diff options
| author | Chris Robinson <[email protected]> | 2018-12-15 23:28:49 -0800 |
|---|---|---|
| committer | Chris Robinson <[email protected]> | 2018-12-15 23:28:49 -0800 |
| commit | 741861eaa62bd555255f19467fa115a12b7fd577 (patch) | |
| tree | 355ace44252d63c55760ad1747bff8a24b089cf2 /Alc/ambidefs.h | |
| parent | a6a5634adb1bdec44fa7cb8557e5b6d59642d7aa (diff) | |
Put the ACN index map in a header
Also put it and the Ambisonic scales in a more appropriate header.
Diffstat (limited to 'Alc/ambidefs.h')
| -rw-r--r-- | Alc/ambidefs.h | 72 |
1 files changed, 72 insertions, 0 deletions
diff --git a/Alc/ambidefs.h b/Alc/ambidefs.h index 124a0c8e..bdeac18e 100644 --- a/Alc/ambidefs.h +++ b/Alc/ambidefs.h @@ -30,4 +30,76 @@ */ #define MAX_AMBI2D_COEFFS (MAX_AMBI_ORDER*2 + 1) + +/* NOTE: These are scale factors as applied to Ambisonics content. Decoder + * coefficients should be divided by these values to get proper N3D scalings. + */ +struct AmbiScale { + static constexpr float N3D2N3D[MAX_AMBI_COEFFS]{ + 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 float SN3D2N3D[MAX_AMBI_COEFFS]{ + 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 float FuMa2N3D[MAX_AMBI_COEFFS]{ + 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 int FuMa2ACN[MAX_AMBI_COEFFS]{ + 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 int ACN2ACN[MAX_AMBI_COEFFS]{ + 0, 1, 2, 3, 4, 5, 6, 7, + 8, 9, 10, 11, 12, 13, 14, 15 + }; +}; + #endif /* AMBIDEFS_H */ |