Class AudioFileFormat

java.lang.Object
- javax.sound.sampled.AudioFileFormat

public class AudioFileFormat
extends Object

An instance of the AudioFileFormat class describes an audio file, including the file type, the file's length in bytes, the length in sample frames of the audio data contained in the file, and the format of the audio data.

The AudioSystem class includes methods for determining the format of an audio file, obtaining an audio input stream from an audio file, and writing an audio file from an audio input stream.

An AudioFileFormat object can include a set of properties. A property is a pair of key and value: the key is of type String, the associated property value is an arbitrary object. Properties specify additional informational meta data (like a author, copyright, or file duration). Properties are optional information, and file reader and file writer implementations are not required to provide or recognize properties.

The following table lists some common properties that should be used in implementations:

Audio File Format Properties
Property key	Value type	Description
"duration"	`Long`	playback duration of the file in microseconds
"author"	`String`	name of the author of this file
"title"	`String`	title of this file
"copyright"	`String`	copyright message
"date"	`Date`	date of the recording or release
"comment"	`String`	an arbitrary text

Since:: 1.3
See Also:: AudioInputStream

Nested Class Summary

Nested Classes
Modifier and Type	Class	Description
`static class`	`AudioFileFormat.Type`	An instance of the `Type` class represents one of the standard types of audio file.

Constructor Summary

Constructors
Modifier	Constructor	Description
`protected`	`AudioFileFormat(AudioFileFormat.Type type, int byteLength, AudioFormat format, int frameLength)`	Constructs an audio file format object.
	`AudioFileFormat(AudioFileFormat.Type type, AudioFormat format, int frameLength)`	Constructs an audio file format object.
	`AudioFileFormat(AudioFileFormat.Type type, AudioFormat format, int frameLength, Map<String,Object> properties)`	Construct an audio file format object with a set of defined properties.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`int`	`getByteLength()`	Obtains the size in bytes of the entire audio file (not just its audio data).
`AudioFormat`	`getFormat()`	Obtains the format of the audio data contained in the audio file.
`int`	`getFrameLength()`	Obtains the length of the audio data contained in the file, expressed in sample frames.
`Object`	`getProperty(String key)`	Obtain the property value specified by the key.
`AudioFileFormat.Type`	`getType()`	Obtains the audio file type, such as `WAVE` or `AU`.
`Map<String,Object>`	`properties()`	Obtain an unmodifiable map of properties.
`String`	`toString()`	Provides a string representation of the file format.

Methods declared in class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

AudioFileFormat

protected AudioFileFormat(AudioFileFormat.Type type,
                          int byteLength,
                          AudioFormat format,
                          int frameLength)

Constructs an audio file format object. This protected constructor is intended for use by providers of file-reading services when returning information about an audio file or about supported audio file formats.

Parameters:: type - the type of the audio file; byteLength - the length of the file in bytes, or AudioSystem.NOT_SPECIFIED; format - the format of the audio data contained in the file; frameLength - the audio data length in sample frames, or AudioSystem.NOT_SPECIFIED
See Also:: getType()

AudioFileFormat

public AudioFileFormat(AudioFileFormat.Type type,
                       AudioFormat format,
                       int frameLength)

Constructs an audio file format object. This public constructor may be used by applications to describe the properties of a requested audio file.

Parameters:: type - the type of the audio file; format - the format of the audio data contained in the file; frameLength - the audio data length in sample frames, or AudioSystem.NOT_SPECIFIED

AudioFileFormat

public AudioFileFormat(AudioFileFormat.Type type,
                       AudioFormat format,
                       int frameLength,
                       Map<String,Object> properties)

Construct an audio file format object with a set of defined properties. This public constructor may be used by applications to describe the properties of a requested audio file. The properties map will be copied to prevent any changes to it.

Parameters:: type - the type of the audio file; format - the format of the audio data contained in the file; frameLength - the audio data length in sample frames, or AudioSystem.NOT_SPECIFIED; properties - a Map<String, Object> object with properties
Since:: 1.5

Method Detail

getType

public AudioFileFormat.Type getType()

Obtains the audio file type, such as WAVE or AU.

Returns:: the audio file type
See Also:: AudioFileFormat.Type.WAVE, AudioFileFormat.Type.AU, AudioFileFormat.Type.AIFF, AudioFileFormat.Type.AIFC, AudioFileFormat.Type.SND

getByteLength

public int getByteLength()

Obtains the size in bytes of the entire audio file (not just its audio data).

Returns:: the audio file length in bytes
See Also:: AudioSystem.NOT_SPECIFIED

getFormat

public AudioFormat getFormat()

Obtains the format of the audio data contained in the audio file.

Returns:: the audio data format

getFrameLength

public int getFrameLength()

Obtains the length of the audio data contained in the file, expressed in sample frames.

Returns:: the number of sample frames of audio data in the file
See Also:: AudioSystem.NOT_SPECIFIED

properties

public Map<String,Object> properties()

Obtain an unmodifiable map of properties. The concept of properties is further explained in the class description.

Returns:: a Map<String, Object> object containing all properties. If no properties are recognized, an empty map is returned.
Since:: 1.5
See Also:: getProperty(String)

getProperty

public Object getProperty(String key)

Obtain the property value specified by the key. The concept of properties is further explained in the class description.

If the specified property is not defined for a particular file format, this method returns null.

Parameters:: key - the key of the desired property
Returns:: the value of the property with the specified key, or null if the property does not exist
Since:: 1.5
See Also:: properties()

toString

public String toString()

Provides a string representation of the file format.

Overrides:: toString in class Object
Returns:: the file format as a string