音频设备列表中0 1 7三个设备分别代表什么？
/ # cat /proc/asound/cards0 : rockchip_rk3308 - rockchip,rk3308-vad
rockchip,rk3308-vad
1 : rockchip_rk3308 - rockchip,rk3308-pcm
rockchip,rk3308-pcm
7 : Loopback - Loopback
Loopback 1
/ # arecord -l
**** List of CAPTURE Hardware Devices ****
card 0: rockchiprk3308v , device 0: dailink-multicodecs multicodec-0 []
Subdevices: 1/1
Subdevice #0: subdevice #0
card 1: rockchiprk3308p , device 0: dailink-multicodecs dummy_codec-0 []
Subdevices: 1/1
Subdevice #0: subdevice #0
card 7: Loopback , device 0: Loopback PCM
Subdevices: 8/8
Subdevice #0: subdevice #0
Subdevice #1: subdevice #1
Subdevice #2: subdevice #2
Subdevice #3: subdevice #3
Subdevice #4: subdevice #4
Subdevice #5: subdevice #5
Subdevice #6: subdevice #6
Subdevice #7: subdevice #7
card 7: Loopback , device 1: Loopback PCM
Subdevices: 7/8
Subdevice #0: subdevice #0
Subdevice #1: subdevice #1
Subdevice #2: subdevice #2
Subdevice #3: subdevice #3
Subdevice #4: subdevice #4
Subdevice #5: subdevice #5
Subdevice #6: subdevice #6
Subdevice #7: subdevice #7 声卡0 用于lineout 和耳机输出，同时也通过该声卡录制8通道的模拟Mic 输入，这样理解对吗？？？？
arecord 录音时指定的hw:0,0 是通过麦克风阵列选择不同通道进行录音的吗？？？？
声卡1 和7 loopback又有什么作用呢？？？ 根据rk3308-firefly.dtsi和rk3308-roc-cc-dmic-pdm_emmc.dts的描述
声卡0 是数字麦克阵列
声卡1是蓝牙
声卡7是回采
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