Multimedia - Java Programming Language - Lecture Slides, Slides of Computer Science

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Chapter 14: Multimedia

• Audio Files

• Playing Audio

• Running Audio on a Separate Thread

• Displaying Images

• Displaying a Sequence of Images

• Using MediaTracker

Audio Files

• Audio is stored in files. There are several

formats of audio files. JDK 1.2 can play

several audio file formats, including .wav

and .au files.

Using Audio Clips

• public AudioClip getAudioClip(URL url);
• public AudioClip getAudioClip(URL url, String name);

Either method creates an audio clip. Specify

String name to use a relative URL address.

• public abstract void play()
• public abstract void loop()
• public abstract void stop()

Use these methods to start the clip, play it

repeatedly, and stop the clip, respectively.

Example 14.

Incorporating Sound in

Applets

• Objective: Display a running clock and play

sound files to announce the time at every

minute.

ClockAppletWithAudio Run Applet Viewer

Displaying Images

Two methods are available for displaying

images:

Use the getImage() method to retrieve image files

and create Image objects.

Paint the images on the viewing area using the

drawImage() method.

Example 14.3: Displaying

Images in an Applet

• Objective: Display images in applets

DisplayImageApplet

Run Applet Viewer

Example 14.5: Using Image

Animation

• Objective: Simulate a movie by

displaying a sequence of images in a

control loop.

ImageAnimation

Run Applet Viewer

Note: Images may take several seconds to load.

Example 14.6: Using

MediaTracker

• Objective: Use the MediaTracker class to

load all the images before displaying them in

a sequence.

ImageAnimationUsingMediaTracker

Run Applet Viewer

Note: Images may take several seconds to load.