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UMMS Architecture
Contents |
UMMS Architecture
Introduction
This page describes the architecture of umms-0.1, you can get the code from: git://gitorious.org:meego-middleware/umms.git
UMMS general description can found on its main page
Class Diagram
- UmmsAudioManager
Class to implement com.UMMS.AudioManager interface which provide client with audio output control service.
- UmmsVideoOutput
Class to implement com.UMMS.VideoOutput interface which provide client with video output control service.
- UmmsPlayingContentMetadataViewer
Class to implement com.UMMS.PlayingContentMetadataViewer interface which allow the client to query the current playing content on server side.
- UmmsObjectManager
Class to manage MediaPlayer objects, including create/destory, register/unregister MediaPlayer objects.
- UmmsMediaPlayer
Class to implement the com.UMMS.MediaPlayer interface which provide media playback service for client.
- UmmsPlayerBackend
A base class which defined internal interface for media playback. UmmsMediaPlayer uses this class to handle the service request. Backend developer need to subclass it.
- UmmsAudioManagerBackend
A base class which defined internal interface for controlling audio output. UmmsAudioManager uses this class to handle the service request. Backend developer need to subclass it.
- UmmsVideoOutputBackend
A base class which defined internal interface for controlling video output. UmmsVideoOutput uses this class to handle the service request. Backend developer need to subclass it.
- UmmsPlugin
A class which defined the plugin mechanism. All backend should be implemented as a UmmsPlugin.
- Player
An implementation of UmmsPlayerBackend.
- AudioManger
An implementation of UmmsAudioBackend.
- VideoOutput
An implementation of UmmsVideoOutput.
Note that, Player,AudioManger,VideoOutput are plugins and will not provide by umms-1.0.
How to develop a backend
Suppose you are going to develop a player backend.
- Step 1: Subclass UmmsPlayerBackend
The UmmsPlayerBackend is internal interface to abstract all the media playback control. Backend developer should subclass this class and implement its vmethods. Of cause, you can just implement a subset of the virtual methods defined in UmmsPlayerBackendClass struct, e.g. For dvb player backend, it is optional to implement the "pause" method. If you want to add time-shifting feature for DVB playback, implementing "pause" method is a choice.
- Step 2: Define UmmsPlugin struct in your .c file