Interface Clip

public interface Clip
extends DataLine

The Clip interface represents a special kind of data line whose audio data can be loaded prior to playback, instead of being streamed in real time.

Because the data is pre-loaded and has a known length, you can set a clip to start playing at any position in its audio data. You can also create a loop, so that when the clip is played it will cycle repeatedly. Loops are specified with a starting and ending sample frame, along with the number of times that the loop should be played.

Clips may be obtained from a Mixer that supports lines of this type. Data is loaded into a clip when it is opened.

Playback of an audio clip may be started and stopped using the start and stop methods. These methods do not reset the media position; start causes playback to continue from the position where playback was last stopped. To restart playback from the beginning of the clip's audio data, simply follow the invocation of stop with setFramePosition(0), which rewinds the media to the beginning of the clip.

Fields

LOOP_CONTINUOUSLY

static final int LOOP_CONTINUOUSLY

A value indicating that looping should continue indefinitely rather than complete after a specific number of loops.

See Also:

loop(int), Constant Field Values

Methods

open

void open(AudioFormat format,
          byte[] data,
          int offset,
          int bufferSize)
   throws LineUnavailableException

Parameters:

format - the format of the supplied audio data

data - a byte array containing audio data to load into the clip

offset - the point at which to start copying, expressed in bytes from the beginning of the array

bufferSize - the number of bytes of data to load into the clip from the array.

Throws:

LineUnavailableException - if the line cannot be opened due to resource restrictions

IllegalArgumentException - if the buffer size does not represent an integral number of sample frames, or if format is not fully specified or invalid

IllegalStateException - if the line is already open

SecurityException - if the line cannot be opened due to security restrictions

See Also:

Line.close(), Line.isOpen(), LineListener

open

void open(AudioInputStream stream)
   throws LineUnavailableException,
          IOException

Parameters:

stream - an audio input stream from which audio data will be read into the clip

Throws:

LineUnavailableException - if the line cannot be opened due to resource restrictions

IOException - if an I/O exception occurs during reading of the stream

IllegalArgumentException - if the stream's audio format is not fully specified or invalid

IllegalStateException - if the line is already open

SecurityException - if the line cannot be opened due to security restrictions

See Also:

Line.close(), Line.isOpen(), LineListener

getFrameLength

int getFrameLength()

Obtains the media length in sample frames.

Returns:

the media length, expressed in sample frames, or AudioSystem.NOT_SPECIFIED if the line is not open.

See Also:

AudioSystem.NOT_SPECIFIED

getMicrosecondLength

long getMicrosecondLength()

Obtains the media duration in microseconds

Returns:

the media duration, expressed in microseconds, or AudioSystem.NOT_SPECIFIED if the line is not open.

See Also:

AudioSystem.NOT_SPECIFIED

setFramePosition

void setFramePosition(int frames)

Parameters:

frames - the desired new media position, expressed in sample frames

setMicrosecondPosition

void setMicrosecondPosition(long microseconds)

Parameters:

microseconds - the desired new media position, expressed in microseconds

setLoopPoints

void setLoopPoints(int start,
                   int end)

Sets the first and last sample frames that will be played in the loop. The ending point must be greater than or equal to the starting point, and both must fall within the the size of the loaded media. A value of 0 for the starting point means the beginning of the loaded media. Similarly, a value of -1 for the ending point indicates the last frame of the media.

Parameters:

start - the loop's starting position, in sample frames (zero-based)

end - the loop's ending position, in sample frames (zero-based), or -1 to indicate the final frame

Throws:

IllegalArgumentException - if the requested loop points cannot be set, usually because one or both falls outside the media's duration or because the ending point is before the starting point

loop

void loop(int count)

Parameters:

count - the number of times playback should loop back from the loop's end position to the loop's start position, or LOOP_CONTINUOUSLY to indicate that looping should continue until interrupted