mirror of
https://github.com/eried/portapack-mayhem.git
synced 2024-09-20 16:15:51 +00:00
91 lines
2.1 KiB
C++
91 lines
2.1 KiB
C++
/*
|
|
* Copyright (C) 2015 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 __BLOCK_DECIMATOR_H__
|
|
#define __BLOCK_DECIMATOR_H__
|
|
|
|
#include <cstdint>
|
|
#include <cstddef>
|
|
|
|
#include "complex.hpp"
|
|
|
|
template<size_t N>
|
|
class BlockDecimator {
|
|
public:
|
|
constexpr BlockDecimator(
|
|
const size_t factor
|
|
) : factor { factor }
|
|
{
|
|
}
|
|
|
|
void set_input_sampling_rate(const uint32_t new_sampling_rate) {
|
|
if( new_sampling_rate != input_sampling_rate ) {
|
|
input_sampling_rate = new_sampling_rate;
|
|
reset_state();
|
|
}
|
|
}
|
|
|
|
void set_factor(const size_t new_factor) {
|
|
if( new_factor != factor ) {
|
|
factor = new_factor;
|
|
reset_state();
|
|
}
|
|
}
|
|
|
|
uint32_t output_sampling_rate() const {
|
|
return input_sampling_rate / factor;
|
|
}
|
|
|
|
template<typename BlockCallback>
|
|
void feed(const buffer_c16_t src, BlockCallback callback) {
|
|
/* NOTE: Input block size must be >= factor */
|
|
|
|
set_input_sampling_rate(src.sampling_rate);
|
|
|
|
while( src_i < src.count ) {
|
|
buffer[dst_i++] = src.p[src_i];
|
|
if( dst_i == buffer.size() ) {
|
|
callback({ buffer.data(), buffer.size(), output_sampling_rate() });
|
|
reset_state();
|
|
dst_i = 0;
|
|
}
|
|
|
|
src_i += factor;
|
|
}
|
|
|
|
src_i -= src.count;
|
|
}
|
|
|
|
private:
|
|
std::array<complex16_t, N> buffer;
|
|
uint32_t input_sampling_rate { 0 };
|
|
size_t factor { 1 };
|
|
size_t src_i { 0 };
|
|
size_t dst_i { 0 };
|
|
|
|
void reset_state() {
|
|
src_i = 0;
|
|
dst_i = 0;
|
|
}
|
|
};
|
|
|
|
#endif/*__BLOCK_DECIMATOR_H__*/
|