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Diffstat (limited to 'libjava/classpath/gnu/javax/sound/sampled/WAV/WAVReader.java')
| -rw-r--r-- | libjava/classpath/gnu/javax/sound/sampled/WAV/WAVReader.java | 236 |
1 files changed, 236 insertions, 0 deletions
diff --git a/libjava/classpath/gnu/javax/sound/sampled/WAV/WAVReader.java b/libjava/classpath/gnu/javax/sound/sampled/WAV/WAVReader.java new file mode 100644 index 000000000..5cd6efe5e --- /dev/null +++ b/libjava/classpath/gnu/javax/sound/sampled/WAV/WAVReader.java @@ -0,0 +1,236 @@ +/* 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()); + } +} |