--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/jdk/src/java.desktop/share/classes/com/sun/media/sound/UlawCodec.java Sun Aug 17 15:54:13 2014 +0100
@@ -0,0 +1,418 @@
+/*
+ * Copyright (c) 1999, 2014, 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.AudioSystem;
+import javax.sound.sampled.AudioInputStream;
+
+
+/**
+ * U-law encodes linear data, and decodes u-law data to linear data.
+ *
+ * @author Kara Kytle
+ */
+public final class UlawCodec extends SunCodec {
+
+ /* Tables used for U-law decoding */
+
+ private final static byte[] ULAW_TABH = new byte[256];
+ private final static byte[] ULAW_TABL = new byte[256];
+
+ private static final AudioFormat.Encoding[] ulawEncodings = {AudioFormat.Encoding.ULAW,
+ 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 ulaw = ~i;
+ int t;
+
+ ulaw &= 0xFF;
+ t = ((ulaw & 0xf)<<3) + 132;
+ t <<= ((ulaw & 0x70) >> 4);
+ t = ( (ulaw&0x80) != 0 ) ? (132-t) : (t-132);
+
+ ULAW_TABL[i] = (byte) (t&0xff);
+ ULAW_TABH[i] = (byte) ((t>>8) & 0xff);
+ }
+ }
+
+
+ /**
+ * Constructs a new ULAW codec object.
+ */
+ public UlawCodec() {
+ super(ulawEncodings, ulawEncodings);
+ }
+
+ /**
+ */
+ public AudioFormat.Encoding[] getTargetEncodings(AudioFormat sourceFormat){
+ if( AudioFormat.Encoding.PCM_SIGNED.equals(sourceFormat.getEncoding()) ) {
+ if( sourceFormat.getSampleSizeInBits() == 16 ) {
+ AudioFormat.Encoding enc[] = new AudioFormat.Encoding[1];
+ enc[0] = AudioFormat.Encoding.ULAW;
+ return enc;
+ } else {
+ return new AudioFormat.Encoding[0];
+ }
+ } else if (AudioFormat.Encoding.ULAW.equals(sourceFormat.getEncoding())) {
+ 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( (AudioFormat.Encoding.PCM_SIGNED.equals(targetEncoding)
+ && AudioFormat.Encoding.ULAW.equals(sourceFormat.getEncoding()))
+ ||
+ (AudioFormat.Encoding.ULAW.equals(targetEncoding)
+ && AudioFormat.Encoding.PCM_SIGNED.equals(sourceFormat.getEncoding()))) {
+ 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 (AudioFormat.Encoding.ULAW.equals(sourceEncoding) &&
+ AudioFormat.Encoding.PCM_SIGNED.equals(targetEncoding) ) {
+ targetFormat = new AudioFormat( targetEncoding,
+ sourceFormat.getSampleRate(),
+ 16,
+ sourceFormat.getChannels(),
+ 2*sourceFormat.getChannels(),
+ sourceFormat.getSampleRate(),
+ sourceFormat.isBigEndian());
+ } else if (AudioFormat.Encoding.PCM_SIGNED.equals(sourceEncoding) &&
+ AudioFormat.Encoding.ULAW.equals(targetEncoding)) {
+ 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 UlawCodecStream(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<AudioFormat> formats = new Vector<>();
+ AudioFormat format;
+
+ if ((inputFormat.getSampleSizeInBits() == 16)
+ && AudioFormat.Encoding.PCM_SIGNED.equals(inputFormat.getEncoding())) {
+ format = new AudioFormat(AudioFormat.Encoding.ULAW,
+ inputFormat.getSampleRate(),
+ 8,
+ inputFormat.getChannels(),
+ inputFormat.getChannels(),
+ inputFormat.getSampleRate(),
+ false );
+ formats.addElement(format);
+ }
+
+ if (AudioFormat.Encoding.ULAW.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] = formats.elementAt(i);
+ }
+ return formatArray;
+ }
+
+
+ class UlawCodecStream extends AudioInputStream {
+
+ private static final int tempBufferSize = 64;
+ private byte tempBuffer [] = null;
+
+ /**
+ * True to encode to u-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;
+
+ UlawCodecStream(AudioInputStream stream, AudioFormat outputFormat) {
+ super(stream, outputFormat, AudioSystem.NOT_SPECIFIED);
+
+ AudioFormat inputFormat = stream.getFormat();
+
+ // throw an IllegalArgumentException if not ok
+ if (!(isConversionSupported(outputFormat, inputFormat))) {
+ throw new IllegalArgumentException("Unsupported conversion: " + inputFormat.toString() + " to " + outputFormat.toString());
+ }
+
+ //$$fb 2002-07-18: fix for 4714846: JavaSound ULAW (8-bit) encoder erroneously depends on endian-ness
+ boolean PCMIsBigEndian;
+
+ // determine whether we are encoding or decoding
+ if (AudioFormat.Encoding.ULAW.equals(inputFormat.getEncoding())) {
+ encode = false;
+ encodeFormat = inputFormat;
+ decodeFormat = outputFormat;
+ PCMIsBigEndian = outputFormat.isBigEndian();
+ } else {
+ encode = true;
+ encodeFormat = outputFormat;
+ decodeFormat = inputFormat;
+ PCMIsBigEndian = inputFormat.isBigEndian();
+ tempBuffer = new byte[tempBufferSize];
+ }
+
+ // setup tables according to byte order
+ if (PCMIsBigEndian) {
+ tabByte1 = ULAW_TABH;
+ tabByte2 = ULAW_TABL;
+ highByte = 0;
+ lowByte = 1;
+ } else {
+ tabByte1 = ULAW_TABL;
+ tabByte2 = ULAW_TABH;
+ highByte = 1;
+ lowByte = 0;
+ }
+
+ // set the AudioInputStream length in frames if we know it
+ if (stream instanceof AudioInputStream) {
+ frameLength = stream.getFrameLength();
+ }
+ // set framePos to zero
+ framePos = 0;
+ frameSize = inputFormat.getFrameSize();
+ if (frameSize == AudioSystem.NOT_SPECIFIED) {
+ frameSize = 1;
+ }
+ }
+
+
+ /*
+ * $$jb 2/23/99
+ * Used to determine segment number in uLaw 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];
+ if (read(b, 0, b.length) == 1) {
+ return b[1] & 0xFF;
+ }
+ return -1;
+ }
+
+ 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 BIAS = 0x84;
+ short mask;
+ short seg;
+ 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)( (short) (tempBuffer[i + lowByte]) & 0xFF);
+
+ /* Get the sign and the magnitude of the value. */
+ if(sample < 0) {
+ sample = (short) (BIAS - sample);
+ mask = 0x7F;
+ } else {
+ sample += BIAS;
+ mask = 0xFF;
+ }
+ /* Convert the scaled magnitude to segment number. */
+ seg = search(sample, seg_end, (short) 8);
+ /*
+ * Combine the sign, segment, quantization bits;
+ * and complement the code word.
+ */
+ if (seg >= 8) { /* out of range, return maximum value. */
+ enc = (byte) (0x7F ^ mask);
+ } else {
+ enc = (byte) ((seg << 4) | ((sample >> (seg+3)) & 0xF));
+ 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 on read
+ 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);
+
+ if(readCount<0) { // EOF or error
+ return readCount;
+ }
+ for (i = off; i < (off + (readCount*2)); i+=2) {
+ b[i] = tabByte1[b[readOffset] & 0xFF];
+ b[i+1] = tabByte2[b[readOffset] & 0xFF];
+ readOffset++;
+ }
+ return (i - off);
+ }
+ }
+ } // end class UlawCodecStream
+
+} // end class ULAW