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start to use code from the original resample codebase, since it uses fixed point math instead of float; however, the code is not at all complete right now, I just commit this to get it off my HD (neither the old nor the new code in resample.cpp work anyway)

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svn-id: r10089
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Max Horn 2003-09-08 15:32:37 +00:00
parent 63cd3051f3
commit ef373fe2e8
2 changed files with 689 additions and 488 deletions
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1118
sound/resample.cpp
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59
sound/resample.h
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@ -24,15 +24,64 @@
#include "sound/rate.h"
typedef struct {
byte priv[1024];
} eff_struct;
typedef eff_struct *eff_t;
/* this Float MUST match that in filter.c */
#define Float double/*float*/
// From resample's stddef.h
typedef int16 HWORD;
typedef uint16 UHWORD;
typedef int32 WORD;
typedef uint32 UWORD;
#define MAX_HWORD (32767)
#define MIN_HWORD (-32768)
#define MAXNWING 8192
/* Private data for Lerp via LCM file */
typedef struct resamplestuff {
double Factor; /* Factor = Fout/Fin sample rates */
int quadr; /* non-zero to use qprodUD quadratic interpolation */
long Nq;
long dhb;
long a, b; /* gcd-reduced input,output rates */
long t; /* Current time/pos for exact-coeff's method */
long Xh; /* number of past/future samples needed by filter */
long Xoff; /* Xh plus some room for creep */
long Xread; /* X[Xread] is start-position to enter new samples */
long Xp; /* X[Xp] is position to start filter application */
long Xsize, Ysize; /* size (Floats) of X[],Y[] */
long Yposition; /* FIXME: offset into Y buffer */
Float *X, *Y; /* I/O buffers */
} *resample_t;
/** High quality rate conversion algorithm, based on SoX (http://sox.sourceforge.net). */
class ResampleRateConverter : public RateConverter {
protected:
eff_struct effp;
resamplestuff rstuff;
int quadr; /* non-zero to use qprodUD quadratic interpolation */
UHWORD LpScl; /* Unity-gain scale factor */
UHWORD Nwing; /* Filter table size */
UHWORD Nmult; /* Filter length for up-conversions */
HWORD Imp[MAXNWING]; /* Filter coefficients */
HWORD ImpD[MAXNWING]; /* ImpD[n] = Imp[n+1]-Imp[n] */
HWORD *X1, *Y1;
HWORD *X2, *Y2;
UWORD Time; /* Current time/pos in input sample */
public:
ResampleRateConverter(st_rate_t inrate, st_rate_t outrate, int quality);
~ResampleRateConverter();