网络音频API：调度的声音和出口结构 [英] Web audio API: scheduling sounds and exporting the mix

问题描述

我已经检查网络音频API文档和教程，但没有安静想出如何处理这个问题。

I've been checking Web Audio API documentation and the tutorials but haven't quiet figured out how to approach this problem.

比方说，我通过XMLHtt prequest加载几个wav文件，然后创建buffersources。我知道什么时候开始播放precisely我可以安排。但是，如果我不想玩什么他们，而是要存储在缓冲区调度它们。

Let's say I load few wav files via XMLHttpRequest and then create buffersources. I know I can schedule when the playback starts precisely. But what if I don't want to play them, but instead want to store and schedule them in a buffer.

一个真实的例子：我想创建一个简单的音序器，你安排鼓和高于出口整体搭配，WAV（不使用RecorderJS或东西记录吧）。任何想法，图书馆？

A real example: I want to create a simple sequencer where you schedule drums and than export the whole mix to wav (without recording it using RecorderJS or something). Any ideas, libraries?

推荐答案

只是做了一件有点像这样。

Just did something a bit like this.

从本质上讲，你需要创建一个脱机方面：

Essentially, you'll need to create an offline context:

var offline = new webkitOfflineAudioContext(numChannels, lengthInSamples, sampleRate)

您将不得不重新使用这种新形势下所有的BufferSources：

You'll have to recreate all your BufferSources using this new context:

var newBufferSource = offline.createBufferSource();
newBufferSource.buffer = someAudioBuffer;
newBufferSource.connect(offline.destination);

然后安排您的播放：

Then schedule your playback:

newBufferSource.start(offline.currentTime + 10);

然后绑定到完整事件离线渲染：

offline.onComplete = function( ev ){
  doSomething(ev.renderedBuffer);
}

然后开始'渲染'：

Then start 'rendering':

offline.startRendering();

一旦你有了 ev.renderedBuffer ，你可以做任何你想用它。在我的应用程序，我有一个WAV EN codeR，我最后写自己 - 但你可以修改Recorder.js轻松地做同样的事情pretty

Once you have ev.renderedBuffer, you can do whatever you want with it. In my app, I have a WAV encoder that I ended up writing myself - but you could modify Recorder.js to do the same thing pretty easily.

刚刚抬头： webkitOfflineAudioContext 是铬只在瞬间。这里是如果你有兴趣的链接：<一个href=\"https://dvcs.w3.org/hg/audio/raw-file/tip/webaudio/specification.html#OfflineAudioContext-section\"相对=nofollow> OfflineAudioContext

Just a heads-up: webkitOfflineAudioContext is Chrome-only at the moment. Here's a link if you're interested: OfflineAudioContext

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