sgothel/joal — pull request #9 by magnen (2013-03-07 06:42:06+00:00)
Title: Adding method for retrieving the playing state of a Source.

In order to determine if a source is playing or not, it is necessary to retrieve the source state using the source ID. Since the source ID is not retrievable outside the Source itself, it is necessary for the Source to provide the API to retrieve the playing state.