| |
| /* ----------------------------------------------------------------------------------------------------------- |
| Software License for The Fraunhofer FDK AAC Codec Library for Android |
| |
| © Copyright 1995 - 2013 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. |
| All rights reserved. |
| |
| 1. INTRODUCTION |
| The Fraunhofer FDK AAC Codec Library for Android ("FDK AAC Codec") is software that implements |
| the MPEG Advanced Audio Coding ("AAC") encoding and decoding scheme for digital audio. |
| This FDK AAC Codec software is intended to be used on a wide variety of Android devices. |
| |
| AAC's HE-AAC and HE-AAC v2 versions are regarded as today's most efficient general perceptual |
| audio codecs. AAC-ELD is considered the best-performing full-bandwidth communications codec by |
| independent studies and is widely deployed. AAC has been standardized by ISO and IEC as part |
| of the MPEG specifications. |
| |
| Patent licenses for necessary patent claims for the FDK AAC Codec (including those of Fraunhofer) |
| may be obtained through Via Licensing (www.vialicensing.com) or through the respective patent owners |
| individually for the purpose of encoding or decoding bit streams in products that are compliant with |
| the ISO/IEC MPEG audio standards. Please note that most manufacturers of Android devices already license |
| these patent claims through Via Licensing or directly from the patent owners, and therefore FDK AAC Codec |
| software may already be covered under those patent licenses when it is used for those licensed purposes only. |
| |
| Commercially-licensed AAC software libraries, including floating-point versions with enhanced sound quality, |
| are also available from Fraunhofer. Users are encouraged to check the Fraunhofer website for additional |
| applications information and documentation. |
| |
| 2. COPYRIGHT LICENSE |
| |
| Redistribution and use in source and binary forms, with or without modification, are permitted without |
| payment of copyright license fees provided that you satisfy the following conditions: |
| |
| You must retain the complete text of this software license in redistributions of the FDK AAC Codec or |
| your modifications thereto in source code form. |
| |
| You must retain the complete text of this software license in the documentation and/or other materials |
| provided with redistributions of the FDK AAC Codec or your modifications thereto in binary form. |
| You must make available free of charge copies of the complete source code of the FDK AAC Codec and your |
| modifications thereto to recipients of copies in binary form. |
| |
| The name of Fraunhofer may not be used to endorse or promote products derived from this library without |
| prior written permission. |
| |
| You may not charge copyright license fees for anyone to use, copy or distribute the FDK AAC Codec |
| software or your modifications thereto. |
| |
| Your modified versions of the FDK AAC Codec must carry prominent notices stating that you changed the software |
| and the date of any change. For modified versions of the FDK AAC Codec, the term |
| "Fraunhofer FDK AAC Codec Library for Android" must be replaced by the term |
| "Third-Party Modified Version of the Fraunhofer FDK AAC Codec Library for Android." |
| |
| 3. NO PATENT LICENSE |
| |
| NO EXPRESS OR IMPLIED LICENSES TO ANY PATENT CLAIMS, including without limitation the patents of Fraunhofer, |
| ARE GRANTED BY THIS SOFTWARE LICENSE. Fraunhofer provides no warranty of patent non-infringement with |
| respect to this software. |
| |
| You may use this FDK AAC Codec software or modifications thereto only for purposes that are authorized |
| by appropriate patent licenses. |
| |
| 4. DISCLAIMER |
| |
| This FDK AAC Codec software is provided by Fraunhofer on behalf of the copyright holders and contributors |
| "AS IS" and WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, including but not limited to the implied warranties |
| of merchantability and fitness for a particular purpose. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR |
| CONTRIBUTORS BE LIABLE for any direct, indirect, incidental, special, exemplary, or consequential damages, |
| including but not limited to procurement of substitute goods or services; loss of use, data, or profits, |
| or business interruption, however caused and on any theory of liability, whether in contract, strict |
| liability, or tort (including negligence), arising in any way out of the use of this software, even if |
| advised of the possibility of such damage. |
| |
| 5. CONTACT INFORMATION |
| |
| Fraunhofer Institute for Integrated Circuits IIS |
| Attention: Audio and Multimedia Departments - FDK AAC LL |
| Am Wolfsmantel 33 |
| 91058 Erlangen, Germany |
| |
| www.iis.fraunhofer.de/amm |
| amm-info@iis.fraunhofer.de |
| ----------------------------------------------------------------------------------------------------------- */ |
| |
| /******************************** MPEG Audio Encoder ************************** |
| |
| Initial author: Alex Groeschel |
| contents/description: ADTS Transport Headers support |
| |
| ******************************************************************************/ |
| |
| #include "tpenc_adts.h" |
| |
| |
| #include "tpenc_lib.h" |
| #include "tpenc_asc.h" |
| |
| |
| int adtsWrite_CrcStartReg( |
| HANDLE_ADTS pAdts, /*!< pointer to adts stucture */ |
| HANDLE_FDK_BITSTREAM hBs, /*!< handle to current bit buffer structure */ |
| int mBits /*!< number of bits in crc region */ |
| ) |
| { |
| if (pAdts->protection_absent) { |
| return 0; |
| } |
| return ( FDKcrcStartReg(&pAdts->crcInfo, hBs, mBits) ); |
| } |
| |
| void adtsWrite_CrcEndReg( |
| HANDLE_ADTS pAdts, /*!< pointer to adts crc info stucture */ |
| HANDLE_FDK_BITSTREAM hBs, /*!< handle to current bit buffer structure */ |
| int reg /*!< crc region */ |
| ) |
| { |
| if (pAdts->protection_absent == 0) |
| { |
| FDKcrcEndReg(&pAdts->crcInfo, hBs, reg); |
| } |
| } |
| |
| int adtsWrite_GetHeaderBits( HANDLE_ADTS hAdts ) |
| { |
| int bits = 0; |
| |
| if (hAdts->currentBlock == 0) { |
| /* Static and variable header bits */ |
| bits = 56; |
| if (!hAdts->protection_absent) { |
| /* Add header/ single raw data block CRC bits */ |
| bits += 16; |
| if (hAdts->num_raw_blocks>0) { |
| /* Add bits of raw data block position markers */ |
| bits += (hAdts->num_raw_blocks)*16; |
| } |
| } |
| } |
| if (!hAdts->protection_absent && hAdts->num_raw_blocks>0) { |
| /* Add raw data block CRC bits. Not really part of the header, put they cause bit overhead to be accounted. */ |
| bits += 16; |
| } |
| |
| hAdts->headerBits = bits; |
| |
| return bits; |
| } |
| |
| INT adtsWrite_Init(HANDLE_ADTS hAdts, CODER_CONFIG *config) |
| { |
| /* Sanity checks */ |
| if ( config->nSubFrames < 1 |
| || config->nSubFrames > 4 |
| || (int)config->aot > 4 |
| || (int)config->aot < 1 ) { |
| return -1; |
| } |
| |
| /* fixed header */ |
| if (config->flags & CC_MPEG_ID) { |
| hAdts->mpeg_id = 0; /* MPEG 4 */ |
| } else { |
| hAdts->mpeg_id = 1; /* MPEG 2 */ |
| } |
| hAdts->layer=0; |
| hAdts->protection_absent = ! (config->flags & CC_PROTECTION); |
| hAdts->profile = ((int)config->aot) - 1; |
| hAdts->sample_freq_index = getSamplingRateIndex(config->samplingRate); |
| hAdts->sample_freq = config->samplingRate; |
| hAdts->private_bit=0; |
| hAdts->channel_mode = config->channelMode; |
| hAdts->original=0; |
| hAdts->home=0; |
| /* variable header */ |
| hAdts->copyright_id=0; |
| hAdts->copyright_start=0; |
| |
| hAdts->num_raw_blocks=config->nSubFrames-1; /* 0 means 1 raw data block */ |
| |
| FDKcrcInit(&hAdts->crcInfo, 0x8005, 0xFFFF, 16); |
| |
| hAdts->currentBlock = 0; |
| |
| |
| return 0; |
| } |
| |
| int adtsWrite_EncodeHeader(HANDLE_ADTS hAdts, |
| HANDLE_FDK_BITSTREAM hBitStream, |
| int buffer_fullness, |
| int frame_length) |
| { |
| INT crcIndex = 0; |
| |
| |
| hAdts->headerBits = adtsWrite_GetHeaderBits(hAdts); |
| |
| FDK_ASSERT(((frame_length+hAdts->headerBits)/8)<0x2000); /*13 bit*/ |
| FDK_ASSERT(buffer_fullness<0x800); /* 11 bit */ |
| |
| if (!hAdts->protection_absent) { |
| FDKcrcReset(&hAdts->crcInfo); |
| } |
| |
| if (hAdts->currentBlock == 0) { |
| FDKresetBitbuffer(hBitStream, BS_WRITER); |
| } |
| |
| hAdts->subFrameStartBit = FDKgetValidBits(hBitStream); |
| |
| /* Skip new header if this is raw data block 1..n */ |
| if (hAdts->currentBlock == 0) |
| { |
| FDKresetBitbuffer(hBitStream, BS_WRITER); |
| |
| if (hAdts->num_raw_blocks == 0) { |
| crcIndex = adtsWrite_CrcStartReg(hAdts, hBitStream, 0); |
| } |
| |
| /* fixed header */ |
| FDKwriteBits(hBitStream, 0xFFF, 12); |
| FDKwriteBits(hBitStream, hAdts->mpeg_id, 1); |
| FDKwriteBits(hBitStream, hAdts->layer, 2); |
| FDKwriteBits(hBitStream, hAdts->protection_absent, 1); |
| FDKwriteBits(hBitStream, hAdts->profile, 2); |
| FDKwriteBits(hBitStream, hAdts->sample_freq_index, 4); |
| FDKwriteBits(hBitStream, hAdts->private_bit, 1); |
| FDKwriteBits(hBitStream, getChannelConfig(hAdts->channel_mode), 3); |
| FDKwriteBits(hBitStream, hAdts->original, 1); |
| FDKwriteBits(hBitStream, hAdts->home, 1); |
| /* variable header */ |
| FDKwriteBits(hBitStream, hAdts->copyright_id, 1); |
| FDKwriteBits(hBitStream, hAdts->copyright_start, 1); |
| FDKwriteBits(hBitStream, (frame_length + hAdts->headerBits)>>3, 13); |
| FDKwriteBits(hBitStream, buffer_fullness, 11); |
| FDKwriteBits(hBitStream, hAdts->num_raw_blocks, 2); |
| |
| if (!hAdts->protection_absent) { |
| int i; |
| |
| /* End header CRC portion for single raw data block and write dummy zero values for unknown fields. */ |
| if (hAdts->num_raw_blocks == 0) { |
| adtsWrite_CrcEndReg(hAdts, hBitStream, crcIndex); |
| } else { |
| for (i=0; i<hAdts->num_raw_blocks; i++) { |
| FDKwriteBits(hBitStream, 0, 16); |
| } |
| } |
| FDKwriteBits(hBitStream, 0, 16); |
| } |
| } /* End of ADTS header */ |
| |
| return 0; |
| } |
| |
| void adtsWrite_EndRawDataBlock(HANDLE_ADTS hAdts, |
| HANDLE_FDK_BITSTREAM hBs, |
| int *pBits) |
| { |
| if (!hAdts->protection_absent) { |
| FDK_BITSTREAM bsWriter; |
| |
| FDKinitBitStream(&bsWriter, hBs->hBitBuf.Buffer, hBs->hBitBuf.bufSize, 0, BS_WRITER); |
| FDKpushFor(&bsWriter, 56); |
| |
| if (hAdts->num_raw_blocks == 0) { |
| FDKwriteBits(&bsWriter, FDKcrcGetCRC(&hAdts->crcInfo), 16); |
| } else { |
| int distance; |
| |
| /* Write CRC of current raw data block */ |
| FDKwriteBits(hBs, FDKcrcGetCRC(&hAdts->crcInfo), 16); |
| |
| /* Write distance to current data block */ |
| if (hAdts->currentBlock < hAdts->num_raw_blocks) { |
| FDKpushFor(&bsWriter, hAdts->currentBlock*16); |
| distance = FDKgetValidBits(hBs) - (56 + (hAdts->num_raw_blocks)*16 + 16); |
| FDKwriteBits(&bsWriter, distance>>3, 16); |
| } |
| } |
| FDKsyncCache(&bsWriter); |
| } |
| |
| /* Write total frame lenth for multiple raw data blocks and header CRC */ |
| if (hAdts->num_raw_blocks > 0 && hAdts->currentBlock == hAdts->num_raw_blocks) { |
| FDK_BITSTREAM bsWriter; |
| int crcIndex = 0; |
| |
| FDKinitBitStream(&bsWriter, hBs->hBitBuf.Buffer, hBs->hBitBuf.bufSize, 0, BS_WRITER); |
| |
| if (!hAdts->protection_absent) { |
| FDKcrcReset(&hAdts->crcInfo); |
| crcIndex = FDKcrcStartReg(&hAdts->crcInfo, &bsWriter, 0); |
| } |
| /* Write total frame length */ |
| FDKpushFor(&bsWriter, 56-28+2); |
| FDKwriteBits(&bsWriter, FDKgetValidBits(hBs)>>3, 13); |
| |
| /* Write header CRC */ |
| if (!hAdts->protection_absent) { |
| FDKpushFor(&bsWriter, 11+2 + (hAdts->num_raw_blocks)*16); |
| FDKcrcEndReg(&hAdts->crcInfo, &bsWriter, crcIndex); |
| FDKwriteBits(&bsWriter, FDKcrcGetCRC(&hAdts->crcInfo), 16); |
| } |
| FDKsyncCache(&bsWriter); |
| } |
| |
| /* Correct *pBits to reflect the amount of bits of the current subframe */ |
| *pBits -= hAdts->subFrameStartBit; |
| if (!hAdts->protection_absent && hAdts->num_raw_blocks > 0) { |
| /* Fixup CRC bits, since they come after each raw data block */ |
| *pBits += 16; |
| } |
| hAdts->currentBlock++; |
| } |
| |