显示我的声卡信息：
aplay -L
default
Playback/recording through the PulseAudio sound server
null
Discard all samples (playback) or generate zero samples (capture)
jack
JACK Audio Connection Kit
pulse
PulseAudio Sound Server
mpd
sysdefault:CARD=Generic_1
HD-Audio Generic, ALC662 rev3 Analog
Default Audio Device
front:CARD=Generic_1,DEV=0
HD-Audio Generic, ALC662 rev3 Analog
Front speakers
surround21:CARD=Generic_1,DEV=0
HD-Audio Generic, ALC662 rev3 Analog
2.1 Surround output to Front and Subwoofer speakers
surround40:CARD=Generic_1,DEV=0
HD-Audio Generic, ALC662 rev3 Analog
4.0 Surround output to Front and Rear speakers
surround41:CARD=Generic_1,DEV=0
HD-Audio Generic, ALC662 rev3 Analog
4.1 Surround output to Front, Rear and Subwoofer speakers
surround50:CARD=Generic_1,DEV=0
HD-Audio Generic, ALC662 rev3 Analog
5.0 Surround output to Front, Center and Rear speakers
surround51:CARD=Generic_1,DEV=0
HD-Audio Generic, ALC662 rev3 Analog
5.1 Surround output to Front, Center, Rear and Subwoofer speakers
surround71:CARD=Generic_1,DEV=0
HD-Audio Generic, ALC662 rev3 Analog
7.1 Surround output to Front, Center, Side, Rear and Woofer speakers
iec958:CARD=Generic_1,DEV=0
HD-Audio Generic, ALC662 rev3 Digital
IEC958 (S/PDIF) Digital Audio Output
dmix:CARD=Generic_1,DEV=0
HD-Audio Generic, ALC662 rev3 Analog
Direct sample mixing device
dmix:CARD=Generic_1,DEV=1
HD-Audio Generic, ALC662 rev3 Digital
Direct sample mixing device
hw:CARD=Generic_1,DEV=0
HD-Audio Generic, ALC662 rev3 Analog
Direct hardware device without any conversions
hw:CARD=Generic_1,DEV=1
HD-Audio Generic, ALC662 rev3 Digital
Direct hardware device without any conversions
我不知道hw:CARD=Generic_1,DEV=0和之间有什么区别hw:CARD=Generic_1,DEV=1。
hw:CARD=Generic_1,DEV=0
HD-Audio Generic, ALC662 rev3 Analog
Direct hardware device without any conversions
hw:CARD=Generic_1,DEV=1
HD-Audio Generic, ALC662 rev3 Digital
Direct hardware device without any conversions