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 "alAuxEffectSlot.h"
  31 #include "alu.h"
  32 #include "bool.h"
  33 #include "ambdec.h"
  34 #include "bformatdec.h"
  35
  36
  37 extern inline void CalcXYZCoeffs(ALfloat x, ALfloat y, ALfloat z, ALfloat coeffs[MAX_AMBI_COEFFS]);
  38
  39
  40 #define ZERO_ORDER_SCALE    0.0f
  41 #define FIRST_ORDER_SCALE   1.0f
  42 #define SECOND_ORDER_SCALE  (1.0f / 1.22474f)
  43 #define THIRD_ORDER_SCALE   (1.0f / 1.30657f)
  44
  45
  46 static const ALuint FuMa2ACN[MAX_AMBI_COEFFS] = {
  47     0,  /* W */
  48     3,  /* X */
  49     1,  /* Y */
  50     2,  /* Z */
  51     6,  /* R */
  52     7,  /* S */
  53     5,  /* T */
  54     8,  /* U */
  55     4,  /* V */
  56     12, /* K */
  57     13, /* L */
  58     11, /* M */
  59     14, /* N */
  60     10, /* O */
  61     15, /* P */
  62     9,  /* Q */
  63 };
  64
  65 /* NOTE: These are scale factors as applied to Ambisonics content. Decoder
  66  * coefficients should be divided by these values to get proper N3D scalings.
  67  */
  68 static const ALfloat UnitScale[MAX_AMBI_COEFFS] = {
  69     1.0f, 1.0f, 1.0f, 1.0f, 1.0f, 1.0f, 1.0f, 1.0f,
  70     1.0f, 1.0f, 1.0f, 1.0f, 1.0f, 1.0f, 1.0f, 1.0f
  71 };
  72 static const ALfloat SN3D2N3DScale[MAX_AMBI_COEFFS] = {
  73     1.000000000f, /* ACN  0 (W), sqrt(1) */
  74     1.732050808f, /* ACN  1 (Y), sqrt(3) */
  75     1.732050808f, /* ACN  2 (Z), sqrt(3) */
  76     1.732050808f, /* ACN  3 (X), sqrt(3) */
  77     2.236067978f, /* ACN  4 (V), sqrt(5) */
  78     2.236067978f, /* ACN  5 (T), sqrt(5) */
  79     2.236067978f, /* ACN  6 (R), sqrt(5) */
  80     2.236067978f, /* ACN  7 (S), sqrt(5) */
  81     2.236067978f, /* ACN  8 (U), sqrt(5) */
  82     2.645751311f, /* ACN  9 (Q), sqrt(7) */
  83     2.645751311f, /* ACN 10 (O), sqrt(7) */
  84     2.645751311f, /* ACN 11 (M), sqrt(7) */
  85     2.645751311f, /* ACN 12 (K), sqrt(7) */
  86     2.645751311f, /* ACN 13 (L), sqrt(7) */
  87     2.645751311f, /* ACN 14 (N), sqrt(7) */
  88     2.645751311f, /* ACN 15 (P), sqrt(7) */
  89 };
  90 static const ALfloat FuMa2N3DScale[MAX_AMBI_COEFFS] = {
  91     1.414213562f, /* ACN  0 (W), sqrt(2) */
  92     1.732050808f, /* ACN  1 (Y), sqrt(3) */
  93     1.732050808f, /* ACN  2 (Z), sqrt(3) */
  94     1.732050808f, /* ACN  3 (X), sqrt(3) */
  95     1.936491673f, /* ACN  4 (V), sqrt(15)/2 */
  96     1.936491673f, /* ACN  5 (T), sqrt(15)/2 */
  97     2.236067978f, /* ACN  6 (R), sqrt(5) */
  98     1.936491673f, /* ACN  7 (S), sqrt(15)/2 */
  99     1.936491673f, /* ACN  8 (U), sqrt(15)/2 */
 100     2.091650066f, /* ACN  9 (Q), sqrt(35/8) */
 101     1.972026594f, /* ACN 10 (O), sqrt(35)/3 */
 102     2.231093404f, /* ACN 11 (M), sqrt(224/45) */
 103     2.645751311f, /* ACN 12 (K), sqrt(7) */
 104     2.231093404f, /* ACN 13 (L), sqrt(224/45) */
 105     1.972026594f, /* ACN 14 (N), sqrt(35)/3 */
 106     2.091650066f, /* ACN 15 (P), sqrt(35/8) */
 107 };
 108
 109
 110 void CalcDirectionCoeffs(const ALfloat dir[3], ALfloat coeffs[MAX_AMBI_COEFFS])
 111 {
 112     /* Convert from OpenAL coords to Ambisonics. */
 113     ALfloat x = -dir[2];
 114     ALfloat y = -dir[0];
 115     ALfloat z =  dir[1];
 116
 117     /* Zeroth-order */
 118     coeffs[0]  = 1.0f; /* ACN 0 = 1 */
 119     /* First-order */
 120     coeffs[1]  = 1.732050808f * y; /* ACN 1 = sqrt(3) * Y */
 121     coeffs[2]  = 1.732050808f * z; /* ACN 2 = sqrt(3) * Z */
 122     coeffs[3]  = 1.732050808f * x; /* ACN 3 = sqrt(3) * X */
 123     /* Second-order */
 124     coeffs[4]  = 3.872983346f * x * y;             /* ACN 4 = sqrt(15) * X * Y */
 125     coeffs[5]  = 3.872983346f * y * z;             /* ACN 5 = sqrt(15) * Y * Z */
 126     coeffs[6]  = 1.118033989f * (3.0f*z*z - 1.0f); /* ACN 6 = sqrt(5)/2 * (3*Z*Z - 1) */
 127     coeffs[7]  = 3.872983346f * x * z;             /* ACN 7 = sqrt(15) * X * Z */
 128     coeffs[8]  = 1.936491673f * (x*x - y*y);       /* ACN 8 = sqrt(15)/2 * (X*X - Y*Y) */
 129     /* Third-order */
 130     coeffs[9]  =  2.091650066f * y * (3.0f*x*x - y*y);  /* ACN  9 = sqrt(35/8) * Y * (3*X*X - Y*Y) */
 131     coeffs[10] = 10.246950766f * z * x * y;             /* ACN 10 = sqrt(105) * Z * X * Y */
 132     coeffs[11] =  1.620185175f * y * (5.0f*z*z - 1.0f); /* ACN 11 = sqrt(21/8) * Y * (5*Z*Z - 1) */
 133     coeffs[12] =  1.322875656f * z * (5.0f*z*z - 3.0f); /* ACN 12 = sqrt(7)/2 * Z * (5*Z*Z - 3) */
 134     coeffs[13] =  1.620185175f * x * (5.0f*z*z - 1.0f); /* ACN 13 = sqrt(21/8) * X * (5*Z*Z - 1) */
 135     coeffs[14] =  5.123475383f * z * (x*x - y*y);       /* ACN 14 = sqrt(105)/2 * Z * (X*X - Y*Y) */
 136     coeffs[15] =  2.091650066f * x * (x*x - 3.0f*y*y);  /* ACN 15 = sqrt(35/8) * X * (X*X - 3*Y*Y) */
 137 }
 138
 139 void CalcAngleCoeffs(ALfloat angle, ALfloat elevation, ALfloat coeffs[MAX_AMBI_COEFFS])
 140 {
 141     ALfloat dir[3] = {
 142         sinf(angle) * cosf(elevation),
 143         sinf(elevation),
 144         -cosf(angle) * cosf(elevation)
 145     };
 146     CalcDirectionCoeffs(dir, coeffs);
 147 }
 148
 149
 150 void ComputeAmbientGains(const ChannelConfig *chancoeffs, ALuint numchans, ALfloat ingain, ALfloat gains[MAX_OUTPUT_CHANNELS])
 151 {
 152     ALuint i;
 153
 154     for(i = 0;i < numchans;i++)
 155     {
 156         // The W coefficients are based on a mathematical average of the
 157         // output. The square root of the base average provides for a more
 158         // perceptual average volume, better suited to non-directional gains.
 159         gains[i] = sqrtf(chancoeffs[i][0]) * ingain;
 160     }
 161     for(;i < MAX_OUTPUT_CHANNELS;i++)
 162         gains[i] = 0.0f;
 163 }
 164
 165 void ComputePanningGains(const ChannelConfig *chancoeffs, ALuint numchans, const ALfloat coeffs[MAX_AMBI_COEFFS], ALfloat ingain, ALfloat gains[MAX_OUTPUT_CHANNELS])
 166 {
 167     ALuint i, j;
 168
 169     for(i = 0;i < numchans;i++)
 170     {
 171         float gain = 0.0f;
 172         for(j = 0;j < MAX_AMBI_COEFFS;j++)
 173             gain += chancoeffs[i][j]*coeffs[j];
 174         gains[i] = gain * ingain;
 175     }
 176     for(;i < MAX_OUTPUT_CHANNELS;i++)
 177         gains[i] = 0.0f;
 178 }
 179
 180 void ComputeFirstOrderGains(const ChannelConfig *chancoeffs, ALuint numchans, const ALfloat mtx[4], ALfloat ingain, ALfloat gains[MAX_OUTPUT_CHANNELS])
 181 {
 182     ALuint i, j;
 183
 184     for(i = 0;i < numchans;i++)
 185     {
 186         float gain = 0.0f;
 187         for(j = 0;j < 4;j++)
 188             gain += chancoeffs[i][j] * mtx[j];
 189         gains[i] = gain * ingain;
 190     }
 191     for(;i < MAX_OUTPUT_CHANNELS;i++)
 192         gains[i] = 0.0f;
 193 }
 194
 195
 196 DECL_CONST static inline const char *GetLabelFromChannel(enum Channel channel)
 197 {
 198     switch(channel)
 199     {
 200         case FrontLeft: return "front-left";
 201         case FrontRight: return "front-right";
 202         case FrontCenter: return "front-center";
 203         case LFE: return "lfe";
 204         case BackLeft: return "back-left";
 205         case BackRight: return "back-right";
 206         case BackCenter: return "back-center";
 207         case SideLeft: return "side-left";
 208         case SideRight: return "side-right";
 209
 210         case UpperFrontLeft: return "upper-front-left";
 211         case UpperFrontRight: return "upper-front-right";
 212         case UpperBackLeft: return "upper-back-left";
 213         case UpperBackRight: return "upper-back-right";
 214         case LowerFrontLeft: return "lower-front-left";
 215         case LowerFrontRight: return "lower-front-right";
 216         case LowerBackLeft: return "lower-back-left";
 217         case LowerBackRight: return "lower-back-right";
 218
 219         case Aux0: return "aux-0";
 220         case Aux1: return "aux-1";
 221         case Aux2: return "aux-2";
 222         case Aux3: return "aux-3";
 223         case Aux4: return "aux-4";
 224         case Aux5: return "aux-5";
 225         case Aux6: return "aux-6";
 226         case Aux7: return "aux-7";
 227         case Aux8: return "aux-8";
 228
 229         case InvalidChannel: break;
 230     }
 231     return "(unknown)";
 232 }
 233
 234
 235 DECL_CONST static const char *GetChannelLayoutName(enum DevFmtChannels chans)
 236 {
 237     switch(chans)
 238     {
 239         case DevFmtMono: return "mono";
 240         case DevFmtStereo: return "stereo";
 241         case DevFmtQuad: return "quad";
 242         case DevFmtX51: return "surround51";
 243         case DevFmtX51Rear: return "surround51rear";
 244         case DevFmtX61: return "surround61";
 245         case DevFmtX71: return "surround71";
 246         case DevFmtBFormat3D:
 247             break;
 248     }
 249     return NULL;
 250 }
 251
 252 typedef struct ChannelMap {
 253     enum Channel ChanName;
 254     ChannelConfig Config;
 255 } ChannelMap;
 256
 257 static void SetChannelMap(const enum Channel *devchans, ChannelConfig *ambicoeffs,
 258                           const ChannelMap *chanmap, size_t count, ALuint *outcount,
 259                           ALboolean isfuma)
 260 {
 261     size_t j, k;
 262     ALuint i;
 263
 264     for(i = 0;i < MAX_OUTPUT_CHANNELS && devchans[i] != InvalidChannel;i++)
 265     {
 266         if(devchans[i] == LFE)
 267         {
 268             for(j = 0;j < MAX_AMBI_COEFFS;j++)
 269                 ambicoeffs[i][j] = 0.0f;
 270             continue;
 271         }
 272
 273         for(j = 0;j < count;j++)
 274         {
 275             if(devchans[i] != chanmap[j].ChanName)
 276                 continue;
 277
 278             if(isfuma)
 279             {
 280                 /* Reformat FuMa -> ACN/N3D */
 281                 for(k = 0;k < MAX_AMBI_COEFFS;++k)
 282                 {
 283                     ALuint acn = FuMa2ACN[k];
 284                     ambicoeffs[i][acn] = chanmap[j].Config[k] / FuMa2N3DScale[acn];
 285                 }
 286             }
 287             else
 288             {
 289                 for(k = 0;k < MAX_AMBI_COEFFS;++k)
 290                     ambicoeffs[i][k] = chanmap[j].Config[k];
 291             }
 292             break;
 293         }
 294         if(j == count)
 295             ERR("Failed to match %s channel (%u) in channel map\n", GetLabelFromChannel(devchans[i]), i);
 296     }
 297     *outcount = i;
 298 }
 299
 300 static bool MakeSpeakerMap(ALCdevice *device, const AmbDecConf *conf, ALuint speakermap[MAX_OUTPUT_CHANNELS])
 301 {
 302     ALuint i;
 303
 304     for(i = 0;i < conf->NumSpeakers;i++)
 305     {
 306         int c = -1;
 307
 308         /* NOTE: AmbDec does not define any standard speaker names, however
 309          * for this to work we have to by able to find the output channel
 310          * the speaker definition corresponds to. Therefore, OpenAL Soft
 311          * requires these channel labels to be recognized:
 312          *
 313          * LF = Front left
 314          * RF = Front right
 315          * LS = Side left
 316          * RS = Side right
 317          * LB = Back left
 318          * RB = Back right
 319          * CE = Front center
 320          * CB = Back center
 321          *
 322          * Additionally, surround51 will acknowledge back speakers for side
 323          * channels, and surround51rear will acknowledge side speakers for
 324          * back channels, to avoid issues with an ambdec expecting 5.1 to
 325          * use the side channels when the device is configured for back,
 326          * and vice-versa.
 327          */
 328         if(al_string_cmp_cstr(conf->Speakers[i].Name, "LF") == 0)
 329             c = GetChannelIdxByName(device->RealOut, FrontLeft);
 330         else if(al_string_cmp_cstr(conf->Speakers[i].Name, "RF") == 0)
 331             c = GetChannelIdxByName(device->RealOut, FrontRight);
 332         else if(al_string_cmp_cstr(conf->Speakers[i].Name, "CE") == 0)
 333             c = GetChannelIdxByName(device->RealOut, FrontCenter);
 334         else if(al_string_cmp_cstr(conf->Speakers[i].Name, "LS") == 0)
 335         {
 336             if(device->FmtChans == DevFmtX51Rear)
 337                 c = GetChannelIdxByName(device->RealOut, BackLeft);
 338             else
 339                 c = GetChannelIdxByName(device->RealOut, SideLeft);
 340         }
 341         else if(al_string_cmp_cstr(conf->Speakers[i].Name, "RS") == 0)
 342         {
 343             if(device->FmtChans == DevFmtX51Rear)
 344                 c = GetChannelIdxByName(device->RealOut, BackRight);
 345             else
 346                 c = GetChannelIdxByName(device->RealOut, SideRight);
 347         }
 348         else if(al_string_cmp_cstr(conf->Speakers[i].Name, "LB") == 0)
 349         {
 350             if(device->FmtChans == DevFmtX51)
 351                 c = GetChannelIdxByName(device->RealOut, SideLeft);
 352             else
 353                 c = GetChannelIdxByName(device->RealOut, BackLeft);
 354         }
 355         else if(al_string_cmp_cstr(conf->Speakers[i].Name, "RB") == 0)
 356         {
 357             if(device->FmtChans == DevFmtX51)
 358                 c = GetChannelIdxByName(device->RealOut, SideRight);
 359             else
 360                 c = GetChannelIdxByName(device->RealOut, BackRight);
 361         }
 362         else if(al_string_cmp_cstr(conf->Speakers[i].Name, "CB") == 0)
 363             c = GetChannelIdxByName(device->RealOut, BackCenter);
 364         else
 365         {
 366             ERR("AmbDec speaker label \"%s\" not recognized\n",
 367                 al_string_get_cstr(conf->Speakers[i].Name));
 368             return false;
 369         }
 370         if(c == -1)
 371         {
 372             ERR("Failed to lookup AmbDec speaker label %s\n",
 373                 al_string_get_cstr(conf->Speakers[i].Name));
 374             return false;
 375         }
 376         speakermap[i] = c;
 377     }
 378
 379     return true;
 380 }
 381
 382 static bool LoadChannelSetup(ALCdevice *device)
 383 {
 384     ChannelMap chanmap[MAX_OUTPUT_CHANNELS];
 385     ALuint speakermap[MAX_OUTPUT_CHANNELS];
 386     const ALfloat *coeff_scale = UnitScale;
 387     const char *layout = NULL;
 388     ALfloat ambiscale = 1.0f;
 389     const char *fname;
 390     AmbDecConf conf;
 391     size_t i;
 392
 393     layout = GetChannelLayoutName(device->FmtChans);
 394     if(!layout) return false;
 395
 396     if(!ConfigValueStr(al_string_get_cstr(device->DeviceName), "layouts", layout, &fname))
 397         return false;
 398
 399     ambdec_init(&conf);
 400     if(!ambdec_load(&conf, fname))
 401     {
 402         ERR("Failed to load layout file %s\n", fname);
 403         goto fail;
 404     }
 405
 406     if(conf.FreqBands != 1)
 407     {
 408         ERR("AmbDec layout file must be single-band (freq_bands = %u)\n", conf.FreqBands);
 409         goto fail;
 410     }
 411
 412     if(!MakeSpeakerMap(device, &conf, speakermap))
 413         goto fail;
 414
 415     if(conf.ChanMask > 0x1ff)
 416         ambiscale = THIRD_ORDER_SCALE;
 417     else if(conf.ChanMask > 0xf)
 418         ambiscale = SECOND_ORDER_SCALE;
 419     else if(conf.ChanMask > 0x1)
 420         ambiscale = FIRST_ORDER_SCALE;
 421     else
 422         ambiscale = 0.0f;
 423
 424     if(conf.CoeffScale == ADS_SN3D)
 425         coeff_scale = SN3D2N3DScale;
 426     else if(conf.CoeffScale == ADS_FuMa)
 427         coeff_scale = FuMa2N3DScale;
 428
 429     for(i = 0;i < conf.NumSpeakers;i++)
 430     {
 431         ALuint chan = speakermap[i];
 432         ALuint j, k = 0;
 433         ALfloat gain;
 434
 435         for(j = 0;j < MAX_AMBI_COEFFS;j++)
 436             chanmap[i].Config[j] = 0.0f;
 437
 438         chanmap[i].ChanName = device->RealOut.ChannelName[chan];
 439         for(j = 0;j < MAX_AMBI_COEFFS;j++)
 440         {
 441             if(j == 0) gain = conf.HFOrderGain[0];
 442             else if(j == 1) gain = conf.HFOrderGain[1];
 443             else if(j == 4) gain = conf.HFOrderGain[2];
 444             else if(j == 9) gain = conf.HFOrderGain[3];
 445             if((conf.ChanMask&(1<<j)))
 446                 chanmap[i].Config[j] = conf.HFMatrix[i][k++] / coeff_scale[j] * gain;
 447         }
 448     }
 449
 450     SetChannelMap(device->Dry.ChannelName, device->Dry.AmbiCoeffs, chanmap, conf.NumSpeakers,
 451                   &device->Dry.NumChannels, AL_FALSE);
 452     device->Dry.AmbiScale = ambiscale;
 453
 454     ambdec_deinit(&conf);
 455     return true;
 456
 457 fail:
 458     ambdec_deinit(&conf);
 459     return false;
 460 }
 461
 462 ALvoid aluInitPanning(ALCdevice *device)
 463 {
 464     /* NOTE: These decoder coefficients are using FuMa channel ordering and
 465      * normalization, since that's what was produced by the Ambisonic Decoder
 466      * Toolbox. SetChannelMap will convert them to N3D.
 467      */
 468     static const ChannelMap MonoCfg[1] = {
 469         { FrontCenter, { 1.414213562f } },
 470     }, StereoCfg[2] = {
 471         { FrontLeft,   { 0.707106781f, 0.0f,  0.5f, 0.0f } },
 472         { FrontRight,  { 0.707106781f, 0.0f, -0.5f, 0.0f } },
 473     }, QuadCfg[4] = {
 474         { FrontLeft,   { 0.353553f,  0.306184f,  0.306184f, 0.0f,  0.0f, 0.0f, 0.0f,  0.000000f,  0.117186f } },
 475         { FrontRight,  { 0.353553f,  0.306184f, -0.306184f, 0.0f,  0.0f, 0.0f, 0.0f,  0.000000f, -0.117186f } },
 476         { BackLeft,    { 0.353553f, -0.306184f,  0.306184f, 0.0f,  0.0f, 0.0f, 0.0f,  0.000000f, -0.117186f } },
 477         { BackRight,   { 0.353553f, -0.306184f, -0.306184f, 0.0f,  0.0f, 0.0f, 0.0f,  0.000000f,  0.117186f } },
 478     }, X51SideCfg[5] = {
 479         { FrontLeft,   { 0.208954f,  0.199518f,  0.223424f, 0.0f,  0.0f, 0.0f, 0.0f, -0.012543f,  0.144260f } },
 480         { FrontRight,  { 0.208950f,  0.199514f, -0.223425f, 0.0f,  0.0f, 0.0f, 0.0f, -0.012544f, -0.144258f } },
 481         { FrontCenter, { 0.109403f,  0.168250f, -0.000002f, 0.0f,  0.0f, 0.0f, 0.0f,  0.100431f, -0.000001f } },
 482         { SideLeft,    { 0.470934f, -0.346484f,  0.327504f, 0.0f,  0.0f, 0.0f, 0.0f, -0.022188f, -0.041113f } },
 483         { SideRight,   { 0.470936f, -0.346480f, -0.327507f, 0.0f,  0.0f, 0.0f, 0.0f, -0.022186f,  0.041114f } },
 484     }, X51RearCfg[5] = {
 485         { FrontLeft,   { 0.208954f,  0.199518f,  0.223424f, 0.0f,  0.0f, 0.0f, 0.0f, -0.012543f,  0.144260f } },
 486         { FrontRight,  { 0.208950f,  0.199514f, -0.223425f, 0.0f,  0.0f, 0.0f, 0.0f, -0.012544f, -0.144258f } },
 487         { FrontCenter, { 0.109403f,  0.168250f, -0.000002f, 0.0f,  0.0f, 0.0f, 0.0f,  0.100431f, -0.000001f } },
 488         { BackLeft,    { 0.470934f, -0.346484f,  0.327504f, 0.0f,  0.0f, 0.0f, 0.0f, -0.022188f, -0.041113f } },
 489         { BackRight,   { 0.470936f, -0.346480f, -0.327507f, 0.0f,  0.0f, 0.0f, 0.0f, -0.022186f,  0.041114f } },
 490     }, X61Cfg[6] = {
 491         { 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 } },
 492         { 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 } },
 493         { 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 } },
 494         { 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 } },
 495         { 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 } },
 496         { 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 } },
 497     }, X71Cfg[7] = {
 498         { 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 } },
 499         { 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 } },
 500         { 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 } },
 501         { 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 } },
 502         { 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 } },
 503         { 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 } },
 504         { 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 } },
 505     }, Cube8Cfg[8] = {
 506         { UpperFrontLeft,  { 0.176776695f,  0.072168784f,  0.072168784f,  0.072168784f } },
 507         { UpperFrontRight, { 0.176776695f,  0.072168784f, -0.072168784f,  0.072168784f } },
 508         { UpperBackLeft,   { 0.176776695f, -0.072168784f,  0.072168784f,  0.072168784f } },
 509         { UpperBackRight,  { 0.176776695f, -0.072168784f, -0.072168784f,  0.072168784f } },
 510         { LowerFrontLeft,  { 0.176776695f,  0.072168784f,  0.072168784f, -0.072168784f } },
 511         { LowerFrontRight, { 0.176776695f,  0.072168784f, -0.072168784f, -0.072168784f } },
 512         { LowerBackLeft,   { 0.176776695f, -0.072168784f,  0.072168784f, -0.072168784f } },
 513         { LowerBackRight,  { 0.176776695f, -0.072168784f, -0.072168784f, -0.072168784f } },
 514     }, BFormat2D[3] = {
 515         { Aux0, { 1.0f, 0.0f, 0.0f, 0.0f } },
 516         { Aux1, { 0.0f, 1.0f, 0.0f, 0.0f } },
 517         { Aux2, { 0.0f, 0.0f, 1.0f, 0.0f } },
 518     }, BFormat3D[4] = {
 519         { Aux0, { 1.0f, 0.0f, 0.0f, 0.0f } },
 520         { Aux1, { 0.0f, 1.0f, 0.0f, 0.0f } },
 521         { Aux2, { 0.0f, 0.0f, 1.0f, 0.0f } },
 522         { Aux3, { 0.0f, 0.0f, 0.0f, 1.0f } },
 523     };
 524     const ChannelMap *chanmap = NULL;
 525     ALfloat ambiscale = 1.0f;
 526     size_t count = 0;
 527     ALuint i;
 528
 529     device->Dry.AmbiScale = 1.0f;
 530     memset(device->Dry.AmbiCoeffs, 0, sizeof(device->Dry.AmbiCoeffs));
 531     device->Dry.NumChannels = 0;
 532
 533     if(device->Hrtf)
 534     {
 535         static const struct {
 536             enum Channel Channel;
 537             ALfloat Angle;
 538             ALfloat Elevation;
 539         } CubeInfo[8] = {
 540             { UpperFrontLeft,  DEG2RAD( -45.0f), DEG2RAD( 45.0f) },
 541             { UpperFrontRight, DEG2RAD(  45.0f), DEG2RAD( 45.0f) },
 542             { UpperBackLeft,   DEG2RAD(-135.0f), DEG2RAD( 45.0f) },
 543             { UpperBackRight,  DEG2RAD( 135.0f), DEG2RAD( 45.0f) },
 544             { LowerFrontLeft,  DEG2RAD( -45.0f), DEG2RAD(-45.0f) },
 545             { LowerFrontRight, DEG2RAD(  45.0f), DEG2RAD(-45.0f) },
 546             { LowerBackLeft,   DEG2RAD(-135.0f), DEG2RAD(-45.0f) },
 547             { LowerBackRight,  DEG2RAD( 135.0f), DEG2RAD(-45.0f) },
 548         };
 549
 550         count = COUNTOF(Cube8Cfg);
 551         chanmap = Cube8Cfg;
 552         ambiscale = FIRST_ORDER_SCALE;
 553
 554         for(i = 0;i < count;i++)
 555             device->Dry.ChannelName[i] = chanmap[i].ChanName;
 556         for(;i < MAX_OUTPUT_CHANNELS;i++)
 557             device->Dry.ChannelName[i] = InvalidChannel;
 558         SetChannelMap(device->Dry.ChannelName, device->Dry.AmbiCoeffs, chanmap, count,
 559                       &device->Dry.NumChannels, AL_TRUE);
 560         device->Dry.AmbiScale = ambiscale;
 561
 562         for(i = 0;i < device->Dry.NumChannels;i++)
 563         {
 564             int chan = GetChannelIdxByName(device->Dry, CubeInfo[i].Channel);
 565             GetLerpedHrtfCoeffs(device->Hrtf, CubeInfo[i].Elevation, CubeInfo[i].Angle, 1.0f, 1.0f,
 566                                 device->Hrtf_Params[chan].Coeffs, device->Hrtf_Params[chan].Delay);
 567         }
 568         return;
 569     }
 570     if(device->Uhj_Encoder)
 571     {
 572         count = COUNTOF(BFormat2D);
 573         chanmap = BFormat2D;
 574         ambiscale = FIRST_ORDER_SCALE;
 575
 576         for(i = 0;i < count;i++)
 577             device->Dry.ChannelName[i] = chanmap[i].ChanName;
 578         for(;i < MAX_OUTPUT_CHANNELS;i++)
 579             device->Dry.ChannelName[i] = InvalidChannel;
 580         SetChannelMap(device->Dry.ChannelName, device->Dry.AmbiCoeffs, chanmap, count,
 581                       &device->Dry.NumChannels, AL_TRUE);
 582         device->Dry.AmbiScale = ambiscale;
 583
 584         return;
 585     }
 586     if(device->AmbiDecoder)
 587     {
 588         /* NOTE: This is ACN/N3D ordering and scaling, rather than FuMa. */
 589         static const ChannelMap Ambi3D[9] = {
 590             { Aux0, { 1.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f } },
 591             { Aux1, { 0.0f, 1.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f } },
 592             { Aux2, { 0.0f, 0.0f, 1.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f } },
 593             { Aux3, { 0.0f, 0.0f, 0.0f, 1.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f } },
 594             { Aux4, { 0.0f, 0.0f, 0.0f, 0.0f, 1.0f, 0.0f, 0.0f, 0.0f, 0.0f } },
 595             { Aux5, { 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 1.0f, 0.0f, 0.0f, 0.0f } },
 596             { Aux6, { 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 1.0f, 0.0f, 0.0f } },
 597             { Aux7, { 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 1.0f, 0.0f } },
 598             { Aux8, { 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 1.0f } },
 599         };
 600         ALuint speakermap[MAX_OUTPUT_CHANNELS];
 601         const char *fname = "";
 602         const char *layout;
 603         AmbDecConf conf;
 604
 605         ambdec_init(&conf);
 606
 607         layout = GetChannelLayoutName(device->FmtChans);
 608         if(!layout) goto ambi_fail;
 609
 610         if(!ConfigValueStr(al_string_get_cstr(device->DeviceName), "decoder", layout, &fname))
 611             goto ambi_fail;
 612
 613         if(!ambdec_load(&conf, fname))
 614         {
 615             ERR("Failed to load %s\n", fname);
 616             goto ambi_fail;
 617         }
 618
 619         if(conf.ChanMask > 0xffff)
 620         {
 621             ERR("Unsupported channel mask 0x%04x (max 0xffff)\n", conf.ChanMask);
 622             goto ambi_fail;
 623         }
 624         if(conf.ChanMask > 0x1ff)
 625         {
 626             ERR("Only first- and second-order is supported for HQ decoding (mask 0x%04x, max 0x1ff)\n",
 627                 conf.ChanMask);
 628             goto ambi_fail;
 629         }
 630
 631         if(!MakeSpeakerMap(device, &conf, speakermap))
 632             goto ambi_fail;
 633
 634         count = (conf.ChanMask > 0xf) ? COUNTOF(Ambi3D) : 4;
 635         chanmap = Ambi3D;
 636         ambiscale = 1.0f;
 637
 638         for(i = 0;i < count;i++)
 639             device->Dry.ChannelName[i] = chanmap[i].ChanName;
 640         for(;i < MAX_OUTPUT_CHANNELS;i++)
 641             device->Dry.ChannelName[i] = InvalidChannel;
 642         SetChannelMap(device->Dry.ChannelName, device->Dry.AmbiCoeffs, chanmap, count,
 643                       &device->Dry.NumChannels, AL_FALSE);
 644         device->Dry.AmbiScale = ambiscale;
 645
 646         TRACE("Enabling %s-band %s-order ambisonic decoder\n",
 647             (conf.FreqBands == 1) ? "single" : "dual",
 648             (conf.ChanMask > 0x1ff) ? "third" : (conf.ChanMask > 0xf) ? "second" : "first"
 649         );
 650         bformatdec_reset(device->AmbiDecoder, &conf, count, device->Frequency, speakermap);
 651         ambdec_deinit(&conf);
 652
 653         if(bformatdec_getOrder(device->AmbiDecoder) >= 2)
 654         {
 655             memset(device->FOAOut.AmbiCoeffs, 0, sizeof(device->FOAOut.AmbiCoeffs));
 656             device->FOAOut.AmbiCoeffs[0][0] = 1.0f;
 657             device->FOAOut.AmbiCoeffs[1][1] = 1.0f;
 658             device->FOAOut.AmbiCoeffs[2][2] = 1.0f;
 659             device->FOAOut.AmbiCoeffs[3][3] = 1.0f;
 660         }
 661
 662         return;
 663
 664     ambi_fail:
 665         ambdec_deinit(&conf);
 666         bformatdec_free(device->AmbiDecoder);
 667         device->AmbiDecoder = NULL;
 668     }
 669
 670     for(i = 0;i < MAX_OUTPUT_CHANNELS;i++)
 671         device->Dry.ChannelName[i] = device->RealOut.ChannelName[i];
 672
 673     if(LoadChannelSetup(device))
 674         return;
 675
 676     switch(device->FmtChans)
 677     {
 678         case DevFmtMono:
 679             count = COUNTOF(MonoCfg);
 680             chanmap = MonoCfg;
 681             ambiscale = ZERO_ORDER_SCALE;
 682             break;
 683
 684         case DevFmtStereo:
 685             count = COUNTOF(StereoCfg);
 686             chanmap = StereoCfg;
 687             ambiscale = FIRST_ORDER_SCALE;
 688             break;
 689
 690         case DevFmtQuad:
 691             count = COUNTOF(QuadCfg);
 692             chanmap = QuadCfg;
 693             ambiscale = SECOND_ORDER_SCALE;
 694             break;
 695
 696         case DevFmtX51:
 697             count = COUNTOF(X51SideCfg);
 698             chanmap = X51SideCfg;
 699             ambiscale = SECOND_ORDER_SCALE;
 700             break;
 701
 702         case DevFmtX51Rear:
 703             count = COUNTOF(X51RearCfg);
 704             chanmap = X51RearCfg;
 705             ambiscale = SECOND_ORDER_SCALE;
 706             break;
 707
 708         case DevFmtX61:
 709             count = COUNTOF(X61Cfg);
 710             chanmap = X61Cfg;
 711             ambiscale = THIRD_ORDER_SCALE;
 712             break;
 713
 714         case DevFmtX71:
 715             count = COUNTOF(X71Cfg);
 716             chanmap = X71Cfg;
 717             ambiscale = THIRD_ORDER_SCALE;
 718             break;
 719
 720         case DevFmtBFormat3D:
 721             count = COUNTOF(BFormat3D);
 722             chanmap = BFormat3D;
 723             ambiscale = 1.0f;
 724             break;
 725     }
 726
 727     SetChannelMap(device->Dry.ChannelName, device->Dry.AmbiCoeffs, chanmap, count,
 728                   &device->Dry.NumChannels, AL_TRUE);
 729     device->Dry.AmbiScale = ambiscale;
 730 }
 731
 732 void aluInitEffectPanning(ALeffectslot *slot)
 733 {
 734     static const ChannelMap FirstOrderN3D[4] = {
 735         { Aux0, { 1.0f, 0.0f, 0.0f, 0.0f } },
 736         { Aux1, { 0.0f, 1.0f, 0.0f, 0.0f } },
 737         { Aux2, { 0.0f, 0.0f, 1.0f, 0.0f } },
 738         { Aux3, { 0.0f, 0.0f, 0.0f, 1.0f } },
 739     };
 740     static const enum Channel AmbiChannels[MAX_OUTPUT_CHANNELS] = {
 741         Aux0, Aux1, Aux2, Aux3, InvalidChannel
 742     };
 743
 744     memset(slot->AmbiCoeffs, 0, sizeof(slot->AmbiCoeffs));
 745     slot->NumChannels = 0;
 746
 747     SetChannelMap(AmbiChannels, slot->AmbiCoeffs, FirstOrderN3D, COUNTOF(FirstOrderN3D),
 748                   &slot->NumChannels, AL_FALSE);
 749 }