Provides the play and stop requests, as well as the Playing
and Stopped states.
PlayStop has no dependencies.
PlayStop may conflict with any other playback control sets, and
conflicts with any other feature providing an initial file-loaded
state.
Playing — playing audioThe state in which the audio source is actively playing. This state
should be reachable only from Stopped (via play).
Stopped — not playing audioThe state in which the audio source is stopped playing. This state
should be reachable from Playing (via stop), but may also be
reachable from any state representing a lack of audio source (for
example, Ejected from FileLoad).
This should be the initial state, unless a state is available
representing a lack of audio source, and the server starts without
any audio source loaded. (For example, if FileLoad and PlayStop
are both implemented, the initial state should be Ejected,
not Stopped).
For the purposes of FileLoad, Stopped is the initial file-loaded
state.
play — start playing audioplay
If the current state is Stopped, the current state should be
set to Playing and the audio source should begin playing. If
the audio source is a file, it should be played from its last stopped
position, or the beginning of the file if it has not been stopped
since loading.
stop — stop playing audiostop
If the current state is Playing, the current state should be
set to Stopped and the audio source should stop playing. If
the audio source is a file, its current position should be carried
over to any subsequent play command.
PlayStop provides no responses. Confirmation of the play and
stop requests is provided through the core STATE response.