/*
 * @(#)SourceDataLine.java	1.21 05/11/17
 *
 * Copyright 2006 Sun Microsystems, Inc. All rights reserved.
 * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 */

package javax.sound.sampled;	


/**
 * 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).
 * <p>
 * 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.
 * <p>
 * A source data line can be obtained from a mixer by invoking the 
 * <code>{@link Mixer#getLine getLine}</code> method of <code>Mixer</code> with 
 * an appropriate <code>{@link DataLine.Info}</code> object.
 * <p>
 * The <code>SourceDataLine</code> 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 
 * <code>{@link DataLine#available available}</code> method defined in the
 * <code>DataLine</code> 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 <code>{@link LineEvent.Type#STOP STOP}</code> event is 
 * generated.  A <code>{@link LineEvent.Type#START START}</code> event is generated
 * when the audio output resumes. 
 *
 * @author Kara Kytle
 * @version 1.21 05/11/17
 * @see Mixer
 * @see DataLine
 * @see TargetDataLine
 * @since 1.3
 */
public interface SourceDataLine extends DataLine {
	

    /**
     * Opens the line with the specified format and suggested buffer size,
     * causing the line to acquire any required
     * system resources and become operational.
     * <p>
     * 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 <code>{@link DataLine#getBufferSize}</code>.  
     * <p>
     * If this operation succeeds, the line is marked as open, and an 
     * <code>{@link LineEvent.Type#OPEN OPEN}</code> event is dispatched to the 
     * line's listeners.
     * <p>
     * Invoking this method on a line which is already open is illegal
     * and may result in an <code>IllegalStateException</code>.
     * <p>
     * Note that some lines, once closed, cannot be reopened.  Attempts
     * to reopen such a line will always result in a 
     * <code>LineUnavailableException</code>.
     *
     * @param format the desired audio format
     * @param bufferSize the desired buffer size
     * @throws LineUnavailableException if the line cannot be
     * opened due to resource restrictions
     * @throws IllegalArgumentException if the buffer size does not represent
     * an integral number of sample frames,
     * or if <code>format</code> is not fully specified or invalid
     * @throws IllegalStateException if the line is already open
     * @throws SecurityException if the line cannot be
     * opened due to security restrictions
     *
     * @see #open(AudioFormat)
     * @see Line#open
     * @see Line#close
     * @see Line#isOpen
     * @see LineEvent
     */
    public void open(AudioFormat format, int bufferSize) throws LineUnavailableException;


    /**
     * Opens the line with the specified format, causing the line to acquire any 
     * required system resources and become operational.  
     *   
     * <p>
     * The implementation chooses a buffer size, which is measured in bytes but 
     * which encompasses an integral number of sample frames.  The buffer size