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Diffstat (limited to 'alc/ambidefs.h')
| -rw-r--r-- | alc/ambidefs.h | 135 |
1 files changed, 0 insertions, 135 deletions
diff --git a/alc/ambidefs.h b/alc/ambidefs.h deleted file mode 100644 index 339b51f9..00000000 --- a/alc/ambidefs.h +++ /dev/null @@ -1,135 +0,0 @@ -#ifndef AMBIDEFS_H -#define AMBIDEFS_H - -#include <array> -#include <stddef.h> -#include <stdint.h> - -using uint = unsigned int; - -/* The maximum number of Ambisonics channels. For a given order (o), the size - * needed will be (o+1)**2, thus zero-order has 1, first-order has 4, second- - * order has 9, third-order has 16, and fourth-order has 25. - */ -constexpr uint8_t MaxAmbiOrder{3}; -constexpr inline size_t AmbiChannelsFromOrder(size_t order) noexcept -{ return (order+1) * (order+1); } -constexpr size_t MaxAmbiChannels{AmbiChannelsFromOrder(MaxAmbiOrder)}; - -/* A bitmask of ambisonic channels for 0 to 4th order. This only specifies up - * to 4th order, which is the highest order a 32-bit mask value can specify (a - * 64-bit mask could handle up to 7th order). - */ -constexpr uint Ambi0OrderMask{0x00000001}; -constexpr uint Ambi1OrderMask{0x0000000f}; -constexpr uint Ambi2OrderMask{0x000001ff}; -constexpr uint Ambi3OrderMask{0x0000ffff}; -constexpr uint Ambi4OrderMask{0x01ffffff}; - -/* A bitmask of ambisonic channels with height information. If none of these - * channels are used/needed, there's no height (e.g. with most surround sound - * speaker setups). This is ACN ordering, with bit 0 being ACN 0, etc. - */ -constexpr uint AmbiPeriphonicMask{0xfe7ce4}; - -/* The maximum number of ambisonic channels for 2D (non-periphonic) - * representation. This is 2 per each order above zero-order, plus 1 for zero- - * order. Or simply, o*2 + 1. - */ -constexpr inline size_t Ambi2DChannelsFromOrder(size_t order) noexcept -{ return order*2 + 1; } -constexpr size_t MaxAmbi2DChannels{Ambi2DChannelsFromOrder(MaxAmbiOrder)}; - - -/* NOTE: These are scale factors as applied to Ambisonics content. Decoder - * coefficients should be divided by these values to get proper scalings. - */ -struct AmbiScale { - static constexpr std::array<float,MaxAmbiChannels> FromN3D{{ - 1.0f, 1.0f, 1.0f, 1.0f, 1.0f, 1.0f, 1.0f, 1.0f, - 1.0f, 1.0f, 1.0f, 1.0f, 1.0f, 1.0f, 1.0f, 1.0f - }}; - static constexpr std::array<float,MaxAmbiChannels> FromSN3D{{ - 1.000000000f, /* ACN 0, sqrt(1) */ - 1.732050808f, /* ACN 1, sqrt(3) */ - 1.732050808f, /* ACN 2, sqrt(3) */ - 1.732050808f, /* ACN 3, sqrt(3) */ - 2.236067978f, /* ACN 4, sqrt(5) */ - 2.236067978f, /* ACN 5, sqrt(5) */ - 2.236067978f, /* ACN 6, sqrt(5) */ - 2.236067978f, /* ACN 7, sqrt(5) */ - 2.236067978f, /* ACN 8, sqrt(5) */ - 2.645751311f, /* ACN 9, sqrt(7) */ - 2.645751311f, /* ACN 10, sqrt(7) */ - 2.645751311f, /* ACN 11, sqrt(7) */ - 2.645751311f, /* ACN 12, sqrt(7) */ - 2.645751311f, /* ACN 13, sqrt(7) */ - 2.645751311f, /* ACN 14, sqrt(7) */ - 2.645751311f, /* ACN 15, sqrt(7) */ - }}; - static constexpr std::array<float,MaxAmbiChannels> FromFuMa{{ - 1.414213562f, /* ACN 0 (W), sqrt(2) */ - 1.732050808f, /* ACN 1 (Y), sqrt(3) */ - 1.732050808f, /* ACN 2 (Z), sqrt(3) */ - 1.732050808f, /* ACN 3 (X), sqrt(3) */ - 1.936491673f, /* ACN 4 (V), sqrt(15)/2 */ - 1.936491673f, /* ACN 5 (T), sqrt(15)/2 */ - 2.236067978f, /* ACN 6 (R), sqrt(5) */ - 1.936491673f, /* ACN 7 (S), sqrt(15)/2 */ - 1.936491673f, /* ACN 8 (U), sqrt(15)/2 */ - 2.091650066f, /* ACN 9 (Q), sqrt(35/8) */ - 1.972026594f, /* ACN 10 (O), sqrt(35)/3 */ - 2.231093404f, /* ACN 11 (M), sqrt(224/45) */ - 2.645751311f, /* ACN 12 (K), sqrt(7) */ - 2.231093404f, /* ACN 13 (L), sqrt(224/45) */ - 1.972026594f, /* ACN 14 (N), sqrt(35)/3 */ - 2.091650066f, /* ACN 15 (P), sqrt(35/8) */ - }}; -}; - -struct AmbiIndex { - static constexpr std::array<uint8_t,MaxAmbiChannels> FromFuMa{{ - 0, /* W */ - 3, /* X */ - 1, /* Y */ - 2, /* Z */ - 6, /* R */ - 7, /* S */ - 5, /* T */ - 8, /* U */ - 4, /* V */ - 12, /* K */ - 13, /* L */ - 11, /* M */ - 14, /* N */ - 10, /* O */ - 15, /* P */ - 9, /* Q */ - }}; - static constexpr std::array<uint8_t,MaxAmbi2DChannels> FromFuMa2D{{ - 0, /* W */ - 3, /* X */ - 1, /* Y */ - 8, /* U */ - 4, /* V */ - 15, /* P */ - 9, /* Q */ - }}; - - static constexpr std::array<uint8_t,MaxAmbiChannels> FromACN{{ - 0, 1, 2, 3, 4, 5, 6, 7, - 8, 9, 10, 11, 12, 13, 14, 15 - }}; - static constexpr std::array<uint8_t,MaxAmbi2DChannels> From2D{{ - 0, 1,3, 4,8, 9,15 - }}; - - static constexpr std::array<uint8_t,MaxAmbiChannels> OrderFromChannel{{ - 0, 1,1,1, 2,2,2,2,2, 3,3,3,3,3,3,3, - }}; - static constexpr std::array<uint8_t,MaxAmbi2DChannels> OrderFrom2DChannel{{ - 0, 1,1, 2,2, 3,3, - }}; -}; - -#endif /* AMBIDEFS_H */ |