使用nodejs和Express进行视频流传输

时间:2016-02-14 06:16:45

标签: node.js html5 express

我尝试使用nodejs和express将视频流式传输到html5视频播放器。很多人之前已经从我能找到的东西中做到了这一点,但是很少有人使用过express(在我发现的内容中)。

大多数人说这样做:

var express = require('express');
var request = require('request');
var stylus  = require('stylus');
var fs      = require('fs');
var path    = require('path');
var url     = require('url');
var http    = require('http');

var app = express();

app.use(stylus.middleware({
 // Source directory
     src: __dirname + '/assets/stylesheets',
     // Destination directory
     dest: __dirname + '/public',
     // Compile function
     compile: function(str, path) {
       return stylus(str)
         .set('filename', path)
         .set('compress', true);
         }
     }));

app.enable('trust proxy');
// Routing to the user
app.use(express.static(__dirname + "/public"));

var server = require('http').createServer(app);
// var io = require('socket.io')(server);
var port = process.env.PORT || 3000;

server.listen(port, function() {
    console.log("Server is listening on port " + port.toString());
});


app.post('/playVideo', function(req, res) {

    var video = req.query.video;

    var file = path.resolve(__dirname,video);
    var range = req.headers.range;


    var positions = range.replace(/bytes=/, "").split("-");
    var start = parseInt(positions[0], 10);

    fs.stat(file, function(err, stats) {
      var total = stats.size;
      var end = positions[1] ? parseInt(positions[1], 10) : total - 1;
      var chunksize = (end - start) + 1;

      res.writeHead(206, {
        "Content-Range": "bytes " + start + "-" + end + "/" + total,
        "Accept-Ranges": "bytes",
        "Content-Length": chunksize,
        "Content-Type": "video/avi"
      });

      var stream = fs.createReadStream(file, { start: start, end: end })
        .on("open", function() {
          stream.pipe(res);
        }).on("error", function(err) {
          res.end(err);
        });
    });
});

不幸的是,当我尝试这样做时,我无法获得req.headers对象。它未定义。我认为这是因为我使用了Express,尽管我必须假设Express仍然可以使用Express。

如何使用express获取标题?

谢谢!

1 个答案:

答案 0 :(得分:0)

我认为你应该使用中间件body-parser

以下是示例:

var express = require('express')
var bodyParser = require('body-parser')

var app = express()

// parse application/x-www-form-urlencoded
app.use(bodyParser.urlencoded({ extended: false }))

// parse application/json
app.use(bodyParser.json())