Three backends have been added, mopidy, vlc and mpg123. Depending on uri type an apporpriate service is selected when media playback is requested. (for example mopidy service can handle spotify://... and local://...)
A playback Control skill can pause, resume, stop change track, etc any started media. So for example if the NPR news skill used this after starting playing the news the user can say "Hey Mycroft, pause" and the playback will pause. The playback control also handles stuff like lowering the volume of the playback if mycroft is asked another question.
Currently the different backend runs under the playbeck control, this was made most for convenience and the services should be moved in the future.
Usage:
The user needs to import the audioservice interface
`from mycroft.skills.audioservice import AudioService`
and initialize an instance in the skill `initialize` method
`self.audio_service = AudioService(self.emitter)`
Then playing an uri is as simple as
`self.audio_service.play(uri)`
TODO:
* Configuration (Alias for the different backends, service specific config, active services, etc.)
* Manual selection of backend (This is prepared in the audioservice interface biut not implemented)
* More feature complete audio service interface (playback control, get trackname etc)
* Separate audio services from the playback control
* Probably lots more
Åke Forslund