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 /**************************** SBR encoder library ****************************** 96 97 Author(s): 98 99 Description: 100 101 *******************************************************************************/ 102 103 /*! 104 \file 105 \brief Remaining SBR Bit Writing Routines 106 */ 107 108 #include "env_bit.h" 109 #include "cmondata.h" 110 111 #ifndef min 112 #define min(a, b) (a < b ? a : b) 113 #endif 114 115 #ifndef max 116 #define max(a, b) (a > b ? a : b) 117 #endif 118 119 /* ***************************** crcAdvance **********************************/ 120 /** 121 * @fn 122 * @brief updates crc data register 123 * @return none 124 * 125 * This function updates the crc register 126 * 127 */ 128 static void crcAdvance(USHORT crcPoly, USHORT crcMask, USHORT *crc, 129 ULONG bValue, INT bBits) { 130 INT i; 131 USHORT flag; 132 133 for (i = bBits - 1; i >= 0; i--) { 134 flag = ((*crc) & crcMask) ? (1) : (0); 135 flag ^= (bValue & (1 << i)) ? (1) : (0); 136 137 (*crc) <<= 1; 138 if (flag) (*crc) ^= crcPoly; 139 } 140 } 141 142 /* ***************************** FDKsbrEnc_InitSbrBitstream 143 * **********************************/ 144 /** 145 * @fn 146 * @brief Inittialisation of sbr bitstream, write of dummy header and CRC 147 * @return none 148 * 149 * 150 * 151 */ 152 153 INT FDKsbrEnc_InitSbrBitstream( 154 HANDLE_COMMON_DATA hCmonData, 155 UCHAR *memoryBase, /*!< Pointer to bitstream buffer */ 156 INT memorySize, /*!< Length of bitstream buffer in bytes */ 157 HANDLE_FDK_CRCINFO hCrcInfo, UINT sbrSyntaxFlags) /*!< SBR syntax flags */ 158 { 159 INT crcRegion = 0; 160 161 /* reset bit buffer */ 162 FDKresetBitbuffer(&hCmonData->sbrBitbuf, BS_WRITER); 163 164 FDKinitBitStream(&hCmonData->tmpWriteBitbuf, memoryBase, memorySize, 0, 165 BS_WRITER); 166 167 if (sbrSyntaxFlags & SBR_SYNTAX_CRC) { 168 if (sbrSyntaxFlags & SBR_SYNTAX_DRM_CRC) { /* Init and start CRC region */ 169 FDKwriteBits(&hCmonData->sbrBitbuf, 0x0, SI_SBR_DRM_CRC_BITS); 170 FDKcrcInit(hCrcInfo, 0x001d, 0xFFFF, SI_SBR_DRM_CRC_BITS); 171 crcRegion = FDKcrcStartReg(hCrcInfo, &hCmonData->sbrBitbuf, 0); 172 } else { 173 FDKwriteBits(&hCmonData->sbrBitbuf, 0x0, SI_SBR_CRC_BITS); 174 } 175 } 176 177 return (crcRegion); 178 } 179 180 /* ************************** FDKsbrEnc_AssembleSbrBitstream 181 * *******************************/ 182 /** 183 * @fn 184 * @brief Formats the SBR payload 185 * @return nothing 186 * 187 * Also the CRC will be calculated here. 188 * 189 */ 190 191 void FDKsbrEnc_AssembleSbrBitstream(HANDLE_COMMON_DATA hCmonData, 192 HANDLE_FDK_CRCINFO hCrcInfo, INT crcRegion, 193 UINT sbrSyntaxFlags) { 194 USHORT crcReg = SBR_CRCINIT; 195 INT numCrcBits, i; 196 197 /* check if SBR is present */ 198 if (hCmonData == NULL) return; 199 200 hCmonData->sbrFillBits = 0; /* Fill bits are written only for GA streams */ 201 202 if (sbrSyntaxFlags & SBR_SYNTAX_DRM_CRC) { 203 /* 204 * Calculate and write DRM CRC 205 */ 206 FDKcrcEndReg(hCrcInfo, &hCmonData->sbrBitbuf, crcRegion); 207 FDKwriteBits(&hCmonData->tmpWriteBitbuf, FDKcrcGetCRC(hCrcInfo) ^ 0xFF, 208 SI_SBR_DRM_CRC_BITS); 209 } else { 210 if (!(sbrSyntaxFlags & SBR_SYNTAX_LOW_DELAY)) { 211 /* Do alignment here, because its defined as part of the 212 * sbr_extension_data */ 213 int sbrLoad = hCmonData->sbrHdrBits + hCmonData->sbrDataBits; 214 215 if (sbrSyntaxFlags & SBR_SYNTAX_CRC) { 216 sbrLoad += SI_SBR_CRC_BITS; 217 } 218 219 sbrLoad += 4; /* Do byte Align with 4 bit offset. ISO/IEC 14496-3:2005(E) 220 page 39. */ 221 222 hCmonData->sbrFillBits = (8 - (sbrLoad % 8)) % 8; 223 224 /* 225 append fill bits 226 */ 227 FDKwriteBits(&hCmonData->sbrBitbuf, 0, hCmonData->sbrFillBits); 228 229 FDK_ASSERT(FDKgetValidBits(&hCmonData->sbrBitbuf) % 8 == 4); 230 } 231 232 /* 233 calculate crc 234 */ 235 if (sbrSyntaxFlags & SBR_SYNTAX_CRC) { 236 FDK_BITSTREAM tmpCRCBuf = hCmonData->sbrBitbuf; 237 FDKresetBitbuffer(&tmpCRCBuf, BS_READER); 238 239 numCrcBits = hCmonData->sbrHdrBits + hCmonData->sbrDataBits + 240 hCmonData->sbrFillBits; 241 242 for (i = 0; i < numCrcBits; i++) { 243 INT bit; 244 bit = FDKreadBits(&tmpCRCBuf, 1); 245 crcAdvance(SBR_CRC_POLY, SBR_CRC_MASK, &crcReg, bit, 1); 246 } 247 crcReg &= (SBR_CRC_RANGE); 248 249 /* 250 * Write CRC data. 251 */ 252 FDKwriteBits(&hCmonData->tmpWriteBitbuf, crcReg, SI_SBR_CRC_BITS); 253 } 254 } 255 256 FDKsyncCache(&hCmonData->tmpWriteBitbuf); 257 } 258
