Mixer JDK 1.6)

Description

public interface Mixer

A mixer is an audio device with one or more lines.

A mixer is an audio device with one or more lines. It need not be designed for mixing audio signals. A mixer that actually mixes audio has multiple input (source) lines and at least one output (target) line. The former are often instances of classes that implement SourceDataLine, and the latter, TargetDataLine. Port objects, too, are either source lines or target lines. A mixer can accept prerecorded, loopable sound as input, by having some of its source lines be instances of objects that implement the Clip interface.

Through methods of the Line interface, which Mixer extends, a mixer might provide a set of controls that are global to the mixer. For example, the mixer can have a master gain control. These global controls are distinct from the controls belonging to each of the mixer's individual lines.

Some mixers, especially those with internal digital mixing capabilities, may provide additional capabilities by implementing the DataLine interface.

A mixer can support synchronization of its lines. When one line in a synchronized group is started or stopped, the other lines in the group automatically start or stop simultaneously with the explicitly affected one.

See also:

Methods

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public Line getLine (Info info) throws LineUnavailableException

Obtains a line that is available for use and that matches the description in the specified Line.Info object.

If a DataLine is requested, and info is an instance of DataLine.Info specifying at least one fully qualified audio format, the last one will be used as the default format of the returned DataLine.
Parameters:
- info - describes the desired line
Throws:
- LineUnavailableException - if a matching line is not available due to resource restrictions
- IllegalArgumentException - if this mixer does not support any lines matching the description
- SecurityException - if a matching line is not available due to security restrictions

public int getMaxLines (Info info)

Obtains the approximate maximum number of lines of the requested type that can be open simultaneously on the mixer.

Obtains the approximate maximum number of lines of the requested type that can be open
simultaneously on the mixer.

Certain types of mixers do not have a hard bound and may allow opening more lines.
Since certain lines are a shared resource, a mixer may not be able to open the maximum
number of lines if another process has opened lines of this mixer.

The requested type is any line that matches the description in
the provided Line.Info object. For example, if the info
object represents a speaker
port, and the mixer supports exactly one speaker port, this method
should return 1. If the info object represents a source data line
and the mixer supports the use of 32 source data lines simultaneously,
the return value should be 32.
If there is no limit, this function returns AudioSystem.NOT_SPECIFIED.
Returns: the maximum number of matching lines supported, or AudioSystem.NOT_SPECIFIED
Parameters:
- info - a Line.Info that describes the line for which the number of supported instances is queried

public Info getMixerInfo ()

Obtains information about this mixer, including the product's name, version, vendor, etc.

public Info getSourceLineInfo ()

Obtains information about the set of source lines supported by this mixer.

Obtains information about the set of source lines supported
by this mixer.
Some source lines may only be available when this mixer is open.
Returns: array of Line.Info objects representing source lines for this mixer. If no source lines are supported, an array of length 0 is returned.

public Info getSourceLineInfo (Info info)

Obtains information about source lines of a particular type supported by the mixer.

Obtains information about source lines of a particular type supported
by the mixer.
Some source lines may only be available when this mixer is open.
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.
Parameters:
- info - a Line.Info object describing lines about which information is queried

public Line getSourceLines ()

Obtains the set of all source lines currently open to this mixer.

public Info getTargetLineInfo ()

Obtains information about the set of target lines supported by this mixer.

Obtains information about the set of target lines supported
by this mixer.
Some target lines may only be available when this mixer is open.
Returns: array of Line.Info objects representing target lines for this mixer. If no target lines are supported, an array of length 0 is returned.

public Info getTargetLineInfo (Info info)

Obtains information about target lines of a particular type supported by the mixer.

Obtains information about target lines of a particular type supported
by the mixer.
Some target lines may only be available when this mixer is open.
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.
Parameters:
- info - a Line.Info object describing lines about which information is queried

public Line getTargetLines ()

Obtains the set of all target lines currently open from this mixer.

public boolean isLineSupported (Info info)

Indicates whether the mixer supports a line (or lines) that match the specified Line.Info object.

Indicates whether the mixer supports a line (or lines) that match
the specified Line.Info object.
Some lines may only be supported when this mixer is open.
Returns: true if at least one matching line is supported, false otherwise
Parameters:
- info - describes the line for which support is queried

public boolean isSynchronizationSupported (Line lines, boolean maintainSync)

Reports whether this mixer supports synchronization of the specified set of lines.

Reports whether this mixer supports synchronization of the specified set of lines.
Returns: true if the lines can be synchronized, false otherwise
Parameters:
- lines - the set of lines for which synchronization support is queried
- maintainSync - true if the synchronization must be precisely maintained (i.e., the synchronization must be sample-accurate) at all times during operation of the lines , or false if precise synchronization is required only during start and stop operations

public void synchronize (Line lines, boolean maintainSync)

Synchronizes two or more lines.

Synchronizes two or more lines. Any subsequent command that starts or stops
audio playback or capture for one of these lines will exert the
same effect on the other lines in the group, so that they start or stop playing or
capturing data simultaneously.
Parameters:
- lines - the lines that should be synchronized
- maintainSync - true if the synchronization must be precisely maintained (i.e., the synchronization must be sample-accurate) at all times during operation of the lines , or false if precise synchronization is required only during start and stop operations
Throws:
- IllegalArgumentException - if the lines cannot be synchronized. This may occur if the lines are of different types or have different formats for which this mixer does not support synchronization, or if all lines specified do not belong to this mixer.

public void unsynchronize (Line lines)

Releases synchronization for the specified lines.

Releases synchronization for the specified lines. The array must
be identical to one for which synchronization has already been
established; otherwise an exception may be thrown. However, null
may be specified, in which case all currently synchronized lines that belong
to this mixer are unsynchronized.
Parameters:
- lines - the synchronized lines for which synchronization should be released, or null for all this mixer's synchronized lines
Throws:
- IllegalArgumentException - if the lines cannot be unsynchronized. This may occur if the argument specified does not exactly match a set of lines for which synchronization has already been established.