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 #define ZERO_ORDER_SCALE    0.0f
  37 #define FIRST_ORDER_SCALE   1.0f
  38 #define SECOND_ORDER_SCALE  (1.0f / 1.22474f)
  39 #define THIRD_ORDER_SCALE   (1.0f / 1.30657f)
  40
  41
  42 static const ALuint FuMa2ACN[MAX_AMBI_COEFFS] = {
  43     0,  /* W */
  44     3,  /* X */
  45     1,  /* Y */
  46     2,  /* Z */
  47     6,  /* R */
  48     7,  /* S */
  49     5,  /* T */
  50     8,  /* U */
  51     4,  /* V */
  52     12, /* K */
  53     13, /* L */
  54     11, /* M */
  55     14, /* N */
  56     10, /* O */
  57     15, /* P */
  58     9,  /* Q */
  59 };
  60
  61 /* NOTE: These are scale factors as applied to Ambisonics content. FuMa
  62  * decoder coefficients should be divided by these values to get N3D decoder
  63  * coefficients.
  64  */
  65 static const ALfloat FuMa2N3DScale[MAX_AMBI_COEFFS] = {
  66     1.4142f, /* ACN  0 (W), sqrt(2) */
  67     1.7321f, /* ACN  1 (Y), sqrt(3) */
  68     1.7321f, /* ACN  2 (Z), sqrt(3) */
  69     1.7321f, /* ACN  3 (X), sqrt(3) */
  70     1.9365f, /* ACN  4 (V), sqrt(15)/2 */
  71     1.9365f, /* ACN  5 (T), sqrt(15)/2 */
  72     2.2361f, /* ACN  6 (R), sqrt(5) */
  73     1.9365f, /* ACN  7 (S), sqrt(15)/2 */
  74     1.9365f, /* ACN  8 (U), sqrt(15)/2 */
  75     2.0917f, /* ACN  9 (Q), sqrt(35/8) */
  76     1.9720f, /* ACN 10 (O), sqrt(35)/3 */
  77     2.2311f, /* ACN 11 (M), sqrt(224/45) */
  78     2.6458f, /* ACN 12 (K), sqrt(7) */
  79     2.2311f, /* ACN 13 (L), sqrt(224/45) */
  80     1.9720f, /* ACN 14 (N), sqrt(35)/3 */
  81     2.0917f, /* ACN 15 (P), sqrt(35/8) */
  82 };
  83
  84
  85 void ComputeAmbientGains(const ALCdevice *device, ALfloat ingain, ALfloat gains[MAX_OUTPUT_CHANNELS])
  86 {
  87     ALuint i;
  88
  89     for(i = 0;i < device->NumChannels;i++)
  90     {
  91         // The W coefficients are based on a mathematical average of the
  92         // output. The square root of the base average provides for a more
  93         // perceptual average volume, better suited to non-directional gains.
  94         gains[i] = sqrtf(device->AmbiCoeffs[i][0]) * ingain;
  95     }
  96     for(;i < MAX_OUTPUT_CHANNELS;i++)
  97         gains[i] = 0.0f;
  98 }
  99
 100 void ComputeAngleGains(const ALCdevice *device, ALfloat angle, ALfloat elevation, ALfloat ingain, ALfloat gains[MAX_OUTPUT_CHANNELS])
 101 {
 102     ALfloat dir[3] = {
 103         sinf(angle) * cosf(elevation),
 104         sinf(elevation),
 105         -cosf(angle) * cosf(elevation)
 106     };
 107     ComputeDirectionalGains(device, dir, ingain, gains);
 108 }
 109
 110 void ComputeDirectionalGains(const ALCdevice *device, const ALfloat dir[3], ALfloat ingain, ALfloat gains[MAX_OUTPUT_CHANNELS])
 111 {
 112     ALfloat coeffs[MAX_AMBI_COEFFS];
 113     ALuint i, j;
 114     /* Convert from OpenAL coords to Ambisonics. */
 115     ALfloat x = -dir[2];
 116     ALfloat y = -dir[0];
 117     ALfloat z =  dir[1];
 118
 119     /* Zeroth-order */
 120     coeffs[0]  = 1.0f; /* ACN 0 = 1 */
 121     /* First-order */
 122     coeffs[1]  = 1.7321f * y; /* ACN 1 = sqrt(3) * Y */
 123     coeffs[2]  = 1.7321f * z; /* ACN 2 = sqrt(3) * Z */
 124     coeffs[3]  = 1.7321f * x; /* ACN 3 = sqrt(3) * X */
 125     /* Second-order */
 126     coeffs[4]  = 3.8730f * x * y;             /* ACN 4 = sqrt(15) * X * Y */
 127     coeffs[5]  = 3.8730f * y * z;             /* ACN 5 = sqrt(15) * Y * Z */
 128     coeffs[6]  = 1.1180f * (3.0f*z*z - 1.0f); /* ACN 6 = sqrt(5)/2 * (3*Z*Z - 1) */
 129     coeffs[7]  = 3.8730f * x * z;             /* ACN 7 = sqrt(15) * X * Z */
 130     coeffs[8]  = 1.9365f * (x*x - y*y);       /* ACN 8 = sqrt(15)/2 * (X*X - Y*Y) */
 131     /* Third-order */
 132     coeffs[9]  =  2.0917f * y * (3.0f*x*x - y*y);  /* ACN  9 = sqrt(35/8) * Y * (3*X*X - Y*Y) */
 133     coeffs[10] = 10.2470f * z * x * y;             /* ACN 10 = sqrt(105) * Z * X * Y */
 134     coeffs[11] =  1.6292f * y * (5.0f*z*z - 1.0f); /* ACN 11 = sqrt(21/8) * Y * (5*Z*Z - 1) */
 135     coeffs[12] =  1.3229f * z * (5.0f*z*z - 3.0f); /* ACN 12 = sqrt(7)/2 * Z * (5*Z*Z - 3) */
 136     coeffs[13] =  1.6292f * x * (5.0f*z*z - 1.0f); /* ACN 13 = sqrt(21/8) * X * (5*Z*Z - 1) */
 137     coeffs[14] =  5.1235f * z * (x*x - y*y);       /* ACN 14 = sqrt(105)/2 * Z * (X*X - Y*Y) */
 138     coeffs[15] =  2.0917f * x * (x*x - 3.0f*y*y);  /* ACN 15 = sqrt(35/8) * X * (X*X - 3*Y*Y) */
 139
 140     for(i = 0;i < device->NumChannels;i++)
 141     {
 142         float gain = 0.0f;
 143         for(j = 0;j < MAX_AMBI_COEFFS;j++)
 144             gain += device->AmbiCoeffs[i][j]*coeffs[j];
 145         gains[i] = gain * ingain;
 146     }
 147     for(;i < MAX_OUTPUT_CHANNELS;i++)
 148         gains[i] = 0.0f;
 149 }
 150
 151 void ComputeBFormatGains(const ALCdevice *device, const ALfloat mtx[4], ALfloat ingain, ALfloat gains[MAX_OUTPUT_CHANNELS])
 152 {
 153     ALuint i, j;
 154
 155     for(i = 0;i < device->NumChannels;i++)
 156     {
 157         float gain = 0.0f;
 158         for(j = 0;j < 4;j++)
 159             gain += device->AmbiCoeffs[i][j] * mtx[j];
 160         gains[i] = gain * ingain;
 161     }
 162     for(;i < MAX_OUTPUT_CHANNELS;i++)
 163         gains[i] = 0.0f;
 164 }
 165
 166
 167 DECL_CONST static inline const char *GetLabelFromChannel(enum Channel channel)
 168 {
 169     switch(channel)
 170     {
 171         case FrontLeft: return "front-left";
 172         case FrontRight: return "front-right";
 173         case FrontCenter: return "front-center";
 174         case LFE: return "lfe";
 175         case BackLeft: return "back-left";
 176         case BackRight: return "back-right";
 177         case BackCenter: return "back-center";
 178         case SideLeft: return "side-left";
 179         case SideRight: return "side-right";
 180
 181         case TopFrontLeft: return "top-front-left";
 182         case TopFrontRight: return "top-front-right";
 183         case TopBackLeft: return "top-back-left";
 184         case TopBackRight: return "top-back-right";
 185         case BottomFrontLeft: return "bottom-front-left";
 186         case BottomFrontRight: return "bottom-front-right";
 187         case BottomBackLeft: return "bottom-back-left";
 188         case BottomBackRight: return "bottom-back-right";
 189
 190         case BFormatW: return "bformat-w";
 191         case BFormatX: return "bformat-x";
 192         case BFormatY: return "bformat-y";
 193         case BFormatZ: return "bformat-z";
 194
 195         case InvalidChannel: break;
 196     }
 197     return "(unknown)";
 198 }
 199
 200
 201 typedef struct ChannelMap {
 202     enum Channel ChanName;
 203     ChannelConfig Config;
 204 } ChannelMap;
 205
 206 static void SetChannelMap(ALCdevice *device, const ChannelMap *chanmap, size_t count, ALfloat ambiscale, ALboolean isfuma)
 207 {
 208     size_t i, j, k;
 209
 210     device->AmbiScale = ambiscale;
 211     for(i = 0;i < MAX_OUTPUT_CHANNELS && device->ChannelName[i] != InvalidChannel;i++)
 212     {
 213         if(device->ChannelName[i] == LFE)
 214         {
 215             for(j = 0;j < MAX_AMBI_COEFFS;j++)
 216                 device->AmbiCoeffs[i][j] = 0.0f;
 217             continue;
 218         }
 219
 220         for(j = 0;j < count;j++)
 221         {
 222             if(device->ChannelName[i] == chanmap[j].ChanName)
 223             {
 224                 if(isfuma)
 225                 {
 226                     /* Reformat FuMa -> ACN/N3D */
 227                     for(k = 0;k < MAX_AMBI_COEFFS;++k)
 228                     {
 229                         ALuint acn = FuMa2ACN[k];
 230                         device->AmbiCoeffs[i][acn] = chanmap[j].Config[k] / FuMa2N3DScale[acn];
 231                     }
 232                 }
 233                 else
 234                 {
 235                     for(k = 0;k < MAX_AMBI_COEFFS;++k)
 236                         device->AmbiCoeffs[i][k] = chanmap[j].Config[k];
 237                 }
 238                 break;
 239             }
 240         }
 241         if(j == count)
 242             ERR("Failed to match %s channel ("SZFMT") in config\n", GetLabelFromChannel(device->ChannelName[i]), i);
 243     }
 244     device->NumChannels = i;
 245 }
 246
 247 static bool LoadChannelSetup(ALCdevice *device)
 248 {
 249     static const enum Channel mono_chans[1] = {
 250         FrontCenter
 251     }, stereo_chans[2] = {
 252         FrontLeft, FrontRight
 253     }, quad_chans[4] = {
 254         FrontLeft, FrontRight,
 255         BackLeft, BackRight
 256     }, surround51_chans[5] = {
 257         FrontLeft, FrontRight, FrontCenter,
 258         SideLeft, SideRight
 259     }, surround51rear_chans[5] = {
 260         FrontLeft, FrontRight, FrontCenter,
 261         BackLeft, BackRight
 262     }, surround61_chans[6] = {
 263         FrontLeft, FrontRight,
 264         FrontCenter, BackCenter,
 265         SideLeft, SideRight
 266     }, surround71_chans[7] = {
 267         FrontLeft, FrontRight, FrontCenter,
 268         BackLeft, BackRight,
 269         SideLeft, SideRight
 270     };
 271     ChannelMap chanmap[MAX_OUTPUT_CHANNELS];
 272     const enum Channel *channels = NULL;
 273     const char *layout = NULL;
 274     ALfloat ambiscale = 1.0f;
 275     size_t count = 0;
 276     int isfuma;
 277     int order;
 278     size_t i;
 279
 280     switch(device->FmtChans)
 281     {
 282         case DevFmtMono:
 283             layout = "mono";
 284             channels = mono_chans;
 285             count = COUNTOF(mono_chans);
 286             break;
 287         case DevFmtStereo:
 288             layout = "stereo";
 289             channels = stereo_chans;
 290             count = COUNTOF(stereo_chans);
 291             break;
 292         case DevFmtQuad:
 293             layout = "quad";
 294             channels = quad_chans;
 295             count = COUNTOF(quad_chans);
 296             break;
 297         case DevFmtX51:
 298             layout = "surround51";
 299             channels = surround51_chans;
 300             count = COUNTOF(surround51_chans);
 301             break;
 302         case DevFmtX51Rear:
 303             layout = "surround51rear";
 304             channels = surround51rear_chans;
 305             count = COUNTOF(surround51rear_chans);
 306             break;
 307         case DevFmtX61:
 308             layout = "surround61";
 309             channels = surround61_chans;
 310             count = COUNTOF(surround61_chans);
 311             break;
 312         case DevFmtX71:
 313             layout = "surround71";
 314             channels = surround71_chans;
 315             count = COUNTOF(surround71_chans);
 316             break;
 317         case DevFmtBFormat3D:
 318             break;
 319     }
 320
 321     if(!layout)
 322         return false;
 323     else
 324     {
 325         char name[32] = {0};
 326         const char *type;
 327         char eol;
 328
 329         snprintf(name, sizeof(name), "%s/type", layout);
 330         if(!ConfigValueStr(al_string_get_cstr(device->DeviceName), "layouts", name, &type))
 331             return false;
 332
 333         if(sscanf(type, " %31[^: ] : %d%c", name, &order, &eol) != 2)
 334         {
 335             ERR("Invalid type value '%s' (expected name:order) for layout %s\n", type, layout);
 336             return false;
 337         }
 338
 339         if(strcasecmp(name, "fuma") == 0)
 340             isfuma = 1;
 341         else if(strcasecmp(name, "n3d") == 0)
 342             isfuma = 0;
 343         else
 344         {
 345             ERR("Unhandled type name '%s' (expected FuMa or N3D) for layout %s\n", name, layout);
 346             return false;
 347         }
 348
 349         if(order == 3)
 350             ambiscale = THIRD_ORDER_SCALE;
 351         else if(order == 2)
 352             ambiscale = SECOND_ORDER_SCALE;
 353         else if(order == 1)
 354             ambiscale = FIRST_ORDER_SCALE;
 355         else if(order == 0)
 356             ambiscale = ZERO_ORDER_SCALE;
 357         else
 358         {
 359             ERR("Unhandled type order %d (expected 0, 1, 2, or 3) for layout %s\n", order, layout);
 360             return false;
 361         }
 362     }
 363
 364     for(i = 0;i < count;i++)
 365     {
 366         float coeffs[MAX_AMBI_COEFFS] = {0.0f};
 367         const char *channame;
 368         char chanlayout[32];
 369         const char *value;
 370         int props = 0;
 371         char eol = 0;
 372         int j;
 373
 374         chanmap[i].ChanName = channels[i];
 375         channame = GetLabelFromChannel(channels[i]);
 376
 377         snprintf(chanlayout, sizeof(chanlayout), "%s/%s", layout, channame);
 378         if(!ConfigValueStr(al_string_get_cstr(device->DeviceName), "layouts", chanlayout, &value))
 379         {
 380             ERR("Missing channel %s\n", channame);
 381             return false;
 382         }
 383         if(order == 3)
 384             props = sscanf(value, " %f %f %f %f %f %f %f %f %f %f %f %f %f %f %f %f %c",
 385                 &coeffs[0],  &coeffs[1],  &coeffs[2],  &coeffs[3],
 386                 &coeffs[4],  &coeffs[5],  &coeffs[6],  &coeffs[7],
 387                 &coeffs[8],  &coeffs[9],  &coeffs[10], &coeffs[11],
 388                 &coeffs[12], &coeffs[13], &coeffs[14], &coeffs[15],
 389                 &eol
 390             );
 391         else if(order == 2)
 392             props = sscanf(value, " %f %f %f %f %f %f %f %f %f %c",
 393                 &coeffs[0], &coeffs[1], &coeffs[2],
 394                 &coeffs[3], &coeffs[4], &coeffs[5],
 395                 &coeffs[6], &coeffs[7], &coeffs[8],
 396                 &eol
 397             );
 398         else if(order == 1)
 399             props = sscanf(value, " %f %f %f %f %c",
 400                 &coeffs[0], &coeffs[1],
 401                 &coeffs[2], &coeffs[3],
 402                 &eol
 403             );
 404         else if(order == 0)
 405             props = sscanf(value, " %f %c", &coeffs[0], &eol);
 406         if(props == 0)
 407         {
 408             ERR("Failed to parse option %s properties\n", chanlayout);
 409             return false;
 410         }
 411
 412         if(props > (order+1)*(order+1))
 413         {
 414             ERR("Excess elements in option %s (expected %d)\n", chanlayout, (order+1)*(order+1));
 415             return false;
 416         }
 417
 418         for(j = 0;j < MAX_AMBI_COEFFS;++j)
 419             chanmap[i].Config[j] = coeffs[j];
 420     }
 421     SetChannelMap(device, chanmap, count, ambiscale, isfuma);
 422     return true;
 423 }
 424
 425 ALvoid aluInitPanning(ALCdevice *device)
 426 {
 427     /* NOTE: These decoder coefficients are using FuMa channel ordering and
 428      * normalization, since that's what was produced by the Ambisonic Decoder
 429      * Toolbox. SetChannelMap will convert them to N3D.
 430      */
 431     static const ChannelMap MonoCfg[1] = {
 432         { FrontCenter, { 1.4142f } },
 433     }, StereoCfg[2] = {
 434         { FrontLeft,   { 0.7071f, 0.0f,  0.5f, 0.0f } },
 435         { FrontRight,  { 0.7071f, 0.0f, -0.5f, 0.0f } },
 436     }, QuadCfg[4] = {
 437         { FrontLeft,   { 0.353553f,  0.306184f,  0.306184f, 0.0f, 0.0f, 0.0f, 0.0f,  0.000000f,  0.117186f } },
 438         { FrontRight,  { 0.353553f,  0.306184f, -0.306184f, 0.0f, 0.0f, 0.0f, 0.0f,  0.000000f, -0.117186f } },
 439         { BackLeft,    { 0.353553f, -0.306184f,  0.306184f, 0.0f, 0.0f, 0.0f, 0.0f,  0.000000f, -0.117186f } },
 440         { BackRight,   { 0.353553f, -0.306184f, -0.306184f, 0.0f, 0.0f, 0.0f, 0.0f,  0.000000f,  0.117186f } },
 441     }, X51SideCfg[5] = {
 442         { 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 } },
 443         { 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 } },
 444         { 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 } },
 445         { 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 } },
 446         { 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 } },
 447     }, X51RearCfg[5] = {
 448         { 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 } },
 449         { 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 } },
 450         { 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 } },
 451         { 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 } },
 452         { 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 } },
 453     }, X61Cfg[6] = {
 454         { 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 } },
 455         { 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 } },
 456         { 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 } },
 457         { 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,  0.000000f } },
 458         { 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 } },
 459         { 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 } },
 460     }, X71Cfg[7] = {
 461         { 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 } },
 462         { 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 } },
 463         { 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 } },
 464         { 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 } },
 465         { 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 } },
 466         { SideLeft,    { 0.224739f,  0.000000f,  0.340644f, 0.0f, 0.0f, 0.0f, 0.0f, -0.210697f,  0.000000f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f,  0.000000f, -0.065795f } },
 467         { SideRight,   { 0.224739f,  0.000000f, -0.340644f, 0.0f, 0.0f, 0.0f, 0.0f, -0.210697f,  0.000000f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f,  0.000000f,  0.065795f } },
 468     }, BFormat3D[4] = {
 469         { BFormatW, { 1.0f, 0.0f, 0.0f, 0.0f } },
 470         { BFormatX, { 0.0f, 1.0f, 0.0f, 0.0f } },
 471         { BFormatY, { 0.0f, 0.0f, 1.0f, 0.0f } },
 472         { BFormatZ, { 0.0f, 0.0f, 0.0f, 1.0f } },
 473     };
 474     const ChannelMap *chanmap = NULL;
 475     ALfloat ambiscale = 1.0f;
 476     size_t count = 0;
 477
 478     device->AmbiScale = 1.0f;
 479     memset(device->AmbiCoeffs, 0, sizeof(device->AmbiCoeffs));
 480     device->NumChannels = 0;
 481
 482     if(device->Hrtf)
 483     {
 484         ALfloat (*coeffs_list[4])[2];
 485         ALuint *delay_list[4];
 486         ALuint i;
 487
 488         count = COUNTOF(BFormat3D);
 489         chanmap = BFormat3D;
 490         ambiscale = 1.0f;
 491
 492         for(i = 0;i < count;i++)
 493             device->ChannelName[i] = chanmap[i].ChanName;
 494         for(;i < MAX_OUTPUT_CHANNELS;i++)
 495             device->ChannelName[i] = InvalidChannel;
 496         SetChannelMap(device, chanmap, count, ambiscale, AL_TRUE);
 497
 498         for(i = 0;i < 4;++i)
 499         {
 500             static const enum Channel inputs[4] = { BFormatW, BFormatX, BFormatY, BFormatZ };
 501             int chan = GetChannelIdxByName(device, inputs[i]);
 502             coeffs_list[i] = device->Hrtf_Params[chan].Coeffs;
 503             delay_list[i] = device->Hrtf_Params[chan].Delay;
 504         }
 505         GetBFormatHrtfCoeffs(device->Hrtf, 4, coeffs_list, delay_list);
 506
 507         return;
 508     }
 509
 510     if(LoadChannelSetup(device))
 511         return;
 512
 513     switch(device->FmtChans)
 514     {
 515         case DevFmtMono:
 516             count = COUNTOF(MonoCfg);
 517             chanmap = MonoCfg;
 518             ambiscale = ZERO_ORDER_SCALE;
 519             break;
 520
 521         case DevFmtStereo:
 522             count = COUNTOF(StereoCfg);
 523             chanmap = StereoCfg;
 524             ambiscale = FIRST_ORDER_SCALE;
 525             break;
 526
 527         case DevFmtQuad:
 528             count = COUNTOF(QuadCfg);
 529             chanmap = QuadCfg;
 530             ambiscale = SECOND_ORDER_SCALE;
 531             break;
 532
 533         case DevFmtX51:
 534             count = COUNTOF(X51SideCfg);
 535             chanmap = X51SideCfg;
 536             ambiscale = THIRD_ORDER_SCALE;
 537             break;
 538
 539         case DevFmtX51Rear:
 540             count = COUNTOF(X51RearCfg);
 541             chanmap = X51RearCfg;
 542             ambiscale = THIRD_ORDER_SCALE;
 543             break;
 544
 545         case DevFmtX61:
 546             count = COUNTOF(X61Cfg);
 547             chanmap = X61Cfg;
 548             ambiscale = THIRD_ORDER_SCALE;
 549             break;
 550
 551         case DevFmtX71:
 552             count = COUNTOF(X71Cfg);
 553             chanmap = X71Cfg;
 554             ambiscale = THIRD_ORDER_SCALE;
 555             break;
 556
 557         case DevFmtBFormat3D:
 558             count = COUNTOF(BFormat3D);
 559             chanmap = BFormat3D;
 560             ambiscale = 1.0f;
 561             break;
 562     }
 563
 564     SetChannelMap(device, chanmap, count, ambiscale, AL_TRUE);
 565 }