一直使用arecord来录音
并且用aplay来播放，这次重装系统发现有问题
```
root@orangepipc:/tmp# aplay test.wav
Playing WAVE 'test.wav' : Unsigned 8 bit, Rate 8000 Hz, Mono
aplay: set_params:1299: Sample format non available
Available formats:
- S16_LE
- S24_LE
- S32_LE
- S20_3LE
```
记录一下
```
root@orangepipc:/tmp# apt-get install alsa-utils
root@orangepipc:/tmp# arecord -f cd -D hw:0,0 -d 10 test.wav
Recording WAVE 'test.wav' : Signed 16 bit Little Endian, Rate 44100 Hz, Stereo
root@orangepipc:/tmp# aplay test.wav
Playing WAVE 'test.wav' : Signed 16 bit Little Endian, Rate 44100 Hz, Stereo
root@orangepipc:/tmp#
```
