节点 - 无法搜索音频流

Question

我创建了一个简单的服务器,它使用fs模块将mp3文件流式传输到浏览器,该浏览器在html5音频元素中播放它.实际上,音频流完全正常,但是,即使我寻求的部分已经被缓冲,我也无法通过流来寻找.

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

app.get('/', function (req, res) {
    var filePath = 'music.mp3';
    var stat = fs.statSync(filePath);

    res.writeHead(200, {
        'Content-Type': 'audio/mpeg',
        'Content-Length': stat.size,
    });

    var readStream = fs.createReadStream(filePath);
    readStream.pipe(res);
});

其他类似的Q&As建议添加Content-Range标头,但我找不到如何做到这一点的简单示例.其他人已经说过使用206 Partial-Content标题,但是当我这样做时,音频根本不会播放.

这是一个演示(在Windows上测试Chrome)

Answer 1

调整了此问题中未接受的答案之一的代码:

var express = require('express'),
    fs = require('fs'),
    app = express()

app.get('/', function (req, res) {
    var filePath = 'music.mp3';
    var stat = fs.statSync(filePath);
    var total = stat.size;
    if (req.headers.range) {
        var range = req.headers.range;
        var parts = range.replace(/bytes=/, "").split("-");
        var partialstart = parts[0];
        var partialend = parts[1];

        var start = parseInt(partialstart, 10);
        var end = partialend ? parseInt(partialend, 10) : total-1;
        var chunksize = (end-start)+1;
        var readStream = fs.createReadStream(filePath, {start: start, end: end});
        res.writeHead(206, {
            'Content-Range': 'bytes ' + start + '-' + end + '/' + total,
            'Accept-Ranges': 'bytes', 'Content-Length': chunksize,
            'Content-Type': 'video/mp4'
        });
        readStream.pipe(res);
     } else {
        res.writeHead(200, { 'Content-Length': total, 'Content-Type': 'audio/mpeg' });
        fs.createReadStream(filePath).pipe(res);
     }
});