1 2/* ----------------------------------------------------------------------------------------------------------- 3Software License for The Fraunhofer FDK AAC Codec Library for Android 4 5© Copyright 1995 - 2012 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. 6 All rights reserved. 7 8 1. INTRODUCTION 9The Fraunhofer FDK AAC Codec Library for Android ("FDK AAC Codec") is software that implements 10the MPEG Advanced Audio Coding ("AAC") encoding and decoding scheme for digital audio. 11This FDK AAC Codec software is intended to be used on a wide variety of Android devices. 12 13AAC's HE-AAC and HE-AAC v2 versions are regarded as today's most efficient general perceptual 14audio codecs. AAC-ELD is considered the best-performing full-bandwidth communications codec by 15independent studies and is widely deployed. AAC has been standardized by ISO and IEC as part 16of the MPEG specifications. 17 18Patent licenses for necessary patent claims for the FDK AAC Codec (including those of Fraunhofer) 19may be obtained through Via Licensing (www.vialicensing.com) or through the respective patent owners 20individually for the purpose of encoding or decoding bit streams in products that are compliant with 21the ISO/IEC MPEG audio standards. Please note that most manufacturers of Android devices already license 22these patent claims through Via Licensing or directly from the patent owners, and therefore FDK AAC Codec 23software may already be covered under those patent licenses when it is used for those licensed purposes only. 24 25Commercially-licensed AAC software libraries, including floating-point versions with enhanced sound quality, 26are also available from Fraunhofer. Users are encouraged to check the Fraunhofer website for additional 27applications information and documentation. 28 292. COPYRIGHT LICENSE 30 31Redistribution and use in source and binary forms, with or without modification, are permitted without 32payment of copyright license fees provided that you satisfy the following conditions: 33 34You must retain the complete text of this software license in redistributions of the FDK AAC Codec or 35your modifications thereto in source code form. 36 37You must retain the complete text of this software license in the documentation and/or other materials 38provided with redistributions of the FDK AAC Codec or your modifications thereto in binary form. 39You must make available free of charge copies of the complete source code of the FDK AAC Codec and your 40modifications thereto to recipients of copies in binary form. 41 42The name of Fraunhofer may not be used to endorse or promote products derived from this library without 43prior written permission. 44 45You may not charge copyright license fees for anyone to use, copy or distribute the FDK AAC Codec 46software or your modifications thereto. 47 48Your modified versions of the FDK AAC Codec must carry prominent notices stating that you changed the software 49and 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." 52 533. NO PATENT LICENSE 54 55NO EXPRESS OR IMPLIED LICENSES TO ANY PATENT CLAIMS, including without limitation the patents of Fraunhofer, 56ARE GRANTED BY THIS SOFTWARE LICENSE. Fraunhofer provides no warranty of patent non-infringement with 57respect to this software. 58 59You may use this FDK AAC Codec software or modifications thereto only for purposes that are authorized 60by appropriate patent licenses. 61 624. DISCLAIMER 63 64This 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 66of merchantability and fitness for a particular purpose. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR 67CONTRIBUTORS BE LIABLE for any direct, indirect, incidental, special, exemplary, or consequential damages, 68including but not limited to procurement of substitute goods or services; loss of use, data, or profits, 69or business interruption, however caused and on any theory of liability, whether in contract, strict 70liability, or tort (including negligence), arising in any way out of the use of this software, even if 71advised of the possibility of such damage. 72 735. CONTACT INFORMATION 74 75Fraunhofer Institute for Integrated Circuits IIS 76Attention: Audio and Multimedia Departments - FDK AAC LL 77Am Wolfsmantel 33 7891058 Erlangen, Germany 79 80www.iis.fraunhofer.de/amm 81amm-info@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 97AAC_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 124AAC_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 206bail: 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*/ 232AAC_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