which will automatically assign > > hw.snd.default_unit to the newly-attached devices. ?" > > ? so in sysctl.conf I experimented with: > > hw.snd.default_unit="0" > > ? and after signing in (to KDE Plasma) I attach first the USB microphone > (Alctron USB700 Alctron USB700) then a USB headset (SteelSeries > SteelSeries Siberia 350). > > virtual_oss and sndiod are enabled. > > With this setup, as far as I can tell: > > 1. Chromium simply does not play AV content e.g. > <https://www.ted.com/talks/james_geary_metaphorically_speaking>; ? after > a click to play, there's a moment of visual motion but no playback > > 2. if Firefox media.cubeb.backend set to oss then behaviour is the same > as Chromium > > 3. if Firefox media.cubeb.backend is not set (audio backend defaults to > pulse-rust) then playback occurs through IDT 92HD81B1X (Analog) ? not USB. > > ---- > > root@momh167-gjp4-8570p:~ # date ; uname -v > Sun Sep 13 08:25:39 BST 2020 > FreeBSD 13.0-CURRENT #64 r365364: Sun Sep? 6 01:38:18 BST 2020 > root@momh167-gjp4-8570p:/usr/obj/usr/src/amd64.amd64/sys/GENERIC-NODEBUG > root@momh167-gjp4-8570p:~ # service virtual_oss start ; service sndiod > start ; service virtual_oss status ; service sndiod status ; cat > /dev/sndstat ; grep " -f /dev/" /usr/local/etc/rc.d/virtual_oss | grep > -v \# ; sysctl hw.snd.default_unit > Starting Virtual OSS config dsp ...hw.snd.basename_clone: 0 -> 0 > ?done > Starting sndiod. > virtual_oss is running as pid 5688. > sndiod is running as pid 5697. > Installed devices: > pcm0: <ATI R6xx (HDMI)> (play) default > pcm1: <IDT 92HD81B1X (Analog 2.0+HP/2.0)> (play/rec) > pcm2: <IDT 92HD81B1X (Analog)> (play/rec) > pcm3: <USB audio> (rec) > pcm4: <USB audio> (play/rec) > Installed devices from userspace: > dsp: <Virtual OSS> (play/rec) > ? -f /dev/dsp0 \ > hw.snd.default_unit: 0 > root@momh167-gjp4-8570p:~ # > > ---- > > In addition, as far as I can tell: > > 4. if I remove then reconnect the two USB devices, the devices are no > longer driven > > * neither device 'lights up' > > * playback in Firefox (with oss) and Chromium is visible, but no longer > audible on any device > > * playback in Firefox (with puse-rust) is visible, but no longer audible > on any device. > > ---- > > root@momh167-gjp4-8570p:~ # grep Alctron /var/log/messages > Sep 13 06:17:08 momh167-gjp4-8570p kernel: ugen0.7: <Alctron USB700 > Alctron USB700> at usbus0 (disconnected) > Sep 13 06:19:07 momh167-gjp4-8570p kernel: ugen0.3: <Alctron USB700 > Alctron USB700> at usbus0 > Sep 13 06:19:07 momh167-gjp4-8570p kernel: uaudio0: <Alctron USB700 > Alctron USB700, class 0/0, rev 1.10/1.00, addr 11> on usbus0 > Sep 13 06:19:07 momh167-gjp4-8570p kernel: uhid1: <Alctron USB700 > Alctron USB700, class 0/0, rev 1.10/1.00, addr 11> on usbus0 > Sep 13 09:13:08 momh167-gjp4-8570p kernel: ugen0.5: <Alctron USB700 > Alctron USB700> at usbus0 > Sep 13 09:13:08 momh167-gjp4-8570p kernel: uaudio1: <Alctron USB700 > Alctron USB700, class 0/0, rev 1.10/1.00, addr 4> on usbus0 > Sep 13 09:13:08 momh167-gjp4-8570p kernel: uhid0: <Alctron USB700 > Alctron USB700, class 0/0, rev 1.10/1.00, addr 4> on usbus0 > Sep 13 09:48:51 momh167-gjp4-8570p kernel: ugen0.5: <Alctron USB700 > Alctron USB700> at usbus0 (disconnected) > root@momh167-gjp4-8570p:~ # grep SteelSeries /var/log/messages > Sep 13 06:17:22 momh167-gjp4-8570p kernel: ugen0.6: <SteelSeries > SteelSeries Siberia 350> at usbus0 (disconnected) > Sep 13 06:17:51 momh167-gjp4-8570p kernel: ugen0.6: <SteelSeries > SteelSeries Siberia 350> at usbus0 > Sep 13 06:17:51 momh167-gjp4-8570p kernel: uaudio0: <SteelSeries > SteelSeries Siberia 350, class 0/0, rev 1.10/2.08, addr 10> on usbus0 > Sep 13 06:19:00 momh167-gjp4-8570p kernel: ugen0.6: <SteelSeries > SteelSeries Siberia 350> at usbus0 (disconnected) > Sep 13 06:19:12 momh167-gjp4-8570p kernel: ugen0.7: <SteelSeries > SteelSeries Siberia 350> at usbus0 > Sep 13 06:19:12 momh167-gjp4-8570p kernel: uaudio1: <SteelSeries > SteelSeries Siberia 350, class 0/0, rev 1.10/2.08, addr 13> on usbus0 > Sep 13 09:13:08 momh167-gjp4-8570p kernel: ugen0.4: <SteelSeries > SteelSeries Siberia 350> at usbus0 > Sep 13 09:13:08 momh167-gjp4-8570p kernel: uaudio0: <SteelSeries > SteelSeries Siberia 350, class 0/0, rev 1.10/2.08, addr 3> on usbus0 > root@momh167-gjp4-8570p:~ # tail /var/log/messages > Sep 13 10:11:39 momh167-gjp4-8570p kernel: pcm4: unregister: mixer busy > Sep 13 10:11:39 momh167-gjp4-8570p kernel: pcm4: Waiting for sound > application to exit! > Sep 13 10:11:39 momh167-gjp4-8570p kernel: pcm4: unregister: mixer busy > Sep 13 10:11:39 momh167-gjp4-8570p kernel: pcm4: Waiting for sound > application to exit! > Sep 13 10:11:39 momh167-gjp4-8570p kernel: pcm4: unregister: mixer busy > Sep 13 10:11:39 momh167-gjp4-8570p kernel: pcm4: Waiting for sound > application to exit! > Sep 13 10:11:39 momh167-gjp4-8570p kernel: pcm4: unregister: mixer busy > Sep 13 10:11:39 momh167-gjp4-8570p kernel: pcm4: Waiting for sound > application to exit! > Sep 13 10:11:39 momh167-gjp4-8570p kernel: pcm4: unregister: mixer busy > Sep 13 10:11:39 momh167-gjp4-8570p kernel: pcm4: Waiting for sound > application to exit! > root@momh167-gjp4-8570p:~ # > > ---- > > Clearly I'm doing something wrong. > > If on-the-fly use of USB audio devices is not possible, then must I keep > the devices connected whilst I'm signed in to the desktop environment? >
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