Autismify/backend/livestream.js

var child_process 	= require("child_process");
var express			= require('express');
var url				= require('url');
var tagger			= require('./tagger');

var app = express();
app.get('/artist/:artist', function (req, resp) {
	var artist = req.params.artist;
	function f(a){
		resp.send(JSON.stringify(a));
	}
	tagger.getArtist(artist,f);
});
app.get('/song/:song', function (req, resp) {
    resp.writeHead(200, {
          "Connection": "keep-alive"
        , "Content-Type": "audio/ogg"
        , "Accept-Ranges": "bytes"                 // Helps Chrome
    });

	var song = req.params.song;
	if (isNumeric(song)){
		tagger.pathFromID(song, transcode);
	}else{
		transcode(song);
	}

	function transcode(path){
		console.log("Transcoding " + path);
   		transcoder = child_process.spawn("/usr/bin/ffmpeg", [ "-i",path,	"-c:a", "libvorbis", "-vn", "-b:a", "192k", "-f", "ogg", "-y", "-" ],  {detached: false});
   		transcoder.stdout.pipe(resp);

   		transcoder.stdout.on("data",function(data) { });
   		req.on("close", function () { shutStream("closed") })
   		req.on("end", function () { shutStream("ended") });

   		function shutStream(event) {
   		    if (typeof transcoder !== "undefined")
   		        transcoder.kill();
   		}
	}
    return true;
});

var server = app.listen(1337, function () {
});


function isNumeric(n) { return !isNaN(parseFloat(n)) && isFinite(n); }