AxisCam motion detection with new Node streams Transform without prototypes

motion3.js

/**
 * Parses out motion data from the Axis camera motion stream
 * Implemented with the new Node streams
 */
var stream = require('stream'),
    util = require('util')

var MotionLevelStream = function() {
    stream.Transform.call(this, {objectMode: true})

    this._transform = function(data, encoding, cb) {
        var that = this
        // Important bit of the stream is: group=0;level=0;threshold=11;
        var match = data.toString().match(/group=\d+;level=\d+;threshold=\d+/g)
        if (match)
            match.forEach(function(motion) {
                var motionMatch = motion.match(/group=(\d+);level=(\d+);threshold=(\d+)/)
                that.push({ group: Number(motionMatch[1]),
                            level: Number(motionMatch[2]),
                            threshold: Number(motionMatch[3]),
                            ts: new Date })
            })
        cb()
    }

}

util.inherits(MotionLevelStream, stream.Transform)

exports.createStream = function() {
    return new MotionLevelStream()
}