diff options
Diffstat (limited to 'Alc/hrtf.c')
| -rw-r--r-- | Alc/hrtf.c | 50 |
1 files changed, 31 insertions, 19 deletions
@@ -178,25 +178,37 @@ ALuint BuildBFormatHrtf(const struct Hrtf *Hrtf, ALfloat (*coeffs)[HRIR_LENGTH][ static const struct { ALfloat elevation; ALfloat azimuth; - } CubePoints[8] = { + } Ambi3DPoints[14] = { + { DEG2RAD( 90.0f), DEG2RAD( 0.0f) }, { DEG2RAD( 35.0f), DEG2RAD( -45.0f) }, { DEG2RAD( 35.0f), DEG2RAD( 45.0f) }, - { DEG2RAD( 35.0f), DEG2RAD(-135.0f) }, { DEG2RAD( 35.0f), DEG2RAD( 135.0f) }, + { DEG2RAD( 35.0f), DEG2RAD(-135.0f) }, + { DEG2RAD( 0.0f), DEG2RAD( 0.0f) }, + { DEG2RAD( 0.0f), DEG2RAD( 90.0f) }, + { DEG2RAD( 0.0f), DEG2RAD( 180.0f) }, + { DEG2RAD( 0.0f), DEG2RAD( -90.0f) }, { DEG2RAD(-35.0f), DEG2RAD( -45.0f) }, { DEG2RAD(-35.0f), DEG2RAD( 45.0f) }, - { DEG2RAD(-35.0f), DEG2RAD(-135.0f) }, { DEG2RAD(-35.0f), DEG2RAD( 135.0f) }, + { DEG2RAD(-35.0f), DEG2RAD(-135.0f) }, + { DEG2RAD(-90.0f), DEG2RAD( 0.0f) }, }; - static const ALfloat CubeMatrix[8][2][MAX_AMBI_COEFFS] = { - { { 0.25f, 0.1443375672f, 0.1443375672f, 0.1443375672f }, { 0.125f, 0.125f, 0.125f, 0.125f } }, - { { 0.25f, -0.1443375672f, 0.1443375672f, 0.1443375672f }, { 0.125f, -0.125f, 0.125f, 0.125f } }, - { { 0.25f, 0.1443375672f, 0.1443375672f, -0.1443375672f }, { 0.125f, 0.125f, 0.125f, -0.125f } }, - { { 0.25f, -0.1443375672f, 0.1443375672f, -0.1443375672f }, { 0.125f, -0.125f, 0.125f, -0.125f } }, - { { 0.25f, 0.1443375672f, -0.1443375672f, 0.1443375672f }, { 0.125f, 0.125f, -0.125f, 0.125f } }, - { { 0.25f, -0.1443375672f, -0.1443375672f, 0.1443375672f }, { 0.125f, -0.125f, -0.125f, 0.125f } }, - { { 0.25f, 0.1443375672f, -0.1443375672f, -0.1443375672f }, { 0.125f, 0.125f, -0.125f, -0.125f } }, - { { 0.25f, -0.1443375672f, -0.1443375672f, -0.1443375672f }, { 0.125f, -0.125f, -0.125f, -0.125f } }, + static const ALfloat Ambi3DMatrix[14][2][MAX_AMBI_COEFFS] = { + { { 0.18898176f, 0.000000000f, 0.188982460f, 0.000000000f }, { 0.0714283915f, 0.0000000000f, 0.1237180798f, 0.0000000000f } }, + { { 0.18898176f, 0.109109004f, 0.109109004f, 0.109109004f }, { 0.0714283915f, 0.0714286206f, 0.0714286206f, 0.0714286206f } }, + { { 0.18898176f, -0.109109004f, 0.109109004f, 0.109109004f }, { 0.0714283915f, -0.0714286206f, 0.0714286206f, 0.0714286206f } }, + { { 0.18898176f, -0.109109004f, 0.109109004f, -0.109109004f }, { 0.0714283915f, -0.0714286206f, 0.0714286206f, -0.0714286206f } }, + { { 0.18898176f, 0.109109004f, 0.109109004f, -0.109109004f }, { 0.0714283915f, 0.0714286206f, 0.0714286206f, -0.0714286206f } }, + { { 0.18898176f, 0.000000000f, 0.000000000f, 0.188982460f }, { 0.0714283915f, 0.0000000000f, 0.0000000000f, 0.1237180798f } }, + { { 0.18898176f, -0.188982460f, 0.000000000f, 0.000000000f }, { 0.0714283915f, -0.1237180798f, 0.0000000000f, 0.0000000000f } }, + { { 0.18898176f, 0.000000000f, 0.000000000f, -0.188982460f }, { 0.0714283915f, 0.0000000000f, 0.0000000000f, -0.1237180798f } }, + { { 0.18898176f, 0.188982460f, 0.000000000f, 0.000000000f }, { 0.0714283915f, 0.1237180798f, 0.0000000000f, 0.0000000000f } }, + { { 0.18898176f, 0.109109004f, -0.109109004f, 0.109109004f }, { 0.0714283915f, 0.0714286206f, -0.0714286206f, 0.0714286206f } }, + { { 0.18898176f, -0.109109004f, -0.109109004f, 0.109109004f }, { 0.0714283915f, -0.0714286206f, -0.0714286206f, 0.0714286206f } }, + { { 0.18898176f, -0.109109004f, -0.109109004f, -0.109109004f }, { 0.0714283915f, -0.0714286206f, -0.0714286206f, -0.0714286206f } }, + { { 0.18898176f, 0.109109004f, -0.109109004f, -0.109109004f }, { 0.0714283915f, 0.0714286206f, -0.0714286206f, -0.0714286206f } }, + { { 0.18898176f, 0.000000000f, -0.188982460f, 0.000000000f }, { 0.0714283915f, 0.0000000000f, -0.1237180798f, 0.0000000000f } }, }; /* Change this to 2 for dual-band HRTF processing. May require a higher quality * band-splitter, or better calculation of the new IR length to deal with the @@ -205,21 +217,21 @@ ALuint BuildBFormatHrtf(const struct Hrtf *Hrtf, ALfloat (*coeffs)[HRIR_LENGTH][ #define NUM_BANDS 1 BandSplitter splitter; ALfloat temps[3][HRIR_LENGTH]; - ALuint lidx[8], ridx[8]; + ALuint lidx[14], ridx[14]; ALuint min_delay = HRTF_HISTORY_LENGTH; ALuint max_length = 0; ALuint i, j, c, b; assert(NumChannels == 4); - for(c = 0;c < 8;c++) + for(c = 0;c < COUNTOF(Ambi3DPoints);c++) { ALuint evidx, azidx; ALuint evoffset; ALuint azcount; /* Calculate elevation index. */ - evidx = (ALuint)floorf((F_PI_2 + CubePoints[c].elevation) * + evidx = (ALuint)floorf((F_PI_2 + Ambi3DPoints[c].elevation) * (Hrtf->evCount-1)/F_PI + 0.5f); evidx = minu(evidx, Hrtf->evCount-1); @@ -227,7 +239,7 @@ ALuint BuildBFormatHrtf(const struct Hrtf *Hrtf, ALfloat (*coeffs)[HRIR_LENGTH][ evoffset = Hrtf->evOffset[evidx]; /* Calculate azimuth index for this elevation. */ - azidx = (ALuint)floorf((F_TAU+CubePoints[c].azimuth) * + azidx = (ALuint)floorf((F_TAU+Ambi3DPoints[c].azimuth) * azcount/F_TAU + 0.5f) % azcount; /* Calculate indices for left and right channels. */ @@ -239,7 +251,7 @@ ALuint BuildBFormatHrtf(const struct Hrtf *Hrtf, ALfloat (*coeffs)[HRIR_LENGTH][ memset(temps, 0, sizeof(temps)); bandsplit_init(&splitter, 400.0f / (ALfloat)Hrtf->sampleRate); - for(c = 0;c < 8;c++) + for(c = 0;c < COUNTOF(Ambi3DMatrix);c++) { const ALshort *fir; ALuint delay; @@ -268,7 +280,7 @@ ALuint BuildBFormatHrtf(const struct Hrtf *Hrtf, ALfloat (*coeffs)[HRIR_LENGTH][ { ALuint k = 0; for(j = delay;j < HRIR_LENGTH;++j) - coeffs[i][j][0] += temps[b][k++] * CubeMatrix[c][b][i]; + coeffs[i][j][0] += temps[b][k++] * Ambi3DMatrix[c][b][i]; } } max_length = maxu(max_length, minu(delay + Hrtf->irSize, HRIR_LENGTH)); @@ -297,7 +309,7 @@ ALuint BuildBFormatHrtf(const struct Hrtf *Hrtf, ALfloat (*coeffs)[HRIR_LENGTH][ { ALuint k = 0; for(j = delay;j < HRIR_LENGTH;++j) - coeffs[i][j][1] += temps[b][k++] * CubeMatrix[c][b][i]; + coeffs[i][j][1] += temps[b][k++] * Ambi3DMatrix[c][b][i]; } } max_length = maxu(max_length, minu(delay + Hrtf->irSize, HRIR_LENGTH)); |