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ラインインジャックからの録音

USBオーディオカードがマシンに接続されており、「ラインイン」から録音しようとしていますが、alsa（以下を参照）のキャプチャデバイスとして設定しているにもかかわらず、jackdが再生デバイスとして認識しているようですキャプチャとしてこの「ラインイン」にジャックを取得する方法。以下に示すように、ジャックにはカードの2つのマイク入力に相当する2つのキャプチャデバイスのみが表示されます。 「ラインイン」を含む3つのキャプチャが表示されると予想していました

#amixer -c1
    Simple mixer control 'Speaker',0
      Capabilities: pvolume pswitch pswitch-joined
      Playback channels: Front Left - Front Right - Rear Left - Rear Right - Front Center - Woofer - Side Left - Side Right
      Limits: Playback 0 - 197
      Mono:
      Front Left: Playback 65 [33%] [-24.75dB] [on]
      Front Right: Playback 65 [33%] [-24.75dB] [on]
      Rear Left: Playback 90 [46%] [-20.06dB] [on]
      Rear Right: Playback 90 [46%] [-20.06dB] [on]
      Front Center: Playback 90 [46%] [-20.06dB] [on]
      Woofer: Playback 90 [46%] [-20.06dB] [on]
      Side Left: Playback 90 [46%] [-20.06dB] [on]
      Side Right: Playback 90 [46%] [-20.06dB] [on]
    Simple mixer control 'PCM',0
      Capabilities: cvolume cswitch cswitch-joined
      Capture channels: Front Left - Front Right
      Limits: Capture 0 - 6928
      Front Left: Capture 4161 [60%] [0.25dB] [on]
      Front Right: Capture 4096 [59%] [-0.01dB] [on]
    Simple mixer control 'PCM Capture Source',0
      Capabilities: enum
      Items: 'Mic' 'Line' 'IEC958 In' 'Mixer'
      Item0: 'Mic'
    Simple mixer control 'Line',0
      Capabilities: pvolume cvolume pswitch pswitch-joined cswitch cswitch-joined
      Playback channels: Front Left - Front Right
      Capture channels: Front Left - Front Right
      Limits: Playback 0 - 8065 Capture 0 - 6928
      Front Left: Playback 6204 [77%] [0.23dB] [off] Capture 4547 [66%] [1.76dB] [on]
      Front Right: Playback 6071 [75%] [-0.29dB] [off] Capture 4215 [61%] [0.46dB] [on]
    Simple mixer control 'Mic',0
      Capabilities: pvolume cvolume pswitch pswitch-joined cswitch cswitch-joined
      Playback channels: Front Left - Front Right
      Capture channels: Front Left - Front Right
      Limits: Playback 0 - 8065 Capture 0 - 6928
      Front Left: Playback 6144 [76%] [-0.01dB] [off] Capture 4096 [59%] [-0.01dB] [on]
      Front Right: Playback 6144 [76%] [-0.01dB] [off] Capture 4096 [59%] [-0.01dB] [on]
    Simple mixer control 'IEC958 In',0
      Capabilities: cswitch cswitch-joined
      Capture channels: Mono
      Mono: Capture [off]


#aplay -L
default:CARD=Device
    USB Sound Device, USB Audio
    Default Audio Device
sysdefault:CARD=Device
    USB Sound Device, USB Audio
    Default Audio Device
front:CARD=Device,DEV=0
    USB Sound Device, USB Audio
    Front speakers
surround21:CARD=Device,DEV=0
    USB Sound Device, USB Audio
    2.1 Surround output to Front and Subwoofer speakers
surround40:CARD=Device,DEV=0
    USB Sound Device, USB Audio
    4.0 Surround output to Front and Rear speakers
surround41:CARD=Device,DEV=0
    USB Sound Device, USB Audio
    4.1 Surround output to Front, Rear and Subwoofer speakers
surround50:CARD=Device,DEV=0
    USB Sound Device, USB Audio
    5.0 Surround output to Front, Center and Rear speakers
surround51:CARD=Device,DEV=0
    USB Sound Device, USB Audio
    5.1 Surround output to Front, Center, Rear and Subwoofer speakers
surround71:CARD=Device,DEV=0
    USB Sound Device, USB Audio
    7.1 Surround output to Front, Center, Side, Rear and Woofer speakers
iec958:CARD=Device,DEV=0
    USB Sound Device, USB Audio
    IEC958 (S/PDIF) Digital Audio Output
dmix:CARD=Device,DEV=0
    USB Sound Device, USB Audio
    Direct sample mixing device
dsnoop:CARD=Device,DEV=0
    USB Sound Device, USB Audio
    Direct sample snooping device
hw:CARD=Device,DEV=0
    USB Sound Device, USB Audio
    Direct hardware device without any conversions
plughw:CARD=Device,DEV=0
    USB Sound Device, USB Audio
    Hardware device with all software conversions

#jack_lsp
    system:capture_1
    system:capture_2
    system:playback_1
    system:playback_2
    system:playback_3
    system:playback_4
    system:playback_5
    system:playback_6
    system:playback_7
    system:playback_8
soundalsajack
2
AShah

このカードには、単一のステレオキャプチャデバイスがあります。

このミキサーコントロールは、このデバイスを介して現在キャプチャされているものを選択します。

Simple mixer control 'PCM Capture Source',0
  Capabilities: enum
  Items: 'Mic' 'Line' 'IEC958 In' 'Mixer'
  Item0: 'Mic'
0
CL.