我的机器上连接了 USB 音频卡，我试图从“线路输入”录制，但 jackd 似乎将其视为播放设备，尽管我已将其设置为 alsa 中的捕获设备（见下文），有人知道我如何将 jack 作为捕获设备连接到此“线路输入”。正如您在下面看到的，jack 只看到 2 个捕获设备，相当于卡上的 2 个麦克风输入。我原本希望看到 3 个捕获，包括“线路输入”
#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
答案1
该卡有一个立体捕获设备。
该混频器控制器选择当前通过该设备捕获的内容：
Simple mixer control 'PCM Capture Source',0
Capabilities: enum
Items: 'Mic' 'Line' 'IEC958 In' 'Mixer'
Item0: 'Mic'