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'},