rotator.h

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/* -*- c++ -*- */
/*
 * Copyright 2003,2008,2013 Free Software Foundation, Inc.
 *
 * This file is part of GNU Radio
 *
 * SPDX-License-Identifier: GPL-3.0-or-later
 *
 */
 
#ifndef _GR_ROTATOR_H_
#define _GR_ROTATOR_H_
 
#include <gnuradio/blocks/api.h>
#include <gnuradio/gr_complex.h>
#include <volk/volk.h>
#include <cmath>
 
namespace gr {
namespace blocks {
 
class rotator
{
private:
    gr_complex d_phase;
    gr_complex d_phase_incr;
    unsigned int d_counter;
 
public:
    rotator() : d_phase(1), d_phase_incr(1), d_counter(0) {}
 
    gr_complex phase() { return d_phase; }
    void set_phase(gr_complex phase) { d_phase = phase / std::abs(phase); }
    void set_phase_incr(gr_complex incr) { d_phase_incr = incr / std::abs(incr); }
 
    gr_complex rotate(gr_complex in)
    {
        d_counter++;
 
        gr_complex z = in * d_phase; // rotate in by phase
        d_phase *= d_phase_incr;     // incr our phase (complex mult == add phases)
 
        if ((d_counter % 512) == 0)
            d_phase /=
                std::abs(d_phase); // Normalize to ensure multiplication is rotation
 
        return z;
    }
 
    void rotateN(gr_complex* out, const gr_complex* in, int n)
    {
        volk_32fc_s32fc_x2_rotator_32fc(out, in, d_phase_incr, &d_phase, n);
    }
};
 
} /* namespace blocks */
} /* namespace gr */
 
#endif /* _GR_ROTATOR_H_ */