1 2 /* ----------------------------------------------------------------------------------------------------------- 3 Software License for The Fraunhofer FDK AAC Codec Library for Android 4 5 Copyright 1995 - 2013 Fraunhofer-Gesellschaft zur Frderung der angewandten Forschung e.V. 6 All rights reserved. 7 8 1. INTRODUCTION 9 The Fraunhofer FDK AAC Codec Library for Android ("FDK AAC Codec") is software that implements 10 the MPEG Advanced Audio Coding ("AAC") encoding and decoding scheme for digital audio. 11 This FDK AAC Codec software is intended to be used on a wide variety of Android devices. 12 13 AAC's HE-AAC and HE-AAC v2 versions are regarded as today's most efficient general perceptual 14 audio codecs. AAC-ELD is considered the best-performing full-bandwidth communications codec by 15 independent studies and is widely deployed. AAC has been standardized by ISO and IEC as part 16 of the MPEG specifications. 17 18 Patent licenses for necessary patent claims for the FDK AAC Codec (including those of Fraunhofer) 19 may be obtained through Via Licensing (www.vialicensing.com) or through the respective patent owners 20 individually for the purpose of encoding or decoding bit streams in products that are compliant with 21 the ISO/IEC MPEG audio standards. Please note that most manufacturers of Android devices already license 22 these patent claims through Via Licensing or directly from the patent owners, and therefore FDK AAC Codec 23 software may already be covered under those patent licenses when it is used for those licensed purposes only. 24 25 Commercially-licensed AAC software libraries, including floating-point versions with enhanced sound quality, 26 are also available from Fraunhofer. Users are encouraged to check the Fraunhofer website for additional 27 applications information and documentation. 28 29 2. COPYRIGHT LICENSE 30 31 Redistribution and use in source and binary forms, with or without modification, are permitted without 32 payment of copyright license fees provided that you satisfy the following conditions: 33 34 You must retain the complete text of this software license in redistributions of the FDK AAC Codec or 35 your modifications thereto in source code form. 36 37 You must retain the complete text of this software license in the documentation and/or other materials 38 provided with redistributions of the FDK AAC Codec or your modifications thereto in binary form. 39 You must make available free of charge copies of the complete source code of the FDK AAC Codec and your 40 modifications thereto to recipients of copies in binary form. 41 42 The name of Fraunhofer may not be used to endorse or promote products derived from this library without 43 prior written permission. 44 45 You may not charge copyright license fees for anyone to use, copy or distribute the FDK AAC Codec 46 software or your modifications thereto. 47 48 Your modified versions of the FDK AAC Codec must carry prominent notices stating that you changed the software 49 and the date of any change. For modified versions of the FDK AAC Codec, the term 50 "Fraunhofer FDK AAC Codec Library for Android" must be replaced by the term 51 "Third-Party Modified Version of the Fraunhofer FDK AAC Codec Library for Android." 52 53 3. NO PATENT LICENSE 54 55 NO EXPRESS OR IMPLIED LICENSES TO ANY PATENT CLAIMS, including without limitation the patents of Fraunhofer, 56 ARE GRANTED BY THIS SOFTWARE LICENSE. Fraunhofer provides no warranty of patent non-infringement with 57 respect to this software. 58 59 You may use this FDK AAC Codec software or modifications thereto only for purposes that are authorized 60 by appropriate patent licenses. 61 62 4. DISCLAIMER 63 64 This FDK AAC Codec software is provided by Fraunhofer on behalf of the copyright holders and contributors 65 "AS IS" and WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, including but not limited to the implied warranties 66 of merchantability and fitness for a particular purpose. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR 67 CONTRIBUTORS BE LIABLE for any direct, indirect, incidental, special, exemplary, or consequential damages, 68 including but not limited to procurement of substitute goods or services; loss of use, data, or profits, 69 or business interruption, however caused and on any theory of liability, whether in contract, strict 70 liability, or tort (including negligence), arising in any way out of the use of this software, even if 71 advised of the possibility of such damage. 72 73 5. CONTACT INFORMATION 74 75 Fraunhofer Institute for Integrated Circuits IIS 76 Attention: Audio and Multimedia Departments - FDK AAC LL 77 Am Wolfsmantel 33 78 91058 Erlangen, Germany 79 80 www.iis.fraunhofer.de/amm 81 amm-info (at) iis.fraunhofer.de 82 ----------------------------------------------------------------------------------------------------------- */ 83 84 /************************** Fraunhofer IIS FDK SysLib ********************** 85 86 Author(s): Eric Allamanche 87 Description: a rudimentary wav file interface 88 89 ******************************************************************************/ 90 91 92 93 #include "wav_file.h" 94 #include "genericStds.h" 95 96 97 static INT_PCM ulaw2pcm (UCHAR ulawbyte); 98 99 /*! 100 * 101 * \brief Read header from a WAVEfile. Host endianess is handled accordingly. 102 * \wav->fp filepointer of type FILE*. 103 * \wavinfo SWavInfo struct where the decoded header info is stored into. 104 * \return 0 on success and non-zero on failure. 105 * 106 */ 107 INT WAV_InputOpen (HANDLE_WAV *pWav, const char *filename) 108 { 109 HANDLE_WAV wav = (HANDLE_WAV)FDKcalloc(1, sizeof(struct WAV)); 110 INT offset; 111 112 if (wav == NULL) { 113 FDKprintfErr("WAV_InputOpen(): Unable to allocate WAV struct.\n"); 114 goto error; 115 } 116 117 wav->fp = FDKfopen(filename, "rb"); 118 if (wav->fp == NULL) { 119 FDKprintfErr("WAV_InputOpen(): Unable to open wav file. %s\n", filename); 120 goto error; 121 } 122 123 /* read RIFF-chunk */ 124 if (FDKfread(&(wav->header.riffType), 1, 4, wav->fp) != 4) { 125 FDKprintfErr("WAV_InputOpen(): couldn't read RIFF_ID\n"); 126 goto error; /* bad error "couldn't read RIFF_ID" */ 127 } 128 if (FDKstrncmp("RIFF", wav->header.riffType, 4)) { 129 FDKprintfErr("WAV_InputOpen(): RIFF descriptor not found.\n") ; 130 goto error; 131 } 132 133 /* Read RIFF size. Ignored. */ 134 FDKfread_EL(&(wav->header.riffSize), 4, 1, wav->fp); 135 136 /* read WAVE-chunk */ 137 if (FDKfread(&wav->header.waveType, 1, 4, wav->fp) !=4) { 138 FDKprintfErr("WAV_InputOpen(): couldn't read format\n"); 139 goto error; /* bad error "couldn't read format" */ 140 } 141 if (FDKstrncmp("WAVE", wav->header.waveType, 4)) { 142 FDKprintfErr("WAV_InputOpen(): WAVE chunk ID not found.\n") ; 143 goto error; 144 } 145 146 /* read format-chunk */ 147 if (FDKfread(&(wav->header.formatType), 1, 4, wav->fp) != 4) { 148 FDKprintfErr("WAV_InputOpen(): couldn't read format_ID\n"); 149 goto error; /* bad error "couldn't read format_ID" */ 150 } 151 if (FDKstrncmp("fmt", wav->header.formatType, 3)) { 152 FDKprintfErr("WAV_InputOpen(): fmt chunk format not found.\n") ; 153 goto error; 154 } 155 156 157 FDKfread_EL(&wav->header.formatSize, 4, 1, wav->fp); /* should be 16 for PCM-format (uncompressed) */ 158 159 160 /* read info */ 161 FDKfread_EL(&(wav->header.compressionCode), 2, 1, wav->fp); 162 FDKfread_EL(&(wav->header.numChannels), 2, 1, wav->fp); 163 FDKfread_EL(&(wav->header.sampleRate), 4, 1, wav->fp); 164 FDKfread_EL(&(wav->header.bytesPerSecond), 4, 1, wav->fp); 165 FDKfread_EL(&(wav->header.blockAlign), 2, 1, wav->fp); 166 FDKfread_EL(&(wav->header.bitsPerSample), 2, 1, wav->fp); 167 168 offset = wav->header.formatSize - 16; 169 170 /* Wave format extensible */ 171 if (wav->header.compressionCode == 0xFFFE) { 172 static const UCHAR guidPCM[16] = { 173 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x10, 0x00, 174 0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71 175 }; 176 USHORT extraFormatBytes, validBitsPerSample; 177 UCHAR guid[16]; 178 INT i; 179 180 /* read extra bytes */ 181 FDKfread_EL(&(extraFormatBytes), 2, 1, wav->fp); 182 offset -= 2; 183 184 if (extraFormatBytes >= 22) { 185 FDKfread_EL(&(validBitsPerSample), 2, 1, wav->fp); 186 FDKfread_EL(&(wav->channelMask), 4, 1, wav->fp); 187 FDKfread_EL(&(guid), 16, 1, wav->fp); 188 189 /* check for PCM GUID */ 190 for (i = 0; i < 16; i++) if (guid[i] != guidPCM[i]) break; 191 if (i == 16) wav->header.compressionCode = 0x01; 192 193 offset -= 22; 194 } 195 } 196 197 /* Skip rest of fmt header if any. */ 198 for (;offset > 0; offset--) { 199 FDKfread(&wav->header.formatSize, 1, 1, wav->fp); 200 } 201 202 do { 203 /* Read data chunk ID */ 204 if (FDKfread(wav->header.dataType, 1, 4, wav->fp) != 4) { 205 FDKprintfErr("WAV_InputOpen(): Unable to read data chunk ID.\n"); 206 FDKfree(wav); 207 goto error; 208 } 209 210 /* Read chunk length. */ 211 FDKfread_EL(&offset, 4, 1, wav->fp); 212 213 /* Check for data chunk signature. */ 214 if (FDKstrncmp("data", wav->header.dataType, 4) == 0) { 215 wav->header.dataSize = offset; 216 break; 217 } 218 /* Jump over non data chunk. */ 219 for (;offset > 0; offset--) { 220 FDKfread(&(wav->header.dataSize), 1, 1, wav->fp); 221 } 222 } while (!FDKfeof(wav->fp)); 223 224 /* return success */ 225 *pWav = wav; 226 return 0; 227 228 /* Error path */ 229 error: 230 231 if (wav) { 232 if (wav->fp) { 233 FDKfclose(wav->fp); 234 wav->fp = NULL; 235 } 236 FDKfree(wav); 237 } 238 239 *pWav = NULL; 240 241 return -1; 242 } 243 244 /*! 245 * 246 * \brief Read samples from a WAVEfile. The samples are automatically reorder to the native 247 * host endianess and scaled to full scale of the INT_PCM type, from whatever bps the WAVEfile 248 * had specified in its haader data. 249 * 250 * \wav HANDLE_WAV of the wav file. 251 * \buffer Pointer to store read data. 252 * \numSamples Desired number of samples to read. 253 * \nBits sample size in bits to be used for the buffer 254 * 255 * \return Number of samples actually read. 256 * 257 */ 258 259 INT WAV_InputRead (HANDLE_WAV wav, void *buffer, UINT numSamples, int nBits) 260 { 261 UINT result = 0 ; 262 UINT i; 263 SCHAR *bptr = (SCHAR*)buffer; 264 LONG *lptr = (LONG*)buffer; 265 SHORT *sptr = (SHORT*)buffer; 266 267 switch (wav->header.compressionCode) 268 { 269 case 0x01: /* PCM uncompressed */ 270 if (nBits == wav->header.bitsPerSample) { 271 result = FDKfread_EL(buffer, wav->header.bitsPerSample >> 3, numSamples, wav->fp) ; 272 } else { 273 result = 0; 274 for (i=0; i<numSamples; i++) 275 { 276 LONG tmp = 0; 277 result += FDKfread_EL(&tmp, wav->header.bitsPerSample >> 3, 1, wav->fp) ; 278 279 /* Move read bits to lower bits of LONG. */ 280 if ( !IS_LITTLE_ENDIAN() && wav->header.bitsPerSample != 24 && wav->header.bitsPerSample < 32) { 281 tmp >>= (32-wav->header.bitsPerSample); 282 } 283 284 /* Full scale */ 285 if (wav->header.bitsPerSample > nBits) 286 tmp >>= (wav->header.bitsPerSample-nBits); 287 else 288 tmp <<= (nBits-wav->header.bitsPerSample); 289 290 if (nBits == 8) 291 *bptr++ = (SCHAR) tmp; 292 if (nBits == 16) 293 *sptr++ = (SHORT) tmp; 294 if (nBits == 32) 295 *lptr++ = (LONG) tmp; 296 } 297 } 298 break; 299 300 case 0x07: /* u-Law compression */ 301 for (i=0; i<numSamples; i++) { 302 result += FDKfread(&(bptr[i<<1]), 1, 1, wav->fp) ; 303 sptr[i] = ulaw2pcm(bptr[i<<1]) ; 304 } 305 break ; 306 307 default: 308 FDKprintf("WAV_InputRead(): unsupported data-compression!!") ; 309 break ; 310 } 311 return result ; 312 } 313 314 void WAV_InputClose(HANDLE_WAV *pWav) 315 { 316 HANDLE_WAV wav = *pWav; 317 318 if (wav != NULL) { 319 if (wav->fp != NULL) { 320 FDKfclose(wav->fp); 321 wav->fp = NULL; 322 } 323 if (wav) { 324 FDKfree(wav); 325 } 326 } 327 *pWav = NULL; 328 } 329 330 /* conversion of u-law to linear coding */ 331 static INT_PCM ulaw2pcm (UCHAR ulawbyte) 332 { 333 static const INT exp_lut[8] = { 0, 132, 396, 924, 1980, 4092, 8316, 16764 } ; 334 INT sign, exponent, mantissa, sample ; 335 336 ulawbyte = (UCHAR)~ulawbyte ; 337 sign = (ulawbyte & 0x80) ; 338 exponent = (ulawbyte >> 4) & 0x07 ; 339 mantissa = ulawbyte & 0x0F ; 340 341 sample = exp_lut[exponent] + (mantissa << (exponent + 3)) ; 342 if (sign != 0) 343 sample = -sample ; 344 345 return (INT_PCM)sample ; 346 } 347 348 /************** Writer ***********************/ 349 350 static UINT LittleEndian32(UINT v) 351 { 352 if (IS_LITTLE_ENDIAN()) 353 return v ; 354 else 355 return (v & 0x000000FF) << 24 | (v & 0x0000FF00) << 8 | (v & 0x00FF0000) >> 8 | (v & 0xFF000000) >> 24; 356 } 357 358 static SHORT LittleEndian16(SHORT v) 359 { 360 if (IS_LITTLE_ENDIAN()) 361 return v; 362 else 363 return (SHORT)(((v << 8) & 0xFF00) | ((v >> 8) & 0x00FF)); 364 } 365 366 static USHORT Unpack(USHORT v) 367 { 368 if (IS_LITTLE_ENDIAN()) 369 return v; 370 else 371 return (SHORT)(((v << 8) & 0xFF00) | ((v >> 8) & 0x00FF)); 372 } 373 374 /** 375 * WAV_OutputOpen 376 * \brief Open WAV output/writer handle 377 * \param pWav pointer to WAV handle to be returned 378 * \param sampleRate desired samplerate of the resulting WAV file 379 * \param numChannels desired number of audio channels of the resulting WAV file 380 * \param bitsPerSample desired number of bits per audio sample of the resulting WAV file 381 * 382 * \return value: 0: ok 383 * -1: error 384 */ 385 INT WAV_OutputOpen(HANDLE_WAV *pWav, const char *outputFilename, INT sampleRate, INT numChannels, INT bitsPerSample) 386 { 387 HANDLE_WAV wav = (HANDLE_WAV)FDKcalloc(1, sizeof(struct WAV)); 388 UINT size = 0; 389 390 if (wav == NULL) { 391 FDKprintfErr("WAV_OutputOpen(): Unable to allocate WAV struct.\n"); 392 goto bail; 393 } 394 395 if (bitsPerSample != 16 && bitsPerSample != 24 && bitsPerSample != 32) 396 { 397 FDKprintfErr("WAV_OutputOpen(): Invalid argument (bitsPerSample).\n"); 398 goto bail; 399 } 400 401 wav->fp = FDKfopen(outputFilename, "wb"); 402 if (wav->fp == NULL) 403 { 404 FDKprintfErr("WAV_OutputOpen(): unable to create file %s\n", outputFilename); 405 goto bail; 406 } 407 408 FDKstrcpy(wav->header.riffType, "RIFF"); 409 wav->header.riffSize = LittleEndian32(0x7fffffff); /* in case fseek() doesn't work later in WAV_OutputClose() */ 410 FDKstrcpy(wav->header.waveType, "WAVE"); 411 412 FDKstrcpy(wav->header.formatType, "fmt "); 413 wav->header.formatSize = LittleEndian32(16); 414 415 wav->header.compressionCode = LittleEndian16(0x01); 416 wav->header.bitsPerSample = LittleEndian16((SHORT)bitsPerSample); 417 wav->header.numChannels = LittleEndian16((SHORT)numChannels); 418 wav->header.blockAlign = LittleEndian16((SHORT)(numChannels * (bitsPerSample >> 3))); 419 wav->header.sampleRate = LittleEndian32(sampleRate); 420 wav->header.bytesPerSecond = LittleEndian32(sampleRate * wav->header.blockAlign); 421 FDKstrcpy(wav->header.dataType, "data"); 422 wav->header.dataSize = LittleEndian32(0x7fffffff - 36); 423 424 425 size = sizeof(WAV_HEADER); 426 if (FDKfwrite(&wav->header, 1, size, wav->fp) != size) 427 { 428 FDKprintfErr("WAV_OutputOpen(): error writing to output file %s\n", outputFilename); 429 goto bail; 430 } 431 432 433 wav->header.dataSize = wav->header.riffSize = 0; 434 435 *pWav = wav; 436 437 return 0; 438 439 bail: 440 if (wav) { 441 if (wav->fp) { 442 FDKfclose(wav->fp); 443 } 444 FDKfree(wav); 445 } 446 447 pWav = NULL; 448 449 return -1; 450 } 451 452 453 /** 454 * WAV_OutputWrite 455 * \brief Write data to WAV file asociated to WAV handle 456 * 457 * \param wav handle of wave file 458 * \param sampleBuffer pointer to audio samples, right justified integer values 459 * \param nBufBits size in bits of each audio sample in sampleBuffer 460 * \param nSigBits amount of significant bits of each nBufBits in sampleBuffer 461 * 462 * \return value: 0: ok 463 * -1: error 464 */ 465 INT WAV_OutputWrite(HANDLE_WAV wav, void *sampleBuffer, UINT numberOfSamples, int nBufBits, int nSigBits) 466 { 467 SCHAR *bptr = (SCHAR*)sampleBuffer; 468 SHORT *sptr = (SHORT*)sampleBuffer; 469 LONG *lptr = (LONG*)sampleBuffer; 470 LONG tmp; 471 472 int bps = Unpack(wav->header.bitsPerSample); 473 UINT i; 474 475 /* Pack samples if required */ 476 if (bps == nBufBits && bps == nSigBits) { 477 if (FDKfwrite_EL(sampleBuffer, (bps>>3), numberOfSamples, wav->fp) != numberOfSamples) 478 { 479 FDKprintfErr("WAV_OutputWrite(): error: unable to write to file %d\n", wav->fp); 480 return -1; 481 } 482 } else { 483 for (i=0; i<numberOfSamples; i++) 484 { 485 int result; 486 int shift; 487 488 switch (nBufBits) { 489 case 8: tmp = *bptr++; break; 490 case 16: tmp = *sptr++; break; 491 case 32: tmp = *lptr++; break; 492 default: return -1; 493 } 494 /* Adapt sample size */ 495 shift = (nBufBits-nSigBits)-(32-bps); 496 497 /* Correct alignment difference between 32 bit data buffer "tmp" and 24 bits to be written. */ 498 if ( !IS_LITTLE_ENDIAN() && bps == 24) { 499 shift += 8; 500 } 501 502 if (shift < 0) 503 tmp >>= -shift; 504 else 505 tmp <<= shift; 506 507 /* Write sample */ 508 result=FDKfwrite_EL(&tmp, bps>>3, 1, wav->fp); 509 if (result <= 0) { 510 FDKprintfErr("WAV_OutputWrite(): error: unable to write to file %d\n", wav->fp); 511 return -1; 512 } 513 } 514 } 515 516 wav->header.dataSize += (numberOfSamples * (bps>>3)); 517 return 0; 518 } 519 520 521 /** 522 * WAV_OutputClose 523 * \brief Close WAV Output handle 524 * \param pWav pointer to WAV handle. *pWav is set to NULL. 525 */ 526 void WAV_OutputClose(HANDLE_WAV *pWav) 527 { 528 HANDLE_WAV wav = *pWav; 529 UINT size = 0; 530 531 if ( wav == NULL ) { 532 return; 533 } 534 535 wav->header.dataSize = LittleEndian32(wav->header.dataSize); 536 wav->header.riffSize = LittleEndian32(wav->header.dataSize + 36); 537 538 if (wav->fp != NULL) 539 { 540 if (FDKfseek(wav->fp, 0, FDKSEEK_SET)) { 541 FDKprintf("WAV_OutputClose(): fseek() failed.\n"); 542 } 543 544 size = sizeof(WAV_HEADER); 545 if (FDKfwrite(&wav->header.riffType, 1, size, wav->fp) != size) 546 { 547 FDKprintfErr("WAV_OutputClose(): unable to write header\n"); 548 } 549 550 if (FDKfclose(wav->fp)) 551 { 552 FDKprintfErr("WAV_OutputClose(): unable to close wav file\n"); 553 } 554 wav->fp = NULL; 555 } 556 557 FDKfree(wav); 558 *pWav = NULL; 559 } 560 561
