AudioFormat.Encoding (Java 2 Platform SE 5.0) - JDK 5 Documentation v1.5.0, Java 2 SDK 英文文档

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Java^TM 2 Platform
Standard Ed. 5.0

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javax.sound.sampled
Class AudioFormat.Encoding

java.lang.Object
  javax.sound.sampled.AudioFormat.Encoding

Enclosing class:: AudioFormat

public static class AudioFormat.Encoding
extends Object
extends Object

The Encoding class names the specific type of data representation used for an audio stream. The encoding includes aspects of the sound format other than the number of channels, sample rate, sample size, frame rate, frame size, and byte order.

One ubiquitous type of audio encoding is pulse-code modulation (PCM), which is simply a linear (proportional) representation of the sound waveform. With PCM, the number stored in each sample is proportional to the instantaneous amplitude of the sound pressure at that point in time. The numbers are frequently signed or unsigned integers. Besides PCM, other encodings include mu-law and a-law, which are nonlinear mappings of the sound amplitude that are often used for recording speech.

You can use a predefined encoding by referring to one of the static objects created by this class, such as PCM_SIGNED or PCM_UNSIGNED. Service providers can create new encodings, such as compressed audio formats or floating-point PCM samples, and make these available through the AudioSystem class.

The Encoding class is static, so that all AudioFormat objects that have the same encoding will refer to the same object (rather than different instances of the same class). This allows matches to be made by checking that two format's encodings are equal.

Since:: 1.3
See Also:: AudioFormat, FormatConversionProvider

Field Summary

static AudioFormat.Encoding ALAW
          Specifies a-law encoded data.

static AudioFormat.Encoding PCM_SIGNED
          Specifies signed, linear PCM data.

static AudioFormat.Encoding PCM_UNSIGNED
          Specifies unsigned, linear PCM data.

static AudioFormat.Encoding ULAW
          Specifies u-law encoded data.

Constructor Summary

AudioFormat.Encoding(String name)
          Constructs a new encoding.

Method Summary

boolean equals(Object obj)
          Finalizes the equals method

int hashCode()
          Finalizes the hashCode method

String toString()
          Provides the String representation of the encoding.

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Field Summary
`static AudioFormat.Encoding`	`ALAW` Specifies a-law encoded data.
`static AudioFormat.Encoding`	`PCM_SIGNED` Specifies signed, linear PCM data.
`static AudioFormat.Encoding`	`PCM_UNSIGNED` Specifies unsigned, linear PCM data.
`static AudioFormat.Encoding`	`ULAW` Specifies u-law encoded data.

Constructor Summary
`AudioFormat.Encoding(String name)` Constructs a new encoding.

Method Summary
`boolean`	`equals(Object obj)` Finalizes the equals method
`int`	`hashCode()` Finalizes the hashCode method
`String`	`toString()` Provides the `String` representation of the encoding.

Methods inherited from class java.lang.Object
`clone, finalize, getClass, notify, notifyAll, wait, wait, wait`

Field Detail

PCM_SIGNED

public static final AudioFormat.Encoding PCM_SIGNED

Specifies signed, linear PCM data.

PCM_UNSIGNED

public static final AudioFormat.Encoding PCM_UNSIGNED

Specifies unsigned, linear PCM data.

ULAW

public static final AudioFormat.Encoding ULAW

Specifies u-law encoded data.

ALAW

public static final AudioFormat.Encoding ALAW

Specifies a-law encoded data.

Constructor Detail