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 /***************************** MPEG-4 AAC Decoder ************************** 85 86 Author(s): Daniel Homm 87 Description: 88 89 ******************************************************************************/ 90 91 #include "tpdec_latm.h" 92 93 94 #include "FDK_bitstream.h" 95 96 97 #define TPDEC_TRACKINDEX(p,l) (2*(p) + (l)) 98 99 static 100 UINT CLatmDemux_GetValue(HANDLE_FDK_BITSTREAM bs) 101 { 102 UCHAR bytesForValue = 0, tmp = 0; 103 int value = 0; 104 105 bytesForValue = (UCHAR) FDKreadBits(bs,2); 106 107 for (UINT i=0; i<=bytesForValue; i++) { 108 value <<= 8; 109 tmp = (UCHAR) FDKreadBits(bs,8); 110 value += tmp; 111 } 112 113 return value; 114 } 115 116 117 static 118 TRANSPORTDEC_ERROR CLatmDemux_ReadAudioMuxElement( 119 HANDLE_FDK_BITSTREAM bs, 120 CLatmDemux *pLatmDemux, 121 int m_muxConfigPresent, 122 CSTpCallBacks *pTpDecCallbacks, 123 CSAudioSpecificConfig *pAsc, 124 int *pfConfigFound 125 ) 126 { 127 TRANSPORTDEC_ERROR ErrorStatus = TRANSPORTDEC_OK; 128 129 if (m_muxConfigPresent) { 130 pLatmDemux->m_useSameStreamMux = FDKreadBits(bs,1); 131 132 if (!pLatmDemux->m_useSameStreamMux) { 133 if ((ErrorStatus = CLatmDemux_ReadStreamMuxConfig(bs, pLatmDemux, pTpDecCallbacks, pAsc, pfConfigFound))) { 134 return (ErrorStatus); 135 } 136 } 137 } 138 139 /* If there was no configuration read, its not possible to parse PayloadLengthInfo below. */ 140 if (! *pfConfigFound) { 141 return TRANSPORTDEC_SYNC_ERROR; 142 } 143 144 if (pLatmDemux->m_AudioMuxVersionA == 0) { 145 /* Do only once per call, because parsing and decoding is done in-line. */ 146 if ((ErrorStatus = CLatmDemux_ReadPayloadLengthInfo(bs,pLatmDemux))) { 147 return (ErrorStatus); 148 } 149 } else { 150 /* audioMuxVersionA > 0 is reserved for future extensions */ 151 ErrorStatus = TRANSPORTDEC_UNSUPPORTED_FORMAT; 152 } 153 154 return (ErrorStatus); 155 } 156 157 TRANSPORTDEC_ERROR CLatmDemux_Read( 158 HANDLE_FDK_BITSTREAM bs, 159 CLatmDemux *pLatmDemux, 160 TRANSPORT_TYPE tt, 161 CSTpCallBacks *pTpDecCallbacks, 162 CSAudioSpecificConfig *pAsc, 163 int *pfConfigFound, 164 const INT ignoreBufferFullness 165 ) 166 { 167 UINT cntBits; 168 UINT cmpBufferFullness; 169 UINT audioMuxLengthBytesLast = 0; 170 TRANSPORTDEC_ERROR ErrorStatus = TRANSPORTDEC_OK; 171 172 cntBits = FDKgetValidBits(bs); 173 174 if ((INT)cntBits < MIN_LATM_HEADERLENGTH) { 175 return TRANSPORTDEC_NOT_ENOUGH_BITS; 176 } 177 178 if ((ErrorStatus = CLatmDemux_ReadAudioMuxElement(bs, pLatmDemux, (tt != TT_MP4_LATM_MCP0), pTpDecCallbacks, pAsc, pfConfigFound))) 179 return (ErrorStatus); 180 181 if (!ignoreBufferFullness) 182 { 183 cmpBufferFullness = 24+audioMuxLengthBytesLast*8 184 + pLatmDemux->m_linfo[0][0].m_bufferFullness* pAsc[TPDEC_TRACKINDEX(0,0)].m_channelConfiguration*32; 185 186 /* evaluate buffer fullness */ 187 188 if (pLatmDemux->m_linfo[0][0].m_bufferFullness != 0xFF) 189 { 190 if (!pLatmDemux->BufferFullnessAchieved) 191 { 192 if (cntBits < cmpBufferFullness) 193 { 194 /* condition for start of decoding is not fulfilled */ 195 196 /* the current frame will not be decoded */ 197 return TRANSPORTDEC_NOT_ENOUGH_BITS; 198 } 199 else 200 { 201 pLatmDemux->BufferFullnessAchieved = 1; 202 } 203 } 204 } 205 } 206 207 return (ErrorStatus); 208 } 209 210 211 TRANSPORTDEC_ERROR CLatmDemux_ReadStreamMuxConfig( 212 HANDLE_FDK_BITSTREAM bs, 213 CLatmDemux *pLatmDemux, 214 CSTpCallBacks *pTpDecCallbacks, 215 CSAudioSpecificConfig *pAsc, 216 int * pfConfigFound 217 ) 218 { 219 LATM_LAYER_INFO *p_linfo = NULL; 220 TRANSPORTDEC_ERROR ErrorStatus = TRANSPORTDEC_OK; 221 222 pLatmDemux->m_AudioMuxVersion = FDKreadBits(bs,1); 223 224 if (pLatmDemux->m_AudioMuxVersion == 0) { 225 pLatmDemux->m_AudioMuxVersionA = 0; 226 } else { 227 pLatmDemux->m_AudioMuxVersionA = FDKreadBits(bs,1); 228 } 229 230 if (pLatmDemux->m_AudioMuxVersionA == 0) { 231 if (pLatmDemux->m_AudioMuxVersion == 1) { 232 pLatmDemux->m_taraBufferFullness = CLatmDemux_GetValue(bs); 233 } 234 pLatmDemux->m_allStreamsSameTimeFraming = FDKreadBits(bs,1); 235 pLatmDemux->m_noSubFrames = FDKreadBits(bs,6) + 1; 236 pLatmDemux->m_numProgram = FDKreadBits(bs,4) + 1; 237 238 if (pLatmDemux->m_numProgram > 1) { 239 return TRANSPORTDEC_UNSUPPORTED_FORMAT; 240 } 241 242 int idCnt = 0; 243 for (UINT prog = 0; prog < pLatmDemux->m_numProgram; prog++) { 244 pLatmDemux->m_numLayer = FDKreadBits(bs,3) + 1; 245 if (pLatmDemux->m_numLayer > 2) { 246 return TRANSPORTDEC_UNSUPPORTED_FORMAT; 247 } 248 249 for (UINT lay = 0; lay < pLatmDemux->m_numLayer; lay++) { 250 p_linfo = &pLatmDemux->m_linfo[prog][lay]; 251 252 p_linfo->m_streamID = idCnt++; 253 p_linfo->m_frameLengthInBits = 0; 254 255 if( (prog == 0) && (lay == 0) ) { 256 pLatmDemux->m_useSameConfig = 0; 257 } else { 258 pLatmDemux->m_useSameConfig = FDKreadBits(bs,1); 259 } 260 261 if (pLatmDemux->m_useSameConfig) { 262 if (lay > 1) { 263 FDKmemcpy(&pAsc[TPDEC_TRACKINDEX(prog,lay)], &pAsc[TPDEC_TRACKINDEX(prog,lay-1)], sizeof(CSAudioSpecificConfig)); 264 } else { 265 return TRANSPORTDEC_PARSE_ERROR; 266 } 267 } else { 268 if (pLatmDemux->m_AudioMuxVersion == 1) 269 { 270 FDK_BITSTREAM tmpBs; 271 UINT ascStartPos, ascLen=0; 272 273 ascLen = CLatmDemux_GetValue(bs); 274 ascStartPos = FDKgetValidBits(bs); 275 tmpBs = *bs; 276 FDKsyncCache(&tmpBs); 277 tmpBs.hBitBuf.ValidBits = ascLen; 278 279 /* Read ASC */ 280 if ((ErrorStatus = AudioSpecificConfig_Parse(&pAsc[TPDEC_TRACKINDEX(prog,lay)], &tmpBs, 1, pTpDecCallbacks))) { 281 return (ErrorStatus); 282 } 283 *pfConfigFound = 1; 284 285 /* The field p_linfo->m_ascLen could be wrong, so check if */ 286 if ( 0 > (INT)FDKgetValidBits(&tmpBs)) { 287 return TRANSPORTDEC_PARSE_ERROR; 288 } 289 FDKpushFor(bs, ascLen); /* position bitstream after ASC */ 290 } 291 else { 292 /* Read ASC */ 293 if ((ErrorStatus = AudioSpecificConfig_Parse(&pAsc[TPDEC_TRACKINDEX(prog,lay)], bs, 0, pTpDecCallbacks))) { 294 return (ErrorStatus); 295 } 296 } 297 { 298 int cbError; 299 300 cbError = pTpDecCallbacks->cbUpdateConfig(pTpDecCallbacks->cbUpdateConfigData, &pAsc[TPDEC_TRACKINDEX(prog,lay)]); 301 if (cbError != 0) { 302 return TRANSPORTDEC_UNKOWN_ERROR; 303 } 304 *pfConfigFound = 1; 305 } 306 } 307 308 p_linfo->m_frameLengthType = FDKreadBits(bs,3); 309 switch( p_linfo->m_frameLengthType ) { 310 case 0: 311 p_linfo->m_bufferFullness = FDKreadBits(bs,8); 312 313 if (!pLatmDemux->m_allStreamsSameTimeFraming) { 314 if ((lay > 0) && (pAsc[TPDEC_TRACKINDEX(prog,lay)].m_aot == AOT_AAC_SCAL || pAsc[TPDEC_TRACKINDEX(prog,lay)].m_aot == AOT_ER_AAC_SCAL)) { 315 return TRANSPORTDEC_UNSUPPORTED_FORMAT; 316 } 317 } 318 break; 319 case 1: 320 /* frameLength = FDKreadBits(bs,9); */ 321 case 3: 322 case 4: 323 case 5: 324 /* CELP */ 325 case 6: 326 case 7: 327 /* HVXC */ 328 default: 329 return TRANSPORTDEC_PARSE_ERROR; //_LATM_INVALIDFRAMELENGTHTYPE; 330 331 } /* switch framelengthtype*/ 332 333 } /* layer loop */ 334 } /* prog loop */ 335 336 pLatmDemux->m_otherDataPresent = FDKreadBits(bs,1); 337 pLatmDemux->m_otherDataLength = 0; 338 339 if (pLatmDemux->m_otherDataPresent) { 340 int otherDataLenEsc = 0; 341 do { 342 pLatmDemux->m_otherDataLength <<= 8; // *= 256 343 otherDataLenEsc = FDKreadBits(bs,1); 344 pLatmDemux->m_otherDataLength += FDKreadBits(bs,8); 345 } while (otherDataLenEsc); 346 } 347 348 pLatmDemux->m_crcCheckPresent = FDKreadBits(bs,1); 349 pLatmDemux->m_crcCheckSum = 0; 350 351 if (pLatmDemux->m_crcCheckPresent) { 352 pLatmDemux->m_crcCheckSum = FDKreadBits(bs,8); 353 } 354 355 } 356 else { 357 /* audioMuxVersionA > 0 is reserved for future extensions */ 358 ErrorStatus = TRANSPORTDEC_UNSUPPORTED_FORMAT; 359 } 360 return (ErrorStatus); 361 } 362 363 TRANSPORTDEC_ERROR CLatmDemux_ReadPayloadLengthInfo(HANDLE_FDK_BITSTREAM bs, CLatmDemux *pLatmDemux) 364 { 365 TRANSPORTDEC_ERROR ErrorStatus = TRANSPORTDEC_OK; 366 int totalPayloadBits = 0; 367 368 if( pLatmDemux->m_allStreamsSameTimeFraming == 1 ) { 369 for (UINT prog=0; prog<pLatmDemux->m_numProgram; prog++ ) { 370 for (UINT lay=0; lay<pLatmDemux->m_numLayer; lay++ ) { 371 LATM_LAYER_INFO *p_linfo = &pLatmDemux->m_linfo[prog][lay]; 372 373 switch (p_linfo->m_frameLengthType ) { 374 case 0: 375 p_linfo->m_frameLengthInBits = CLatmDemux_ReadAuChunkLengthInfo(bs); 376 totalPayloadBits += p_linfo->m_frameLengthInBits; 377 break; 378 case 3: 379 case 5: 380 case 7: 381 default: 382 return TRANSPORTDEC_PARSE_ERROR; //AAC_DEC_LATM_INVALIDFRAMELENGTHTYPE; 383 } 384 } 385 } 386 } 387 else { 388 ErrorStatus = TRANSPORTDEC_PARSE_ERROR; //AAC_DEC_LATM_TIMEFRAMING; 389 } 390 if (pLatmDemux->m_audioMuxLengthBytes > (UINT)0 && totalPayloadBits > (int)pLatmDemux->m_audioMuxLengthBytes*8) { 391 return TRANSPORTDEC_PARSE_ERROR; 392 } 393 return (ErrorStatus); 394 } 395 396 int CLatmDemux_ReadAuChunkLengthInfo(HANDLE_FDK_BITSTREAM bs) 397 { 398 UCHAR endFlag; 399 int len = 0; 400 401 do { 402 UCHAR tmp = (UCHAR) FDKreadBits(bs,8); 403 endFlag = (tmp < 255); 404 405 len += tmp; 406 407 } while( endFlag == 0 ); 408 409 len <<= 3; /* convert from bytes to bits */ 410 411 return len; 412 } 413 414 int CLatmDemux_GetFrameLengthInBits(CLatmDemux *pLatmDemux) 415 { 416 return pLatmDemux->m_linfo[0][0].m_frameLengthInBits; 417 } 418 419 int CLatmDemux_GetOtherDataPresentFlag(CLatmDemux *pLatmDemux) 420 { 421 return pLatmDemux->m_otherDataPresent ? 1 : 0; 422 } 423 424 int CLatmDemux_GetOtherDataLength(CLatmDemux *pLatmDemux) 425 { 426 return pLatmDemux->m_otherDataLength; 427 } 428 429 UINT CLatmDemux_GetNrOfSubFrames(CLatmDemux *pLatmDemux) 430 { 431 return pLatmDemux->m_noSubFrames; 432 } 433 434
