API java : DataLine.Info

javax.sound.sampled
Class DataLine.Info

java.lang.Object
  javax.sound.sampled.Line.Info
      javax.sound.sampled.DataLine.Info

Enclosing interface:

DataLine

public static class DataLine.Info
extends Line.Info

Besides the class information inherited from its superclass, DataLine.Info provides additional information specific to data lines. This information includes:

• the audio formats supported by the data line
• the minimum and maximum sizes of its internal buffer

Because a Line.Info knows the class of the line its describes, a DataLine.Info object can describe DataLine subinterfaces such as SourceDataLine, TargetDataLine, and Clip. You can query a mixer for lines of any of these types, passing an appropriate instance of DataLine.Info as the argument to a method such as Mixer.getLine(Line.Info).

Since:

1.3

See Also:

Line.Info

Constructor Summary
DataLine.Info(Class<?> lineClass, AudioFormat format)           Constructs a data line's info object from the specified information, which includes a single audio format.
DataLine.Info(Class<?> lineClass, AudioFormat[] formats, int minBufferSize, int maxBufferSize)           Constructs a data line's info object from the specified information, which includes a set of supported audio formats and a range for the buffer size.
DataLine.Info(Class<?> lineClass, AudioFormat format, int bufferSize)           Constructs a data line's info object from the specified information, which includes a single audio format and a desired buffer size.

 

Method Summary
AudioFormat[]	getFormats()           Obtains a set of audio formats supported by the data line.
int	getMaxBufferSize()           Obtains the maximum buffer size supported by the data line.
int	getMinBufferSize()           Obtains the minimum buffer size supported by the data line.
boolean	isFormatSupported(AudioFormat format)           Indicates whether this data line supports a particular audio format.
boolean	matches(Line.Info info)           Determines whether the specified info object matches this one.
String	toString()           Obtains a textual description of the data line info.

 

Methods inherited from class javax.sound.sampled.Line.Info
getLineClass

 

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

 

Constructor Detail

DataLine.Info

public DataLine.Info(Class<?> lineClass,
                     AudioFormat[] formats,
                     int minBufferSize,
                     int maxBufferSize)

Constructs a data line's info object from the specified information, which includes a set of supported audio formats and a range for the buffer size. This constructor is typically used by mixer implementations when returning information about a supported line.

Parameters:

lineClass - the class of the data line described by the info object

formats - set of formats supported

minBufferSize - minimum buffer size supported by the data line, in bytes

maxBufferSize - maximum buffer size supported by the data line, in bytes

DataLine.Info

public DataLine.Info(Class<?> lineClass,
                     AudioFormat format,
                     int bufferSize)

Constructs a data line's info object from the specified information, which includes a single audio format and a desired buffer size. This constructor is typically used by an application to describe a desired line.

Parameters:

lineClass - the class of the data line described by the info object

format - desired format

bufferSize - desired buffer size in bytes

DataLine.Info

public DataLine.Info(Class<?> lineClass,
                     AudioFormat format)

Constructs a data line's info object from the specified information, which includes a single audio format. This constructor is typically used by an application to describe a desired line.

Parameters:

lineClass - the class of the data line described by the info object

format - desired format

Method Detail

getFormats

public AudioFormat[] getFormats()

Obtains a set of audio formats supported by the data line. Note that isFormatSupported(AudioFormat) might return true for certain additional formats that are missing from the set returned by getFormats(). The reverse is not the case: isFormatSupported(AudioFormat) is guaranteed to return true for all formats returned by getFormats(). Some fields in the AudioFormat instances can be set to NOT_SPECIFIED if that field does not apply to the format, or if the format supports a wide range of values for that field. For example, a multi-channel device supporting up to 64 channels, could set the channel field in the AudioFormat instances returned by this method to NOT_SPECIFIED.

Returns:

a set of supported audio formats.

See Also:

isFormatSupported(AudioFormat)

isFormatSupported

public boolean isFormatSupported(AudioFormat format)

Indicates whether this data line supports a particular audio format. The default implementation of this method simply returns true if the specified format matches any of the supported formats.

Parameters:

format - the audio format for which support is queried.

Returns:

true if the format is supported, otherwise false

See Also:

getFormats(), AudioFormat.matches(javax.sound.sampled.AudioFormat)

getMinBufferSize

public int getMinBufferSize()

Obtains the minimum buffer size supported by the data line.

Returns:

minimum buffer size in bytes, or AudioSystem.NOT_SPECIFIED

getMaxBufferSize

public int getMaxBufferSize()

Obtains the maximum buffer size supported by the data line.

Returns:

maximum buffer size in bytes, or AudioSystem.NOT_SPECIFIED

matches

public boolean matches(Line.Info info)

Determines whether the specified info object matches this one. To match, the superclass match requirements must be met. In addition, this object's minimum buffer size must be at least as large as that of the object specified, its maximum buffer size must be at most as large as that of the object specified, and all of its formats must match formats supported by the object specified.

Overrides:

matches in class Line.Info

Parameters:

info - the info object which is being compared to this one

Returns:

true if this object matches the one specified, otherwise false.

toString

public String toString()

Obtains a textual description of the data line info.

Overrides:

toString in class Line.Info

Returns:

a string description

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