1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
|
#include "config.h"
#include "ambidefs.h"
#include <cassert>
namespace {
constexpr std::array<float,MaxAmbiOrder+1> Ambi3DDecoderHFScale10{{
1.000000000e+00f, 5.773502692e-01f
}};
constexpr std::array<float,MaxAmbiOrder+1> Ambi3DDecoderHFScale2O{{
9.128709292e-01f, 7.071067812e-01f, 3.651483717e-01f
}};
constexpr std::array<float,MaxAmbiOrder+1> Ambi3DDecoderHFScale3O{{
8.340921354e-01f, 7.182670250e-01f, 5.107426573e-01f, 2.541870634e-01f
}};
/*constexpr std::array<float,MaxAmbiOrder+1> Ambi3DDecoderHFScale4O{{
1.727324867e-02f, 3.238734126e-02f, 8.245277297e-02f, 2.360733547e-01f, 7.127761153e-01f
}};*/
inline auto& GetDecoderHFScales(uint order) noexcept
{
if(order >= 3) return Ambi3DDecoderHFScale3O;
if(order == 2) return Ambi3DDecoderHFScale2O;
return Ambi3DDecoderHFScale10;
}
} // namespace
auto AmbiScale::GetHFOrderScales(const uint in_order, const uint out_order) noexcept
-> std::array<float,MaxAmbiOrder+1>
{
std::array<float,MaxAmbiOrder+1> ret{};
assert(out_order >= in_order);
const auto &target = GetDecoderHFScales(out_order);
const auto &input = GetDecoderHFScales(in_order);
for(size_t i{0};i < in_order+1;++i)
ret[i] = input[i] / target[i];
return ret;
}
|
