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] = maxf(gains[i], 0.0f) * 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)*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 InvalidChannel: break;
 138     }
 139     return "(unknown)";
 140 }
 141
 142
 143 typedef struct ChannelMap {
 144     enum Channel ChanName;
 145     ChannelConfig Config;
 146 } ChannelMap;
 147
 148 static void SetChannelMap(ALCdevice *device, const ChannelMap *chanmap, size_t count)
 149 {
 150     size_t i, j;
 151
 152     for(i = 0;i < MAX_OUTPUT_CHANNELS && device->ChannelName[i] != InvalidChannel;i++)
 153     {
 154         if(device->ChannelName[i] == LFE)
 155         {
 156             for(j = 0;j < MAX_AMBI_COEFFS;j++)
 157                 device->Channel[i].HOACoeff[j] = 0.0f;
 158             for(j = 0;j < 4;j++)
 159                 device->Channel[i].FOACoeff[j] = 0.0f;
 160             continue;
 161         }
 162
 163         for(j = 0;j < count;j++)
 164         {
 165             if(device->ChannelName[i] == chanmap[j].ChanName)
 166             {
 167                 device->Channel[i] = chanmap[j].Config;
 168                 break;
 169             }
 170         }
 171         if(j == count)
 172             ERR("Failed to match %s channel ("SZFMT") in config\n", GetLabelFromChannel(device->ChannelName[i]), i);
 173     }
 174     device->NumChannels = i;
 175 }
 176
 177 static bool LoadChannelSetup(ALCdevice *device)
 178 {
 179     static const enum Channel mono_chans[1] = {
 180         FrontCenter
 181     }, stereo_chans[2] = {
 182         FrontLeft, FrontRight
 183     }, quad_chans[4] = {
 184         FrontLeft, FrontRight,
 185         BackLeft, BackRight
 186     }, surround51_chans[5] = {
 187         FrontLeft, FrontRight, FrontCenter,
 188         SideLeft, SideRight
 189     }, surround51rear_chans[5] = {
 190         FrontLeft, FrontRight, FrontCenter,
 191         BackLeft, BackRight
 192     }, surround61_chans[6] = {
 193         FrontLeft, FrontRight,
 194         FrontCenter, BackCenter,
 195         SideLeft, SideRight
 196     }, surround71_chans[7] = {
 197         FrontLeft, FrontRight, FrontCenter,
 198         BackLeft, BackRight,
 199         SideLeft, SideRight
 200     };
 201     ChannelMap chanmap[MAX_OUTPUT_CHANNELS];
 202     const enum Channel *channels = NULL;
 203     const char *layout = NULL;
 204     size_t count = 0;
 205     size_t i;
 206
 207     switch(device->FmtChans)
 208     {
 209         case DevFmtMono:
 210             layout = "mono";
 211             channels = mono_chans;
 212             count = COUNTOF(mono_chans);
 213             break;
 214         case DevFmtStereo:
 215             layout = "stereo";
 216             channels = stereo_chans;
 217             count = COUNTOF(stereo_chans);
 218             break;
 219         case DevFmtQuad:
 220             layout = "quad";
 221             channels = quad_chans;
 222             count = COUNTOF(quad_chans);
 223             break;
 224         case DevFmtX51:
 225             layout = "surround51";
 226             channels = surround51_chans;
 227             count = COUNTOF(surround51_chans);
 228             break;
 229         case DevFmtX51Rear:
 230             layout = "surround51rear";
 231             channels = surround51rear_chans;
 232             count = COUNTOF(surround51rear_chans);
 233             break;
 234         case DevFmtX61:
 235             layout = "surround61";
 236             channels = surround61_chans;
 237             count = COUNTOF(surround61_chans);
 238             break;
 239         case DevFmtX71:
 240             layout = "surround71";
 241             channels = surround71_chans;
 242             count = COUNTOF(surround71_chans);
 243             break;
 244     }
 245
 246     if(!layout)
 247         return false;
 248     else
 249     {
 250         char name[32];
 251         snprintf(name, sizeof(name), "%s/enable", layout);
 252         if(!GetConfigValueBool("layouts", name, 0))
 253             return false;
 254     }
 255
 256     for(i = 0;i < count;i++)
 257     {
 258         const char *channame;
 259         char chanlayout[32];
 260         const char *value;
 261         int props;
 262
 263         chanmap[i].ChanName = channels[i];
 264         channame = GetLabelFromChannel(channels[i]);
 265
 266         snprintf(chanlayout, sizeof(chanlayout), "%s/%s", layout, channame);
 267         if(!ConfigValueStr("layouts", chanlayout, &value))
 268         {
 269             ERR("Missing channel %s\n", channame);
 270             return false;
 271         }
 272         props = sscanf(value, " %f %f %f %f %f %f %f %f %f %f %f %f %f %f %f %f ; %f %f %f %f",
 273             &chanmap[i].Config.HOACoeff[0], &chanmap[i].Config.HOACoeff[1], &chanmap[i].Config.HOACoeff[2],
 274             &chanmap[i].Config.HOACoeff[3], &chanmap[i].Config.HOACoeff[4], &chanmap[i].Config.HOACoeff[5],
 275             &chanmap[i].Config.HOACoeff[6], &chanmap[i].Config.HOACoeff[7], &chanmap[i].Config.HOACoeff[8],
 276             &chanmap[i].Config.HOACoeff[9], &chanmap[i].Config.HOACoeff[10], &chanmap[i].Config.HOACoeff[11],
 277             &chanmap[i].Config.HOACoeff[12], &chanmap[i].Config.HOACoeff[13], &chanmap[i].Config.HOACoeff[14],
 278             &chanmap[i].Config.HOACoeff[15], &chanmap[i].Config.FOACoeff[0], &chanmap[i].Config.FOACoeff[1],
 279             &chanmap[i].Config.FOACoeff[2], &chanmap[i].Config.FOACoeff[3]);
 280         if(props == 0)
 281         {
 282             ERR("Failed to parse %s channel's properties\n", channame);
 283             return false;
 284         }
 285
 286         if(props < 20)
 287         {
 288             ERR("Failed to parse %s channel's elements (expected 20, got %d)\n", channame, props);
 289             return false;
 290         }
 291     }
 292     SetChannelMap(device, chanmap, count);
 293     return true;
 294 }
 295
 296 ALvoid aluInitPanning(ALCdevice *device)
 297 {
 298     static const ChannelMap MonoCfg[1] = {
 299         { FrontCenter, { { 1.4142f }, { 1.4142f } } },
 300     }, StereoCfg[2] = {
 301         { FrontLeft,   { { 0.7071f, 0.0f,  0.5f, 0.0f }, { 0.7071f, 0.0f,  0.5f, 0.0f } } },
 302         { FrontRight,  { { 0.7071f, 0.0f, -0.5f, 0.0f }, { 0.7071f, 0.0f, -0.5f, 0.0f } } },
 303     }, QuadCfg[4] = {
 304         { 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  } } },
 305         { 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  } } },
 306         { 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  } } },
 307         { 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  } } },
 308     }, X51SideCfg[5] = {
 309         { 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 } } },
 310         { 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 } } },
 311         { 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 } } },
 312         { 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 } } },
 313         { 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 } } },
 314     }, X51RearCfg[5] = {
 315         { 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 } } },
 316         { 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 } } },
 317         { 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 } } },
 318         { 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 } } },
 319         { 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 } } },
 320     }, X61Cfg[6] = {
 321         { 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 } } },
 322         { 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 } } },
 323         { 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 } } },
 324         { 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 } } },
 325         { 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 } } },
 326         { 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 } } },
 327     }, X71Cfg[7] = {
 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,  0.000000f }, { 0.109403f,  0.137375f,  0.000000f, 0.0f } } },
 331         { 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 } } },
 332         { 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 } } },
 333         { 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 } } },
 334         { 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 } } },
 335     }, Cube8[8] = {
 336         { TopFrontLeft,     { { 0.353553f,  0.250000f,  0.250000f,  0.250000f }, { 0.353553f,  0.250000f,  0.250000f,  0.250000f } } },
 337         { TopFrontRight,    { { 0.353553f,  0.250000f, -0.250000f,  0.250000f }, { 0.353553f,  0.250000f, -0.250000f,  0.250000f } } },
 338         { TopBackLeft,      { { 0.353553f, -0.250000f,  0.250000f,  0.250000f }, { 0.353553f, -0.250000f,  0.250000f,  0.250000f } } },
 339         { TopBackRight,     { { 0.353553f, -0.250000f, -0.250000f,  0.250000f }, { 0.353553f, -0.250000f, -0.250000f,  0.250000f } } },
 340         { BottomFrontLeft,  { { 0.353553f,  0.250000f,  0.250000f, -0.250000f }, { 0.353553f,  0.250000f,  0.250000f, -0.250000f } } },
 341         { BottomFrontRight, { { 0.353553f,  0.250000f, -0.250000f, -0.250000f }, { 0.353553f,  0.250000f, -0.250000f, -0.250000f } } },
 342         { BottomBackLeft,   { { 0.353553f, -0.250000f,  0.250000f, -0.250000f }, { 0.353553f, -0.250000f,  0.250000f, -0.250000f } } },
 343         { BottomBackRight,  { { 0.353553f, -0.250000f, -0.250000f, -0.250000f }, { 0.353553f, -0.250000f, -0.250000f, -0.250000f } } },
 344     };
 345     const ChannelMap *chanmap = NULL;
 346     size_t count = 0;
 347
 348     memset(device->Channel, 0, sizeof(device->Channel));
 349     device->NumChannels = 0;
 350
 351     if(device->Hrtf)
 352     {
 353         static const struct {
 354             enum Channel channel;
 355             ALfloat elevation;
 356             ALfloat angle;
 357         } VirtualChans[8] = {
 358             { TopFrontLeft,     DEG2RAD( 45.0f), DEG2RAD( -45.0f) },
 359             { TopFrontRight,    DEG2RAD( 45.0f), DEG2RAD(  45.0f) },
 360             { TopBackLeft,      DEG2RAD( 45.0f), DEG2RAD(-135.0f) },
 361             { TopBackRight,     DEG2RAD( 45.0f), DEG2RAD( 135.0f) },
 362             { BottomFrontLeft,  DEG2RAD(-45.0f), DEG2RAD( -45.0f) },
 363             { BottomFrontRight, DEG2RAD(-45.0f), DEG2RAD(  45.0f) },
 364             { BottomBackLeft,   DEG2RAD(-45.0f), DEG2RAD(-135.0f) },
 365             { BottomBackRight,  DEG2RAD(-45.0f), DEG2RAD( 135.0f) },
 366         };
 367         ALuint i;
 368
 369         count = COUNTOF(Cube8);
 370         chanmap = Cube8;
 371
 372         for(i = 0;i < count;i++)
 373             device->ChannelName[i] = VirtualChans[i].channel;
 374         SetChannelMap(device, chanmap, count);
 375         for(i = 0;i < count;i++)
 376             GetLerpedHrtfCoeffs(
 377                 device->Hrtf, VirtualChans[i].elevation, VirtualChans[i].angle, 1.0f, 1.0f,
 378                 device->Hrtf_Params[i].Coeffs, device->Hrtf_Params[i].Delay
 379             );
 380
 381         return;
 382     }
 383
 384     if(LoadChannelSetup(device))
 385         return;
 386
 387     switch(device->FmtChans)
 388     {
 389         case DevFmtMono:
 390             count = COUNTOF(MonoCfg);
 391             chanmap = MonoCfg;
 392             break;
 393
 394         case DevFmtStereo:
 395             count = COUNTOF(StereoCfg);
 396             chanmap = StereoCfg;
 397             break;
 398
 399         case DevFmtQuad:
 400             count = COUNTOF(QuadCfg);
 401             chanmap = QuadCfg;
 402             break;
 403
 404         case DevFmtX51:
 405             count = COUNTOF(X51SideCfg);
 406             chanmap = X51SideCfg;
 407             break;
 408
 409         case DevFmtX51Rear:
 410             count = COUNTOF(X51RearCfg);
 411             chanmap = X51RearCfg;
 412             break;
 413
 414         case DevFmtX61:
 415             count = COUNTOF(X61Cfg);
 416             chanmap = X61Cfg;
 417             break;
 418
 419         case DevFmtX71:
 420             count = COUNTOF(X71Cfg);
 421             chanmap = X71Cfg;
 422             break;
 423     }
 424
 425     SetChannelMap(device, chanmap, count);
 426 }