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Synchronized Media Player Project: Achieving Real-Time Playback Coordination

This project by students Ran Margolin and Dan Waxman, supervised by Ittay Eyal, explores a distributed media player that focuses on synchronized playback through network clock time (NCT) theory. It incorporates a design structure that includes presentation, logic, and data tiers, utilizing Java and MySQL for functionality. Key features involve identical user privileges, synchronized commands through broadcasting, and peer-to-peer exchanges. Challenges like non-real-time playback are mitigated using heuristic algorithms to maintain a consistent playback rate, ensuring smooth media experiences.

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Synchronized Media Player Project: Achieving Real-Time Playback Coordination

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Presentation Transcript

  1. Students: Ran Margolin & Dan Waxman Supervisor: Ittay Eyal Distributed Media Player

  2. Project Objective

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

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

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

  6. Software Design - Structure Presentation Tier User presses play Play Song + update GUI Broadcast command + retrieve song Logic Tier Using Database, retrieve song from hard drive Data Tier

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

  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 – Song 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

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