录制 webaudio api 的音频上下文的声音 [英] Record sound of a webaudio api's audio context

问题描述

我在我的项目中使用网络音频 API.有没有办法记录发送到 webkitAudioContext.destination 的音频数据?.wav 文件正在我的浏览器中播放，因此应该有某种方法可以将该数据存储到 (.wav) 文件中.我知道这是可能的，但还没有找到任何解决方案:(recorder.js 可以帮助我，但到目前为止我发现它只录制麦克风实时输入，是否可以在 recorder.js 的帮助下录制我的音频(.wav 文件)?请帮忙

I am using web audio api in my project. Is there a way to record the audio data that's being sent to webkitAudioContext.destination? .wav files are playing in my browser, so there should be some way to store that data into a (.wav) file . i know this is possible, but not yet find any solution :( recorder.js can help me, but upto now i found it is only recording the microphone live input, is it possible to record my audio(.wav files) with the help of recorder.js? plz help

我正在使用此示例来记录 https://github.com/mattdiamond/Recorderjs

i am using this sample for recording https://github.com/mattdiamond/Recorderjs

推荐答案

我已经通过一个纯 WebAudio 解决方案(不需要 Recorderjs)设法实现了这一点.您可以看到它在我的 discJS 项目中完全运行并使用 相关源文件 看看我的完整代码是如何工作的.我想这仅与录制您自己以编程方式播放的 WebAudio 节点相关.

I have managed to achieve this through a pure WebAudio solution (no Recorderjs needed). You can see it working fully on my discJS project and use the relevant source file to see how my complete code is working. I imagine this is only relevant to recording WebAudio nodes that you are playing yourself programmatically.

首先，您需要一个 HTML 用作最终目的地.在本例中，我选择显示控件，以便用户可以轻松下载生成的文件.

First you will need an HTML <audio> to use as a final destination. In this case I choose to show the controls so that the user may easily download the resulting file.

<audio id='recording' controls='true'></audio>

现在是 Javascript mojo:

Now for the Javascript mojo:

const CONTEXT = new AudioContext();
var recorder=false;
var recordingstream=false;

function startrecording(){
  recordingstream=CONTEXT.createMediaStreamDestination();
  recorder=new MediaRecorder(recordingstream.stream);
  recorder.start();
}

function stoprecording(){
  recorder.addEventListener('dataavailable',function(e){
    document.querySelector('#recording').src=URL.createObjectURL(e.data);
    recorder=false;
    recordingstream=false;
  });
  recorder.stop();
}

现在的最后一点是，无论何时播放音频源，您还需要将其连接到您的录制流:

Now the final glue is that whenever you play an audio source, you also need to connect it to your recording stream:

function play(source){
  let a=new Audio(source);
  let mediasource=CONTEXT.createMediaElementSource(a);
  mediasource.connect(CONTEXT.destination);//plays to default context (speakers)
  mediasource.connect(recordingstream);//connects also to MediaRecorder
  a.play();
}

这是一个相对原始的设置，运行良好(在 Firefox 52 和 Chrome 70 上测试).有关更正确的实现，请参阅 MDN 上的 MediaRecorder.

This is a relatively primitive setup that works fine (tested on Firefox 52 and Chrome 70). For a more proper implementation, see MediaRecorder on MDN.

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