1 /* 2 * Copyright (c) 1999, 2014, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26 package com.sun.media.sound; 27 28 import java.io.IOException; 29 30 import java.util.Vector; 31 32 import javax.sound.sampled.AudioFormat; 33 import javax.sound.sampled.AudioSystem; 34 import javax.sound.sampled.AudioInputStream; 35 36 37 /** 38 * U-law encodes linear data, and decodes u-law data to linear data. 39 * 40 * @author Kara Kytle 41 */ 42 public final class UlawCodec extends SunCodec { 43 44 /* Tables used for U-law decoding */ 45 46 private final static byte[] ULAW_TABH = new byte[256]; 47 private final static byte[] ULAW_TABL = new byte[256]; 48 49 private static final AudioFormat.Encoding[] ulawEncodings = {AudioFormat.Encoding.ULAW, 50 AudioFormat.Encoding.PCM_SIGNED}; 51 52 private static final short seg_end [] = {0xFF, 0x1FF, 0x3FF, 53 0x7FF, 0xFFF, 0x1FFF, 0x3FFF, 0x7FFF}; 54 55 /** 56 * Initializes the decode tables 57 */ 58 static { 59 for (int i=0;i<256;i++) { 60 int ulaw = ~i; 61 int t; 62 63 ulaw &= 0xFF; 64 t = ((ulaw & 0xf)<<3) + 132; 65 t <<= ((ulaw & 0x70) >> 4); 66 t = ( (ulaw&0x80) != 0 ) ? (132-t) : (t-132); 67 68 ULAW_TABL[i] = (byte) (t&0xff); 69 ULAW_TABH[i] = (byte) ((t>>8) & 0xff); 70 } 71 } 72 73 74 /** 75 * Constructs a new ULAW codec object. 76 */ 77 public UlawCodec() { 78 super(ulawEncodings, ulawEncodings); 79 } 80 81 /** 82 */ 83 public AudioFormat.Encoding[] getTargetEncodings(AudioFormat sourceFormat){ 84 if( AudioFormat.Encoding.PCM_SIGNED.equals(sourceFormat.getEncoding()) ) { 85 if( sourceFormat.getSampleSizeInBits() == 16 ) { 86 AudioFormat.Encoding enc[] = new AudioFormat.Encoding[1]; 87 enc[0] = AudioFormat.Encoding.ULAW; 88 return enc; 89 } else { 90 return new AudioFormat.Encoding[0]; 91 } 92 } else if (AudioFormat.Encoding.ULAW.equals(sourceFormat.getEncoding())) { 93 if (sourceFormat.getSampleSizeInBits() == 8) { 94 AudioFormat.Encoding enc[] = new AudioFormat.Encoding[1]; 95 enc[0] = AudioFormat.Encoding.PCM_SIGNED; 96 return enc; 97 } else { 98 return new AudioFormat.Encoding[0]; 99 } 100 } else { 101 return new AudioFormat.Encoding[0]; 102 } 103 } 104 105 106 /** 107 */ 108 public AudioFormat[] getTargetFormats(AudioFormat.Encoding targetEncoding, AudioFormat sourceFormat){ 109 if( (AudioFormat.Encoding.PCM_SIGNED.equals(targetEncoding) 110 && AudioFormat.Encoding.ULAW.equals(sourceFormat.getEncoding())) 111 || 112 (AudioFormat.Encoding.ULAW.equals(targetEncoding) 113 && AudioFormat.Encoding.PCM_SIGNED.equals(sourceFormat.getEncoding()))) { 114 return getOutputFormats(sourceFormat); 115 } else { 116 return new AudioFormat[0]; 117 } 118 } 119 120 /** 121 */ 122 public AudioInputStream getAudioInputStream(AudioFormat.Encoding targetEncoding, AudioInputStream sourceStream){ 123 AudioFormat sourceFormat = sourceStream.getFormat(); 124 AudioFormat.Encoding sourceEncoding = sourceFormat.getEncoding(); 125 126 if (sourceEncoding.equals(targetEncoding)) { 127 return sourceStream; 128 } else { 129 AudioFormat targetFormat = null; 130 if (!isConversionSupported(targetEncoding,sourceStream.getFormat())) { 131 throw new IllegalArgumentException("Unsupported conversion: " + sourceStream.getFormat().toString() + " to " + targetEncoding.toString()); 132 } 133 if (AudioFormat.Encoding.ULAW.equals(sourceEncoding) && 134 AudioFormat.Encoding.PCM_SIGNED.equals(targetEncoding) ) { 135 targetFormat = new AudioFormat( targetEncoding, 136 sourceFormat.getSampleRate(), 137 16, 138 sourceFormat.getChannels(), 139 2*sourceFormat.getChannels(), 140 sourceFormat.getSampleRate(), 141 sourceFormat.isBigEndian()); 142 } else if (AudioFormat.Encoding.PCM_SIGNED.equals(sourceEncoding) && 143 AudioFormat.Encoding.ULAW.equals(targetEncoding)) { 144 targetFormat = new AudioFormat( targetEncoding, 145 sourceFormat.getSampleRate(), 146 8, 147 sourceFormat.getChannels(), 148 sourceFormat.getChannels(), 149 sourceFormat.getSampleRate(), 150 false); 151 } else { 152 throw new IllegalArgumentException("Unsupported conversion: " + sourceStream.getFormat().toString() + " to " + targetEncoding.toString()); 153 } 154 155 return getAudioInputStream( targetFormat, sourceStream ); 156 } 157 } 158 159 /** 160 * use old code... 161 */ 162 public AudioInputStream getAudioInputStream(AudioFormat targetFormat, AudioInputStream sourceStream){ 163 return getConvertedStream(targetFormat, sourceStream); 164 } 165 166 167 // OLD CODE 168 169 /** 170 * Opens the codec with the specified parameters. 171 * @param stream stream from which data to be processed should be read 172 * @param outputFormat desired data format of the stream after processing 173 * @return stream from which processed data may be read 174 * @throws IllegalArgumentException if the format combination supplied is 175 * not supported. 176 */ 177 /* public AudioInputStream getConvertedStream(AudioFormat outputFormat, AudioInputStream stream) { */ 178 private AudioInputStream getConvertedStream(AudioFormat outputFormat, AudioInputStream stream) { 179 AudioInputStream cs = null; 180 181 AudioFormat inputFormat = stream.getFormat(); 182 183 if( inputFormat.matches(outputFormat) ) { 184 cs = stream; 185 } else { 186 cs = (AudioInputStream) (new UlawCodecStream(stream, outputFormat)); 187 } 188 return cs; 189 } 190 191 /** 192 * Obtains the set of output formats supported by the codec 193 * given a particular input format. 194 * If no output formats are supported for this input format, 195 * returns an array of length 0. 196 * @return array of supported output formats. 197 */ 198 /* public AudioFormat[] getOutputFormats(AudioFormat inputFormat) { */ 199 private AudioFormat[] getOutputFormats(AudioFormat inputFormat) { 200 201 Vector formats = new Vector(); 202 AudioFormat format; 203 204 if ((inputFormat.getSampleSizeInBits() == 16) 205 && AudioFormat.Encoding.PCM_SIGNED.equals(inputFormat.getEncoding())) { 206 format = new AudioFormat(AudioFormat.Encoding.ULAW, 207 inputFormat.getSampleRate(), 208 8, 209 inputFormat.getChannels(), 210 inputFormat.getChannels(), 211 inputFormat.getSampleRate(), 212 false ); 213 formats.addElement(format); 214 } 215 216 if (AudioFormat.Encoding.ULAW.equals(inputFormat.getEncoding())) { 217 format = new AudioFormat(AudioFormat.Encoding.PCM_SIGNED, 218 inputFormat.getSampleRate(), 219 16, 220 inputFormat.getChannels(), 221 inputFormat.getChannels()*2, 222 inputFormat.getSampleRate(), 223 false ); 224 formats.addElement(format); 225 226 format = new AudioFormat(AudioFormat.Encoding.PCM_SIGNED, 227 inputFormat.getSampleRate(), 228 16, 229 inputFormat.getChannels(), 230 inputFormat.getChannels()*2, 231 inputFormat.getSampleRate(), 232 true ); 233 formats.addElement(format); 234 } 235 236 AudioFormat[] formatArray = new AudioFormat[formats.size()]; 237 for (int i = 0; i < formatArray.length; i++) { 238 formatArray[i] = (AudioFormat)(formats.elementAt(i)); 239 } 240 return formatArray; 241 } 242 243 244 class UlawCodecStream extends AudioInputStream { 245 246 private static final int tempBufferSize = 64; 247 private byte tempBuffer [] = null; 248 249 /** 250 * True to encode to u-law, false to decode to linear 251 */ 252 boolean encode = false; 253 254 AudioFormat encodeFormat; 255 AudioFormat decodeFormat; 256 257 byte tabByte1[] = null; 258 byte tabByte2[] = null; 259 int highByte = 0; 260 int lowByte = 1; 261 262 UlawCodecStream(AudioInputStream stream, AudioFormat outputFormat) { 263 super(stream, outputFormat, AudioSystem.NOT_SPECIFIED); 264 265 AudioFormat inputFormat = stream.getFormat(); 266 267 // throw an IllegalArgumentException if not ok 268 if (!(isConversionSupported(outputFormat, inputFormat))) { 269 throw new IllegalArgumentException("Unsupported conversion: " + inputFormat.toString() + " to " + outputFormat.toString()); 270 } 271 272 //$$fb 2002-07-18: fix for 4714846: JavaSound ULAW (8-bit) encoder erroneously depends on endian-ness 273 boolean PCMIsBigEndian; 274 275 // determine whether we are encoding or decoding 276 if (AudioFormat.Encoding.ULAW.equals(inputFormat.getEncoding())) { 277 encode = false; 278 encodeFormat = inputFormat; 279 decodeFormat = outputFormat; 280 PCMIsBigEndian = outputFormat.isBigEndian(); 281 } else { 282 encode = true; 283 encodeFormat = outputFormat; 284 decodeFormat = inputFormat; 285 PCMIsBigEndian = inputFormat.isBigEndian(); 286 tempBuffer = new byte[tempBufferSize]; 287 } 288 289 // setup tables according to byte order 290 if (PCMIsBigEndian) { 291 tabByte1 = ULAW_TABH; 292 tabByte2 = ULAW_TABL; 293 highByte = 0; 294 lowByte = 1; 295 } else { 296 tabByte1 = ULAW_TABL; 297 tabByte2 = ULAW_TABH; 298 highByte = 1; 299 lowByte = 0; 300 } 301 302 // set the AudioInputStream length in frames if we know it 303 if (stream instanceof AudioInputStream) { 304 frameLength = stream.getFrameLength(); 305 } 306 // set framePos to zero 307 framePos = 0; 308 frameSize = inputFormat.getFrameSize(); 309 if (frameSize == AudioSystem.NOT_SPECIFIED) { 310 frameSize = 1; 311 } 312 } 313 314 315 /* 316 * $$jb 2/23/99 317 * Used to determine segment number in uLaw encoding 318 */ 319 private short search(short val, short table[], short size) { 320 for(short i = 0; i < size; i++) { 321 if (val <= table[i]) { return i; } 322 } 323 return size; 324 } 325 326 /** 327 * Note that this won't actually read anything; must read in 328 * two-byte units. 329 */ 330 public int read() throws IOException { 331 byte[] b = new byte[1]; 332 if (read(b, 0, b.length) == 1) { 333 return b[1] & 0xFF; 334 } 335 return -1; 336 } 337 338 public int read(byte[] b) throws IOException { 339 return read(b, 0, b.length); 340 } 341 342 public int read(byte[] b, int off, int len) throws IOException { 343 // don't read fractional frames 344 if( len%frameSize != 0 ) { 345 len -= (len%frameSize); 346 } 347 if (encode) { 348 short BIAS = 0x84; 349 short mask; 350 short seg; 351 int i; 352 353 short sample; 354 byte enc; 355 356 int readCount = 0; 357 int currentPos = off; 358 int readLeft = len*2; 359 int readLen = ( (readLeft>tempBufferSize) ? tempBufferSize : readLeft ); 360 361 while ((readCount = super.read(tempBuffer,0,readLen))>0) { 362 for(i = 0; i < readCount; i+=2) { 363 /* Get the sample from the tempBuffer */ 364 sample = (short)(( (tempBuffer[i + highByte]) << 8) & 0xFF00); 365 sample |= (short)( (short) (tempBuffer[i + lowByte]) & 0xFF); 366 367 /* Get the sign and the magnitude of the value. */ 368 if(sample < 0) { 369 sample = (short) (BIAS - sample); 370 mask = 0x7F; 371 } else { 372 sample += BIAS; 373 mask = 0xFF; 374 } 375 /* Convert the scaled magnitude to segment number. */ 376 seg = search(sample, seg_end, (short) 8); 377 /* 378 * Combine the sign, segment, quantization bits; 379 * and complement the code word. 380 */ 381 if (seg >= 8) { /* out of range, return maximum value. */ 382 enc = (byte) (0x7F ^ mask); 383 } else { 384 enc = (byte) ((seg << 4) | ((sample >> (seg+3)) & 0xF)); 385 enc ^= mask; 386 } 387 /* Now put the encoded sample where it belongs */ 388 b[currentPos] = enc; 389 currentPos++; 390 } 391 /* And update pointers and counters for next iteration */ 392 readLeft -= readCount; 393 readLen = ( (readLeft>tempBufferSize) ? tempBufferSize : readLeft ); 394 } 395 if( currentPos==off && readCount<0 ) { // EOF or error on read 396 return readCount; 397 } 398 return (currentPos - off); /* Number of bytes written to new buffer */ 399 } else { 400 int i; 401 int readLen = len/2; 402 int readOffset = off + len/2; 403 int readCount = super.read(b, readOffset, readLen); 404 405 if(readCount<0) { // EOF or error 406 return readCount; 407 } 408 for (i = off; i < (off + (readCount*2)); i+=2) { 409 b[i] = tabByte1[b[readOffset] & 0xFF]; 410 b[i+1] = tabByte2[b[readOffset] & 0xFF]; 411 readOffset++; 412 } 413 return (i - off); 414 } 415 } 416 } // end class UlawCodecStream 417 418 } // end class ULAW