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 extern inline void CalcXYZCoeffs(ALfloat x, ALfloat y, ALfloat z, ALfloat coeffs[MAX_AMBI_COEFFS]);
  37
  38
  39 #define ZERO_ORDER_SCALE    0.0f
  40 #define FIRST_ORDER_SCALE   1.0f
  41 #define SECOND_ORDER_SCALE  (1.0f / 1.22474f)
  42 #define THIRD_ORDER_SCALE   (1.0f / 1.30657f)
  43
  44
  45 static const ALuint FuMa2ACN[MAX_AMBI_COEFFS] = {
  46     0,  /* W */
  47     3,  /* X */
  48     1,  /* Y */
  49     2,  /* Z */
  50     6,  /* R */
  51     7,  /* S */
  52     5,  /* T */
  53     8,  /* U */
  54     4,  /* V */
  55     12, /* K */
  56     13, /* L */
  57     11, /* M */
  58     14, /* N */
  59     10, /* O */
  60     15, /* P */
  61     9,  /* Q */
  62 };
  63
  64 /* NOTE: These are scale factors as applied to Ambisonics content. FuMa
  65  * decoder coefficients should be divided by these values to get N3D decoder
  66  * coefficients.
  67  */
  68 static const ALfloat FuMa2N3DScale[MAX_AMBI_COEFFS] = {
  69     1.414213562f, /* ACN  0 (W), sqrt(2) */
  70     1.732050808f, /* ACN  1 (Y), sqrt(3) */
  71     1.732050808f, /* ACN  2 (Z), sqrt(3) */
  72     1.732050808f, /* ACN  3 (X), sqrt(3) */
  73     1.936491673f, /* ACN  4 (V), sqrt(15)/2 */
  74     1.936491673f, /* ACN  5 (T), sqrt(15)/2 */
  75     2.236067978f, /* ACN  6 (R), sqrt(5) */
  76     1.936491673f, /* ACN  7 (S), sqrt(15)/2 */
  77     1.936491673f, /* ACN  8 (U), sqrt(15)/2 */
  78     2.091650066f, /* ACN  9 (Q), sqrt(35/8) */
  79     1.972026594f, /* ACN 10 (O), sqrt(35)/3 */
  80     2.231093404f, /* ACN 11 (M), sqrt(224/45) */
  81     2.645751311f, /* ACN 12 (K), sqrt(7) */
  82     2.231093404f, /* ACN 13 (L), sqrt(224/45) */
  83     1.972026594f, /* ACN 14 (N), sqrt(35)/3 */
  84     2.091650066f, /* ACN 15 (P), sqrt(35/8) */
  85 };
  86
  87
  88 void CalcDirectionCoeffs(const ALfloat dir[3], ALfloat coeffs[MAX_AMBI_COEFFS])
  89 {
  90     /* Convert from OpenAL coords to Ambisonics. */
  91     ALfloat x = -dir[2];
  92     ALfloat y = -dir[0];
  93     ALfloat z =  dir[1];
  94
  95     /* Zeroth-order */
  96     coeffs[0]  = 1.0f; /* ACN 0 = 1 */
  97     /* First-order */
  98     coeffs[1]  = 1.732050808f * y; /* ACN 1 = sqrt(3) * Y */
  99     coeffs[2]  = 1.732050808f * z; /* ACN 2 = sqrt(3) * Z */
 100     coeffs[3]  = 1.732050808f * x; /* ACN 3 = sqrt(3) * X */
 101     /* Second-order */
 102     coeffs[4]  = 3.872983346f * x * y;             /* ACN 4 = sqrt(15) * X * Y */
 103     coeffs[5]  = 3.872983346f * y * z;             /* ACN 5 = sqrt(15) * Y * Z */
 104     coeffs[6]  = 1.118033989f * (3.0f*z*z - 1.0f); /* ACN 6 = sqrt(5)/2 * (3*Z*Z - 1) */
 105     coeffs[7]  = 3.872983346f * x * z;             /* ACN 7 = sqrt(15) * X * Z */
 106     coeffs[8]  = 1.936491673f * (x*x - y*y);       /* ACN 8 = sqrt(15)/2 * (X*X - Y*Y) */
 107     /* Third-order */
 108     coeffs[9]  =  2.091650066f * y * (3.0f*x*x - y*y);  /* ACN  9 = sqrt(35/8) * Y * (3*X*X - Y*Y) */
 109     coeffs[10] = 10.246950766f * z * x * y;             /* ACN 10 = sqrt(105) * Z * X * Y */
 110     coeffs[11] =  1.620185175f * y * (5.0f*z*z - 1.0f); /* ACN 11 = sqrt(21/8) * Y * (5*Z*Z - 1) */
 111     coeffs[12] =  1.322875656f * z * (5.0f*z*z - 3.0f); /* ACN 12 = sqrt(7)/2 * Z * (5*Z*Z - 3) */
 112     coeffs[13] =  1.620185175f * x * (5.0f*z*z - 1.0f); /* ACN 13 = sqrt(21/8) * X * (5*Z*Z - 1) */
 113     coeffs[14] =  5.123475383f * z * (x*x - y*y);       /* ACN 14 = sqrt(105)/2 * Z * (X*X - Y*Y) */
 114     coeffs[15] =  2.091650066f * x * (x*x - 3.0f*y*y);  /* ACN 15 = sqrt(35/8) * X * (X*X - 3*Y*Y) */
 115 }
 116
 117 void CalcAngleCoeffs(ALfloat angle, ALfloat elevation, ALfloat coeffs[MAX_AMBI_COEFFS])
 118 {
 119     ALfloat dir[3] = {
 120         sinf(angle) * cosf(elevation),
 121         sinf(elevation),
 122         -cosf(angle) * cosf(elevation)
 123     };
 124     CalcDirectionCoeffs(dir, coeffs);
 125 }
 126
 127
 128 void ComputeAmbientGains(const ChannelConfig *chancoeffs, ALuint numchans, ALfloat ingain, ALfloat gains[MAX_OUTPUT_CHANNELS])
 129 {
 130     ALuint i;
 131
 132     for(i = 0;i < numchans;i++)
 133     {
 134         // The W coefficients are based on a mathematical average of the
 135         // output. The square root of the base average provides for a more
 136         // perceptual average volume, better suited to non-directional gains.
 137         gains[i] = sqrtf(chancoeffs[i][0]) * ingain;
 138     }
 139     for(;i < MAX_OUTPUT_CHANNELS;i++)
 140         gains[i] = 0.0f;
 141 }
 142
 143 void ComputePanningGains(const ChannelConfig *chancoeffs, ALuint numchans, const ALfloat coeffs[MAX_AMBI_COEFFS], ALfloat ingain, ALfloat gains[MAX_OUTPUT_CHANNELS])
 144 {
 145     ALuint i, j;
 146
 147     for(i = 0;i < numchans;i++)
 148     {
 149         float gain = 0.0f;
 150         for(j = 0;j < MAX_AMBI_COEFFS;j++)
 151             gain += chancoeffs[i][j]*coeffs[j];
 152         gains[i] = gain * ingain;
 153     }
 154     for(;i < MAX_OUTPUT_CHANNELS;i++)
 155         gains[i] = 0.0f;
 156 }
 157
 158 void ComputeBFormatGains(const ChannelConfig *chancoeffs, ALuint numchans, const ALfloat mtx[4], ALfloat ingain, ALfloat gains[MAX_OUTPUT_CHANNELS])
 159 {
 160     ALuint i, j;
 161
 162     for(i = 0;i < numchans;i++)
 163     {
 164         float gain = 0.0f;
 165         for(j = 0;j < 4;j++)
 166             gain += chancoeffs[i][j] * mtx[j];
 167         gains[i] = gain * ingain;
 168     }
 169     for(;i < MAX_OUTPUT_CHANNELS;i++)
 170         gains[i] = 0.0f;
 171 }
 172
 173
 174 DECL_CONST static inline const char *GetLabelFromChannel(enum Channel channel)
 175 {
 176     switch(channel)
 177     {
 178         case FrontLeft: return "front-left";
 179         case FrontRight: return "front-right";
 180         case FrontCenter: return "front-center";
 181         case LFE: return "lfe";
 182         case BackLeft: return "back-left";
 183         case BackRight: return "back-right";
 184         case BackCenter: return "back-center";
 185         case SideLeft: return "side-left";
 186         case SideRight: return "side-right";
 187
 188         case BFormatW: return "bformat-w";
 189         case BFormatX: return "bformat-x";
 190         case BFormatY: return "bformat-y";
 191         case BFormatZ: return "bformat-z";
 192
 193         case InvalidChannel: break;
 194     }
 195     return "(unknown)";
 196 }
 197
 198
 199 typedef struct ChannelMap {
 200     enum Channel ChanName;
 201     ChannelConfig Config;
 202 } ChannelMap;
 203
 204 static void SetChannelMap(const enum Channel *devchans, ChannelConfig *ambicoeffs,
 205                           const ChannelMap *chanmap, size_t count, ALuint *outcount,
 206                           ALboolean isfuma)
 207 {
 208     size_t j, k;
 209     ALuint i;
 210
 211     for(i = 0;i < MAX_OUTPUT_CHANNELS && devchans[i] != InvalidChannel;i++)
 212     {
 213         if(devchans[i] == LFE)
 214         {
 215             for(j = 0;j < MAX_AMBI_COEFFS;j++)
 216                 ambicoeffs[i][j] = 0.0f;
 217             continue;
 218         }
 219
 220         for(j = 0;j < count;j++)
 221         {
 222             if(devchans[i] != chanmap[j].ChanName)
 223                 continue;
 224
 225             if(isfuma)
 226             {
 227                 /* Reformat FuMa -> ACN/N3D */
 228                 for(k = 0;k < MAX_AMBI_COEFFS;++k)
 229                 {
 230                     ALuint acn = FuMa2ACN[k];
 231                     ambicoeffs[i][acn] = chanmap[j].Config[k] / FuMa2N3DScale[acn];
 232                 }
 233             }
 234             else
 235             {
 236                 for(k = 0;k < MAX_AMBI_COEFFS;++k)
 237                     ambicoeffs[i][k] = chanmap[j].Config[k];
 238             }
 239             break;
 240         }
 241         if(j == count)
 242             ERR("Failed to match %s channel (%u) in channel map\n", GetLabelFromChannel(devchans[i]), i);
 243     }
 244     *outcount = 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->ChannelName, device->AmbiCoeffs, chanmap, count,
 422                   &device->NumChannels, isfuma);
 423     device->AmbiScale = ambiscale;
 424     return true;
 425 }
 426
 427 ALvoid aluInitPanning(ALCdevice *device)
 428 {
 429     /* NOTE: These decoder coefficients are using FuMa channel ordering and
 430      * normalization, since that's what was produced by the Ambisonic Decoder
 431      * Toolbox. SetChannelMap will convert them to N3D.
 432      */
 433     static const ChannelMap MonoCfg[1] = {
 434         { FrontCenter, { 1.414213562f } },
 435     }, StereoCfg[2] = {
 436         { FrontLeft,   { 0.707106781f, 0.0f,  0.5f, 0.0f } },
 437         { FrontRight,  { 0.707106781f, 0.0f, -0.5f, 0.0f } },
 438     }, QuadCfg[4] = {
 439         { FrontLeft,   { 0.353553f,  0.306184f,  0.306184f, 0.0f, 0.0f, 0.0f, 0.0f,  0.000000f,  0.117186f } },
 440         { FrontRight,  { 0.353553f,  0.306184f, -0.306184f, 0.0f, 0.0f, 0.0f, 0.0f,  0.000000f, -0.117186f } },
 441         { BackLeft,    { 0.353553f, -0.306184f,  0.306184f, 0.0f, 0.0f, 0.0f, 0.0f,  0.000000f, -0.117186f } },
 442         { BackRight,   { 0.353553f, -0.306184f, -0.306184f, 0.0f, 0.0f, 0.0f, 0.0f,  0.000000f,  0.117186f } },
 443     }, X51SideCfg[5] = {
 444         { 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 } },
 445         { 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 } },
 446         { 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 } },
 447         { 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 } },
 448         { 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 } },
 449     }, X51RearCfg[5] = {
 450         { 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 } },
 451         { 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 } },
 452         { 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 } },
 453         { 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 } },
 454         { 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 } },
 455     }, X61Cfg[6] = {
 456         { 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 } },
 457         { 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 } },
 458         { 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 } },
 459         { 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 } },
 460         { 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 } },
 461         { 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 } },
 462     }, X71Cfg[7] = {
 463         { 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 } },
 464         { 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 } },
 465         { 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 } },
 466         { 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 } },
 467         { 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 } },
 468         { 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 } },
 469         { 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 } },
 470     }, BFormat3D[4] = {
 471         { BFormatW, { 1.0f, 0.0f, 0.0f, 0.0f } },
 472         { BFormatX, { 0.0f, 1.0f, 0.0f, 0.0f } },
 473         { BFormatY, { 0.0f, 0.0f, 1.0f, 0.0f } },
 474         { BFormatZ, { 0.0f, 0.0f, 0.0f, 1.0f } },
 475     };
 476     const ChannelMap *chanmap = NULL;
 477     ALfloat ambiscale = 1.0f;
 478     size_t count = 0;
 479
 480     device->AmbiScale = 1.0f;
 481     memset(device->AmbiCoeffs, 0, sizeof(device->AmbiCoeffs));
 482     device->NumChannels = 0;
 483
 484     if(device->Hrtf)
 485     {
 486         ALfloat (*coeffs_list[4])[2];
 487         ALuint *delay_list[4];
 488         ALuint i;
 489
 490         count = COUNTOF(BFormat3D);
 491         chanmap = BFormat3D;
 492         ambiscale = 1.0f;
 493
 494         for(i = 0;i < count;i++)
 495             device->ChannelName[i] = chanmap[i].ChanName;
 496         for(;i < MAX_OUTPUT_CHANNELS;i++)
 497             device->ChannelName[i] = InvalidChannel;
 498         SetChannelMap(device->ChannelName, device->AmbiCoeffs, chanmap, count,
 499                       &device->NumChannels, AL_TRUE);
 500         device->AmbiScale = ambiscale;
 501
 502         for(i = 0;i < 4;++i)
 503         {
 504             static const enum Channel inputs[4] = { BFormatW, BFormatX, BFormatY, BFormatZ };
 505             int chan = GetChannelIdxByName(device, inputs[i]);
 506             coeffs_list[i] = device->Hrtf_Params[chan].Coeffs;
 507             delay_list[i] = device->Hrtf_Params[chan].Delay;
 508         }
 509         GetBFormatHrtfCoeffs(device->Hrtf, 4, coeffs_list, delay_list);
 510
 511         return;
 512     }
 513
 514     if(LoadChannelSetup(device))
 515         return;
 516
 517     switch(device->FmtChans)
 518     {
 519         case DevFmtMono:
 520             count = COUNTOF(MonoCfg);
 521             chanmap = MonoCfg;
 522             ambiscale = ZERO_ORDER_SCALE;
 523             break;
 524
 525         case DevFmtStereo:
 526             count = COUNTOF(StereoCfg);
 527             chanmap = StereoCfg;
 528             ambiscale = FIRST_ORDER_SCALE;
 529             break;
 530
 531         case DevFmtQuad:
 532             count = COUNTOF(QuadCfg);
 533             chanmap = QuadCfg;
 534             ambiscale = SECOND_ORDER_SCALE;
 535             break;
 536
 537         case DevFmtX51:
 538             count = COUNTOF(X51SideCfg);
 539             chanmap = X51SideCfg;
 540             ambiscale = THIRD_ORDER_SCALE;
 541             break;
 542
 543         case DevFmtX51Rear:
 544             count = COUNTOF(X51RearCfg);
 545             chanmap = X51RearCfg;
 546             ambiscale = THIRD_ORDER_SCALE;
 547             break;
 548
 549         case DevFmtX61:
 550             count = COUNTOF(X61Cfg);
 551             chanmap = X61Cfg;
 552             ambiscale = THIRD_ORDER_SCALE;
 553             break;
 554
 555         case DevFmtX71:
 556             count = COUNTOF(X71Cfg);
 557             chanmap = X71Cfg;
 558             ambiscale = THIRD_ORDER_SCALE;
 559             break;
 560
 561         case DevFmtBFormat3D:
 562             count = COUNTOF(BFormat3D);
 563             chanmap = BFormat3D;
 564             ambiscale = 1.0f;
 565             break;
 566     }
 567
 568     SetChannelMap(device->ChannelName, device->AmbiCoeffs, chanmap, count,
 569                   &device->NumChannels, AL_TRUE);
 570     device->AmbiScale = ambiscale;
 571 }