동일한 이름을 가진 많은 오디오 장치: asound.conf에서 어떻게 사용합니까?

ALSA에서 새로운 PCM 장치를 만들고 싶습니다. 덕분에ALSA PCM 플러그인존재하다 /etc/asound.conf:

pcm.blah {
  type rate
  slave {
    pcm <device1>
    rate 48000
  }
}

그런데 이름이 뭐예요 <device1>?

이렇게 하면 aplay -L동일한 이름을 가진 여러 장치가 표시됩니다(아래 참조).

선택하는 방법정확하게하나의 장치에 asound.conf여러 장치의 이름이 같은 것 같나요?default(예를 들어 아래 목록에는 최소 3개 이상의 장치가 있습니다)

root@samplerbox:~# aplay -L
null
    Discard all samples (playback) or generate zero samples (capture)
blah
default:CARD=ALSA
    bcm2835 ALSA, bcm2835 ALSA
    Default Audio Device
sysdefault:CARD=ALSA
    bcm2835 ALSA, bcm2835 ALSA
    Default Audio Device
dmix:CARD=ALSA,DEV=0
    bcm2835 ALSA, bcm2835 ALSA
    Direct sample mixing device
dmix:CARD=ALSA,DEV=1
    bcm2835 ALSA, bcm2835 IEC958/HDMI
    Direct sample mixing device
dsnoop:CARD=ALSA,DEV=0
    bcm2835 ALSA, bcm2835 ALSA
    Direct sample snooping device
dsnoop:CARD=ALSA,DEV=1
    bcm2835 ALSA, bcm2835 IEC958/HDMI
    Direct sample snooping device
hw:CARD=ALSA,DEV=0
    bcm2835 ALSA, bcm2835 ALSA
    Direct hardware device without any conversions
hw:CARD=ALSA,DEV=1
    bcm2835 ALSA, bcm2835 IEC958/HDMI
    Direct hardware device without any conversions
plughw:CARD=ALSA,DEV=0
    bcm2835 ALSA, bcm2835 ALSA
    Hardware device with all software conversions
plughw:CARD=ALSA,DEV=1
    bcm2835 ALSA, bcm2835 IEC958/HDMI
    Hardware device with all software conversions
default:CARD=DAC
    USB Audio DAC, USB Audio
    Default Audio Device
sysdefault:CARD=DAC
    USB Audio DAC, USB Audio
    Default Audio Device
front:CARD=DAC,DEV=0
    USB Audio DAC, USB Audio
    Front speakers
surround21:CARD=DAC,DEV=0
    USB Audio DAC, USB Audio
    2.1 Surround output to Front and Subwoofer speakers
surround40:CARD=DAC,DEV=0
    USB Audio DAC, USB Audio
    4.0 Surround output to Front and Rear speakers
surround41:CARD=DAC,DEV=0
    USB Audio DAC, USB Audio
    4.1 Surround output to Front, Rear and Subwoofer speakers
surround50:CARD=DAC,DEV=0
    USB Audio DAC, USB Audio
    5.0 Surround output to Front, Center and Rear speakers
surround51:CARD=DAC,DEV=0
    USB Audio DAC, USB Audio
    5.1 Surround output to Front, Center, Rear and Subwoofer speakers
surround71:CARD=DAC,DEV=0
    USB Audio DAC, USB Audio
    7.1 Surround output to Front, Center, Side, Rear and Woofer speakers
iec958:CARD=DAC,DEV=0
    USB Audio DAC, USB Audio
    IEC958 (S/PDIF) Digital Audio Output
dmix:CARD=DAC,DEV=0
    USB Audio DAC, USB Audio
    Direct sample mixing device
dsnoop:CARD=DAC,DEV=0
    USB Audio DAC, USB Audio
    Direct sample snooping device
hw:CARD=DAC,DEV=0
    USB Audio DAC, USB Audio
    Direct hardware device without any conversions
plughw:CARD=DAC,DEV=0
    USB Audio DAC, USB Audio
    Hardware device with all software conversions
default:CARD=LPD8
    Default Audio Device
sysdefault:CARD=LPD8
    Default Audio Device