aplay -L
null
    Discard all samples (playback) or generate zero samples (capture)
sysdefault:CARD=sunxicodec
    sunxi-CODEC, sunxi PCM
    Default Audio Device
dmix:CARD=sunxicodec,DEV=0
    sunxi-CODEC, sunxi PCM
    Direct sample mixing device
dsnoop:CARD=sunxicodec,DEV=0
    sunxi-CODEC, sunxi PCM
    Direct sample snooping device
hw:CARD=sunxicodec,DEV=0
    sunxi-CODEC, sunxi PCM
    Direct hardware device without any conversions
plughw:CARD=sunxicodec,DEV=0
    sunxi-CODEC, sunxi PCM
    Hardware device with all software conversions