author | psandoz |
Mon, 16 Jun 2014 17:45:26 +0100 | |
changeset 24969 | afa6934dd8e8 |
parent 23010 | 6dadb192ad81 |
child 25144 | e2bf17cee34b |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 1999, 2013, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. Oracle designates this |
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* particular file as subject to the "Classpath" exception as provided |
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* by Oracle in the LICENSE file that accompanied this code. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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*/ |
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package javax.sound.sampled; |
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import java.util.Arrays; |
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/** |
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* <code>DataLine</code> adds media-related functionality to its |
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* superinterface, <code>{@link Line}</code>. This functionality includes |
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* transport-control methods that start, stop, drain, and flush |
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* the audio data that passes through the line. A data line can also |
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* report the current position, volume, and audio format of the media. |
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* Data lines are used for output of audio by means of the |
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* subinterfaces <code>{@link SourceDataLine}</code> or |
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* <code>{@link Clip}</code>, which allow an application program to write data. Similarly, |
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* audio input is handled by the subinterface <code>{@link TargetDataLine}</code>, |
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* which allows data to be read. |
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* <p> |
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* A data line has an internal buffer in which |
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* the incoming or outgoing audio data is queued. The |
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* <code>{@link #drain()}</code> method blocks until this internal buffer |
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* becomes empty, usually because all queued data has been processed. The |
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* <code>{@link #flush()}</code> method discards any available queued data |
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* from the internal buffer. |
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* <p> |
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* A data line produces <code>{@link LineEvent.Type#START START}</code> and |
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* <code>{@link LineEvent.Type#STOP STOP}</code> events whenever |
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* it begins or ceases active presentation or capture of data. These events |
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* can be generated in response to specific requests, or as a result of |
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* less direct state changes. For example, if <code>{@link #start()}</code> is called |
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* on an inactive data line, and data is available for capture or playback, a |
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* <code>START</code> event will be generated shortly, when data playback |
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* or capture actually begins. Or, if the flow of data to an active data |
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* line is constricted so that a gap occurs in the presentation of data, |
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* a <code>STOP</code> event is generated. |
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* <p> |
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* Mixers often support synchronized control of multiple data lines. |
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* Synchronization can be established through the Mixer interface's |
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* <code>{@link Mixer#synchronize synchronize}</code> method. |
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* See the description of the <code>{@link Mixer Mixer}</code> interface |
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* for a more complete description. |
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* |
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* @author Kara Kytle |
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* @see LineEvent |
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* @since 1.3 |
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*/ |
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public interface DataLine extends Line { |
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/** |
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* Drains queued data from the line by continuing data I/O until the |
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* data line's internal buffer has been emptied. |
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* This method blocks until the draining is complete. Because this is a |
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* blocking method, it should be used with care. If <code>drain()</code> |
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* is invoked on a stopped line that has data in its queue, the method will |
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* block until the line is running and the data queue becomes empty. If |
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* <code>drain()</code> is invoked by one thread, and another continues to |
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* fill the data queue, the operation will not complete. |
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* This method always returns when the data line is closed. |
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* |
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* @see #flush() |
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*/ |
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public void drain(); |
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/** |
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* Flushes queued data from the line. The flushed data is discarded. |
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* In some cases, not all queued data can be discarded. For example, a |
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* mixer can flush data from the buffer for a specific input line, but any |
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* unplayed data already in the output buffer (the result of the mix) will |
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* still be played. You can invoke this method after pausing a line (the |
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* normal case) if you want to skip the "stale" data when you restart |
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* playback or capture. (It is legal to flush a line that is not stopped, |
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* but doing so on an active line is likely to cause a discontinuity in the |
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* data, resulting in a perceptible click.) |
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* |
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* @see #stop() |
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* @see #drain() |
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*/ |
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public void flush(); |
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/** |
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* Allows a line to engage in data I/O. If invoked on a line |
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* that is already running, this method does nothing. Unless the data in |
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* the buffer has been flushed, the line resumes I/O starting |
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* with the first frame that was unprocessed at the time the line was |
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* stopped. When audio capture or playback starts, a |
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* <code>{@link LineEvent.Type#START START}</code> event is generated. |
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* |
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* @see #stop() |
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* @see #isRunning() |
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* @see LineEvent |
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*/ |
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public void start(); |
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/** |
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* Stops the line. A stopped line should cease I/O activity. |
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* If the line is open and running, however, it should retain the resources required |
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* to resume activity. A stopped line should retain any audio data in its buffer |
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* instead of discarding it, so that upon resumption the I/O can continue where it left off, |
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* if possible. (This doesn't guarantee that there will never be discontinuities beyond the |
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* current buffer, of course; if the stopped condition continues |
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* for too long, input or output samples might be dropped.) If desired, the retained data can be |
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* discarded by invoking the <code>flush</code> method. |
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* When audio capture or playback stops, a <code>{@link LineEvent.Type#STOP STOP}</code> event is generated. |
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* |
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* @see #start() |
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* @see #isRunning() |
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* @see #flush() |
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* @see LineEvent |
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*/ |
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public void stop(); |
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/** |
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* Indicates whether the line is running. The default is <code>false</code>. |
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* An open line begins running when the first data is presented in response to an |
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* invocation of the <code>start</code> method, and continues |
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* until presentation ceases in response to a call to <code>stop</code> or |
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* because playback completes. |
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* @return <code>true</code> if the line is running, otherwise <code>false</code> |
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* @see #start() |
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* @see #stop() |
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*/ |
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public boolean isRunning(); |
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/** |
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* Indicates whether the line is engaging in active I/O (such as playback |
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* or capture). When an inactive line becomes active, it sends a |
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* <code>{@link LineEvent.Type#START START}</code> event to its listeners. Similarly, when |
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* an active line becomes inactive, it sends a |
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* <code>{@link LineEvent.Type#STOP STOP}</code> event. |
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* @return <code>true</code> if the line is actively capturing or rendering |
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* sound, otherwise <code>false</code> |
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* @see #isOpen |
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* @see #addLineListener |
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* @see #removeLineListener |
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* @see LineEvent |
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* @see LineListener |
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*/ |
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public boolean isActive(); |
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/** |
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* Obtains the current format (encoding, sample rate, number of channels, |
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* etc.) of the data line's audio data. |
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* |
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* <p>If the line is not open and has never been opened, it returns |
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* the default format. The default format is an implementation |
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* specific audio format, or, if the <code>DataLine.Info</code> |
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* object, which was used to retrieve this <code>DataLine</code>, |
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* specifies at least one fully qualified audio format, the |
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* last one will be used as the default format. Opening the |
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* line with a specific audio format (e.g. |
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* {@link SourceDataLine#open(AudioFormat)}) will override the |
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* default format. |
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* |
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* @return current audio data format |
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* @see AudioFormat |
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*/ |
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public AudioFormat getFormat(); |
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/** |
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* Obtains the maximum number of bytes of data that will fit in the data line's |
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* internal buffer. For a source data line, this is the size of the buffer to |
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* which data can be written. For a target data line, it is the size of |
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* the buffer from which data can be read. Note that |
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* the units used are bytes, but will always correspond to an integral |
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* number of sample frames of audio data. |
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* |
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* @return the size of the buffer in bytes |
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*/ |
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public int getBufferSize(); |
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/** |
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* Obtains the number of bytes of data currently available to the |
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* application for processing in the data line's internal buffer. For a |
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* source data line, this is the amount of data that can be written to the |
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* buffer without blocking. For a target data line, this is the amount of data |
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* available to be read by the application. For a clip, this value is always |
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* 0 because the audio data is loaded into the buffer when the clip is opened, |
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* and persists without modification until the clip is closed. |
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* <p> |
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* Note that the units used are bytes, but will always |
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* correspond to an integral number of sample frames of audio data. |
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* <p> |
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* An application is guaranteed that a read or |
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* write operation of up to the number of bytes returned from |
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* <code>available()</code> will not block; however, there is no guarantee |
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* that attempts to read or write more data will block. |
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* |
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* @return the amount of data available, in bytes |
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*/ |
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public int available(); |
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/** |
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* Obtains the current position in the audio data, in sample frames. |
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* The frame position measures the number of sample |
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* frames captured by, or rendered from, the line since it was opened. |
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* This return value will wrap around after 2^31 frames. It is recommended |
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* to use <code>getLongFramePosition</code> instead. |
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* |
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* @return the number of frames already processed since the line was opened |
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* @see #getLongFramePosition() |
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*/ |
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public int getFramePosition(); |
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/** |
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* Obtains the current position in the audio data, in sample frames. |
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* The frame position measures the number of sample |
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* frames captured by, or rendered from, the line since it was opened. |
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* |
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* @return the number of frames already processed since the line was opened |
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* @since 1.5 |
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*/ |
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public long getLongFramePosition(); |
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/** |
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* Obtains the current position in the audio data, in microseconds. |
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* The microsecond position measures the time corresponding to the number |
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* of sample frames captured by, or rendered from, the line since it was opened. |
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* The level of precision is not guaranteed. For example, an implementation |
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* might calculate the microsecond position from the current frame position |
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* and the audio sample frame rate. The precision in microseconds would |
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* then be limited to the number of microseconds per sample frame. |
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* |
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* @return the number of microseconds of data processed since the line was opened |
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*/ |
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public long getMicrosecondPosition(); |
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/** |
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* Obtains the current volume level for the line. This level is a measure |
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* of the signal's current amplitude, and should not be confused with the |
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* current setting of a gain control. The range is from 0.0 (silence) to |
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* 1.0 (maximum possible amplitude for the sound waveform). The units |
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* measure linear amplitude, not decibels. |
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* |
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* @return the current amplitude of the signal in this line, or |
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* <code>{@link AudioSystem#NOT_SPECIFIED}</code> |
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*/ |
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public float getLevel(); |
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/** |
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* Besides the class information inherited from its superclass, |
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* <code>DataLine.Info</code> provides additional information specific to data lines. |
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* This information includes: |
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* <ul> |
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* <li> the audio formats supported by the data line |
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* <li> the minimum and maximum sizes of its internal buffer |
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* </ul> |
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* Because a <code>Line.Info</code> knows the class of the line its describes, a |
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* <code>DataLine.Info</code> object can describe <code>DataLine</code> |
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* subinterfaces such as <code>{@link SourceDataLine}</code>, |
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* <code>{@link TargetDataLine}</code>, and <code>{@link Clip}</code>. |
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* You can query a mixer for lines of any of these types, passing an appropriate |
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* instance of <code>DataLine.Info</code> as the argument to a method such as |
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* <code>{@link Mixer#getLine Mixer.getLine(Line.Info)}</code>. |
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* |
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* @see Line.Info |
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* @author Kara Kytle |
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* @since 1.3 |
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*/ |
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public static class Info extends Line.Info { |
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private final AudioFormat[] formats; |
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private final int minBufferSize; |
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private final int maxBufferSize; |
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/** |
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* Constructs a data line's info object from the specified information, |
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* which includes a set of supported audio formats and a range for the buffer size. |
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* This constructor is typically used by mixer implementations |
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* when returning information about a supported line. |
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* |
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* @param lineClass the class of the data line described by the info object |
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* @param formats set of formats supported |
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* @param minBufferSize minimum buffer size supported by the data line, in bytes |
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* @param maxBufferSize maximum buffer size supported by the data line, in bytes |
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*/ |
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public Info(Class<?> lineClass, AudioFormat[] formats, int minBufferSize, int maxBufferSize) { |
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super(lineClass); |
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if (formats == null) { |
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this.formats = new AudioFormat[0]; |
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} else { |
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this.formats = Arrays.copyOf(formats, formats.length); |
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} |
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this.minBufferSize = minBufferSize; |
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this.maxBufferSize = maxBufferSize; |
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} |
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/** |
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* Constructs a data line's info object from the specified information, |
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* which includes a single audio format and a desired buffer size. |
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* This constructor is typically used by an application to |
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* describe a desired line. |
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* |
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* @param lineClass the class of the data line described by the info object |
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* @param format desired format |
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* @param bufferSize desired buffer size in bytes |
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*/ |
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public Info(Class<?> lineClass, AudioFormat format, int bufferSize) { |
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super(lineClass); |
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if (format == null) { |
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this.formats = new AudioFormat[0]; |
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} else { |
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this.formats = new AudioFormat[]{format}; |
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} |
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this.minBufferSize = bufferSize; |
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this.maxBufferSize = bufferSize; |
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} |
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/** |
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* Constructs a data line's info object from the specified information, |
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* which includes a single audio format. |
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* This constructor is typically used by an application to |
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* describe a desired line. |
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* |
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* @param lineClass the class of the data line described by the info object |
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* @param format desired format |
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*/ |
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public Info(Class<?> lineClass, AudioFormat format) { |
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this(lineClass, format, AudioSystem.NOT_SPECIFIED); |
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} |
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/** |
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* Obtains a set of audio formats supported by the data line. |
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* Note that <code>isFormatSupported(AudioFormat)</code> might return |
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* <code>true</code> for certain additional formats that are missing from |
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* the set returned by <code>getFormats()</code>. The reverse is not |
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* the case: <code>isFormatSupported(AudioFormat)</code> is guaranteed to return |
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* <code>true</code> for all formats returned by <code>getFormats()</code>. |
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* |
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* Some fields in the AudioFormat instances can be set to |
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* {@link javax.sound.sampled.AudioSystem#NOT_SPECIFIED NOT_SPECIFIED} |
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* if that field does not apply to the format, |
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* or if the format supports a wide range of values for that field. |
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* For example, a multi-channel device supporting up to |
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* 64 channels, could set the channel field in the |
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* <code>AudioFormat</code> instances returned by this |
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* method to <code>NOT_SPECIFIED</code>. |
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* |
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* @return a set of supported audio formats. |
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* @see #isFormatSupported(AudioFormat) |
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*/ |
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public AudioFormat[] getFormats() { |
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return Arrays.copyOf(formats, formats.length); |
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} |
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/** |
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* Indicates whether this data line supports a particular audio format. |
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* The default implementation of this method simply returns <code>true</code> if |
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* the specified format matches any of the supported formats. |
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* |
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* @param format the audio format for which support is queried. |
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* @return <code>true</code> if the format is supported, otherwise <code>false</code> |
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* @see #getFormats |
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* @see AudioFormat#matches |
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*/ |
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public boolean isFormatSupported(AudioFormat format) { |
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392 |
for (int i = 0; i < formats.length; i++) { |
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if (format.matches(formats[i])) { |
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return true; |
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} |
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} |
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return false; |
|
399 |
} |
|
400 |
||
401 |
/** |
|
402 |
* Obtains the minimum buffer size supported by the data line. |
|
403 |
* @return minimum buffer size in bytes, or <code>AudioSystem.NOT_SPECIFIED</code> |
|
404 |
*/ |
|
405 |
public int getMinBufferSize() { |
|
406 |
return minBufferSize; |
|
407 |
} |
|
408 |
||
409 |
||
410 |
/** |
|
411 |
* Obtains the maximum buffer size supported by the data line. |
|
412 |
* @return maximum buffer size in bytes, or <code>AudioSystem.NOT_SPECIFIED</code> |
|
413 |
*/ |
|
414 |
public int getMaxBufferSize() { |
|
415 |
return maxBufferSize; |
|
416 |
} |
|
417 |
||
418 |
||
419 |
/** |
|
420 |
* Determines whether the specified info object matches this one. |
|
421 |
* To match, the superclass match requirements must be met. In |
|
422 |
* addition, this object's minimum buffer size must be at least as |
|
423 |
* large as that of the object specified, its maximum buffer size must |
|
424 |
* be at most as large as that of the object specified, and all of its |
|
425 |
* formats must match formats supported by the object specified. |
|
426 |
* @return <code>true</code> if this object matches the one specified, |
|
427 |
* otherwise <code>false</code>. |
|
428 |
*/ |
|
429 |
public boolean matches(Line.Info info) { |
|
430 |
||
431 |
if (! (super.matches(info)) ) { |
|
432 |
return false; |
|
433 |
} |
|
434 |
||
435 |
Info dataLineInfo = (Info)info; |
|
436 |
||
437 |
// treat anything < 0 as NOT_SPECIFIED |
|
438 |
// demo code in old Java Sound Demo used a wrong buffer calculation |
|
439 |
// that would lead to arbitrary negative values |
|
440 |
if ((getMaxBufferSize() >= 0) && (dataLineInfo.getMaxBufferSize() >= 0)) { |
|
441 |
if (getMaxBufferSize() > dataLineInfo.getMaxBufferSize()) { |
|
442 |
return false; |
|
443 |
} |
|
444 |
} |
|
445 |
||
446 |
if ((getMinBufferSize() >= 0) && (dataLineInfo.getMinBufferSize() >= 0)) { |
|
447 |
if (getMinBufferSize() < dataLineInfo.getMinBufferSize()) { |
|
448 |
return false; |
|
449 |
} |
|
450 |
} |
|
451 |
||
452 |
AudioFormat[] localFormats = getFormats(); |
|
453 |
||
454 |
if (localFormats != null) { |
|
455 |
||
456 |
for (int i = 0; i < localFormats.length; i++) { |
|
457 |
if (! (localFormats[i] == null) ) { |
|
458 |
if (! (dataLineInfo.isFormatSupported(localFormats[i])) ) { |
|
459 |
return false; |
|
460 |
} |
|
461 |
} |
|
462 |
} |
|
463 |
} |
|
464 |
||
465 |
return true; |
|
466 |
} |
|
467 |
||
468 |
/** |
|
469 |
* Obtains a textual description of the data line info. |
|
470 |
* @return a string description |
|
471 |
*/ |
|
472 |
public String toString() { |
|
473 |
||
24969
afa6934dd8e8
8041679: Replace uses of StringBuffer with StringBuilder within core library classes
psandoz
parents:
23010
diff
changeset
|
474 |
StringBuilder sb = new StringBuilder(); |
2 | 475 |
|
476 |
if ( (formats.length == 1) && (formats[0] != null) ) { |
|
24969
afa6934dd8e8
8041679: Replace uses of StringBuffer with StringBuilder within core library classes
psandoz
parents:
23010
diff
changeset
|
477 |
sb.append(" supporting format " + formats[0]); |
2 | 478 |
} else if (getFormats().length > 1) { |
24969
afa6934dd8e8
8041679: Replace uses of StringBuffer with StringBuilder within core library classes
psandoz
parents:
23010
diff
changeset
|
479 |
sb.append(" supporting " + getFormats().length + " audio formats"); |
2 | 480 |
} |
481 |
||
482 |
if ( (minBufferSize != AudioSystem.NOT_SPECIFIED) && (maxBufferSize != AudioSystem.NOT_SPECIFIED) ) { |
|
24969
afa6934dd8e8
8041679: Replace uses of StringBuffer with StringBuilder within core library classes
psandoz
parents:
23010
diff
changeset
|
483 |
sb.append(", and buffers of " + minBufferSize + " to " + maxBufferSize + " bytes"); |
2 | 484 |
} else if ( (minBufferSize != AudioSystem.NOT_SPECIFIED) && (minBufferSize > 0) ) { |
24969
afa6934dd8e8
8041679: Replace uses of StringBuffer with StringBuilder within core library classes
psandoz
parents:
23010
diff
changeset
|
485 |
sb.append(", and buffers of at least " + minBufferSize + " bytes"); |
2 | 486 |
} else if (maxBufferSize != AudioSystem.NOT_SPECIFIED) { |
24969
afa6934dd8e8
8041679: Replace uses of StringBuffer with StringBuilder within core library classes
psandoz
parents:
23010
diff
changeset
|
487 |
sb.append(", and buffers of up to " + minBufferSize + " bytes"); |
2 | 488 |
} |
489 |
||
24969
afa6934dd8e8
8041679: Replace uses of StringBuffer with StringBuilder within core library classes
psandoz
parents:
23010
diff
changeset
|
490 |
return new String(super.toString() + sb); |
2 | 491 |
} |
492 |
} // class Info |
|
493 |
||
494 |
} // interface DataLine |