mirror of
https://github.com/portapack-mayhem/mayhem-firmware.git
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606c1cebac
Padding struct to be sizeof() % 4 == 0, because it was crashing the baseband... I think.
265 lines
5.4 KiB
C++
265 lines
5.4 KiB
C++
/*
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* Copyright (C) 2014 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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#ifndef __DSP_DECIMATE_H__
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#define __DSP_DECIMATE_H__
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#include <cstdint>
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#include <array>
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#include <memory>
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#include <algorithm>
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#include "utility.hpp"
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#include "dsp_types.hpp"
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#include "simd.hpp"
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namespace dsp {
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namespace decimate {
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class Complex8DecimateBy2CIC3 {
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public:
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buffer_c16_t execute(
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const buffer_c8_t& src,
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const buffer_c16_t& dst
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);
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private:
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uint32_t _i1_i0 { 0 };
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uint32_t _q1_q0 { 0 };
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};
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class TranslateByFSOver4AndDecimateBy2CIC3 {
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public:
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buffer_c16_t execute(
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const buffer_c8_t& src,
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const buffer_c16_t& dst
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);
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private:
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uint32_t _q1_i0 { 0 };
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uint32_t _q0_i1 { 0 };
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};
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class DecimateBy2CIC3 {
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public:
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buffer_c16_t execute(
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const buffer_c16_t& src,
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const buffer_c16_t& dst
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);
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private:
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uint32_t _iq0 { 0 };
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uint32_t _iq1 { 0 };
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};
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class FIR64AndDecimateBy2Real {
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public:
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static constexpr size_t taps_count = 64;
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void configure(
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const std::array<int16_t, taps_count>& taps
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);
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buffer_s16_t execute(
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const buffer_s16_t& src,
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const buffer_s16_t& dst
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);
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private:
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std::array<int16_t, taps_count + 2> z { };
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std::array<int16_t, taps_count> taps { };
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};
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class FIRC8xR16x24FS4Decim4 {
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public:
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static constexpr size_t taps_count = 24;
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static constexpr size_t decimation_factor = 4;
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using sample_t = complex8_t;
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using tap_t = int16_t;
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enum class Shift : bool {
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Down = true,
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Up = false
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};
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void configure(
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const std::array<tap_t, taps_count>& taps,
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const int32_t scale,
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const Shift shift = Shift::Down
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);
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buffer_c16_t execute(
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const buffer_c8_t& src,
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const buffer_c16_t& dst
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);
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private:
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std::array<vec2_s16, taps_count - decimation_factor> z_ { };
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std::array<tap_t, taps_count> taps_ { };
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int32_t output_scale = 0;
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};
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class FIRC8xR16x24FS4Decim8 {
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public:
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static constexpr size_t taps_count = 24;
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static constexpr size_t decimation_factor = 8;
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using sample_t = complex8_t;
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using tap_t = int16_t;
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enum class Shift : bool {
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Down = true,
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Up = false
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};
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void configure(
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const std::array<tap_t, taps_count>& taps,
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const int32_t scale,
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const Shift shift = Shift::Down
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);
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buffer_c16_t execute(
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const buffer_c8_t& src,
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const buffer_c16_t& dst
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);
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private:
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std::array<vec2_s16, taps_count - decimation_factor> z_ { };
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std::array<tap_t, taps_count> taps_ { };
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int32_t output_scale = 0;
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};
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class FIRC16xR16x16Decim2 {
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public:
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static constexpr size_t taps_count = 16;
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static constexpr size_t decimation_factor = 2;
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using sample_t = complex16_t;
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using tap_t = int16_t;
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void configure(
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const std::array<tap_t, taps_count>& taps,
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const int32_t scale
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);
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buffer_c16_t execute(
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const buffer_c16_t& src,
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const buffer_c16_t& dst
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);
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private:
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std::array<vec2_s16, taps_count - decimation_factor> z_ { };
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std::array<tap_t, taps_count> taps_ { };
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int32_t output_scale = 0;
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};
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class FIRC16xR16x32Decim8 {
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public:
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static constexpr size_t taps_count = 32;
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static constexpr size_t decimation_factor = 8;
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using sample_t = complex16_t;
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using tap_t = int16_t;
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void configure(
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const std::array<tap_t, taps_count>& taps,
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const int32_t scale
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);
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buffer_c16_t execute(
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const buffer_c16_t& src,
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const buffer_c16_t& dst
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);
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private:
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std::array<vec2_s16, taps_count - decimation_factor> z_ { };
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std::array<tap_t, taps_count> taps_ { };
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int32_t output_scale = 0;
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};
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class FIRAndDecimateComplex {
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public:
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using sample_t = complex16_t;
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using tap_t = complex16_t;
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using taps_t = tap_t[];
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/* NOTE! Current code makes an assumption that block of samples to be
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* processed will be a multiple of the taps_count.
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*/
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template<typename T>
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void configure(
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const T& taps,
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const size_t decimation_factor
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) {
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configure(taps.data(), taps.size(), decimation_factor);
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}
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buffer_c16_t execute(
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const buffer_c16_t& src,
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const buffer_c16_t& dst
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);
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private:
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using samples_t = sample_t[];
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std::unique_ptr<samples_t> samples_ { };
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std::unique_ptr<taps_t> taps_reversed_ { };
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size_t taps_count_ { 0 };
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size_t decimation_factor_ { 1 };
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template<typename T>
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void configure(
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const T* const taps,
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const size_t taps_count,
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const size_t decimation_factor
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) {
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configure_common(taps_count, decimation_factor);
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std::reverse_copy(&taps[0], &taps[taps_count], &taps_reversed_[0]);
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}
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void configure_common(
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const size_t taps_count,
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const size_t decimation_factor
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);
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};
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class DecimateBy2CIC4Real {
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public:
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buffer_s16_t execute(
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const buffer_s16_t& src,
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const buffer_s16_t& dst
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);
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private:
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int16_t z[5] { };
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int16_t _dummy { }; // TODO: Addresses GCC bug when constructing a class that's not sizeof() % 4 == 0?
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};
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} /* namespace decimate */
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} /* namespace dsp */
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#endif/*__DSP_DECIMATE_H__*/
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