1. D istributed M edia P layer Students: Ran Margolin & Dan Waxman Supervisor: Ittay Eyal

2. Project Objective

3. Theory - Log Synchronized Log - identical behavior. Log 1.Play 2.PauseStop 3.PausePlay 4.Stop Log 1.Play 2.PauseStop 3.PausePlay 4.Stop Synced Read/Execute Issue Broadcast

4. Theory – NCT (Network Clock Time) Commands executed synchronously. Log 1.11:03 - Play 2.11:07 - PauseStop 3.11:12 - PausePlay 4.11:13 - Stop Synced Read/Execute Issue Broadcast Synchronized Current Time (11:12) Log 1.11:03 - Play 2.11:07 - PauseStop 3.11:12 - PausePlay 4.11:13 - Stop Current Time (11:12)

5. Network Structure Identical privileges and control. Synchronization via broadcast messages & peer2peer exchange.

6. Software Design - Structure Broadcast command + retrieve song Using Database, retrieve song from hard drive Play Song + update GUI

7. Software Design - Modules DMP Controller DMP Controller Neighbor List Neighbor List Song List Media Player Log Listen Server NCT Controller NCT Controller Neighbor List Neighbor List Listen Server Clock GUI

8. Software Design – Design Patterns Observer – Sub modules inherit java.util.Observable Core modules implement java.util.Observer. Decorator – Used in GUI. Implemented using Swing library.

9. Software Design – Technologies JAVA Song library maintained using MySQL Media files played using Java Media Framework

10. Software Design – Data Types Used TreeSet – Inner implementation of NeighborList. ( log[n]) ArrayList – SongList transfer. MySQL – S ong library data (SongList).

11. Software Design – Inheritance/ Interface Interface Serializable- Transfer of data between users. Interface Observer/Class Obervable – Monitor & update changes between modules. Interface Comparable- Facilitate comparison in data structures.

12. Problems JMF non real-time oriented Workaround: Heuristic algorithms (partial results) Playback rate varies according to CPU workload

13. The End