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+//
+// C++ Interface: %{MODULE}
+//
+// Description: 
+//
+//
+// Author: %{AUTHOR} <%{EMAIL}>, (C) %{YEAR}
+//
+// Copyright: See COPYING file that comes with this distribution
+//
+//
+
+#ifndef TNet_Features_h
+#define TNet_Features_h
+
+//*****************************************************************************
+//*****************************************************************************
+// Standard includes
+//
+#include <list>
+#include <queue>
+#include <string>
+
+
+//*****************************************************************************
+//*****************************************************************************
+// Specific includes
+//
+#include "Common.h"
+#include "Matrix.h"
+#include "StkStream.h"
+#include "Types.h"
+#include "Timer.h"
+
+
+
+// we need these for reading and writing
+#define UINT_16  unsigned short
+#define UINT_32  unsigned
+#define INT_16   short
+#define INT_32   int
+#define FLOAT_32 float
+#define DOUBLE_64 double
+
+
+#define PARAMKIND_WAVEFORM  0
+#define PARAMKIND_LPC       1
+#define PARAMKIND_LPREFC    2
+#define PARAMKIND_LPCEPSTRA 3
+#define PARAMKIND_LPDELCEP  4
+#define PARAMKIND_IREFC     5
+#define PARAMKIND_MFCC      6
+#define PARAMKIND_FBANK     7
+#define PARAMKIND_MELSPEC   8
+#define PARAMKIND_USER      9
+#define PARAMKIND_DISCRETE 10
+#define PARAMKIND_PLP      11
+#define PARAMKIND_ANON     12
+
+#define PARAMKIND_E   0000100 /// has energy
+#define PARAMKIND_N   0000200 /// absolute energy suppressed
+#define PARAMKIND_D   0000400 /// has delta coefficients
+#define PARAMKIND_A   0001000 /// has acceleration coefficients
+#define PARAMKIND_C   0002000 /// is compressed
+#define PARAMKIND_Z   0004000 /// has zero mean static coef.
+#define PARAMKIND_K   0010000 /// has CRC checksum
+#define PARAMKIND_0   0020000 /// has 0'th cepstral coef.
+#define PARAMKIND_V   0040000 /// has VQ codebook index
+#define PARAMKIND_T   0100000 /// has triple delta coefficients
+
+
+//*****************************************************************************
+//*****************************************************************************
+// Code ...
+//
+
+namespace TNet
+{
+
+  /** **************************************************************************
+   ** **************************************************************************
+   */
+  class FileListElem
+  {
+  private:
+    std::string         mLogical;     ///< Logical file name representation
+    std::string         mPhysical;    ///< Pysical file name representation
+    float               mWeight;
+    
+  public:
+    FileListElem(const std::string & rFileName);
+    ~FileListElem() {}
+    
+    const std::string &
+    Logical() const { return mLogical; }
+
+    const std::string &
+    Physical() const { return mPhysical; }
+
+    const float&
+    Weight() const { return mWeight; }
+  };
+
+  /** *************************************************************************
+   * @brief 
+   */
+  class FeatureRepository
+  {
+  public:
+    /** 
+     * @brief HTK parameter file header (see HTK manual)
+     */
+    struct HtkHeader
+    {
+      int   mNSamples;
+      int   mSamplePeriod;
+      short mSampleSize;
+      short mSampleKind;
+
+      HtkHeader() 
+       : mNSamples(0),mSamplePeriod(100000),mSampleSize(0),mSampleKind(12)
+      { }
+    };
+
+
+    /**
+     *     @brief Extension of the HTK header
+     */
+    struct HtkHeaderExt
+    {
+      int mHeaderSize;
+      int mVersion;
+      int mSampSize;
+    };
+
+
+    /** 
+     * @brief Normalization file type
+     */
+    enum CNFileType
+    {
+      CNF_Mean,
+      CNF_Variance,
+      CNF_VarScale
+    };
+
+
+    static int     
+    ReadParmKind(const char *pStr, bool checkBrackets);
+
+    static int     
+    ParmKind2Str(unsigned parmKind, char *pOutstr);
+
+    static void 
+    ReadCepsNormFile(
+        const char*   pFileName,
+        char**        lastFile,
+        BaseFloat**   vecBuff,
+        int           sampleKind,
+        CNFileType    type,
+        int           coefs);
+
+    static const char mpParmKindNames[13][16];
+
+  
+  
+  //////////////////////////////////////////////////////////////////////////////
+  //  PUBLIC SECTION
+  //////////////////////////////////////////////////////////////////////////////
+  public:
+    /// Iterates through the list of feature file records
+    typedef   std::list<FileListElem>::iterator  ListIterator;
+
+    // some params for loading features
+    bool                        mSwapFeatures;
+    int                         mStartFrameExt;
+    int                         mEndFrameExt;
+    int                         mTargetKind;
+    int                         mDerivOrder;
+    int*                        mDerivWinLengths;
+    const char*                 mpCvgFile;
+    //:TODO: get rid of these
+    const char*                 mpCmnPath;
+    const char*                 mpCmnMask;
+    const char*                 mpCvnPath;
+    const char*                 mpCvnMask;
+
+    int                         mTrace;
+    
+    
+    // Constructors and destructors
+    /**
+     * @brief Default constructor that creates an empty repository
+     */
+    FeatureRepository() : mDerivWinLengths(NULL), mpCvgFile(NULL), 
+       mpCmnPath(NULL), mpCmnMask(NULL), mpCvnPath(NULL), mpCvnMask(NULL),
+       mTrace(0),
+       mpLastFileName(NULL), mLastFileName(""), mpLastCmnFile (NULL), 
+       mpLastCvnFile (NULL), mpLastCvgFile (NULL), mpCmn(NULL), 
+       mpCvn(NULL), mpCvg(NULL), mpA(NULL), mpB(NULL),
+       mTimeOpen(0), mTimeSeek(0), mTimeRead(0), mTimeNormalize(0) 
+    { 
+      mInputQueueIterator        = mInputQueue.end();
+    }
+
+    /**
+     * @brief Copy constructor which copies filled repository
+     */
+    FeatureRepository(const FeatureRepository& ori)
+     : mDerivWinLengths(NULL), mpCvgFile(NULL), 
+       mpCmnPath(NULL), mpCmnMask(NULL), mpCvnPath(NULL), mpCvnMask(NULL),
+       mTrace(0),
+       mpLastFileName(NULL), mLastFileName(""), mpLastCmnFile (NULL), 
+       mpLastCvnFile (NULL), mpLastCvgFile (NULL), mpCmn(NULL), 
+       mpCvn(NULL), mpCvg(NULL), mpA(NULL), mpB(NULL),
+       mTimeOpen(0), mTimeSeek(0), mTimeRead(0), mTimeNormalize(0) 
+    {
+      //copy all the data from the input queue
+      mInputQueue = ori.mInputQueue;
+
+      //initialize like the original
+      Init(
+        ori.mSwapFeatures,
+        ori.mStartFrameExt,
+        ori.mEndFrameExt,
+        ori.mTargetKind,
+        ori.mDerivOrder,
+        ori.mDerivWinLengths,
+        ori.mpCmnPath,
+        ori.mpCmnMask,
+        ori.mpCvnPath,
+        ori.mpCvnMask,
+        ori.mpCvgFile);
+     
+      //set on the end 
+      mInputQueueIterator        = mInputQueue.end(); 
+      //copy default header values
+      mHeader = ori.mHeader;
+    }
+
+
+    /**
+     * @brief Destroys the repository
+     */
+    ~FeatureRepository()
+    {
+      if (NULL != mpA) {
+        free(mpA);
+      }
+
+      if (NULL != mpB) {
+        free(mpB);
+      }
+      //remove all entries
+      mInputQueue.clear();
+
+      if(mTrace&4) {
+        std::cout << "[FeatureRepository -- open:" << mTimeOpen << "s seek:" << mTimeSeek << "s read:" << mTimeRead << "s normalize:" << mTimeNormalize << "s]\n";
+      }
+
+    }
+
+
+    /**
+     * @brief Initializes the object using the given parameters
+     *
+     * @param swap          Boolean value specifies whether to swap bytes 
+     *                      when reading file or not. 
+     * @param extLeft       Features read from file are extended with extLeft 
+     *                      initial frames. Normally, these frames are 
+     *                      repetitions of the first feature frame in file 
+     *                      (with its derivative, if derivatives are preset in
+     *                      the file). However, if segment of feature frames 
+     *                      is extracted according to range specification, the 
+     *                      true feature frames from beyond the segment boundary
+     *                      are used, wherever it is possible. Note that value 
+     *                      of extLeft can be also negative. In such case
+     *                      corresponding number of initial frames is discarded. 
+     * @param extRight      The paramerer is complementary to parameter extLeft 
+     *                      and has obvious meaning. (Controls extensions over
+     *                      the last frame, last frame from file is repeated 
+     *                      only if necessary).
+     * @param targetKind    The parameters is used to check whether 
+     *                      pHeader->mSampleKind match to requited targetKind 
+     *                      and to control suppression of 0'th cepstral or 
+     *                      energy coefficients accorging to modifiers _E, _0, 
+     *                      and _N. Modifiers _D, _A and _T are ignored; 
+     *                      Computation of derivatives is controled by parameters
+     *                      derivOrder and derivWinLen. Value PARAMKIND_ANON 
+     *                      ensures that function do not result in targetKind 
+     *                      mismatch error and cause no _E or _0 suppression.
+     * @param derivOrder    Final features will be augmented with their 
+     *                      derivatives up to 'derivOrder' order. If 'derivOrder'
+     *                      is negative value, no new derivatives are appended 
+     *                      and derivatives that already present in feature file
+     *                      are preserved.  Straight features are considered 
+     *                      to be of zero order. If some derivatives are already 
+     *                      present in feature file, these are not computed 
+     *                      again, only higher order derivatives are appended 
+     *                      if required. Note, that HTK feature file cannot 
+     *                      contain higher order derivatives (e.g. double delta)
+     *                      without containing lower ones (e.g. delta). 
+     *                      Derivative present in feature file that are of 
+     *                      higher order than is required are discarded.  
+     *                      Derivatives are computed in the final stage from 
+     *                      (extracted segment of) feature frames possibly 
+     *                      extended by repeated frames. Derivatives are 
+     *                      computed using the same formula that is employed 
+     *                      also by HTK tools. Lengths of windows used for 
+     *                      computation of derivatives are passed in parameter 
+     *                      derivWinLen. To compute derivatives for frames close 
+     *                      to boundaries, frames before the first and after the 
+     *                      last frame (of the extracted segment) are considered 
+     *                      to be (yet another) repetitions of the first and the 
+     *                      last frame, respectively. If the segment of frames 
+     *                      is extracted according to range specification and 
+     *                      parameters extLeft and extLeft are set to zero, the 
+     *                      first and the last frames of the segment are 
+     *                      considered to be repeated, eventough the true feature
+     *                      frames from beyond the segment boundary can be
+     *                      available in the file. Therefore, segment extracted 
+     *                      from features that were before augmented with 
+     *                      derivatives will differ 
+     *                      from the same segment augmented with derivatives by 
+     *                      this function. Difference will be of course only on 
+     *                      boundaries and only in derivatives. This "incorrect" 
+     *                      behavior was chosen to fully simulate behavior of 
+     *                      HTK tools. To obtain more correct computation of 
+     *                      derivatives, use parameters extLeft and extRight, 
+     *                      which correctly extend segment with the true frames 
+     *                      (if possible) and in resulting feature matrix ignore 
+     *                      first extLeft and last extRight frames. For this 
+     *                      purpose, both extLeft and extRight should be set to 
+     *                      sum of all values in the array derivWinLen.
+     * @param pDerivWinLen  Array of size derivOrder specifying lengths of 
+     *                      windows used for computation of derivatives. 
+     *                      Individual values represents one side context 
+     *                      used in the computation. The each window length is 
+     *                      therefore twice the value from array plus one. 
+     *                      Value at index zero specify window length for first 
+     *                      order derivatives (delta), higher indices 
+     *                      corresponds to higher order derivatives.
+     * @param pCmnPath      Cepstral mean normalization path
+     * @param pCmnMask      Cepstral mean normalization mask
+     * @param pCvnPath      Cepstral variance normalization path
+     * @param pCvnMask      Cepstral variance normalization mask
+     * @param pCvgFile      Global variance file to be parsed
+     *
+     * The given parameters are necessary for propper feature extraction 
+     */
+    void
+    Init(
+        bool                  swap,
+        int                   extLeft,
+        int                   extRight,
+        int                   targetKind,
+        int                   derivOrder,
+        int*                  pDerivWinLen,
+        const char*           pCmnPath,
+        const char*           pCmnMask,
+        const char*           pCvnPath,
+        const char*           pCvnMask,
+        const char*           pCvgFile);
+   
+    
+    void Trace(int trace)
+    { mTrace = trace; } 
+        
+    /** 
+     * @brief Returns a refference to the current file header
+     */
+    const HtkHeader&
+    CurrentHeader() const 
+    { return mHeader; }
+
+    /** 
+     * @brief Returns a refference to the current file header
+     */
+    const HtkHeaderExt&
+    CurrentHeaderExt() const 
+    { return mHeaderExt; }
+
+    /**
+     * @brief Returns the current file details
+     *
+     * @return Refference to a class @c FileListElem
+     *
+     * Logical and physical file names are stored in @c FileListElem class
+     */
+    const std::list<FileListElem>::iterator&
+    pCurrentRecord() const
+    { return mInputQueueIterator; }
+
+
+    /**
+     * @brief Returns the following file details
+     *
+     * @return Refference to a class @c FileListElem
+     *
+     * Logical and physical file names are stored in @c FileListElem class
+     */
+    const std::list<FileListElem>::iterator&
+    pFollowingRecord() const
+    { return mInputQueueIterator; }
+
+
+    void
+    Rewind()
+    { mInputQueueIterator = mInputQueue.begin(); }
+    
+    
+    /**
+     * @brief Adds a single feature file to the repository
+     * @param rFileName file to read features from
+     */
+    void
+    AddFile(const std::string & rFileName);
+    
+
+    /**
+     * @brief Adds a list of feature files to the repository
+     * @param rFileName feature list file to read from
+     */
+    void
+    AddFileList(const char* pFileName, const char* pFilter = "");
+  
+    
+    const FileListElem&
+    Current() const
+    { return *mInputQueueIterator; }
+
+    
+    /** 
+     * @brief Moves to the next record
+     */
+    void
+    MoveNext();
+    
+    /**
+     * @brief Reads full feature matrix from a feature file
+     * @param rMatrix matrix to be created and filled with read data
+     * @return number of successfully read feature vectors
+     */
+    bool
+    ReadFullMatrix(Matrix<BaseFloat>& rMatrix); 
+    
+    bool
+    WriteFeatureMatrix(const Matrix<BaseFloat>& rMatrix, const std::string& filename, int targetKind, int samplePeriod);
+    
+    size_t
+    QueueSize() const {return mInputQueue.size(); }
+
+    /**
+     * @brief Reads feature vectors from a feature file
+     * @param rMatrix matrix to be (only!) filled with read data. 
+     * @return number of successfully read feature vectors
+     * 
+     * The function tries to fill @c pMatrix with feature vectors comming from
+     * the current stream. If there are less vectors left in the stream, 
+     * they are used and true number of successfuly read vectors is returned.
+     */
+    int
+    ReadPartialMatrix(Matrix<BaseFloat>& rMatrix);    
+    
+    /** 
+     * @brief Filters the records of this repository based on HTK logical name
+     * masking. If pFilter equals to NULL, all source repository entries are
+     * coppied to rOut repository.
+     * 
+     * @param pFilter HTK mask that defines the filter
+     * @param pValue Filter value
+     * @param rOut Reference to the new FeatureRepository which will be filled
+     * with the matching records
+     */
+    void
+    HtkFilter(const char* pFilter, const char* pValue, FeatureRepository& rOut);
+
+
+    /** 
+     * @brief Filters the records of this repository based on HTK logical name
+     * masking and returns list of unique names. If pFilter equals to NULL, 
+     * single name "default" is returned.
+     * 
+     * @param pFilter HTK mask that defines the filter
+     * @param rOut Reference to the list of results (std::list< std::string >)
+     */
+    void
+    HtkSelection(const char* pFilter, std::list< std::string >& rOut);
+
+
+    /**
+     * @brief Returns true if there are no feature files left on input
+     */
+    bool
+    EndOfList() const 
+    { return mInputQueueIterator == mInputQueue.end(); }
+
+    const std::string&
+    CurrentIndexFileName() const
+    { return mCurrentIndexFileName; }
+    
+    friend
+    void
+    AddFileListToFeatureRepositories(
+      const char* pFileName,
+      const char* pFilter,
+      std::queue<FeatureRepository *> &featureRepositoryList);
+
+
+////////////////////////////////////////////////////////////////////////////////
+//  PRIVATE SECTION
+////////////////////////////////////////////////////////////////////////////////
+  private:
+    /// List (queue) of input feature files
+    std::list<FileListElem>             mInputQueue;
+    std::list<FileListElem>::iterator   mInputQueueIterator;
+    
+    std::string                         mCurrentIndexFileName;
+    std::string                         mCurrentIndexFileDir;
+    std::string                         mCurrentIndexFileExt;
+
+    /// current stream
+    IStkStream                  mStream;
+      
+    // stores feature file's HTK header
+    HtkHeader                   mHeader;
+    HtkHeaderExt                mHeaderExt;
+
+
+    // this group of variables serve for working withthe same physical
+    // file name more than once
+    char*                       mpLastFileName;
+    std::string                 mLastFileName;
+    char*                       mpLastCmnFile;
+    char*                       mpLastCvnFile;
+    char*                       mpLastCvgFile;
+    BaseFloat*                      mpCmn;
+    BaseFloat*                      mpCvn;
+    BaseFloat*                      mpCvg;
+    HtkHeader                   mLastHeader;
+    BaseFloat*                      mpA;
+    BaseFloat*                      mpB;
+
+
+
+    Timer mTim;
+    double mTimeOpen;
+    double mTimeSeek;
+    double mTimeRead;
+    double mTimeNormalize;
+
+
+    // Reads HTK feature file header
+    int 
+    ReadHTKHeader();
+
+    int 
+    ReadHTKFeature(BaseFloat*    pIn, 
+      size_t    feaLen, 
+      bool      decompress, 
+      BaseFloat*    pScale, 
+      BaseFloat*    pBias);
+
+    
+    bool 
+    ReadHTKFeatures(const std::string& rFileName, Matrix<BaseFloat>& rFeatureMatrix);
+    
+    bool 
+    ReadHTKFeatures(const FileListElem& rFileNameRecord, Matrix<BaseFloat>& rFeatureMatrix);
+
+
+    int 
+    WriteHTKHeader  (FILE* fp_out, HtkHeader header, bool swap);
+
+    int 
+    WriteHTKFeature (FILE* fp_out, FLOAT *out, size_t fea_len, bool swap, bool compress, FLOAT* pScale, FLOAT* pBias);
+
+    int 
+    WriteHTKFeatures(FILE* pOutFp, FLOAT * pOut, int nCoeffs, int nSamples, int samplePeriod, int targetKind, bool swap);
+
+    int 
+    WriteHTKFeatures(
+      FILE *  pOutFp,
+      int     samplePeriod,
+      int     targetKind,  
+      bool    swap,
+      Matrix<BaseFloat>& rFeatureMatrix
+    );
+
+    bool 
+    ReadGzipAsciiFeatures(const FileListElem& rFileNameRecord, Matrix<BaseFloat>& rFeatureMatrix);
+
+  }; // class FeatureStream
+
+} //namespace TNet
+
+#endif // TNet_Features_h