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jeremybenn |
/* WAVReader.java -- Read WAV files.
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Copyright (C) 2006 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 gnu.javax.sound.sampled.WAV;
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import java.io.File;
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import java.io.IOException;
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import java.io.InputStream;
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import java.io.DataInputStream;
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import java.io.FileInputStream;
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import java.net.URL;
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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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/**
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* A WAV file reader.
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*
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* This code reads WAV files.
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*
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* There are many decent documents on the web describing the WAV file
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* format. I didn't bother looking for the official document. If it
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* exists, I'm not even sure if it is freely available. We should
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* update this comment if we find out anything helpful here. I used
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* http://www.sonicspot.com/guide/wavefiles.html
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*
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* @author Anthony Green (green@redhat.com)
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*
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*/
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public class WAVReader extends AudioFileReader
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{
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private static long readUnsignedIntLE (DataInputStream is)
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throws IOException
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{
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byte[] buf = new byte[4];
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is.readFully(buf);
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return (buf[0] & 0xFF
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| ((buf[1] & 0xFF) << 8)
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| ((buf[2] & 0xFF) << 16)
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| ((buf[3] & 0xFF) << 24));
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}
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private static short readUnsignedShortLE (DataInputStream is)
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throws IOException
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{
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byte[] buf = new byte[2];
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is.readFully(buf);
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return (short) (buf[0] & 0xFF
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| ((buf[1] & 0xFF) << 8));
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}
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/* Get an AudioFileFormat from the given File.
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* @see javax.sound.sampled.spi.AudioFileReader#getAudioFileFormat(java.io.File)
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*/
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public AudioFileFormat getAudioFileFormat(File file)
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throws UnsupportedAudioFileException, IOException
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{
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InputStream is = new FileInputStream(file);
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try
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{
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return getAudioFileFormat(is);
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}
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finally
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{
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is.close();
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}
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}
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/* Get an AudioFileFormat from the given InputStream.
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* @see javax.sound.sampled.spi.AudioFileReader#getAudioFileFormat(java.io.InputStream)
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*/
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public AudioFileFormat getAudioFileFormat(InputStream in)
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throws UnsupportedAudioFileException, IOException
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{
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DataInputStream din;
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if (in instanceof DataInputStream)
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din = (DataInputStream) in;
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else
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din = new DataInputStream(in);
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if (din.readInt() != 0x52494646) // "RIFF"
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throw new UnsupportedAudioFileException("Invalid WAV chunk header.");
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// Read the length of this RIFF thing.
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readUnsignedIntLE(din);
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if (din.readInt() != 0x57415645) // "WAVE"
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throw new UnsupportedAudioFileException("Invalid WAV chunk header.");
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boolean foundFmt = false;
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boolean foundData = false;
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short compressionCode = 0, numberChannels = 0, blockAlign = 0, bitsPerSample = 0;
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long sampleRate = 0, bytesPerSecond = 0;
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long chunkLength = 0;
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while (! foundData)
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{
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int chunkId = din.readInt();
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chunkLength = readUnsignedIntLE(din);
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switch (chunkId)
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{
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case 0x666D7420: // "fmt "
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foundFmt = true;
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compressionCode = readUnsignedShortLE(din);
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numberChannels = readUnsignedShortLE(din);
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sampleRate = readUnsignedIntLE(din);
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bytesPerSecond = readUnsignedIntLE(din);
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blockAlign = readUnsignedShortLE(din);
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bitsPerSample = readUnsignedShortLE(din);
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din.skip(chunkLength - 16);
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break;
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case 0x66616374: // "fact"
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// FIXME: hold compression format dependent data.
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din.skip(chunkLength);
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break;
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case 0x64617461: // "data"
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if (! foundFmt)
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throw new UnsupportedAudioFileException("This implementation requires WAV fmt chunks precede data chunks.");
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foundData = true;
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break;
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default:
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// Unrecognized chunk. Skip it.
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din.skip(chunkLength);
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}
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}
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AudioFormat.Encoding encoding;
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switch (compressionCode)
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{
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case 1: // PCM/uncompressed
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if (bitsPerSample <= 8)
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encoding = AudioFormat.Encoding.PCM_UNSIGNED;
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else
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encoding = AudioFormat.Encoding.PCM_SIGNED;
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break;
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default:
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throw new UnsupportedAudioFileException("Unrecognized WAV compression code: 0x"
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+ Integer.toHexString(compressionCode));
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}
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return new AudioFileFormat (AudioFileFormat.Type.WAVE,
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new AudioFormat(encoding,
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(float) sampleRate,
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bitsPerSample,
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numberChannels,
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((bitsPerSample + 7) / 8) * numberChannels,
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(float) bytesPerSecond, false),
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(int) chunkLength);
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}
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/* Get an AudioFileFormat from the given URL.
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* @see javax.sound.sampled.spi.AudioFileReader#getAudioFileFormat(java.net.URL)
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*/
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public AudioFileFormat getAudioFileFormat(URL url)
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throws UnsupportedAudioFileException, IOException
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{
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InputStream is = url.openStream();
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try
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{
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return getAudioFileFormat(is);
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}
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finally
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{
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is.close();
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}
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}
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/* Get an AudioInputStream from the given File.
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* @see javax.sound.sampled.spi.AudioFileReader#getAudioInputStream(java.io.File)
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*/
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public AudioInputStream getAudioInputStream(File file)
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throws UnsupportedAudioFileException, IOException
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{
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return getAudioInputStream(new FileInputStream(file));
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}
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/* Get an AudioInputStream from the given InputStream.
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* @see javax.sound.sampled.spi.AudioFileReader#getAudioInputStream(java.io.InputStream)
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*/
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public AudioInputStream getAudioInputStream(InputStream stream)
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throws UnsupportedAudioFileException, IOException
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{
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AudioFileFormat aff = getAudioFileFormat(stream);
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return new AudioInputStream(stream, aff.getFormat(), (long) aff.getFrameLength());
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}
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/* Get an AudioInputStream from the given URL.
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* @see javax.sound.sampled.spi.AudioFileReader#getAudioInputStream(java.net.URL)
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*/
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public AudioInputStream getAudioInputStream(URL url)
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throws UnsupportedAudioFileException, IOException
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{
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return getAudioInputStream(url.openStream());
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}
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}
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