pixdisp/drivers/motionjpeg.js

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'use strict';
let { Driver } = require( './driver' );
let http = require( 'http' );
let mjpegServer = require( 'mjpeg-server' );
let jpeg = require( 'jpeg-js' );
let mjpegReqHandler = undefined;
let httpServer = undefined;
class MotionJPEG extends Driver {
constructor() {
super();
httpServer = http.createServer( function( req, res ) {
mjpegReqHandler = mjpegServer.createReqHandler( req, res );
} ).listen( 8081, '0.0.0.0' );
}
/**
* Writes the current buffer to the motionjpeg stream
*/
write( buffer = false ) {
if ( mjpegReqHandler === undefined) {
return;
}
buffer = new Buffer( this.width * this.height * 4 );
let i = 0;
let size = this.getSize();
for ( let y = 0; y < size.height; y++ ) {
for ( let x = 0; x < size.width; x++ ) {
buffer[ i++ ] = this.matrix[ x ][ y ].r * this.matrix[ x ][ y ].a * this.brightness;
buffer[ i++ ] = this.matrix[ x ][ y ].g * this.matrix[ x ][ y ].a * this.brightness;
buffer[ i++ ] = this.matrix[ x ][ y ].b * this.matrix[ x ][ y ].a * this.brightness;
buffer[ i++ ] = 0xFF;
}
}
// Buffor should be complete here
var imageData = {
data: buffer,
width: this.width,
height: this.height
};
var dt = jpeg.encode( imageData, 100 );
mjpegReqHandler.write( dt.data );
}
/**
* Close all http server requests
*/
cleanup() {
if ( httpServer !== undefined ) {
httpServer.close();
}
}
}
exports.MotionJPEG = MotionJPEG;