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 /******************************** MPEG Audio Encoder ************************** 85 86 Initial author: Alex Groeschel 87 contents/description: ADTS Transport Headers support 88 89 ******************************************************************************/ 90 91 #include "tpenc_adts.h" 92 93 94 #include "tpenc_lib.h" 95 #include "tpenc_asc.h" 96 97 98 int adtsWrite_CrcStartReg( 99 HANDLE_ADTS pAdts, /*!< pointer to adts stucture */ 100 HANDLE_FDK_BITSTREAM hBs, /*!< handle to current bit buffer structure */ 101 int mBits /*!< number of bits in crc region */ 102 ) 103 { 104 if (pAdts->protection_absent) { 105 return 0; 106 } 107 return ( FDKcrcStartReg(&pAdts->crcInfo, hBs, mBits) ); 108 } 109 110 void adtsWrite_CrcEndReg( 111 HANDLE_ADTS pAdts, /*!< pointer to adts crc info stucture */ 112 HANDLE_FDK_BITSTREAM hBs, /*!< handle to current bit buffer structure */ 113 int reg /*!< crc region */ 114 ) 115 { 116 if (pAdts->protection_absent == 0) 117 { 118 FDKcrcEndReg(&pAdts->crcInfo, hBs, reg); 119 } 120 } 121 122 int adtsWrite_GetHeaderBits( HANDLE_ADTS hAdts ) 123 { 124 int bits = 0; 125 126 if (hAdts->currentBlock == 0) { 127 /* Static and variable header bits */ 128 bits = 56; 129 if (!hAdts->protection_absent) { 130 /* Add header/ single raw data block CRC bits */ 131 bits += 16; 132 if (hAdts->num_raw_blocks>0) { 133 /* Add bits of raw data block position markers */ 134 bits += (hAdts->num_raw_blocks)*16; 135 } 136 } 137 } 138 if (!hAdts->protection_absent && hAdts->num_raw_blocks>0) { 139 /* Add raw data block CRC bits. Not really part of the header, put they cause bit overhead to be accounted. */ 140 bits += 16; 141 } 142 143 hAdts->headerBits = bits; 144 145 return bits; 146 } 147 148 INT adtsWrite_Init(HANDLE_ADTS hAdts, CODER_CONFIG *config) 149 { 150 /* Sanity checks */ 151 if ( config->nSubFrames < 1 152 || config->nSubFrames > 4 153 || (int)config->aot > 4 154 || (int)config->aot < 1 ) { 155 return -1; 156 } 157 158 /* fixed header */ 159 if (config->flags & CC_MPEG_ID) { 160 hAdts->mpeg_id = 0; /* MPEG 4 */ 161 } else { 162 hAdts->mpeg_id = 1; /* MPEG 2 */ 163 } 164 hAdts->layer=0; 165 hAdts->protection_absent = ! (config->flags & CC_PROTECTION); 166 hAdts->profile = ((int)config->aot) - 1; 167 hAdts->sample_freq_index = getSamplingRateIndex(config->samplingRate); 168 hAdts->sample_freq = config->samplingRate; 169 hAdts->private_bit=0; 170 hAdts->channel_mode = config->channelMode; 171 hAdts->original=0; 172 hAdts->home=0; 173 /* variable header */ 174 hAdts->copyright_id=0; 175 hAdts->copyright_start=0; 176 177 hAdts->num_raw_blocks=config->nSubFrames-1; /* 0 means 1 raw data block */ 178 179 FDKcrcInit(&hAdts->crcInfo, 0x8005, 0xFFFF, 16); 180 181 hAdts->currentBlock = 0; 182 183 184 return 0; 185 } 186 187 int adtsWrite_EncodeHeader(HANDLE_ADTS hAdts, 188 HANDLE_FDK_BITSTREAM hBitStream, 189 int buffer_fullness, 190 int frame_length) 191 { 192 INT crcIndex = 0; 193 194 195 hAdts->headerBits = adtsWrite_GetHeaderBits(hAdts); 196 197 FDK_ASSERT(((frame_length+hAdts->headerBits)/8)<0x2000); /*13 bit*/ 198 FDK_ASSERT(buffer_fullness<0x800); /* 11 bit */ 199 200 if (!hAdts->protection_absent) { 201 FDKcrcReset(&hAdts->crcInfo); 202 } 203 204 if (hAdts->currentBlock == 0) { 205 FDKresetBitbuffer(hBitStream, BS_WRITER); 206 } 207 208 hAdts->subFrameStartBit = FDKgetValidBits(hBitStream); 209 210 /* Skip new header if this is raw data block 1..n */ 211 if (hAdts->currentBlock == 0) 212 { 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(hBitStream, getChannelConfig(hAdts->channel_mode), 3); 228 FDKwriteBits(hBitStream, hAdts->original, 1); 229 FDKwriteBits(hBitStream, hAdts->home, 1); 230 /* variable header */ 231 FDKwriteBits(hBitStream, hAdts->copyright_id, 1); 232 FDKwriteBits(hBitStream, hAdts->copyright_start, 1); 233 FDKwriteBits(hBitStream, (frame_length + hAdts->headerBits)>>3, 13); 234 FDKwriteBits(hBitStream, buffer_fullness, 11); 235 FDKwriteBits(hBitStream, hAdts->num_raw_blocks, 2); 236 237 if (!hAdts->protection_absent) { 238 int i; 239 240 /* End header CRC portion for single raw data block and write dummy zero values for unknown fields. */ 241 if (hAdts->num_raw_blocks == 0) { 242 adtsWrite_CrcEndReg(hAdts, hBitStream, crcIndex); 243 } else { 244 for (i=0; i<hAdts->num_raw_blocks; i++) { 245 FDKwriteBits(hBitStream, 0, 16); 246 } 247 } 248 FDKwriteBits(hBitStream, 0, 16); 249 } 250 } /* End of ADTS header */ 251 252 return 0; 253 } 254 255 void adtsWrite_EndRawDataBlock(HANDLE_ADTS hAdts, 256 HANDLE_FDK_BITSTREAM hBs, 257 int *pBits) 258 { 259 if (!hAdts->protection_absent) { 260 FDK_BITSTREAM bsWriter; 261 262 FDKinitBitStream(&bsWriter, hBs->hBitBuf.Buffer, hBs->hBitBuf.bufSize, 0, BS_WRITER); 263 FDKpushFor(&bsWriter, 56); 264 265 if (hAdts->num_raw_blocks == 0) { 266 FDKwriteBits(&bsWriter, FDKcrcGetCRC(&hAdts->crcInfo), 16); 267 } else { 268 int distance; 269 270 /* Write CRC of current raw data block */ 271 FDKwriteBits(hBs, FDKcrcGetCRC(&hAdts->crcInfo), 16); 272 273 /* Write distance to current data block */ 274 if (hAdts->currentBlock < hAdts->num_raw_blocks) { 275 FDKpushFor(&bsWriter, hAdts->currentBlock*16); 276 distance = FDKgetValidBits(hBs) - (56 + (hAdts->num_raw_blocks)*16 + 16); 277 FDKwriteBits(&bsWriter, distance>>3, 16); 278 } 279 } 280 FDKsyncCache(&bsWriter); 281 } 282 283 /* Write total frame lenth for multiple raw data blocks and header CRC */ 284 if (hAdts->num_raw_blocks > 0 && hAdts->currentBlock == hAdts->num_raw_blocks) { 285 FDK_BITSTREAM bsWriter; 286 int crcIndex = 0; 287 288 FDKinitBitStream(&bsWriter, hBs->hBitBuf.Buffer, hBs->hBitBuf.bufSize, 0, BS_WRITER); 289 290 if (!hAdts->protection_absent) { 291 FDKcrcReset(&hAdts->crcInfo); 292 crcIndex = FDKcrcStartReg(&hAdts->crcInfo, &bsWriter, 0); 293 } 294 /* Write total frame length */ 295 FDKpushFor(&bsWriter, 56-28+2); 296 FDKwriteBits(&bsWriter, FDKgetValidBits(hBs)>>3, 13); 297 298 /* Write header CRC */ 299 if (!hAdts->protection_absent) { 300 FDKpushFor(&bsWriter, 11+2 + (hAdts->num_raw_blocks)*16); 301 FDKcrcEndReg(&hAdts->crcInfo, &bsWriter, crcIndex); 302 FDKwriteBits(&bsWriter, FDKcrcGetCRC(&hAdts->crcInfo), 16); 303 } 304 FDKsyncCache(&bsWriter); 305 } 306 307 /* Correct *pBits to reflect the amount of bits of the current subframe */ 308 *pBits -= hAdts->subFrameStartBit; 309 if (!hAdts->protection_absent && hAdts->num_raw_blocks > 0) { 310 /* Fixup CRC bits, since they come after each raw data block */ 311 *pBits += 16; 312 } 313 hAdts->currentBlock++; 314 } 315 316
