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+
+/* -----------------------------------------------------------------------------------------------------------
+Software License for The Fraunhofer FDK AAC Codec Library for Android
+
+© Copyright  1995 - 2012 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);
+}
+