录音,转成rate 16000,单声道,16bit的音频pcm数据,发送到baidu asr识别
TBD, can reference to https://www.cnblogs.com/cpuimage/p/8905965.html https://blog.csdn.net/aa98865646/article/details/105435426
arecord -l
arecord -c 2 -D hw:1,0 -r 44100 -f S16_LE ./2.wav
aplay 2.wav
arecord -c 2 -D hw:1,0 -r 44100 -f S16_LE -t raw ./2.pcm
aplay -t raw -c 2 -f S16_LE -r 44100 2.pcm