Module java.desktop
Package javax.sound.sampled

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:

  • 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:

    • 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:

    • 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:

    • 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:

    • 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

      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:

    • 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