Sound
Overview
Java Sound provides a very high-quality 64-channel audio rendering and
MIDI sound synthesis engine that
-
Enables consistent, reliable, high-quality audio on all Java platforms
-
Minimizes the impact of audio-rich web pages on computing resources
-
Reduces the need for high-cost sound cards by providing a software-only
solution that requires only a digital-to-analog converter (DAC)
-
Supports a wide range of audio formats
The new sound engine is integrated into the Java Virtual Machine as a
core library.
Using the Java Sound Engine
JDK 1.2 enables you to create and play AudioClips
from both applets and applications. The clips can be any of the
following audio file formats:
- AIFF
- AU
- WAV
- MIDI (type 0 and type 1 files)
- RMF
The sound engine can handle 8- and 16-bit audio data at virtually any
sample rate. In JDK 1.2 audio files are rendered at a sample rate of 22
kHz in 16-bit stereo. If the hardware doesn't support 16-bit data or
stereo playback, 8-bit or mono audio is output.
There's no need to worry about the impact of audio-rich Web pages on
computing resources. The Java Sound engine minimizes the use of a
system's CPU to process sound files. For example, a 24-voice MIDI file
uses only 20 percent of the CPU on a Pentium 90 MHz system.
Accessing the Java Sound Engine
A full-featured Java Sound API is under development. This API will
provide access to the underlying synthesis and rendering engine and
will enable the creation of high-quality telephony and video
conferencing applications. With the Java Sound API, professional
musicians and sound designers will be able to develop new sounds that
can be delivered over the Internet and used seamlessly with Java
Sound.
Java Sound and Java Media
Java Sound is part of the Java Media family, which addresses the
increasing demand for multimedia in the enterprise by providing a
unified, nonproprietary, platform-neutral solution for incorporating
time-based media, 2D fonts, graphics and images, speech input and
output, 3D models, and telephony in Java programs. By providing
standard players and integrating these supporting technologies, the
Java Media APIs enable developers to produce and to distribute
compelling, media-rich content.
Java Sound provides uniform access to underlying platform sound
capabilities, enabling Java programs to read and write sampled and
synthesized audio data. Higher-level services, such as compression,
decompression, synchronization, streaming, container read/write, and
network transport, are handled by the Java Media Framework (JMF). JMF
provides a simple, unified way for Java programs to synchronize and
display time-based data, such as audio and video. Sun's implementation
of JMF uses the Java Sound engine to render audio data.
For more information about JMF and the other Java Media technologies,
visit the
Java Media & CommunicationsotherIcon (outside of the tutorial) pages on the Sun Website.
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