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Java™ Platform Standard Ed. 6 |
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java.lang.Object javax.sound.sampled.AudioFormat.Encoding
public static class AudioFormat.Encoding
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
class.
AudioSystem
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.
AudioFormat
,
FormatConversionProvider
Field Summary | |
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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 | |
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AudioFormat.Encoding(String name)
Constructs a new encoding. |
Method Summary | |
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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 |
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clone, finalize, getClass, notify, notifyAll, wait, wait, wait |
Field Detail |
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public static final AudioFormat.Encoding PCM_SIGNED
public static final AudioFormat.Encoding PCM_UNSIGNED
public static final AudioFormat.Encoding ULAW
public static final AudioFormat.Encoding ALAW
Constructor Detail |
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public AudioFormat.Encoding(String name)
name
- the name of the new type of encodingMethod Detail |
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public final boolean equals(Object obj)
obj
- the reference object with which to compare.
true
if this object is the same as the obj
argument; false
otherwise.Object.hashCode()
,
Hashtable
public final int hashCode()
Object.equals(java.lang.Object)
,
Hashtable
public final String toString()
String
representation of the encoding. This String
is
the same name that was passed to the constructor. For the predefined encodings, the name
is similar to the encoding's variable (field) name. For example, PCM_SIGNED.toString()
returns
the name "pcm_signed".
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Java™ Platform Standard Ed. 6 |
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Copyright 2006 Sun Microsystems, Inc. All rights reserved. Use is subject to license terms. Also see the documentation redistribution policy.