9fee0ec4ca
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@7101 a1c6a512-1295-4272-9138-f99709370657
131 lines
4.4 KiB
Java
131 lines
4.4 KiB
Java
/*
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* AudioFormats.java
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*
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* This file is part of Tritonus: http://www.tritonus.org/
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*/
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/*
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* Copyright (c) 1999,2000 by Matthias Pfisterer
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* Copyright (c) 1999 by Florian Bomers <http://www.bomers.de>
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*
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Library General Public License as published
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* by the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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*/
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/*
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|<--- this code is formatted to fit into 80 columns --->|
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*/
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package org.tritonus.share.sampled;
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import javax.sound.sampled.AudioFormat;
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import javax.sound.sampled.AudioSystem;
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public class AudioFormats
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{
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private static boolean doMatch(int i1, int i2)
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{
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return i1 == AudioSystem.NOT_SPECIFIED
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|| i2 == AudioSystem.NOT_SPECIFIED
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|| i1 == i2;
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}
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private static boolean doMatch(float f1, float f2)
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{
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return f1 == AudioSystem.NOT_SPECIFIED
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|| f2 == AudioSystem.NOT_SPECIFIED
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|| Math.abs(f1 - f2) < 1.0e-9;
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}
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/**
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* Tests whether 2 AudioFormats have matching formats.
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* A field matches when it is AudioSystem.NOT_SPECIFIED in
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* at least one of the formats or the field is the same
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* in both formats.<br>
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* Exceptions:
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* <ul>
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* <li>Encoding must always be equal for a match.
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* <li> For a match, endianness must be equal if SampleSizeInBits is not
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* AudioSystem.NOT_SPECIFIED and greater than 8bit in both formats.<br>
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* In other words: If SampleSizeInBits is AudioSystem.NOT_SPECIFIED
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* in either format or both formats have a SampleSizeInBits<8,
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* endianness does not matter.
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* </ul>
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* This is a proposition to be used as AudioFormat.matches.
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* It can therefore be considered as a temporary workaround.
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*/
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// IDEA: create a special "NOT_SPECIFIED" encoding
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// and a AudioFormat.Encoding.matches method.
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public static boolean matches(AudioFormat format1,
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AudioFormat format2)
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{
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//$$fb 19 Dec 99: endian must be checked, too.
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//
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// we do have a problem with redundant elements:
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// e.g.
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// encoding=ALAW || ULAW -> bigEndian and samplesizeinbits don't matter
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// sample size in bits == 8 -> bigEndian doesn't matter
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// sample size in bits > 8 -> PCM is always signed.
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// This is an overall issue in JavaSound, I think.
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// At present, it is not consistently implemented to support these
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// redundancies and implicit definitions
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//
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// As a workaround of this issue I return in the converters
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// all combinations, e.g. for ULAW I return bigEndian and !bigEndian formats.
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/* old version
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*/
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// as proposed by florian
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return format1.getEncoding().equals(format2.getEncoding())
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&& (format2.getSampleSizeInBits()<=8
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|| format1.getSampleSizeInBits()==AudioSystem.NOT_SPECIFIED
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|| format2.getSampleSizeInBits()==AudioSystem.NOT_SPECIFIED
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|| format1.isBigEndian()==format2.isBigEndian())
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&& doMatch(format1.getChannels(),format2.getChannels())
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&& doMatch(format1.getSampleSizeInBits(), format2.getSampleSizeInBits())
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&& doMatch(format1.getFrameSize(), format2.getFrameSize())
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&& doMatch(format1.getSampleRate(), format2.getSampleRate())
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&& doMatch(format1.getFrameRate(),format2.getFrameRate());
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}
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/**
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* Tests for exact equality of 2 AudioFormats.
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* This is the behaviour of AudioFormat.matches in JavaSound 1.0.
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* <p>
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* This is a proposition to be used as AudioFormat.equals.
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* It can therefore be considered as a temporary workaround.
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*/
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public static boolean equals(AudioFormat format1,
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AudioFormat format2)
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{
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return format1.getEncoding().equals(format2.getEncoding())
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&& format1.getChannels() == format2.getChannels()
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&& format1.getSampleSizeInBits() == format2.getSampleSizeInBits()
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&& format1.getFrameSize() == format2.getFrameSize()
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&& (Math.abs(format1.getSampleRate() - format2.getSampleRate()) < 1.0e-9)
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&& (Math.abs(format1.getFrameRate() - format2.getFrameRate()) < 1.0e-9);
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}
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}
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/*** AudioFormats.java ***/
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