| /* | |
| * Copyright (c) 1999, 2024, Oracle and/or its affiliates. All rights reserved. | |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | |
| * | |
| * This code is free software; you can redistribute it and/or modify it | |
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| * published by the Free Software Foundation. Oracle designates this | |
| * particular file as subject to the "Classpath" exception as provided | |
| * by Oracle in the LICENSE file that accompanied this code. | |
| * | |
| * This code is distributed in the hope that it will be useful, but WITHOUT | |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| * version 2 for more details (a copy is included in the LICENSE file that | |
| * accompanied this code). | |
| * | |
| * You should have received a copy of the GNU General Public License version | |
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| */ | |
| 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 | |
| * {@link Mixer#getLine getLine} method of {@code Mixer} with an appropriate | |
| * {@link DataLine.Info} object. | |
| * <p> | |
| * The {@code 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 | |
| * {@link DataLine#available available} method defined in the {@code 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 | |
| * {@link LineEvent.Type#STOP STOP} event is generated. A | |
| * {@link LineEvent.Type#START START} event is generated when the audio output | |
| * resumes. | |
| * | |
| * @author Kara Kytle | |
| * @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 | |
| * {@code 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 {@link DataLine#getBufferSize}. | |
| * <p> | |
| * If this operation succeeds, the line is marked as open, and an | |
| * {@link LineEvent.Type#OPEN OPEN} 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}. | |
| * <p> | |
| * Note that some lines, once closed, cannot be reopened. Attempts to reopen | |
| * such a line will always result in a {@code LineUnavailableException}. | |
| * | |
| * @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} is not | |
| * fully specified or invalid | |
| * @throws IllegalStateException if the line is already open | |
| * @see #open(AudioFormat) | |
| * @see Line#open | |
| * @see Line#close | |
| * @see Line#isOpen | |
| * @see LineEvent | |
| */ | |
| 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 | |
| * that the system has chosen may be queried by subsequently calling | |
| * {@link DataLine#getBufferSize}. | |
| * <p> | |
| * If this operation succeeds, the line is marked as open, and an | |
| * {@link LineEvent.Type#OPEN OPEN} 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}. | |
| * <p> | |
| * Note that some lines, once closed, cannot be reopened. Attempts to reopen | |
| * such a line will always result in a {@code LineUnavailableException}. | |
| * | |
| * @param format the desired audio format | |
| * @throws LineUnavailableException if the line cannot be opened due to | |
| * resource restrictions | |
| * @throws IllegalArgumentException if {@code format} is not fully specified | |
| * or invalid | |
| * @throws IllegalStateException if the line is already open | |
| * @see #open(AudioFormat, int) | |
| * @see Line#open | |
| * @see Line#close | |
| * @see Line#isOpen | |
| * @see LineEvent | |
| */ | |
| void open(AudioFormat format) throws LineUnavailableException; | |
| /** | |
| * 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 {@link DataLine#available 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. | |
| * <p> | |
| * The number of bytes that can be written without blocking can be | |
| * ascertained using the {@link DataLine#available available} method of the | |
| * {@code 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.) | |
| * <p> | |
| * The number of bytes to write must represent an integral number of sample | |
| * frames, such that: | |
| * <p style="text-align:center"> | |
| * {@code [ bytes written ] % [frame size in bytes ] == 0} | |
| * <p> | |
| * 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 | |
| * {@code IllegalArgumentException}. | |
| * | |
| * @param b a byte array containing data to be written to the data line | |
| * @param off the offset from the beginning of the array, in bytes | |
| * @param len the length, in bytes, of the valid data in the array (in | |
| * other words, the requested amount of data to write, in bytes) | |
| * @return the number of bytes actually written | |
| * @throws IllegalArgumentException if the requested number of bytes does | |
| * not represent an integral number of sample frames, or if | |
| * {@code len} is negative | |
| * @throws ArrayIndexOutOfBoundsException if {@code off} is negative, or | |
| * {@code off+len} is greater than the length of the array {@code b} | |
| * @see TargetDataLine#read | |
| * @see DataLine#available | |
| */ | |
| int write(byte[] b, int off, int len); | |
| /** | |
| * Obtains the number of sample frames of audio data that can be written to | |
| * the mixer, via this data line, without blocking. Note that the return | |
| * value measures sample frames, not bytes. | |
| * | |
| * @return the number of sample frames currently available for writing | |
| * @see TargetDataLine#availableRead | |
| */ | |
| //public int availableWrite(); | |
| } |