| /* WAVReader.java -- Read WAV files. |
| Copyright (C) 2006 Free Software Foundation, Inc. |
| |
| This file is part of GNU Classpath. |
| |
| GNU Classpath is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 2, or (at your option) |
| any later version. |
| |
| GNU Classpath is distributed in the hope that it will be useful, but |
| WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with GNU Classpath; see the file COPYING. If not, write to the |
| Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
| 02110-1301 USA. |
| |
| Linking this library statically or dynamically with other modules is |
| making a combined work based on this library. Thus, the terms and |
| conditions of the GNU General Public License cover the whole |
| combination. |
| |
| As a special exception, the copyright holders of this library give you |
| permission to link this library with independent modules to produce an |
| executable, regardless of the license terms of these independent |
| modules, and to copy and distribute the resulting executable under |
| terms of your choice, provided that you also meet, for each linked |
| independent module, the terms and conditions of the license of that |
| module. An independent module is a module which is not derived from |
| or based on this library. If you modify this library, you may extend |
| this exception to your version of the library, but you are not |
| obligated to do so. If you do not wish to do so, delete this |
| exception statement from your version. */ |
| |
| package gnu.javax.sound.sampled.WAV; |
| |
| import java.io.File; |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.io.DataInputStream; |
| import java.io.FileInputStream; |
| import java.net.URL; |
| |
| import javax.sound.sampled.AudioFormat; |
| import javax.sound.sampled.AudioFileFormat; |
| import javax.sound.sampled.AudioInputStream; |
| import javax.sound.sampled.UnsupportedAudioFileException; |
| import javax.sound.sampled.spi.AudioFileReader; |
| |
| /** |
| * A WAV file reader. |
| * |
| * This code reads WAV files. |
| * |
| * There are many decent documents on the web describing the WAV file |
| * format. I didn't bother looking for the official document. If it |
| * exists, I'm not even sure if it is freely available. We should |
| * update this comment if we find out anything helpful here. I used |
| * http://www.sonicspot.com/guide/wavefiles.html |
| * |
| * @author Anthony Green (green@redhat.com) |
| * |
| */ |
| public class WAVReader extends AudioFileReader |
| { |
| private static long readUnsignedIntLE (DataInputStream is) |
| throws IOException |
| { |
| byte[] buf = new byte[4]; |
| is.readFully(buf); |
| return (buf[0] & 0xFF |
| | ((buf[1] & 0xFF) << 8) |
| | ((buf[2] & 0xFF) << 16) |
| | ((buf[3] & 0xFF) << 24)); |
| } |
| |
| private static short readUnsignedShortLE (DataInputStream is) |
| throws IOException |
| { |
| byte[] buf = new byte[2]; |
| is.readFully(buf); |
| return (short) (buf[0] & 0xFF |
| | ((buf[1] & 0xFF) << 8)); |
| } |
| |
| /* Get an AudioFileFormat from the given File. |
| * @see javax.sound.sampled.spi.AudioFileReader#getAudioFileFormat(java.io.File) |
| */ |
| public AudioFileFormat getAudioFileFormat(File file) |
| throws UnsupportedAudioFileException, IOException |
| { |
| InputStream is = new FileInputStream(file); |
| try |
| { |
| return getAudioFileFormat(is); |
| } |
| finally |
| { |
| is.close(); |
| } |
| } |
| |
| /* Get an AudioFileFormat from the given InputStream. |
| * @see javax.sound.sampled.spi.AudioFileReader#getAudioFileFormat(java.io.InputStream) |
| */ |
| public AudioFileFormat getAudioFileFormat(InputStream in) |
| throws UnsupportedAudioFileException, IOException |
| { |
| DataInputStream din; |
| |
| if (in instanceof DataInputStream) |
| din = (DataInputStream) in; |
| else |
| din = new DataInputStream(in); |
| |
| if (din.readInt() != 0x52494646) // "RIFF" |
| throw new UnsupportedAudioFileException("Invalid WAV chunk header."); |
| |
| // Read the length of this RIFF thing. |
| readUnsignedIntLE(din); |
| |
| if (din.readInt() != 0x57415645) // "WAVE" |
| throw new UnsupportedAudioFileException("Invalid WAV chunk header."); |
| |
| boolean foundFmt = false; |
| boolean foundData = false; |
| |
| short compressionCode = 0, numberChannels = 0, blockAlign = 0, bitsPerSample = 0; |
| long sampleRate = 0, bytesPerSecond = 0; |
| long chunkLength = 0; |
| |
| while (! foundData) |
| { |
| int chunkId = din.readInt(); |
| chunkLength = readUnsignedIntLE(din); |
| switch (chunkId) |
| { |
| case 0x666D7420: // "fmt " |
| foundFmt = true; |
| compressionCode = readUnsignedShortLE(din); |
| numberChannels = readUnsignedShortLE(din); |
| sampleRate = readUnsignedIntLE(din); |
| bytesPerSecond = readUnsignedIntLE(din); |
| blockAlign = readUnsignedShortLE(din); |
| bitsPerSample = readUnsignedShortLE(din); |
| din.skip(chunkLength - 16); |
| break; |
| case 0x66616374: // "fact" |
| // FIXME: hold compression format dependent data. |
| din.skip(chunkLength); |
| break; |
| case 0x64617461: // "data" |
| if (! foundFmt) |
| throw new UnsupportedAudioFileException("This implementation requires WAV fmt chunks precede data chunks."); |
| foundData = true; |
| break; |
| default: |
| // Unrecognized chunk. Skip it. |
| din.skip(chunkLength); |
| } |
| } |
| |
| AudioFormat.Encoding encoding; |
| |
| switch (compressionCode) |
| { |
| case 1: // PCM/uncompressed |
| if (bitsPerSample <= 8) |
| encoding = AudioFormat.Encoding.PCM_UNSIGNED; |
| else |
| encoding = AudioFormat.Encoding.PCM_SIGNED; |
| break; |
| |
| default: |
| throw new UnsupportedAudioFileException("Unrecognized WAV compression code: 0x" |
| + Integer.toHexString(compressionCode)); |
| } |
| |
| return new AudioFileFormat (AudioFileFormat.Type.WAVE, |
| new AudioFormat(encoding, |
| (float) sampleRate, |
| bitsPerSample, |
| numberChannels, |
| ((bitsPerSample + 7) / 8) * numberChannels, |
| (float) bytesPerSecond, false), |
| (int) chunkLength); |
| } |
| |
| /* Get an AudioFileFormat from the given URL. |
| * @see javax.sound.sampled.spi.AudioFileReader#getAudioFileFormat(java.net.URL) |
| */ |
| public AudioFileFormat getAudioFileFormat(URL url) |
| throws UnsupportedAudioFileException, IOException |
| { |
| InputStream is = url.openStream(); |
| try |
| { |
| return getAudioFileFormat(is); |
| } |
| finally |
| { |
| is.close(); |
| } |
| } |
| |
| /* Get an AudioInputStream from the given File. |
| * @see javax.sound.sampled.spi.AudioFileReader#getAudioInputStream(java.io.File) |
| */ |
| public AudioInputStream getAudioInputStream(File file) |
| throws UnsupportedAudioFileException, IOException |
| { |
| return getAudioInputStream(new FileInputStream(file)); |
| } |
| |
| /* Get an AudioInputStream from the given InputStream. |
| * @see javax.sound.sampled.spi.AudioFileReader#getAudioInputStream(java.io.InputStream) |
| */ |
| public AudioInputStream getAudioInputStream(InputStream stream) |
| throws UnsupportedAudioFileException, IOException |
| { |
| AudioFileFormat aff = getAudioFileFormat(stream); |
| return new AudioInputStream(stream, aff.getFormat(), (long) aff.getFrameLength()); |
| } |
| |
| /* Get an AudioInputStream from the given URL. |
| * @see javax.sound.sampled.spi.AudioFileReader#getAudioInputStream(java.net.URL) |
| */ |
| public AudioInputStream getAudioInputStream(URL url) |
| throws UnsupportedAudioFileException, IOException |
| { |
| return getAudioInputStream(url.openStream()); |
| } |
| } |