| |
| /* ----------------------------------------------------------------------------------------------------------- |
| 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 |
| ----------------------------------------------------------------------------------------------------------- */ |
| |
| /*! |
| \file |
| \brief Remaining SBR Bit Writing Routines |
| */ |
| |
| #include "env_bit.h" |
| #include "cmondata.h" |
| |
| |
| #ifndef min |
| #define min(a,b) ( a < b ? a:b) |
| #endif |
| |
| #ifndef max |
| #define max(a,b) ( a > b ? a:b) |
| #endif |
| |
| /* ***************************** crcAdvance **********************************/ |
| /** |
| * @fn |
| * @brief updates crc data register |
| * @return none |
| * |
| * This function updates the crc register |
| * |
| */ |
| static void crcAdvance(USHORT crcPoly, |
| USHORT crcMask, |
| USHORT *crc, |
| ULONG bValue, |
| INT bBits |
| ) |
| { |
| INT i; |
| USHORT flag; |
| |
| for (i=bBits-1; i>=0; i--) { |
| flag = ((*crc) & crcMask) ? (1) : (0) ; |
| flag ^= (bValue & (1<<i)) ? (1) : (0) ; |
| |
| (*crc)<<=1; |
| if(flag) (*crc) ^= crcPoly; |
| } |
| } |
| |
| |
| /* ***************************** FDKsbrEnc_InitSbrBitstream **********************************/ |
| /** |
| * @fn |
| * @brief Inittialisation of sbr bitstream, write of dummy header and CRC |
| * @return none |
| * |
| * |
| * |
| */ |
| |
| INT FDKsbrEnc_InitSbrBitstream(HANDLE_COMMON_DATA hCmonData, |
| UCHAR *memoryBase, /*!< Pointer to bitstream buffer */ |
| INT memorySize, /*!< Length of bitstream buffer in bytes */ |
| HANDLE_FDK_CRCINFO hCrcInfo, |
| UINT sbrSyntaxFlags) /*!< SBR syntax flags */ |
| { |
| INT crcRegion = 0; |
| |
| /* reset bit buffer */ |
| FDKresetBitbuffer(&hCmonData->sbrBitbuf, BS_WRITER); |
| |
| FDKinitBitStream(&hCmonData->tmpWriteBitbuf, memoryBase, |
| memorySize, 0, BS_WRITER); |
| |
| if (sbrSyntaxFlags & SBR_SYNTAX_CRC) { |
| if (sbrSyntaxFlags & SBR_SYNTAX_DRM_CRC) |
| { /* Init and start CRC region */ |
| FDKwriteBits (&hCmonData->sbrBitbuf, 0x0, SI_SBR_DRM_CRC_BITS); |
| FDKcrcInit( hCrcInfo, 0x001d, 0xFFFF, SI_SBR_DRM_CRC_BITS ); |
| crcRegion = FDKcrcStartReg( hCrcInfo, &hCmonData->sbrBitbuf, 0 ); |
| } else { |
| FDKwriteBits (&hCmonData->sbrBitbuf, 0x0, SI_SBR_CRC_BITS); |
| } |
| } |
| |
| return (crcRegion); |
| } |
| |
| |
| /* ************************** FDKsbrEnc_AssembleSbrBitstream *******************************/ |
| /** |
| * @fn |
| * @brief Formats the SBR payload |
| * @return nothing |
| * |
| * Also the CRC will be calculated here. |
| * |
| */ |
| |
| void |
| FDKsbrEnc_AssembleSbrBitstream( HANDLE_COMMON_DATA hCmonData, |
| HANDLE_FDK_CRCINFO hCrcInfo, |
| INT crcRegion, |
| UINT sbrSyntaxFlags) |
| { |
| USHORT crcReg = SBR_CRCINIT; |
| INT numCrcBits,i; |
| |
| /* check if SBR is present */ |
| if ( hCmonData==NULL ) |
| return; |
| |
| hCmonData->sbrFillBits = 0; /* Fill bits are written only for GA streams */ |
| |
| if ( sbrSyntaxFlags & SBR_SYNTAX_DRM_CRC ) |
| { |
| /* |
| * Calculate and write DRM CRC |
| */ |
| FDKcrcEndReg( hCrcInfo, &hCmonData->sbrBitbuf, crcRegion ); |
| FDKwriteBits( &hCmonData->tmpWriteBitbuf, FDKcrcGetCRC(hCrcInfo)^0xFF, SI_SBR_DRM_CRC_BITS ); |
| } |
| else |
| { |
| if ( !(sbrSyntaxFlags & SBR_SYNTAX_LOW_DELAY) ) |
| { |
| /* Do alignment here, because its defined as part of the sbr_extension_data */ |
| int sbrLoad = hCmonData->sbrHdrBits + hCmonData->sbrDataBits; |
| |
| if ( sbrSyntaxFlags & SBR_SYNTAX_CRC ) { |
| sbrLoad += SI_SBR_CRC_BITS; |
| } |
| |
| sbrLoad += 4; /* Do byte Align with 4 bit offset. ISO/IEC 14496-3:2005(E) page 39. */ |
| |
| hCmonData->sbrFillBits = (8 - (sbrLoad % 8)) % 8; |
| |
| /* |
| append fill bits |
| */ |
| FDKwriteBits(&hCmonData->sbrBitbuf, 0, hCmonData->sbrFillBits ); |
| |
| FDK_ASSERT(FDKgetValidBits(&hCmonData->sbrBitbuf) % 8 == 4); |
| } |
| |
| /* |
| calculate crc |
| */ |
| if ( sbrSyntaxFlags & SBR_SYNTAX_CRC ) { |
| FDK_BITSTREAM tmpCRCBuf = hCmonData->sbrBitbuf; |
| FDKresetBitbuffer( &tmpCRCBuf, BS_READER ); |
| |
| numCrcBits = hCmonData->sbrHdrBits + hCmonData->sbrDataBits + hCmonData->sbrFillBits; |
| |
| for(i=0;i<numCrcBits;i++){ |
| INT bit; |
| bit = FDKreadBits(&tmpCRCBuf,1); |
| crcAdvance(SBR_CRC_POLY,SBR_CRC_MASK,&crcReg,bit,1); |
| } |
| crcReg &= (SBR_CRC_RANGE); |
| |
| /* |
| * Write CRC data. |
| */ |
| FDKwriteBits (&hCmonData->tmpWriteBitbuf, crcReg, SI_SBR_CRC_BITS); |
| } |
| } |
| |
| FDKsyncCache(&hCmonData->tmpWriteBitbuf); |
| } |
| |