Sound with Java

1
Sound with Java
2
AudioClips

• You can create and play AudioClips from both
  applets and applications.
• Sound file formats you can play
• AIFF
• AU
• WAV
• MIDI (type 0 and type 1 files)
• RMF

3
Sound Engine

• Sound API (in many packages)
• enables high-quality telephony and video
  conferencing applications (Java 1.3)
• allows professional musicians and sound designers
  to develop new sounds delivered over the Internet
  and used with Java Sound (Java 1.3)
• allows us to quite easily play sound files (Java
  1.0) what we'll do now

4
java.applet.AudioClip

• AudioClip interface has these 3 methods
• void loop()
• Starts playing this audio clip in a loop
• void play()
• Starts playing this audio clip
• void stop()
• Stops playing this audio clip

5
construct a new clip with method
java.applet.Applet.newAudioClip

• Use newAudioClip from Applet class
• public
• static final AudioClip newAudioClip(URL url)
• Get an audio clip from the given URL
• Parameters
• url - points to the audio clip
• Returns
• the audio clip at the specified URL
• Since 1.2

6
Need a URL object

• public URL(String spec) throws MalformedURLExcepti
  on
• Creates a URL object from the String
  representation. This constructor is equivalent to
  a call to the two-argument constructor with a
  null first argument.
• Parameters
• spec - the String to parse as a URL.
• Throws
• MalformedURLException - If spec is an unknown
  protocol
• Need System.getProperty("user.dir") for a String
  representation of the current directory.
• Need "file" for files in disk, also need file
  name

7
try catch for new URL objects

• URL could be internet address or file name
• String fileName "boing.wav" // in current
  folder
• URL URLaddress null
• try
• URLaddress new URL("file" //get current
  folder
• System.getProperty("user.
  dir")
• "\\" fileName)
• catch (MalformedURLException mfurle)
• System.err.println("Bad URL " mfurle)
• // String argument "fileC\\mystuff\\boing.wav
  "

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newAudioClip returns AudioClip

• Finally, create the AudioClip object with play,
  stop, and loop methods
• java.applet.AudioClip soundClip
• Applet.newAudioClip(URLaddress)
• soundClip.play()
• // Careful with loop, how will you stop it?

9
Add sound to Five-Dice-Draw

• Need these imports
• import
• Also need to get the sound file in the correct
  folder
• http//www.geocities.com/SiliconValley/Byte/8867/p
  age6.html