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 /******************* MPEG transport format encoder library ********************* 96 97 Author(s): Alex Groeschel 98 99 Description: ADTS Transport Headers support 100 101 *******************************************************************************/ 102 103 #include "tpenc_adts.h" 104 105 #include "tpenc_lib.h" 106 #include "tpenc_asc.h" 107 108 int adtsWrite_CrcStartReg( 109 HANDLE_ADTS pAdts, /*!< pointer to adts stucture */ 110 HANDLE_FDK_BITSTREAM hBs, /*!< handle to current bit buffer structure */ 111 int mBits /*!< number of bits in crc region */ 112 ) { 113 if (pAdts->protection_absent) { 114 return 0; 115 } 116 return (FDKcrcStartReg(&pAdts->crcInfo, hBs, mBits)); 117 } 118 119 void adtsWrite_CrcEndReg( 120 HANDLE_ADTS pAdts, /*!< pointer to adts crc info stucture */ 121 HANDLE_FDK_BITSTREAM hBs, /*!< handle to current bit buffer structure */ 122 int reg /*!< crc region */ 123 ) { 124 if (pAdts->protection_absent == 0) { 125 FDKcrcEndReg(&pAdts->crcInfo, hBs, reg); 126 } 127 } 128 129 int adtsWrite_GetHeaderBits(HANDLE_ADTS hAdts) { 130 int bits = 0; 131 132 if (hAdts->currentBlock == 0) { 133 /* Static and variable header bits */ 134 bits = 56; 135 if (!hAdts->protection_absent) { 136 /* Add header/ single raw data block CRC bits */ 137 bits += 16; 138 if (hAdts->num_raw_blocks > 0) { 139 /* Add bits of raw data block position markers */ 140 bits += (hAdts->num_raw_blocks) * 16; 141 } 142 } 143 } 144 if (!hAdts->protection_absent && hAdts->num_raw_blocks > 0) { 145 /* Add raw data block CRC bits. Not really part of the header, put they 146 * cause bit overhead to be accounted. */ 147 bits += 16; 148 } 149 150 hAdts->headerBits = bits; 151 152 return bits; 153 } 154 155 INT adtsWrite_Init(HANDLE_ADTS hAdts, CODER_CONFIG *config) { 156 /* Sanity checks */ 157 if (config->nSubFrames < 1 || config->nSubFrames > 4 || 158 (int)config->aot > 4 || (int)config->aot < 1) { 159 return -1; 160 } 161 162 /* fixed header */ 163 if (config->flags & CC_MPEG_ID) { 164 hAdts->mpeg_id = 0; /* MPEG 4 */ 165 } else { 166 hAdts->mpeg_id = 1; /* MPEG 2 */ 167 } 168 hAdts->layer = 0; 169 hAdts->protection_absent = !(config->flags & CC_PROTECTION); 170 hAdts->profile = ((int)config->aot) - 1; 171 hAdts->sample_freq_index = getSamplingRateIndex(config->samplingRate, 4); 172 hAdts->sample_freq = config->samplingRate; 173 hAdts->private_bit = 0; 174 hAdts->channel_mode = config->channelMode; 175 hAdts->original = 0; 176 hAdts->home = 0; 177 /* variable header */ 178 hAdts->copyright_id = 0; 179 hAdts->copyright_start = 0; 180 181 hAdts->num_raw_blocks = config->nSubFrames - 1; /* 0 means 1 raw data block */ 182 183 hAdts->channel_config_zero = config->channelConfigZero; 184 185 FDKcrcInit(&hAdts->crcInfo, 0x8005, 0xFFFF, 16); 186 187 hAdts->currentBlock = 0; 188 189 return 0; 190 } 191 192 int adtsWrite_EncodeHeader(HANDLE_ADTS hAdts, HANDLE_FDK_BITSTREAM hBitStream, 193 int buffer_fullness, int frame_length) { 194 INT crcIndex = 0; 195 196 hAdts->headerBits = adtsWrite_GetHeaderBits(hAdts); 197 198 FDK_ASSERT(((frame_length + hAdts->headerBits) / 8) < 0x2000); /*13 bit*/ 199 FDK_ASSERT(buffer_fullness < 0x800); /* 11 bit */ 200 201 if (!hAdts->protection_absent) { 202 FDKcrcReset(&hAdts->crcInfo); 203 } 204 205 if (hAdts->currentBlock == 0) { 206 FDKresetBitbuffer(hBitStream, BS_WRITER); 207 } 208 209 hAdts->subFrameStartBit = FDKgetValidBits(hBitStream); 210 211 /* Skip new header if this is raw data block 1..n */ 212 if (hAdts->currentBlock == 0) { 213 FDKresetBitbuffer(hBitStream, BS_WRITER); 214 215 if (hAdts->num_raw_blocks == 0) { 216 crcIndex = adtsWrite_CrcStartReg(hAdts, hBitStream, 0); 217 } 218 219 /* fixed header */ 220 FDKwriteBits(hBitStream, 0xFFF, 12); 221 FDKwriteBits(hBitStream, hAdts->mpeg_id, 1); 222 FDKwriteBits(hBitStream, hAdts->layer, 2); 223 FDKwriteBits(hBitStream, hAdts->protection_absent, 1); 224 FDKwriteBits(hBitStream, hAdts->profile, 2); 225 FDKwriteBits(hBitStream, hAdts->sample_freq_index, 4); 226 FDKwriteBits(hBitStream, hAdts->private_bit, 1); 227 FDKwriteBits( 228 hBitStream, 229 getChannelConfig(hAdts->channel_mode, hAdts->channel_config_zero), 3); 230 FDKwriteBits(hBitStream, hAdts->original, 1); 231 FDKwriteBits(hBitStream, hAdts->home, 1); 232 /* variable header */ 233 FDKwriteBits(hBitStream, hAdts->copyright_id, 1); 234 FDKwriteBits(hBitStream, hAdts->copyright_start, 1); 235 FDKwriteBits(hBitStream, (frame_length + hAdts->headerBits) >> 3, 13); 236 FDKwriteBits(hBitStream, buffer_fullness, 11); 237 FDKwriteBits(hBitStream, hAdts->num_raw_blocks, 2); 238 239 if (!hAdts->protection_absent) { 240 int i; 241 242 /* End header CRC portion for single raw data block and write dummy zero 243 * values for unknown fields. */ 244 if (hAdts->num_raw_blocks == 0) { 245 adtsWrite_CrcEndReg(hAdts, hBitStream, crcIndex); 246 } else { 247 for (i = 0; i < hAdts->num_raw_blocks; i++) { 248 FDKwriteBits(hBitStream, 0, 16); 249 } 250 } 251 FDKwriteBits(hBitStream, 0, 16); 252 } 253 } /* End of ADTS header */ 254 255 return 0; 256 } 257 258 void adtsWrite_EndRawDataBlock(HANDLE_ADTS hAdts, HANDLE_FDK_BITSTREAM hBs, 259 int *pBits) { 260 if (!hAdts->protection_absent) { 261 FDK_BITSTREAM bsWriter; 262 263 FDKinitBitStream(&bsWriter, hBs->hBitBuf.Buffer, hBs->hBitBuf.bufSize, 0, 264 BS_WRITER); 265 FDKpushFor(&bsWriter, 56); 266 267 if (hAdts->num_raw_blocks == 0) { 268 FDKwriteBits(&bsWriter, FDKcrcGetCRC(&hAdts->crcInfo), 16); 269 } else { 270 int distance; 271 272 /* Write CRC of current raw data block */ 273 FDKwriteBits(hBs, FDKcrcGetCRC(&hAdts->crcInfo), 16); 274 275 /* Write distance to current data block */ 276 if (hAdts->currentBlock < hAdts->num_raw_blocks) { 277 FDKpushFor(&bsWriter, hAdts->currentBlock * 16); 278 distance = 279 FDKgetValidBits(hBs) - (56 + (hAdts->num_raw_blocks) * 16 + 16); 280 FDKwriteBits(&bsWriter, distance >> 3, 16); 281 } 282 } 283 FDKsyncCache(&bsWriter); 284 } 285 286 /* Write total frame lenth for multiple raw data blocks and header CRC */ 287 if (hAdts->num_raw_blocks > 0 && 288 hAdts->currentBlock == hAdts->num_raw_blocks) { 289 FDK_BITSTREAM bsWriter; 290 int crcIndex = 0; 291 292 FDKinitBitStream(&bsWriter, hBs->hBitBuf.Buffer, hBs->hBitBuf.bufSize, 0, 293 BS_WRITER); 294 295 if (!hAdts->protection_absent) { 296 FDKcrcReset(&hAdts->crcInfo); 297 crcIndex = FDKcrcStartReg(&hAdts->crcInfo, &bsWriter, 0); 298 } 299 /* Write total frame length */ 300 FDKpushFor(&bsWriter, 56 - 28 + 2); 301 FDKwriteBits(&bsWriter, FDKgetValidBits(hBs) >> 3, 13); 302 303 /* Write header CRC */ 304 if (!hAdts->protection_absent) { 305 FDKpushFor(&bsWriter, 11 + 2 + (hAdts->num_raw_blocks) * 16); 306 FDKcrcEndReg(&hAdts->crcInfo, &bsWriter, crcIndex); 307 FDKwriteBits(&bsWriter, FDKcrcGetCRC(&hAdts->crcInfo), 16); 308 } 309 FDKsyncCache(&bsWriter); 310 } 311 312 /* Correct *pBits to reflect the amount of bits of the current subframe */ 313 *pBits -= hAdts->subFrameStartBit; 314 if (!hAdts->protection_absent && hAdts->num_raw_blocks > 0) { 315 /* Fixup CRC bits, since they come after each raw data block */ 316 *pBits += 16; 317 } 318 hAdts->currentBlock++; 319 } 320
