tpenc_adts.cpp revision 4f0d97057c5c640b25518358886f8c47da9fc052
1a04b632350e5d0e9994fc667afc59407a39da0baEric Anholt 26b9e31f3eb3dbe20cbc8493b963bbc6530e392c6Keith Whitwell/* ----------------------------------------------------------------------------------------------------------- 36b9e31f3eb3dbe20cbc8493b963bbc6530e392c6Keith WhitwellSoftware License for The Fraunhofer FDK AAC Codec Library for Android 46b9e31f3eb3dbe20cbc8493b963bbc6530e392c6Keith Whitwell 56b9e31f3eb3dbe20cbc8493b963bbc6530e392c6Keith Whitwell� Copyright 1995 - 2013 Fraunhofer-Gesellschaft zur F�rderung der angewandten Forschung e.V. 66b9e31f3eb3dbe20cbc8493b963bbc6530e392c6Keith Whitwell All rights reserved. 76b9e31f3eb3dbe20cbc8493b963bbc6530e392c6Keith Whitwell 86b9e31f3eb3dbe20cbc8493b963bbc6530e392c6Keith Whitwell 1. INTRODUCTION 96b9e31f3eb3dbe20cbc8493b963bbc6530e392c6Keith WhitwellThe Fraunhofer FDK AAC Codec Library for Android ("FDK AAC Codec") is software that implements 106b9e31f3eb3dbe20cbc8493b963bbc6530e392c6Keith Whitwellthe MPEG Advanced Audio Coding ("AAC") encoding and decoding scheme for digital audio. 116b9e31f3eb3dbe20cbc8493b963bbc6530e392c6Keith WhitwellThis FDK AAC Codec software is intended to be used on a wide variety of Android devices. 126b9e31f3eb3dbe20cbc8493b963bbc6530e392c6Keith Whitwell 136b9e31f3eb3dbe20cbc8493b963bbc6530e392c6Keith WhitwellAAC's HE-AAC and HE-AAC v2 versions are regarded as today's most efficient general perceptual 146b9e31f3eb3dbe20cbc8493b963bbc6530e392c6Keith Whitwellaudio codecs. AAC-ELD is considered the best-performing full-bandwidth communications codec by 156b9e31f3eb3dbe20cbc8493b963bbc6530e392c6Keith Whitwellindependent studies and is widely deployed. AAC has been standardized by ISO and IEC as part 166b9e31f3eb3dbe20cbc8493b963bbc6530e392c6Keith Whitwellof the MPEG specifications. 176b9e31f3eb3dbe20cbc8493b963bbc6530e392c6Keith Whitwell 186b9e31f3eb3dbe20cbc8493b963bbc6530e392c6Keith WhitwellPatent licenses for necessary patent claims for the FDK AAC Codec (including those of Fraunhofer) 196b9e31f3eb3dbe20cbc8493b963bbc6530e392c6Keith Whitwellmay be obtained through Via Licensing (www.vialicensing.com) or through the respective patent owners 206b9e31f3eb3dbe20cbc8493b963bbc6530e392c6Keith Whitwellindividually for the purpose of encoding or decoding bit streams in products that are compliant with 216b9e31f3eb3dbe20cbc8493b963bbc6530e392c6Keith Whitwellthe ISO/IEC MPEG audio standards. Please note that most manufacturers of Android devices already license 226b9e31f3eb3dbe20cbc8493b963bbc6530e392c6Keith Whitwellthese patent claims through Via Licensing or directly from the patent owners, and therefore FDK AAC Codec 236b9e31f3eb3dbe20cbc8493b963bbc6530e392c6Keith Whitwellsoftware may already be covered under those patent licenses when it is used for those licensed purposes only. 246b9e31f3eb3dbe20cbc8493b963bbc6530e392c6Keith Whitwell 256b9e31f3eb3dbe20cbc8493b963bbc6530e392c6Keith WhitwellCommercially-licensed AAC software libraries, including floating-point versions with enhanced sound quality, 266b9e31f3eb3dbe20cbc8493b963bbc6530e392c6Keith Whitwellare also available from Fraunhofer. Users are encouraged to check the Fraunhofer website for additional 276b9e31f3eb3dbe20cbc8493b963bbc6530e392c6Keith Whitwellapplications information and documentation. 286b9e31f3eb3dbe20cbc8493b963bbc6530e392c6Keith Whitwell 296b9e31f3eb3dbe20cbc8493b963bbc6530e392c6Keith Whitwell2. COPYRIGHT LICENSE 306b9e31f3eb3dbe20cbc8493b963bbc6530e392c6Keith Whitwell 316b9e31f3eb3dbe20cbc8493b963bbc6530e392c6Keith WhitwellRedistribution and use in source and binary forms, with or without modification, are permitted without 326b9e31f3eb3dbe20cbc8493b963bbc6530e392c6Keith Whitwellpayment of copyright license fees provided that you satisfy the following conditions: 336b9e31f3eb3dbe20cbc8493b963bbc6530e392c6Keith Whitwell 346b99cafd69a791d03ce749d0fd2b9f59ca265677Michel DänzerYou must retain the complete text of this software license in redistributions of the FDK AAC Codec or 356b9e31f3eb3dbe20cbc8493b963bbc6530e392c6Keith Whitwellyour modifications thereto in source code form. 366b9e31f3eb3dbe20cbc8493b963bbc6530e392c6Keith Whitwell 376b9e31f3eb3dbe20cbc8493b963bbc6530e392c6Keith WhitwellYou must retain the complete text of this software license in the documentation and/or other materials 386b9e31f3eb3dbe20cbc8493b963bbc6530e392c6Keith Whitwellprovided with redistributions of the FDK AAC Codec or your modifications thereto in binary form. 396b9e31f3eb3dbe20cbc8493b963bbc6530e392c6Keith WhitwellYou must make available free of charge copies of the complete source code of the FDK AAC Codec and your 406b9e31f3eb3dbe20cbc8493b963bbc6530e392c6Keith Whitwellmodifications thereto to recipients of copies in binary form. 416b9e31f3eb3dbe20cbc8493b963bbc6530e392c6Keith Whitwell 426b9e31f3eb3dbe20cbc8493b963bbc6530e392c6Keith WhitwellThe name of Fraunhofer may not be used to endorse or promote products derived from this library without 436b9e31f3eb3dbe20cbc8493b963bbc6530e392c6Keith Whitwellprior written permission. 446b9e31f3eb3dbe20cbc8493b963bbc6530e392c6Keith Whitwell 456b9e31f3eb3dbe20cbc8493b963bbc6530e392c6Keith WhitwellYou may not charge copyright license fees for anyone to use, copy or distribute the FDK AAC Codec 46a04b632350e5d0e9994fc667afc59407a39da0baEric Anholtsoftware or your modifications thereto. 476b99cafd69a791d03ce749d0fd2b9f59ca265677Michel Dänzer 486b9e31f3eb3dbe20cbc8493b963bbc6530e392c6Keith WhitwellYour modified versions of the FDK AAC Codec must carry prominent notices stating that you changed the software 496b9e31f3eb3dbe20cbc8493b963bbc6530e392c6Keith Whitwelland the date of any change. For modified versions of the FDK AAC Codec, the term 506b9e31f3eb3dbe20cbc8493b963bbc6530e392c6Keith Whitwell"Fraunhofer FDK AAC Codec Library for Android" must be replaced by the term 516b9e31f3eb3dbe20cbc8493b963bbc6530e392c6Keith Whitwell"Third-Party Modified Version of the Fraunhofer FDK AAC Codec Library for Android." 526b9e31f3eb3dbe20cbc8493b963bbc6530e392c6Keith Whitwell 536b9e31f3eb3dbe20cbc8493b963bbc6530e392c6Keith Whitwell3. NO PATENT LICENSE 546b9e31f3eb3dbe20cbc8493b963bbc6530e392c6Keith Whitwell 556b9e31f3eb3dbe20cbc8493b963bbc6530e392c6Keith WhitwellNO EXPRESS OR IMPLIED LICENSES TO ANY PATENT CLAIMS, including without limitation the patents of Fraunhofer, 566b9e31f3eb3dbe20cbc8493b963bbc6530e392c6Keith WhitwellARE GRANTED BY THIS SOFTWARE LICENSE. Fraunhofer provides no warranty of patent non-infringement with 57respect to this software. 58 59You may use this FDK AAC Codec software or modifications thereto only for purposes that are authorized 60by appropriate patent licenses. 61 624. DISCLAIMER 63 64This 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 66of merchantability and fitness for a particular purpose. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR 67CONTRIBUTORS BE LIABLE for any direct, indirect, incidental, special, exemplary, or consequential damages, 68including but not limited to procurement of substitute goods or services; loss of use, data, or profits, 69or business interruption, however caused and on any theory of liability, whether in contract, strict 70liability, or tort (including negligence), arising in any way out of the use of this software, even if 71advised of the possibility of such damage. 72 735. CONTACT INFORMATION 74 75Fraunhofer Institute for Integrated Circuits IIS 76Attention: Audio and Multimedia Departments - FDK AAC LL 77Am Wolfsmantel 33 7891058 Erlangen, Germany 79 80www.iis.fraunhofer.de/amm 81amm-info@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 98int 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 110void 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 122int 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 148INT 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 187int 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 255void 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