JAVA Multimedia Support

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JAVA Multimedia Support

• Moinuddin Mohammed W.
• MSc Network System
• mmwaseem_at_hotmail.com

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Multimedia

• The Java Application Programming Interface (API)
  provides support for multimedia activities and
  Java Media API contains a set of multimedia
  classes that support a wide range of multimedia
  including audio, video, animation, images etc.

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Audio Support in Java

• Java programme can manipulate and play audio
  clips. There are two ways of playing sound in an
  Applet, one is Applets play( ) method and
  another the play( ) method from the AudioClip
  Interface. The first one load the audio clip and
  plays it once and second method allows audio to
  be stored in the program and can be reused
  throughout the program execution.

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Audio Support in Java (Contd.)

• We can create and play AudioClips from both
  Applets and Applications
• Three methods are invoked when an AudioClip is
  loaded
• play( ) method plays the audio once
• loop( ) method continuously plays the audio
• stop( ) method stop the audio clip

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Audio Support in Java (Contd.)

• //a simple program that play a audio file once
• import java.applet.
• Import java.awt.
• public class Sound extends Applet
• public void init( )
• play(getCodeBase( ), music.au)

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Audio Support in Java (Contd.)

• Java supports Musical Instrument Digital
  Interface (MIDI), it is not a actual recording as
  .wav file is. MIDI files are computer programs
  that instruct a synthesizer to produce sound. It
  transmits information how music is produced. An
  advantage is very small file size but the
  disadvantage is the low specific sound control.

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Images supported in Java

• Java supports file format end with (Graphics
  Interchange Format ).gif and ( Joint Photographic
  Expert Group) .jpeg and .jpg
• getImage( ) method loads the image, and to
  display a image one invokes the drawImage( )
  method of the Graphics object that is passed to
  the Applet paint( ) method

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Images supported in Java (Contd.)

• Every image is represented by a java.awt.Image
  object.
• To display a image using Graphics object a method
  named g.drawImage(image, 0, 0, this) is invoked
  where g is object of Graphics.

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Images supported in Java (Contd.)

• imageIcon( ) method determines if image is
  completely loaded into memory and only completed
  images should be displayed. Java also support
  Image map, image that has hot areas that can be
  clicked as hyper-reference.

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Java Media Player

• Comes with JMF
• Can support
• Audio .au, .wav, .mid
• Video .avi, .gsm, .mpg, .rtp

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Animation Support in Java

• Animation sequence in which a series of pre-drawn
  diagrams are displayed one after another that
  creates an animation.
• Java API provides support for animation.
• Java Development Kit (JDK) includes classes and
  methods that help to load and manipulate
  animation.
• Classes like Applet, Image, Graphics play
  important role for making animations.

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Video Support in Java

• Basically there are two types of video
• Standard video that must be downloaded before
  playing it on Internet.
• These type of videos are depend upon size of
  the file and bandwidth available.
• Instead of downloading large file frames of
  video are buffered and begin playing the video,
  as more frames are placed into the buffer.

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Video Support in Java (Contd.)

• Giving support for video in java requires the
  some standard movie file format like .au etc.
  Streaming video is best way for low bandwidth
  connections.

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References

• Http//sun.java.com
• Cay S. Horstmann, Gary Cornell (2000), Core JAVA.
  Volume II-Advanced Features, Sun Mirosystems inc.
  Cal. U.S.