javax.sound.sampled

## Class AudioInputStream

- java.lang.Object
- - java.io.InputStream
  - - javax.sound.sampled.AudioInputStream

- All Implemented Interfaces:
    Closeable, AutoCloseable

      public class AudioInputStream
      extends InputStream

  An audio input stream is an input stream with a specified audio format and length. The length is expressed in sample frames, not bytes. Several methods are provided for reading a certain number of bytes from the stream, or an unspecified number of bytes. The audio input stream keeps track of the last byte that was read. You can skip over an arbitrary number of bytes to get to a later position for reading. An audio input stream may support marks. When you set a mark, the current position is remembered so that you can return to it later.

  The `AudioSystem` class includes many methods that manipulate `AudioInputStream` objects. For example, the methods let you:

  - obtain an audio input stream from an external audio file, stream, or URL
  - write an external file from an audio input stream
  - convert an audio input stream to a different audio format
  Since:
    1.3
  See Also:
    `AudioSystem`, `Clip.open(AudioInputStream)`

- - ### Field Summary

    Fields
    Modifier and Type | Field | Description
    --- | --- | ---
    `protected AudioFormat` | `format` | The format of the audio data contained in the stream.
    `protected long` | `frameLength` | This stream's length, in sample frames.
    `protected long` | `framePos` | The current position in this stream, in sample frames (zero-based).
    `protected int` | `frameSize` | The size of each frame, in bytes.

  - ### Constructor Summary

    Constructors
    Constructor | Description
    --- | ---
    `AudioInputStream(InputStream stream, AudioFormat format, long length)` | Constructs an audio input stream that has the requested format and length in sample frames, using audio data from the specified input stream.
    `AudioInputStream(TargetDataLine line)` | Constructs an audio input stream that reads its data from the target data line indicated.

  - ### Method Summary

    All Methods Instance Methods Concrete Methods
    Modifier and Type | Method | Description
    --- | --- | ---
    `int` | `available()` | Returns the maximum number of bytes that can be read (or skipped over) from this audio input stream without blocking.
    `void` | `close()` | Closes this audio input stream and releases any system resources associated with the stream.
    `AudioFormat` | `getFormat()` | Obtains the audio format of the sound data in this audio input stream.
    `long` | `getFrameLength()` | Obtains the length of the stream, expressed in sample frames rather than bytes.
    `void` | `mark(int readlimit)` | Marks the current position in this audio input stream.
    `boolean` | `markSupported()` | Tests whether this audio input stream supports the `mark` and `reset` methods.
    `int` | `read()` | Reads the next byte of data from the audio input stream.
    `int` | `read(byte[] b)` | Reads some number of bytes from the audio input stream and stores them into the buffer array `b`.
    `int` | `read(byte[] b, int off, int len)` | Reads up to a specified maximum number of bytes of data from the audio stream, putting them into the given byte array.
    `void` | `reset()` | Repositions this audio input stream to the position it had at the time its `mark` method was last invoked.
    `long` | `skip(long n)` | Skips over and discards a specified number of bytes from this audio input stream.

    - ### Methods inherited from class java.lang.Object

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

- - ### Field Detail

    - #### format

          protected AudioFormat format

      The format of the audio data contained in the stream.

    - #### frameLength

          protected long frameLength

      This stream's length, in sample frames.

    - #### frameSize

          protected int frameSize

      The size of each frame, in bytes.

    - #### framePos

          protected long framePos

      The current position in this stream, in sample frames (zero-based).

  - ### Constructor Detail

    - #### AudioInputStream

          public AudioInputStream(InputStream stream,
                                  AudioFormat format,
                                  long length)

      Constructs an audio input stream that has the requested format and length in sample frames, using audio data from the specified input stream.
      Parameters:
        `stream` - the stream on which this `AudioInputStream` object is based
        `format` - the format of this stream's audio data
        `length` - the length in sample frames of the data in this stream

    - #### AudioInputStream

          public AudioInputStream(TargetDataLine line)

      Constructs an audio input stream that reads its data from the target data line indicated. The format of the stream is the same as that of the target data line, and the length is AudioSystem#NOT_SPECIFIED.
      Parameters:
        `line` - the target data line from which this stream obtains its data.
      See Also:
        `AudioSystem.NOT_SPECIFIED`

  - ### Method Detail

    - #### getFormat

          public AudioFormat getFormat()

      Obtains the audio format of the sound data in this audio input stream.
      Returns:
        an audio format object describing this stream's format

    - #### getFrameLength

          public long getFrameLength()

      Obtains the length of the stream, expressed in sample frames rather than bytes.
      Returns:
        the length in sample frames

    - #### read

          public int read()
                   throws IOException

      Reads the next byte of data from the audio input stream. The audio input stream's frame size must be one byte, or an `IOException` will be thrown.
      Specified by:
        `read` in class `InputStream`
      Returns:
        the next byte of data, or -1 if the end of the stream is reached
      Throws:
        `IOException` - if an input or output error occurs
      See Also:
        `read(byte[], int, int)`, `read(byte[])`, `

        `

    - #### read

          public int read(byte[] b)
                   throws IOException

      Reads some number of bytes from the audio input stream and stores them into the buffer array `b`. The number of bytes actually read is returned as an integer. This method blocks until input data is available, the end of the stream is detected, or an exception is thrown.

      This method will always read an integral number of frames. If the length of the array is not an integral number of frames, a maximum of `b.length - (b.length % frameSize)` bytes will be read.

      Overrides:
        `read` in class `InputStream`
      Parameters:
        `b` - the buffer into which the data is read
      Returns:
        the total number of bytes read into the buffer, or -1 if there is no more data because the end of the stream has been reached
      Throws:
        `IOException` - if an input or output error occurs
      See Also:
        `read(byte[], int, int)`, `read()`, `available()`

    - #### read

          public int read(byte[] b,
                          int off,
                          int len)
                   throws IOException

      Reads up to a specified maximum number of bytes of data from the audio stream, putting them into the given byte array.

      This method will always read an integral number of frames. If `len` does not specify an integral number of frames, a maximum of `len - (len % frameSize)` bytes will be read.

      Overrides:
        `read` in class `InputStream`
      Parameters:
        `b` - the buffer into which the data is read
        `off` - the offset, from the beginning of array `b`, at which the data will be written
        `len` - the maximum number of bytes to read
      Returns:
        the total number of bytes read into the buffer, or -1 if there is no more data because the end of the stream has been reached
      Throws:
        `IOException` - if an input or output error occurs
      See Also:
        `read(byte[])`, `read()`, `skip(long)`, `available()`

    - #### skip

          public long skip(long n)
                    throws IOException

      Skips over and discards a specified number of bytes from this audio input stream.
      Overrides:
        `skip` in class `InputStream`
      Parameters:
        `n` - the requested number of bytes to be skipped
      Returns:
        the actual number of bytes skipped
      Throws:
        `IOException` - if an input or output error occurs
      See Also:
        `read()`, `available()`

    - #### available

          public int available()
                        throws IOException

      Returns the maximum number of bytes that can be read (or skipped over) from this audio input stream without blocking. This limit applies only to the next invocation of a `read` or `skip` method for this audio input stream; the limit can vary each time these methods are invoked. Depending on the underlying stream,an IOException may be thrown if this stream is closed.
      Overrides:
        `available` in class `InputStream`
      Returns:
        the number of bytes that can be read from this audio input stream without blocking
      Throws:
        `IOException` - if an input or output error occurs
      See Also:
        `read(byte[], int, int)`, `read(byte[])`, `read()`, `skip(long)`

    - #### close

          public void close()
                     throws IOException

      Closes this audio input stream and releases any system resources associated with the stream.
      Specified by:
        `close` in interface `Closeable`
      Specified by:
        `close` in interface `AutoCloseable`
      Overrides:
        `close` in class `InputStream`
      Throws:
        `IOException` - if an input or output error occurs

    - #### mark

          public void mark(int readlimit)

      Marks the current position in this audio input stream.
      Overrides:
        `mark` in class `InputStream`
      Parameters:
        `readlimit` - the maximum number of bytes that can be read before the mark position becomes invalid.
      See Also:
        `reset()`, `markSupported()`

    - #### reset

          public void reset()
                     throws IOException

      Repositions this audio input stream to the position it had at the time its `mark` method was last invoked.
      Overrides:
        `reset` in class `InputStream`
      Throws:
        `IOException` - if an input or output error occurs.
      See Also:
        `mark(int)`, `markSupported()`

    - #### markSupported

          public boolean markSupported()

      Tests whether this audio input stream supports the `mark` and `reset` methods.
      Overrides:
        `markSupported` in class `InputStream`
      Returns:
        `true` if this stream supports the `mark` and `reset` methods; `false` otherwise
      See Also:
        `mark(int)`, `reset()`

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