Class 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:

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

Constructors

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

Methods

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)

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