How do I read out the first 4 bytes in javascript, turn it into an integer and remove the rest?

Question

I need to transfer webcam data over the internet from one browser to another.

The webcam is displayed in a HTML5 canvas. Then I get its dataUrl, and turn i

Answer 1

You can use Blob.slice() method to get bytes.
See docs: https://developer.mozilla.org/en-US/docs/Web/API/Blob.slice

1)

var bytes = blob.slice(0,4);

2)

var arrayOfBytes = [];
for(var i=0;i

Note: I didn't test it!