convert.hpp

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#pragma once
#include <type_traits>
#include <dsp/common.hpp>
 
 
namespace rack {
namespace dsp {
 

struct
#ifdef __clang__
__attribute__((packed, aligned(1)))
#else
__attribute__((packed, aligned(1), gcc_struct))
#endif
Int24 {
    int32_t i : 24;
    Int24() {}
    Int24(int32_t i) : i(i) {}
    operator int32_t() {return i;}
};
static_assert(sizeof(Int24) == 3, "Int24 type must be 3 bytes");
 

template <typename To, typename From>
To convert(From x) = delete;
 

template <>
inline float convert(float x) {return x;}
 

template <>
inline float convert(int8_t x) {return x / 128.f;}
template <>
inline float convert(int16_t x) {return x / 32768.f;}
template <>
inline float convert(Int24 x) {return x / 8388608.f;}
template <>
inline float convert(int32_t x) {return x / 2147483648.f;}
template <>
inline float convert(int64_t x) {return x / 9223372036854775808.f;}
 

template <>
inline int8_t convert(float x) {return std::min(std::llround(x * 128.f), 127LL);}
template <>
inline int16_t convert(float x) {return std::min(std::llround(x * 32768.f), 32767LL);}
template <>
inline Int24 convert(float x) {return std::min(std::llround(x * 8388608.f), 8388607LL);}
template <>
inline int32_t convert(float x) {return std::min(std::llround(x * 2147483648.f), 2147483647LL);}
template <>
inline int64_t convert(float x) {return std::min(std::llround(x * 9223372036854775808.f), 9223372036854775807LL);}
 

template <typename To, typename From>
void convert(const From* in, To* out, size_t len) {
    for (size_t i = 0; i < len; i++) {
        out[i] = convert<To, From>(in[i]);
    }
}
 
 
} // namespace dsp
} // namespace rack