Java Card technology provides a secure environment for applications that run on smart cards and other devices with very limited memory and processing capabilities. Multiple applications can be deployed on a single card, and new ones can be added to it even after it has been issued to the end user. Java Sound Technology The Java Platform includes a powerful API for capturing, processing, and playing back audio and MIDI (Musical Instrument Digital Interface) data. This API is supported by an efficient sound engine which guarantees high-quality audio mixing and MIDI synthesis capabilities for the platform.

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Virtins Sound Card MultiInstrument is a powerful PC based virtual instrument software. It consists of a sound card real time oscilloscope, a sound card real time spectrum analyzer and a sound card signal generator, and can run them simultaneously.

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Download Javs Sound Cards & Media Devices Drivers

Download Javs Sound Cards & Media Devices Driver

Playing Sound

JavaSE, via Java Sound API (in packages javax.sound), supports two types of audio:

• Sampled Audio: Sampled audio is represented as a sequence of time-sampled data of the amplitude of sound wave. It is supported in package javax.sound.sampled. The supported file formats are: 'wav', 'au' and 'aiff'. The samples can be either 8-bit or 16-bit, with sampling rate from 8 kHz to 48 kHz.
• Musical Instrument Digital Interface (MIDI): MIDI music is synthesized from musical notes and special sound effects, instead of time-sampled, like a recipe for creating musical sound. MIDI is supported in package javax.sound.midi.

Java Sound API also include a software sound mixer that supports up to 64 channels for sound effect and background music.

Java Media Framework (JMF), which is not part of JavaSE, is needed to support MP3 and advanced features. JOAL (Java Bindings on OpenAL) supports 3D sound effect.

Sampled Audio

To play sampled audio, you create an instance of a SourceDataLine or a Clip, which acts as a source to the software audio mixer. Audio samples are then loaded into it, and delivered to the mixer. The mixer may mix the samples with those from other sources and then deliver the mix to a target (usually an audio output device on a sound card).

javax.sound.Clip

Code Example:

The steps of playing sounds via Clip are:

1. Allocate a AudioInputStream piped from a file or URL, e.g.,
2. Allocate a sound Clip resource via the static method AudioSystem.getClip():
3. Open the clip to load sound samples from the audio input stream opened earlier:
4. You can now play the clip by invoking either the start() or loop() method
5. You can stop the player by invoking stop(), which may be useful to stop a continuous loop().

Playing Sound Effects for Java Games

A typical game requires various sound effects, e.g., move, eat, shoot, kill, gameover, and etc. The following enumeration encapsulates all the sound effects in a single class, to simplify game programming.

Dissecting the Program

[PENDING]

Dissecting the Program

[PENDING]

(optional) javax.sound.SourceDataLine

A source data line acts as a source to the audio mixer. Unlike Clip (which pre-load the audio samples), an application writes audio samples to a source data line, which handles the buffering of the bytes and delivers them to the mixer, in a streaming manner.

MIDI Synthesized Sound

In a computer game, MIDI can be used for providing the background music, as it save you quite a bit of bandwidth if you are downloading the file from a slow connection. Java Sound API supports three types of MIDI: MIDI Type 1, MIDI Type 2 and Rich Music Format (RMF).

The steps are:

1. Allocate a Sequence piped from a MIDI file:
2. Allocate a Sequencer to play a MIDI sequence:
3. Set the current sequence for the sequencer to play:
4. Open the sequencer to load the sequence:
5. You could set the loop count via setLoopCount() and start playing the music by invoking start():
6. You can set the tempo (rate of play) via setTempoFactor(), which is useful in a computer game when the difficulty level is increased.
7. You can stop the play via stop():

Code Example

The method is declared static, as we only need one global copy, and no instance variable involved in the operation.

Notes: Windows Vista seems to have lot of problems with Midi.

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MP3 & Java Media Framework (JMF)

Java Media Framework (JMF) is not part of JavaSE, but can be downloaded from http://java.sun.com/javase/technologies/desktop/media/jmf. JMF, among other things, provides support for playing MP3, AAC music. Download JMF and run the installation. Check to ensure that 'jmf.jar' is installed into '$JAVA_HOMEjrelibext'.

Example: Playing MP3 Music

[TODO] To be continued...

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REFERENCES & RESOURCES

• TODO

Download Javs Sound Cards & Media Devices Driver Windows 7

Latest version tested: JDK 1.6
Last modified: September 4, 2008