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Uladzimir Karpenka
2026-06-01 15:58:45 +03:00
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resample.h
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/* resample.h
This file is part of a program that implements a Software-Defined Radio.
Copyright (C) 2013 Warren Pratt, NR0V
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
The author can be reached by email at
warren@wpratt.com
*/
/************************************************************************************************
* *
* VERSION FOR COMPLEX DOUBLE-PRECISION *
* *
************************************************************************************************/
#ifndef _resample_h
#define _resample_h
typedef struct _resample
{
int run; // run
int size; // number of input samples per buffer
double* in; // input buffer for resampler
double* out; // output buffer for resampler
int in_rate;
int out_rate;
double fcin;
double fc;
double fc_low;
double gain;
int idx_in; // index for input into ring
int ncoefin;
int ncoef; // number of coefficients
int L; // interpolation factor
int M; // decimation factor
double* h; // coefficients
int ringsize; // number of complex pairs the ring buffer holds
double* ring; // ring buffer
int cpp; // coefficients of the phase
int phnum; // phase number
} resample, *RESAMPLE;
__declspec (dllexport)
RESAMPLE create_resample (int run, int size, double* in, double* out, int in_rate, int out_rate, double fc, int ncoef, double gain);
__declspec (dllexport)
void destroy_resample (RESAMPLE a);
__declspec (dllexport)
void flush_resample (RESAMPLE a);
__declspec (dllexport)
int xresample (RESAMPLE a);
extern void setBuffers_resample (RESAMPLE a, double* in, double* out);
extern void setSize_resample(RESAMPLE a, int size);
extern void setInRate_resample(RESAMPLE a, int rate);
extern void setOutRate_resample(RESAMPLE a, int rate);
extern void setFCLow_resample (RESAMPLE a, double fc_low);
extern void setBandwidth_resample (RESAMPLE a, double fc_low, double fc_high);
#endif
/************************************************************************************************
* *
* VERSION FOR NON-COMPLEX FLOATS *
* *
************************************************************************************************/
#ifndef _resampleF_h
#define _resampleF_h
typedef struct _resampleF
{
int run; // run
int size; // number of input samples per buffer
float* in; // input buffer for resampler
float* out; // output buffer for resampler
int idx_in; // index for input into ring
int ncoef; // number of coefficients
int L; // interpolation factor
int M; // decimation factor
double* h; // coefficients
int ringsize; // number of values the ring buffer holds
double* ring; // ring buffer
int cpp; // coefficients of the phase
int phnum; // phase number
} resampleF, *RESAMPLEF;
extern RESAMPLEF create_resampleF (int run, int size, float* in, float* out, int in_rate, int out_rate);
extern void destroy_resampleF (RESAMPLEF a);
extern void flush_resampleF (RESAMPLEF a);
extern int xresampleF (RESAMPLEF a);
#endif