2022-07-04 17:03:07 -04:00
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// Copyright 2020 modemm17 LLC.
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2022-06-06 21:22:18 -04:00
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#pragma once
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#include <array>
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#include <cstdint>
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#include <cstddef>
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#include <tuple>
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2022-07-04 17:03:07 -04:00
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namespace modemm17
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2022-06-06 21:22:18 -04:00
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{
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template <size_t N = 368>
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struct M17Framer
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{
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using buffer_t = std::array<int8_t, N>;
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alignas(16) buffer_t buffer_;
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size_t index_ = 0;
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M17Framer()
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{
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reset();
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}
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static constexpr size_t size() { return N; }
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size_t operator()(int dibit, int8_t** result)
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{
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buffer_[index_++] = (dibit >> 1) ? 1 : -1;
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buffer_[index_++] = (dibit & 1) ? 1 : -1;
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if (index_ == N)
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{
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index_ = 0;
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*result = buffer_.data();
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return N;
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}
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return 0;
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}
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// LLR mode
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size_t operator()(std::tuple<int8_t, int8_t> symbol, int8_t** result)
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{
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buffer_[index_++] = std::get<0>(symbol);
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buffer_[index_++] = std::get<1>(symbol);
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if (index_ == N)
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{
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index_ = 0;
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*result = buffer_.data();
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return N;
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}
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return 0;
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}
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2022-07-04 17:03:07 -04:00
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2022-06-06 21:22:18 -04:00
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void reset()
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{
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buffer_.fill(0);
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index_ = 0;
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}
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};
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2022-07-04 17:03:07 -04:00
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} // modemm17
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