author | darcy |
Mon, 05 May 2014 23:19:00 -0700 | |
changeset 24548 | 9c007a986347 |
parent 22584 | eed64ee05369 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 1999, 2014, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. Oracle designates this |
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* particular file as subject to the "Classpath" exception as provided |
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* by Oracle in the LICENSE file that accompanied this code. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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*/ |
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package com.sun.media.sound; |
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import java.io.IOException; |
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import java.util.Vector; |
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import javax.sound.sampled.AudioFormat; |
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import javax.sound.sampled.AudioInputStream; |
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import javax.sound.sampled.AudioSystem; |
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/** |
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* A-law encodes linear data, and decodes a-law data to linear data. |
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* |
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* @author Kara Kytle |
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*/ |
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public final class AlawCodec extends SunCodec { |
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/* Tables used for A-law decoding */ |
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private static final byte[] ALAW_TABH = new byte[256]; |
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private static final byte[] ALAW_TABL = new byte[256]; |
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private static final AudioFormat.Encoding[] alawEncodings = { AudioFormat.Encoding.ALAW, AudioFormat.Encoding.PCM_SIGNED }; |
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private static final short seg_end [] = {0xFF, 0x1FF, 0x3FF, |
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0x7FF, 0xFFF, 0x1FFF, 0x3FFF, 0x7FFF}; |
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/** |
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* Initializes the decode tables |
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*/ |
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static { |
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for (int i=0;i<256;i++) { |
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int input = i ^ 0x55; |
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int mantissa = (input & 0xf ) << 4; |
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int segment = (input & 0x70) >> 4; |
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int value = mantissa+8; |
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if(segment>=1) |
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value+=0x100; |
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if(segment>1) |
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value <<= (segment -1); |
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if( (input & 0x80)==0 ) |
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value = -value; |
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ALAW_TABL[i] = (byte)value; |
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ALAW_TABH[i] = (byte)(value>>8); |
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} |
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} |
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/** |
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* Constructs a new ALAW codec object. |
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*/ |
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public AlawCodec() { |
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super(alawEncodings, alawEncodings); |
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} |
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// NEW CODE |
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/** |
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*/ |
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public AudioFormat.Encoding[] getTargetEncodings(AudioFormat sourceFormat){ |
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if( sourceFormat.getEncoding().equals( AudioFormat.Encoding.PCM_SIGNED )) { |
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if( sourceFormat.getSampleSizeInBits() == 16 ) { |
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AudioFormat.Encoding enc[] = new AudioFormat.Encoding[1]; |
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enc[0] = AudioFormat.Encoding.ALAW; |
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return enc; |
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} else { |
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return new AudioFormat.Encoding[0]; |
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} |
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} else if( sourceFormat.getEncoding().equals( AudioFormat.Encoding.ALAW ) ) { |
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if( sourceFormat.getSampleSizeInBits() == 8 ) { |
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AudioFormat.Encoding enc[] = new AudioFormat.Encoding[1]; |
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enc[0] = AudioFormat.Encoding.PCM_SIGNED; |
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return enc; |
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} else { |
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return new AudioFormat.Encoding[0]; |
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} |
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} else { |
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return new AudioFormat.Encoding[0]; |
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} |
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} |
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/** |
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*/ |
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public AudioFormat[] getTargetFormats(AudioFormat.Encoding targetEncoding, AudioFormat sourceFormat){ |
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if( (targetEncoding.equals( AudioFormat.Encoding.PCM_SIGNED ) && sourceFormat.getEncoding().equals( AudioFormat.Encoding.ALAW)) || |
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(targetEncoding.equals( AudioFormat.Encoding.ALAW) && sourceFormat.getEncoding().equals( AudioFormat.Encoding.PCM_SIGNED)) ) { |
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return getOutputFormats( sourceFormat ); |
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} else { |
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return new AudioFormat[0]; |
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} |
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} |
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/** |
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*/ |
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public AudioInputStream getAudioInputStream(AudioFormat.Encoding targetEncoding, AudioInputStream sourceStream){ |
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AudioFormat sourceFormat = sourceStream.getFormat(); |
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AudioFormat.Encoding sourceEncoding = sourceFormat.getEncoding(); |
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if( sourceEncoding.equals( targetEncoding ) ) { |
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return sourceStream; |
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} else { |
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AudioFormat targetFormat = null; |
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if( !isConversionSupported(targetEncoding,sourceStream.getFormat()) ) { |
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throw new IllegalArgumentException("Unsupported conversion: " + sourceStream.getFormat().toString() + " to " + targetEncoding.toString()); |
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} |
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if( sourceEncoding.equals( AudioFormat.Encoding.ALAW ) && |
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targetEncoding.equals( AudioFormat.Encoding.PCM_SIGNED ) ) { |
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targetFormat = new AudioFormat( targetEncoding, |
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sourceFormat.getSampleRate(), |
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16, |
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sourceFormat.getChannels(), |
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2*sourceFormat.getChannels(), |
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sourceFormat.getSampleRate(), |
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sourceFormat.isBigEndian()); |
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} else if( sourceEncoding.equals( AudioFormat.Encoding.PCM_SIGNED ) && |
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targetEncoding.equals( AudioFormat.Encoding.ALAW ) ) { |
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targetFormat = new AudioFormat( targetEncoding, |
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sourceFormat.getSampleRate(), |
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8, |
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sourceFormat.getChannels(), |
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sourceFormat.getChannels(), |
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sourceFormat.getSampleRate(), |
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false); |
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} else { |
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throw new IllegalArgumentException("Unsupported conversion: " + sourceStream.getFormat().toString() + " to " + targetEncoding.toString()); |
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} |
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return getAudioInputStream( targetFormat, sourceStream ); |
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} |
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} |
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/** |
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* use old code... |
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*/ |
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public AudioInputStream getAudioInputStream(AudioFormat targetFormat, AudioInputStream sourceStream){ |
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return getConvertedStream( targetFormat, sourceStream ); |
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} |
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// OLD CODE |
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/** |
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* Opens the codec with the specified parameters. |
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* @param stream stream from which data to be processed should be read |
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* @param outputFormat desired data format of the stream after processing |
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* @return stream from which processed data may be read |
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* @throws IllegalArgumentException if the format combination supplied is |
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* not supported. |
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*/ |
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/* public AudioInputStream getConvertedStream(AudioFormat outputFormat, AudioInputStream stream) { */ |
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private AudioInputStream getConvertedStream(AudioFormat outputFormat, AudioInputStream stream) { |
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AudioInputStream cs = null; |
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AudioFormat inputFormat = stream.getFormat(); |
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if( inputFormat.matches(outputFormat) ) { |
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cs = stream; |
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} else { |
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cs = (AudioInputStream) (new AlawCodecStream(stream, outputFormat)); |
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} |
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return cs; |
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} |
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/** |
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* Obtains the set of output formats supported by the codec |
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* given a particular input format. |
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* If no output formats are supported for this input format, |
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* returns an array of length 0. |
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* @return array of supported output formats. |
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*/ |
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/* public AudioFormat[] getOutputFormats(AudioFormat inputFormat) { */ |
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private AudioFormat[] getOutputFormats(AudioFormat inputFormat) { |
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Vector<AudioFormat> formats = new Vector<>(); |
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AudioFormat format; |
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if ( AudioFormat.Encoding.PCM_SIGNED.equals(inputFormat.getEncoding())) { |
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format = new AudioFormat(AudioFormat.Encoding.ALAW, |
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inputFormat.getSampleRate(), |
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8, |
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inputFormat.getChannels(), |
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inputFormat.getChannels(), |
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inputFormat.getSampleRate(), |
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false ); |
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formats.addElement(format); |
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} |
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if (AudioFormat.Encoding.ALAW.equals(inputFormat.getEncoding())) { |
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format = new AudioFormat(AudioFormat.Encoding.PCM_SIGNED, |
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inputFormat.getSampleRate(), |
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16, |
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inputFormat.getChannels(), |
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inputFormat.getChannels()*2, |
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inputFormat.getSampleRate(), |
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false ); |
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formats.addElement(format); |
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format = new AudioFormat(AudioFormat.Encoding.PCM_SIGNED, |
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inputFormat.getSampleRate(), |
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16, |
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inputFormat.getChannels(), |
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inputFormat.getChannels()*2, |
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inputFormat.getSampleRate(), |
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true ); |
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formats.addElement(format); |
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} |
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AudioFormat[] formatArray = new AudioFormat[formats.size()]; |
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for (int i = 0; i < formatArray.length; i++) { |
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formatArray[i] = formats.elementAt(i); |
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} |
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return formatArray; |
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} |
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final class AlawCodecStream extends AudioInputStream { |
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// tempBuffer required only for encoding (when encode is true) |
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private static final int tempBufferSize = 64; |
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private byte tempBuffer [] = null; |
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/** |
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* True to encode to a-law, false to decode to linear |
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*/ |
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boolean encode = false; |
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AudioFormat encodeFormat; |
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AudioFormat decodeFormat; |
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byte tabByte1[] = null; |
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byte tabByte2[] = null; |
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int highByte = 0; |
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int lowByte = 1; |
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AlawCodecStream(AudioInputStream stream, AudioFormat outputFormat) { |
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super(stream, outputFormat, -1); |
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AudioFormat inputFormat = stream.getFormat(); |
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// throw an IllegalArgumentException if not ok |
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if ( ! (isConversionSupported(outputFormat, inputFormat)) ) { |
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throw new IllegalArgumentException("Unsupported conversion: " + inputFormat.toString() + " to " + outputFormat.toString()); |
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} |
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//$$fb 2002-07-18: fix for 4714846: JavaSound ULAW (8-bit) encoder erroneously depends on endian-ness |
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boolean PCMIsBigEndian; |
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// determine whether we are encoding or decoding |
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if (AudioFormat.Encoding.ALAW.equals(inputFormat.getEncoding())) { |
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encode = false; |
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encodeFormat = inputFormat; |
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decodeFormat = outputFormat; |
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PCMIsBigEndian = outputFormat.isBigEndian(); |
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} else { |
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encode = true; |
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encodeFormat = outputFormat; |
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decodeFormat = inputFormat; |
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PCMIsBigEndian = inputFormat.isBigEndian(); |
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parents:
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diff
changeset
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tempBuffer = new byte[tempBufferSize]; |
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} |
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if (PCMIsBigEndian) { |
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tabByte1 = ALAW_TABH; |
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tabByte2 = ALAW_TABL; |
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highByte = 0; |
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lowByte = 1; |
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} else { |
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tabByte1 = ALAW_TABL; |
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tabByte2 = ALAW_TABH; |
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highByte = 1; |
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lowByte = 0; |
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} |
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// set the AudioInputStream length in frames if we know it |
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if (stream instanceof AudioInputStream) { |
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frameLength = stream.getFrameLength(); |
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} |
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// set framePos to zero |
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framePos = 0; |
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frameSize = inputFormat.getFrameSize(); |
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if( frameSize==AudioSystem.NOT_SPECIFIED ) { |
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frameSize=1; |
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} |
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} |
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/* |
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* $$jb 2/23/99 |
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* Used to determine segment number in aLaw encoding |
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*/ |
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private short search(short val, short table[], short size) { |
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for(short i = 0; i < size; i++) { |
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if (val <= table[i]) { return i; } |
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} |
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return size; |
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} |
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342 |
/** |
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* Note that this won't actually read anything; must read in |
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* two-byte units. |
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*/ |
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public int read() throws IOException { |
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347 |
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byte[] b = new byte[1]; |
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return read(b, 0, b.length); |
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} |
351 |
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public int read(byte[] b) throws IOException { |
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return read(b, 0, b.length); |
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} |
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357 |
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358 |
public int read(byte[] b, int off, int len) throws IOException { |
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359 |
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// don't read fractional frames |
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361 |
if( len%frameSize != 0 ) { |
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len -= (len%frameSize); |
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} |
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364 |
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365 |
if (encode) { |
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366 |
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367 |
short QUANT_MASK = 0xF; |
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short SEG_SHIFT = 4; |
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short mask; |
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370 |
short seg; |
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371 |
int adj; |
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372 |
int i; |
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373 |
||
374 |
short sample; |
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375 |
byte enc; |
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376 |
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377 |
int readCount = 0; |
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378 |
int currentPos = off; |
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379 |
int readLeft = len*2; |
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380 |
int readLen = ( (readLeft>tempBufferSize) ? tempBufferSize : readLeft ); |
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381 |
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382 |
while ((readCount = super.read(tempBuffer,0,readLen))>0) { |
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383 |
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384 |
for (i = 0; i < readCount; i+=2) { |
|
385 |
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386 |
/* Get the sample from the tempBuffer */ |
|
387 |
sample = (short)(( (tempBuffer[i + highByte]) << 8) & 0xFF00); |
|
388 |
sample |= (short)( (tempBuffer[i + lowByte]) & 0xFF); |
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389 |
||
390 |
if(sample >= 0) { |
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391 |
mask = 0xD5; |
|
392 |
} else { |
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393 |
mask = 0x55; |
|
394 |
sample = (short)(-sample - 8); |
|
395 |
} |
|
396 |
/* Convert the scaled magnitude to segment number. */ |
|
397 |
seg = search(sample, seg_end, (short) 8); |
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398 |
/* |
|
399 |
* Combine the sign, segment, quantization bits |
|
400 |
*/ |
|
401 |
if (seg >= 8) { /* out of range, return maximum value. */ |
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402 |
enc = (byte) (0x7F ^ mask); |
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403 |
} else { |
|
404 |
enc = (byte) (seg << SEG_SHIFT); |
|
405 |
if(seg < 2) { |
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406 |
enc |= (byte) ( (sample >> 4) & QUANT_MASK); |
|
407 |
} else { |
|
408 |
enc |= (byte) ( (sample >> (seg + 3)) & QUANT_MASK ); |
|
409 |
} |
|
410 |
enc ^= mask; |
|
411 |
} |
|
412 |
/* Now put the encoded sample where it belongs */ |
|
413 |
b[currentPos] = enc; |
|
414 |
currentPos++; |
|
415 |
} |
|
416 |
/* And update pointers and counters for next iteration */ |
|
417 |
readLeft -= readCount; |
|
418 |
readLen = ( (readLeft>tempBufferSize) ? tempBufferSize : readLeft ); |
|
419 |
} |
|
420 |
||
421 |
if( currentPos==off && readCount<0 ) { // EOF or error |
|
422 |
return readCount; |
|
423 |
} |
|
424 |
||
425 |
return (currentPos - off); /* Number of bytes written to new buffer */ |
|
426 |
||
427 |
} else { |
|
428 |
||
429 |
int i; |
|
430 |
int readLen = len/2; |
|
431 |
int readOffset = off + len/2; |
|
432 |
int readCount = super.read(b, readOffset, readLen); |
|
433 |
||
434 |
for (i = off; i < (off + (readCount*2)); i+=2) { |
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22584
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8032733: Fix cast lint warnings in client libraries
darcy
parents:
18215
diff
changeset
|
435 |
b[i] = tabByte1[b[readOffset] & 0xFF]; |
eed64ee05369
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darcy
parents:
18215
diff
changeset
|
436 |
b[i+1] = tabByte2[b[readOffset] & 0xFF]; |
2 | 437 |
readOffset++; |
438 |
} |
|
439 |
||
440 |
if( readCount<0 ) { // EOF or error |
|
441 |
return readCount; |
|
442 |
} |
|
443 |
||
444 |
return (i - off); |
|
445 |
} |
|
446 |
} |
|
447 |
} // end class AlawCodecStream |
|
448 |
} // end class ALAW |