Oh, one other thing. Using PortAudio will *not* reduce latency. JACK does not add any latency. On Sun, Oct 4, 2015 at 6:46 PM, Paul Davis <paul@xxxxxxxxxxxxxxxxxxxxx> wrote: > This can be hard to do. Why can't you tell software to use hw:1 ? > > Most system BIOS setup utilities can be used to disable onboard sound. > Getting Linux to reorder them is also possible but can be complex > depending on the types of devices (PCI, USB etc) > > On Sun, Oct 4, 2015 at 2:57 PM, ansible <bburdette@xxxxxxxxx> wrote: >> I compiled supercollider to play through portaudio rather than jack, as it >> usually does, in an attempt to reduce latency and hassle. It works for >> audio device hw:0,0, but it doesn't work for hw:1,0. My problem is that on >> my device hw:0,0 has horrible latency - 70ms - while hw:1,0 has 9ms latency, >> much better. >> >> So what I'd like to do is reorder the audio devices, or disable the onboard >> audio, and have my current hw:1,0 be the hw:0,0 device. Hopefully then >> supercollider will work with it and I'll have those coveted low latency >> numbers. This is on arch linux on a bananapi armv7 computer. >> >> So here's the output from aplay -l: >> >> ``` >> [bananapi@lemaker ~]$ aplay -l >> **** List of PLAYBACK Hardware Devices **** >> card 0: sunxicodec [sunxi-CODEC], device 0: M1 PCM [sunxi PCM] >> Subdevices: 1/1 >> Subdevice #0: subdevice #0 >> card 1: Pro [Sound Blaster X-Fi Go! Pro], device 0: USB Audio [USB Audio] >> Subdevices: 1/1 >> Subdevice #0: subdevice #0 >> [bananapi@lemaker ~]$ >> ``` >> >> According to the [alsa wiki][1], I should be able to reorder the devices >> using a .conf file. See 'set the default sound card'. It gives the example >> of this: >> >> ``` >> /etc/modprobe.d/alsa-base.conf >> >> options snd_mia index=0 >> options snd_hda_intel index=1 >> ``` >> >> Ok so I made a file like that, but I only know the name of the usb driver, >> not the onboard sound driver. lsmod reveals the following: >> >> ``` >> [bananapi@lemaker ~]$ lsmod >> Module Size Used by >> snd_usb_audio 96225 0 >> snd_hwdep 5757 1 snd_usb_audio >> snd_usbmidi_lib 18033 1 snd_usb_audio >> cdc_acm 20518 0 >> spidev 6217 0 >> spi_sun7i 17802 0 >> sunxi_cedar_mod 9808 0 >> mali_drm 2608 0 >> drm 209226 1 mali_drm >> mali 111427 0 >> disp_ump 861 0 >> ump 52415 2 mali,disp_ump >> ap6210 584133 0 >> ip_tables 12937 0 >> x_tables 17443 1 ip_tables >> ``` >> >> If I do "modprobe -r snd_usb_audio", then snd_hwdep and snd_usbmidi_lib both >> disappear too, so they are all for the same device I think. That leaves >> nothing for the driver name for the onboard audio. >> >> The alsa wiki says that the driver names should be in "cat >> /proc/asound/modules" but I don't have that directory on my system. >> >> So anyway I made an alsa-base.conf file as directed, which looks like this: >> >> ``` >> [bananapi@lemaker ~]$ cat /etc/modprobe.d/alsa-base.conf >> options snd_usb_audio index=0 >> options sunxicodec index=1 >> [bananapi@lemaker ~]$ >> ``` >> >> After creating that file and rebooting aplay just returns this. >> >> ``` >> [bananapi@lemaker ~]$ aplay -l >> **** List of PLAYBACK Hardware Devices **** >> card 0: sunxicodec [sunxi-CODEC], device 0: M1 PCM [sunxi PCM] >> Subdevices: 1/1 >> Subdevice #0: subdevice #0 >> [bananapi@lemaker ~]$ >> ``` >> >> So this alsa-base.conf has the effect of making only the onboard audio >> available instead of reordering. I most likely have the 'sunxicodec' name >> wrong for the onboard audio, I'm just guessing at that, and have no idea >> what the driver name for that is, if there even is one. I'm kind of >> suspecting the audio device is part of a monolithic driver for the whole >> system-on-chip, is that possible? >> >> [1]: >> https://wiki.archlinux.org/index.php/Advanced_Linux_Sound_Architecture >> >> >> >> -- >> View this message in context: http://linux-audio.4202.n7.nabble.com/make-alsa-device-hw-1-0-be-hw-0-0-somehow-tp97402.html >> Sent from the linux-audio-user mailing list archive at Nabble.com. >> _______________________________________________ >> Linux-audio-user mailing list >> Linux-audio-user@xxxxxxxxxxxxxxxxxxxx >> http://lists.linuxaudio.org/listinfo/linux-audio-user _______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx http://lists.linuxaudio.org/listinfo/linux-audio-user
