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-
-/* -----------------------------------------------------------------------------------------------------------
-Software License for The Fraunhofer FDK AAC Codec Library for Android
-
-© Copyright 1995 - 2013 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
------------------------------------------------------------------------------------------------------------ */
-
-/*!
- \file
- \brief Remaining SBR Bit Writing Routines
-*/
-
-#include "env_bit.h"
-#include "cmondata.h"
-
-
-#ifndef min
-#define min(a,b) ( a < b ? a:b)
-#endif
-
-#ifndef max
-#define max(a,b) ( a > b ? a:b)
-#endif
-
-/* ***************************** crcAdvance **********************************/
-/**
- * @fn
- * @brief updates crc data register
- * @return none
- *
- * This function updates the crc register
- *
- */
-static void crcAdvance(USHORT crcPoly,
- USHORT crcMask,
- USHORT *crc,
- ULONG bValue,
- INT bBits
- )
-{
- INT i;
- USHORT flag;
-
- for (i=bBits-1; i>=0; i--) {
- flag = ((*crc) & crcMask) ? (1) : (0) ;
- flag ^= (bValue & (1<<i)) ? (1) : (0) ;
-
- (*crc)<<=1;
- if(flag) (*crc) ^= crcPoly;
- }
-}
-
-
-/* ***************************** FDKsbrEnc_InitSbrBitstream **********************************/
-/**
- * @fn
- * @brief Inittialisation of sbr bitstream, write of dummy header and CRC
- * @return none
- *
- *
- *
- */
-
-INT FDKsbrEnc_InitSbrBitstream(HANDLE_COMMON_DATA hCmonData,
- UCHAR *memoryBase, /*!< Pointer to bitstream buffer */
- INT memorySize, /*!< Length of bitstream buffer in bytes */
- HANDLE_FDK_CRCINFO hCrcInfo,
- UINT sbrSyntaxFlags) /*!< SBR syntax flags */
-{
- INT crcRegion = 0;
-
- /* reset bit buffer */
- FDKresetBitbuffer(&hCmonData->sbrBitbuf, BS_WRITER);
-
- FDKinitBitStream(&hCmonData->tmpWriteBitbuf, memoryBase,
- memorySize, 0, BS_WRITER);
-
- if (sbrSyntaxFlags & SBR_SYNTAX_CRC) {
- if (sbrSyntaxFlags & SBR_SYNTAX_DRM_CRC)
- { /* Init and start CRC region */
- FDKwriteBits (&hCmonData->sbrBitbuf, 0x0, SI_SBR_DRM_CRC_BITS);
- FDKcrcInit( hCrcInfo, 0x001d, 0xFFFF, SI_SBR_DRM_CRC_BITS );
- crcRegion = FDKcrcStartReg( hCrcInfo, &hCmonData->sbrBitbuf, 0 );
- } else {
- FDKwriteBits (&hCmonData->sbrBitbuf, 0x0, SI_SBR_CRC_BITS);
- }
- }
-
- return (crcRegion);
-}
-
-
-/* ************************** FDKsbrEnc_AssembleSbrBitstream *******************************/
-/**
- * @fn
- * @brief Formats the SBR payload
- * @return nothing
- *
- * Also the CRC will be calculated here.
- *
- */
-
-void
-FDKsbrEnc_AssembleSbrBitstream( HANDLE_COMMON_DATA hCmonData,
- HANDLE_FDK_CRCINFO hCrcInfo,
- INT crcRegion,
- UINT sbrSyntaxFlags)
-{
- USHORT crcReg = SBR_CRCINIT;
- INT numCrcBits,i;
-
- /* check if SBR is present */
- if ( hCmonData==NULL )
- return;
-
- hCmonData->sbrFillBits = 0; /* Fill bits are written only for GA streams */
-
- if ( sbrSyntaxFlags & SBR_SYNTAX_DRM_CRC )
- {
- /*
- * Calculate and write DRM CRC
- */
- FDKcrcEndReg( hCrcInfo, &hCmonData->sbrBitbuf, crcRegion );
- FDKwriteBits( &hCmonData->tmpWriteBitbuf, FDKcrcGetCRC(hCrcInfo)^0xFF, SI_SBR_DRM_CRC_BITS );
- }
- else
- {
- if ( !(sbrSyntaxFlags & SBR_SYNTAX_LOW_DELAY) )
- {
- /* Do alignment here, because its defined as part of the sbr_extension_data */
- int sbrLoad = hCmonData->sbrHdrBits + hCmonData->sbrDataBits;
-
- if ( sbrSyntaxFlags & SBR_SYNTAX_CRC ) {
- sbrLoad += SI_SBR_CRC_BITS;
- }
-
- sbrLoad += 4; /* Do byte Align with 4 bit offset. ISO/IEC 14496-3:2005(E) page 39. */
-
- hCmonData->sbrFillBits = (8 - (sbrLoad % 8)) % 8;
-
- /*
- append fill bits
- */
- FDKwriteBits(&hCmonData->sbrBitbuf, 0, hCmonData->sbrFillBits );
-
- FDK_ASSERT(FDKgetValidBits(&hCmonData->sbrBitbuf) % 8 == 4);
- }
-
- /*
- calculate crc
- */
- if ( sbrSyntaxFlags & SBR_SYNTAX_CRC ) {
- FDK_BITSTREAM tmpCRCBuf = hCmonData->sbrBitbuf;
- FDKresetBitbuffer( &tmpCRCBuf, BS_READER );
-
- numCrcBits = hCmonData->sbrHdrBits + hCmonData->sbrDataBits + hCmonData->sbrFillBits;
-
- for(i=0;i<numCrcBits;i++){
- INT bit;
- bit = FDKreadBits(&tmpCRCBuf,1);
- crcAdvance(SBR_CRC_POLY,SBR_CRC_MASK,&crcReg,bit,1);
- }
- crcReg &= (SBR_CRC_RANGE);
-
- /*
- * Write CRC data.
- */
- FDKwriteBits (&hCmonData->tmpWriteBitbuf, crcReg, SI_SBR_CRC_BITS);
- }
- }
-
- FDKsyncCache(&hCmonData->tmpWriteBitbuf);
-}
-