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 /*! 85 \file 86 \brief Remaining SBR Bit Writing Routines 87 */ 88 89 #include "env_bit.h" 90 #include "cmondata.h" 91 92 93 #ifndef min 94 #define min(a,b) ( a < b ? a:b) 95 #endif 96 97 #ifndef max 98 #define max(a,b) ( a > b ? a:b) 99 #endif 100 101 /* ***************************** crcAdvance **********************************/ 102 /** 103 * @fn 104 * @brief updates crc data register 105 * @return none 106 * 107 * This function updates the crc register 108 * 109 */ 110 static void crcAdvance(USHORT crcPoly, 111 USHORT crcMask, 112 USHORT *crc, 113 ULONG bValue, 114 INT bBits 115 ) 116 { 117 INT i; 118 USHORT flag; 119 120 for (i=bBits-1; i>=0; i--) { 121 flag = ((*crc) & crcMask) ? (1) : (0) ; 122 flag ^= (bValue & (1<<i)) ? (1) : (0) ; 123 124 (*crc)<<=1; 125 if(flag) (*crc) ^= crcPoly; 126 } 127 } 128 129 130 /* ***************************** FDKsbrEnc_InitSbrBitstream **********************************/ 131 /** 132 * @fn 133 * @brief Inittialisation of sbr bitstream, write of dummy header and CRC 134 * @return none 135 * 136 * 137 * 138 */ 139 140 INT FDKsbrEnc_InitSbrBitstream(HANDLE_COMMON_DATA hCmonData, 141 UCHAR *memoryBase, /*!< Pointer to bitstream buffer */ 142 INT memorySize, /*!< Length of bitstream buffer in bytes */ 143 HANDLE_FDK_CRCINFO hCrcInfo, 144 UINT sbrSyntaxFlags) /*!< SBR syntax flags */ 145 { 146 INT crcRegion = 0; 147 148 /* reset bit buffer */ 149 FDKresetBitbuffer(&hCmonData->sbrBitbuf, BS_WRITER); 150 151 FDKinitBitStream(&hCmonData->tmpWriteBitbuf, memoryBase, 152 memorySize, 0, BS_WRITER); 153 154 if (sbrSyntaxFlags & SBR_SYNTAX_CRC) { 155 if (sbrSyntaxFlags & SBR_SYNTAX_DRM_CRC) 156 { /* Init and start CRC region */ 157 FDKwriteBits (&hCmonData->sbrBitbuf, 0x0, SI_SBR_DRM_CRC_BITS); 158 FDKcrcInit( hCrcInfo, 0x001d, 0xFFFF, SI_SBR_DRM_CRC_BITS ); 159 crcRegion = FDKcrcStartReg( hCrcInfo, &hCmonData->sbrBitbuf, 0 ); 160 } else { 161 FDKwriteBits (&hCmonData->sbrBitbuf, 0x0, SI_SBR_CRC_BITS); 162 } 163 } 164 165 return (crcRegion); 166 } 167 168 169 /* ************************** FDKsbrEnc_AssembleSbrBitstream *******************************/ 170 /** 171 * @fn 172 * @brief Formats the SBR payload 173 * @return nothing 174 * 175 * Also the CRC will be calculated here. 176 * 177 */ 178 179 void 180 FDKsbrEnc_AssembleSbrBitstream( HANDLE_COMMON_DATA hCmonData, 181 HANDLE_FDK_CRCINFO hCrcInfo, 182 INT crcRegion, 183 UINT sbrSyntaxFlags) 184 { 185 USHORT crcReg = SBR_CRCINIT; 186 INT numCrcBits,i; 187 188 /* check if SBR is present */ 189 if ( hCmonData==NULL ) 190 return; 191 192 hCmonData->sbrFillBits = 0; /* Fill bits are written only for GA streams */ 193 194 if ( sbrSyntaxFlags & SBR_SYNTAX_DRM_CRC ) 195 { 196 /* 197 * Calculate and write DRM CRC 198 */ 199 FDKcrcEndReg( hCrcInfo, &hCmonData->sbrBitbuf, crcRegion ); 200 FDKwriteBits( &hCmonData->tmpWriteBitbuf, FDKcrcGetCRC(hCrcInfo)^0xFF, SI_SBR_DRM_CRC_BITS ); 201 } 202 else 203 { 204 if ( !(sbrSyntaxFlags & SBR_SYNTAX_LOW_DELAY) ) 205 { 206 /* Do alignment here, because its defined as part of the sbr_extension_data */ 207 int sbrLoad = hCmonData->sbrHdrBits + hCmonData->sbrDataBits; 208 209 if ( sbrSyntaxFlags & SBR_SYNTAX_CRC ) { 210 sbrLoad += SI_SBR_CRC_BITS; 211 } 212 213 sbrLoad += 4; /* Do byte Align with 4 bit offset. ISO/IEC 14496-3:2005(E) page 39. */ 214 215 hCmonData->sbrFillBits = (8 - (sbrLoad % 8)) % 8; 216 217 /* 218 append fill bits 219 */ 220 FDKwriteBits(&hCmonData->sbrBitbuf, 0, hCmonData->sbrFillBits ); 221 222 FDK_ASSERT(FDKgetValidBits(&hCmonData->sbrBitbuf) % 8 == 4); 223 } 224 225 /* 226 calculate crc 227 */ 228 if ( sbrSyntaxFlags & SBR_SYNTAX_CRC ) { 229 FDK_BITSTREAM tmpCRCBuf = hCmonData->sbrBitbuf; 230 FDKresetBitbuffer( &tmpCRCBuf, BS_READER ); 231 232 numCrcBits = hCmonData->sbrHdrBits + hCmonData->sbrDataBits + hCmonData->sbrFillBits; 233 234 for(i=0;i<numCrcBits;i++){ 235 INT bit; 236 bit = FDKreadBits(&tmpCRCBuf,1); 237 crcAdvance(SBR_CRC_POLY,SBR_CRC_MASK,&crcReg,bit,1); 238 } 239 crcReg &= (SBR_CRC_RANGE); 240 241 /* 242 * Write CRC data. 243 */ 244 FDKwriteBits (&hCmonData->tmpWriteBitbuf, crcReg, SI_SBR_CRC_BITS); 245 } 246 } 247 248 FDKsyncCache(&hCmonData->tmpWriteBitbuf); 249 } 250 251
