diff options
Diffstat (limited to 'Alc/bformatdec.c')
| -rw-r--r-- | Alc/bformatdec.c | 58 |
1 files changed, 30 insertions, 28 deletions
diff --git a/Alc/bformatdec.c b/Alc/bformatdec.c index 29207338..056eb7f5 100644 --- a/Alc/bformatdec.c +++ b/Alc/bformatdec.c @@ -122,21 +122,23 @@ enum FreqBand { FB_Max }; -static const ALfloat SquarePoints[4][3] = { +/* These points are in AL coordinates! */ +static const ALfloat Ambi2DPoints[4][3] = { { -0.707106781f, 0.0f, -0.707106781f }, { 0.707106781f, 0.0f, -0.707106781f }, { -0.707106781f, 0.0f, 0.707106781f }, { 0.707106781f, 0.0f, 0.707106781f }, }; -static const ALfloat SquareMatrix[4][FB_Max][MAX_AMBI_COEFFS] = { +static const ALfloat Ambi2DDecoder[4][FB_Max][MAX_AMBI_COEFFS] = { { { 0.353553f, 0.204094f, 0.0f, 0.204094f }, { 0.25f, 0.204094f, 0.0f, 0.204094f } }, { { 0.353553f, -0.204094f, 0.0f, 0.204094f }, { 0.25f, -0.204094f, 0.0f, 0.204094f } }, { { 0.353553f, 0.204094f, 0.0f, -0.204094f }, { 0.25f, 0.204094f, 0.0f, -0.204094f } }, { { 0.353553f, -0.204094f, 0.0f, -0.204094f }, { 0.25f, -0.204094f, 0.0f, -0.204094f } }, }; -static ALfloat SquareEncoder[4][MAX_AMBI_COEFFS]; +static ALfloat Ambi2DEncoder[4][MAX_AMBI_COEFFS]; -static const ALfloat CubePoints[8][3] = { +/* These points are in AL coordinates! */ +static const ALfloat Ambi3DPoints[8][3] = { { -0.577350269f, 0.577350269f, -0.577350269f }, { 0.577350269f, 0.577350269f, -0.577350269f }, { -0.577350269f, 0.577350269f, 0.577350269f }, @@ -146,7 +148,7 @@ static const ALfloat CubePoints[8][3] = { { -0.577350269f, -0.577350269f, 0.577350269f }, { 0.577350269f, -0.577350269f, 0.577350269f }, }; -static const ALfloat CubeMatrix[8][FB_Max][MAX_AMBI_COEFFS] = { +static const ALfloat Ambi3DDecoder[8][FB_Max][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 } }, @@ -156,7 +158,7 @@ static const ALfloat CubeMatrix[8][FB_Max][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 } }, }; -static ALfloat CubeEncoder[8][MAX_AMBI_COEFFS]; +static ALfloat Ambi3DEncoder[8][MAX_AMBI_COEFFS]; static inline RowMixerFunc SelectMixer(void) @@ -183,21 +185,21 @@ static void init_bformatdec(void) MixMatrixRow = SelectMixer(); - for(i = 0;i < COUNTOF(CubePoints);i++) - CalcDirectionCoeffs(CubePoints[i], 0.0f, CubeEncoder[i]); + for(i = 0;i < COUNTOF(Ambi3DPoints);i++) + CalcDirectionCoeffs(Ambi3DPoints[i], 0.0f, Ambi3DEncoder[i]); - for(i = 0;i < COUNTOF(SquarePoints);i++) - CalcDirectionCoeffs(SquarePoints[i], 0.0f, SquareEncoder[i]); - for(i = 0;i < COUNTOF(SquarePoints);i++) + for(i = 0;i < COUNTOF(Ambi2DPoints);i++) { + CalcDirectionCoeffs(Ambi2DPoints[i], 0.0f, Ambi2DEncoder[i]); + /* Remove the skipped height-related coefficients for 2D rendering. */ - SquareEncoder[i][2] = SquareEncoder[i][3]; - SquareEncoder[i][3] = SquareEncoder[i][4]; - SquareEncoder[i][4] = SquareEncoder[i][8]; - SquareEncoder[i][5] = SquareEncoder[i][9]; - SquareEncoder[i][6] = SquareEncoder[i][15]; + Ambi2DEncoder[i][2] = Ambi2DEncoder[i][3]; + Ambi2DEncoder[i][3] = Ambi2DEncoder[i][4]; + Ambi2DEncoder[i][4] = Ambi2DEncoder[i][8]; + Ambi2DEncoder[i][5] = Ambi2DEncoder[i][9]; + Ambi2DEncoder[i][6] = Ambi2DEncoder[i][15]; for(j = 7;j < MAX_AMBI_COEFFS;j++) - SquareEncoder[i][j] = 0.0f; + Ambi2DEncoder[i][j] = 0.0f; } } @@ -319,10 +321,10 @@ void bformatdec_reset(BFormatDec *dec, const AmbDecConf *conf, ALuint chancount, for(j = 0;j < dec->NumChannels;j++) { ALfloat *gains = dec->UpSampler.Gains[i][j]; - for(k = 0;k < COUNTOF(CubeMatrix);k++) + for(k = 0;k < COUNTOF(Ambi3DDecoder);k++) { - gains[FB_HighFreq] += CubeMatrix[k][FB_HighFreq][i]*CubeEncoder[k][j]; - gains[FB_LowFreq] += CubeMatrix[k][FB_LowFreq][i]*CubeEncoder[k][j]; + gains[FB_HighFreq] += Ambi3DDecoder[k][FB_HighFreq][i]*Ambi3DEncoder[k][j]; + gains[FB_LowFreq] += Ambi3DDecoder[k][FB_LowFreq][i]*Ambi3DEncoder[k][j]; } } } @@ -336,10 +338,10 @@ void bformatdec_reset(BFormatDec *dec, const AmbDecConf *conf, ALuint chancount, for(j = 0;j < dec->NumChannels;j++) { ALfloat *gains = dec->UpSampler.Gains[i][j]; - for(k = 0;k < COUNTOF(SquareMatrix);k++) + for(k = 0;k < COUNTOF(Ambi2DDecoder);k++) { - gains[FB_HighFreq] += SquareMatrix[k][FB_HighFreq][i]*SquareEncoder[k][j]; - gains[FB_LowFreq] += SquareMatrix[k][FB_LowFreq][i]*SquareEncoder[k][j]; + gains[FB_HighFreq] += Ambi2DDecoder[k][FB_HighFreq][i]*Ambi2DEncoder[k][j]; + gains[FB_LowFreq] += Ambi2DDecoder[k][FB_LowFreq][i]*Ambi2DEncoder[k][j]; } } } @@ -640,18 +642,18 @@ void ambiup_reset(struct AmbiUpsampler *ambiup, const ALCdevice *device) for(i = 0;i < 4;i++) bandsplit_init(&ambiup->XOver[i], ratio); - for(i = 0;i < COUNTOF(CubePoints);i++) - ComputePanningGains(device->Dry, CubeEncoder[i], 1.0f, gains[i]); + for(i = 0;i < COUNTOF(Ambi3DEncoder);i++) + ComputePanningGains(device->Dry, Ambi3DEncoder[i], 1.0f, gains[i]); memset(ambiup->Gains, 0, sizeof(ambiup->Gains)); for(i = 0;i < 4;i++) { for(j = 0;j < device->Dry.NumChannels;j++) { - for(k = 0;k < COUNTOF(CubePoints);k++) + for(k = 0;k < COUNTOF(Ambi3DDecoder);k++) { - ambiup->Gains[i][j][FB_HighFreq] += CubeMatrix[k][FB_HighFreq][i]*gains[k][j]; - ambiup->Gains[i][j][FB_LowFreq] += CubeMatrix[k][FB_LowFreq][i]*gains[k][j]; + ambiup->Gains[i][j][FB_HighFreq] += Ambi3DDecoder[k][FB_HighFreq][i]*gains[k][j]; + ambiup->Gains[i][j][FB_LowFreq] += Ambi3DDecoder[k][FB_LowFreq][i]*gains[k][j]; } } } |