audio_sample_unpacker.hpp

// Copyright Take Vos 2021.
// Distributed under the Boost Software License, Version 1.0.
// (See accompanying file LICENSE_1_0.txt or copy at https://www.boost.org/LICENSE_1_0.txt)
 
#pragma once
 
#include "audio_sample_format.hpp"
#include "../required.hpp"
#include "../architecture.hpp"
#include "../rapid/numeric_array.hpp"
#include <cstddef>
#include <bit>
 
namespace hi::inline v1 {
 
class audio_sample_unpacker {
public:
    audio_sample_unpacker(audio_sample_format format, std::size_t stride) noexcept;
 
    void operator()(std::byte const *hi_restrict src, float *hi_restrict dst, std::size_t num_samples) const noexcept;
 
private:
    f32x4 _multiplier;
    i8x16 _load_shuffle_indices;
    i8x16 _concat_shuffle_indices;
    std::size_t _num_chunks_per_quad;
    std::size_t _stride;
    std::size_t _chunk_stride;
    audio_sample_format _format;
    int _direction;
    int _start_byte;
    int _align_shift;
 
    [[nodiscard]] std::size_t calculate_num_fast_samples(std::size_t num_samples) const noexcept;
};
 
} // namespace hi::inline v1