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우분투 리눅스 spdif 설정법

$ cat /proc/asound/devices
  2:        : timer
  3:        : sequencer
  4: [ 0- 2]: digital audio playback
  5: [ 0- 1]: digital audio capture
  6: [ 0- 0]: digital audio playback
  7: [ 0- 0]: digital audio capture
  8: [ 0]   : control
$ aplay -l
**** PLAYBACK 하드웨어 장치 목록 ****↵
0 카드: CK804 [NVidia CK804], 0 장치: Intel ICH [NVidia CK804]
  하위장치: 1/1
  하위장치 #0: subdevice #0
0 카드: CK804 [NVidia CK804], 2 장치: Intel ICH - IEC958 [NVidia CK804 - IEC958]
  하위장치: 1/1
  하위장치 #0: subdevice #0
$ aplay -L
front:CARD=CK804,DEV=0
    NVidia CK804, NVidia CK804
    Front speakers
    ...
iec958:CARD=CK804,DEV=0
    NVidia CK804, NVidia CK804 - IEC958
    IEC958 (S/PDIF) Digital Audio Output
null
    Discard all samples (playback) or generate zero samples (capture)

• DigitalOut