IT. Expert System.

Java Standard Edition (SE)

AudioFileFormat


javax.sound.sampled

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:

    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
    • 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

      • 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


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