| |
| /* ----------------------------------------------------------------------------------------------------------- |
| Software License for The Fraunhofer FDK AAC Codec Library for Android |
| |
| © Copyright 1995 - 2012 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: |
| contents/description: CRC calculation |
| |
| ******************************************************************************/ |
| |
| #ifndef FDK_CRC_H |
| #define FDK_CRC_H |
| |
| |
| |
| #include "FDK_bitstream.h" |
| |
| |
| #define MAX_CRC_REGS 3 /*!< Maximal number of overlapping crc region in ADTS channel pair element is two. |
| Select three independent regions preventively. */ |
| |
| /** |
| * This structure describes single crc region used for crc calculation. |
| */ |
| typedef struct |
| { |
| UCHAR isActive; |
| INT maxBits; |
| UINT bitBufCntBits; |
| UINT validBits; |
| |
| } CCrcRegData; |
| |
| /** |
| * CRC info structure. |
| */ |
| typedef struct |
| { |
| CCrcRegData crcRegData[MAX_CRC_REGS]; /*!< Multiple crc region description. */ |
| const USHORT *pCrcLookup; /*!< Pointer to lookup table filled in FDK_crcInit(). */ |
| |
| USHORT crcPoly; /*!< CRC generator polynom. */ |
| USHORT crcMask; /*!< CRC mask. */ |
| USHORT startValue; /*!< CRC start value. */ |
| UCHAR crcLen; /*!< CRC length. */ |
| |
| UINT regStart; /*!< Start region marker for synchronization. */ |
| UINT regStop; /*!< Stop region marker for synchronization. */ |
| |
| USHORT crcValue; /*!< Crc value to be calculated. */ |
| |
| } FDK_CRCINFO; |
| |
| /** |
| * CRC info handle. |
| */ |
| typedef FDK_CRCINFO* HANDLE_FDK_CRCINFO; |
| |
| |
| /** |
| * \brief Initialize CRC structure. |
| * |
| * The function initializes existing crc info structure with denoted configuration. |
| * |
| * \param hCrcInfo Pointer to an outlying allocated crc info structure. |
| * \param crcPoly Configure crc polynom. |
| * \param crcStartValue Configure crc start value. |
| * \param crcLen Configure crc length. |
| * |
| * \return none |
| */ |
| void FDKcrcInit( |
| HANDLE_FDK_CRCINFO hCrcInfo, |
| const UINT crcPoly, |
| const UINT crcStartValue, |
| const UINT crcLen |
| ); |
| |
| /** |
| * \brief Reset CRC info structure. |
| * |
| * This function clears all intern states of the crc structure. |
| * |
| * \param hCrcInfo Pointer to crc info stucture. |
| * |
| * \return none |
| */ |
| void FDKcrcReset( |
| HANDLE_FDK_CRCINFO hCrcInfo |
| ); |
| |
| |
| /** |
| * \brief Start CRC region with maximum number of bits. |
| * |
| * This function marks position in bitstream to be used as start point for crc calculation. |
| * Bitstream range for crc calculation can be limited or kept dynamic depending on mBits parameter. |
| * The crc region has to be terminated with FDKcrcEndReg() in each case. |
| * |
| * \param hCrcInfo Pointer to crc info stucture. |
| * \param hBs Pointer to current bit buffer structure. |
| * \param mBits Number of bits in crc region to be calculated. |
| * - mBits > 0: Zero padding will be used for CRC calculation, if there |
| * are less than mBits bits available. |
| * - mBits < 0: No zero padding is done. |
| * - mBits = 0: The number of bits used in crc calculation is dynamically, |
| * depending on bitstream position between FDKcrcStartReg() and |
| * FDKcrcEndReg() call. |
| * |
| * \return ID for the created region, -1 in case of an error |
| */ |
| INT FDKcrcStartReg( |
| HANDLE_FDK_CRCINFO hCrcInfo, |
| const HANDLE_FDK_BITSTREAM hBs, |
| const INT mBits |
| ); |
| |
| |
| /** |
| * \brief Ends CRC region. |
| * |
| * This function terminates crc region specified with FDKcrcStartReg(). The number of bits in crc region depends |
| * on mBits parameter of FDKcrcStartReg(). |
| * This function calculates and updates crc in info structure. |
| * |
| * \param hCrcInfo Pointer to crc info stucture. |
| * \param hBs Pointer to current bit buffer structure. |
| * \param reg Crc region ID created in FDKcrcStartReg(). |
| * |
| * \return 0 on success |
| */ |
| INT FDKcrcEndReg( |
| HANDLE_FDK_CRCINFO hCrcInfo, |
| const HANDLE_FDK_BITSTREAM hBs, |
| const INT reg |
| ); |
| |
| |
| /** |
| * \brief This function returns crc value from info struct. |
| * |
| * \param hCrcInfo Pointer to crc info stucture. |
| * |
| * \return CRC value masked with crc length. |
| */ |
| USHORT FDKcrcGetCRC( |
| const HANDLE_FDK_CRCINFO hCrcInfo |
| ); |
| |
| |
| #endif /* FDK_CRC_H */ |
