Class AudioFormat.Encoding
- java.lang.Object
-
- javax.sound.sampled.AudioFormat.Encoding
- Enclosing class:
- AudioFormat
public static class AudioFormat.Encoding 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 may be signed or unsigned integers or floats. 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, 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
Modifier and Type | Field | Description |
---|---|---|
static AudioFormat.Encoding | ALAW | Specifies a-law encoded data. |
static AudioFormat.Encoding | PCM_FLOAT | Specifies floating-point PCM 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
Constructor | Description |
---|---|
Encoding(String name) | Constructs a new encoding. |
Method Summary
Modifier and Type | Method | Description |
---|---|---|
boolean | equals(Object obj) | Indicates whether the specified object is equal to this encoding, returning |
int | hashCode() | Returns a hash code value for this encoding. |
String | toString() | Provides the |
Methods declared in 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.
PCM_FLOAT
public static final AudioFormat.Encoding PCM_FLOAT
Specifies floating-point PCM data.
- Since:
- 1.7
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
Encoding
public Encoding(String name)
Constructs a new encoding.
- Parameters:
-
name
- the name of the new type of encoding
Method Detail
equals
public final boolean equals(Object obj)
Indicates whether the specified object is equal to this encoding, returning true
if the objects are equal.
- Overrides:
-
equals
in classObject
- Parameters:
-
obj
- the reference object with which to compare - Returns:
-
true
if the specified object is equal to this encoding;false
otherwise - See Also:
-
Object.hashCode()
,HashMap
hashCode
public final int hashCode()
Returns a hash code value for this encoding.
- Overrides:
-
hashCode
in classObject
- Returns:
- a hash code value for this encoding
- See Also:
-
Object.equals(java.lang.Object)
,System.identityHashCode(java.lang.Object)
toString
public final String toString()
Provides the 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".