J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 1999-2007 Sun Microsystems, Inc. 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. Sun designates this |
| 8 | * particular file as subject to the "Classpath" exception as provided |
| 9 | * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| 22 | * CA 95054 USA or visit www.sun.com if you need additional information or |
| 23 | * have any questions. |
| 24 | */ |
| 25 | |
| 26 | package com.sun.media.sound; |
| 27 | |
| 28 | import java.io.InputStream; |
| 29 | import java.io.IOException; |
| 30 | |
| 31 | import java.util.Vector; |
| 32 | |
| 33 | import javax.sound.sampled.AudioFormat; |
| 34 | import javax.sound.sampled.AudioSystem; |
| 35 | import javax.sound.sampled.AudioInputStream; |
| 36 | |
| 37 | |
| 38 | /** |
| 39 | * A-law encodes linear data, and decodes a-law data to linear data. |
| 40 | * |
| 41 | * @author Kara Kytle |
| 42 | */ |
| 43 | public class AlawCodec extends SunCodec { |
| 44 | |
| 45 | /* Tables used for A-law decoding */ |
| 46 | |
| 47 | final static byte ALAW_TABH[] = new byte[256]; |
| 48 | final static byte ALAW_TABL[] = new byte[256]; |
| 49 | |
| 50 | private static final AudioFormat.Encoding[] alawEncodings = { AudioFormat.Encoding.ALAW, AudioFormat.Encoding.PCM_SIGNED }; |
| 51 | |
| 52 | private static final short seg_end [] = {0xFF, 0x1FF, 0x3FF, |
| 53 | 0x7FF, 0xFFF, 0x1FFF, 0x3FFF, 0x7FFF}; |
| 54 | |
| 55 | private static final int tempBufferSize = 64; |
| 56 | private byte tempBuffer [] = null; |
| 57 | |
| 58 | /** |
| 59 | * Initializes the decode tables |
| 60 | */ |
| 61 | static { |
| 62 | for (int i=0;i<256;i++) { |
| 63 | int input = i ^ 0x55; |
| 64 | int mantissa = (input & 0xf ) << 4; |
| 65 | int segment = (input & 0x70) >> 4; |
| 66 | int value = mantissa+8; |
| 67 | |
| 68 | if(segment>=1) |
| 69 | value+=0x100; |
| 70 | if(segment>1) |
| 71 | value <<= (segment -1); |
| 72 | |
| 73 | if( (input & 0x80)==0 ) |
| 74 | value = -value; |
| 75 | |
| 76 | ALAW_TABL[i] = (byte)value; |
| 77 | ALAW_TABH[i] = (byte)(value>>8); |
| 78 | } |
| 79 | } |
| 80 | |
| 81 | |
| 82 | /** |
| 83 | * Constructs a new ALAW codec object. |
| 84 | */ |
| 85 | public AlawCodec() { |
| 86 | |
| 87 | super(alawEncodings, alawEncodings); |
| 88 | } |
| 89 | |
| 90 | // NEW CODE |
| 91 | |
| 92 | /** |
| 93 | */ |
| 94 | public AudioFormat.Encoding[] getTargetEncodings(AudioFormat sourceFormat){ |
| 95 | |
| 96 | if( sourceFormat.getEncoding().equals( AudioFormat.Encoding.PCM_SIGNED )) { |
| 97 | |
| 98 | if( sourceFormat.getSampleSizeInBits() == 16 ) { |
| 99 | |
| 100 | AudioFormat.Encoding enc[] = new AudioFormat.Encoding[1]; |
| 101 | enc[0] = AudioFormat.Encoding.ALAW; |
| 102 | return enc; |
| 103 | |
| 104 | } else { |
| 105 | return new AudioFormat.Encoding[0]; |
| 106 | } |
| 107 | } else if( sourceFormat.getEncoding().equals( AudioFormat.Encoding.ALAW ) ) { |
| 108 | |
| 109 | if( sourceFormat.getSampleSizeInBits() == 8 ) { |
| 110 | |
| 111 | AudioFormat.Encoding enc[] = new AudioFormat.Encoding[1]; |
| 112 | enc[0] = AudioFormat.Encoding.PCM_SIGNED; |
| 113 | return enc; |
| 114 | |
| 115 | } else { |
| 116 | return new AudioFormat.Encoding[0]; |
| 117 | } |
| 118 | |
| 119 | } else { |
| 120 | return new AudioFormat.Encoding[0]; |
| 121 | } |
| 122 | } |
| 123 | |
| 124 | /** |
| 125 | */ |
| 126 | public AudioFormat[] getTargetFormats(AudioFormat.Encoding targetEncoding, AudioFormat sourceFormat){ |
| 127 | if( (targetEncoding.equals( AudioFormat.Encoding.PCM_SIGNED ) && sourceFormat.getEncoding().equals( AudioFormat.Encoding.ALAW)) || |
| 128 | (targetEncoding.equals( AudioFormat.Encoding.ALAW) && sourceFormat.getEncoding().equals( AudioFormat.Encoding.PCM_SIGNED)) ) { |
| 129 | return getOutputFormats( sourceFormat ); |
| 130 | } else { |
| 131 | return new AudioFormat[0]; |
| 132 | } |
| 133 | } |
| 134 | |
| 135 | /** |
| 136 | */ |
| 137 | public AudioInputStream getAudioInputStream(AudioFormat.Encoding targetEncoding, AudioInputStream sourceStream){ |
| 138 | AudioFormat sourceFormat = sourceStream.getFormat(); |
| 139 | AudioFormat.Encoding sourceEncoding = sourceFormat.getEncoding(); |
| 140 | |
| 141 | if( sourceEncoding.equals( targetEncoding ) ) { |
| 142 | return sourceStream; |
| 143 | } else { |
| 144 | AudioFormat targetFormat = null; |
| 145 | if( !isConversionSupported(targetEncoding,sourceStream.getFormat()) ) { |
| 146 | throw new IllegalArgumentException("Unsupported conversion: " + sourceStream.getFormat().toString() + " to " + targetEncoding.toString()); |
| 147 | } |
| 148 | if( sourceEncoding.equals( AudioFormat.Encoding.ALAW ) && |
| 149 | targetEncoding.equals( AudioFormat.Encoding.PCM_SIGNED ) ) { |
| 150 | |
| 151 | targetFormat = new AudioFormat( targetEncoding, |
| 152 | sourceFormat.getSampleRate(), |
| 153 | 16, |
| 154 | sourceFormat.getChannels(), |
| 155 | 2*sourceFormat.getChannels(), |
| 156 | sourceFormat.getSampleRate(), |
| 157 | sourceFormat.isBigEndian()); |
| 158 | |
| 159 | } else if( sourceEncoding.equals( AudioFormat.Encoding.PCM_SIGNED ) && |
| 160 | targetEncoding.equals( AudioFormat.Encoding.ALAW ) ) { |
| 161 | |
| 162 | targetFormat = new AudioFormat( targetEncoding, |
| 163 | sourceFormat.getSampleRate(), |
| 164 | 8, |
| 165 | sourceFormat.getChannels(), |
| 166 | sourceFormat.getChannels(), |
| 167 | sourceFormat.getSampleRate(), |
| 168 | false); |
| 169 | } else { |
| 170 | throw new IllegalArgumentException("Unsupported conversion: " + sourceStream.getFormat().toString() + " to " + targetEncoding.toString()); |
| 171 | } |
| 172 | return getAudioInputStream( targetFormat, sourceStream ); |
| 173 | } |
| 174 | } |
| 175 | |
| 176 | /** |
| 177 | * use old code... |
| 178 | */ |
| 179 | public AudioInputStream getAudioInputStream(AudioFormat targetFormat, AudioInputStream sourceStream){ |
| 180 | return getConvertedStream( targetFormat, sourceStream ); |
| 181 | } |
| 182 | |
| 183 | |
| 184 | // OLD CODE |
| 185 | |
| 186 | |
| 187 | /** |
| 188 | * Opens the codec with the specified parameters. |
| 189 | * @param stream stream from which data to be processed should be read |
| 190 | * @param outputFormat desired data format of the stream after processing |
| 191 | * @return stream from which processed data may be read |
| 192 | * @throws IllegalArgumentException if the format combination supplied is |
| 193 | * not supported. |
| 194 | */ |
| 195 | /* public AudioInputStream getConvertedStream(AudioFormat outputFormat, AudioInputStream stream) { */ |
| 196 | private AudioInputStream getConvertedStream(AudioFormat outputFormat, AudioInputStream stream) { |
| 197 | |
| 198 | AudioInputStream cs = null; |
| 199 | AudioFormat inputFormat = stream.getFormat(); |
| 200 | |
| 201 | if( inputFormat.matches(outputFormat) ) { |
| 202 | |
| 203 | cs = stream; |
| 204 | } else { |
| 205 | |
| 206 | cs = (AudioInputStream) (new AlawCodecStream(stream, outputFormat)); |
| 207 | tempBuffer = new byte[tempBufferSize]; |
| 208 | } |
| 209 | |
| 210 | return cs; |
| 211 | } |
| 212 | |
| 213 | /** |
| 214 | * Obtains the set of output formats supported by the codec |
| 215 | * given a particular input format. |
| 216 | * If no output formats are supported for this input format, |
| 217 | * returns an array of length 0. |
| 218 | * @return array of supported output formats. |
| 219 | */ |
| 220 | /* public AudioFormat[] getOutputFormats(AudioFormat inputFormat) { */ |
| 221 | private AudioFormat[] getOutputFormats(AudioFormat inputFormat) { |
| 222 | |
| 223 | |
| 224 | Vector formats = new Vector(); |
| 225 | AudioFormat format; |
| 226 | |
| 227 | if ( AudioFormat.Encoding.PCM_SIGNED.equals(inputFormat.getEncoding())) { |
| 228 | format = new AudioFormat(AudioFormat.Encoding.ALAW, |
| 229 | inputFormat.getSampleRate(), |
| 230 | 8, |
| 231 | inputFormat.getChannels(), |
| 232 | inputFormat.getChannels(), |
| 233 | inputFormat.getSampleRate(), |
| 234 | false ); |
| 235 | formats.addElement(format); |
| 236 | } |
| 237 | |
| 238 | if (AudioFormat.Encoding.ALAW.equals(inputFormat.getEncoding())) { |
| 239 | format = new AudioFormat(AudioFormat.Encoding.PCM_SIGNED, |
| 240 | inputFormat.getSampleRate(), |
| 241 | 16, |
| 242 | inputFormat.getChannels(), |
| 243 | inputFormat.getChannels()*2, |
| 244 | inputFormat.getSampleRate(), |
| 245 | false ); |
| 246 | formats.addElement(format); |
| 247 | format = new AudioFormat(AudioFormat.Encoding.PCM_SIGNED, |
| 248 | inputFormat.getSampleRate(), |
| 249 | 16, |
| 250 | inputFormat.getChannels(), |
| 251 | inputFormat.getChannels()*2, |
| 252 | inputFormat.getSampleRate(), |
| 253 | true ); |
| 254 | formats.addElement(format); |
| 255 | } |
| 256 | |
| 257 | AudioFormat[] formatArray = new AudioFormat[formats.size()]; |
| 258 | for (int i = 0; i < formatArray.length; i++) { |
| 259 | formatArray[i] = (AudioFormat)(formats.elementAt(i)); |
| 260 | } |
| 261 | return formatArray; |
| 262 | } |
| 263 | |
| 264 | |
| 265 | class AlawCodecStream extends AudioInputStream { |
| 266 | |
| 267 | /** |
| 268 | * True to encode to a-law, false to decode to linear |
| 269 | */ |
| 270 | boolean encode = false; |
| 271 | |
| 272 | AudioFormat encodeFormat; |
| 273 | AudioFormat decodeFormat; |
| 274 | |
| 275 | byte tabByte1[] = null; |
| 276 | byte tabByte2[] = null; |
| 277 | int highByte = 0; |
| 278 | int lowByte = 1; |
| 279 | |
| 280 | AlawCodecStream(AudioInputStream stream, AudioFormat outputFormat) { |
| 281 | |
| 282 | super(stream, outputFormat, -1); |
| 283 | |
| 284 | AudioFormat inputFormat = stream.getFormat(); |
| 285 | |
| 286 | // throw an IllegalArgumentException if not ok |
| 287 | if ( ! (isConversionSupported(outputFormat, inputFormat)) ) { |
| 288 | |
| 289 | throw new IllegalArgumentException("Unsupported conversion: " + inputFormat.toString() + " to " + outputFormat.toString()); |
| 290 | } |
| 291 | |
| 292 | //$$fb 2002-07-18: fix for 4714846: JavaSound ULAW (8-bit) encoder erroneously depends on endian-ness |
| 293 | boolean PCMIsBigEndian; |
| 294 | |
| 295 | // determine whether we are encoding or decoding |
| 296 | if (AudioFormat.Encoding.ALAW.equals(inputFormat.getEncoding())) { |
| 297 | encode = false; |
| 298 | encodeFormat = inputFormat; |
| 299 | decodeFormat = outputFormat; |
| 300 | PCMIsBigEndian = outputFormat.isBigEndian(); |
| 301 | } else { |
| 302 | encode = true; |
| 303 | encodeFormat = outputFormat; |
| 304 | decodeFormat = inputFormat; |
| 305 | PCMIsBigEndian = inputFormat.isBigEndian(); |
| 306 | } |
| 307 | |
| 308 | if (PCMIsBigEndian) { |
| 309 | tabByte1 = ALAW_TABH; |
| 310 | tabByte2 = ALAW_TABL; |
| 311 | highByte = 0; |
| 312 | lowByte = 1; |
| 313 | } else { |
| 314 | tabByte1 = ALAW_TABL; |
| 315 | tabByte2 = ALAW_TABH; |
| 316 | highByte = 1; |
| 317 | lowByte = 0; |
| 318 | } |
| 319 | |
| 320 | // set the AudioInputStream length in frames if we know it |
| 321 | if (stream instanceof AudioInputStream) { |
| 322 | frameLength = ((AudioInputStream)stream).getFrameLength(); |
| 323 | } |
| 324 | |
| 325 | // set framePos to zero |
| 326 | framePos = 0; |
| 327 | frameSize = inputFormat.getFrameSize(); |
| 328 | if( frameSize==AudioSystem.NOT_SPECIFIED ) { |
| 329 | frameSize=1; |
| 330 | } |
| 331 | } |
| 332 | |
| 333 | |
| 334 | /* |
| 335 | * $$jb 2/23/99 |
| 336 | * Used to determine segment number in aLaw encoding |
| 337 | */ |
| 338 | private short search(short val, short table[], short size) { |
| 339 | for(short i = 0; i < size; i++) { |
| 340 | if (val <= table[i]) { return i; } |
| 341 | } |
| 342 | return size; |
| 343 | } |
| 344 | |
| 345 | /** |
| 346 | * Note that this won't actually read anything; must read in |
| 347 | * two-byte units. |
| 348 | */ |
| 349 | public int read() throws IOException { |
| 350 | |
| 351 | byte[] b = new byte[1]; |
| 352 | return (int)read(b, 0, b.length); |
| 353 | } |
| 354 | |
| 355 | |
| 356 | public int read(byte[] b) throws IOException { |
| 357 | |
| 358 | return read(b, 0, b.length); |
| 359 | } |
| 360 | |
| 361 | public int read(byte[] b, int off, int len) throws IOException { |
| 362 | |
| 363 | // don't read fractional frames |
| 364 | if( len%frameSize != 0 ) { |
| 365 | len -= (len%frameSize); |
| 366 | } |
| 367 | |
| 368 | if (encode) { |
| 369 | |
| 370 | short QUANT_MASK = 0xF; |
| 371 | short SEG_SHIFT = 4; |
| 372 | short mask; |
| 373 | short seg; |
| 374 | int adj; |
| 375 | int i; |
| 376 | |
| 377 | short sample; |
| 378 | byte enc; |
| 379 | |
| 380 | int readCount = 0; |
| 381 | int currentPos = off; |
| 382 | int readLeft = len*2; |
| 383 | int readLen = ( (readLeft>tempBufferSize) ? tempBufferSize : readLeft ); |
| 384 | |
| 385 | while ((readCount = super.read(tempBuffer,0,readLen))>0) { |
| 386 | |
| 387 | for (i = 0; i < readCount; i+=2) { |
| 388 | |
| 389 | /* Get the sample from the tempBuffer */ |
| 390 | sample = (short)(( (tempBuffer[i + highByte]) << 8) & 0xFF00); |
| 391 | sample |= (short)( (tempBuffer[i + lowByte]) & 0xFF); |
| 392 | |
| 393 | if(sample >= 0) { |
| 394 | mask = 0xD5; |
| 395 | } else { |
| 396 | mask = 0x55; |
| 397 | sample = (short)(-sample - 8); |
| 398 | } |
| 399 | /* Convert the scaled magnitude to segment number. */ |
| 400 | seg = search(sample, seg_end, (short) 8); |
| 401 | /* |
| 402 | * Combine the sign, segment, quantization bits |
| 403 | */ |
| 404 | if (seg >= 8) { /* out of range, return maximum value. */ |
| 405 | enc = (byte) (0x7F ^ mask); |
| 406 | } else { |
| 407 | enc = (byte) (seg << SEG_SHIFT); |
| 408 | if(seg < 2) { |
| 409 | enc |= (byte) ( (sample >> 4) & QUANT_MASK); |
| 410 | } else { |
| 411 | enc |= (byte) ( (sample >> (seg + 3)) & QUANT_MASK ); |
| 412 | } |
| 413 | enc ^= mask; |
| 414 | } |
| 415 | /* Now put the encoded sample where it belongs */ |
| 416 | b[currentPos] = enc; |
| 417 | currentPos++; |
| 418 | } |
| 419 | /* And update pointers and counters for next iteration */ |
| 420 | readLeft -= readCount; |
| 421 | readLen = ( (readLeft>tempBufferSize) ? tempBufferSize : readLeft ); |
| 422 | } |
| 423 | |
| 424 | if( currentPos==off && readCount<0 ) { // EOF or error |
| 425 | return readCount; |
| 426 | } |
| 427 | |
| 428 | return (currentPos - off); /* Number of bytes written to new buffer */ |
| 429 | |
| 430 | } else { |
| 431 | |
| 432 | int i; |
| 433 | int readLen = len/2; |
| 434 | int readOffset = off + len/2; |
| 435 | int readCount = super.read(b, readOffset, readLen); |
| 436 | |
| 437 | for (i = off; i < (off + (readCount*2)); i+=2) { |
| 438 | b[i] = (byte)tabByte1[b[readOffset] & 0xFF]; |
| 439 | b[i+1] = (byte)tabByte2[b[readOffset] & 0xFF]; |
| 440 | readOffset++; |
| 441 | } |
| 442 | |
| 443 | if( readCount<0 ) { // EOF or error |
| 444 | return readCount; |
| 445 | } |
| 446 | |
| 447 | return (i - off); |
| 448 | } |
| 449 | } |
| 450 | } // end class AlawCodecStream |
| 451 | } // end class ALAW |