4f0d97057c
- Update disclaimer in all source files. - Increment library version in each FDK sub-module. Bug 9428126 Change-Id: I490b96d4ee472246b01483202b0bb4f1e9c2a5d7
232 lines
9.2 KiB
C
232 lines
9.2 KiB
C
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/* -----------------------------------------------------------------------------------------------------------
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Software License for The Fraunhofer FDK AAC Codec Library for Android
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© Copyright 1995 - 2013 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.
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All rights reserved.
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1. INTRODUCTION
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The Fraunhofer FDK AAC Codec Library for Android ("FDK AAC Codec") is software that implements
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the MPEG Advanced Audio Coding ("AAC") encoding and decoding scheme for digital audio.
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This FDK AAC Codec software is intended to be used on a wide variety of Android devices.
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AAC's HE-AAC and HE-AAC v2 versions are regarded as today's most efficient general perceptual
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audio codecs. AAC-ELD is considered the best-performing full-bandwidth communications codec by
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independent studies and is widely deployed. AAC has been standardized by ISO and IEC as part
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of the MPEG specifications.
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Patent licenses for necessary patent claims for the FDK AAC Codec (including those of Fraunhofer)
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may be obtained through Via Licensing (www.vialicensing.com) or through the respective patent owners
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individually for the purpose of encoding or decoding bit streams in products that are compliant with
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the ISO/IEC MPEG audio standards. Please note that most manufacturers of Android devices already license
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these patent claims through Via Licensing or directly from the patent owners, and therefore FDK AAC Codec
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software may already be covered under those patent licenses when it is used for those licensed purposes only.
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Commercially-licensed AAC software libraries, including floating-point versions with enhanced sound quality,
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are also available from Fraunhofer. Users are encouraged to check the Fraunhofer website for additional
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applications information and documentation.
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2. COPYRIGHT LICENSE
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Redistribution and use in source and binary forms, with or without modification, are permitted without
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payment of copyright license fees provided that you satisfy the following conditions:
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You must retain the complete text of this software license in redistributions of the FDK AAC Codec or
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your modifications thereto in source code form.
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You must retain the complete text of this software license in the documentation and/or other materials
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provided with redistributions of the FDK AAC Codec or your modifications thereto in binary form.
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You must make available free of charge copies of the complete source code of the FDK AAC Codec and your
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modifications thereto to recipients of copies in binary form.
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The name of Fraunhofer may not be used to endorse or promote products derived from this library without
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prior written permission.
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You may not charge copyright license fees for anyone to use, copy or distribute the FDK AAC Codec
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software or your modifications thereto.
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Your modified versions of the FDK AAC Codec must carry prominent notices stating that you changed the software
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and the date of any change. For modified versions of the FDK AAC Codec, the term
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"Fraunhofer FDK AAC Codec Library for Android" must be replaced by the term
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"Third-Party Modified Version of the Fraunhofer FDK AAC Codec Library for Android."
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3. NO PATENT LICENSE
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NO EXPRESS OR IMPLIED LICENSES TO ANY PATENT CLAIMS, including without limitation the patents of Fraunhofer,
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ARE GRANTED BY THIS SOFTWARE LICENSE. Fraunhofer provides no warranty of patent non-infringement with
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respect to this software.
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You may use this FDK AAC Codec software or modifications thereto only for purposes that are authorized
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by appropriate patent licenses.
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4. DISCLAIMER
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This FDK AAC Codec software is provided by Fraunhofer on behalf of the copyright holders and contributors
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"AS IS" and WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, including but not limited to the implied warranties
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of merchantability and fitness for a particular purpose. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
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CONTRIBUTORS BE LIABLE for any direct, indirect, incidental, special, exemplary, or consequential damages,
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including but not limited to procurement of substitute goods or services; loss of use, data, or profits,
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or business interruption, however caused and on any theory of liability, whether in contract, strict
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liability, or tort (including negligence), arising in any way out of the use of this software, even if
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advised of the possibility of such damage.
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5. CONTACT INFORMATION
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Fraunhofer Institute for Integrated Circuits IIS
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Attention: Audio and Multimedia Departments - FDK AAC LL
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Am Wolfsmantel 33
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91058 Erlangen, Germany
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www.iis.fraunhofer.de/amm
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amm-info@iis.fraunhofer.de
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----------------------------------------------------------------------------------------------------------- */
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/******************************** MPEG Audio Encoder **************************
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Initial author:
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contents/description: CRC calculation
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******************************************************************************/
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#ifndef FDK_CRC_H
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#define FDK_CRC_H
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#include "FDK_bitstream.h"
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#define MAX_CRC_REGS 3 /*!< Maximal number of overlapping crc region in ADTS channel pair element is two.
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Select three independent regions preventively. */
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/**
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* This structure describes single crc region used for crc calculation.
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*/
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typedef struct
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{
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UCHAR isActive;
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INT maxBits;
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UINT bitBufCntBits;
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UINT validBits;
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} CCrcRegData;
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/**
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* CRC info structure.
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*/
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typedef struct
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{
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CCrcRegData crcRegData[MAX_CRC_REGS]; /*!< Multiple crc region description. */
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const USHORT *pCrcLookup; /*!< Pointer to lookup table filled in FDK_crcInit(). */
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USHORT crcPoly; /*!< CRC generator polynom. */
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USHORT crcMask; /*!< CRC mask. */
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USHORT startValue; /*!< CRC start value. */
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UCHAR crcLen; /*!< CRC length. */
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UINT regStart; /*!< Start region marker for synchronization. */
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UINT regStop; /*!< Stop region marker for synchronization. */
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USHORT crcValue; /*!< Crc value to be calculated. */
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} FDK_CRCINFO;
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/**
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* CRC info handle.
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*/
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typedef FDK_CRCINFO* HANDLE_FDK_CRCINFO;
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/**
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* \brief Initialize CRC structure.
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*
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* The function initializes existing crc info structure with denoted configuration.
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*
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* \param hCrcInfo Pointer to an outlying allocated crc info structure.
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* \param crcPoly Configure crc polynom.
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* \param crcStartValue Configure crc start value.
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* \param crcLen Configure crc length.
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*
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* \return none
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*/
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void FDKcrcInit(
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HANDLE_FDK_CRCINFO hCrcInfo,
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const UINT crcPoly,
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const UINT crcStartValue,
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const UINT crcLen
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);
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/**
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* \brief Reset CRC info structure.
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*
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* This function clears all intern states of the crc structure.
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*
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* \param hCrcInfo Pointer to crc info stucture.
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*
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* \return none
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*/
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void FDKcrcReset(
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HANDLE_FDK_CRCINFO hCrcInfo
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);
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/**
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* \brief Start CRC region with maximum number of bits.
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*
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* This function marks position in bitstream to be used as start point for crc calculation.
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* Bitstream range for crc calculation can be limited or kept dynamic depending on mBits parameter.
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* The crc region has to be terminated with FDKcrcEndReg() in each case.
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*
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* \param hCrcInfo Pointer to crc info stucture.
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* \param hBs Pointer to current bit buffer structure.
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* \param mBits Number of bits in crc region to be calculated.
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* - mBits > 0: Zero padding will be used for CRC calculation, if there
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* are less than mBits bits available.
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* - mBits < 0: No zero padding is done.
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* - mBits = 0: The number of bits used in crc calculation is dynamically,
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* depending on bitstream position between FDKcrcStartReg() and
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* FDKcrcEndReg() call.
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*
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* \return ID for the created region, -1 in case of an error
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*/
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INT FDKcrcStartReg(
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HANDLE_FDK_CRCINFO hCrcInfo,
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const HANDLE_FDK_BITSTREAM hBs,
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const INT mBits
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);
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/**
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* \brief Ends CRC region.
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*
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* This function terminates crc region specified with FDKcrcStartReg(). The number of bits in crc region depends
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* on mBits parameter of FDKcrcStartReg().
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* This function calculates and updates crc in info structure.
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*
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* \param hCrcInfo Pointer to crc info stucture.
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* \param hBs Pointer to current bit buffer structure.
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* \param reg Crc region ID created in FDKcrcStartReg().
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*
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* \return 0 on success
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*/
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INT FDKcrcEndReg(
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HANDLE_FDK_CRCINFO hCrcInfo,
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const HANDLE_FDK_BITSTREAM hBs,
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const INT reg
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);
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/**
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* \brief This function returns crc value from info struct.
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*
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* \param hCrcInfo Pointer to crc info stucture.
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*
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* \return CRC value masked with crc length.
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*/
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USHORT FDKcrcGetCRC(
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const HANDLE_FDK_CRCINFO hCrcInfo
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);
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#endif /* FDK_CRC_H */
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