jdk-sandbox: comparison jdk/src/share/classes/com/sun/media/sound/UlawCodec.java

equal deleted inserted replaced

-:fd16c54261b3
+:90ce3da70b43
+/*
+* Copyright 1999-2007 Sun Microsystems, Inc.  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.  Sun designates this
+* particular file as subject to the "Classpath" exception as provided
+* by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+* CA 95054 USA or visit www.sun.com if you need additional information or
+* have any questions.
+*/
+package com.sun.media.sound;
+import java.io.InputStream;
+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 class UlawCodec extends SunCodec {
+/* Tables used for U-law decoding */
+final static byte ULAW_TABH[] = new byte[256];
+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 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] = (AudioFormat)(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());
+}
+//$$fb 2002-07-18: fix for 4714846: JavaSound ULAW (8-bit) encoder erroneously depends on endian-ness
+boolean PCMIsBigEndian;
+// determine whether we are encoding or decoding
+if (AudioFormat.Encoding.ULAW.equals(inputFormat.getEncoding())) {
+encode = false;
+encodeFormat = inputFormat;
+decodeFormat = outputFormat;
+PCMIsBigEndian = outputFormat.isBigEndian();
+} else {
+encode = true;
+encodeFormat = outputFormat;
+decodeFormat = inputFormat;
+PCMIsBigEndian = inputFormat.isBigEndian();
+tempBuffer = new byte[tempBufferSize];
+}
+// setup tables according to byte order
+if (PCMIsBigEndian) {
+tabByte1 = ULAW_TABH;
+tabByte2 = ULAW_TABL;
+highByte = 0;
+lowByte  = 1;
+} else {
+tabByte1 = ULAW_TABL;
+tabByte2 = ULAW_TABH;
+highByte = 1;
+lowByte  = 0;
+}
+// set the AudioInputStream length in frames if we know it
+if (stream instanceof AudioInputStream) {
+frameLength = ((AudioInputStream)stream).getFrameLength();
+}
+// set framePos to zero
+framePos = 0;
+frameSize = inputFormat.getFrameSize();
+if (frameSize == AudioSystem.NOT_SPECIFIED) {
+frameSize = 1;
+}
+}
+/*
+* $$jb 2/23/99
+* Used to determine segment number in 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]        = (byte)tabByte1[b[readOffset] & 0xFF];
+b[i+1]      = (byte)tabByte2[b[readOffset] & 0xFF];
+readOffset++;
+}
+return (i - off);
+}
+}
+} // end class UlawCodecStream
+} // end class ULAW

changeset 2	90ce3da70b43
child 5506	202f599c92aa