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package javax.sound.sampled;
Ports are simple lines for input or output of audio to or from audio devices.
Common examples of ports that act as source lines (mixer inputs) include the microphone,
line input, and CD-ROM drive. Ports that act as target lines (mixer outputs) include the
speaker, headphone, and line output. You can access port using a InfoAuthor: Kara Kytle Since: 1.3
/**
* Ports are simple lines for input or output of audio to or from audio devices.
* Common examples of ports that act as source lines (mixer inputs) include the microphone,
* line input, and CD-ROM drive. Ports that act as target lines (mixer outputs) include the
* speaker, headphone, and line output. You can access port using a <code>{@link Port.Info}</code>
* object.
*
* @author Kara Kytle
* @since 1.3
*/
public interface Port extends Line {
// INNER CLASSES
The Port.Info class extends Info
To learn what ports are available, you can retrieve port info objects through the
getSourceLineInfogetTargetLineInfoMixer interface. Instances of the
Port.Info class may also be constructed and used to obtain
lines matching the parameters specified in the Port.Info object.
Author: Kara Kytle Since: 1.3
/**
* The <code>Port.Info</code> class extends <code>{@link Line.Info}</code>
* with additional information specific to ports, including the port's name
* and whether it is a source or a target for its mixer.
* By definition, a port acts as either a source or a target to its mixer,
* but not both. (Audio input ports are sources; audio output ports are targets.)
* <p>
* To learn what ports are available, you can retrieve port info objects through the
* <code>{@link Mixer#getSourceLineInfo getSourceLineInfo}</code> and
* <code>{@link Mixer#getTargetLineInfo getTargetLineInfo}</code>
* methods of the <code>Mixer</code> interface. Instances of the
* <code>Port.Info</code> class may also be constructed and used to obtain
* lines matching the parameters specified in the <code>Port.Info</code> object.
*
* @author Kara Kytle
* @since 1.3
*/
public static class Info extends Line.Info {
// AUDIO PORT TYPE DEFINES
// SOURCE PORTS
A type of port that gets audio from a built-in microphone or a microphone jack.
/**
* A type of port that gets audio from a built-in microphone or a microphone jack.
*/
public static final Info MICROPHONE = new Info(Port.class,"MICROPHONE", true);
A type of port that gets audio from a line-level audio input jack.
/**
* A type of port that gets audio from a line-level audio input jack.
*/
public static final Info LINE_IN = new Info(Port.class,"LINE_IN", true);
A type of port that gets audio from a CD-ROM drive.
/**
* A type of port that gets audio from a CD-ROM drive.
*/
public static final Info COMPACT_DISC = new Info(Port.class,"COMPACT_DISC", true);
// TARGET PORTS
A type of port that sends audio to a built-in speaker or a speaker jack.
/**
* A type of port that sends audio to a built-in speaker or a speaker jack.
*/
public static final Info SPEAKER = new Info(Port.class,"SPEAKER", false);
A type of port that sends audio to a headphone jack.
/**
* A type of port that sends audio to a headphone jack.
*/
public static final Info HEADPHONE = new Info(Port.class,"HEADPHONE", false);
A type of port that sends audio to a line-level audio output jack.
/**
* A type of port that sends audio to a line-level audio output jack.
*/
public static final Info LINE_OUT = new Info(Port.class,"LINE_OUT", false);
// FUTURE DIRECTIONS...
// telephone
// DAT
// DVD
// INSTANCE VARIABLES
private String name;
private boolean isSource;
// CONSTRUCTOR
Constructs a port's info object from the information given.
This constructor is typically used by an implementation
of Java Sound to describe a supported line.
Params: - lineClass – the class of the port described by the info object.
- name – the string that names the port
- isSource –
true if the port is a source port (such
as a microphone), false if the port is a target port
(such as a speaker).
/**
* Constructs a port's info object from the information given.
* This constructor is typically used by an implementation
* of Java Sound to describe a supported line.
*
* @param lineClass the class of the port described by the info object.
* @param name the string that names the port
* @param isSource <code>true</code> if the port is a source port (such
* as a microphone), <code>false</code> if the port is a target port
* (such as a speaker).
*/
public Info(Class<?> lineClass, String name, boolean isSource) {
super(lineClass);
this.name = name;
this.isSource = isSource;
}
// METHODS
Obtains the name of the port.
Returns: the string that names the port
/**
* Obtains the name of the port.
* @return the string that names the port
*/
public String getName() {
return name;
}
Indicates whether the port is a source or a target for its mixer.
Returns: true if the port is a source port (such
as a microphone), false if the port is a target port
(such as a speaker).
/**
* Indicates whether the port is a source or a target for its mixer.
* @return <code>true</code> if the port is a source port (such
* as a microphone), <code>false</code> if the port is a target port
* (such as a speaker).
*/
public boolean isSource() {
return isSource;
}
Indicates whether this info object specified matches this one.
To match, the match requirements of the superclass must be
met and the types must be equal.
Params: - info – the info object for which the match is queried
/**
* Indicates whether this info object specified matches this one.
* To match, the match requirements of the superclass must be
* met and the types must be equal.
* @param info the info object for which the match is queried
*/
public boolean matches(Line.Info info) {
if (! (super.matches(info)) ) {
return false;
}
if (!(name.equals(((Info)info).getName())) ) {
return false;
}
if (! (isSource == ((Info)info).isSource()) ) {
return false;
}
return true;
}
Finalizes the equals method
/**
* Finalizes the equals method
*/
public final boolean equals(Object obj) {
return super.equals(obj);
}
Finalizes the hashCode method
/**
* Finalizes the hashCode method
*/
public final int hashCode() {
return super.hashCode();
}
Provides a String representation
of the port.
Returns: a string that describes the port
/**
* Provides a <code>String</code> representation
* of the port.
* @return a string that describes the port
*/
public final String toString() {
return (name + ((isSource == true) ? " source" : " target") + " port");
}
} // class Info
}