Alc/panning.c

   1 /**
   2  * OpenAL cross platform audio library
   3  * Copyright (C) 1999-2010 by authors.
   4  * This library is free software; you can redistribute it and/or
   5  *  modify it under the terms of the GNU Library General Public
   6  *  License as published by the Free Software Foundation; either
   7  *  version 2 of the License, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful,
  10  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  *  Library General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Library General Public
  15  *  License along with this library; if not, write to the
  16  *  Free Software Foundation, Inc.,
  17  *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  18  * Or go to http://www.gnu.org/copyleft/lgpl.html
  19  */
  20
  21 #include "config.h"
  22
  23 #include <math.h>
  24 #include <stdlib.h>
  25 #include <string.h>
  26 #include <ctype.h>
  27 #include <assert.h>
  28
  29 #include "alMain.h"
  30 #include "AL/al.h"
  31 #include "AL/alc.h"
  32 #include "alu.h"
  33 #include "bool.h"
  34
  35
  36 void ComputeAngleGains(const ALCdevice *device, ALfloat angle, ALfloat elevation, ALfloat ingain, ALfloat gains[MAX_OUTPUT_CHANNELS])
  37 {
  38     ALfloat dir[3] = {
  39         sinf(angle) * cosf(elevation),
  40         sinf(elevation),
  41         -cosf(angle) * cosf(elevation)
  42     };
  43     ComputeDirectionalGains(device, dir, ingain, gains);
  44 }
  45
  46 void ComputeDirectionalGains(const ALCdevice *device, const ALfloat dir[3], ALfloat ingain, ALfloat gains[MAX_OUTPUT_CHANNELS])
  47 {
  48     ALfloat coeffs[MAX_AMBI_COEFFS];
  49     ALuint i, j;
  50     /* Convert from OpenAL coords to Ambisonics. */
  51     ALfloat x = -dir[2];
  52     ALfloat y = -dir[0];
  53     ALfloat z =  dir[1];
  54
  55     coeffs[0] = 0.7071f; /* sqrt(1.0 / 2.0) */
  56     coeffs[1] = x; /* X */
  57     coeffs[2] = y; /* Y */
  58     coeffs[3] = z; /* Z */
  59     coeffs[4] = 0.5f * (3.0f*z*z - 1.0f); /* 0.5 * (3*Z*Z - 1) */
  60     coeffs[5] = 2.0f * z * x; /* 2*Z*X */
  61     coeffs[6] = 2.0f * y * z; /* 2*Y*Z */
  62     coeffs[7] = x*x - y*y; /* X*X - Y*Y */
  63     coeffs[8] = 2.0f * x * y; /* 2*X*Y */
  64     coeffs[9] = 0.5f * z * (5.0f*z*z - 3.0f); /* 0.5 * Z * (5*Z*Z - 3) */
  65     coeffs[10] = 0.7262f * x * (5.0f*z*z - 1.0f); /* sqrt(135.0 / 256.0) * X * (5*Z*Z - 1) */
  66     coeffs[11] = 0.7262f * y * (5.0f*z*z - 1.0f); /* sqrt(135.0 / 256.0) * Y * (5*Z*Z - 1) */
  67     coeffs[12] = 2.5981f * z * (x*x - y*y); /* sqrt(27.0 / 4.0) * Z * (X*X - Y*Y) */
  68     coeffs[13] = 5.1962f * x * y * z; /* sqrt(27) * X * Y * Z */
  69     coeffs[14] = x * (x*x - 3.0f*y*y); /* X * (X*X - 3*Y*Y) */
  70     coeffs[15] = y * (3.0f*x*x - y*y); /* Y * (3*X*X - Y*Y) */
  71
  72     for(i = 0;i < MAX_OUTPUT_CHANNELS;i++)
  73         gains[i] = 0.0f;
  74     for(i = 0;i < device->NumChannels;i++)
  75     {
  76         for(j = 0;j < MAX_AMBI_COEFFS;j++)
  77             gains[i] += device->Channel[i].HOACoeff[j]*coeffs[j];
  78         gains[i] *= ingain;
  79     }
  80 }
  81
  82 void ComputeAmbientGains(const ALCdevice *device, ALfloat ingain, ALfloat gains[MAX_OUTPUT_CHANNELS])
  83 {
  84     ALuint i;
  85
  86     for(i = 0;i < MAX_OUTPUT_CHANNELS;i++)
  87         gains[i] = 0.0f;
  88     for(i = 0;i < device->NumChannels;i++)
  89     {
  90         // The W coefficients are based on a mathematical average of the
  91         // output, scaled by sqrt(2) to compensate for FuMa-style Ambisonics
  92         // scaling the W channel input by sqrt(0.5). The square root of the
  93         // base average provides for a more perceptual average volume, better
  94         // suited to non-directional gains.
  95         gains[i] = sqrtf(device->Channel[i].HOACoeff[0]/1.4142f) * ingain;
  96     }
  97 }
  98
  99 void ComputeBFormatGains(const ALCdevice *device, const ALfloat mtx[4], ALfloat ingain, ALfloat gains[MAX_OUTPUT_CHANNELS])
 100 {
 101     ALuint i, j;
 102
 103     for(i = 0;i < MAX_OUTPUT_CHANNELS;i++)
 104         gains[i] = 0.0f;
 105     for(i = 0;i < device->NumChannels;i++)
 106     {
 107         for(j = 0;j < 4;j++)
 108             gains[i] += device->Channel[i].FOACoeff[j] * mtx[j];
 109         gains[i] *= ingain;
 110     }
 111 }
 112
 113
 114 DECL_CONST static inline const char *GetLabelFromChannel(enum Channel channel)
 115 {
 116     switch(channel)
 117     {
 118         case FrontLeft: return "front-left";
 119         case FrontRight: return "front-right";
 120         case FrontCenter: return "front-center";
 121         case LFE: return "lfe";
 122         case BackLeft: return "back-left";
 123         case BackRight: return "back-right";
 124         case BackCenter: return "back-center";
 125         case SideLeft: return "side-left";
 126         case SideRight: return "side-right";
 127
 128         case TopFrontLeft: return "top-front-left";
 129         case TopFrontRight: return "top-front-right";
 130         case TopBackLeft: return "top-back-left";
 131         case TopBackRight: return "top-back-right";
 132         case BottomFrontLeft: return "bottom-front-left";
 133         case BottomFrontRight: return "bottom-front-right";
 134         case BottomBackLeft: return "bottom-back-left";
 135         case BottomBackRight: return "bottom-back-right";
 136
 137         case Aux0: return "aux-0";
 138         case Aux1: return "aux-1";
 139         case Aux2: return "aux-2";
 140         case Aux3: return "aux-3";
 141
 142         case InvalidChannel: break;
 143     }
 144     return "(unknown)";
 145 }
 146
 147
 148 typedef struct ChannelMap {
 149     enum Channel ChanName;
 150     ChannelConfig Config;
 151 } ChannelMap;
 152
 153 static void SetChannelMap(ALCdevice *device, const ChannelMap *chanmap, size_t count)
 154 {
 155     size_t i, j;
 156
 157     for(i = 0;i < MAX_OUTPUT_CHANNELS && device->ChannelName[i] != InvalidChannel;i++)
 158     {
 159         if(device->ChannelName[i] == LFE)
 160         {
 161             for(j = 0;j < MAX_AMBI_COEFFS;j++)
 162                 device->Channel[i].HOACoeff[j] = 0.0f;
 163             for(j = 0;j < 4;j++)
 164                 device->Channel[i].FOACoeff[j] = 0.0f;
 165             continue;
 166         }
 167
 168         for(j = 0;j < count;j++)
 169         {
 170             if(device->ChannelName[i] == chanmap[j].ChanName)
 171             {
 172                 device->Channel[i] = chanmap[j].Config;
 173                 break;
 174             }
 175         }
 176         if(j == count)
 177             ERR("Failed to match %s channel ("SZFMT") in config\n", GetLabelFromChannel(device->ChannelName[i]), i);
 178     }
 179     device->NumChannels = i;
 180 }
 181
 182 static bool LoadChannelSetup(ALCdevice *device)
 183 {
 184     static const enum Channel mono_chans[1] = {
 185         FrontCenter
 186     }, stereo_chans[2] = {
 187         FrontLeft, FrontRight
 188     }, quad_chans[4] = {
 189         FrontLeft, FrontRight,
 190         BackLeft, BackRight
 191     }, surround51_chans[5] = {
 192         FrontLeft, FrontRight, FrontCenter,
 193         SideLeft, SideRight
 194     }, surround51rear_chans[5] = {
 195         FrontLeft, FrontRight, FrontCenter,
 196         BackLeft, BackRight
 197     }, surround61_chans[6] = {
 198         FrontLeft, FrontRight,
 199         FrontCenter, BackCenter,
 200         SideLeft, SideRight
 201     }, surround71_chans[7] = {
 202         FrontLeft, FrontRight, FrontCenter,
 203         BackLeft, BackRight,
 204         SideLeft, SideRight
 205     };
 206     ChannelMap chanmap[MAX_OUTPUT_CHANNELS];
 207     const enum Channel *channels = NULL;
 208     const char *layout = NULL;
 209     size_t count = 0;
 210     size_t i;
 211
 212     switch(device->FmtChans)
 213     {
 214         case DevFmtMono:
 215             layout = "mono";
 216             channels = mono_chans;
 217             count = COUNTOF(mono_chans);
 218             break;
 219         case DevFmtStereo:
 220             layout = "stereo";
 221             channels = stereo_chans;
 222             count = COUNTOF(stereo_chans);
 223             break;
 224         case DevFmtQuad:
 225             layout = "quad";
 226             channels = quad_chans;
 227             count = COUNTOF(quad_chans);
 228             break;
 229         case DevFmtX51:
 230             layout = "surround51";
 231             channels = surround51_chans;
 232             count = COUNTOF(surround51_chans);
 233             break;
 234         case DevFmtX51Rear:
 235             layout = "surround51rear";
 236             channels = surround51rear_chans;
 237             count = COUNTOF(surround51rear_chans);
 238             break;
 239         case DevFmtX61:
 240             layout = "surround61";
 241             channels = surround61_chans;
 242             count = COUNTOF(surround61_chans);
 243             break;
 244         case DevFmtX71:
 245             layout = "surround71";
 246             channels = surround71_chans;
 247             count = COUNTOF(surround71_chans);
 248             break;
 249         case DevFmtBFormat3D:
 250             break;
 251     }
 252
 253     if(!layout)
 254         return false;
 255     else
 256     {
 257         char name[32];
 258         snprintf(name, sizeof(name), "%s/enable", layout);
 259         if(!GetConfigValueBool("layouts", name, 0))
 260             return false;
 261     }
 262
 263     for(i = 0;i < count;i++)
 264     {
 265         const char *channame;
 266         char chanlayout[32];
 267         const char *value;
 268         int props;
 269
 270         chanmap[i].ChanName = channels[i];
 271         channame = GetLabelFromChannel(channels[i]);
 272
 273         snprintf(chanlayout, sizeof(chanlayout), "%s/%s", layout, channame);
 274         if(!ConfigValueStr("layouts", chanlayout, &value))
 275         {
 276             ERR("Missing channel %s\n", channame);
 277             return false;
 278         }
 279         props = sscanf(value, " %f %f %f %f %f %f %f %f %f %f %f %f %f %f %f %f ; %f %f %f %f",
 280             &chanmap[i].Config.HOACoeff[0], &chanmap[i].Config.HOACoeff[1], &chanmap[i].Config.HOACoeff[2],
 281             &chanmap[i].Config.HOACoeff[3], &chanmap[i].Config.HOACoeff[4], &chanmap[i].Config.HOACoeff[5],
 282             &chanmap[i].Config.HOACoeff[6], &chanmap[i].Config.HOACoeff[7], &chanmap[i].Config.HOACoeff[8],
 283             &chanmap[i].Config.HOACoeff[9], &chanmap[i].Config.HOACoeff[10], &chanmap[i].Config.HOACoeff[11],
 284             &chanmap[i].Config.HOACoeff[12], &chanmap[i].Config.HOACoeff[13], &chanmap[i].Config.HOACoeff[14],
 285             &chanmap[i].Config.HOACoeff[15], &chanmap[i].Config.FOACoeff[0], &chanmap[i].Config.FOACoeff[1],
 286             &chanmap[i].Config.FOACoeff[2], &chanmap[i].Config.FOACoeff[3]);
 287         if(props == 0)
 288         {
 289             ERR("Failed to parse %s channel's properties\n", channame);
 290             return false;
 291         }
 292
 293         if(props < 20)
 294         {
 295             ERR("Failed to parse %s channel's elements (expected 20, got %d)\n", channame, props);
 296             return false;
 297         }
 298     }
 299     SetChannelMap(device, chanmap, count);
 300     return true;
 301 }
 302
 303 ALvoid aluInitPanning(ALCdevice *device)
 304 {
 305     static const ChannelMap MonoCfg[1] = {
 306         { FrontCenter, { { 1.4142f }, { 1.4142f } } },
 307     }, StereoCfg[2] = {
 308         { FrontLeft,   { { 0.7071f, 0.0f,  0.5f, 0.0f }, { 0.7071f, 0.0f,  0.5f, 0.0f } } },
 309         { FrontRight,  { { 0.7071f, 0.0f, -0.5f, 0.0f }, { 0.7071f, 0.0f, -0.5f, 0.0f } } },
 310     }, QuadCfg[4] = {
 311         { FrontLeft,   { { 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  } } },
 312         { FrontRight,  { { 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  } } },
 313         { BackLeft,    { { 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  } } },
 314         { BackRight,   { { 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  } } },
 315     }, X51SideCfg[5] = {
 316         { FrontLeft,   { { 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 } } },
 317         { FrontRight,  { { 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 } } },
 318         { FrontCenter, { { 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 } } },
 319         { SideLeft,    { { 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 } } },
 320         { SideRight,   { { 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 } } },
 321     }, X51RearCfg[5] = {
 322         { FrontLeft,   { { 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 } } },
 323         { FrontRight,  { { 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 } } },
 324         { FrontCenter, { { 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 } } },
 325         { BackLeft,    { { 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 } } },
 326         { BackRight,   { { 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 } } },
 327     }, X61Cfg[6] = {
 328         { FrontLeft,   { { 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 } } },
 329         { FrontRight,  { { 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 } } },
 330         { FrontCenter, { { 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 } } },
 331         { BackCenter,  { { 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 } } },
 332         { SideLeft,    { { 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 } } },
 333         { SideRight,   { { 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 } } },
 334     }, X71Cfg[7] = {
 335         { FrontLeft,   { { 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 } } },
 336         { FrontRight,  { { 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 } } },
 337         { FrontCenter, { { 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 } } },
 338         { BackLeft,    { { 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 } } },
 339         { BackRight,   { { 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 } } },
 340         { SideLeft,    { { 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 } } },
 341         { SideRight,   { { 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 } } },
 342     }, Cube8[8] = {
 343         { TopFrontLeft,     { { 0.176777f,  0.125000f,  0.125000f,  0.125000f }, { 0.176777f,  0.125000f,  0.125000f,  0.125000f } } },
 344         { TopFrontRight,    { { 0.176777f,  0.125000f, -0.125000f,  0.125000f }, { 0.176777f,  0.125000f, -0.125000f,  0.125000f } } },
 345         { TopBackLeft,      { { 0.176777f, -0.125000f,  0.125000f,  0.125000f }, { 0.176777f, -0.125000f,  0.125000f,  0.125000f } } },
 346         { TopBackRight,     { { 0.176777f, -0.125000f, -0.125000f,  0.125000f }, { 0.176777f, -0.125000f, -0.125000f,  0.125000f } } },
 347         { BottomFrontLeft,  { { 0.176777f,  0.125000f,  0.125000f, -0.125000f }, { 0.176777f,  0.125000f,  0.125000f, -0.125000f } } },
 348         { BottomFrontRight, { { 0.176777f,  0.125000f, -0.125000f, -0.125000f }, { 0.176777f,  0.125000f, -0.125000f, -0.125000f } } },
 349         { BottomBackLeft,   { { 0.176777f, -0.125000f,  0.125000f, -0.125000f }, { 0.176777f, -0.125000f,  0.125000f, -0.125000f } } },
 350         { BottomBackRight,  { { 0.176777f, -0.125000f, -0.125000f, -0.125000f }, { 0.176777f, -0.125000f, -0.125000f, -0.125000f } } },
 351     }, BFormat3D[4] = {
 352         { Aux0, { { 1.0f, 0.0f, 0.0f, 0.0f }, { 1.0f, 0.0f, 0.0f, 0.0f } } },
 353         { Aux1, { { 0.0f, 1.0f, 0.0f, 0.0f }, { 0.0f, 1.0f, 0.0f, 0.0f } } },
 354         { Aux2, { { 0.0f, 0.0f, 1.0f, 0.0f }, { 0.0f, 0.0f, 1.0f, 0.0f } } },
 355         { Aux3, { { 0.0f, 0.0f, 0.0f, 1.0f }, { 0.0f, 0.0f, 0.0f, 1.0f } } },
 356     };
 357     const ChannelMap *chanmap = NULL;
 358     size_t count = 0;
 359
 360     memset(device->Channel, 0, sizeof(device->Channel));
 361     device->NumChannels = 0;
 362
 363     if(device->Hrtf)
 364     {
 365         static const struct {
 366             enum Channel channel;
 367             ALfloat elevation;
 368             ALfloat angle;
 369         } VirtualChans[8] = {
 370             { TopFrontLeft,     DEG2RAD( 45.0f), DEG2RAD( -45.0f) },
 371             { TopFrontRight,    DEG2RAD( 45.0f), DEG2RAD(  45.0f) },
 372             { TopBackLeft,      DEG2RAD( 45.0f), DEG2RAD(-135.0f) },
 373             { TopBackRight,     DEG2RAD( 45.0f), DEG2RAD( 135.0f) },
 374             { BottomFrontLeft,  DEG2RAD(-45.0f), DEG2RAD( -45.0f) },
 375             { BottomFrontRight, DEG2RAD(-45.0f), DEG2RAD(  45.0f) },
 376             { BottomBackLeft,   DEG2RAD(-45.0f), DEG2RAD(-135.0f) },
 377             { BottomBackRight,  DEG2RAD(-45.0f), DEG2RAD( 135.0f) },
 378         };
 379         ALuint i;
 380
 381         count = COUNTOF(Cube8);
 382         chanmap = Cube8;
 383
 384         for(i = 0;i < count;i++)
 385             device->ChannelName[i] = VirtualChans[i].channel;
 386         SetChannelMap(device, chanmap, count);
 387         for(i = 0;i < count;i++)
 388             GetLerpedHrtfCoeffs(
 389                 device->Hrtf, VirtualChans[i].elevation, VirtualChans[i].angle, 1.0f, 1.0f,
 390                 device->Hrtf_Params[i].Coeffs, device->Hrtf_Params[i].Delay
 391             );
 392
 393         return;
 394     }
 395
 396     if(LoadChannelSetup(device))
 397         return;
 398
 399     switch(device->FmtChans)
 400     {
 401         case DevFmtMono:
 402             count = COUNTOF(MonoCfg);
 403             chanmap = MonoCfg;
 404             break;
 405
 406         case DevFmtStereo:
 407             count = COUNTOF(StereoCfg);
 408             chanmap = StereoCfg;
 409             break;
 410
 411         case DevFmtQuad:
 412             count = COUNTOF(QuadCfg);
 413             chanmap = QuadCfg;
 414             break;
 415
 416         case DevFmtX51:
 417             count = COUNTOF(X51SideCfg);
 418             chanmap = X51SideCfg;
 419             break;
 420
 421         case DevFmtX51Rear:
 422             count = COUNTOF(X51RearCfg);
 423             chanmap = X51RearCfg;
 424             break;
 425
 426         case DevFmtX61:
 427             count = COUNTOF(X61Cfg);
 428             chanmap = X61Cfg;
 429             break;
 430
 431         case DevFmtX71:
 432             count = COUNTOF(X71Cfg);
 433             chanmap = X71Cfg;
 434             break;
 435
 436         case DevFmtBFormat3D:
 437             count = COUNTOF(BFormat3D);
 438             chanmap = BFormat3D;
 439             break;
 440     }
 441
 442     SetChannelMap(device, chanmap, count);
 443 }