Fraunhofer AAC codec.

License boilerplate update to follow.

Change-Id: I2810460c11a58b6d148d84673cc031f3685e79b5

1 files changed, 169 insertions, 0 deletions

diff --git a/libFDK/include/FDK_crc.h b/libFDK/include/FDK_crc.h
new file mode 100644
index 0000000..29ae6c5
--- /dev/null
+++ b/libFDK/include/FDK_crc.h
@@ -0,0 +1,169 @@
+/******************************** 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 */