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javascripthtmlblob

HTML5 / Javascript - DataURL to Blob & Blob to DataURL

I have a DataURL from a canvas that shows my webcam. I turn this dataURL into a blob using Matt's answer from here: How to convert dataURL to file object in javascript?

How do I convert this blob back into the same DataURL? I've spent a day researching this and I'm astouned this isn't documented better, unless I'm blind.

EDIT: There is 

var urlCreator = window.URL || window.webkitURL; 
var imageUrl = urlCreator.createObjectURL(blob);

but it only returns a really short URL that seems to point at a local file, but I need to send the webcam data over a network.

Solution

  • Nevermind, it ended up working after sticking to the instructions in this thread Display image from blob using javascript and websockets and making my server forward raw (yet) unmodified BinaryWebSocketFrames.

    Now I'm still fighting bad performance of the canvas (<1fp) but that might become subject of a new thread.