# 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

  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()`
  Returns a string representation of the audio file format.

  ### Methods declared in class Object

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

- ## Constructor Details

  - ### 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 Details

  - ### 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()
    Returns a string representation of the audio file format.
    Overrides:
      `toString` in class `Object`
    Returns:
      a string representation of the audio file format