| /* AUReader.java -- Read AU 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.AU; |
| |
| import javax.sound.sampled.AudioFormat; |
| import javax.sound.sampled.AudioSystem; |
| import javax.sound.sampled.AudioFileFormat; |
| import javax.sound.sampled.AudioInputStream; |
| import javax.sound.sampled.UnsupportedAudioFileException; |
| import javax.sound.sampled.spi.AudioFileReader; |
| import java.io.File; |
| import java.io.IOException; |
| import java.io.BufferedInputStream; |
| import java.io.InputStream; |
| import java.io.DataInputStream; |
| import java.io.FileInputStream; |
| import java.net.URL; |
| import java.nio.ByteBuffer; |
| |
| public class AUReader extends AudioFileReader |
| { |
| private static class AUHeader |
| { |
| // Magic number identifying the file. '.snd' |
| private static final int MAGIC = 0x2e736e64; |
| |
| public static final int SIZE = 24; // size of the header |
| |
| // Encoding types |
| public static final int ULAW = 1; // 8-bit u-law |
| public static final int PCM8 = 2; // 8-bit PCM |
| public static final int PCM16 = 3; // 16-bit PCM |
| public static final int PCM24 = 4; // 24-bit PCM |
| public static final int PCM32 = 5; // 32-bit PCM |
| public static final int IEEE32 = 6; // 32-bit IEEE f.p. |
| public static final int IEEE64 = 7; // 64-bit IEEE f.p. |
| public static final int G721 = 23; |
| public static final int G722 = 24; |
| public static final int G723 = 25; |
| public static final int G723_5BIT = 26; |
| public static final int ALAW = 27; // 8-bit a-law |
| |
| // Header data. |
| public int headerSize; |
| public int fileSize; // this value may not be set. |
| public int encoding; |
| public int sampleRate; |
| public int channels; |
| public int sampleSizeInBits; |
| |
| public AUHeader(InputStream stream) |
| throws IOException, UnsupportedAudioFileException |
| { |
| byte[] hdr = new byte[24]; |
| stream.read( hdr ); |
| ByteBuffer buf = ByteBuffer.wrap(hdr); |
| |
| if( buf.getInt() != MAGIC ) |
| throw new UnsupportedAudioFileException("Not an AU format audio file."); |
| headerSize = buf.getInt(); |
| fileSize = buf.getInt(); |
| encoding = buf.getInt(); |
| sampleRate = buf.getInt(); |
| channels = buf.getInt(); |
| |
| switch(encoding) |
| { |
| case ULAW: |
| case PCM8: |
| case ALAW: |
| sampleSizeInBits = 8; |
| break; |
| case PCM16: |
| sampleSizeInBits = 16; |
| break; |
| case PCM24: |
| sampleSizeInBits = 24; |
| break; |
| case PCM32: |
| sampleSizeInBits = 32; |
| break; |
| default: // other types exist but are not supported. Yet. |
| throw new UnsupportedAudioFileException("Unsupported encoding."); |
| } |
| } |
| |
| public AudioFormat getAudioFormat() |
| { |
| AudioFormat.Encoding encType = AudioFormat.Encoding.PCM_SIGNED; |
| if(encoding == 1) |
| encType = AudioFormat.Encoding.ULAW; |
| if(encoding == 27) |
| encType = AudioFormat.Encoding.ALAW; |
| |
| return new AudioFormat(encType, |
| (float)sampleRate, |
| sampleSizeInBits, |
| channels, |
| (sampleSizeInBits >> 3) * channels, |
| (float)sampleRate, |
| true); |
| } |
| |
| public AudioFileFormat getAudioFileFormat() |
| { |
| return new AudioFileFormat(new AUFormatType(), |
| getAudioFormat(), |
| AudioSystem.NOT_SPECIFIED); |
| } |
| } |
| |
| public static class AUFormatType extends AudioFileFormat.Type |
| { |
| public AUFormatType() |
| { |
| super("AU", ".au"); |
| } |
| } |
| |
| public AudioFileFormat getAudioFileFormat(File file) |
| throws IOException, UnsupportedAudioFileException |
| { |
| return getAudioFileFormat(new FileInputStream(file)); |
| } |
| |
| public AudioFileFormat getAudioFileFormat(InputStream stream) |
| throws IOException, UnsupportedAudioFileException |
| { |
| if(!stream.markSupported()) |
| throw new IOException("Stream must support marking."); |
| |
| stream.mark(25); |
| AUHeader header = new AUHeader(stream); |
| stream.reset(); |
| |
| return header.getAudioFileFormat(); |
| } |
| |
| public AudioFileFormat getAudioFileFormat(URL url) |
| throws IOException, UnsupportedAudioFileException |
| { |
| return getAudioFileFormat(new BufferedInputStream(url.openStream())); |
| } |
| |
| public AudioInputStream getAudioInputStream(File file) |
| throws IOException, UnsupportedAudioFileException |
| { |
| InputStream stream = new FileInputStream(file); |
| long length = file.length(); |
| |
| AUHeader header = new AUHeader( stream ); |
| if( header.headerSize > AUHeader.SIZE ) |
| stream.skip(header.headerSize - AUHeader.SIZE); |
| |
| length -= header.headerSize; |
| |
| return new AudioInputStream(stream, header.getAudioFormat(), length); |
| } |
| |
| public AudioInputStream getAudioInputStream(InputStream stream) |
| throws IOException, UnsupportedAudioFileException |
| { |
| AUHeader header = new AUHeader( stream ); |
| if( header.headerSize > AUHeader.SIZE ) |
| stream.skip(header.headerSize - AUHeader.SIZE); |
| |
| return new AudioInputStream(stream, header.getAudioFormat(), |
| AudioSystem.NOT_SPECIFIED); |
| } |
| |
| public AudioInputStream getAudioInputStream(URL url) |
| throws IOException, UnsupportedAudioFileException |
| { |
| return getAudioInputStream(new BufferedInputStream(url.openStream())); |
| } |
| } |
| |