mirror of git://gcc.gnu.org/git/gcc.git
272 lines
7.3 KiB
Java
272 lines
7.3 KiB
Java
/*
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Copyright (C) 2005-2007 Free Software Foundation, Inc.
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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package javax.sound.sampled;
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import gnu.java.lang.CPStringBuilder;
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/**
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* The DataLine interface adds data-related functionality to the Line
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* interface. For example, it adds methods to start and stop the data
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* on the line.
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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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/**
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* This class extends Line.Info with information specific to DataLine.
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* In particular it adds information about buffer sizes, and about supported
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* audio formats.
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* @since 1.3
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*/
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class Info extends Line.Info
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{
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private int minBufferSize;
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private int maxBufferSize;
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private AudioFormat[] formats;
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/**
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* Create a new Info given the line's class and a supported
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* audio format. The buffer sizes default to AudioSystem.NOT_SPECIFIED.
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* @param klass the class of the line
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* @param fmt the supported format
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*/
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public Info(Class<?> klass, AudioFormat fmt)
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{
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super(klass);
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this.minBufferSize = AudioSystem.NOT_SPECIFIED;
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this.maxBufferSize = AudioSystem.NOT_SPECIFIED;
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this.formats = new AudioFormat[] { fmt };
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}
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/**
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* Create a new Info given the line's class, the supported audio formats,
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* the minimum buffer size, and the maximum buffer size.
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* @param klass the class of the linee
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* @param fmts the supported audio formats
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* @param minSize the minimum buffer size
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* @param maxSize the maximum buffer size
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*/
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public Info(Class<?> klass, AudioFormat[] fmts, int minSize, int maxSize)
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{
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super(klass);
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this.minBufferSize = minSize;
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this.maxBufferSize = maxSize;
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this.formats = fmts;
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}
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/**
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* Create a new Info given the line's class, a supported
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* audio format, and a buffer size. Both the minimum and maximum
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* sizes are set from this size.
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* @param klass the class of the line
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* @param fmt the supported format
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* @param size the buffer size
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*/
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public Info(Class<?> klass, AudioFormat fmt, int size)
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{
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super(klass);
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this.minBufferSize = size;
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this.maxBufferSize = size;
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this.formats = new AudioFormat[] { fmt };
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}
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/**
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* Return the supported audio formats.
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*/
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public AudioFormat[] getFormats()
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{
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// FIXME: clone?
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return formats;
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}
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/**
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* Return the maximum buffer size.
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*/
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public int getMaxBufferSize()
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{
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return maxBufferSize;
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}
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/**
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* Return the minimum buffer size.
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*/
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public int getMinBufferSize()
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{
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return minBufferSize;
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}
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/**
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* Return true if the indicated audio format is supported by this
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* Info, false otherwise.
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* @param fmt the audio format
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* @return true if the format is supported
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*/
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public boolean isFormatSupported(AudioFormat fmt)
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{
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for (int i = 0; i < formats.length; ++i)
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{
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if (fmt.matches(formats[i]))
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return true;
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}
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return false;
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}
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/**
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* Return true if this Info matches another Info object.
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*/
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public boolean matches(Line.Info o)
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{
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if (! super.matches(o) || ! (o instanceof Info))
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return false;
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Info other = (Info) o;
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if (minBufferSize < other.minBufferSize ||
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maxBufferSize > other.maxBufferSize)
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return false;
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for (int i = 0; i < formats.length; ++i)
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{
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boolean ok = false;
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for (int j = 0; j < other.formats.length; ++j)
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{
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if (formats[i].matches(other.formats[j]))
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{
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ok = true;
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break;
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}
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}
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if (! ok)
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return false;
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}
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return true;
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}
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/**
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* Return a description of this Info object.
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*/
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public String toString()
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{
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CPStringBuilder result = new CPStringBuilder();
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result.append("formats: [");
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for (int i = 0; i < formats.length; ++i)
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{
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if (i > 0)
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result.append(", ");
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result.append(formats[i].toString());
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}
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result.append("]; minBufferSize: ");
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result.append(minBufferSize);
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result.append("; maxBufferSize: ");
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result.append(maxBufferSize);
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return result.toString();
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}
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} // end class: Info
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/**
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* Return the number of bytes currently available on this DataLine.
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*/
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int available();
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/**
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* This method blocks until whatever data is buffered in the
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* DataLine's internal buffer has been drained.
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*/
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void drain();
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/**
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* This flushes the DataLine by discarding any buffered data.
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*/
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void flush();
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/**
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* Returns the size of the DataLine's internal buffer, in bytes.
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*/
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int getBufferSize();
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/**
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* Return the current format of the data associated with this DataLine.
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*/
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AudioFormat getFormat();
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/**
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* Return the current frame position.
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*/
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int getFramePosition();
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/**
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* Return the volume level for this DataLine.
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*/
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float getLevel();
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/**
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* Return the current frame position.
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* @since 1.5
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*/
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long getLongFramePosition();
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/**
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* Return the number of microseconds this DataLine has been playing.
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*/
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long getMicrosecondPosition();
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/**
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* Return true if this line is active, meaning that it is actively
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* performing audio I/O.
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*/
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boolean isActive();
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/**
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* Return true if this line is running, meaning that it has been
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* started. When the line is stopped, this method will return false.
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*/
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boolean isRunning();
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/**
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* Start processing data. This will emit a START event.
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*/
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void start();
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/**
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* Stop processing data. This will emit a STOP event.
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*/
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void stop();
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}
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