最終更新:2024-10-31 (木) 02:50:25 (243d)  

ALSA/階層構造
Top / ALSA / 階層構造

Card 0 (例: 内蔵サウンドカード)
│
├── Device 0 (例: Playback)
│   ├── Subdevice 0 (例: スピーカーのストリーム)
│   └── Subdevice 1 (例: ヘッドフォンのストリーム)
│
└── Device 1 (例: Capture)
    ├── Subdevice 0 (例: マイクのストリーム)
    └── Subdevice 1 (例: ラインインのストリーム)

Card 1 (例: USBサウンドカード)
│
├── Device 0 (例: Playback)
│   ├── Subdevice 0
│   └── Subdevice 1
│
└── Device 1 (例: Capture)
    └── Subdevice 0

Linux/proc/asound/cards

  • ALSA/カードを列挙: snd_card_next 
    $ cat /proc/asound/cards 
 0 [I82801AAICH    ]: ICH - Intel 82801AA-ICH
                      Intel 82801AA-ICH with AD1980 at irq 21
↑

Linux/proc/asound/devices

  • ALSA/デバイス内のALSA/サブデバイスを列挙
  • マイナー番号: [カード番号-サブデバイス番号] 
    $ cat /proc/asound/devices 
  1:        : sequencer
  2: [ 0- 0]: digital audio playback
  3: [ 0- 0]: digital audio capture
  4: [ 0- 1]: digital audio capture
  5: [ 0]   : control
 33:        : timer
↑

aplay -l

  • ALSA/デバイスを列挙: snd_ctl_pcm_next_device?
  • ALSA/サブデバイスを列挙 
    $ aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: I82801AAICH [Intel 82801AA-ICH], device 0: Intel ICH [Intel 82801AA-ICH]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
↑

arecord -l? 

  • $ arecord -l
**** List of CAPTURE Hardware Devices ****
card 0: I82801AAICH [Intel 82801AA-ICH], device 0: Intel ICH [Intel 82801AA-ICH]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 0: I82801AAICH [Intel 82801AA-ICH], device 1: Intel ICH - MIC ADC [Intel 82801AA-ICH - MIC ADC]
  Subdevices: 1/1
  Subdevice #0: subdevice #0



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