mirror of https://github.com/axmolengine/axmol.git
82 lines
2.0 KiB
C
82 lines
2.0 KiB
C
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#ifndef CORE_FMT_TRAITS_H
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#define CORE_FMT_TRAITS_H
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#include <stddef.h>
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#include <stdint.h>
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#include "albyte.h"
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#include "buffer_storage.h"
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namespace al {
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extern const int16_t muLawDecompressionTable[256];
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extern const int16_t aLawDecompressionTable[256];
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template<FmtType T>
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struct FmtTypeTraits { };
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template<>
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struct FmtTypeTraits<FmtUByte> {
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using Type = uint8_t;
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template<typename OutT>
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static constexpr inline OutT to(const Type val) noexcept
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{ return val*OutT{1.0/128.0} - OutT{1.0}; }
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};
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template<>
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struct FmtTypeTraits<FmtShort> {
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using Type = int16_t;
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template<typename OutT>
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static constexpr inline OutT to(const Type val) noexcept { return val*OutT{1.0/32768.0}; }
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};
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template<>
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struct FmtTypeTraits<FmtFloat> {
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using Type = float;
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template<typename OutT>
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static constexpr inline OutT to(const Type val) noexcept { return val; }
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};
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template<>
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struct FmtTypeTraits<FmtDouble> {
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using Type = double;
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template<typename OutT>
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static constexpr inline OutT to(const Type val) noexcept { return static_cast<OutT>(val); }
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};
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template<>
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struct FmtTypeTraits<FmtMulaw> {
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using Type = uint8_t;
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template<typename OutT>
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static constexpr inline OutT to(const Type val) noexcept
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{ return muLawDecompressionTable[val] * OutT{1.0/32768.0}; }
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};
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template<>
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struct FmtTypeTraits<FmtAlaw> {
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using Type = uint8_t;
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template<typename OutT>
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static constexpr inline OutT to(const Type val) noexcept
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{ return aLawDecompressionTable[val] * OutT{1.0/32768.0}; }
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};
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template<FmtType SrcType, typename DstT>
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inline void LoadSampleArray(DstT *RESTRICT dst, const al::byte *src, const size_t srcstep,
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const size_t samples) noexcept
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{
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using TypeTraits = FmtTypeTraits<SrcType>;
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using SampleType = typename TypeTraits::Type;
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const SampleType *RESTRICT ssrc{reinterpret_cast<const SampleType*>(src)};
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for(size_t i{0u};i < samples;i++)
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dst[i] = TypeTraits::template to<DstT>(ssrc[i*srcstep]);
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}
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} // namespace al
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#endif /* CORE_FMT_TRAITS_H */
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