ALSA toos-aplay的使用
使用alsa的工具aplay录音
./arecord -f S16_LE -c 2 -r 8000 -d 20 8k.wav #录音:16bit 小端，立体声，采样率8K，时间20s
注：将aplay命名为arecord，或者使用aplay -C
{"help", 0, 0, 'h'},
{"version", 0, 0, OPT_VERSION},
{"list-devices", 0, 0, 'l'},
{"list-pcms", 0, 0, 'L'},
{"device", 1, 0, 'D'},
{"quiet", 0, 0, 'q'},
{"file-type", 1, 0, 't'},
{"channels", 1, 0, 'c'},
{"format", 1, 0, 'f'},
{"rate", 1, 0, 'r'},
{"duration", 1, 0 ,'d'},
{"sleep-min", 1, 0, 's'},
{"mmap", 0, 0, 'M'},
{"nonblock", 0, 0, 'N'},
{"period-time", 1, 0, 'F'},
{"period-size", 1, 0, OPT_PERIOD_SIZE},
{"avail-min", 1, 0, 'A'},
{"start-delay", 1, 0, 'R'},
{"stop-delay", 1, 0, 'T'},
{"buffer-time", 1, 0, 'B'},
{"buffer-size", 1, 0, OPT_BUFFER_SIZE},
{"verbose", 0, 0, 'v'},
{"separate-channels", 0, 0, 'I'},
{"playback", 0, 0, 'P'},
{"capture", 0, 0, 'C'},