javax.sound.sampled
Interface SourceDataLine

All Superinterfaces:
DataLine sample code for javax.sound.sampled.DataLine definition code for javax.sound.sampled.DataLine , Line sample code for javax.sound.sampled.Line definition code for javax.sound.sampled.Line

public interface SourceDataLine
extends DataLine sample code for javax.sound.sampled.DataLine definition code for javax.sound.sampled.DataLine

A source data line is a data line to which data may be written. It acts as a source to its mixer. An application writes audio bytes to a source data line, which handles the buffering of the bytes and delivers them to the mixer. The mixer may mix the samples with those from other sources and then deliver the mix to a target such as an output port (which may represent an audio output device on a sound card).

Note that the naming convention for this interface reflects the relationship between the line and its mixer. From the perspective of an application, a source data line may act as a target for audio data.

A source data line can be obtained from a mixer by invoking the getLine sample code for javax.sound.sampled.Mixer.getLine(javax.sound.sampled.Line.Info) definition code for javax.sound.sampled.Mixer.getLine(javax.sound.sampled.Line.Info) method of Mixer with an appropriate DataLine.Info sample code for javax.sound.sampled.DataLine.Info definition code for javax.sound.sampled.DataLine.Info object.

The SourceDataLine interface provides a method for writing audio data to the data line's buffer. Applications that play or mix audio should write data to the source data line quickly enough to keep the buffer from underflowing (emptying), which could cause discontinuities in the audio that are perceived as clicks. Applications can use the available sample code for javax.sound.sampled.DataLine.available() definition code for javax.sound.sampled.DataLine.available() method defined in the DataLine interface to determine the amount of data currently queued in the data line's buffer. The amount of data which can be written to the buffer without blocking is the difference between the buffer size and the amount of queued data. If the delivery of audio output stops due to underflow, a STOP sample code for javax.sound.sampled.LineEvent.Type.STOP definition code for javax.sound.sampled.LineEvent.Type.STOP event is generated. A START sample code for javax.sound.sampled.LineEvent.Type.START definition code for javax.sound.sampled.LineEvent.Type.START event is generated when the audio output resumes.

Since:
1.3
See Also:
Mixer sample code for javax.sound.sampled.Mixer definition code for javax.sound.sampled.Mixer , DataLine sample code for javax.sound.sampled.DataLine definition code for javax.sound.sampled.DataLine , TargetDataLine sample code for javax.sound.sampled.TargetDataLine definition code for javax.sound.sampled.TargetDataLine

Nested Class Summary
 
Nested classes/interfaces inherited from interface javax.sound.sampled.DataLine sample code for javax.sound.sampled.DataLine definition code for javax.sound.sampled.DataLine
DataLine.Info sample code for javax.sound.sampled.DataLine.Info definition code for javax.sound.sampled.DataLine.Info
 
Method Summary
 void open sample code for javax.sound.sampled.SourceDataLine.open(javax.sound.sampled.AudioFormat) definition code for javax.sound.sampled.SourceDataLine.open(javax.sound.sampled.AudioFormat) (AudioFormat sample code for javax.sound.sampled.AudioFormat definition code for javax.sound.sampled.AudioFormat  format)
          Opens the line with the specified format, causing the line to acquire any required system resources and become operational.
 void open sample code for javax.sound.sampled.SourceDataLine.open(javax.sound.sampled.AudioFormat, int) definition code for javax.sound.sampled.SourceDataLine.open(javax.sound.sampled.AudioFormat, int) (AudioFormat sample code for javax.sound.sampled.AudioFormat definition code for javax.sound.sampled.AudioFormat  format, int bufferSize)
          Opens the line with the specified format and suggested buffer size, causing the line to acquire any required system resources and become operational.
 int write sample code for javax.sound.sampled.SourceDataLine.write(byte[], int, int) definition code for javax.sound.sampled.SourceDataLine.write(byte[], int, int) (byte[] b, int off, int len)
          Writes audio data to the mixer via this source data line.
 
Methods inherited from interface javax.sound.sampled.DataLine sample code for javax.sound.sampled.DataLine definition code for javax.sound.sampled.DataLine
available sample code for javax.sound.sampled.DataLine.available() definition code for javax.sound.sampled.DataLine.available() , drain sample code for javax.sound.sampled.DataLine.drain() definition code for javax.sound.sampled.DataLine.drain() , flush sample code for javax.sound.sampled.DataLine.flush() definition code for javax.sound.sampled.DataLine.flush() , getBufferSize sample code for javax.sound.sampled.DataLine.getBufferSize() definition code for javax.sound.sampled.DataLine.getBufferSize() , getFormat sample code for javax.sound.sampled.DataLine.getFormat() definition code for javax.sound.sampled.DataLine.getFormat() , getFramePosition sample code for javax.sound.sampled.DataLine.getFramePosition() definition code for javax.sound.sampled.DataLine.getFramePosition() , getLevel sample code for javax.sound.sampled.DataLine.getLevel() definition code for javax.sound.sampled.DataLine.getLevel() , getLongFramePosition sample code for javax.sound.sampled.DataLine.getLongFramePosition() definition code for javax.sound.sampled.DataLine.getLongFramePosition() , getMicrosecondPosition sample code for javax.sound.sampled.DataLine.getMicrosecondPosition() definition code for javax.sound.sampled.DataLine.getMicrosecondPosition() , isActive sample code for javax.sound.sampled.DataLine.isActive() definition code for javax.sound.sampled.DataLine.isActive() , isRunning sample code for javax.sound.sampled.DataLine.isRunning() definition code for javax.sound.sampled.DataLine.isRunning() , start sample code for javax.sound.sampled.DataLine.start() definition code for javax.sound.sampled.DataLine.start() , stop sample code for javax.sound.sampled.DataLine.stop() definition code for javax.sound.sampled.DataLine.stop()
 
Methods inherited from interface javax.sound.sampled.Line sample code for javax.sound.sampled.Line definition code for javax.sound.sampled.Line
addLineListener sample code for javax.sound.sampled.Line.addLineListener(javax.sound.sampled.LineListener) definition code for javax.sound.sampled.Line.addLineListener(javax.sound.sampled.LineListener) , close sample code for javax.sound.sampled.Line.close() definition code for javax.sound.sampled.Line.close() , getControl sample code for javax.sound.sampled.Line.getControl(javax.sound.sampled.Control.Type) definition code for javax.sound.sampled.Line.getControl(javax.sound.sampled.Control.Type) , getControls sample code for javax.sound.sampled.Line.getControls() definition code for javax.sound.sampled.Line.getControls() , getLineInfo sample code for javax.sound.sampled.Line.getLineInfo() definition code for javax.sound.sampled.Line.getLineInfo() , isControlSupported sample code for javax.sound.sampled.Line.isControlSupported(javax.sound.sampled.Control.Type) definition code for javax.sound.sampled.Line.isControlSupported(javax.sound.sampled.Control.Type) , isOpen sample code for javax.sound.sampled.Line.isOpen() definition code for javax.sound.sampled.Line.isOpen() , open sample code for javax.sound.sampled.Line.open() definition code for javax.sound.sampled.Line.open() , removeLineListener sample code for javax.sound.sampled.Line.removeLineListener(javax.sound.sampled.LineListener) definition code for javax.sound.sampled.Line.removeLineListener(javax.sound.sampled.LineListener)
 

Method Detail

open sample code for javax.sound.sampled.SourceDataLine.open(javax.sound.sampled.AudioFormat, int) definition code for javax.sound.sampled.SourceDataLine.open(javax.sound.sampled.AudioFormat, int)

void open(AudioFormat sample code for javax.sound.sampled.AudioFormat definition code for javax.sound.sampled.AudioFormat  format,
          int bufferSize)
          throws LineUnavailableException sample code for javax.sound.sampled.LineUnavailableException definition code for javax.sound.sampled.LineUnavailableException 
Opens the line with the specified format and suggested buffer size, causing the line to acquire any required system resources and become operational.

The buffer size is specified in bytes, but must represent an integral number of sample frames. Invoking this method with a requested buffer size that does not meet this requirement may result in an IllegalArgumentException. The actual buffer size for the open line may differ from the requested buffer size. The value actually set may be queried by subsequently calling DataLine.getBufferSize() sample code for javax.sound.sampled.DataLine.getBufferSize() definition code for javax.sound.sampled.DataLine.getBufferSize() .

If this operation succeeds, the line is marked as open, and an OPEN sample code for javax.sound.sampled.LineEvent.Type.OPEN definition code for javax.sound.sampled.LineEvent.Type.OPEN event is dispatched to the line's listeners.

Invoking this method on a line which is already open is illegal and may result in an IllegalStateException.

Note that some lines, once closed, cannot be reopened. Attempts to reopen such a line will always result in a LineUnavailableException.

Parameters:
format - the desired audio format
bufferSize - the desired buffer size
Throws:
LineUnavailableException sample code for javax.sound.sampled.LineUnavailableException definition code for javax.sound.sampled.LineUnavailableException - if the line cannot be opened due to resource restrictions
IllegalArgumentException sample code for java.lang.IllegalArgumentException definition code for java.lang.IllegalArgumentException - if the buffer size does not represent an integral number of sample frames, or if format is not fully specified or invalid
IllegalStateException sample code for java.lang.IllegalStateException definition code for java.lang.IllegalStateException - if the line is already open
SecurityException sample code for java.lang.SecurityException definition code for java.lang.SecurityException - if the line cannot be opened due to security restrictions
See Also:
open(AudioFormat) sample code for javax.sound.sampled.SourceDataLine.open(javax.sound.sampled.AudioFormat) definition code for javax.sound.sampled.SourceDataLine.open(javax.sound.sampled.AudioFormat) , Line.open() sample code for javax.sound.sampled.Line.open() definition code for javax.sound.sampled.Line.open() , Line.close() sample code for javax.sound.sampled.Line.close() definition code for javax.sound.sampled.Line.close() , Line.isOpen() sample code for javax.sound.sampled.Line.isOpen() definition code for javax.sound.sampled.Line.isOpen() , LineEvent sample code for javax.sound.sampled.LineEvent definition code for javax.sound.sampled.LineEvent

open sample code for javax.sound.sampled.SourceDataLine.open(javax.sound.sampled.AudioFormat) definition code for javax.sound.sampled.SourceDataLine.open(javax.sound.sampled.AudioFormat)

void open(AudioFormat sample code for javax.sound.sampled.AudioFormat definition code for javax.sound.sampled.AudioFormat  format)
          throws LineUnavailableException sample code for javax.sound.sampled.LineUnavailableException definition code for javax.sound.sampled.LineUnavailableException 
Opens the line with the specified format, causing the line to acquire any required system resources and become operational.

The implementation chooses a buffer size, which is measured in bytes but which encompasses an integral number of sample frames. The buffer size that the system has chosen may be queried by subsequently calling DataLine.getBufferSize() sample code for javax.sound.sampled.DataLine.getBufferSize() definition code for javax.sound.sampled.DataLine.getBufferSize() .

If this operation succeeds, the line is marked as open, and an OPEN sample code for javax.sound.sampled.LineEvent.Type.OPEN definition code for javax.sound.sampled.LineEvent.Type.OPEN event is dispatched to the line's listeners.

Invoking this method on a line which is already open is illegal and may result in an IllegalStateException.

Note that some lines, once closed, cannot be reopened. Attempts to reopen such a line will always result in a LineUnavailableException.

Parameters:
format - the desired audio format
Throws:
LineUnavailableException sample code for javax.sound.sampled.LineUnavailableException definition code for javax.sound.sampled.LineUnavailableException - if the line cannot be opened due to resource restrictions
IllegalArgumentException sample code for java.lang.IllegalArgumentException definition code for java.lang.IllegalArgumentException - if format is not fully specified or invalid
IllegalStateException sample code for java.lang.IllegalStateException definition code for java.lang.IllegalStateException - if the line is already open
SecurityException sample code for java.lang.SecurityException definition code for java.lang.SecurityException - if the line cannot be opened due to security restrictions
See Also:
open(AudioFormat, int) sample code for javax.sound.sampled.SourceDataLine.open(javax.sound.sampled.AudioFormat, int) definition code for javax.sound.sampled.SourceDataLine.open(javax.sound.sampled.AudioFormat, int) , Line.open() sample code for javax.sound.sampled.Line.open() definition code for javax.sound.sampled.Line.open() , Line.close() sample code for javax.sound.sampled.Line.close() definition code for javax.sound.sampled.Line.close() , Line.isOpen() sample code for javax.sound.sampled.Line.isOpen() definition code for javax.sound.sampled.Line.isOpen() , LineEvent sample code for javax.sound.sampled.LineEvent definition code for javax.sound.sampled.LineEvent

write sample code for javax.sound.sampled.SourceDataLine.write(byte[], int, int) definition code for javax.sound.sampled.SourceDataLine.write(byte[], int, int)

int write(byte[] b,
          int off,
          int len)
Writes audio data to the mixer via this source data line. The requested number of bytes of data are read from the specified array, starting at the given offset into the array, and written to the data line's buffer. If the caller attempts to write more data than can currently be written (see available sample code for javax.sound.sampled.DataLine.available() definition code for javax.sound.sampled.DataLine.available() ), this method blocks until the requested amount of data has been written. This applies even if the requested amount of data to write is greater than the data line's buffer size. However, if the data line is closed, stopped, or flushed before the requested amount has been written, the method no longer blocks, but returns the number of bytes written thus far.

The number of bytes that can be written without blocking can be ascertained using the available sample code for javax.sound.sampled.DataLine.available() definition code for javax.sound.sampled.DataLine.available() method of the DataLine interface. (While it is guaranteed that this number of bytes can be written without blocking, there is no guarantee that attempts to write additional data will block.)

The number of bytes to write must represent an integral number of sample frames, such that:

[ bytes written ] % [frame size in bytes ] == 0

The return value will always meet this requirement. A request to write a number of bytes representing a non-integral number of sample frames cannot be fulfilled and may result in an IllegalArgumentException.

Parameters:
b - a byte array containing data to be written to the data line
len - the length, in bytes, of the valid data in the array (in other words, the requested amount of data to write, in bytes)
off - the offset from the beginning of the array, in bytes
Returns:
the number of bytes actually written
Throws:
IllegalArgumentException sample code for java.lang.IllegalArgumentException definition code for java.lang.IllegalArgumentException - if the requested number of bytes does not represent an integral number of sample frames, or if len is negative
ArrayIndexOutOfBoundsException sample code for java.lang.ArrayIndexOutOfBoundsException definition code for java.lang.ArrayIndexOutOfBoundsException - if off is negative, or off+len is greater than the length of the array b.
See Also:
TargetDataLine.read(byte[], int, int) sample code for javax.sound.sampled.TargetDataLine.read(byte[], int, int) definition code for javax.sound.sampled.TargetDataLine.read(byte[], int, int) , DataLine.available() sample code for javax.sound.sampled.DataLine.available() definition code for javax.sound.sampled.DataLine.available()