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98 lines
3.3 KiB
C++
98 lines
3.3 KiB
C++
/* resample.h
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This file is part of a program that implements a Software-Defined Radio.
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Copyright (C) 2013 Warren Pratt, NR0V
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Copyright (C) 2024 Edouard Griffiths, F4EXB Adapted to SDRangel
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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The author can be reached by email at
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warren@wpratt.com
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*/
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/************************************************************************************************
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* *
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* VERSION FOR COMPLEX DOUBLE-PRECISION *
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* *
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************************************************************************************************/
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#ifndef wdsp_resample_h
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#define wdsp_resample_h
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#include "export.h"
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namespace WDSP {
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class WDSP_API RESAMPLE
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{
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public:
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int run; // run
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int size; // number of input samples per buffer
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float* in; // input buffer for resampler
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float* out; // output buffer for resampler
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int in_rate;
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int out_rate;
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double fcin;
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double fc;
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double fc_low;
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double gain;
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int idx_in; // index for input into ring
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int ncoefin;
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int ncoef; // number of coefficients
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int L; // interpolation factor
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int M; // decimation factor
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double* h; // coefficients
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int ringsize; // number of complex pairs the ring buffer holds
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double* ring; // ring buffer
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int cpp; // coefficients of the phase
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int phnum; // phase number
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static RESAMPLE* create_resample (
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int run,
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int size,
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float* in,
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float* out,
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int in_rate,
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int out_rate,
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double fc,
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int ncoef,
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double gain
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);
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static void destroy_resample (RESAMPLE *a);
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static void flush_resample (RESAMPLE *a);
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static int xresample (RESAMPLE *a);
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static void setBuffers_resample (RESAMPLE *a, float* in, float* out);
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static void setSize_resample(RESAMPLE *a, int size);
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static void setInRate_resample(RESAMPLE *a, int rate);
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static void setOutRate_resample(RESAMPLE *a, int rate);
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static void setFCLow_resample (RESAMPLE *a, double fc_low);
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static void setBandwidth_resample (RESAMPLE *a, double fc_low, double fc_high);
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// Exported calls
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static void* create_resampleV (int in_rate, int out_rate);
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static void xresampleV (float* input, float* output, int numsamps, int* outsamps, void* ptr);
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static void destroy_resampleV (void* ptr);
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private:
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static void calc_resample (RESAMPLE *a);
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static void decalc_resample (RESAMPLE *a);
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};
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} // namespace WDSP
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#endif
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