Fraunhofer AAC codec.

License boilerplate update to follow.

Change-Id: I2810460c11a58b6d148d84673cc031f3685e79b5

1 files changed, 192 insertions, 0 deletions

diff --git a/libSBRenc/src/env_bit.cpp b/libSBRenc/src/env_bit.cpp
new file mode 100644
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+++ b/libSBRenc/src/env_bit.cpp
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+/****************************************************************************
+
+                       (C) copyright Fraunhofer-IIS (2004)
+                               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.
+
+ $Id$
+
+*******************************************************************************/
+/*!
+  \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);
+}
+