是否有可能保存在浏览器中的JavaScript纯音频流？ [英] Is it possible to save an audio stream with pure JavaScript in the browser?

问题描述

我想作一个网页，访问者可以通过点击链接（不活流，但它使用流的无线电档案链接），我想在纯JavaScript做，而无需在服务器后端存储的音频流浏览器。
我在其他地方FFmpeg的的JavaScript的端口，可以连接code和保存视频/音频在利用所谓的斑点浏览器。但是下载图书馆是巨大的，据我记得17 MB。其实我只需要流复制的音频流，而不是一个真正的编码过程。
我通常使用类似的命令来保存的程序：

 的ffmpeg -i http://stream.example.com/stream_20160518_0630.mp3 -c复制-t 3600 programme.mp3
 

我在想，是不是可以通过编译FFmpeg的子集成JavaScript它仅提供真正需要的数据流复制？

解决方案

  VAR音频=新的音频（）;
VAR毫秒=新MediaSource的（）;
变种块= [];
audio.src = URL.createObjectURL（毫秒）;ms.addEventListener（'sourceopen'，函数（E）{
    VAR sourceBuffer = ms.addSourceBuffer（'音频/ MPEG'）;
    VAR流;    功能泵（流）{
        返回stream.read（），那么（数据=方式＆gt; {
            chunks.push（data.value）            sourceBuffer.appendBuffer（data.value）;
        }）
    };    sourceBuffer.addEventListener（'updateend'，（）=＆GT; {
        泵（流）;
    }，FALSE）;    取（http://stream001.radio.hu:443/stream/20160606_090000_1.mp3）
        。然后（RES =＆GT;泵（流= res.body.getReader（）））    audio.play（）
}，FALSE）;//停止流，当你想和保存您拥有所有块
stopBtn.onclick =功能（）{
    VAR BLOB =新的斑点（块）
    的console.log（BLOB）
    //创建对象的URL，追加链接，触发点击下载
    //或的saveAs（BLOB，'stream.mp3'）的需要：https://github.com/eligrey/FileSaver.js
}
 

I would like to make a webpage where visitors can save audio streams by clicking on links (not live streams, but links from a radio archive which uses streams), I want to do this without a server backend with pure JavaScript in the browser. I read somewhere about the JavaScript port of FFMpeg, which can encode and save video / audio in the browser utilizing so called blobs. However download library is huge, as far as I remember 17 MB. In fact I would need only stream copying the audio streams, not a real encoding process. I usually use similar commands to save a programme:

ffmpeg -i http://stream.example.com/stream_20160518_0630.mp3 -c copy -t 3600 programme.mp3

I wonder, is it possible to compile a subset of FFMpeg into JavaScript which provides only the really needed stream copying?

解决方案

var audio = new Audio();
var ms = new MediaSource();
var chunks = [];
audio.src = URL.createObjectURL(ms);

ms.addEventListener('sourceopen', function(e) {
    var sourceBuffer = ms.addSourceBuffer('audio/mpeg');
    var stream;

    function pump(stream){
        return stream.read().then(data => {
            chunks.push(data.value)

            sourceBuffer.appendBuffer(data.value);
        })
    };

    sourceBuffer.addEventListener('updateend', () => {
        pump(stream);
    }, false);

    fetch("http://stream001.radio.hu:443/stream/20160606_090000_1.mp3")
        .then(res=>pump(stream = res.body.getReader()))

    audio.play()
}, false);

// stop the stream when you want and save all chunks that you have
stopBtn.onclick = function(){
    var blob = new Blob(chunks)
    console.log(blob)
    // Create object url, append to link, trigger click to download
    // or saveAs(blob, 'stream.mp3') need: https://github.com/eligrey/FileSaver.js
}

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