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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
------------------------------------------------------------------------------ */
-
-/**************************** SBR decoder library ******************************
-
- Author(s):
-
- Description:
-
-*******************************************************************************/
-
-/*!
- \file
- \brief CRC check coutines
-*/
-
-#include "sbr_crc.h"
-
-#include "FDK_bitstream.h"
-#include "transcendent.h"
-
-#define MAXCRCSTEP 16
-#define MAXCRCSTEP_LD 4
-
-/*!
- \brief crc calculation
-*/
-static ULONG calcCRC(HANDLE_CRC hCrcBuf, ULONG bValue, int nBits) {
- int i;
- ULONG bMask = (1UL << (nBits - 1));
-
- for (i = 0; i < nBits; i++, bMask >>= 1) {
- USHORT flag = (hCrcBuf->crcState & hCrcBuf->crcMask) ? 1 : 0;
- USHORT flag1 = (bMask & bValue) ? 1 : 0;
-
- flag ^= flag1;
- hCrcBuf->crcState <<= 1;
- if (flag) hCrcBuf->crcState ^= hCrcBuf->crcPoly;
- }
-
- return (hCrcBuf->crcState);
-}
-
-/*!
- \brief crc
-*/
-static int getCrc(HANDLE_FDK_BITSTREAM hBs, ULONG NrBits) {
- int i;
- CRC_BUFFER CrcBuf;
-
- CrcBuf.crcState = SBR_CRC_START;
- CrcBuf.crcPoly = SBR_CRC_POLY;
- CrcBuf.crcMask = SBR_CRC_MASK;
-
- int CrcStep = NrBits >> MAXCRCSTEP_LD;
-
- int CrcNrBitsRest = (NrBits - CrcStep * MAXCRCSTEP);
- ULONG bValue;
-
- for (i = 0; i < CrcStep; i++) {
- bValue = FDKreadBits(hBs, MAXCRCSTEP);
- calcCRC(&CrcBuf, bValue, MAXCRCSTEP);
- }
-
- bValue = FDKreadBits(hBs, CrcNrBitsRest);
- calcCRC(&CrcBuf, bValue, CrcNrBitsRest);
-
- return (CrcBuf.crcState & SBR_CRC_RANGE);
-}
-
-/*!
- \brief crc interface
- \return 1: CRC OK, 0: CRC check failure
-*/
-int SbrCrcCheck(HANDLE_FDK_BITSTREAM hBs, /*!< handle to bit-buffer */
- LONG NrBits) /*!< max. CRC length */
-{
- int crcResult = 1;
- ULONG NrCrcBits;
- ULONG crcCheckResult;
- LONG NrBitsAvailable;
- ULONG crcCheckSum;
-
- crcCheckSum = FDKreadBits(hBs, 10);
-
- NrBitsAvailable = FDKgetValidBits(hBs);
- if (NrBitsAvailable <= 0) {
- return 0;
- }
-
- NrCrcBits = fixMin((INT)NrBits, (INT)NrBitsAvailable);
-
- crcCheckResult = getCrc(hBs, NrCrcBits);
- FDKpushBack(hBs, (NrBitsAvailable - FDKgetValidBits(hBs)));
-
- if (crcCheckResult != crcCheckSum) {
- crcResult = 0;
- }
-
- return (crcResult);
-}