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Voice Instant Messenger

Voice Instant Messenger. Andrew Miller CS 491B Fall 2006 Professor Sun. Motivation. Wanted to do a project involving networking Avid user of voice and text messaging programs Wanted to do something different Thought it would be interesting. Motivation.

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Voice Instant Messenger

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  1. Voice Instant Messenger Andrew Miller CS 491B Fall 2006 Professor Sun

  2. Motivation • Wanted to do a project involving networking • Avid user of voice and text messaging programs • Wanted to do something different • Thought it would be interesting

  3. Motivation • Wanted to make something I could actually use • Wanted features in a program that I couldn’t find elsewhere, so I made my own

  4. Design • Networking • Audio • Recording • Encoding • Playback • Message Logging • Friends List • GUI

  5. Design - Networking • Server • Authenticates users • Serves as a router for packets between clients • Messages • Status Updates • Controls and maintains friends lists

  6. Design - Networking • Client • Connects to and communicates with the server • Sends and receives messages to and from other users • Sends friend updates to server to add and remove friends

  7. Design - Audio • Audio streams recorded from a user’s microphone • Sound playback of recorded or received audio streams • Encoded with the Speex Codec for good compression and quality

  8. Design - Message Logging • Saves information about sent or received messages: • Who sent it • Who received it • When it was sent or received (date and time) • Saves the message itself

  9. Design – Friends List • Shows all of the user’s friends • Can add and remove friends by name • Name formatted how the user wants with all spaces and capitalizations saved • Has a flag for user status – Away or Offline

  10. Design - GUI • Login Window • Prompts for username • Connects to server • Main Window • Friends List • Message List • Friend and Message Controls

  11. Design - GUI • Main Window (cont.) • Friend and Message Controls • Buttons to add and remove friends • Button to send messages to one or some friends • Buttons to play or delete messages • Button to filter message list, showing only messages from a specific friend

  12. Design - GUI • Message Frame • Shows all recipients for a current message • Can remove recipients from the list • Can send a message to one or all current recipients • Record, discard and preview message

  13. Implementation - Networking • Server • Uses a ServerSocket to accept incoming connections • Creates a new thread to handle client Sockets • Client • Connects to the server using a Socket • Uses DataInputStreams and DataOutputStreams to communciate with the server

  14. Implementation - Audio • Uses the JSpeex codec • Records to ByteArrayOutputStreams • Playback from ByteArrayInputStreams • Very odd implementation due to lack of JavaSound Support

  15. Implementation – Message Logging • Messages stored in message objects • ID of who sent the message • Array of IDs of who received it • String of date and time when the message was received • Had to create my own file type – VoIM Message File (.vmf)

  16. Implementation – Message Logging • VoIM Message File • int sender id • String date and time • int number of recipients • int array of recipient ids • int message length • byte array of the message

  17. Implementation – Friends List • Friends stored in friends objects • Friend ID • Name (formatted as the user wishes) • Status (online, offline, away) • Stored on the server, sent to client when it connects • Status packets update the client’s friends list

  18. Implementation - GUI • Java Swing and AWT Libraries • JLists • JButtons • JLabels • JFrames • JTabbedPane • JScrollPane • All layout done with SpringLayout

  19. Insights • Schedule • Sticking to a schedule is very difficult due to unforeseen problems • Creating a practical schedule is very important • Implementation • Research tools more in depth before starting work

  20. Insights • Implementation (cont.) • Java was a poor choice for both networking and sound • The JavaSound guy quit in 2004, there had been no further developments and no replacements afterward • Design • Planning is very important prior to coding, it’ll save a lot of time

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