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

Project Objective

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

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)

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

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

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

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.

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

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

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.

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

The End