Streaming Audio Instant Messenger

1
(No Transcript)
2
Intro

• Alexei Miagkov
• researching GUI
• networking
• sound aspects of Java
• Walter Kammerer
• researching networking concepts
• documenting real-time media concepts
• general project planning

Researching, documenting, implementing GUI,
networking, and sound aspects of Java
3
(No Transcript)
4
Java

• Easier GUI application development
• Provides a higher-level interface to networking
  than C
• Cross-platform compatibility

5
How SAIM works
6
Decisions

• Java vs. C
• XML vs. clear text
• Polling vs. interrupts
• Multicast UDP vs. TCP sockets

7
SAIM Demo
8
Streaming Media

• What is streaming audio?
• Eliminates waiting - the sound plays as it is
  delivered
• User control over the audio stream - pause, move
  back or forward, stop at any time
• File doesnt take up disk space locally

9
How Streaming Audio Works

• Types of streaming audio
• On-demand
• Live
• Encoding audio
• Codec - compression/decompression scheme
• Compressed audio is
• Much smaller in size
• Lower quality
• Protocols used in streaming audio
• TCP (Transmission Control Protocol)
• Error correction can make the stream pause and
  sound unnatural
• UDP (User Datagram Protocol)
• Dropped packets have noticeable effect on sound
  but stream continues uninterrupted
• RTSP (Real-Time Streaming Protocol)
• New standard allows for more efficient audio and
  video streaming

10
Streaming Audio Applications

• Live broadcasts of events news, internet radio,
  sporting events
• Audio on demand recorded radio shows,
  interviews
• Entertainment music, radio, audio books
• Business applications Internet (IP) phone and
  audio conferencing

11
Java Sound

• Java Media Framework has features not available
  in Java Sound
• Many more available CODECs
• Support for stream synchronization
• Supports streaming protocols such as RTSP
• Java Sound advantages
• Buffering control
• Additional command over the control flow
• Control over the audio hardware
• Capable of processing MIDI files
• Easier to extend

12
Java Sound Demo
13
Summary

• Researched and Implemented
• GUI building with Swing
• Threads
• Multicast and Unicast socket networking
• Custom Java events
• Javas Remote Method Invocation
• Basics of Java Sound
• Real-time media over the Internet
• Functional instant messenger