ALvoid aluInitPanning(ALCdevice *Device)
{
ALfloat SpeakerAngle[MAXCHANNELS];
enum Channel *Speaker2Chan;
ALfloat Alpha, Theta;
ALint pos;
ALuint s;
Speaker2Chan = Device->Speaker2Chan;
switch(Device->FmtChans)
{
case DevFmtMono:
Device->NumChan = 1;
Speaker2Chan[0] = FRONT_CENTER;
SpeakerAngle[0] = F_PI/180.0f * 0.0f;
break;
case DevFmtStereo:
Device->NumChan = 2;
Speaker2Chan[0] = FRONT_LEFT;
Speaker2Chan[1] = FRONT_RIGHT;
SpeakerAngle[0] = F_PI/180.0f * -90.0f;
SpeakerAngle[1] = F_PI/180.0f * 90.0f;
SetSpeakerArrangement("layout_STEREO", SpeakerAngle, Speaker2Chan, Device->NumChan);
break;
case DevFmtQuad:
Device->NumChan = 4;
Speaker2Chan[0] = BACK_LEFT;
Speaker2Chan[1] = FRONT_LEFT;
Speaker2Chan[2] = FRONT_RIGHT;
Speaker2Chan[3] = BACK_RIGHT;
SpeakerAngle[0] = F_PI/180.0f * -135.0f;
SpeakerAngle[1] = F_PI/180.0f * -45.0f;
SpeakerAngle[2] = F_PI/180.0f * 45.0f;
SpeakerAngle[3] = F_PI/180.0f * 135.0f;
SetSpeakerArrangement("layout_QUAD", SpeakerAngle, Speaker2Chan, Device->NumChan);
break;
case DevFmtX51:
Device->NumChan = 5;
Speaker2Chan[0] = BACK_LEFT;
Speaker2Chan[1] = FRONT_LEFT;
Speaker2Chan[2] = FRONT_CENTER;
Speaker2Chan[3] = FRONT_RIGHT;
Speaker2Chan[4] = BACK_RIGHT;
SpeakerAngle[0] = F_PI/180.0f * -110.0f;
SpeakerAngle[1] = F_PI/180.0f * -30.0f;
SpeakerAngle[2] = F_PI/180.0f * 0.0f;
SpeakerAngle[3] = F_PI/180.0f * 30.0f;
SpeakerAngle[4] = F_PI/180.0f * 110.0f;
SetSpeakerArrangement("layout_51CHN", SpeakerAngle, Speaker2Chan, Device->NumChan);
break;
case DevFmtX51Side:
Device->NumChan = 5;
Speaker2Chan[0] = SIDE_LEFT;
Speaker2Chan[1] = FRONT_LEFT;
Speaker2Chan[2] = FRONT_CENTER;
Speaker2Chan[3] = FRONT_RIGHT;
Speaker2Chan[4] = SIDE_RIGHT;
SpeakerAngle[0] = F_PI/180.0f * -90.0f;
SpeakerAngle[1] = F_PI/180.0f * -30.0f;
SpeakerAngle[2] = F_PI/180.0f * 0.0f;
SpeakerAngle[3] = F_PI/180.0f * 30.0f;
SpeakerAngle[4] = F_PI/180.0f * 90.0f;
SetSpeakerArrangement("layout_51SIDECHN", SpeakerAngle, Speaker2Chan, Device->NumChan);
break;
case DevFmtX61:
Device->NumChan = 6;
Speaker2Chan[0] = SIDE_LEFT;
Speaker2Chan[1] = FRONT_LEFT;
Speaker2Chan[2] = FRONT_CENTER;
Speaker2Chan[3] = FRONT_RIGHT;
Speaker2Chan[4] = SIDE_RIGHT;
Speaker2Chan[5] = BACK_CENTER;
SpeakerAngle[0] = F_PI/180.0f * -90.0f;
SpeakerAngle[1] = F_PI/180.0f * -30.0f;
SpeakerAngle[2] = F_PI/180.0f * 0.0f;
SpeakerAngle[3] = F_PI/180.0f * 30.0f;
SpeakerAngle[4] = F_PI/180.0f * 90.0f;
SpeakerAngle[5] = F_PI/180.0f * 180.0f;
SetSpeakerArrangement("layout_61CHN", SpeakerAngle, Speaker2Chan, Device->NumChan);
break;
case DevFmtX71:
Device->NumChan = 7;
Speaker2Chan[0] = BACK_LEFT;
Speaker2Chan[1] = SIDE_LEFT;
Speaker2Chan[2] = FRONT_LEFT;
Speaker2Chan[3] = FRONT_CENTER;
Speaker2Chan[4] = FRONT_RIGHT;
Speaker2Chan[5] = SIDE_RIGHT;
Speaker2Chan[6] = BACK_RIGHT;
SpeakerAngle[0] = F_PI/180.0f * -150.0f;
SpeakerAngle[1] = F_PI/180.0f * -90.0f;
SpeakerAngle[2] = F_PI/180.0f * -30.0f;
SpeakerAngle[3] = F_PI/180.0f * 0.0f;
SpeakerAngle[4] = F_PI/180.0f * 30.0f;
SpeakerAngle[5] = F_PI/180.0f * 90.0f;
SpeakerAngle[6] = F_PI/180.0f * 150.0f;
SetSpeakerArrangement("layout_71CHN", SpeakerAngle, Speaker2Chan, Device->NumChan);
break;
}
for(pos = 0; pos < LUT_NUM; pos++)
{
ALfloat *PanningLUT = Device->PanningLUT[pos];
/* clear all values */
for(s = 0; s < MAXCHANNELS; s++)
PanningLUT[s] = 0.0f;
if(Device->NumChan == 1)
{
PanningLUT[Speaker2Chan[0]] = 1.0f;
continue;
}
/* source angle */
Theta = aluLUTpos2Angle(pos);
/* set panning values */
for(s = 0; s < Device->NumChan - 1; s++)
{
if(Theta >= SpeakerAngle[s] && Theta < SpeakerAngle[s+1])
{
/* source between speaker s and speaker s+1 */
Alpha = (Theta-SpeakerAngle[s]) /
(SpeakerAngle[s+1]-SpeakerAngle[s]);
PanningLUT[Speaker2Chan[s]] = aluSqrt(1.0f-Alpha);
PanningLUT[Speaker2Chan[s+1]] = aluSqrt( Alpha);
break;
}
}
if(s == Device->NumChan - 1)
{
/* source between last and first speaker */
if(Theta < SpeakerAngle[0])
Theta += F_PI*2.0f;
Alpha = (Theta-SpeakerAngle[s]) /
(F_PI*2.0f + SpeakerAngle[0]-SpeakerAngle[s]);
PanningLUT[Speaker2Chan[s]] = aluSqrt(1.0f-Alpha);
PanningLUT[Speaker2Chan[0]] = aluSqrt( Alpha);
}
}
}
ALvoid aluInitPanning(ALCdevice *Device)
{
ALfloat SpeakerAngle[MAXCHANNELS];
ALfloat (*Matrix)[MAXCHANNELS];
Channel *Speaker2Chan;
ALfloat Alpha, Theta;
ALfloat *PanningLUT;
ALint pos, offset;
ALuint s, s2;
for(s = 0;s < MAXCHANNELS;s++)
{
for(s2 = 0;s2 < MAXCHANNELS;s2++)
Device->ChannelMatrix[s][s2] = ((s==s2) ? 1.0f : 0.0f);
}
Speaker2Chan = Device->Speaker2Chan;
Matrix = Device->ChannelMatrix;
switch(Device->FmtChans)
{
case DevFmtMono:
Matrix[FRONT_LEFT][FRONT_CENTER] = aluSqrt(0.5);
Matrix[FRONT_RIGHT][FRONT_CENTER] = aluSqrt(0.5);
Matrix[SIDE_LEFT][FRONT_CENTER] = aluSqrt(0.5);
Matrix[SIDE_RIGHT][FRONT_CENTER] = aluSqrt(0.5);
Matrix[BACK_LEFT][FRONT_CENTER] = aluSqrt(0.5);
Matrix[BACK_RIGHT][FRONT_CENTER] = aluSqrt(0.5);
Matrix[BACK_CENTER][FRONT_CENTER] = 1.0f;
Device->NumChan = 1;
Speaker2Chan[0] = FRONT_CENTER;
SpeakerAngle[0] = 0.0f * M_PI/180.0f;
break;
case DevFmtStereo:
Matrix[FRONT_CENTER][FRONT_LEFT] = aluSqrt(0.5);
Matrix[FRONT_CENTER][FRONT_RIGHT] = aluSqrt(0.5);
Matrix[SIDE_LEFT][FRONT_LEFT] = 1.0f;
Matrix[SIDE_RIGHT][FRONT_RIGHT] = 1.0f;
Matrix[BACK_LEFT][FRONT_LEFT] = 1.0f;
Matrix[BACK_RIGHT][FRONT_RIGHT] = 1.0f;
Matrix[BACK_CENTER][FRONT_LEFT] = aluSqrt(0.5);
Matrix[BACK_CENTER][FRONT_RIGHT] = aluSqrt(0.5);
Device->NumChan = 2;
Speaker2Chan[0] = FRONT_LEFT;
Speaker2Chan[1] = FRONT_RIGHT;
SpeakerAngle[0] = -90.0f * M_PI/180.0f;
SpeakerAngle[1] = 90.0f * M_PI/180.0f;
SetSpeakerArrangement("layout_STEREO", SpeakerAngle, Speaker2Chan, Device->NumChan);
break;
case DevFmtQuad:
Matrix[FRONT_CENTER][FRONT_LEFT] = aluSqrt(0.5);
Matrix[FRONT_CENTER][FRONT_RIGHT] = aluSqrt(0.5);
Matrix[SIDE_LEFT][FRONT_LEFT] = aluSqrt(0.5);
Matrix[SIDE_LEFT][BACK_LEFT] = aluSqrt(0.5);
Matrix[SIDE_RIGHT][FRONT_RIGHT] = aluSqrt(0.5);
Matrix[SIDE_RIGHT][BACK_RIGHT] = aluSqrt(0.5);
Matrix[BACK_CENTER][BACK_LEFT] = aluSqrt(0.5);
Matrix[BACK_CENTER][BACK_RIGHT] = aluSqrt(0.5);
Device->NumChan = 4;
Speaker2Chan[0] = BACK_LEFT;
Speaker2Chan[1] = FRONT_LEFT;
Speaker2Chan[2] = FRONT_RIGHT;
Speaker2Chan[3] = BACK_RIGHT;
SpeakerAngle[0] = -135.0f * M_PI/180.0f;
SpeakerAngle[1] = -45.0f * M_PI/180.0f;
SpeakerAngle[2] = 45.0f * M_PI/180.0f;
SpeakerAngle[3] = 135.0f * M_PI/180.0f;
SetSpeakerArrangement("layout_QUAD", SpeakerAngle, Speaker2Chan, Device->NumChan);
break;
case DevFmtX51:
Matrix[SIDE_LEFT][FRONT_LEFT] = aluSqrt(0.5);
Matrix[SIDE_LEFT][BACK_LEFT] = aluSqrt(0.5);
Matrix[SIDE_RIGHT][FRONT_RIGHT] = aluSqrt(0.5);
Matrix[SIDE_RIGHT][BACK_RIGHT] = aluSqrt(0.5);
Matrix[BACK_CENTER][BACK_LEFT] = aluSqrt(0.5);
Matrix[BACK_CENTER][BACK_RIGHT] = aluSqrt(0.5);
Device->NumChan = 5;
Speaker2Chan[0] = BACK_LEFT;
Speaker2Chan[1] = FRONT_LEFT;
Speaker2Chan[2] = FRONT_CENTER;
Speaker2Chan[3] = FRONT_RIGHT;
Speaker2Chan[4] = BACK_RIGHT;
SpeakerAngle[0] = -110.0f * M_PI/180.0f;
SpeakerAngle[1] = -30.0f * M_PI/180.0f;
SpeakerAngle[2] = 0.0f * M_PI/180.0f;
SpeakerAngle[3] = 30.0f * M_PI/180.0f;
SpeakerAngle[4] = 110.0f * M_PI/180.0f;
SetSpeakerArrangement("layout_51CHN", SpeakerAngle, Speaker2Chan, Device->NumChan);
break;
case DevFmtX61:
Matrix[BACK_LEFT][BACK_CENTER] = aluSqrt(0.5);
Matrix[BACK_LEFT][SIDE_LEFT] = aluSqrt(0.5);
Matrix[BACK_RIGHT][BACK_CENTER] = aluSqrt(0.5);
Matrix[BACK_RIGHT][SIDE_RIGHT] = aluSqrt(0.5);
Device->NumChan = 6;
Speaker2Chan[0] = SIDE_LEFT;
Speaker2Chan[1] = FRONT_LEFT;
Speaker2Chan[2] = FRONT_CENTER;
Speaker2Chan[3] = FRONT_RIGHT;
Speaker2Chan[4] = SIDE_RIGHT;
Speaker2Chan[5] = BACK_CENTER;
SpeakerAngle[0] = -90.0f * M_PI/180.0f;
SpeakerAngle[1] = -30.0f * M_PI/180.0f;
SpeakerAngle[2] = 0.0f * M_PI/180.0f;
SpeakerAngle[3] = 30.0f * M_PI/180.0f;
SpeakerAngle[4] = 90.0f * M_PI/180.0f;
SpeakerAngle[5] = 180.0f * M_PI/180.0f;
SetSpeakerArrangement("layout_61CHN", SpeakerAngle, Speaker2Chan, Device->NumChan);
break;
case DevFmtX71:
Matrix[BACK_CENTER][BACK_LEFT] = aluSqrt(0.5);
Matrix[BACK_CENTER][BACK_RIGHT] = aluSqrt(0.5);
Device->NumChan = 7;
Speaker2Chan[0] = BACK_LEFT;
Speaker2Chan[1] = SIDE_LEFT;
Speaker2Chan[2] = FRONT_LEFT;
Speaker2Chan[3] = FRONT_CENTER;
Speaker2Chan[4] = FRONT_RIGHT;
Speaker2Chan[5] = SIDE_RIGHT;
Speaker2Chan[6] = BACK_RIGHT;
SpeakerAngle[0] = -150.0f * M_PI/180.0f;
SpeakerAngle[1] = -90.0f * M_PI/180.0f;
SpeakerAngle[2] = -30.0f * M_PI/180.0f;
SpeakerAngle[3] = 0.0f * M_PI/180.0f;
SpeakerAngle[4] = 30.0f * M_PI/180.0f;
SpeakerAngle[5] = 90.0f * M_PI/180.0f;
SpeakerAngle[6] = 150.0f * M_PI/180.0f;
SetSpeakerArrangement("layout_71CHN", SpeakerAngle, Speaker2Chan, Device->NumChan);
break;
}
if(GetConfigValueBool(NULL, "scalemix", 0))
{
ALfloat maxout = 1.0f;
for(s = 0;s < MAXCHANNELS;s++)
{
ALfloat out = 0.0f;
for(s2 = 0;s2 < MAXCHANNELS;s2++)
out += Device->ChannelMatrix[s2][s];
maxout = __max(maxout, out);
}
maxout = 1.0f/maxout;
for(s = 0;s < MAXCHANNELS;s++)
{
for(s2 = 0;s2 < MAXCHANNELS;s2++)
Device->ChannelMatrix[s2][s] *= maxout;
}
}
PanningLUT = Device->PanningLUT;
for(pos = 0; pos < LUT_NUM; pos++)
{
/* clear all values */
offset = MAXCHANNELS * pos;
for(s = 0; s < MAXCHANNELS; s++)
PanningLUT[offset+s] = 0.0f;
if(Device->NumChan == 1)
{
PanningLUT[offset + Speaker2Chan[0]] = 1.0f;
continue;
}
/* source angle */
Theta = aluLUTpos2Angle(pos);
/* set panning values */
for(s = 0; s < Device->NumChan - 1; s++)
{
if(Theta >= SpeakerAngle[s] && Theta < SpeakerAngle[s+1])
{
/* source between speaker s and speaker s+1 */
Alpha = M_PI_2 * (Theta-SpeakerAngle[s]) /
(SpeakerAngle[s+1]-SpeakerAngle[s]);
PanningLUT[offset + Speaker2Chan[s]] = cos(Alpha);
PanningLUT[offset + Speaker2Chan[s+1]] = sin(Alpha);
break;
}
}
if(s == Device->NumChan - 1)
{
/* source between last and first speaker */
if(Theta < SpeakerAngle[0])
Theta += 2.0f * M_PI;
Alpha = M_PI_2 * (Theta-SpeakerAngle[s]) /
(2.0f * M_PI + SpeakerAngle[0]-SpeakerAngle[s]);
PanningLUT[offset + Speaker2Chan[s]] = cos(Alpha);
PanningLUT[offset + Speaker2Chan[0]] = sin(Alpha);
}
}
}
