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 and 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.

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Constructor Summary

Constructors
Constructor and 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.

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Method Summary

Methods
Modifier and Type	Method and 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.

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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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Dokument erstellt 11/06/2005, zuletzt geändert 04/03/2020
Quelle des gedruckten Dokuments:https://www.gaudry.be/de/java-api-rf-javax/sound/sampled/audioinputstream.html

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Class AudioInputStream

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