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Audio

Audio. Chapter 17 - Student. Audio Files. Java can play the following audio types: .au (Sun Audio) .wav (Windows Wave) .aif or .aiff (Macintosh AIFF) .mid (Musical Instrument Digital Interface (MIDI) .rmf.

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Audio

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  1. Audio Chapter 17 - Student

  2. Audio Files • Java can play the following audio types: • .au (Sun Audio) • .wav (Windows Wave) • .aif or .aiff (Macintosh AIFF) • .mid (Musical Instrument Digital Interface (MIDI) • .rmf Note: mp3 is NOT supported in the Java API. However, There are libraries you can download and use Note: wav files from your CDs are HUGE! Won’t run well – only use small WAV files (c) 2005 by Elizabeth Sugar Boese

  3. Audio getCodeBase works same for images as audio files AudioClip clip; clip = getAudioClip( getCodeBase( ), audioFilename ); clip.play( ); • There are three methods we can call on our AudioClip • play play the sound file once through • loop play the sound file continually • stop stop playing the file (c) 2005 by Elizabeth Sugar Boese

  4. Audio import java.awt.*; import java.applet.*; import javax.swing.*; public class AudioPlay extends JApplet { String audioFilename = "mySounds.mid"; AudioClip ac; public void init( ) { ac = getAudioClip( getCodeBase( ), audioFilename ); ac.play( ); } } (c) 2005 by Elizabeth Sugar Boese

  5. Audio To have sound clip loop: • get an AudioClip • call the loop( ) method import java.awt.*; import java.applet.*; import javax.swing.*; public class AudioPlay extends JApplet { String audioFilename = "mySounds.mid"; AudioClip ac; public void init( ) { ac = getAudioClip( getCodeBase( ), audioFilename ); ac.loop( ); } } (c) 2005 by Elizabeth Sugar Boese

  6. Audio: Need for stop( ) • See Example • Each button starts an audio file playing • If the previous one isn’t stopped first, then the new one plays on TOP of the other one • This is usually not desired However, some applications want this technique (see example of Singing Horses on Internet at: http://svt.se/hogafflahage/hogafflaHage_site/Kor/hestekor.swf (c) 2005 by Elizabeth Sugar Boese

  7. stop method Stop playing audio when user leaves the applet: • Write a stop method import java.awt.*; import java.applet.*; import java.awt.event.*; import javax.swing.*; public class LoopAudio extends JApplet { String audioFilename = "happyDaze.wav"; AudioClip ac; public void init( ) { ac = getAudioClip( getCodeBase( ), audioFilename ); ac.loop( ); // loop instead of play } public void stop( ) { if( ac != null )// can't stop it if it isn't running, check first ac.stop( ); } } (c) 2005 by Elizabeth Sugar Boese

  8. Summary • Supported audio file types • AudioClip • Methods on AudioClip • play • loop • stop • Need for stop( ) method (c) 2005 by Elizabeth Sugar Boese

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