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Diffstat (limited to 'fdk-aac/libSBRdec/src/sbr_crc.cpp')
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diff --git a/fdk-aac/libSBRdec/src/sbr_crc.cpp b/fdk-aac/libSBRdec/src/sbr_crc.cpp deleted file mode 100644 index ba0fd05..0000000 --- a/fdk-aac/libSBRdec/src/sbr_crc.cpp +++ /dev/null @@ -1,192 +0,0 @@ -/* ----------------------------------------------------------------------------- -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); -} |