JavaTM 2 Platform
Std. Ed. v1.4.2

javax.sound.sampled
Class AudioSystem

java.lang.Object
  extended byjavax.sound.sampled.AudioSystem

public class AudioSystem
extends Object

The AudioSystem class acts as the entry point to the sampled-audio system resources. This class lets you query and access the mixers that are installed on the system. AudioSystem includes a number of methods for converting audio data between different formats, and for translating between audio files and streams. It also provides a method for obtaining a Line directly from the AudioSystem without dealing explicitly with mixers.

Since:
1.3
See Also:
AudioFormat, AudioInputStream, Mixer, Line, Line.Info

Field Summary
static int NOT_SPECIFIED
          An integer that stands for an unknown numeric value.
 
Method Summary
static AudioFileFormat getAudioFileFormat(File file)
          Obtains the audio file format of the specified File.
static AudioFileFormat getAudioFileFormat(InputStream stream)
          Obtains the audio file format of the provided input stream.
static AudioFileFormat getAudioFileFormat(URL url)
          Obtains the audio file format of the specified URL.
static AudioFileFormat.Type[] getAudioFileTypes()
          Obtains the file types for which file writing support is provided by the system.
static AudioFileFormat.Type[] getAudioFileTypes(AudioInputStream stream)
          Obtains the file types that the system can write from the audio input stream specified.
static AudioInputStream getAudioInputStream(AudioFormat.Encoding targetEncoding, AudioInputStream sourceStream)
          Obtains an audio input stream of the indicated encoding, by converting the provided audio input stream.
static AudioInputStream getAudioInputStream(AudioFormat targetFormat, AudioInputStream sourceStream)
          Obtains an audio input stream of the indicated format, by converting the provided audio input stream.
static AudioInputStream getAudioInputStream(File file)
          Obtains an audio input stream from the provided File.
static AudioInputStream getAudioInputStream(InputStream stream)
          Obtains an audio input stream from the provided input stream.
static AudioInputStream getAudioInputStream(URL url)
          Obtains an audio input stream from the URL provided.
static Line getLine(Line.Info info)
          Obtains a line that matches the description in the specified Line.Info object.
static Mixer getMixer(Mixer.Info info)
          Obtains the requested audio mixer.
static Mixer.Info[] getMixerInfo()
          Obtains an array of mixer info objects that represents the set of audio mixers that are currently installed on the system.
static Line.Info[] getSourceLineInfo(Line.Info info)
          Obtains information about all source lines of a particular type that are supported by the installed mixers.
static AudioFormat.Encoding[] getTargetEncodings(AudioFormat.Encoding sourceEncoding)
          Obtains the encodings that the system can obtain from an audio input stream with the specified encoding using the set of installed format converters.
static AudioFormat.Encoding[] getTargetEncodings(AudioFormat sourceFormat)
          Obtains the encodings that the system can obtain from an audio input stream with the specified format using the set of installed format converters.
static AudioFormat[] getTargetFormats(AudioFormat.Encoding targetEncoding, AudioFormat sourceFormat)
          Obtains the formats that have a particular encoding and that the system can obtain from a stream of the specified format using the set of installed format converters.
static Line.Info[] getTargetLineInfo(Line.Info info)
          Obtains information about all target lines of a particular type that are supported by the installed mixers.
static boolean isConversionSupported(AudioFormat.Encoding targetEncoding, AudioFormat sourceFormat)
          Indicates whether an audio input stream of the specified encoding can be obtained from an audio input stream that has the specified format.
static boolean isConversionSupported(AudioFormat targetFormat, AudioFormat sourceFormat)
          Indicates whether an audio input stream of a specified format can be obtained from an audio input stream of another specified format.
static boolean isFileTypeSupported(AudioFileFormat.Type fileType)
          Indicates whether file writing support for the specified file type is provided by the system.
static boolean isFileTypeSupported(AudioFileFormat.Type fileType, AudioInputStream stream)
          Indicates whether an audio file of the specified file type can be written from the indicated audio input stream.
static boolean isLineSupported(Line.Info info)
          Indicates whether the system supports any lines that match the specified Line.Info object.
static int write(AudioInputStream stream, AudioFileFormat.Type fileType, File out)
          Writes a stream of bytes representing an audio file of the specified file type to the external file provided.
static int write(AudioInputStream stream, AudioFileFormat.Type fileType, OutputStream out)
          Writes a stream of bytes representing an audio file of the specified file type to the output stream provided.
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Field Detail

NOT_SPECIFIED

public static final int NOT_SPECIFIED
An integer that stands for an unknown numeric value. This value is appropriate only for signed quantities that do not normally take negative values. Examples include file sizes, frame sizes, buffer sizes, and sample rates. A number of Java Sound constructors accept a value of NOT_SPECIFIED for such parameters. Other methods may also accept or return this value, as documented.

See Also:
Constant Field Values
Method Detail

getMixerInfo

public static Mixer.Info[] getMixerInfo()
Obtains an array of mixer info objects that represents the set of audio mixers that are currently installed on the system.

Returns:
an array of info objects for the currently installed mixers. If no mixers are available on the system, an array of length 0 is returned.
See Also:
getMixer(javax.sound.sampled.Mixer.Info)

getMixer

public static Mixer getMixer(Mixer.Info info)
Obtains the requested audio mixer.

Parameters:
info - a Mixer.Info object representing the desired mixer, or null for the system default mixer
Returns:
the requested mixer
Throws:
SecurityException - if the requested mixer is unavailable because of security restrictions
IllegalArgumentException - if the info object does not represent a mixer installed on the system
See Also:
getMixerInfo()

getSourceLineInfo

public static Line.Info[] getSourceLineInfo(Line.Info info)
Obtains information about all source lines of a particular type that are supported by the installed mixers.

Parameters:
info - a Line.Info object that specifies the kind of lines about which information is requested
Returns:
an array of Line.Info objects describing source lines matching the type requested. If no matching source lines are supported, an array of length 0 is returned.
See Also:
Mixer.getSourceLineInfo(Line.Info)

getTargetLineInfo

public static Line.Info[] getTargetLineInfo(Line.Info info)
Obtains information about all target lines of a particular type that are supported by the installed mixers.

Parameters:
info - a Line.Info object that specifies the kind of lines about which information is requested
Returns:
an array of Line.Info objects describing target lines matching the type requested. If no matching target lines are supported, an array of length 0 is returned.
See Also:
Mixer.getTargetLineInfo(Line.Info)

isLineSupported

public static boolean isLineSupported(Line.Info info)
Indicates whether the system supports any lines that match the specified Line.Info object. A line is supported if any installed mixer supports it.

Parameters:
info - a Line.Info object describing the line for which support is queried
Returns:
true if at least one matching line is supported, otherwise false
See Also:
Mixer.isLineSupported(Line.Info)

getLine

public static Line getLine(Line.Info info)
                    throws LineUnavailableException
Obtains a line that matches the description in the specified Line.Info object.

Parameters:
info - a Line.Info object describing the desired kind of line
Returns:
a line of the requested kind
Throws:
LineUnavailableException - if a matching line is not available due to resource restrictions
SecurityException - if a matching line is not available due to security restrictions
IllegalArgumentException - if the system does not support at least one line matching the specified Line.Info object through any installed mixer

getTargetEncodings

public static AudioFormat.Encoding[] getTargetEncodings(AudioFormat.Encoding sourceEncoding)
Obtains the encodings that the system can obtain from an audio input stream with the specified encoding using the set of installed format converters.

Parameters:
sourceEncoding - the encoding for which conversion support is queried
Returns:
array of encodings. If sourceEncodingis not supported, an array of length 0 is returned. Otherwise, the array will have a length of at least 1, representing sourceEncoding (no conversion).

getTargetEncodings

public static AudioFormat.Encoding[] getTargetEncodings(AudioFormat sourceFormat)
Obtains the encodings that the system can obtain from an audio input stream with the specified format using the set of installed format converters.

Parameters:
sourceFormat - the audio format for which conversion is queried
Returns:
array of encodings. If sourceFormatis not supported, an array of length 0 is returned. Otherwise, the array will have a length of at least 1, representing the encoding of sourceFormat (no conversion).

isConversionSupported

public static boolean isConversionSupported(AudioFormat.Encoding targetEncoding,
                                            AudioFormat sourceFormat)
Indicates whether an audio input stream of the specified encoding can be obtained from an audio input stream that has the specified format.

Parameters:
targetEncoding - the desired encoding after conversion
sourceFormat - the audio format before conversion
Returns:
true if the conversion is supported, otherwise false

getAudioInputStream

public static AudioInputStream getAudioInputStream(AudioFormat.Encoding targetEncoding,
                                                   AudioInputStream sourceStream)
Obtains an audio input stream of the indicated encoding, by converting the provided audio input stream.

Parameters:
targetEncoding - the desired encoding after conversion
sourceStream - the stream to be converted
Returns:
an audio input stream of the indicated encoding
Throws:
IllegalArgumentException - if the conversion is not supported
See Also:
getTargetEncodings(AudioFormat.Encoding), getTargetEncodings(AudioFormat), isConversionSupported(AudioFormat.Encoding, AudioFormat), getAudioInputStream(AudioFormat, AudioInputStream)

getTargetFormats

public static AudioFormat[] getTargetFormats(AudioFormat.Encoding targetEncoding,
                                             AudioFormat sourceFormat)
Obtains the formats that have a particular encoding and that the system can obtain from a stream of the specified format using the set of installed format converters.

Parameters:
targetEncoding - the desired encoding after conversion
sourceFormat - the audio format before conversion
Returns:
array of formats. If no formats of the specified encoding are supported, an array of length 0 is returned.

isConversionSupported

public static boolean isConversionSupported(AudioFormat targetFormat,
                                            AudioFormat sourceFormat)
Indicates whether an audio input stream of a specified format can be obtained from an audio input stream of another specified format.

Parameters:
targetFormat - the desired audio format after conversion
sourceFormat - the audio format before conversion
Returns:
true if the conversion is supported, otherwise false

getAudioInputStream

public static AudioInputStream getAudioInputStream(AudioFormat targetFormat,
                                                   AudioInputStream sourceStream)
Obtains an audio input stream of the indicated format, by converting the provided audio input stream.

Parameters:
targetFormat - the desired audio format after conversion
sourceStream - the stream to be converted
Returns:
an audio input stream of the indicated format
Throws:
IllegalArgumentException - if the conversion is not supported #see #getTargetEncodings(AudioFormat)
See Also:
getTargetFormats(AudioFormat.Encoding, AudioFormat), isConversionSupported(AudioFormat, AudioFormat), getAudioInputStream(AudioFormat.Encoding, AudioInputStream)

getAudioFileFormat

public static AudioFileFormat getAudioFileFormat(InputStream stream)
                                          throws UnsupportedAudioFileException,
                                                 IOException
Obtains the audio file format of the provided input stream. The stream must point to valid audio file data. The implementation of this method may require multiple parsers to examine the stream to determine whether they support it. These parsers must be able to mark the stream, read enough data to determine whether they support the stream, and, if not, reset the stream's read pointer to its original position. If the input stream does not support these operations, this method may fail with an IOException.

Parameters:
stream - the input stream from which file format information should be extracted
Returns:
an AudioFileFormat object describing the stream's audio file format
Throws:
UnsupportedAudioFileException - if the stream does not point to valid audio file data recognized by the system
IOException - if an input/output exception occurs
See Also:
InputStream.markSupported(), InputStream.mark(int)

getAudioFileFormat

public static AudioFileFormat getAudioFileFormat(URL url)
                                          throws UnsupportedAudioFileException,
                                                 IOException
Obtains the audio file format of the specified URL. The URL must point to valid audio file data.

Parameters:
url - the URL from which file format information should be extracted
Returns:
an AudioFileFormat object describing the audio file format
Throws:
UnsupportedAudioFileException - if the URL does not point to valid audio file data recognized by the system
IOException - if an input/output exception occurs

getAudioFileFormat

public static AudioFileFormat getAudioFileFormat(File file)
                                          throws UnsupportedAudioFileException,
                                                 IOException
Obtains the audio file format of the specified File. The File must point to valid audio file data.

Parameters:
file - the File from which file format information should be extracted
Returns:
an AudioFileFormat object describing the audio file format
Throws:
UnsupportedAudioFileException - if the File does not point to valid audio file data recognized by the system
IOException - if an I/O exception occurs

getAudioInputStream

public static AudioInputStream getAudioInputStream(InputStream stream)
                                            throws UnsupportedAudioFileException,
                                                   IOException
Obtains an audio input stream from the provided input stream. The stream must point to valid audio file data. The implementation of this method may require multiple parsers to examine the stream to determine whether they support it. These parsers must be able to mark the stream, read enough data to determine whether they support the stream, and, if not, reset the stream's read pointer to its original position. If the input stream does not support these operation, this method may fail with an IOException.

Parameters:
stream - the input stream from which the AudioInputStream should be constructed
Returns:
an AudioInputStream object based on the audio file data contained in the input stream.
Throws:
UnsupportedAudioFileException - if the stream does not point to valid audio file data recognized by the system
IOException - if an I/O exception occurs
See Also:
InputStream.markSupported(), InputStream.mark(int)

getAudioInputStream

public static AudioInputStream getAudioInputStream(URL url)
                                            throws UnsupportedAudioFileException,
                                                   IOException
Obtains an audio input stream from the URL provided. The URL must point to valid audio file data.

Parameters:
url - the URL for which the AudioInputStream should be constructed
Returns:
an AudioInputStream object based on the audio file data pointed to by the URL
Throws:
UnsupportedAudioFileException - if the URL does not point to valid audio file data recognized by the system
IOException - if an I/O exception occurs

getAudioInputStream

public static AudioInputStream getAudioInputStream(File file)
                                            throws UnsupportedAudioFileException,
                                                   IOException
Obtains an audio input stream from the provided File. The File must point to valid audio file data.

Parameters:
file - the File for which the AudioInputStream should be constructed
Returns:
an AudioInputStream object based on the audio file data pointed to by the File
Throws:
UnsupportedAudioFileException - if the File does not point to valid audio file data recognized by the system
IOException - if an I/O exception occurs

getAudioFileTypes

public static AudioFileFormat.Type[] getAudioFileTypes()
Obtains the file types for which file writing support is provided by the system.

Returns:
array of file types. If no file types are supported, an array of length 0 is returned.

isFileTypeSupported

public static boolean isFileTypeSupported(AudioFileFormat.Type fileType)
Indicates whether file writing support for the specified file type is provided by the system.

Parameters:
fileType - the file type for which write capabilities are queried
Returns:
true if the file type is supported, otherwise false

getAudioFileTypes

public static AudioFileFormat.Type[] getAudioFileTypes(AudioInputStream stream)
Obtains the file types that the system can write from the audio input stream specified.

Parameters:
stream - the audio input stream for which audio file type support is queried
Returns:
array of file types. If no file types are supported, an array of length 0 is returned.

isFileTypeSupported

public static boolean isFileTypeSupported(AudioFileFormat.Type fileType,
                                          AudioInputStream stream)
Indicates whether an audio file of the specified file type can be written from the indicated audio input stream.

Parameters:
fileType - the file type for which write capabilities are queried
stream - the stream for which file-writing support is queried
Returns:
true if the file type is supported for this audio input stream, otherwise false

write

public static int write(AudioInputStream stream,
                        AudioFileFormat.Type fileType,
                        OutputStream out)
                 throws IOException
Writes a stream of bytes representing an audio file of the specified file type to the output stream provided. Some file types require that the length be written into the file header; such files cannot be written from start to finish unless the length is known in advance. An attempt to write a file of such a type will fail with an IOException if the length in the audio file type is AudioSystem.NOT_SPECIFIED.

Parameters:
stream - the audio input stream containing audio data to be written to the file
fileType - the kind of audio file to write
out - the stream to which the file data should be written
Returns:
the number of bytes written to the output stream
Throws:
IOException - if an input/output exception occurs
IllegalArgumentException - if the file type is not supported by the system
See Also:
isFileTypeSupported(javax.sound.sampled.AudioFileFormat.Type), getAudioFileTypes()

write

public static int write(AudioInputStream stream,
                        AudioFileFormat.Type fileType,
                        File out)
                 throws IOException
Writes a stream of bytes representing an audio file of the specified file type to the external file provided.

Parameters:
stream - the audio input stream containing audio data to be written to the file
fileType - the kind of audio file to write
out - the external file to which the file data should be written
Returns:
the number of bytes written to the file
Throws:
IOException - if an I/O exception occurs
IllegalArgumentException - if the file type is not supported by the system
See Also:
isFileTypeSupported(javax.sound.sampled.AudioFileFormat.Type), getAudioFileTypes()

JavaTM 2 Platform
Std. Ed. v1.4.2

Submit a bug or feature
For further API reference and developer documentation, see Java 2 SDK SE Developer Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.

Copyright 2003 Sun Microsystems, Inc. All rights reserved. Use is subject to license terms. Also see the documentation redistribution policy.


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