Recording audio in raspberry pi 3 using nodejs

In my previous blog I have mentioned how to configure the usb microphone in raspberry pi 3,

Now we will record 30 sec audio.

 var spawn = require('child_process').spawn;
var musicFileName = new Date().getTime() + '.wav'; // generating the music file name
var proces = spawn('arecord', ['-D', 'plughw:0,0', '-f', 'dat'].concat(musicFileName), {
                    cwd: /home/pi/Music
                }); // invoking the arecord command
proces.on('exit', function(code, sig) { // if arecord process success
                    if (code !== null && sig === null) {
                        // here /home/pi/Music/1482926811918.wav 
		//	now you can process this wav file as your requirement
                    }
                });
proces.stderr.on('data', function(data) {
                    console.log("music record stderr :" + data);
                });
                proces.stdout.on('data', function(data) {
                   console.log(' music record stdout data: ' + data);
                });
                setTimeout(function() {
                    proces.kill('SIGTERM');
                }, 30000);

By running this you will get audio file in Music folder. Now you can further process this wav file as your requirement. In next blog we will see how to configure ffmpeg on raspberry pi 3.

Thanks