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/**
* OpenAL cross platform audio library
* Copyright (C) 1999-2010 by authors.
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
* Or go to http://www.gnu.org/copyleft/lgpl.html
*/
#include "config.h"
#include <math.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <assert.h>
#include "alMain.h"
#include "AL/al.h"
#include "AL/alc.h"
#include "alu.h"
void ComputeAngleGains(const ALCdevice *device, ALfloat angle, ALfloat elevation, ALfloat ingain, ALfloat gains[MaxChannels])
{
ALfloat dir[3] = {
sinf(angle) * cosf(elevation),
sinf(elevation),
-cosf(angle) * cosf(elevation)
};
ComputeDirectionalGains(device, dir, ingain, gains);
}
void ComputeDirectionalGains(const ALCdevice *device, const ALfloat dir[3], ALfloat ingain, ALfloat gains[MaxChannels])
{
ALfloat coeffs[MAX_AMBI_COEFFS];
ALuint i, j;
/* Convert from OpenAL coords to Ambisonics. */
ALfloat x = -dir[2];
ALfloat y = -dir[0];
ALfloat z = dir[1];
coeffs[0] = 0.7071f; /* sqrt(1.0 / 2.0) */
coeffs[1] = x; /* X */
coeffs[2] = y; /* Y */
coeffs[3] = z; /* Z */
coeffs[4] = 0.5f * (3.0f*z*z - 1.0f); /* 0.5 * (3*Z*Z - 1) */
coeffs[5] = 2.0f * z * x; /* 2*Z*X */
coeffs[6] = 2.0f * y * z; /* 2*Y*Z */
coeffs[7] = x*x - y*y; /* X*X - Y*Y */
coeffs[8] = 2.0f * x * y; /* 2*X*Y */
coeffs[9] = 0.5f * z * (5.0f*z*z - 3.0f); /* 0.5 * Z * (5*Z*Z - 3) */
coeffs[10] = 0.7262f * x * (5.0f*z*z - 1.0f); /* sqrt(135.0 / 256.0) * X * (5*Z*Z - 1) */
coeffs[11] = 0.7262f * y * (5.0f*z*z - 1.0f); /* sqrt(135.0 / 256.0) * Y * (5*Z*Z - 1) */
coeffs[12] = 2.5981f * z * (x*x - y*y); /* sqrt(27.0 / 4.0) * Z * (X*X - Y*Y) */
coeffs[13] = 5.1962f * x * y * z; /* sqrt(27) * X * Y * Z */
coeffs[14] = x * (x*x - 3.0f*y*y); /* X * (X*X - 3*Y*Y) */
coeffs[15] = y * (3.0f*x*x - y*y); /* Y * (3*X*X - Y*Y) */
for(i = 0;i < MaxChannels;i++)
gains[i] = 0.0f;
for(i = 0;i < device->NumSpeakers;i++)
{
for(j = 0;j < MAX_AMBI_COEFFS;j++)
gains[i] += device->Speaker[i].HOACoeff[j]*coeffs[j];
gains[i] = maxf(gains[i], 0.0f) * ingain;
}
}
void ComputeAmbientGains(const ALCdevice *device, ALfloat ingain, ALfloat gains[MaxChannels])
{
ALuint i;
for(i = 0;i < MaxChannels;i++)
gains[i] = 0.0f;
for(i = 0;i < device->NumSpeakers;i++)
gains[i] = device->Speaker[i].HOACoeff[0] * ingain;
}
void ComputeBFormatGains(const ALCdevice *device, const ALfloat mtx[4], ALfloat ingain, ALfloat gains[MaxChannels])
{
ALuint i, j;
for(i = 0;i < MaxChannels;i++)
gains[i] = 0.0f;
for(i = 0;i < device->NumSpeakers;i++)
{
for(j = 0;j < 4;j++)
gains[i] += device->Speaker[i].FOACoeff[j] * mtx[j];
gains[i] *= ingain;
}
}
typedef struct ChannelMap {
enum Channel ChanName;
ChannelConfig Config;
} ChannelMap;
ALvoid aluInitPanning(ALCdevice *device)
{
static const ChannelMap MonoCfg[1] = {
{ FrontCenter, { DEG2RAD(0.0f), DEG2RAD(0.0f), { 1.4142f }, { 1.4142f } } },
}, StereoCfg[2] = {
{ FrontLeft, { DEG2RAD(-90.0f), DEG2RAD(0.0f), { 0.7071f, 0.0f, 0.5f, 0.0f }, { 0.7071f, 0.0f, 0.5f, 0.0f } } },
{ FrontRight, { DEG2RAD( 90.0f), DEG2RAD(0.0f), { 0.7071f, 0.0f, -0.5f, 0.0f }, { 0.7071f, 0.0f, -0.5f, 0.0f } } },
}, QuadCfg[4] = {
{ FrontLeft, { DEG2RAD( -45.0f), DEG2RAD(0.0f), { 0.353558f, 0.306181f, 0.306192f, 0.0f, 0.0f, 0.0f, 0.0f, 0.000000f, 0.117183f }, { 0.353553f, 0.250000f, 0.250000f, 0.0f } } },
{ FrontRight, { DEG2RAD( 45.0f), DEG2RAD(0.0f), { 0.353543f, 0.306181f, -0.306192f, 0.0f, 0.0f, 0.0f, 0.0f, 0.000000f, -0.117193f }, { 0.353553f, 0.250000f, -0.250000f, 0.0f } } },
{ BackLeft, { DEG2RAD(-135.0f), DEG2RAD(0.0f), { 0.353543f, -0.306192f, 0.306181f, 0.0f, 0.0f, 0.0f, 0.0f, 0.000000f, -0.117193f }, { 0.353553f, -0.250000f, 0.250000f, 0.0f } } },
{ BackRight, { DEG2RAD( 135.0f), DEG2RAD(0.0f), { 0.353558f, -0.306192f, -0.306181f, 0.0f, 0.0f, 0.0f, 0.0f, 0.000000f, 0.117183f }, { 0.353553f, -0.250000f, -0.250000f, 0.0f } } },
}, X51Cfg[6] = {
{ FrontLeft, { DEG2RAD( -30.0f), DEG2RAD(0.0f), { 0.208954f, 0.212846f, 0.238350f, 0.0f, 0.0f, 0.0f, 0.0f, -0.017738f, 0.204014f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, -0.051023f, 0.047490f }, { 0.208954f, 0.162905f, 0.182425f, 0.0f } } },
{ FrontRight, { DEG2RAD( 30.0f), DEG2RAD(0.0f), { 0.208954f, 0.212846f, -0.238350f, 0.0f, 0.0f, 0.0f, 0.0f, -0.017738f, -0.204014f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, -0.051023f, -0.047490f }, { 0.208954f, 0.162905f, -0.182425f, 0.0f } } },
{ FrontCenter, { DEG2RAD( 0.0f), DEG2RAD(0.0f), { 0.109403f, 0.179490f, 0.000000f, 0.0f, 0.0f, 0.0f, 0.0f, 0.142031f, -0.000002f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.072024f, -0.000001f }, { 0.109403f, 0.137375f, 0.000000f, 0.0f } } },
{ LFE, { 0.0f, 0.0f, { 0.0f }, { 0.0f } } },
{ BackLeft, { DEG2RAD(-110.0f), DEG2RAD(0.0f), { 0.470936f, -0.369626f, 0.349386f, 0.0f, 0.0f, 0.0f, 0.0f, -0.031375f, -0.058144f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, -0.007119f, -0.043968f }, { 0.470934f, -0.282903f, 0.267406f, 0.0f } } },
{ BackRight, { DEG2RAD( 110.0f), DEG2RAD(0.0f), { 0.470936f, -0.369626f, -0.349386f, 0.0f, 0.0f, 0.0f, 0.0f, -0.031375f, 0.058144f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, -0.007119f, 0.043968f }, { 0.470934f, -0.282903f, -0.267406f, 0.0f } } },
}, X51SideCfg[6] = {
{ FrontLeft, { DEG2RAD(-30.0f), DEG2RAD(0.0f), { 0.167065f, 0.200583f, 0.172695f, 0.0f, 0.0f, 0.0f, 0.0f, 0.029855f, 0.186407f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, -0.039241f, 0.068910f }, { 0.167065f, 0.153519f, 0.132175f, 0.0f } } },
{ FrontRight, { DEG2RAD( 30.0f), DEG2RAD(0.0f), { 0.167065f, 0.200583f, -0.172695f, 0.0f, 0.0f, 0.0f, 0.0f, 0.029855f, -0.186407f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, -0.039241f, -0.068910f }, { 0.167065f, 0.153519f, -0.132175f, 0.0f } } },
{ FrontCenter, { DEG2RAD( 0.0f), DEG2RAD(0.0f), { 0.109403f, 0.179490f, 0.000000f, 0.0f, 0.0f, 0.0f, 0.0f, 0.142031f, 0.000000f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.072024f, 0.000000f }, { 0.109403f, 0.137375f, 0.000000f, 0.0f } } },
{ LFE, { 0.0f, 0.0f, { 0.0f }, { 0.0f } } },
{ SideLeft, { DEG2RAD(-90.0f), DEG2RAD(0.0f), { 0.289151f, -0.081301f, 0.401292f, 0.0f, 0.0f, 0.0f, 0.0f, -0.188208f, -0.071420f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.010099f, -0.032897f }, { 0.289151f, -0.062225f, 0.307136f, 0.0f } } },
{ SideRight, { DEG2RAD( 90.0f), DEG2RAD(0.0f), { 0.289151f, -0.081301f, -0.401292f, 0.0f, 0.0f, 0.0f, 0.0f, -0.188208f, 0.071420f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.010099f, 0.032897f }, { 0.289151f, -0.062225f, -0.307136f, 0.0f } } },
}, X61Cfg[7] = {
{ FrontLeft, { DEG2RAD(-30.0f), DEG2RAD(0.0f), { 0.167065f, 0.200583f, 0.172695f, 0.0f, 0.0f, 0.0f, 0.0f, 0.029855f, 0.186407f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, -0.039241f, 0.068910f }, { 0.167065f, 0.153519f, 0.132175f, 0.0f } } },
{ FrontRight, { DEG2RAD( 30.0f), DEG2RAD(0.0f), { 0.167065f, 0.200583f, -0.172695f, 0.0f, 0.0f, 0.0f, 0.0f, 0.029855f, -0.186407f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, -0.039241f, -0.068910f }, { 0.167065f, 0.153519f, -0.132175f, 0.0f } } },
{ FrontCenter, { DEG2RAD( 0.0f), DEG2RAD(0.0f), { 0.109403f, 0.179490f, 0.000000f, 0.0f, 0.0f, 0.0f, 0.0f, 0.142031f, 0.000000f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.072024f, -0.000001f }, { 0.109403f, 0.137375f, 0.000000f, 0.0f } } },
{ LFE, { 0.0f, 0.0f, { 0.0f }, { 0.0f } } },
{ BackCenter, { DEG2RAD(180.0f), DEG2RAD(0.0f), { 0.353556f, -0.461940f, 0.000000f, 0.0f, 0.0f, 0.0f, 0.0f, 0.165723f, 0.000000f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.000000f, 0.000005f }, { 0.353556f, -0.353554f, 0.000000f, 0.0f } } },
{ SideLeft, { DEG2RAD(-90.0f), DEG2RAD(0.0f), { 0.289151f, -0.081301f, 0.401292f, 0.0f, 0.0f, 0.0f, 0.0f, -0.188208f, -0.071420f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.010099f, -0.032897f }, { 0.289151f, -0.062225f, 0.307136f, 0.0f } } },
{ SideRight, { DEG2RAD( 90.0f), DEG2RAD(0.0f), { 0.289151f, -0.081301f, -0.401292f, 0.0f, 0.0f, 0.0f, 0.0f, -0.188208f, 0.071420f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.010099f, 0.032897f }, { 0.289151f, -0.062225f, -0.307136f, 0.0f } } },
}, X71Cfg[8] = {
{ FrontLeft, { DEG2RAD( -30.0f), DEG2RAD(0.0f), { 0.167065f, 0.200583f, 0.172695f, 0.0f, 0.0f, 0.0f, 0.0f, 0.029855f, 0.186407f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, -0.039241f, 0.068910f }, { 0.167065f, 0.153519f, 0.132175f, 0.0f } } },
{ FrontRight, { DEG2RAD( 30.0f), DEG2RAD(0.0f), { 0.167065f, 0.200583f, -0.172695f, 0.0f, 0.0f, 0.0f, 0.0f, 0.029855f, -0.186407f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, -0.039241f, -0.068910f }, { 0.167065f, 0.153519f, -0.132175f, 0.0f } } },
{ FrontCenter, { DEG2RAD( 0.0f), DEG2RAD(0.0f), { 0.109403f, 0.179490f, 0.000000f, 0.0f, 0.0f, 0.0f, 0.0f, 0.142031f, 0.000000f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.072024f, 0.000000f }, { 0.109403f, 0.137375f, 0.000000f, 0.0f } } },
{ LFE, { 0.0f, 0.0f, { 0.0f }, { 0.0f } } },
{ BackLeft, { DEG2RAD(-150.0f), DEG2RAD(0.0f), { 0.224752f, -0.295009f, 0.170325f, 0.0f, 0.0f, 0.0f, 0.0f, 0.105349f, -0.182473f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.000000f, 0.065799f }, { 0.224752f, -0.225790f, 0.130361f, 0.0f } } },
{ BackRight, { DEG2RAD( 150.0f), DEG2RAD(0.0f), { 0.224752f, -0.295009f, -0.170325f, 0.0f, 0.0f, 0.0f, 0.0f, 0.105349f, 0.182473f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.000000f, -0.065799f }, { 0.224752f, -0.225790f, -0.130361f, 0.0f } } },
{ SideLeft, { DEG2RAD( -90.0f), DEG2RAD(0.0f), { 0.224739f, 0.000002f, 0.340644f, 0.0f, 0.0f, 0.0f, 0.0f, -0.210697f, 0.000002f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.000000f, -0.065795f }, { 0.224739f, 0.000000f, 0.260717f, 0.0f } } },
{ SideRight, { DEG2RAD( 90.0f), DEG2RAD(0.0f), { 0.224739f, 0.000002f, -0.340644f, 0.0f, 0.0f, 0.0f, 0.0f, -0.210697f, -0.000002f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.000000f, 0.065795f }, { 0.224739f, 0.000000f, -0.260717f, 0.0f } } },
};
const ChannelMap *chanmap = NULL;
size_t count = 0;
ALuint i, j;
memset(device->Speaker, 0, sizeof(device->Speaker));
device->NumSpeakers = 0;
switch(device->FmtChans)
{
case DevFmtMono:
count = COUNTOF(MonoCfg);
chanmap = MonoCfg;
break;
case DevFmtStereo:
count = COUNTOF(StereoCfg);
chanmap = StereoCfg;
break;
case DevFmtQuad:
count = COUNTOF(QuadCfg);
chanmap = QuadCfg;
break;
case DevFmtX51:
count = COUNTOF(X51Cfg);
chanmap = X51Cfg;
break;
case DevFmtX51Side:
count = COUNTOF(X51SideCfg);
chanmap = X51SideCfg;
break;
case DevFmtX61:
count = COUNTOF(X61Cfg);
chanmap = X61Cfg;
break;
case DevFmtX71:
count = COUNTOF(X71Cfg);
chanmap = X71Cfg;
break;
}
for(i = 0;i < MaxChannels && device->ChannelName[i] != InvalidChannel;i++)
{
for(j = 0;j < count;j++)
{
if(device->ChannelName[i] == chanmap[j].ChanName)
{
device->Speaker[i] = chanmap[j].Config;
break;
}
}
if(j == count)
ERR("Failed to match channel %u (label %d) in config\n", i, device->ChannelName[i]);
}
device->NumSpeakers = i;
}
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