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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
+----------------------------------------------------------------------------- */
+
+/******************* Library for basic calculation routines ********************
+
+   Author(s):   M. Lohwasser
+
+   Description: bitstream interface to bitbuffer routines
+
+*******************************************************************************/
+
+#ifndef FDK_BITSTREAM_H
+#define FDK_BITSTREAM_H
+
+#include "FDK_bitbuffer.h"
+#include "machine_type.h"
+
+#include "genericStds.h"
+
+#define CACHE_BITS 32
+
+#define BUFSIZE_DUMMY_VALUE MAX_BUFSIZE_BYTES
+
+typedef enum { BS_READER, BS_WRITER } FDK_BS_CFG;
+
+typedef struct {
+  UINT CacheWord;
+  UINT BitsInCache;
+  FDK_BITBUF hBitBuf;
+  UINT ConfigCache;
+} FDK_BITSTREAM;
+
+typedef FDK_BITSTREAM *HANDLE_FDK_BITSTREAM;
+
+/**
+ * \brief CreateBitStream Function.
+ *
+ * Create and initialize bitstream with extern allocated buffer.
+ *
+ * \param pBuffer  Pointer to BitBuffer array.
+ * \param bufSize  Length of BitBuffer array. (awaits size 2^n and <=
+ * MAX_BUFSIZE_BYTES)
+ * \param config   Initialize BitStream as Reader or Writer.
+ */
+FDK_INLINE
+HANDLE_FDK_BITSTREAM FDKcreateBitStream(UCHAR *pBuffer, UINT bufSize,
+                                        FDK_BS_CFG config = BS_READER) {
+  HANDLE_FDK_BITSTREAM hBitStream =
+      (HANDLE_FDK_BITSTREAM)FDKcalloc(1, sizeof(FDK_BITSTREAM));
+  if (hBitStream == NULL) return NULL;
+  FDK_InitBitBuffer(&hBitStream->hBitBuf, pBuffer, bufSize, 0);
+
+  /* init cache */
+  hBitStream->CacheWord = hBitStream->BitsInCache = 0;
+  hBitStream->ConfigCache = config;
+
+  return hBitStream;
+}
+
+/**
+ * \brief Initialize BistreamBuffer. BitBuffer can point to filled BitBuffer
+ * array .
+ *
+ * \param hBitStream HANDLE_FDK_BITSTREAM handle
+ * \param pBuffer    Pointer to BitBuffer array.
+ * \param bufSize    Length of BitBuffer array in bytes. (awaits size 2^n and <=
+ * MAX_BUFSIZE_BYTES)
+ * \param validBits  Number of valid BitBuffer filled Bits.
+ * \param config     Initialize BitStream as Reader or Writer.
+ * \return void
+ */
+FDK_INLINE
+void FDKinitBitStream(HANDLE_FDK_BITSTREAM hBitStream, UCHAR *pBuffer,
+                      UINT bufSize, UINT validBits,
+                      FDK_BS_CFG config = BS_READER) {
+  FDK_InitBitBuffer(&hBitStream->hBitBuf, pBuffer, bufSize, validBits);
+
+  /* init cache */
+  hBitStream->CacheWord = hBitStream->BitsInCache = 0;
+  hBitStream->ConfigCache = config;
+}
+
+/**
+ * \brief ResetBitbuffer Function. Reset states in BitBuffer and Cache.
+ *
+ * \param hBitStream HANDLE_FDK_BITSTREAM handle
+ * \param config     Initialize BitStream as Reader or Writer.
+ * \return void
+ */
+FDK_INLINE void FDKresetBitbuffer(HANDLE_FDK_BITSTREAM hBitStream,
+                                  FDK_BS_CFG config = BS_READER) {
+  FDK_ResetBitBuffer(&hBitStream->hBitBuf);
+
+  /* init cache */
+  hBitStream->CacheWord = hBitStream->BitsInCache = 0;
+  hBitStream->ConfigCache = config;
+}
+
+/** DeleteBitStream.
+
+    Deletes the in Create Bitstream allocated BitStream and BitBuffer.
+*/
+FDK_INLINE void FDKdeleteBitStream(HANDLE_FDK_BITSTREAM hBitStream) {
+  FDK_DeleteBitBuffer(&hBitStream->hBitBuf);
+  FDKfree(hBitStream);
+}
+
+/**
+ * \brief ReadBits Function (forward). This function returns a number of
+ * sequential bits from the input bitstream.
+ *
+ * \param hBitStream HANDLE_FDK_BITSTREAM handle
+ * \param numberOfBits  The number of bits to be retrieved. ( (0),1 <=
+ * numberOfBits <= 32)
+ * \return the requested bits, right aligned
+ * \return
+ */
+
+FDK_INLINE UINT FDKreadBits(HANDLE_FDK_BITSTREAM hBitStream,
+                            const UINT numberOfBits) {
+  UINT bits = 0;
+  INT missingBits = (INT)numberOfBits - (INT)hBitStream->BitsInCache;
+
+  FDK_ASSERT(numberOfBits <= 32);
+  if (missingBits > 0) {
+    if (missingBits != 32) bits = hBitStream->CacheWord << missingBits;
+    hBitStream->CacheWord = FDK_get32(&hBitStream->hBitBuf);
+    hBitStream->BitsInCache += CACHE_BITS;
+  }
+
+  hBitStream->BitsInCache -= numberOfBits;
+
+  return (bits | (hBitStream->CacheWord >> hBitStream->BitsInCache)) &
+         BitMask[numberOfBits];
+}
+
+FDK_INLINE UINT FDKreadBit(HANDLE_FDK_BITSTREAM hBitStream) {
+  if (!hBitStream->BitsInCache) {
+    hBitStream->CacheWord = FDK_get32(&hBitStream->hBitBuf);
+    hBitStream->BitsInCache = CACHE_BITS - 1;
+    return hBitStream->CacheWord >> 31;
+  }
+  hBitStream->BitsInCache--;
+
+  return (hBitStream->CacheWord >> hBitStream->BitsInCache) & 1;
+}
+
+/**
+ * \brief Read2Bits Function (forward). This function reads 2 sequential
+ *        bits from the input bitstream. It is the optimized version
+          of FDKreadBits() for reading 2 bits.
+ *
+ * \param hBitStream HANDLE_FDK_BITSTREAM handle
+ * \return the requested bits, right aligned
+ * \return
+ */
+FDK_INLINE UINT FDKread2Bits(HANDLE_FDK_BITSTREAM hBitStream) {
+  /*
+  ** Version corresponds to optimized FDKreadBits implementation
+  ** calling FDK_get32, that keeps read pointer aligned.
+  */
+  UINT bits = 0;
+  INT missingBits = 2 - (INT)hBitStream->BitsInCache;
+  if (missingBits > 0) {
+    bits = hBitStream->CacheWord << missingBits;
+    hBitStream->CacheWord = FDK_get32(&hBitStream->hBitBuf);
+    hBitStream->BitsInCache += CACHE_BITS;
+  }
+
+  hBitStream->BitsInCache -= 2;
+
+  return (bits | (hBitStream->CacheWord >> hBitStream->BitsInCache)) & 0x3;
+}
+
+/**
+ * \brief ReadBits Function (backward). This function returns a number of
+ * sequential bits from the input bitstream.
+ *
+ * \param hBitStream HANDLE_FDK_BITSTREAM handle
+ * \param numberOfBits  The number of bits to be retrieved.
+ * \return the requested bits, right aligned
+ */
+FDK_INLINE UINT FDKreadBitsBwd(HANDLE_FDK_BITSTREAM hBitStream,
+                               const UINT numberOfBits) {
+  const UINT validMask = BitMask[numberOfBits];
+
+  if (hBitStream->BitsInCache <= numberOfBits) {
+    const INT freeBits = (CACHE_BITS - 1) - hBitStream->BitsInCache;
+
+    hBitStream->CacheWord = (hBitStream->CacheWord << freeBits) |
+                            FDK_getBwd(&hBitStream->hBitBuf, freeBits);
+    hBitStream->BitsInCache += freeBits;
+  }
+
+  hBitStream->BitsInCache -= numberOfBits;
+
+  return (hBitStream->CacheWord >> hBitStream->BitsInCache) & validMask;
+}
+
+/**
+ * \brief read an integer value using a varying number of bits from the
+ * bitstream
+ *
+ *        q.v. ISO/IEC FDIS 23003-3  Table 16
+ *
+ * \param hBitStream HANDLE_FDK_BITSTREAM handle
+ * \param nBits1  number of bits to read for a small integer value or escape
+ * value
+ * \param nBits2  number of bits to read for a medium sized integer value or
+ * escape value
+ * \param nBits3  number of bits to read for a large integer value
+ * \return integer value read from bitstream
+ */
+FDK_INLINE UINT escapedValue(HANDLE_FDK_BITSTREAM hBitStream, int nBits1,
+                             int nBits2, int nBits3) {
+  UINT value = FDKreadBits(hBitStream, nBits1);
+
+  if (value == (UINT)(1 << nBits1) - 1) {
+    UINT valueAdd = FDKreadBits(hBitStream, nBits2);
+    value += valueAdd;
+    if (valueAdd == (UINT)(1 << nBits2) - 1) {
+      value += FDKreadBits(hBitStream, nBits3);
+    }
+  }
+
+  return value;
+}
+
+/**
+ * \brief return a number of bits from the bitBuffer.
+ *        You have to know what you do! Cache has to be synchronized before
+ * using this function.
+ *
+ * \param hBitStream HANDLE_FDK_BITSTREAM handle
+ * \param numBits The number of bits to be retrieved.
+ * \return the requested bits, right aligned
+ */
+FDK_INLINE UINT FDKgetBits(HANDLE_FDK_BITSTREAM hBitStream, UINT numBits) {
+  return FDK_get(&hBitStream->hBitBuf, numBits);
+}
+
+/**
+ * \brief WriteBits Function. This function writes numberOfBits of value into
+ * bitstream.
+ *
+ * \param hBitStream HANDLE_FDK_BITSTREAM handle
+ * \param value         The data to be written
+ * \param numberOfBits  The number of bits to be written
+ * \return              Number of bits written
+ */
+FDK_INLINE UCHAR FDKwriteBits(HANDLE_FDK_BITSTREAM hBitStream, UINT value,
+                              const UINT numberOfBits) {
+  const UINT validMask = BitMask[numberOfBits];
+
+  if (hBitStream == NULL) {
+    return numberOfBits;
+  }
+
+  if ((hBitStream->BitsInCache + numberOfBits) < CACHE_BITS) {
+    hBitStream->BitsInCache += numberOfBits;
+    hBitStream->CacheWord =
+        (hBitStream->CacheWord << numberOfBits) | (value & validMask);
+  } else {
+    /* Put always 32 bits into memory             */
+    /* - fill cache's LSBits with MSBits of value */
+    /* - store 32 bits in memory using subroutine */
+    /* - fill remaining bits into cache's LSBits  */
+    /* - upper bits in cache are don't care       */
+
+    /* Compute number of bits to be filled into cache */
+    int missing_bits = CACHE_BITS - hBitStream->BitsInCache;
+    int remaining_bits = numberOfBits - missing_bits;
+    value = value & validMask;
+    /* Avoid shift left by 32 positions */
+    UINT CacheWord =
+        (missing_bits == 32) ? 0 : (hBitStream->CacheWord << missing_bits);
+    CacheWord |= (value >> (remaining_bits));
+    FDK_put(&hBitStream->hBitBuf, CacheWord, 32);
+
+    hBitStream->CacheWord = value;
+    hBitStream->BitsInCache = remaining_bits;
+  }
+
+  return numberOfBits;
+}
+
+/**
+ * \brief WriteBits Function (backward). This function writes numberOfBits of
+ * value into bitstream.
+ *
+ * \param hBitStream HANDLE_FDK_BITSTREAM handle
+ * \param value         Variable holds data to be written.
+ * \param numberOfBits  The number of bits to be written.
+ * \return number of bits written
+ */
+FDK_INLINE UCHAR FDKwriteBitsBwd(HANDLE_FDK_BITSTREAM hBitStream, UINT value,
+                                 const UINT numberOfBits) {
+  const UINT validMask = BitMask[numberOfBits];
+
+  if ((hBitStream->BitsInCache + numberOfBits) <= CACHE_BITS) {
+    hBitStream->BitsInCache += numberOfBits;
+    hBitStream->CacheWord =
+        (hBitStream->CacheWord << numberOfBits) | (value & validMask);
+  } else {
+    FDK_putBwd(&hBitStream->hBitBuf, hBitStream->CacheWord,
+               hBitStream->BitsInCache);
+    hBitStream->BitsInCache = numberOfBits;
+    hBitStream->CacheWord = (value & validMask);
+  }
+
+  return numberOfBits;
+}
+
+/**
+ * \brief write an integer value using a varying number of bits from the
+ * bitstream
+ *
+ *        q.v. ISO/IEC FDIS 23003-3  Table 16
+ *
+ * \param hBitStream HANDLE_FDK_BITSTREAM handle
+ * \param value   the data to be written
+ * \param nBits1  number of bits to write for a small integer value or escape
+ * value
+ * \param nBits2  number of bits to write for a medium sized integer value or
+ * escape value
+ * \param nBits3  number of bits to write for a large integer value
+ * \return number of bits written
+ */
+FDK_INLINE UCHAR FDKwriteEscapedValue(HANDLE_FDK_BITSTREAM hBitStream,
+                                      UINT value, UINT nBits1, UINT nBits2,
+                                      UINT nBits3) {
+  UCHAR nbits = 0;
+  UINT tmp = (1 << nBits1) - 1;
+
+  if (value < tmp) {
+    nbits += FDKwriteBits(hBitStream, value, nBits1);
+  } else {
+    nbits += FDKwriteBits(hBitStream, tmp, nBits1);
+    value -= tmp;
+    tmp = (1 << nBits2) - 1;
+
+    if (value < tmp) {
+      nbits += FDKwriteBits(hBitStream, value, nBits2);
+    } else {
+      nbits += FDKwriteBits(hBitStream, tmp, nBits2);
+      value -= tmp;
+
+      nbits += FDKwriteBits(hBitStream, value, nBits3);
+    }
+  }
+
+  return nbits;
+}
+
+/**
+ * \brief SyncCache Function. Clear cache after read forward.
+ *
+ * \param hBitStream HANDLE_FDK_BITSTREAM handle
+ * \return void
+ */
+FDK_INLINE void FDKsyncCache(HANDLE_FDK_BITSTREAM hBitStream) {
+  if (hBitStream->ConfigCache == BS_READER)
+    FDK_pushBack(&hBitStream->hBitBuf, hBitStream->BitsInCache,
+                 hBitStream->ConfigCache);
+  else if (hBitStream->BitsInCache) /* BS_WRITER */
+    FDK_put(&hBitStream->hBitBuf, hBitStream->CacheWord,
+            hBitStream->BitsInCache);
+
+  hBitStream->BitsInCache = 0;
+  hBitStream->CacheWord = 0;
+}
+
+/**
+ * \brief SyncCache Function. Clear cache after read backwards.
+ *
+ * \param  hBitStream HANDLE_FDK_BITSTREAM handle
+ * \return void
+ */
+FDK_INLINE void FDKsyncCacheBwd(HANDLE_FDK_BITSTREAM hBitStream) {
+  if (hBitStream->ConfigCache == BS_READER) {
+    FDK_pushForward(&hBitStream->hBitBuf, hBitStream->BitsInCache,
+                    hBitStream->ConfigCache);
+  } else { /* BS_WRITER */
+    FDK_putBwd(&hBitStream->hBitBuf, hBitStream->CacheWord,
+               hBitStream->BitsInCache);
+  }
+
+  hBitStream->BitsInCache = 0;
+  hBitStream->CacheWord = 0;
+}
+
+/**
+ * \brief Byte Alignment Function with anchor
+ *        This function performs the byte_alignment() syntactic function on the
+ * input stream, i.e. some bits will be discarded so that the next bits to be
+ * read/written would be aligned on a byte boundary with respect to the
+ * given alignment anchor.
+ *
+ * \param hBitStream HANDLE_FDK_BITSTREAM handle
+ * \param alignmentAnchor bit position to be considered as origin for byte
+ * alignment
+ * \return void
+ */
+FDK_INLINE void FDKbyteAlign(HANDLE_FDK_BITSTREAM hBitStream,
+                             UINT alignmentAnchor) {
+  FDKsyncCache(hBitStream);
+  if (hBitStream->ConfigCache == BS_READER) {
+    FDK_pushForward(
+        &hBitStream->hBitBuf,
+        (UINT)((INT)8 - (((INT)alignmentAnchor -
+                          (INT)FDK_getValidBits(&hBitStream->hBitBuf)) &
+                         0x07)) &
+            0x07,
+        hBitStream->ConfigCache);
+  } else {
+    FDK_put(&hBitStream->hBitBuf, 0,
+            (8 - ((FDK_getValidBits(&hBitStream->hBitBuf) - alignmentAnchor) &
+                  0x07)) &
+                0x07);
+  }
+}
+
+/**
+ * \brief Push Back(Cache) / For / BiDirectional Function.
+ *        PushBackCache function ungets a number of bits erroneously
+ * read/written by the last Get() call. NB: The number of bits to be stuffed
+ * back into the stream may never exceed the number of bits returned by
+ * the immediately preceding Get() call.
+ *
+ *       PushBack function ungets a number of bits (combines cache and bitbuffer
+ * indices) PushFor  function gets a number of bits (combines cache and
+ * bitbuffer indices) PushBiDirectional gets/ungets number of bits as
+ * defined in PusBack/For function NB: The sign of bits is not known, so
+ * the function checks direction and calls appropriate function. (positive
+ * sign pushFor, negative sign pushBack )
+ *
+ * \param hBitStream HANDLE_FDK_BITSTREAM handle
+ * \param numberOfBits  The number of bits to be pushed back/for.
+ * \return void
+ */
+FDK_INLINE void FDKpushBackCache(HANDLE_FDK_BITSTREAM hBitStream,
+                                 const UINT numberOfBits) {
+  FDK_ASSERT((hBitStream->BitsInCache + numberOfBits) <= CACHE_BITS);
+  hBitStream->BitsInCache += numberOfBits;
+}
+
+FDK_INLINE void FDKpushBack(HANDLE_FDK_BITSTREAM hBitStream,
+                            const UINT numberOfBits) {
+  if ((hBitStream->BitsInCache + numberOfBits) < CACHE_BITS &&
+      (hBitStream->ConfigCache == BS_READER)) {
+    hBitStream->BitsInCache += numberOfBits;
+    FDKsyncCache(hBitStream); /* sync cache to avoid invalid cache */
+  } else {
+    FDKsyncCache(hBitStream);
+    FDK_pushBack(&hBitStream->hBitBuf, numberOfBits, hBitStream->ConfigCache);
+  }
+}
+
+FDK_INLINE void FDKpushFor(HANDLE_FDK_BITSTREAM hBitStream,
+                           const UINT numberOfBits) {
+  if ((hBitStream->BitsInCache > numberOfBits) &&
+      (hBitStream->ConfigCache == BS_READER)) {
+    hBitStream->BitsInCache -= numberOfBits;
+  } else {
+    FDKsyncCache(hBitStream);
+    FDK_pushForward(&hBitStream->hBitBuf, numberOfBits,
+                    hBitStream->ConfigCache);
+  }
+}
+
+FDK_INLINE void FDKpushBiDirectional(HANDLE_FDK_BITSTREAM hBitStream,
+                                     const INT numberOfBits) {
+  if (numberOfBits >= 0)
+    FDKpushFor(hBitStream, numberOfBits);
+  else
+    FDKpushBack(hBitStream, -numberOfBits);
+}
+
+/**
+ * \brief GetValidBits Function.  Clear cache and return valid Bits from
+ * Bitbuffer.
+ * \param hBitStream HANDLE_FDK_BITSTREAM handle
+ * \return amount of valid bits that still can be read or were already written.
+ *
+ */
+FDK_INLINE UINT FDKgetValidBits(HANDLE_FDK_BITSTREAM hBitStream) {
+  FDKsyncCache(hBitStream);
+  return FDK_getValidBits(&hBitStream->hBitBuf);
+}
+
+/**
+ * \brief return amount of unused Bits from Bitbuffer.
+ * \param hBitStream HANDLE_FDK_BITSTREAM handle
+ * \return amount of free bits that still can be written into the bitstream
+ */
+FDK_INLINE INT FDKgetFreeBits(HANDLE_FDK_BITSTREAM hBitStream) {
+  return FDK_getFreeBits(&hBitStream->hBitBuf);
+}
+
+/**
+ * \brief Fill the BitBuffer with a number of input bytes from  external source.
+ *        The bytesValid variable returns the number of ramaining valid bytes in
+ * extern inputBuffer.
+ *
+ * \param hBitStream  HANDLE_FDK_BITSTREAM handle
+ * \param inputBuffer Pointer to input buffer with bitstream data.
+ * \param bufferSize  Total size of inputBuffer array.
+ * \param bytesValid  Input: number of valid bytes in inputBuffer. Output: bytes
+ * still left unread in inputBuffer.
+ * \return void
+ */
+FDK_INLINE void FDKfeedBuffer(HANDLE_FDK_BITSTREAM hBitStream,
+                              const UCHAR inputBuffer[], const UINT bufferSize,
+                              UINT *bytesValid) {
+  FDKsyncCache(hBitStream);
+  FDK_Feed(&hBitStream->hBitBuf, inputBuffer, bufferSize, bytesValid);
+}
+
+/**
+ * \brief fill destination BitBuffer with a number of bytes from source
+ * BitBuffer. The bytesValid variable returns the number of ramaining valid
+ * bytes in source BitBuffer.
+ *
+ * \param hBSDst            HANDLE_FDK_BITSTREAM handle to write data into
+ * \param hBSSrc            HANDLE_FDK_BITSTREAM handle to read data from
+ * \param bytesValid        Input: number of valid bytes in inputBuffer. Output:
+ * bytes still left unread in inputBuffer.
+ * \return void
+ */
+FDK_INLINE void FDKcopyBuffer(HANDLE_FDK_BITSTREAM hBSDst,
+                              HANDLE_FDK_BITSTREAM hBSSrc, UINT *bytesValid) {
+  FDKsyncCache(hBSSrc);
+  FDK_Copy(&hBSDst->hBitBuf, &hBSSrc->hBitBuf, bytesValid);
+}
+
+/**
+ * \brief fill the outputBuffer with all valid bytes hold in BitBuffer. The
+ * WriteBytes variable returns the number of written Bytes.
+ *
+ * \param hBitStream    HANDLE_FDK_BITSTREAM handle
+ * \param outputBuffer  Pointer to output buffer.
+ * \param writeBytes    Number of bytes write to output buffer.
+ * \return void
+ */
+FDK_INLINE void FDKfetchBuffer(HANDLE_FDK_BITSTREAM hBitStream,
+                               UCHAR *outputBuffer, UINT *writeBytes) {
+  FDKsyncCache(hBitStream);
+  FDK_Fetch(&hBitStream->hBitBuf, outputBuffer, writeBytes);
+}
+
+#endif