how to know if the user's camera is broadcasting (he could have pressed deny instead of accept, or his camera might be turned off)

usually i do Camera.getCamera but when this method is called the user is prompted with a dialog box where he can choose to 开发者_如何学Callow or to deny the application access to the camera, or he could not have a camera

how can the application now whether the camera is broadcasting ?

The Camera class documentation on LiveDocs says:

Flash Player returns an information object in the status event that indicates the user's response: Camera.muted indicates the user denied access to a camera; Camera.Unmuted indicates the user allowed access to a camera. To determine whether the user has denied or allowed access to the camera without handling the status event, use the muted property.

Take a look at the StatusEvent class for more detail.