Audio hw profiling supports USB cards

I posted about audio hardware-profiling:

https://bkhome.org/news/202001/improved-hardware-profiling-for-audio.html

Today one of the USB audio "cards" arrived, purchased from eBay. It works great, and hardware-profiling has been extended to include USB devices. Here is how the hardware-profile is computed in /usr/sbin/mscw:

 #200113 hardware-profile... 200115 improve...
 SND_HW_PROFILE="${card}+"
 AUDIO_IDS="$(lspci -d ::0403 -n | cut -f 1,3 -d ' ' | tr ' ' '|')" #ex: 00:1b.0|8086:1c20
 CARD_PATH="$(readlink /sys/class/sound/card${card})"
 #...ex: ../../devices/pci0000:00/0000:00:1b.0/sound/card0
 echo "$CARD_PATH" > /tmp/10alsa-CARD_PATH
 #200121 detect usb audio device...
 USB_SUBPATH="$(grep -o '/usb[0-9]/[0-9.:-]*/[0-9.:-]*/' /tmp/10alsa-CARD_PATH)" #ex: /usb3/3-2/3-2:1.0/
 #...ex: ../../devices/pci0000:00/0000:00:1c.1/0000:03:00.0/usb3/3-2/3-2:1.0/sound/card1
 if [ -e /sys/bus/usb/devices${USB_SUBPATH}modalias ];then
  aID="$(cut -c 6-14 /sys/bus/usb/devices${USB_SUBPATH}modalias)" #ex: 8086p0808
  aID="${aID/p/:}"
  SND_HW_PROFILE="${card}+usb+${aID}"
 else
  for aAID in $AUDIO_IDS
  do
   aPTH=":${aAID/|*/}/sound" #ex: :00:1b.0/sound
   aID="${aAID/*|/}"         #ex: 8086:1c20
   if grep -q "${aPTH}" /tmp/10alsa-CARD_PATH;then
    SND_HW_PROFILE="${card}+pci+${aID}"
    break
   fi
  done
 fi
 echo "#SND_HW_PROFILE='${SND_HW_PROFILE}'" >> /etc/asound.conf
 cp -a -f /etc/asound.conf /etc/asound.conf.${SND_HW_PROFILE}

An example profile for a USB card is "1+usb+8086:0808".  Also, /etc/init.d/10alsa has been edited. 

Tags: easy