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Java Standard Edition (SE)

AudioFormat.Encoding


javax.sound.sampled

Class AudioFormat.Encoding

  • Enclosing class:
    AudioFormat


    public static class AudioFormat.Encoding
    extends Object
    The Encoding class names the specific type of data representation used for an audio stream. The encoding includes aspects of the sound format other than the number of channels, sample rate, sample size, frame rate, frame size, and byte order.

    One ubiquitous type of audio encoding is pulse-code modulation (PCM), which is simply a linear (proportional) representation of the sound waveform. With PCM, the number stored in each sample is proportional to the instantaneous amplitude of the sound pressure at that point in time. The numbers may be signed or unsigned integers or floats. Besides PCM, other encodings include mu-law and a-law, which are nonlinear mappings of the sound amplitude that are often used for recording speech.

    You can use a predefined encoding by referring to one of the static objects created by this class, such as PCM_SIGNED or PCM_UNSIGNED. Service providers can create new encodings, such as compressed audio formats, and make these available through the AudioSystem class.

    The Encoding class is static, so that all AudioFormat objects that have the same encoding will refer to the same object (rather than different instances of the same class). This allows matches to be made by checking that two format's encodings are equal.

    Since:
    1.3
    See Also:
    AudioFormat, FormatConversionProvider
    • Constructor Detail

      • Encoding

        public Encoding(String name)
        Constructs a new encoding.
        Parameters:
        name - the name of the new type of encoding
    • Method Detail

      • equals

        public final boolean equals(Object obj)
        Finalizes the equals method
        Overrides:
        equals in class Object
        Parameters:
        obj - the reference object with which to compare.
        Returns:
        true if this object is the same as the obj argument; false otherwise.
        See Also:
        Object.hashCode(), HashMap
      • toString

        public final String toString()
        Provides the String representation of the encoding. This String is the same name that was passed to the constructor. For the predefined encodings, the name is similar to the encoding's variable (field) name. For example, PCM_SIGNED.toString() returns the name "pcm_signed".
        Overrides:
        toString in class Object
        Returns:
        the encoding name


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