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authorDave Burke <daveburke@google.com>2012-04-17 09:51:45 -0700
committerDave Burke <daveburke@google.com>2012-04-17 23:04:43 -0700
commit9bf37cc9712506b2483650c82d3c41152337ef7e (patch)
tree77db44e2bae06e3d144b255628be2b7a55c581d3 /libFDK/include/FDK_crc.h
parenta37315fe10ee143d6d0b28c19d41a476a23e63ea (diff)
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Fraunhofer AAC codec.
License boilerplate update to follow. Change-Id: I2810460c11a58b6d148d84673cc031f3685e79b5
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+/******************************** MPEG Audio Encoder **************************
+
+ (C) copyright Fraunhofer-IIS (1999)
+ All Rights Reserved
+
+ Please be advised that this software and/or program delivery is
+ Confidential Information of Fraunhofer and subject to and covered by the
+
+ Fraunhofer IIS Software Evaluation Agreement
+ between Google Inc. and Fraunhofer
+ effective and in full force since March 1, 2012.
+
+ You may use this software and/or program only under the terms and
+ conditions described in the above mentioned Fraunhofer IIS Software
+ Evaluation Agreement. Any other and/or further use requires a separate agreement.
+
+
+ This software and/or program is protected by copyright law and international
+ treaties. Any reproduction or distribution of this software and/or program,
+ or any portion of it, may result in severe civil and criminal penalties, and
+ will be prosecuted to the maximum extent possible under law.
+
+ $Id$
+ 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 */