The Mixer.java Java example source code
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package javax.sound.sampled;
/**
* 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
* <code>{@link SourceDataLine},
* and the latter, <code>{@link TargetDataLine}. {@link 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
* <code>{@link Clip} interface.
* <p>
* Through methods of the <code>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.
* <p>
* Some mixers, especially
* those with internal digital mixing capabilities, may provide
* additional capabilities by implementing the <code>DataLine interface.
* <p>
* 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.
*
* @author Kara Kytle
* @since 1.3
*/
public interface Mixer extends Line {
/**
* Obtains information about this mixer, including the product's name,
* version, vendor, etc.
* @return a mixer info object that describes this mixer
* @see Mixer.Info
*/
public Info getMixerInfo();
/**
* Obtains information about the set of source lines supported
* by this mixer.
* Some source lines may only be available when this mixer is open.
* @return array of <code>Line.Info objects representing source lines
* for this mixer. If no source lines are supported,
* an array of length 0 is returned.
*/
public Line.Info[] getSourceLineInfo();
/**
* Obtains information about the set of target lines supported
* by this mixer.
* Some target lines may only be available when this mixer is open.
* @return array of <code>Line.Info objects representing target lines
* for this mixer. If no target lines are supported,
* an array of length 0 is returned.
*/
public Line.Info[] getTargetLineInfo();
/**
* 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.
* @param info a <code>Line.Info object describing lines about which information
* is queried
* @return an array of <code>Line.Info objects describing source lines matching
* the type requested. If no matching source lines are supported, an array of length 0
* is returned.
*/
public Line.Info[] getSourceLineInfo(Line.Info info);
/**
* 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.
* @param info a <code>Line.Info object describing lines about which information
* is queried
* @return an array of <code>Line.Info objects describing target lines matching
* the type requested. If no matching target lines are supported, an array of length 0
* is returned.
*/
public Line.Info[] getTargetLineInfo(Line.Info info);
/**
* Indicates whether the mixer supports a line (or lines) that match
* the specified <code>Line.Info object.
* Some lines may only be supported when this mixer is open.
* @param info describes the line for which support is queried
* @return <code>true if at least one matching line is
* supported, <code>false otherwise
*/
public boolean isLineSupported(Line.Info info);
/**
* Obtains a line that is available for use and that matches the description
* in the specified <code>Line.Info object.
*
* <p>If a DataLine is requested, and info
* is an instance of <code>DataLine.Info specifying at
* least one fully qualified audio format, the last one
* will be used as the default format of the returned
* <code>DataLine.
*
* @param info describes the desired line
* @return a line that is available for use and that matches the description
* in the specified {@code Line.Info} object
* @throws LineUnavailableException if a matching line
* is not available due to resource restrictions
* @throws IllegalArgumentException if this mixer does
* not support any lines matching the description
* @throws SecurityException if a matching line
* is not available due to security restrictions
*/
public Line getLine(Line.Info info) throws LineUnavailableException;
//$$fb 2002-04-12: fix for 4667258: behavior of Mixer.getMaxLines(Line.Info) method doesn't match the spec
/**
* 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 <code>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 <code>AudioSystem.NOT_SPECIFIED.
* @param info a <code>Line.Info that describes the line for which
* the number of supported instances is queried
* @return the maximum number of matching lines supported, or <code>AudioSystem.NOT_SPECIFIED
*/
public int getMaxLines(Line.Info info);
/**
* Obtains the set of all source lines currently open to this mixer.
*
* @return the source lines currently open to the mixer.
* If no source lines are currently open to this mixer, an
* array of length 0 is returned.
* @throws SecurityException if the matching lines
* are not available due to security restrictions
*/
public Line[] getSourceLines();
/**
* Obtains the set of all target lines currently open from this mixer.
*
* @return target lines currently open from the mixer.
* If no target lines are currently open from this mixer, an
* array of length 0 is returned.
* @throws SecurityException if the matching lines
* are not available due to security restrictions
*/
public Line[] getTargetLines();
/**
* 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.
*
* @param lines the lines that should be synchronized
* @param maintainSync <code>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 <code>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 synchronize(Line[] lines, boolean maintainSync);
/**
* 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, <code>null
* may be specified, in which case all currently synchronized lines that belong
* to this mixer are unsynchronized.
* @param lines the synchronized lines for which synchronization should be
* released, or <code>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.
*/
public void unsynchronize(Line[] lines);
/**
* Reports whether this mixer supports synchronization of the specified set of lines.
*
* @param lines the set of lines for which synchronization support is queried
* @param maintainSync <code>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 <code>false
* if precise synchronization is required only during start and stop operations
*
* @return <code>true if the lines can be synchronized, false
* otherwise
*/
public boolean isSynchronizationSupported(Line[] lines, boolean maintainSync);
/**
* The <code>Mixer.Info class represents information about an audio mixer,
* including the product's name, version, and vendor, along with a textual
* description. This information may be retrieved through the
* {@link Mixer#getMixerInfo() getMixerInfo}
* method of the <code>Mixer interface.
*
* @author Kara Kytle
* @since 1.3
*/
public static class Info {
/**
* Mixer name.
*/
private final String name;
/**
* Mixer vendor.
*/
private final String vendor;
/**
* Mixer description.
*/
private final String description;
/**
* Mixer version.
*/
private final String version;
/**
* Constructs a mixer's info object, passing it the given
* textual information.
* @param name the name of the mixer
* @param vendor the company who manufactures or creates the hardware
* or software mixer
* @param description descriptive text about the mixer
* @param version version information for the mixer
*/
protected Info(String name, String vendor, String description, String version) {
this.name = name;
this.vendor = vendor;
this.description = description;
this.version = version;
}
/**
* Indicates whether two info objects are equal, returning <code>true if
* they are identical.
* @param obj the reference object with which to compare this info
* object
* @return <code>true if this info object is the same as the
* <code>obj argument; false otherwise
*/
public final boolean equals(Object obj) {
return super.equals(obj);
}
/**
* Finalizes the hashcode method.
*
* @return the hashcode for this object
*/
public final int hashCode() {
return super.hashCode();
}
/**
* Obtains the name of the mixer.
* @return a string that names the mixer
*/
public final String getName() {
return name;
}
/**
* Obtains the vendor of the mixer.
* @return a string that names the mixer's vendor
*/
public final String getVendor() {
return vendor;
}
/**
* Obtains the description of the mixer.
* @return a textual description of the mixer
*/
public final String getDescription() {
return description;
}
/**
* Obtains the version of the mixer.
* @return textual version information for the mixer
*/
public final String getVersion() {
return version;
}
/**
* Provides a string representation of the mixer info.
* @return a string describing the info object
*/
public final String toString() {
return (name + ", version " + version);
}
} // class Info
}
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