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 TopCenter: return "top-center";
 129         case BottomCenter: return "bottom-center";
 130         case TopFrontLeft: return "top-front-left";
 131         case TopFrontRight: return "top-front-right";
 132         case TopBackLeft: return "top-back-left";
 133         case TopBackRight: return "top-back-right";
 134         case BottomFrontLeft: return "bottom-front-left";
 135         case BottomFrontRight: return "bottom-front-right";
 136         case BottomBackLeft: return "bottom-back-left";
 137         case BottomBackRight: return "bottom-back-right";
 138
 139         case InvalidChannel: break;
 140     }
 141     return "(unknown)";
 142 }
 143
 144
 145 typedef struct ChannelMap {
 146     enum Channel ChanName;
 147     ChannelConfig Config;
 148 } ChannelMap;
 149
 150 static void SetChannelMap(ALCdevice *device, const ChannelMap *chanmap, size_t count)
 151 {
 152     size_t i, j;
 153
 154     for(i = 0;i < MAX_OUTPUT_CHANNELS && device->ChannelName[i] != InvalidChannel;i++)
 155     {
 156         if(device->ChannelName[i] == LFE)
 157         {
 158             for(j = 0;j < MAX_AMBI_COEFFS;j++)
 159                 device->Channel[i].HOACoeff[j] = 0.0f;
 160             for(j = 0;j < 4;j++)
 161                 device->Channel[i].FOACoeff[j] = 0.0f;
 162             continue;
 163         }
 164
 165         for(j = 0;j < count;j++)
 166         {
 167             if(device->ChannelName[i] == chanmap[j].ChanName)
 168             {
 169                 device->Channel[i] = chanmap[j].Config;
 170                 break;
 171             }
 172         }
 173         if(j == count)
 174             ERR("Failed to match %s channel ("SZFMT") in config\n", GetLabelFromChannel(device->ChannelName[i]), i);
 175     }
 176     device->NumChannels = i;
 177 }
 178
 179 static bool LoadChannelSetup(ALCdevice *device)
 180 {
 181     static const enum Channel mono_chans[1] = {
 182         FrontCenter
 183     }, stereo_chans[2] = {
 184         FrontLeft, FrontRight
 185     }, quad_chans[4] = {
 186         FrontLeft, FrontRight,
 187         BackLeft, BackRight
 188     }, surround51_chans[5] = {
 189         FrontLeft, FrontRight, FrontCenter,
 190         SideLeft, SideRight
 191     }, surround51rear_chans[5] = {
 192         FrontLeft, FrontRight, FrontCenter,
 193         BackLeft, BackRight
 194     }, surround61_chans[6] = {
 195         FrontLeft, FrontRight,
 196         FrontCenter, BackCenter,
 197         SideLeft, SideRight
 198     }, surround71_chans[7] = {
 199         FrontLeft, FrontRight, FrontCenter,
 200         BackLeft, BackRight,
 201         SideLeft, SideRight
 202     };
 203     ChannelMap chanmap[MAX_OUTPUT_CHANNELS];
 204     const enum Channel *channels = NULL;
 205     const char *layout = NULL;
 206     size_t count = 0;
 207     size_t i;
 208
 209     switch(device->FmtChans)
 210     {
 211         case DevFmtMono:
 212             layout = "mono";
 213             channels = mono_chans;
 214             count = COUNTOF(mono_chans);
 215             break;
 216         case DevFmtStereo:
 217             layout = "stereo";
 218             channels = stereo_chans;
 219             count = COUNTOF(stereo_chans);
 220             break;
 221         case DevFmtQuad:
 222             layout = "quad";
 223             channels = quad_chans;
 224             count = COUNTOF(quad_chans);
 225             break;
 226         case DevFmtX51:
 227             layout = "surround51";
 228             channels = surround51_chans;
 229             count = COUNTOF(surround51_chans);
 230             break;
 231         case DevFmtX51Rear:
 232             layout = "surround51rear";
 233             channels = surround51rear_chans;
 234             count = COUNTOF(surround51rear_chans);
 235             break;
 236         case DevFmtX61:
 237             layout = "surround61";
 238             channels = surround61_chans;
 239             count = COUNTOF(surround61_chans);
 240             break;
 241         case DevFmtX71:
 242             layout = "surround71";
 243             channels = surround71_chans;
 244             count = COUNTOF(surround71_chans);
 245             break;
 246     }
 247
 248     if(!layout)
 249         return false;
 250     else
 251     {
 252         char name[32];
 253         snprintf(name, sizeof(name), "%s/enable", layout);
 254         if(!GetConfigValueBool("layouts", name, 0))
 255             return false;
 256     }
 257
 258     for(i = 0;i < count;i++)
 259     {
 260         const char *channame;
 261         char chanlayout[32];
 262         const char *value;
 263         int props;
 264
 265         chanmap[i].ChanName = channels[i];
 266         channame = GetLabelFromChannel(channels[i]);
 267
 268         snprintf(chanlayout, sizeof(chanlayout), "%s/%s", layout, channame);
 269         if(!ConfigValueStr("layouts", chanlayout, &value))
 270         {
 271             ERR("Missing channel %s\n", channame);
 272             return false;
 273         }
 274         props = sscanf(value, " %f %f %f %f %f %f %f %f %f %f %f %f %f %f %f %f ; %f %f %f %f",
 275             &chanmap[i].Config.HOACoeff[0], &chanmap[i].Config.HOACoeff[1], &chanmap[i].Config.HOACoeff[2],
 276             &chanmap[i].Config.HOACoeff[3], &chanmap[i].Config.HOACoeff[4], &chanmap[i].Config.HOACoeff[5],
 277             &chanmap[i].Config.HOACoeff[6], &chanmap[i].Config.HOACoeff[7], &chanmap[i].Config.HOACoeff[8],
 278             &chanmap[i].Config.HOACoeff[9], &chanmap[i].Config.HOACoeff[10], &chanmap[i].Config.HOACoeff[11],
 279             &chanmap[i].Config.HOACoeff[12], &chanmap[i].Config.HOACoeff[13], &chanmap[i].Config.HOACoeff[14],
 280             &chanmap[i].Config.HOACoeff[15], &chanmap[i].Config.FOACoeff[0], &chanmap[i].Config.FOACoeff[1],
 281             &chanmap[i].Config.FOACoeff[2], &chanmap[i].Config.FOACoeff[3]);
 282         if(props == 0)
 283         {
 284             ERR("Failed to parse %s channel's properties\n", channame);
 285             return false;
 286         }
 287
 288         if(props < 20)
 289         {
 290             ERR("Failed to parse %s channel's elements (expected 20, got %d)\n", channame, props);
 291             return false;
 292         }
 293     }
 294     SetChannelMap(device, chanmap, count);
 295     return true;
 296 }
 297
 298 ALvoid aluInitPanning(ALCdevice *device)
 299 {
 300     static const ChannelMap MonoCfg[1] = {
 301         { FrontCenter, { { 1.4142f }, { 1.4142f } } },
 302     }, StereoCfg[2] = {
 303         { FrontLeft,   { { 0.7071f, 0.0f,  0.5f, 0.0f }, { 0.7071f, 0.0f,  0.5f, 0.0f } } },
 304         { FrontRight,  { { 0.7071f, 0.0f, -0.5f, 0.0f }, { 0.7071f, 0.0f, -0.5f, 0.0f } } },
 305     }, QuadCfg[4] = {
 306         { 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  } } },
 307         { 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  } } },
 308         { 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  } } },
 309         { 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  } } },
 310     }, X51SideCfg[5] = {
 311         { 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 } } },
 312         { 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 } } },
 313         { 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 } } },
 314         { 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 } } },
 315         { 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 } } },
 316     }, X51RearCfg[5] = {
 317         { 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 } } },
 318         { 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 } } },
 319         { 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 } } },
 320         { 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 } } },
 321         { 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 } } },
 322     }, X61Cfg[6] = {
 323         { 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 } } },
 324         { 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 } } },
 325         { 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 } } },
 326         { 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 } } },
 327         { 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 } } },
 328         { 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 } } },
 329     }, X71Cfg[7] = {
 330         { 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 } } },
 331         { 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 } } },
 332         { 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 } } },
 333         { 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 } } },
 334         { 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 } } },
 335         { 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 } } },
 336         { 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 } } },
 337     }, CubeDiamond[14] = {
 338         { SideLeft,         { { 0.130137f, -0.000013f,  0.207620f,  0.000001f, -0.081895f,  0.000001f,  0.000002f, -0.144357f, -0.000015f, -0.000002f,  0.000001f, -0.032339f, -0.000000f,  0.000001f,  0.000005f, -0.057583f }, { 0.130137f, -0.000009f,  0.139199f,  0.000001f } } },
 339         { FrontCenter,      { { 0.130131f,  0.207613f, -0.000007f,  0.000001f, -0.081898f,  0.000001f, -0.000000f,  0.144354f, -0.000010f, -0.000002f, -0.032343f,  0.000006f, -0.000000f, -0.000001f,  0.057583f, -0.000004f }, { 0.130131f,  0.139195f, -0.000005f,  0.000001f } } },
 340         { SideRight,        { { 0.130140f,  0.000001f, -0.207624f, -0.000001f, -0.081900f,  0.000005f,  0.000001f, -0.144357f, -0.000002f,  0.000002f, -0.000004f,  0.032342f, -0.000000f, -0.000005f, -0.000002f,  0.057580f }, { 0.130140f,  0.000000f, -0.139202f, -0.000000f } } },
 341         { BackCenter,       { { 0.130142f, -0.207624f,  0.000006f, -0.000010f, -0.081897f,  0.000011f,  0.000005f,  0.144354f, -0.000006f,  0.000004f,  0.032340f,  0.000000f, -0.000002f, -0.000005f, -0.057579f,  0.000003f }, { 0.130142f, -0.139202f,  0.000004f, -0.000007f } } },
 342         { TopCenter,        { { 0.072579f,  0.000006f,  0.000001f,  0.123524f,  0.126630f,  0.000008f,  0.000001f, -0.000002f,  0.000001f,  0.070290f,  0.000005f,  0.000001f, -0.000002f,  0.000001f, -0.000001f,  0.000002f }, { 0.072579f,  0.000004f,  0.000001f,  0.082817f } } },
 343         { BottomCenter,     { { 0.072577f, -0.000008f, -0.000004f, -0.123522f,  0.126628f,  0.000012f,  0.000005f, -0.000001f,  0.000002f, -0.070291f, -0.000008f, -0.000002f,  0.000001f, -0.000002f,  0.000000f, -0.000001f }, { 0.072577f, -0.000006f, -0.000003f, -0.082815f } } },
 344         { TopFrontLeft,     { { 0.176238f,  0.156939f,  0.156950f,  0.149964f,  0.006362f,  0.101960f,  0.101968f, -0.000003f,  0.117690f, -0.020696f,  0.018718f,  0.018723f,  0.000002f,  0.038069f, -0.025485f,  0.025484f }, { 0.176238f,  0.105220f,  0.105227f,  0.100544f } } },
 345         { TopFrontRight,    { { 0.176240f,  0.156940f, -0.156956f,  0.149960f,  0.006356f,  0.101955f, -0.101970f, -0.000007f, -0.117691f, -0.020700f,  0.018719f, -0.018722f, -0.000003f, -0.038066f, -0.025485f, -0.025485f }, { 0.176240f,  0.105220f, -0.105231f,  0.100541f } } },
 346         { TopBackLeft,      { { 0.176245f, -0.156957f,  0.156942f,  0.149971f,  0.006355f, -0.101977f,  0.101961f,  0.000003f, -0.117684f, -0.020701f, -0.018724f,  0.018716f,  0.000001f, -0.038069f,  0.025482f,  0.025479f }, { 0.176245f, -0.105232f,  0.105222f,  0.100548f } } },
 347         { TopBackRight,     { { 0.176238f, -0.156944f, -0.156942f,  0.149972f,  0.006363f, -0.101976f, -0.101964f, -0.000005f,  0.117687f, -0.020701f, -0.018726f, -0.018716f,  0.000000f,  0.038072f,  0.025486f, -0.025481f }, { 0.176238f, -0.105224f, -0.105222f,  0.100549f } } },
 348         { BottomFrontLeft,  { { 0.176248f,  0.156943f,  0.156950f, -0.149981f,  0.006371f, -0.101969f, -0.101967f, -0.000008f,  0.117685f,  0.020695f,  0.018723f,  0.018718f,  0.000000f, -0.038067f, -0.025486f,  0.025479f }, { 0.176248f,  0.105223f,  0.105227f, -0.100555f } } },
 349         { BottomFrontRight, { { 0.176236f,  0.156947f, -0.156945f, -0.149961f,  0.006353f, -0.101971f,  0.101964f, -0.000002f, -0.117689f,  0.020704f,  0.018723f, -0.018718f, -0.000001f,  0.038071f, -0.025484f, -0.025482f }, { 0.176236f,  0.105225f, -0.105224f, -0.100542f } } },
 350         { BottomBackLeft,   { { 0.176236f, -0.156936f,  0.156952f, -0.149964f,  0.006358f,  0.101962f, -0.101976f, -0.000005f, -0.117687f,  0.020707f, -0.018720f,  0.018725f,  0.000001f,  0.038071f,  0.025483f,  0.025485f }, { 0.176236f, -0.105218f,  0.105229f, -0.100543f } } },
 351         { BottomBackRight,  { { 0.176256f, -0.156956f, -0.156954f, -0.149974f,  0.006366f,  0.101960f,  0.101964f,  0.000003f,  0.117692f,  0.020690f, -0.018718f, -0.018722f,  0.000001f, -0.038064f,  0.025483f, -0.025484f }, { 0.176256f, -0.105232f, -0.105230f, -0.100550f } } },
 352     };
 353     const ChannelMap *chanmap = NULL;
 354     size_t count = 0;
 355
 356     memset(device->Channel, 0, sizeof(device->Channel));
 357     device->NumChannels = 0;
 358
 359     if(device->Hrtf)
 360     {
 361         static const struct {
 362             enum Channel channel;
 363             ALfloat elevation;
 364             ALfloat angle;
 365         } VirtualChans[14] = {
 366             { FrontCenter,      DEG2RAD(  0.0f), DEG2RAD(   0.0f) },
 367             { BackCenter,       DEG2RAD(  0.0f), DEG2RAD(-180.0f) },
 368             { SideLeft,         DEG2RAD(  0.0f), DEG2RAD( -90.0f) },
 369             { SideRight,        DEG2RAD(  0.0f), DEG2RAD(  90.0f) },
 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             { TopCenter,        DEG2RAD( 90.0f), DEG2RAD(   0.0f) },
 379             { BottomCenter,     DEG2RAD(-90.0f), DEG2RAD(   0.0f) },
 380         };
 381         ALuint i;
 382
 383         count = COUNTOF(CubeDiamond);
 384         chanmap = CubeDiamond;
 385
 386         for(i = 0;i < count;i++)
 387             device->ChannelName[i] = VirtualChans[i].channel;
 388         SetChannelMap(device, chanmap, count);
 389         for(i = 0;i < count;i++)
 390             GetLerpedHrtfCoeffs(device->Hrtf, VirtualChans[i].elevation, VirtualChans[i].angle,
 391                                 device->Hrtf_Params[i].Coeffs, device->Hrtf_Params[i].Delay);
 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
 437     SetChannelMap(device, chanmap, count);
 438 }