[Plugin: Audio Player] standalone player changing to in url, breaking s3 signed urls

Hi,
I’m trying to use the standalone player to play mp3 content that is in Amazon S3.

The urls I am giving the player are signed urls, which means they contain a signature based on part of the url (the path to the song) and my Amazon Web Services secret key.
If part of the URL changes, the signed URL will no longer be valid.

The standalone player seems to be changing + signs in my urls to %20.
For example:

https://mybucket.s3.amazonaws.com/my-music/my+song.mp3?AWSAccessKeyId=myaccesskey&Expires=1286289312&SignatureMethod=HmacSHA256&SignatureVersion=2&Signature=I%2Fag3m5zZwqF9Pyo9ui8WT%2FVMNs%3D

becomes:

https://mybucket.s3.amazonaws.com/my-music/my%20song.mp3?AWSAccessKeyId=myaccesskey&Expires=1286289312&SignatureMethod=HmacSHA256&SignatureVersion=2&Signature=I%2Fag3m5zZwqF9Pyo9ui8WT%2FVMNs%3D

(all that’s changed is the + becomes a %20)

This fails because Amazon is trying to take the string “/my-music/my%20song.mp3”, and create a signature with it and my secret key. If that signature doesn’t match the signature in my url, the request fails.

Can the player be made to not change + to %20?

Thanks