143 lines
4 KiB
Java
143 lines
4 KiB
Java
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/*
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* GSMAudioFileReader.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 - 2004 by Matthias Pfisterer
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* Copyright (c) 2001 by Florian Bomers <http://www.bomers.de>
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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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|<--- this code is formatted to fit into 80 columns --->|
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*/
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package org.tritonus.sampled.file.gsm;
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import java.io.InputStream;
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import java.io.IOException;
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import java.io.EOFException;
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import java.util.HashMap;
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import java.util.Map;
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import javax.sound.sampled.AudioSystem;
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import javax.sound.sampled.AudioFormat;
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import javax.sound.sampled.AudioFileFormat;
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import javax.sound.sampled.AudioInputStream;
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import javax.sound.sampled.UnsupportedAudioFileException;
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import javax.sound.sampled.spi.AudioFileReader;
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import org.tritonus.share.TDebug;
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import org.tritonus.share.sampled.file.TAudioFileFormat;
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import org.tritonus.share.sampled.file.TAudioFileReader;
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/** AudioFileReader class for GSM 06.10 data.
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@author Matthias Pfisterer
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*/
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public class GSMAudioFileReader
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extends TAudioFileReader
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{
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private static final int GSM_MAGIC = 0xD0;
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private static final int GSM_MAGIC_MASK = 0xF0;
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private static final int MARK_LIMIT = 1;
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public GSMAudioFileReader()
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{
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super(MARK_LIMIT, true);
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}
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protected AudioFileFormat getAudioFileFormat(InputStream inputStream, long lFileSizeInBytes)
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throws UnsupportedAudioFileException, IOException
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{
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if (TDebug.TraceAudioFileReader) { TDebug.out("GSMAudioFileReader.getAudioFileFormat(): begin"); }
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int b0 = inputStream.read();
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if (b0 < 0)
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{
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throw new EOFException();
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}
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/*
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* Check for magic number.
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*/
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if ((b0 & GSM_MAGIC_MASK) != GSM_MAGIC)
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{
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throw new UnsupportedAudioFileException("not a GSM stream: wrong magic number");
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}
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/*
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If the file size is known, we derive the number of frames
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('frame size') from it.
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If the values don't fit into integers, we leave them at
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NOT_SPECIFIED. 'Unknown' is considered less incorrect than
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a wrong value.
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*/
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// [fb] not specifying it causes Sun's Wave file writer to write rubbish
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int nByteSize = AudioSystem.NOT_SPECIFIED;
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int nFrameSize = AudioSystem.NOT_SPECIFIED;
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Map<String, Object> properties = new HashMap<String, Object>();
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if (lFileSizeInBytes != AudioSystem.NOT_SPECIFIED)
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{
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// the number of GSM frames
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long lFrameSize = lFileSizeInBytes / 33;
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// duration in microseconds
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long lDuration = lFrameSize * 20000;
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properties.put("duration", lDuration);
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if (lFileSizeInBytes <= Integer.MAX_VALUE)
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{
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nByteSize = (int) lFileSizeInBytes;
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nFrameSize = (int) (lFileSizeInBytes / 33);
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}
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}
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Map<String, Object> afProperties = new HashMap<String, Object>();
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afProperties.put("bitrate", 13200L);
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AudioFormat format = new AudioFormat(
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new AudioFormat.Encoding("GSM0610"),
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8000.0F,
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AudioSystem.NOT_SPECIFIED /* ??? [sample size in bits] */,
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1,
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33,
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50.0F,
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true, // this value is chosen arbitrarily
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afProperties);
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AudioFileFormat audioFileFormat =
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new TAudioFileFormat(
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new AudioFileFormat.Type("GSM","gsm"),
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format,
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nFrameSize,
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nByteSize,
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properties);
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if (TDebug.TraceAudioFileReader) { TDebug.out("GSMAudioFileReader.getAudioFileFormat(): end"); }
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return audioFileFormat;
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}
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}
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/*** GSMAudioFileReader.java ***/
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