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+
+/* -----------------------------------------------------------------------------------------------------------
+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 */