/* firmin.h This file is part of a program that implements a Software-Defined Radio. Copyright (C) 2016 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 */ /******************************************************************************************************** * * * Time-Domain FIR * * * ********************************************************************************************************/ #ifndef _firmin_h #define _firmin_h typedef struct _firmin { int run; // run control int position; // position at which to execute int size; // input/output buffer size, power of two double* in; // input buffer double* out; // output buffer, can be same as input int nc; // number of filter coefficients, power of two double f_low; // low cutoff frequency double f_high; // high cutoff frequency double* ring; // internal complex ring buffer double* h; // complex filter coefficients int rsize; // ring size, number of complex samples, power of two int mask; // mask to update indexes int idx; // ring input/output index double samplerate; // sample rate int wintype; // filter window type double gain; // filter gain }firmin, *FIRMIN; extern FIRMIN create_firmin (int run, int position, int size, double* in, double* out, int nc, double f_low, double f_high, int samplerate, int wintype, double gain); extern void destroy_firmin (FIRMIN a); extern void flush_firmin (FIRMIN a); extern void xfirmin (FIRMIN a, int pos); extern void setBuffers_firmin (FIRMIN a, double* in, double* out); extern void setSamplerate_firmin (FIRMIN a, int rate); extern void setSize_firmin (FIRMIN a, int size); extern void setFreqs_firmin (FIRMIN a, double f_low, double f_high); #endif /******************************************************************************************************** * * * Standalone Partitioned Overlap-Save Bandpass * * * ********************************************************************************************************/ #ifndef _firopt_h #define _firopt_h typedef struct _firopt { int run; // run control int position; // position at which to execute int size; // input/output buffer size, power of two double* in; // input buffer double* out; // output buffer, can be same as input int nc; // number of filter coefficients, power of two, >= size double f_low; // low cutoff frequency double f_high; // high cutoff frequency double samplerate; // sample rate int wintype; // filter window type double gain; // filter gain int nfor; // number of buffers in delay line double* fftin; // fft input buffer double** fmask; // frequency domain masks double** fftout; // fftout delay line double* accum; // frequency domain accumulator int buffidx; // fft out buffer index int idxmask; // mask for index computations double* maskgen; // input for mask generation FFT fftw_plan* pcfor; // array of forward FFT plans fftw_plan crev; // reverse fft plan fftw_plan* maskplan; // plans for frequency domain masks } firopt, *FIROPT; extern FIROPT create_firopt (int run, int position, int size, double* in, double* out, int nc, double f_low, double f_high, int samplerate, int wintype, double gain); extern void xfiropt (FIROPT a, int pos); extern void destroy_firopt (FIROPT a); extern void flush_firopt (FIROPT a); extern void setBuffers_firopt (FIROPT a, double* in, double* out); extern void setSamplerate_firopt (FIROPT a, int rate); extern void setSize_firopt (FIROPT a, int size); extern void setFreqs_firopt (FIROPT a, double f_low, double f_high); #endif /******************************************************************************************************** * * * Partitioned Overlap-Save Filter Kernel * * * ********************************************************************************************************/ #ifndef _fircore_h #define _fircore_h typedef struct _fircore { int size; // input/output buffer size, power of two double* in; // input buffer double* out; // output buffer, can be same as input int nc; // number of filter coefficients, power of two, >= size double* impulse; // impulse response of filter double* imp; int nfor; // number of buffers in delay line double* fftin; // fft input buffer double*** fmask; // frequency domain masks double** fftout; // fftout delay line double* accum; // frequency domain accumulator int buffidx; // fft out buffer index int idxmask; // mask for index computations double* maskgen; // input for mask generation FFT fftw_plan* pcfor; // array of forward FFT plans fftw_plan crev; // reverse fft plan fftw_plan** maskplan; // plans for frequency domain masks CRITICAL_SECTION update; int cset; int mp; int masks_ready; } fircore, *FIRCORE; extern FIRCORE create_fircore (int size, double* in, double* out, int nc, int mp, double* impulse); extern void xfircore (FIRCORE a); extern void destroy_fircore (FIRCORE a); extern void flush_fircore (FIRCORE a); extern void setBuffers_fircore (FIRCORE a, double* in, double* out); extern void setSize_fircore (FIRCORE a, int size); extern void setImpulse_fircore (FIRCORE a, double* impulse, int update); extern void setNc_fircore (FIRCORE a, int nc, double* impulse); extern void setMp_fircore (FIRCORE a, int mp); extern void setUpdate_fircore (FIRCORE a); #endif