| /* |
| * Copyright (c) 1999, 2013, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code 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 |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| package com.sun.media.sound; |
| |
| import java.io.IOException; |
| import java.util.Vector; |
| |
| import javax.sound.sampled.AudioFormat; |
| import javax.sound.sampled.AudioInputStream; |
| import javax.sound.sampled.AudioSystem; |
| |
| |
| /** |
| * A-law encodes linear data, and decodes a-law data to linear data. |
| * |
| * @author Kara Kytle |
| */ |
| public final class AlawCodec extends SunCodec { |
| |
| /* Tables used for A-law decoding */ |
| |
| private static final byte[] ALAW_TABH = new byte[256]; |
| private static final byte[] ALAW_TABL = new byte[256]; |
| |
| private static final AudioFormat.Encoding[] alawEncodings = { AudioFormat.Encoding.ALAW, AudioFormat.Encoding.PCM_SIGNED }; |
| |
| private static final short seg_end [] = {0xFF, 0x1FF, 0x3FF, |
| 0x7FF, 0xFFF, 0x1FFF, 0x3FFF, 0x7FFF}; |
| |
| /** |
| * Initializes the decode tables |
| */ |
| static { |
| for (int i=0;i<256;i++) { |
| int input = i ^ 0x55; |
| int mantissa = (input & 0xf ) << 4; |
| int segment = (input & 0x70) >> 4; |
| int value = mantissa+8; |
| |
| if(segment>=1) |
| value+=0x100; |
| if(segment>1) |
| value <<= (segment -1); |
| |
| if( (input & 0x80)==0 ) |
| value = -value; |
| |
| ALAW_TABL[i] = (byte)value; |
| ALAW_TABH[i] = (byte)(value>>8); |
| } |
| } |
| |
| |
| /** |
| * Constructs a new ALAW codec object. |
| */ |
| public AlawCodec() { |
| |
| super(alawEncodings, alawEncodings); |
| } |
| |
| // NEW CODE |
| |
| /** |
| */ |
| public AudioFormat.Encoding[] getTargetEncodings(AudioFormat sourceFormat){ |
| |
| if( sourceFormat.getEncoding().equals( AudioFormat.Encoding.PCM_SIGNED )) { |
| |
| if( sourceFormat.getSampleSizeInBits() == 16 ) { |
| |
| AudioFormat.Encoding enc[] = new AudioFormat.Encoding[1]; |
| enc[0] = AudioFormat.Encoding.ALAW; |
| return enc; |
| |
| } else { |
| return new AudioFormat.Encoding[0]; |
| } |
| } else if( sourceFormat.getEncoding().equals( AudioFormat.Encoding.ALAW ) ) { |
| |
| if( sourceFormat.getSampleSizeInBits() == 8 ) { |
| |
| AudioFormat.Encoding enc[] = new AudioFormat.Encoding[1]; |
| enc[0] = AudioFormat.Encoding.PCM_SIGNED; |
| return enc; |
| |
| } else { |
| return new AudioFormat.Encoding[0]; |
| } |
| |
| } else { |
| return new AudioFormat.Encoding[0]; |
| } |
| } |
| |
| /** |
| */ |
| public AudioFormat[] getTargetFormats(AudioFormat.Encoding targetEncoding, AudioFormat sourceFormat){ |
| if( (targetEncoding.equals( AudioFormat.Encoding.PCM_SIGNED ) && sourceFormat.getEncoding().equals( AudioFormat.Encoding.ALAW)) || |
| (targetEncoding.equals( AudioFormat.Encoding.ALAW) && sourceFormat.getEncoding().equals( AudioFormat.Encoding.PCM_SIGNED)) ) { |
| return getOutputFormats( sourceFormat ); |
| } else { |
| return new AudioFormat[0]; |
| } |
| } |
| |
| /** |
| */ |
| public AudioInputStream getAudioInputStream(AudioFormat.Encoding targetEncoding, AudioInputStream sourceStream){ |
| AudioFormat sourceFormat = sourceStream.getFormat(); |
| AudioFormat.Encoding sourceEncoding = sourceFormat.getEncoding(); |
| |
| if( sourceEncoding.equals( targetEncoding ) ) { |
| return sourceStream; |
| } else { |
| AudioFormat targetFormat = null; |
| if( !isConversionSupported(targetEncoding,sourceStream.getFormat()) ) { |
| throw new IllegalArgumentException("Unsupported conversion: " + sourceStream.getFormat().toString() + " to " + targetEncoding.toString()); |
| } |
| if( sourceEncoding.equals( AudioFormat.Encoding.ALAW ) && |
| targetEncoding.equals( AudioFormat.Encoding.PCM_SIGNED ) ) { |
| |
| targetFormat = new AudioFormat( targetEncoding, |
| sourceFormat.getSampleRate(), |
| 16, |
| sourceFormat.getChannels(), |
| 2*sourceFormat.getChannels(), |
| sourceFormat.getSampleRate(), |
| sourceFormat.isBigEndian()); |
| |
| } else if( sourceEncoding.equals( AudioFormat.Encoding.PCM_SIGNED ) && |
| targetEncoding.equals( AudioFormat.Encoding.ALAW ) ) { |
| |
| targetFormat = new AudioFormat( targetEncoding, |
| sourceFormat.getSampleRate(), |
| 8, |
| sourceFormat.getChannels(), |
| sourceFormat.getChannels(), |
| sourceFormat.getSampleRate(), |
| false); |
| } else { |
| throw new IllegalArgumentException("Unsupported conversion: " + sourceStream.getFormat().toString() + " to " + targetEncoding.toString()); |
| } |
| return getAudioInputStream( targetFormat, sourceStream ); |
| } |
| } |
| |
| /** |
| * use old code... |
| */ |
| public AudioInputStream getAudioInputStream(AudioFormat targetFormat, AudioInputStream sourceStream){ |
| return getConvertedStream( targetFormat, sourceStream ); |
| } |
| |
| |
| // OLD CODE |
| |
| |
| /** |
| * Opens the codec with the specified parameters. |
| * @param stream stream from which data to be processed should be read |
| * @param outputFormat desired data format of the stream after processing |
| * @return stream from which processed data may be read |
| * @throws IllegalArgumentException if the format combination supplied is |
| * not supported. |
| */ |
| /* public AudioInputStream getConvertedStream(AudioFormat outputFormat, AudioInputStream stream) { */ |
| private AudioInputStream getConvertedStream(AudioFormat outputFormat, AudioInputStream stream) { |
| |
| AudioInputStream cs = null; |
| AudioFormat inputFormat = stream.getFormat(); |
| |
| if( inputFormat.matches(outputFormat) ) { |
| cs = stream; |
| } else { |
| cs = (AudioInputStream) (new AlawCodecStream(stream, outputFormat)); |
| } |
| |
| return cs; |
| } |
| |
| /** |
| * Obtains the set of output formats supported by the codec |
| * given a particular input format. |
| * If no output formats are supported for this input format, |
| * returns an array of length 0. |
| * @return array of supported output formats. |
| */ |
| /* public AudioFormat[] getOutputFormats(AudioFormat inputFormat) { */ |
| private AudioFormat[] getOutputFormats(AudioFormat inputFormat) { |
| |
| |
| Vector formats = new Vector(); |
| AudioFormat format; |
| |
| if ( AudioFormat.Encoding.PCM_SIGNED.equals(inputFormat.getEncoding())) { |
| format = new AudioFormat(AudioFormat.Encoding.ALAW, |
| inputFormat.getSampleRate(), |
| 8, |
| inputFormat.getChannels(), |
| inputFormat.getChannels(), |
| inputFormat.getSampleRate(), |
| false ); |
| formats.addElement(format); |
| } |
| |
| if (AudioFormat.Encoding.ALAW.equals(inputFormat.getEncoding())) { |
| format = new AudioFormat(AudioFormat.Encoding.PCM_SIGNED, |
| inputFormat.getSampleRate(), |
| 16, |
| inputFormat.getChannels(), |
| inputFormat.getChannels()*2, |
| inputFormat.getSampleRate(), |
| false ); |
| formats.addElement(format); |
| format = new AudioFormat(AudioFormat.Encoding.PCM_SIGNED, |
| inputFormat.getSampleRate(), |
| 16, |
| inputFormat.getChannels(), |
| inputFormat.getChannels()*2, |
| inputFormat.getSampleRate(), |
| true ); |
| formats.addElement(format); |
| } |
| |
| AudioFormat[] formatArray = new AudioFormat[formats.size()]; |
| for (int i = 0; i < formatArray.length; i++) { |
| formatArray[i] = (AudioFormat)(formats.elementAt(i)); |
| } |
| return formatArray; |
| } |
| |
| |
| final class AlawCodecStream extends AudioInputStream { |
| |
| // tempBuffer required only for encoding (when encode is true) |
| private static final int tempBufferSize = 64; |
| private byte tempBuffer [] = null; |
| |
| /** |
| * True to encode to a-law, false to decode to linear |
| */ |
| boolean encode = false; |
| |
| AudioFormat encodeFormat; |
| AudioFormat decodeFormat; |
| |
| byte tabByte1[] = null; |
| byte tabByte2[] = null; |
| int highByte = 0; |
| int lowByte = 1; |
| |
| AlawCodecStream(AudioInputStream stream, AudioFormat outputFormat) { |
| |
| super(stream, outputFormat, -1); |
| |
| AudioFormat inputFormat = stream.getFormat(); |
| |
| // throw an IllegalArgumentException if not ok |
| if ( ! (isConversionSupported(outputFormat, inputFormat)) ) { |
| |
| throw new IllegalArgumentException("Unsupported conversion: " + inputFormat.toString() + " to " + outputFormat.toString()); |
| } |
| |
| //$$fb 2002-07-18: fix for 4714846: JavaSound ULAW (8-bit) encoder erroneously depends on endian-ness |
| boolean PCMIsBigEndian; |
| |
| // determine whether we are encoding or decoding |
| if (AudioFormat.Encoding.ALAW.equals(inputFormat.getEncoding())) { |
| encode = false; |
| encodeFormat = inputFormat; |
| decodeFormat = outputFormat; |
| PCMIsBigEndian = outputFormat.isBigEndian(); |
| } else { |
| encode = true; |
| encodeFormat = outputFormat; |
| decodeFormat = inputFormat; |
| PCMIsBigEndian = inputFormat.isBigEndian(); |
| tempBuffer = new byte[tempBufferSize]; |
| } |
| |
| if (PCMIsBigEndian) { |
| tabByte1 = ALAW_TABH; |
| tabByte2 = ALAW_TABL; |
| highByte = 0; |
| lowByte = 1; |
| } else { |
| tabByte1 = ALAW_TABL; |
| tabByte2 = ALAW_TABH; |
| highByte = 1; |
| lowByte = 0; |
| } |
| |
| // set the AudioInputStream length in frames if we know it |
| if (stream instanceof AudioInputStream) { |
| frameLength = ((AudioInputStream)stream).getFrameLength(); |
| } |
| |
| // set framePos to zero |
| framePos = 0; |
| frameSize = inputFormat.getFrameSize(); |
| if( frameSize==AudioSystem.NOT_SPECIFIED ) { |
| frameSize=1; |
| } |
| } |
| |
| |
| /* |
| * $$jb 2/23/99 |
| * Used to determine segment number in aLaw encoding |
| */ |
| private short search(short val, short table[], short size) { |
| for(short i = 0; i < size; i++) { |
| if (val <= table[i]) { return i; } |
| } |
| return size; |
| } |
| |
| /** |
| * Note that this won't actually read anything; must read in |
| * two-byte units. |
| */ |
| public int read() throws IOException { |
| |
| byte[] b = new byte[1]; |
| return (int)read(b, 0, b.length); |
| } |
| |
| |
| public int read(byte[] b) throws IOException { |
| |
| return read(b, 0, b.length); |
| } |
| |
| public int read(byte[] b, int off, int len) throws IOException { |
| |
| // don't read fractional frames |
| if( len%frameSize != 0 ) { |
| len -= (len%frameSize); |
| } |
| |
| if (encode) { |
| |
| short QUANT_MASK = 0xF; |
| short SEG_SHIFT = 4; |
| short mask; |
| short seg; |
| int adj; |
| int i; |
| |
| short sample; |
| byte enc; |
| |
| int readCount = 0; |
| int currentPos = off; |
| int readLeft = len*2; |
| int readLen = ( (readLeft>tempBufferSize) ? tempBufferSize : readLeft ); |
| |
| while ((readCount = super.read(tempBuffer,0,readLen))>0) { |
| |
| for (i = 0; i < readCount; i+=2) { |
| |
| /* Get the sample from the tempBuffer */ |
| sample = (short)(( (tempBuffer[i + highByte]) << 8) & 0xFF00); |
| sample |= (short)( (tempBuffer[i + lowByte]) & 0xFF); |
| |
| if(sample >= 0) { |
| mask = 0xD5; |
| } else { |
| mask = 0x55; |
| sample = (short)(-sample - 8); |
| } |
| /* Convert the scaled magnitude to segment number. */ |
| seg = search(sample, seg_end, (short) 8); |
| /* |
| * Combine the sign, segment, quantization bits |
| */ |
| if (seg >= 8) { /* out of range, return maximum value. */ |
| enc = (byte) (0x7F ^ mask); |
| } else { |
| enc = (byte) (seg << SEG_SHIFT); |
| if(seg < 2) { |
| enc |= (byte) ( (sample >> 4) & QUANT_MASK); |
| } else { |
| enc |= (byte) ( (sample >> (seg + 3)) & QUANT_MASK ); |
| } |
| enc ^= mask; |
| } |
| /* Now put the encoded sample where it belongs */ |
| b[currentPos] = enc; |
| currentPos++; |
| } |
| /* And update pointers and counters for next iteration */ |
| readLeft -= readCount; |
| readLen = ( (readLeft>tempBufferSize) ? tempBufferSize : readLeft ); |
| } |
| |
| if( currentPos==off && readCount<0 ) { // EOF or error |
| return readCount; |
| } |
| |
| return (currentPos - off); /* Number of bytes written to new buffer */ |
| |
| } else { |
| |
| int i; |
| int readLen = len/2; |
| int readOffset = off + len/2; |
| int readCount = super.read(b, readOffset, readLen); |
| |
| for (i = off; i < (off + (readCount*2)); i+=2) { |
| b[i] = (byte)tabByte1[b[readOffset] & 0xFF]; |
| b[i+1] = (byte)tabByte2[b[readOffset] & 0xFF]; |
| readOffset++; |
| } |
| |
| if( readCount<0 ) { // EOF or error |
| return readCount; |
| } |
| |
| return (i - off); |
| } |
| } |
| } // end class AlawCodecStream |
| } // end class ALAW |
