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+/* -----------------------------------------------------------------------------
+Software License for The Fraunhofer FDK AAC Codec Library for Android
+
+© Copyright  1995 - 2018 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
+----------------------------------------------------------------------------- */
+
+/******************* Library for basic calculation routines ********************
+
+   Author(s):
+
+   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;
+  INT bitBufCntBits;
+  INT 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 */