portapack-mayhem/firmware/baseband/dsp_decimate.hpp
2016-01-03 23:09:06 -08:00

266 lines
5.2 KiB
C++

/*
* Copyright (C) 2014 Jared Boone, ShareBrained Technology, Inc.
*
* This file is part of PortaPack.
*
* 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, 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; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#ifndef __DSP_DECIMATE_H__
#define __DSP_DECIMATE_H__
#include <cstdint>
#include <array>
#include <memory>
#include <algorithm>
#include "utility.hpp"
#include "dsp_types.hpp"
#include "simd.hpp"
namespace dsp {
namespace decimate {
class Complex8DecimateBy2CIC3 {
public:
buffer_c16_t execute(
const buffer_c8_t& src,
const buffer_c16_t& dst
);
private:
uint32_t _i1_i0 { 0 };
uint32_t _q1_q0 { 0 };
};
class TranslateByFSOver4AndDecimateBy2CIC3 {
public:
buffer_c16_t execute(
const buffer_c8_t& src,
const buffer_c16_t& dst
);
private:
uint32_t _q1_i0 { 0 };
uint32_t _q0_i1 { 0 };
};
class DecimateBy2CIC3 {
public:
buffer_c16_t execute(
const buffer_c16_t& src,
const buffer_c16_t& dst
);
private:
uint32_t _iq0 { 0 };
uint32_t _iq1 { 0 };
};
class FIR64AndDecimateBy2Real {
public:
static constexpr size_t taps_count = 64;
void configure(
const std::array<int16_t, taps_count>& taps
);
buffer_s16_t execute(
const buffer_s16_t& src,
const buffer_s16_t& dst
);
private:
std::array<int16_t, taps_count + 2> z;
std::array<int16_t, taps_count> taps;
};
class FIRC8xR16x24FS4Decim4 {
public:
static constexpr size_t taps_count = 24;
static constexpr size_t decimation_factor = 4;
using sample_t = complex8_t;
using tap_t = int16_t;
enum class Shift : bool {
Down = true,
Up = false
};
FIRC8xR16x24FS4Decim4();
void configure(
const std::array<tap_t, taps_count>& taps,
const int32_t scale,
const Shift shift = Shift::Down
);
buffer_c16_t execute(
const buffer_c8_t& src,
const buffer_c16_t& dst
);
private:
std::array<vec2_s16, taps_count - decimation_factor> z_;
std::array<tap_t, taps_count> taps_;
int32_t output_scale = 0;
};
class FIRC8xR16x24FS4Decim8 {
public:
static constexpr size_t taps_count = 24;
static constexpr size_t decimation_factor = 8;
using sample_t = complex8_t;
using tap_t = int16_t;
enum class Shift : bool {
Down = true,
Up = false
};
FIRC8xR16x24FS4Decim8();
void configure(
const std::array<tap_t, taps_count>& taps,
const int32_t scale,
const Shift shift = Shift::Down
);
buffer_c16_t execute(
const buffer_c8_t& src,
const buffer_c16_t& dst
);
private:
std::array<vec2_s16, taps_count - decimation_factor> z_;
std::array<tap_t, taps_count> taps_;
int32_t output_scale = 0;
};
class FIRC16xR16x16Decim2 {
public:
static constexpr size_t taps_count = 16;
static constexpr size_t decimation_factor = 2;
using sample_t = complex16_t;
using tap_t = int16_t;
FIRC16xR16x16Decim2();
void configure(
const std::array<tap_t, taps_count>& taps,
const int32_t scale
);
buffer_c16_t execute(
const buffer_c16_t& src,
const buffer_c16_t& dst
);
private:
std::array<vec2_s16, taps_count - decimation_factor> z_;
std::array<tap_t, taps_count> taps_;
int32_t output_scale = 0;
};
class FIRC16xR16x32Decim8 {
public:
static constexpr size_t taps_count = 32;
static constexpr size_t decimation_factor = 8;
using sample_t = complex16_t;
using tap_t = int16_t;
FIRC16xR16x32Decim8();
void configure(
const std::array<tap_t, taps_count>& taps,
const int32_t scale
);
buffer_c16_t execute(
const buffer_c16_t& src,
const buffer_c16_t& dst
);
private:
std::array<vec2_s16, taps_count - decimation_factor> z_;
std::array<tap_t, taps_count> taps_;
int32_t output_scale = 0;
};
class FIRAndDecimateComplex {
public:
using sample_t = complex16_t;
using tap_t = complex16_t;
using taps_t = tap_t[];
/* NOTE! Current code makes an assumption that block of samples to be
* processed will be a multiple of the taps_count.
*/
FIRAndDecimateComplex(
) : taps_count_ { 0 },
decimation_factor_ { 1 }
{
}
template<typename T>
void configure(
const T& taps,
const size_t decimation_factor
) {
samples_ = std::make_unique<samples_t>(taps.size());
taps_reversed_ = std::make_unique<taps_t>(taps.size());
taps_count_ = taps.size();
decimation_factor_ = decimation_factor;
std::reverse_copy(taps.cbegin(), taps.cend(), &taps_reversed_[0]);
}
buffer_c16_t execute(
const buffer_c16_t& src,
const buffer_c16_t& dst
);
private:
using samples_t = sample_t[];
std::unique_ptr<samples_t> samples_;
std::unique_ptr<taps_t> taps_reversed_;
size_t taps_count_;
size_t decimation_factor_;
};
class DecimateBy2CIC4Real {
public:
buffer_s16_t execute(
const buffer_s16_t& src,
const buffer_s16_t& dst
);
private:
int16_t z[5];
};
} /* namespace decimate */
} /* namespace dsp */
#endif/*__DSP_DECIMATE_H__*/