Design and implement a media service for Ubuntu
Design and implement a media service for apps to call into to play video and audio on the Ubuntu platform.
Blueprint information
- Status:
- Not started
- Approver:
- Michael Frey
- Priority:
- High
- Drafter:
- Jim Hodapp
- Direction:
- Approved
- Assignee:
- Jim Hodapp
- Definition:
- Approved
- Series goal:
- Accepted for trusty
- Implementation:
-
Not started
- Milestone target:
-
ubuntu-14.04
- Started by
- Completed by
Whiteboard
vUDS Session Agenda:
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1. Brief overview of current music hub design and implementation
- MPRIS spec: http://
2. Discuss what music hub needs to morph into (a general media service)
3. Discuss some of the specific implementation tasks
4. Assign work items
5. Discuss the merge request (MR) process
Things to do to create a general media service:
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1) Change the general things that refer to music to media to accommodate both music and video
e.g. namespaces, class names, etc
2) Extend the GStreamer playbin implementation to setup a pipeline with both an audio and video sink
Things to discuss/figure out:
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1) Does this get wired up to QtMultimedia or to a new Qt MediaPlayer set of classes like what qtubuntu-media was?
2) Do we implement the MediaPlayer2 interface for 14.04 or for 14.10? Do we just focus on video for 14.04 or on filling out the interface set?
Architectural diagram:
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https:/
MPRIS interface relevance analysis:
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*Note: The design assumes for 14.04 for now, 14.10 is the target for the media service to be applied across all Ubuntu platforms
Methods:
MediaPlayer2 Interface:
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*Note - some of these may overlap with the URL handler for Ubuntu Touch; this needs to be resolved
raise() - Media player app or music player app are already opened but suspended in the background. This would bring the appropriate one to the foreground if the user presses a piece of media from the dash.
quit() - No obvious use case for Ubuntu Touch
Properties:
CanQuit - always returns false
Fullscreen - returns true if the app is truly fullscreen, otherwise false if the app is resized to show the parts of the shell
CanSetFullscreen - returns true
CanRaise - returns true
HasTrackList - returns true
Identity - returns the player's name from the corresponding .desktop file
DesktopEntry - returns the basename of the installed .desktop file
SupportedUriSchemes - returns an array of the protocol types that the player supports for playing media from
SupportedMimeTypes - returns an array of the mime types that the player supports
Player Interface:
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Methods:
Next() - already implemented, no changes needed
Previous() - already implemented, no changes needed
Pause() - already implemented, no changes needed
PlayPause() - already implemented, no changes needed
Stop() - already implemented, no changes needed
Play() - already implemented, no changes needed
Seek() - already implemented, no changes needed
SetPosition() - already implemented, no changes needed
OpenUri() - already implemented, no changes needed
Signals:
Seeked() - already implemented, no changes needed
Properties:
PlaybackStatus - already implemented, no changes needed
LoopStatus - already implemented, no changes needed
Rate - already implemented, no changes needed
Shuffle - already implemented, no changes needed
MetaData - already implemented, no changes needed
Volume - already implemented, no changes needed
Position - already implemented, no changes needed
MinimumRate - already implemented, no changes needed
MaximumRate - already implemented, no changes needed
CanGoNext - already implemented, no changes needed
CanGoPrevious - already implemented, no changes needed
CanPlay - already implemented, no changes needed
CanPause - already implemented, no changes needed
CanSeek - already implemented, no changes needed
CanControl - already implemented, no changes needed
Tracklist Interface:
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Methods:
GetTracksMetadata() - already implemented, no changes needed
AddTrack() - already implemented, no changes needed
RemoveTrack() - already implemented, no changes needed
GoTo() - already implemented, no changes needed
Signals:
TrackListReplaced - already implemented, no changes needed
TrackAdded - already implemented, no changes needed
TrackRemoved - already implemented, no changes needed
TrackMetadataCh
Properties:
Tracks - already implemented, no changes needed
CanEditTracks - already implemented, no changes needed
Playlists Interface:
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Currently not implemented and not going to implement for 14.04
Existing code reference:
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http://
Work Items
Work items for ubuntu-13.11:
[jhodapp] Talk to the media scanner team about integrating thumbnailer into media-hub: DONE
[rsalveti] powerd integration for media-hub: DONE
[jhodapp] General porting of music-hub to be a more general media-hub: DONE
[jhodapp] Add video support to music-hub: DONE
[jhodapp] platform-
[vthompson] Investigate and port music-app to use media-hub: INPROGRESS
Work items for ubuntu-14.04:
[jdstrand] Adjust the apparmor policy for music-hub: DONE
Dependency tree
* Blueprints in grey have been implemented.
