1 2 /* ----------------------------------------------------------------------------------------------------------- 3 Software License for The Fraunhofer FDK AAC Codec Library for Android 4 5 Copyright 1995 - 2012 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 /***************************** MPEG-4 AAC Decoder ************************** 85 86 Author(s): Josef Hoepfl 87 Description: 88 89 ******************************************************************************/ 90 91 #include "channel.h" 92 #include "aacdecoder.h" 93 #include "block.h" 94 #include "aacdec_tns.h" 95 #include "FDK_bitstream.h" 96 #include "FDK_tools_rom.h" 97 98 #include "conceal.h" 99 100 #include "rvlc.h" 101 102 #include "aacdec_hcr.h" 103 104 105 static 106 void MapMidSideMaskToPnsCorrelation (CAacDecoderChannelInfo *pAacDecoderChannelInfo[2]) 107 { 108 int group; 109 110 for (group = 0 ; group < pAacDecoderChannelInfo[L]->icsInfo.WindowGroups; group++) { 111 UCHAR groupMask = 1 << group; 112 113 for (UCHAR band = 0 ; band < pAacDecoderChannelInfo[L]->icsInfo.MaxSfBands; band++) { 114 if (pAacDecoderChannelInfo[L]->pComData->jointStereoData.MsUsed[band] & groupMask) { /* channels are correlated */ 115 CPns_SetCorrelation(&pAacDecoderChannelInfo[L]->data.aac.PnsData, group, band, 0); 116 117 if (CPns_IsPnsUsed(&pAacDecoderChannelInfo[L]->data.aac.PnsData, group, band) && 118 CPns_IsPnsUsed(&pAacDecoderChannelInfo[R]->data.aac.PnsData, group, band)) 119 pAacDecoderChannelInfo[L]->pComData->jointStereoData.MsUsed[band] ^= groupMask; /* clear the groupMask-bit */ 120 } 121 } 122 } 123 } 124 125 /*! 126 \brief Decode channel pair element 127 128 The function decodes a channel pair element. 129 130 \return none 131 */ 132 void CChannelElement_Decode( CAacDecoderChannelInfo *pAacDecoderChannelInfo[2], /*!< pointer to aac decoder channel info */ 133 CAacDecoderStaticChannelInfo *pAacDecoderStaticChannelInfo[2], 134 SamplingRateInfo *pSamplingRateInfo, 135 UINT flags, 136 int el_channels) 137 { 138 int ch, maybe_jstereo = 0; 139 140 maybe_jstereo = (el_channels > 1); 141 142 for (ch = 0; ch < el_channels; ch++) { 143 if ( pAacDecoderChannelInfo[ch]->renderMode == AACDEC_RENDER_IMDCT 144 || pAacDecoderChannelInfo[ch]->renderMode == AACDEC_RENDER_ELDFB ) 145 { 146 CBlock_InverseQuantizeSpectralData(pAacDecoderChannelInfo[ch], pSamplingRateInfo); 147 } 148 } 149 150 151 152 if (maybe_jstereo) { 153 /* apply ms */ 154 if (pAacDecoderChannelInfo[L]->pDynData->RawDataInfo.CommonWindow) { 155 int maxSfBandsL = GetScaleFactorBandsTransmitted(&pAacDecoderChannelInfo[L]->icsInfo); 156 int maxSfBandsR = GetScaleFactorBandsTransmitted(&pAacDecoderChannelInfo[R]->icsInfo); 157 if (pAacDecoderChannelInfo[L]->data.aac.PnsData.PnsActive || pAacDecoderChannelInfo[R]->data.aac.PnsData.PnsActive) { 158 MapMidSideMaskToPnsCorrelation(pAacDecoderChannelInfo); 159 } 160 161 CJointStereo_ApplyMS(pAacDecoderChannelInfo, 162 GetScaleFactorBandOffsets(&pAacDecoderChannelInfo[L]->icsInfo, pSamplingRateInfo), 163 GetWindowGroupLengthTable(&pAacDecoderChannelInfo[L]->icsInfo), 164 GetWindowGroups(&pAacDecoderChannelInfo[L]->icsInfo), 165 maxSfBandsL, 166 maxSfBandsR); 167 } 168 169 /* apply intensity stereo */ /* modifies pAacDecoderChannelInfo[]->aSpecSfb */ 170 CJointStereo_ApplyIS(pAacDecoderChannelInfo, 171 GetScaleFactorBandOffsets(&pAacDecoderChannelInfo[L]->icsInfo, pSamplingRateInfo), 172 GetWindowGroupLengthTable(&pAacDecoderChannelInfo[L]->icsInfo), 173 GetWindowGroups(&pAacDecoderChannelInfo[L]->icsInfo), 174 GetScaleFactorBandsTransmitted(&pAacDecoderChannelInfo[L]->icsInfo), 175 pAacDecoderChannelInfo[L]->pDynData->RawDataInfo.CommonWindow ? 1 : 0); 176 177 } 178 179 for (ch = 0; ch < el_channels; ch++) 180 { 181 { 182 /* write pAacDecoderChannelInfo[ch]->specScale */ 183 CBlock_ScaleSpectralData(pAacDecoderChannelInfo[ch], pSamplingRateInfo); 184 185 ApplyTools (pAacDecoderChannelInfo, pSamplingRateInfo, flags, ch); 186 } 187 188 } 189 190 CRvlc_ElementCheck( 191 pAacDecoderChannelInfo, 192 pAacDecoderStaticChannelInfo, 193 flags, 194 el_channels 195 ); 196 } 197 198 void CChannel_CodebookTableInit(CAacDecoderChannelInfo *pAacDecoderChannelInfo) 199 { 200 int b, w, maxBands, maxWindows; 201 int maxSfb = GetScaleFactorBandsTransmitted(&pAacDecoderChannelInfo->icsInfo); 202 UCHAR *pCodeBook = pAacDecoderChannelInfo->pDynData->aCodeBook; 203 204 if ( IsLongBlock(&pAacDecoderChannelInfo->icsInfo) ) { 205 maxBands = 64; 206 maxWindows = 1; 207 } else { 208 maxBands = 16; 209 maxWindows = 8; 210 } 211 212 for (w = 0; w<maxWindows; w++) { 213 for (b = 0; b < maxSfb; b++) { 214 pCodeBook[b] = ESCBOOK; 215 } 216 for (; b<maxBands; b++) { 217 pCodeBook[b] = ZERO_HCB; 218 } 219 pCodeBook += maxBands; 220 } 221 } 222 223 224 /* 225 * Arbitrary order bitstream parser 226 */ 227 228 AAC_DECODER_ERROR CChannelElement_Read(HANDLE_FDK_BITSTREAM hBs, 229 CAacDecoderChannelInfo *pAacDecoderChannelInfo[], 230 CAacDecoderStaticChannelInfo *pAacDecoderStaticChannelInfo[], 231 const AUDIO_OBJECT_TYPE aot, 232 const SamplingRateInfo *pSamplingRateInfo, 233 const UINT flags, 234 const UINT frame_length, 235 const UCHAR numberOfChannels, 236 const SCHAR epConfig, 237 HANDLE_TRANSPORTDEC pTpDec 238 ) 239 { 240 AAC_DECODER_ERROR error = AAC_DEC_OK; 241 const element_list_t *list; 242 int i, ch, decision_bit; 243 int crcReg1 = -1, crcReg2 = -1; 244 245 FDK_ASSERT( (numberOfChannels == 1) || (numberOfChannels == 2) ); 246 247 /* Get channel element sequence table */ 248 list = getBitstreamElementList(aot, epConfig, numberOfChannels, 0); 249 if (list == NULL) { 250 error = AAC_DEC_UNSUPPORTED_FORMAT; 251 goto bail; 252 } 253 254 CTns_Reset(&pAacDecoderChannelInfo[0]->pDynData->TnsData); 255 if (numberOfChannels == 2) { 256 CTns_Reset(&pAacDecoderChannelInfo[1]->pDynData->TnsData); 257 } 258 259 if (flags & (AC_ELD|AC_SCALABLE)) { 260 pAacDecoderChannelInfo[0]->pDynData->RawDataInfo.CommonWindow = 1; 261 if (numberOfChannels == 2) { 262 pAacDecoderChannelInfo[1]->pDynData->RawDataInfo.CommonWindow = pAacDecoderChannelInfo[0]->pDynData->RawDataInfo.CommonWindow; 263 } 264 if (numberOfChannels == 2) { 265 pAacDecoderChannelInfo[1]->pDynData->RawDataInfo.CommonWindow = pAacDecoderChannelInfo[0]->pDynData->RawDataInfo.CommonWindow; 266 } 267 } 268 269 /* Iterate through sequence table */ 270 i = 0; 271 ch = 0; 272 decision_bit = 0; 273 do { 274 switch (list->id[i]) { 275 case element_instance_tag: 276 pAacDecoderChannelInfo[0]->ElementInstanceTag = FDKreadBits(hBs, 4); 277 if (numberOfChannels == 2) { 278 pAacDecoderChannelInfo[1]->ElementInstanceTag = pAacDecoderChannelInfo[0]->ElementInstanceTag; 279 } 280 break; 281 case common_window: 282 decision_bit = pAacDecoderChannelInfo[ch]->pDynData->RawDataInfo.CommonWindow = FDKreadBits(hBs, 1); 283 if (numberOfChannels == 2) { 284 pAacDecoderChannelInfo[1]->pDynData->RawDataInfo.CommonWindow = pAacDecoderChannelInfo[0]->pDynData->RawDataInfo.CommonWindow; 285 } 286 break; 287 case ics_info: 288 /* Read individual channel info */ 289 error = IcsRead( hBs, 290 &pAacDecoderChannelInfo[ch]->icsInfo, 291 pSamplingRateInfo, 292 flags ); 293 294 if (numberOfChannels == 2 && pAacDecoderChannelInfo[0]->pDynData->RawDataInfo.CommonWindow) { 295 pAacDecoderChannelInfo[1]->icsInfo = pAacDecoderChannelInfo[0]->icsInfo; 296 } 297 break; 298 299 300 case ltp_data_present: 301 if (FDKreadBits(hBs, 1) != 0) { 302 error = AAC_DEC_UNSUPPORTED_PREDICTION; 303 } 304 break; 305 306 case ms: 307 if ( CJointStereo_Read( 308 hBs, 309 &pAacDecoderChannelInfo[0]->pComData->jointStereoData, 310 GetWindowGroups(&pAacDecoderChannelInfo[0]->icsInfo), 311 GetScaleMaxFactorBandsTransmitted(&pAacDecoderChannelInfo[0]->icsInfo, 312 &pAacDecoderChannelInfo[1]->icsInfo), 313 flags) ) 314 { 315 error = AAC_DEC_PARSE_ERROR; 316 } 317 break; 318 319 case global_gain: 320 pAacDecoderChannelInfo[ch]->pDynData->RawDataInfo.GlobalGain = (UCHAR) FDKreadBits(hBs,8); 321 break; 322 323 case section_data: 324 error = CBlock_ReadSectionData( hBs, 325 pAacDecoderChannelInfo[ch], 326 pSamplingRateInfo, 327 flags ); 328 break; 329 330 331 case scale_factor_data: 332 if (flags & AC_ER_RVLC) { 333 /* read RVLC data from bitstream (error sens. cat. 1) */ 334 CRvlc_Read(pAacDecoderChannelInfo[ch], hBs); 335 } 336 else 337 { 338 error = CBlock_ReadScaleFactorData(pAacDecoderChannelInfo[ch], hBs, flags); 339 } 340 break; 341 342 case pulse: 343 if ( CPulseData_Read( hBs, 344 &pAacDecoderChannelInfo[ch]->pDynData->specificTo.aac.PulseData, 345 pSamplingRateInfo->ScaleFactorBands_Long, /* pulse data is only allowed to be present in long blocks! */ 346 (void*)&pAacDecoderChannelInfo[ch]->icsInfo, 347 frame_length 348 ) != 0 ) 349 { 350 error = AAC_DEC_DECODE_FRAME_ERROR; 351 } 352 break; 353 case tns_data_present: 354 CTns_ReadDataPresentFlag(hBs, &pAacDecoderChannelInfo[ch]->pDynData->TnsData); 355 break; 356 case tns_data: 357 /* tns_data_present is checked inside CTns_Read(). */ 358 error = CTns_Read(hBs, &pAacDecoderChannelInfo[ch]->pDynData->TnsData, &pAacDecoderChannelInfo[ch]->icsInfo, flags); 359 break; 360 361 case gain_control_data: 362 break; 363 364 case gain_control_data_present: 365 if (FDKreadBits(hBs, 1)) { 366 error = AAC_DEC_UNSUPPORTED_GAIN_CONTROL_DATA; 367 } 368 break; 369 370 case esc2_rvlc: 371 if (flags & AC_ER_RVLC) { 372 CRvlc_Decode( 373 pAacDecoderChannelInfo[ch], 374 pAacDecoderStaticChannelInfo[ch], 375 hBs 376 ); 377 } 378 break; 379 380 case esc1_hcr: 381 if (flags & AC_ER_HCR) { 382 CHcr_Read(hBs, pAacDecoderChannelInfo[ch] ); 383 } 384 break; 385 386 case spectral_data: 387 error = CBlock_ReadSpectralData( hBs, 388 pAacDecoderChannelInfo[ch], 389 pSamplingRateInfo, 390 flags ); 391 if (flags & AC_ELD) { 392 pAacDecoderChannelInfo[ch]->renderMode = AACDEC_RENDER_ELDFB; 393 } else { 394 pAacDecoderChannelInfo[ch]->renderMode = AACDEC_RENDER_IMDCT; 395 } 396 break; 397 398 399 /* CRC handling */ 400 case adtscrc_start_reg1: 401 if (pTpDec != NULL) { 402 crcReg1 = transportDec_CrcStartReg(pTpDec, 192); 403 } 404 break; 405 case adtscrc_start_reg2: 406 if (pTpDec != NULL) { 407 crcReg2 = transportDec_CrcStartReg(pTpDec, 128); 408 } 409 break; 410 case adtscrc_end_reg1: 411 case drmcrc_end_reg: 412 if (pTpDec != NULL) { 413 transportDec_CrcEndReg(pTpDec, crcReg1); 414 } 415 break; 416 case adtscrc_end_reg2: 417 if (pTpDec != NULL) { 418 transportDec_CrcEndReg(pTpDec, crcReg2); 419 } 420 break; 421 case drmcrc_start_reg: 422 if (pTpDec != NULL) { 423 crcReg1 = transportDec_CrcStartReg(pTpDec, 0); 424 } 425 break; 426 427 /* Non data cases */ 428 case next_channel: 429 ch = (ch + 1) % numberOfChannels; 430 break; 431 case link_sequence: 432 list = list->next[decision_bit]; 433 i=-1; 434 break; 435 436 default: 437 error = AAC_DEC_UNSUPPORTED_FORMAT; 438 break; 439 } 440 441 if (error != AAC_DEC_OK) { 442 goto bail; 443 } 444 445 i++; 446 447 } while (list->id[i] != end_of_sequence); 448 449 bail: 450 return error; 451 } 452
