1 /* ----------------------------------------------------------------------------- 2 Software License for The Fraunhofer FDK AAC Codec Library for Android 3 4 Copyright 1995 - 2018 Fraunhofer-Gesellschaft zur Frderung der angewandten 5 Forschung e.V. All rights reserved. 6 7 1. INTRODUCTION 8 The Fraunhofer FDK AAC Codec Library for Android ("FDK AAC Codec") is software 9 that implements the MPEG Advanced Audio Coding ("AAC") encoding and decoding 10 scheme for digital audio. This FDK AAC Codec software is intended to be used on 11 a wide variety of Android devices. 12 13 AAC's HE-AAC and HE-AAC v2 versions are regarded as today's most efficient 14 general perceptual audio codecs. AAC-ELD is considered the best-performing 15 full-bandwidth communications codec by independent studies and is widely 16 deployed. AAC has been standardized by ISO and IEC as part of the MPEG 17 specifications. 18 19 Patent licenses for necessary patent claims for the FDK AAC Codec (including 20 those of Fraunhofer) may be obtained through Via Licensing 21 (www.vialicensing.com) or through the respective patent owners individually for 22 the purpose of encoding or decoding bit streams in products that are compliant 23 with the ISO/IEC MPEG audio standards. Please note that most manufacturers of 24 Android devices already license these patent claims through Via Licensing or 25 directly from the patent owners, and therefore FDK AAC Codec software may 26 already be covered under those patent licenses when it is used for those 27 licensed purposes only. 28 29 Commercially-licensed AAC software libraries, including floating-point versions 30 with enhanced sound quality, are also available from Fraunhofer. Users are 31 encouraged to check the Fraunhofer website for additional applications 32 information and documentation. 33 34 2. COPYRIGHT LICENSE 35 36 Redistribution and use in source and binary forms, with or without modification, 37 are permitted without payment of copyright license fees provided that you 38 satisfy the following conditions: 39 40 You must retain the complete text of this software license in redistributions of 41 the FDK AAC Codec or your modifications thereto in source code form. 42 43 You must retain the complete text of this software license in the documentation 44 and/or other materials provided with redistributions of the FDK AAC Codec or 45 your modifications thereto in binary form. You must make available free of 46 charge copies of the complete source code of the FDK AAC Codec and your 47 modifications thereto to recipients of copies in binary form. 48 49 The name of Fraunhofer may not be used to endorse or promote products derived 50 from this library without prior written permission. 51 52 You may not charge copyright license fees for anyone to use, copy or distribute 53 the FDK AAC Codec software or your modifications thereto. 54 55 Your modified versions of the FDK AAC Codec must carry prominent notices stating 56 that you changed the software and the date of any change. For modified versions 57 of the FDK AAC Codec, the term "Fraunhofer FDK AAC Codec Library for Android" 58 must be replaced by the term "Third-Party Modified Version of the Fraunhofer FDK 59 AAC Codec Library for Android." 60 61 3. NO PATENT LICENSE 62 63 NO EXPRESS OR IMPLIED LICENSES TO ANY PATENT CLAIMS, including without 64 limitation the patents of Fraunhofer, ARE GRANTED BY THIS SOFTWARE LICENSE. 65 Fraunhofer provides no warranty of patent non-infringement with respect to this 66 software. 67 68 You may use this FDK AAC Codec software or modifications thereto only for 69 purposes that are authorized by appropriate patent licenses. 70 71 4. DISCLAIMER 72 73 This FDK AAC Codec software is provided by Fraunhofer on behalf of the copyright 74 holders and contributors "AS IS" and WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, 75 including but not limited to the implied warranties of merchantability and 76 fitness for a particular purpose. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR 77 CONTRIBUTORS BE LIABLE for any direct, indirect, incidental, special, exemplary, 78 or consequential damages, including but not limited to procurement of substitute 79 goods or services; loss of use, data, or profits, or business interruption, 80 however caused and on any theory of liability, whether in contract, strict 81 liability, or tort (including negligence), arising in any way out of the use of 82 this software, even if advised of the possibility of such damage. 83 84 5. CONTACT INFORMATION 85 86 Fraunhofer Institute for Integrated Circuits IIS 87 Attention: Audio and Multimedia Departments - FDK AAC LL 88 Am Wolfsmantel 33 89 91058 Erlangen, Germany 90 91 www.iis.fraunhofer.de/amm 92 amm-info (at) iis.fraunhofer.de 93 ----------------------------------------------------------------------------- */ 94 95 /************************* System integration library ************************** 96 97 Author(s): Thomas Dietzen 98 99 Description: 100 101 *******************************************************************************/ 102 103 /** \file syslib_channelMapDescr.cpp 104 * \brief Implementation of routines that handle the channel map descriptor. 105 */ 106 107 #include "syslib_channelMapDescr.h" 108 109 #define DFLT_CH_MAP_TAB_LEN \ 110 (15) /* Length of the default channel map info table. */ 111 112 /** 113 * \brief The following arrays provide a channel map for each channel config (0 114 * to 14). 115 * 116 * The i-th channel will be mapped to the postion a[i-1]+1 117 * with i>0 and a[] is one of the following mapping arrays. 118 */ 119 static const UCHAR mapFallback[] = {0, 1, 2, 3, 4, 5, 6, 7, 120 8, 9, 10, 11, 12, 13, 14, 15, 121 16, 17, 18, 19, 20, 21, 22, 23}; 122 static const UCHAR mapCfg1[] = {0, 1}; 123 static const UCHAR mapCfg2[] = {0, 1}; 124 static const UCHAR mapCfg3[] = {2, 0, 1}; 125 static const UCHAR mapCfg4[] = {2, 0, 1, 3}; 126 static const UCHAR mapCfg5[] = {2, 0, 1, 3, 4}; 127 static const UCHAR mapCfg6[] = {2, 0, 1, 4, 5, 3}; 128 static const UCHAR mapCfg7[] = {2, 6, 7, 0, 1, 4, 5, 3}; 129 static const UCHAR mapCfg11[] = {2, 0, 1, 4, 5, 6, 3}; 130 static const UCHAR mapCfg12[] = {2, 0, 1, 6, 7, 4, 5, 3}; 131 static const UCHAR mapCfg13[] = {2, 6, 7, 0, 1, 10, 11, 4, 132 5, 8, 3, 9, 14, 12, 13, 18, 133 19, 15, 16, 17, 20, 21, 22, 23}; 134 static const UCHAR mapCfg14[] = {2, 0, 1, 4, 5, 3, 6, 7}; 135 136 /** 137 * \brief Default table comprising channel map information for each channel 138 * config (0 to 14). 139 */ 140 static const CHANNEL_MAP_INFO mapInfoTabDflt[DFLT_CH_MAP_TAB_LEN] = 141 {/* chCfg, map, numCh */ 142 /* 0 */ {mapFallback, 24}, 143 /* 1 */ {mapCfg1, 2}, 144 /* 2 */ {mapCfg2, 2}, 145 /* 3 */ {mapCfg3, 3}, 146 /* 4 */ {mapCfg4, 4}, 147 /* 5 */ {mapCfg5, 5}, 148 /* 6 */ {mapCfg6, 6}, 149 /* 7 */ {mapCfg7, 8}, 150 /* 8 */ {mapFallback, 24}, 151 /* 9 */ {mapFallback, 24}, 152 /* 10 */ {mapFallback, 24}, 153 /* 11 */ {mapCfg11, 7}, 154 /* 12 */ {mapCfg12, 8}, 155 /* 13 */ {mapCfg13, 24}, 156 /* 14 */ {mapCfg14, 8}}; 157 158 /** 159 * Get the mapping value for a specific channel and map index. 160 */ 161 UCHAR FDK_chMapDescr_getMapValue(const FDK_channelMapDescr* const pMapDescr, 162 const UCHAR chIdx, const UINT mapIdx) { 163 UCHAR mapValue = chIdx; /* Pass through by default. */ 164 165 FDK_ASSERT(pMapDescr != NULL); 166 167 if ((pMapDescr->fPassThrough == 0) && (pMapDescr->pMapInfoTab != NULL) && 168 (pMapDescr->mapInfoTabLen > mapIdx)) { /* Nest sanity check to avoid 169 possible memory access 170 violation. */ 171 if (chIdx < pMapDescr->pMapInfoTab[mapIdx].numChannels) { 172 mapValue = pMapDescr->pMapInfoTab[mapIdx].pChannelMap[chIdx]; 173 } 174 } 175 return mapValue; 176 } 177 178 /** 179 * \brief Evaluate whether single channel map is reasonable or not. 180 * 181 * \param pMapInfo Pointer to channel map. 182 * \return Value unequal to zero if map is valid, otherwise zero. 183 */ 184 static int fdk_chMapDescr_isValidMap(const CHANNEL_MAP_INFO* const pMapInfo) { 185 int result = 1; 186 UINT i; 187 188 if (pMapInfo == NULL) { 189 result = 0; 190 } else { 191 UINT numChannels = pMapInfo->numChannels; 192 193 /* Check for all map values if they are inside the range 0 to numChannels-1 194 * and unique. */ 195 if (numChannels < 32) { /* Optimized version for less than 32 channels. 196 Needs only one loop. */ 197 UINT mappedChMask = 0x0; 198 for (i = 0; i < numChannels; i += 1) { 199 mappedChMask |= 1 << pMapInfo->pChannelMap[i]; 200 } 201 if (mappedChMask != (((UINT)1 << numChannels) - 1)) { 202 result = 0; 203 } 204 } else { /* General case that can handle all number of channels but needs 205 one more loop. */ 206 for (i = 0; (i < numChannels) && result; i += 1) { 207 UINT j; 208 UCHAR value0 = pMapInfo->pChannelMap[i]; 209 210 if (value0 > numChannels - 1) { /* out of range? */ 211 result = 0; 212 } 213 for (j = numChannels - 1; (j > i) && result; j -= 1) { 214 if (value0 == pMapInfo->pChannelMap[j]) { /* not unique */ 215 result = 0; 216 } 217 } 218 } 219 } 220 } 221 222 return result; 223 } 224 225 /** 226 * Evaluate whether channel map descriptor is reasonable or not. 227 */ 228 int FDK_chMapDescr_isValid(const FDK_channelMapDescr* const pMapDescr) { 229 int result = 0; 230 UINT i; 231 232 if (pMapDescr != NULL) { 233 result = 1; 234 for (i = 0; (i < pMapDescr->mapInfoTabLen) && result; i += 1) { 235 if (!fdk_chMapDescr_isValidMap(&pMapDescr->pMapInfoTab[i])) { 236 result = 0; 237 } 238 } 239 } 240 return result; 241 } 242 243 /** 244 * Initialize the complete channel map descriptor. 245 */ 246 void FDK_chMapDescr_init(FDK_channelMapDescr* const pMapDescr, 247 const CHANNEL_MAP_INFO* const pMapInfoTab, 248 const UINT mapInfoTabLen, const UINT fPassThrough) { 249 if (pMapDescr != NULL) { 250 int useDefaultTab = 1; 251 252 pMapDescr->fPassThrough = (fPassThrough == 0) ? 0 : 1; 253 254 if ((pMapInfoTab != NULL) && (mapInfoTabLen > 0)) { 255 /* Set the valid custom mapping table. */ 256 pMapDescr->pMapInfoTab = pMapInfoTab; 257 pMapDescr->mapInfoTabLen = mapInfoTabLen; 258 /* Validate the complete descriptor. */ 259 useDefaultTab = (FDK_chMapDescr_isValid(pMapDescr) == 0) ? 1 : 0; 260 } 261 if (useDefaultTab != 0) { 262 /* Set default table. */ 263 pMapDescr->pMapInfoTab = mapInfoTabDflt; 264 pMapDescr->mapInfoTabLen = DFLT_CH_MAP_TAB_LEN; 265 } 266 } 267 } 268 269 /** 270 * Set channel mapping bypass flag in a given channel map descriptor. 271 */ 272 int FDK_chMapDescr_setPassThrough(FDK_channelMapDescr* const pMapDescr, 273 UINT fPassThrough) { 274 int err = 1; 275 276 if (pMapDescr != NULL) { 277 if ((pMapDescr->pMapInfoTab != NULL) && (pMapDescr->mapInfoTabLen > 0)) { 278 pMapDescr->fPassThrough = (fPassThrough == 0) ? 0 : 1; 279 err = 0; 280 } 281 } 282 283 return err; 284 } 285