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aflibConverter.h

Go to the documentation of this file.

/*
 * Copyright: (C) 2000 Julius O. Smith
 *
 *   This library is free software; you can redistribute it and/or
 *   modify it under the terms of the GNU Lesser General Public
 *   License as published by the Free Software Foundation; either
 *   version 2.1 of the License, or any later version.
 *
 *   This library is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *   Lesser General Public License for more details.
 *
 *   You should have received a copy of the GNU Lesser General Public
 *   License along with this library; if not, write to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307  USA
 *
 *   Julius O. Smith  jos@ccrma.stanford.edu
 *
 */
/* This code was modified by Bruce Forsberg (forsberg@tns.net) to make it
   into a C++ class
*/


#ifndef _AFLIBCONVERTER_H_
#define _AFLIBCONVERTER_H_

#ifndef MAX
#define MAX(x,y) ((x)>(y) ?(x):(y))
#endif
#ifndef MIN
#define MIN(x,y) ((x)<(y) ?(x):(y))
#endif

#define MAX_HWORD (32767)
#define MIN_HWORD (-32768)

#define IBUFFSIZE 4096                         /* Input buffer size */

class aflibConverter {

public:

   // Available contructors and destructors
   aflibConverter (
      bool  high_quality,
      bool  linear_interpolation,
      bool  filter_interpolation);

   ~aflibConverter();

   void
   initialize(
      double factor,   /* factor = Sndout/Sndin */
      int    channels, /* number of sound channels */
      double volume = 1.0); /* factor to multiply amplitude */

   int
   resample(           /* number of output samples returned */
      int& inCount,    /* number of input samples to convert */
      int outCount,    /* number of output samples to compute */
      short inArray[], /* input array data (length inCount * nChans) */
      short outArray[]);/* output array data (length outCount * nChans) */
 
 
private:

   aflibConverter();

   aflibConverter(const aflibConverter& op);

   const aflibConverter&
   operator=(const aflibConverter& op);

   int
   err_ret(char *s);

   void
   deleteMemory();

   int
   readData(
      int   inCount,       /* _total_ number of frames in input file */
      short inArray[],     /* input data */
      short *outPtr[],     /* array receiving chan samps */
      int   dataArraySize, /* size of these arrays */
      int   Xoff,          /* read into input array starting at this index */
      bool  init_count);


   inline short
   WordToHword(int v, int scl)
   {
       short out;
       int llsb = (1<<(scl-1));
       v += llsb;          /* round */
       v >>= scl;
       if (v>MAX_HWORD) {
#ifdef DEBUG
           if (pof == 0)
             fprintf(stderr, "*** resample: sound sample overflow\n");
           else if ((pof % 10000) == 0)
             fprintf(stderr, "*** resample: another ten thousand overflows\n");
           pof++;
#endif
           v = MAX_HWORD;
       } else if (v < MIN_HWORD) {
#ifdef DEBUG
           if (nof == 0)
             fprintf(stderr, "*** resample: sound sample (-) overflow\n");
           else if ((nof % 1000) == 0)
             fprintf(stderr, "*** resample: another thousand (-) overflows\n");
           nof++;
#endif
           v = MIN_HWORD;
       }
       out = (short) v;
       return out;
   };

   int
   SrcLinear(
      short X[],
      short Y[],
      double factor,
      unsigned int *Time,
      unsigned short& Nx,
      unsigned short Nout);

   int
   SrcUp(
      short X[],
      short Y[],
      double factor,
      unsigned int *Time,
      unsigned short& Nx,
      unsigned short Nout,
      unsigned short Nwing,
      unsigned short LpScl,
      short Imp[],
      short ImpD[],
      bool Interp);

   int
   SrcUD(
      short X[],
      short Y[],
      double factor,
      unsigned int *Time,
      unsigned short& Nx,
      unsigned short Nout,
      unsigned short Nwing,
      unsigned short LpScl,
      short Imp[],
      short ImpD[],
      bool Interp);

   int
   FilterUp(
      short Imp[],
      short ImpD[],
      unsigned short Nwing,
      bool Interp,
      short *Xp,
      short Ph,
      short Inc);

   int
   FilterUD(
      short Imp[],
      short ImpD[],
      unsigned short Nwing,
      bool Interp,
      short *Xp,
      short Ph,
      short Inc,
      unsigned short dhb);

   int
   resampleFast(  /* number of output samples returned */
      int& inCount,     /* number of input samples to convert */
      int outCount,    /* number of output samples to compute */
      short inArray[], /* input array data (length inCount * nChans) */
      short outArray[]);/* output array data (length outCount * nChans) */
 
   int
   resampleWithFilter(  /* number of output samples returned */
      int& inCount,      /* number of input samples to convert */
      int outCount,     /* number of output samples to compute */
      short inArray[],  /* input array data (length inCount * nChans) */
      short outArray[], /* output array data (length outCount * nChans) */
      short Imp[], short ImpD[],
      unsigned short LpScl, unsigned short Nmult, unsigned short Nwing);


static short SMALL_FILTER_IMP[];
static short LARGE_FILTER_IMP[];

bool    interpFilt;
bool    largeFilter;
bool    linearInterp;
short  ** X;
short  ** Y;
unsigned int Time;
double  factor;
int     nChans;
bool    initial;
double  vol;

};


#endif

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