Installation d'un adaptateur audio USB.

* Matériel : Adaptateur audio USB De Gotronic : https://www.gotronic.fr/art-adaptateur-audio-usb-21834.htm

idVendor=1b3f
idProduct=2008

* Distribution : Raspbian Jessie

1/ Brancher la clé USB.

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2/ Vérification.

➜  ~ dmesg
...
[  375.088867] usb 1-1.2: new full-speed USB device number 6 using dwc_otg
[  375.226257] usb 1-1.2: New USB device found, idVendor=1b3f, idProduct=2008
[  375.226271] usb 1-1.2: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[  375.226279] usb 1-1.2: Product: USB Audio Device
[  375.226287] usb 1-1.2: Manufacturer: GeneralPlus
[  375.235604] input: GeneralPlus USB Audio Device as /devices/platform/soc/3f980000.usb/usb1/1-1/1-1.2/1-1.2:1.3/0003:1B3F:2008.0004/input/input3
[  375.299400] hid-generic 0003:1B3F:2008.0004: input,hidraw3: USB HID v2.01 Device [GeneralPlus USB Audio Device] on usb-3f980000.usb-1.2/input3
[  375.384308] usbcore: registered new interface driver snd-usb-audio
➜  ~

➜  ~ lsusb
...
Bus 001 Device 006: ID 1b3f:2008 Generalplus Technology Inc.
...
➜  ~

➜  ~ aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: ALSA [bcm2835 ALSA], device 0: bcm2835 ALSA [bcm2835 ALSA]
  Subdevices: 8/8
  Subdevice #0: subdevice #0
  Subdevice #1: subdevice #1
  Subdevice #2: subdevice #2
  Subdevice #3: subdevice #3
  Subdevice #4: subdevice #4
  Subdevice #5: subdevice #5
  Subdevice #6: subdevice #6
  Subdevice #7: subdevice #7
card 0: ALSA [bcm2835 ALSA], device 1: bcm2835 ALSA [bcm2835 IEC958/HDMI]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 1: Device [USB Audio Device], device 0: USB Audio [USB Audio]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
➜  ~

3/ Configuration.

Ouvrir :

/etc/asound.conf

Ajouter :

pcm.!default  {
   type hw card 1
}
ctl.!default {
   type hw card 1
}

Ouvrir :

/etc/modprobe.d/raspi-blacklist.conf

Ajouter :

blacklist snd_bcm2835

Ouvrir :

/usr/share/alsa/alsa.conf

Chercher :

defaults.ctl.card 0
defaults.pcm.card 0

Remplacer par :

defaults.ctl.card 1
defaults.pcm.card 1

5/ Redémarrer le Raspberry Pi.

6/ Test audio.

➜  ~ speaker-test -c2 -twav
speaker-test 1.0.28
Playback device is default
Stream parameters are 48000Hz, S16_LE, 2 channels
WAV file(s)
Rate set to 48000Hz (requested 48000Hz)
Buffer size range from 96 to 262144
Period size range from 48 to 131072
Using max buffer size 262144
Periods = 4
was set period_size = 65536
was set buffer_size = 262144
 0 - Front Left
 1 - Front Right
Time per period = 5.544785
 0 - Front Left
 1 - Front Right

7/ Liens.

https://superuser.com/questions/989385/how-to-make-raspberry-pi-use-an-external-usb-sound-card-as-a-default http://www.knight-of-pi.org/raspberry-pi-enable-an-usb-sound-card-for-raspbian-jessie/ https://raspberrypi.stackexchange.com/questions/39928/unable-to-set-default-input-and-output-audio-device-on-raspberry-jessie