Detect if browser is buffering audio stream from mixcloud

My app embeds mixcloud's player widget. It's an embedded swf.

<object>
<embed src="http://www.mixcloud.com/media/swf/player/mixcloudLoader.swf?feed=x">
</embed>
</object>

If audio is presently streaming, then I want to alert any user who might click on one of my site's internal navigation links that the buffer will be lost if they continue.

Is there a way to detect whether or not the browser is buffering (or has finished buffering) a particular stream?

I think I need to distinguish between the objects that i开发者_StackOverflow社区nitialize the player (on page load), and the actual audio itself so that this alert only appears if the user has something playing or buffering.

Is there a js library that can help me here?