wave_rom.hpp

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#pragma once
 
#include "tabulasonora/rom_image.hpp"
 
#include <cstdint>
#include <optional>
#include <vector>
 
namespace ts {

struct WaveStreams {
    std::vector<std::uint8_t> delta;
    std::vector<std::uint8_t> preamble_delta;
    std::vector<std::uint8_t> scale;
    std::int32_t sample_count = 0;
    std::int32_t data_start = 0;
    std::int32_t scale_phase = 0;
};

class WaveRom {
public:
    static constexpr std::int32_t region_size = 0x100000;

    static constexpr std::int32_t max_sample_count = 2'000'000;

    static constexpr int bank_a_region_count = 16;

    static constexpr int bank_b_region_count = 8;

    [[nodiscard]] static constexpr int region_count(int bank) noexcept
    {
        return bank == 0 ? bank_a_region_count : bank_b_region_count;
    }

    struct SplitRegion {
        int bank = 0;
        int effective_region = 0;
    };
 
    [[nodiscard]] static constexpr SplitRegion split_region(int region) noexcept
    {
        const int bank = (region >> 4) & 1;
        return SplitRegion{bank, region - (16 * bank)};
    }

    explicit WaveRom(const RomImage& rom);

    [[nodiscard]] std::int64_t bank_base(int bank) const noexcept
    {
        return bank == 0 ? bank_a_base_ : bank_b_base_;
    }

    [[nodiscard]] std::int64_t region_base(int region) const noexcept;

    [[nodiscard]] std::optional<WaveStreams> read_streams(int region, int loop, int start) const;
 
private:
    const RomImage* rom_;
    std::int64_t bank_a_base_ = 0;
    std::int64_t bank_b_base_ = 0;
};
 
} // namespace ts