mirror of
https://github.com/portapack-mayhem/mayhem-firmware.git
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51 lines
1.6 KiB
C++
51 lines
1.6 KiB
C++
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/*
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* Copyright (C) 2015 Jared Boone, ShareBrained Technology, Inc.
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*
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* This file is part of PortaPack.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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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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*
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* You should have received a copy of the GNU General Public License
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* along with this program; see the file COPYING. If not, write to
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* the Free Software Foundation, Inc., 51 Franklin Street,
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* Boston, MA 02110-1301, USA.
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*/
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#include "dsp_iir.hpp"
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#include <hal.h>
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void IIRBiquadFilter::execute(buffer_s16_t buffer_in, buffer_s16_t buffer_out) {
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// TODO: Assert that buffer_out.count == buffer_in.count.
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for(size_t i=0; i<buffer_out.count; i++) {
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const int32_t output_sample = execute_sample(buffer_in.p[i]);
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const int32_t output_sample_saturated = __SSAT(output_sample, 16);
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buffer_out.p[i] = output_sample_saturated;
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}
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}
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void IIRBiquadFilter::execute_in_place(buffer_s16_t buffer) {
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execute(buffer, buffer);
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}
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float IIRBiquadFilter::execute_sample(const float in) {
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x[0] = x[1];
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x[1] = x[2];
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x[2] = in;
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y[0] = y[1];
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y[1] = y[2];
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y[2] = config.b[0] * x[2] + config.b[1] * x[1] + config.b[2] * x[0]
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- config.a[1] * y[1] - config.a[2] * y[0];
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return y[2];
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}
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