dennishall/app.js

## app.js
// stream media

// urls to consider:
// http://html5doctor.com/video-canvas-magic/
// http://stackoverflow.com/questions/1106955/php-and-ffmpeg-performing-intelligent-video-conversion
// http://stackoverflow.com/questions/6954845/how-to-create-a-webm-video-file
// http://johndyer.name/ffmpeg-settings-for-html5-codecs-h264mp4-theoraogg-vp8webm/
// http://blog.pcode.nl/2010/10/17/encoding-webm-using-ffmpeg/


var fs = require('fs');
var util = require('util');
var express = require('express');

var port = 9001;

var app = express.createServer();

app.requireAuth = false;

//generic config
app.configure(function(){
  app.set('views', __dirname + '/views');
  app.set('view engine', 'jade');
  app.use(express.bodyParser());
  app.use(express.cookieParser());
  app.use(express.session({ secret: 'topsecret' }));
  app.use(express.methodOverride());
  app.use(app.router);
  app.use(express.static(__dirname + '/public'));
});


app.get('/media/*', function(req, res){

  var file = 'media/' + req.params[0];

  // TODO - get file info :: bitrate
  var bitrate = 1048576; // 1M - rough guess at the bitrate of a 320x240 webm video
  // TODO - implement application logic to determine secnodsToBuffer
  var secondsToBuffer = 4;

  // console.log(util.inspect(req, showHidden=false, depth=2));
  // console.log(util.inspect(req.headers, showHidden=false, depth=0));

  var stat = fs.statSync(file);
  if (!stat.isFile()) return;
  var size = stat.size;

  var minChunkSize = secondsToBuffer * bitrate; // 512k (half a meg).
  var numChunks = 10;
  // can't get more than a 10th of the file at a time.
  var chunkSize = parseInt(size/numChunks, 10);
  if(chunkSize < minChunkSize){
    chunkSize = minChunkSize;
  }

  var start = 0;
  var end = 0;
  var range = req.header('Range');
  if (range != null) {
    start = parseInt(range.slice(range.indexOf('bytes=')+6, range.indexOf('-')), 10);
    end = parseInt(range.slice(range.indexOf('-')+1, range.length), 10);
  }
  if (isNaN(end) || end == 0){
    end = size - 1;
  }
  if(end - start > chunkSize){
    end = start + chunkSize;
  }
  if(end >= size){
    end = size - 1;
  }
  if (start > end) return;


  console.log('Browser requested bytes '+start+' to '+end+' of '+file);

  var date = new Date();

  res.writeHead(206, { // 206 is a partial http response
    // 'Date':date.toUTCString(),
    'Connection':'close',
    // 'Cache-Control':'private',
    // 'Content-Type':'video/webm',
    // 'Content-Length':end - start,
    'Content-Range':'bytes '+start+'-'+end+'/'+stat.size,
    // 'Accept-Ranges':'bytes',
    // 'Server':'CustomStreamer/0.0.1',
    'Transfer-Encoding':'chunked'
  });

  var stream = fs.createReadStream(file, { flags:'r', start:start, end:end });
  stream.pipe(res);
});

app.get(/^\/$/, function(req, res){
  //res.send('<!doctype html><html><head><title>node stream video</title></head><body style="background:#000;"><video controls autoplay style="display:block;margin:30px auto;box-shadow:0 0 20px #444;border-radius:10px;"><source src="/media/video.webm" type="video/webm"></video></body></html>');

  //render the index page
  res.render('index.jade', {
    locals: {
      title: 'node stream video',
      examples: []
    }
  });
});


app.listen(port);

process.on('uncaughtException', function(err) {
  console.log(err);
});
	// stream media

	// urls to consider:
	// http://html5doctor.com/video-canvas-magic/
	// http://stackoverflow.com/questions/1106955/php-and-ffmpeg-performing-intelligent-video-conversion
	// http://stackoverflow.com/questions/6954845/how-to-create-a-webm-video-file
	// http://johndyer.name/ffmpeg-settings-for-html5-codecs-h264mp4-theoraogg-vp8webm/
	// http://blog.pcode.nl/2010/10/17/encoding-webm-using-ffmpeg/


	var fs = require('fs');
	var util = require('util');
	var express = require('express');

	var port = 9001;

	var app = express.createServer();

	app.requireAuth = false;

	//generic config
	app.configure(function(){
	app.set('views', __dirname + '/views');
	app.set('view engine', 'jade');
	app.use(express.bodyParser());
	app.use(express.cookieParser());
	app.use(express.session({ secret: 'topsecret' }));
	app.use(express.methodOverride());
	app.use(app.router);
	app.use(express.static(__dirname + '/public'));
	});


	app.get('/media/*', function(req, res){

	var file = 'media/' + req.params[0];

	// TODO - get file info :: bitrate
	var bitrate = 1048576; // 1M - rough guess at the bitrate of a 320x240 webm video
	// TODO - implement application logic to determine secnodsToBuffer
	var secondsToBuffer = 4;

	// console.log(util.inspect(req, showHidden=false, depth=2));
	// console.log(util.inspect(req.headers, showHidden=false, depth=0));

	var stat = fs.statSync(file);
	if (!stat.isFile()) return;
	var size = stat.size;

	var minChunkSize = secondsToBuffer * bitrate; // 512k (half a meg).
	var numChunks = 10;
	// can't get more than a 10th of the file at a time.
	var chunkSize = parseInt(size/numChunks, 10);
	if(chunkSize < minChunkSize){
	chunkSize = minChunkSize;
	}

	var start = 0;
	var end = 0;
	var range = req.header('Range');
	if (range != null) {
	start = parseInt(range.slice(range.indexOf('bytes=')+6, range.indexOf('-')), 10);
	end = parseInt(range.slice(range.indexOf('-')+1, range.length), 10);
	}
	if (isNaN(end) \|\| end == 0){
	end = size - 1;
	}
	if(end - start > chunkSize){
	end = start + chunkSize;
	}
	if(end >= size){
	end = size - 1;
	}
	if (start > end) return;


	console.log('Browser requested bytes '+start+' to '+end+' of '+file);

	var date = new Date();

	res.writeHead(206, { // 206 is a partial http response
	// 'Date':date.toUTCString(),
	'Connection':'close',
	// 'Cache-Control':'private',
	// 'Content-Type':'video/webm',
	// 'Content-Length':end - start,
	'Content-Range':'bytes '+start+'-'+end+'/'+stat.size,
	// 'Accept-Ranges':'bytes',
	// 'Server':'CustomStreamer/0.0.1',
	'Transfer-Encoding':'chunked'
	});

	var stream = fs.createReadStream(file, { flags:'r', start:start, end:end });
	stream.pipe(res);
	});

	app.get(/^\/$/, function(req, res){
	//res.send('<!doctype html><html><head><title>node stream video</title></head><body style="background:#000;"><video controls autoplay style="display:block;margin:30px auto;box-shadow:0 0 20px #444;border-radius:10px;"><source src="/media/video.webm" type="video/webm"></video></body></html>');

	//render the index page
	res.render('index.jade', {
	locals: {
	title: 'node stream video',
	examples: []
	}
	});
	});



	app.listen(port);

	process.on('uncaughtException', function(err) {
	console.log(err);
	});