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): Josef Hoepfl 87 Description: individual channel stream info 88 89 ******************************************************************************/ 90 91 #include "channelinfo.h" 92 #include "aac_rom.h" 93 #include "aac_ram.h" 94 #include "FDK_bitstream.h" 95 96 97 AAC_DECODER_ERROR IcsReadMaxSfb ( 98 HANDLE_FDK_BITSTREAM bs, 99 CIcsInfo *pIcsInfo, 100 const SamplingRateInfo *pSamplingRateInfo 101 ) 102 { 103 AAC_DECODER_ERROR ErrorStatus = AAC_DEC_OK; 104 int nbits; 105 106 if (IsLongBlock(pIcsInfo)) { 107 nbits = 6; 108 pIcsInfo->TotalSfBands = pSamplingRateInfo->NumberOfScaleFactorBands_Long; 109 } else { 110 nbits = 4; 111 pIcsInfo->TotalSfBands = pSamplingRateInfo->NumberOfScaleFactorBands_Short; 112 } 113 pIcsInfo->MaxSfBands = (UCHAR) FDKreadBits(bs, nbits); 114 115 if (pIcsInfo->MaxSfBands > pIcsInfo->TotalSfBands){ 116 ErrorStatus = AAC_DEC_PARSE_ERROR; 117 } 118 119 return ErrorStatus; 120 } 121 122 123 124 AAC_DECODER_ERROR IcsRead(HANDLE_FDK_BITSTREAM bs, 125 CIcsInfo *pIcsInfo, 126 const SamplingRateInfo* pSamplingRateInfo, 127 const UINT flags) 128 { 129 AAC_DECODER_ERROR ErrorStatus = AAC_DEC_OK; 130 131 pIcsInfo->Valid = 0; 132 133 if (flags & AC_ELD){ 134 pIcsInfo->WindowSequence = OnlyLongSequence; 135 pIcsInfo->WindowShape = 0; 136 } 137 else { 138 if ( !(flags & (AC_USAC|AC_RSVD50)) ) { 139 FDKreadBits(bs,1); 140 } 141 pIcsInfo->WindowSequence = (UCHAR) FDKreadBits(bs,2); 142 pIcsInfo->WindowShape = (UCHAR) FDKreadBits(bs,1); 143 if (flags & AC_LD) { 144 if (pIcsInfo->WindowShape) { 145 pIcsInfo->WindowShape = 2; /* select low overlap instead of KBD */ 146 } 147 } 148 } 149 150 /* Sanity check */ 151 if ( (flags & (AC_ELD|AC_LD)) && pIcsInfo->WindowSequence != OnlyLongSequence) { 152 pIcsInfo->WindowSequence = OnlyLongSequence; 153 ErrorStatus = AAC_DEC_PARSE_ERROR; 154 goto bail; 155 } 156 157 ErrorStatus = IcsReadMaxSfb(bs, pIcsInfo, pSamplingRateInfo); 158 if (ErrorStatus != AAC_DEC_OK) { 159 goto bail; 160 } 161 162 if (IsLongBlock(pIcsInfo)) 163 { 164 if ( !(flags & (AC_ELD|AC_SCALABLE|AC_BSAC|AC_USAC|AC_RSVD50)) ) /* If not ELD nor Scalable nor BSAC nor USAC syntax then ... */ 165 { 166 if ((UCHAR)FDKreadBits(bs,1) != 0 ) /* UCHAR PredictorDataPresent */ 167 { 168 ErrorStatus = AAC_DEC_UNSUPPORTED_PREDICTION; 169 goto bail; 170 } 171 } 172 173 pIcsInfo->WindowGroups = 1; 174 pIcsInfo->WindowGroupLength[0] = 1; 175 } 176 else 177 { 178 INT i; 179 UINT mask; 180 181 pIcsInfo->ScaleFactorGrouping = (UCHAR) FDKreadBits(bs,7); 182 183 pIcsInfo->WindowGroups = 0 ; 184 185 for (i=0; i < (8-1); i++) 186 { 187 mask = 1 << (6 - i); 188 pIcsInfo->WindowGroupLength[i] = 1; 189 190 if (pIcsInfo->ScaleFactorGrouping & mask) 191 { 192 pIcsInfo->WindowGroupLength[pIcsInfo->WindowGroups]++; 193 } 194 else 195 { 196 pIcsInfo->WindowGroups++; 197 } 198 } 199 200 /* loop runs to i < 7 only */ 201 pIcsInfo->WindowGroupLength[8-1] = 1; 202 pIcsInfo->WindowGroups++; 203 } 204 205 206 bail: 207 if (ErrorStatus == AAC_DEC_OK) 208 pIcsInfo->Valid = 1; 209 210 return ErrorStatus; 211 } 212 213 214 /* 215 interleave codebooks the following way 216 217 9 (84w) | 1 (51w) 218 10 (82w) | 2 (39w) 219 SCL (65w) | 4 (38w) 220 3 (39w) | 5 (41w) 221 | 6 (40w) 222 | 7 (31w) 223 | 8 (31w) 224 (270w) (271w) 225 */ 226 227 228 /* 229 Table entries are sorted as following: 230 | num_swb_long_window | sfbands_long | num_swb_short_window | sfbands_short | 231 */ 232 AAC_DECODER_ERROR getSamplingRateInfo( 233 SamplingRateInfo *t, 234 UINT samplesPerFrame, 235 UINT samplingRateIndex, 236 UINT samplingRate 237 ) 238 { 239 int index = 0; 240 241 242 t->samplingRateIndex = samplingRateIndex; 243 t->samplingRate = samplingRate; 244 245 switch (samplesPerFrame) { 246 case 1024: 247 index = 0; 248 break; 249 case 960: 250 index = 1; 251 break; 252 case 512: 253 index = 3; 254 break; 255 case 480: 256 index = 4; 257 break; 258 259 default: 260 return AAC_DEC_UNSUPPORTED_FORMAT; 261 } 262 263 t->ScaleFactorBands_Long = sfbOffsetTables[index][samplingRateIndex].sfbOffsetLong; 264 t->ScaleFactorBands_Short = sfbOffsetTables[index][samplingRateIndex].sfbOffsetShort; 265 t->NumberOfScaleFactorBands_Long = sfbOffsetTables[index][samplingRateIndex].numberOfSfbLong; 266 t->NumberOfScaleFactorBands_Short = sfbOffsetTables[index][samplingRateIndex].numberOfSfbShort; 267 268 if (t->ScaleFactorBands_Long == NULL || t->NumberOfScaleFactorBands_Long == 0) { 269 return AAC_DEC_UNSUPPORTED_FORMAT; 270 } 271 272 FDK_ASSERT(t->ScaleFactorBands_Long[t->NumberOfScaleFactorBands_Long] == samplesPerFrame); 273 FDK_ASSERT(t->ScaleFactorBands_Short == NULL || t->ScaleFactorBands_Short[t->NumberOfScaleFactorBands_Short]*8 == samplesPerFrame); 274 275 return AAC_DEC_OK; 276 } 277
