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#ifndef CORE_FMT_TRAITS_H
#define CORE_FMT_TRAITS_H
#include <array>
#include <cstddef>
#include <stdint.h>
#include "buffer_storage.h"
namespace al {
extern const std::array<int16_t,256> muLawDecompressionTable;
extern const std::array<int16_t,256> aLawDecompressionTable;
template<FmtType T>
struct FmtTypeTraits { };
template<>
struct FmtTypeTraits<FmtUByte> {
using Type = uint8_t;
template<typename OutT>
static constexpr OutT to(const Type val) noexcept { return val*OutT{1.0/128.0} - OutT{1.0}; }
};
template<>
struct FmtTypeTraits<FmtShort> {
using Type = int16_t;
template<typename OutT>
static constexpr OutT to(const Type val) noexcept { return val*OutT{1.0/32768.0}; }
};
template<>
struct FmtTypeTraits<FmtInt> {
using Type = int32_t;
template<typename OutT>
static constexpr OutT to(const Type val) noexcept
{ return static_cast<OutT>(val)*OutT{1.0/2147483648.0}; }
};
template<>
struct FmtTypeTraits<FmtFloat> {
using Type = float;
template<typename OutT>
static constexpr OutT to(const Type val) noexcept { return val; }
};
template<>
struct FmtTypeTraits<FmtDouble> {
using Type = double;
template<typename OutT>
static constexpr OutT to(const Type val) noexcept { return static_cast<OutT>(val); }
};
template<>
struct FmtTypeTraits<FmtMulaw> {
using Type = uint8_t;
template<typename OutT>
static constexpr OutT to(const Type val) noexcept
{ return muLawDecompressionTable[val] * OutT{1.0/32768.0}; }
};
template<>
struct FmtTypeTraits<FmtAlaw> {
using Type = uint8_t;
template<typename OutT>
static constexpr OutT to(const Type val) noexcept
{ return aLawDecompressionTable[val] * OutT{1.0/32768.0}; }
};
template<FmtType SrcType, typename DstT>
inline void LoadSampleArray(DstT *RESTRICT dst, const std::byte *src, const std::size_t srcstep,
const std::size_t samples) noexcept
{
using TypeTraits = FmtTypeTraits<SrcType>;
using SampleType = typename TypeTraits::Type;
const SampleType *RESTRICT ssrc{reinterpret_cast<const SampleType*>(src)};
for(size_t i{0u};i < samples;i++)
dst[i] = TypeTraits::template to<DstT>(ssrc[i*srcstep]);
}
} // namespace al
#endif /* CORE_FMT_TRAITS_H */
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