OpenAL32/Include/alu.h

   1 #ifndef _ALU_H_
   2 #define _ALU_H_
   3
   4 #include <limits.h>
   5 #include <math.h>
   6 #ifdef HAVE_FLOAT_H
   7 #include <float.h>
   8 #endif
   9 #ifdef HAVE_IEEEFP_H
  10 #include <ieeefp.h>
  11 #endif
  12
  13 #include "alMain.h"
  14 #include "alBuffer.h"
  15
  16 #include "hrtf.h"
  17 #include "align.h"
  18 #include "math_defs.h"
  19 #include "filters/defs.h"
  20 #include "filters/nfc.h"
  21
  22
  23 #define MAX_PITCH  (255)
  24
  25 /* Maximum number of samples to pad on either end of a buffer for resampling.
  26  * Note that both the beginning and end need padding!
  27  */
  28 #define MAX_RESAMPLE_PADDING 24
  29
  30
  31 #ifdef __cplusplus
  32 extern "C" {
  33 #endif
  34
  35 struct BSincTable;
  36 struct ALsource;
  37 struct ALbufferlistitem;
  38 struct ALvoice;
  39 struct ALeffectslot;
  40
  41
  42 #define DITHER_RNG_SEED 22222
  43
  44
  45 enum SpatializeMode {
  46     SpatializeOff = AL_FALSE,
  47     SpatializeOn = AL_TRUE,
  48     SpatializeAuto = AL_AUTO_SOFT
  49 };
  50
  51 enum Resampler {
  52     PointResampler,
  53     LinearResampler,
  54     FIR4Resampler,
  55     BSinc12Resampler,
  56     BSinc24Resampler,
  57
  58     ResamplerMax = BSinc24Resampler
  59 };
  60 extern enum Resampler ResamplerDefault;
  61
  62 /* The number of distinct scale and phase intervals within the bsinc filter
  63  * table.
  64  */
  65 #define BSINC_SCALE_BITS  4
  66 #define BSINC_SCALE_COUNT (1<<BSINC_SCALE_BITS)
  67 #define BSINC_PHASE_BITS  4
  68 #define BSINC_PHASE_COUNT (1<<BSINC_PHASE_BITS)
  69
  70 /* Interpolator state.  Kind of a misnomer since the interpolator itself is
  71  * stateless.  This just keeps it from having to recompute scale-related
  72  * mappings for every sample.
  73  */
  74 typedef struct BsincState {
  75     ALfloat sf; /* Scale interpolation factor. */
  76     ALsizei m;  /* Coefficient count. */
  77     ALsizei l;  /* Left coefficient offset. */
  78     /* Filter coefficients, followed by the scale, phase, and scale-phase
  79      * delta coefficients. Starting at phase index 0, each subsequent phase
  80      * index follows contiguously.
  81      */
  82     const ALfloat *filter;
  83 } BsincState;
  84
  85 typedef union InterpState {
  86     BsincState bsinc;
  87 } InterpState;
  88
  89 typedef const ALfloat* (*ResamplerFunc)(const InterpState *state,
  90     const ALfloat *restrict src, ALsizei frac, ALint increment,
  91     ALfloat *restrict dst, ALsizei dstlen
  92 );
  93
  94 void BsincPrepare(const ALuint increment, BsincState *state, const struct BSincTable *table);
  95
  96 extern const struct BSincTable bsinc12;
  97 extern const struct BSincTable bsinc24;
  98
  99
 100 typedef union aluVector {
 101     alignas(16) ALfloat v[4];
 102 } aluVector;
 103
 104 inline void aluVectorSet(aluVector *vector, ALfloat x, ALfloat y, ALfloat z, ALfloat w)
 105 {
 106     vector->v[0] = x;
 107     vector->v[1] = y;
 108     vector->v[2] = z;
 109     vector->v[3] = w;
 110 }
 111
 112
 113 typedef union aluMatrixf {
 114     alignas(16) ALfloat m[4][4];
 115 } aluMatrixf;
 116 extern const aluMatrixf IdentityMatrixf;
 117
 118 inline void aluMatrixfSetRow(aluMatrixf *matrix, ALuint row,
 119                              ALfloat m0, ALfloat m1, ALfloat m2, ALfloat m3)
 120 {
 121     matrix->m[row][0] = m0;
 122     matrix->m[row][1] = m1;
 123     matrix->m[row][2] = m2;
 124     matrix->m[row][3] = m3;
 125 }
 126
 127 inline void aluMatrixfSet(aluMatrixf *matrix, ALfloat m00, ALfloat m01, ALfloat m02, ALfloat m03,
 128                                               ALfloat m10, ALfloat m11, ALfloat m12, ALfloat m13,
 129                                               ALfloat m20, ALfloat m21, ALfloat m22, ALfloat m23,
 130                                               ALfloat m30, ALfloat m31, ALfloat m32, ALfloat m33)
 131 {
 132     aluMatrixfSetRow(matrix, 0, m00, m01, m02, m03);
 133     aluMatrixfSetRow(matrix, 1, m10, m11, m12, m13);
 134     aluMatrixfSetRow(matrix, 2, m20, m21, m22, m23);
 135     aluMatrixfSetRow(matrix, 3, m30, m31, m32, m33);
 136 }
 137
 138
 139 enum ActiveFilters {
 140     AF_None = 0,
 141     AF_LowPass = 1,
 142     AF_HighPass = 2,
 143     AF_BandPass = AF_LowPass | AF_HighPass
 144 };
 145
 146
 147 typedef struct MixHrtfParams {
 148     const ALfloat (*Coeffs)[2];
 149     ALsizei Delay[2];
 150     ALfloat Gain;
 151     ALfloat GainStep;
 152 } MixHrtfParams;
 153
 154
 155 typedef struct DirectParams {
 156     BiquadFilter LowPass;
 157     BiquadFilter HighPass;
 158
 159     NfcFilter NFCtrlFilter;
 160
 161     struct {
 162         HrtfParams Old;
 163         HrtfParams Target;
 164         HrtfState State;
 165     } Hrtf;
 166
 167     struct {
 168         ALfloat Current[MAX_OUTPUT_CHANNELS];
 169         ALfloat Target[MAX_OUTPUT_CHANNELS];
 170     } Gains;
 171 } DirectParams;
 172
 173 typedef struct SendParams {
 174     BiquadFilter LowPass;
 175     BiquadFilter HighPass;
 176
 177     struct {
 178         ALfloat Current[MAX_OUTPUT_CHANNELS];
 179         ALfloat Target[MAX_OUTPUT_CHANNELS];
 180     } Gains;
 181 } SendParams;
 182
 183
 184 struct ALvoiceProps {
 185     ATOMIC(struct ALvoiceProps*) next;
 186
 187     ALfloat Pitch;
 188     ALfloat Gain;
 189     ALfloat OuterGain;
 190     ALfloat MinGain;
 191     ALfloat MaxGain;
 192     ALfloat InnerAngle;
 193     ALfloat OuterAngle;
 194     ALfloat RefDistance;
 195     ALfloat MaxDistance;
 196     ALfloat RolloffFactor;
 197     ALfloat Position[3];
 198     ALfloat Velocity[3];
 199     ALfloat Direction[3];
 200     ALfloat Orientation[2][3];
 201     ALboolean HeadRelative;
 202     enum DistanceModel DistanceModel;
 203     enum Resampler Resampler;
 204     ALboolean DirectChannels;
 205     enum SpatializeMode SpatializeMode;
 206
 207     ALboolean DryGainHFAuto;
 208     ALboolean WetGainAuto;
 209     ALboolean WetGainHFAuto;
 210     ALfloat   OuterGainHF;
 211
 212     ALfloat AirAbsorptionFactor;
 213     ALfloat RoomRolloffFactor;
 214     ALfloat DopplerFactor;
 215
 216     ALfloat StereoPan[2];
 217
 218     ALfloat Radius;
 219
 220     /** Direct filter and auxiliary send info. */
 221     struct {
 222         ALfloat Gain;
 223         ALfloat GainHF;
 224         ALfloat HFReference;
 225         ALfloat GainLF;
 226         ALfloat LFReference;
 227     } Direct;
 228     struct {
 229         struct ALeffectslot *Slot;
 230         ALfloat Gain;
 231         ALfloat GainHF;
 232         ALfloat HFReference;
 233         ALfloat GainLF;
 234         ALfloat LFReference;
 235     } Send[];
 236 };
 237
 238 #define VOICE_IS_STATIC (1<<0)
 239 #define VOICE_IS_FADING (1<<1) /* Fading sources use gain stepping for smooth transitions. */
 240 #define VOICE_HAS_HRTF  (1<<2)
 241 #define VOICE_HAS_NFC   (1<<3)
 242
 243 typedef struct ALvoice {
 244     struct ALvoiceProps *Props;
 245
 246     ATOMIC(struct ALvoiceProps*) Update;
 247
 248     ATOMIC(struct ALsource*) Source;
 249     ATOMIC(bool) Playing;
 250
 251     /**
 252      * Source offset in samples, relative to the currently playing buffer, NOT
 253      * the whole queue, and the fractional (fixed-point) offset to the next
 254      * sample.
 255      */
 256     ATOMIC(ALuint) position;
 257     ATOMIC(ALsizei) position_fraction;
 258
 259     /* Current buffer queue item being played. */
 260     ATOMIC(struct ALbufferlistitem*) current_buffer;
 261
 262     /* Buffer queue item to loop to at end of queue (will be NULL for non-
 263      * looping voices).
 264      */
 265     ATOMIC(struct ALbufferlistitem*) loop_buffer;
 266
 267     /**
 268      * Number of channels and bytes-per-sample for the attached source's
 269      * buffer(s).
 270      */
 271     ALsizei NumChannels;
 272     ALsizei SampleSize;
 273
 274     /** Current target parameters used for mixing. */
 275     ALint Step;
 276
 277     ResamplerFunc Resampler;
 278
 279     ALuint Flags;
 280
 281     ALuint Offset; /* Number of output samples mixed since starting. */
 282
 283     alignas(16) ALfloat PrevSamples[MAX_INPUT_CHANNELS][MAX_RESAMPLE_PADDING];
 284
 285     InterpState ResampleState;
 286
 287     struct {
 288         enum ActiveFilters FilterType;
 289         DirectParams Params[MAX_INPUT_CHANNELS];
 290
 291         ALfloat (*Buffer)[BUFFERSIZE];
 292         ALsizei Channels;
 293         ALsizei ChannelsPerOrder[MAX_AMBI_ORDER+1];
 294     } Direct;
 295
 296     struct {
 297         enum ActiveFilters FilterType;
 298         SendParams Params[MAX_INPUT_CHANNELS];
 299
 300         ALfloat (*Buffer)[BUFFERSIZE];
 301         ALsizei Channels;
 302     } Send[];
 303 } ALvoice;
 304
 305 void DeinitVoice(ALvoice *voice);
 306
 307
 308 typedef void (*MixerFunc)(const ALfloat *data, ALsizei OutChans,
 309                           ALfloat (*restrict OutBuffer)[BUFFERSIZE], ALfloat *CurrentGains,
 310                           const ALfloat *TargetGains, ALsizei Counter, ALsizei OutPos,
 311                           ALsizei BufferSize);
 312 typedef void (*RowMixerFunc)(ALfloat *OutBuffer, const ALfloat *gains,
 313                              const ALfloat (*restrict data)[BUFFERSIZE], ALsizei InChans,
 314                              ALsizei InPos, ALsizei BufferSize);
 315 typedef void (*HrtfMixerFunc)(ALfloat *restrict LeftOut, ALfloat *restrict RightOut,
 316                               const ALfloat *data, ALsizei Offset, ALsizei OutPos,
 317                               const ALsizei IrSize, MixHrtfParams *hrtfparams,
 318                               HrtfState *hrtfstate, ALsizei BufferSize);
 319 typedef void (*HrtfMixerBlendFunc)(ALfloat *restrict LeftOut, ALfloat *restrict RightOut,
 320                                    const ALfloat *data, ALsizei Offset, ALsizei OutPos,
 321                                    const ALsizei IrSize, const HrtfParams *oldparams,
 322                                    MixHrtfParams *newparams, HrtfState *hrtfstate,
 323                                    ALsizei BufferSize);
 324 typedef void (*HrtfDirectMixerFunc)(ALfloat *restrict LeftOut, ALfloat *restrict RightOut,
 325                                     const ALfloat *data, ALsizei Offset, const ALsizei IrSize,
 326                                     const ALfloat (*restrict Coeffs)[2],
 327                                     ALfloat (*restrict Values)[2], ALsizei BufferSize);
 328
 329
 330 #define GAIN_MIX_MAX  (16.0f) /* +24dB */
 331
 332 #define GAIN_SILENCE_THRESHOLD  (0.00001f) /* -100dB */
 333
 334 #define SPEEDOFSOUNDMETRESPERSEC  (343.3f)
 335 #define AIRABSORBGAINHF           (0.99426f) /* -0.05dB */
 336
 337 /* Target gain for the reverb decay feedback reaching the decay time. */
 338 #define REVERB_DECAY_GAIN  (0.001f) /* -60 dB */
 339
 340 #define FRACTIONBITS (12)
 341 #define FRACTIONONE  (1<<FRACTIONBITS)
 342 #define FRACTIONMASK (FRACTIONONE-1)
 343
 344
 345 inline ALfloat minf(ALfloat a, ALfloat b)
 346 { return ((a > b) ? b : a); }
 347 inline ALfloat maxf(ALfloat a, ALfloat b)
 348 { return ((a > b) ? a : b); }
 349 inline ALfloat clampf(ALfloat val, ALfloat min, ALfloat max)
 350 { return minf(max, maxf(min, val)); }
 351
 352 inline ALdouble mind(ALdouble a, ALdouble b)
 353 { return ((a > b) ? b : a); }
 354 inline ALdouble maxd(ALdouble a, ALdouble b)
 355 { return ((a > b) ? a : b); }
 356 inline ALdouble clampd(ALdouble val, ALdouble min, ALdouble max)
 357 { return mind(max, maxd(min, val)); }
 358
 359 inline ALuint minu(ALuint a, ALuint b)
 360 { return ((a > b) ? b : a); }
 361 inline ALuint maxu(ALuint a, ALuint b)
 362 { return ((a > b) ? a : b); }
 363 inline ALuint clampu(ALuint val, ALuint min, ALuint max)
 364 { return minu(max, maxu(min, val)); }
 365
 366 inline ALint mini(ALint a, ALint b)
 367 { return ((a > b) ? b : a); }
 368 inline ALint maxi(ALint a, ALint b)
 369 { return ((a > b) ? a : b); }
 370 inline ALint clampi(ALint val, ALint min, ALint max)
 371 { return mini(max, maxi(min, val)); }
 372
 373 inline ALint64 mini64(ALint64 a, ALint64 b)
 374 { return ((a > b) ? b : a); }
 375 inline ALint64 maxi64(ALint64 a, ALint64 b)
 376 { return ((a > b) ? a : b); }
 377 inline ALint64 clampi64(ALint64 val, ALint64 min, ALint64 max)
 378 { return mini64(max, maxi64(min, val)); }
 379
 380 inline ALuint64 minu64(ALuint64 a, ALuint64 b)
 381 { return ((a > b) ? b : a); }
 382 inline ALuint64 maxu64(ALuint64 a, ALuint64 b)
 383 { return ((a > b) ? a : b); }
 384 inline ALuint64 clampu64(ALuint64 val, ALuint64 min, ALuint64 max)
 385 { return minu64(max, maxu64(min, val)); }
 386
 387 inline size_t minz(size_t a, size_t b)
 388 { return ((a > b) ? b : a); }
 389 inline size_t maxz(size_t a, size_t b)
 390 { return ((a > b) ? a : b); }
 391 inline size_t clampz(size_t val, size_t min, size_t max)
 392 { return minz(max, maxz(min, val)); }
 393
 394
 395 inline ALfloat lerp(ALfloat val1, ALfloat val2, ALfloat mu)
 396 {
 397     return val1 + (val2-val1)*mu;
 398 }
 399 inline ALfloat cubic(ALfloat val1, ALfloat val2, ALfloat val3, ALfloat val4, ALfloat mu)
 400 {
 401     ALfloat mu2 = mu*mu, mu3 = mu2*mu;
 402     ALfloat a0 = -0.5f*mu3 +       mu2 + -0.5f*mu;
 403     ALfloat a1 =  1.5f*mu3 + -2.5f*mu2            + 1.0f;
 404     ALfloat a2 = -1.5f*mu3 +  2.0f*mu2 +  0.5f*mu;
 405     ALfloat a3 =  0.5f*mu3 + -0.5f*mu2;
 406     return val1*a0 + val2*a1 + val3*a2 + val4*a3;
 407 }
 408
 409
 410 enum HrtfRequestMode {
 411     Hrtf_Default = 0,
 412     Hrtf_Enable = 1,
 413     Hrtf_Disable = 2,
 414 };
 415
 416 void aluInit(void);
 417
 418 void aluInitMixer(void);
 419
 420 ResamplerFunc SelectResampler(enum Resampler resampler);
 421
 422 /* aluInitRenderer
 423  *
 424  * Set up the appropriate panning method and mixing method given the device
 425  * properties.
 426  */
 427 void aluInitRenderer(ALCdevice *device, ALint hrtf_id, enum HrtfRequestMode hrtf_appreq, enum HrtfRequestMode hrtf_userreq);
 428
 429 void aluInitEffectPanning(struct ALeffectslot *slot);
 430
 431 void aluSelectPostProcess(ALCdevice *device);
 432
 433 /**
 434  * Calculates ambisonic encoder coefficients using the X, Y, and Z direction
 435  * components, which must represent a normalized (unit length) vector, and the
 436  * spread is the angular width of the sound (0...tau).
 437  *
 438  * NOTE: The components use ambisonic coordinates. As a result:
 439  *
 440  * Ambisonic Y = OpenAL -X
 441  * Ambisonic Z = OpenAL Y
 442  * Ambisonic X = OpenAL -Z
 443  *
 444  * The components are ordered such that OpenAL's X, Y, and Z are the first,
 445  * second, and third parameters respectively -- simply negate X and Z.
 446  */
 447 void CalcAmbiCoeffs(const ALfloat y, const ALfloat z, const ALfloat x, const ALfloat spread,
 448                     ALfloat coeffs[MAX_AMBI_COEFFS]);
 449
 450 /**
 451  * CalcDirectionCoeffs
 452  *
 453  * Calculates ambisonic coefficients based on an OpenAL direction vector. The
 454  * vector must be normalized (unit length), and the spread is the angular width
 455  * of the sound (0...tau).
 456  */
 457 inline void CalcDirectionCoeffs(const ALfloat dir[3], ALfloat spread, ALfloat coeffs[MAX_AMBI_COEFFS])
 458 {
 459     /* Convert from OpenAL coords to Ambisonics. */
 460     CalcAmbiCoeffs(-dir[0], dir[1], -dir[2], spread, coeffs);
 461 }
 462
 463 /**
 464  * CalcAngleCoeffs
 465  *
 466  * Calculates ambisonic coefficients based on azimuth and elevation. The
 467  * azimuth and elevation parameters are in radians, going right and up
 468  * respectively.
 469  */
 470 inline void CalcAngleCoeffs(ALfloat azimuth, ALfloat elevation, ALfloat spread, ALfloat coeffs[MAX_AMBI_COEFFS])
 471 {
 472     ALfloat x = -sinf(azimuth) * cosf(elevation);
 473     ALfloat y = sinf(elevation);
 474     ALfloat z = cosf(azimuth) * cosf(elevation);
 475
 476     CalcAmbiCoeffs(x, y, z, spread, coeffs);
 477 }
 478
 479 /**
 480  * ScaleAzimuthFront
 481  *
 482  * Scales the given azimuth toward the side (+/- pi/2 radians) for positions in
 483  * front.
 484  */
 485 inline float ScaleAzimuthFront(float azimuth, float scale)
 486 {
 487     ALfloat sign = copysignf(1.0f, azimuth);
 488     if(!(fabsf(azimuth) > F_PI_2))
 489         return minf(fabsf(azimuth) * scale, F_PI_2) * sign;
 490     return azimuth;
 491 }
 492
 493
 494 void ComputePanningGainsMC(const ChannelConfig *chancoeffs, ALsizei numchans, ALsizei numcoeffs, const ALfloat*restrict coeffs, ALfloat ingain, ALfloat gains[MAX_OUTPUT_CHANNELS]);
 495 void ComputePanningGainsBF(const BFChannelConfig *chanmap, ALsizei numchans, const ALfloat*restrict coeffs, ALfloat ingain, ALfloat gains[MAX_OUTPUT_CHANNELS]);
 496
 497 /**
 498  * ComputeDryPanGains
 499  *
 500  * Computes panning gains using the given channel decoder coefficients and the
 501  * pre-calculated direction or angle coefficients.
 502  */
 503 inline void ComputeDryPanGains(const MixParams *dry, const ALfloat coeffs[MAX_AMBI_COEFFS], ALfloat ingain, ALfloat gains[MAX_OUTPUT_CHANNELS])
 504 {
 505     if(dry->CoeffCount > 0)
 506         ComputePanningGainsMC(dry->Ambi.Coeffs, dry->NumChannels, dry->CoeffCount,
 507                               coeffs, ingain, gains);
 508     else
 509         ComputePanningGainsBF(dry->Ambi.Map, dry->NumChannels, coeffs, ingain, gains);
 510 }
 511 /**
 512  * ComputeFirstOrderGains
 513  *
 514  * Sets channel gains for a first-order ambisonics input channel. The matrix is
 515  * a 1x4 'slice' of a transform matrix for the input channel, used to scale and
 516  * orient the sound samples.
 517  */
 518 inline void ComputeFirstOrderGains(const MixParams *foa, const ALfloat mtx[4], ALfloat ingain, ALfloat gains[MAX_OUTPUT_CHANNELS])
 519 {
 520     if(foa->CoeffCount > 0)
 521         ComputePanningGainsMC(foa->Ambi.Coeffs, foa->NumChannels, 4, mtx, ingain, gains);
 522     else
 523         ComputePanningGainsBF(foa->Ambi.Map, foa->NumChannels, mtx, ingain, gains);
 524 }
 525
 526
 527 ALboolean MixSource(struct ALvoice *voice, ALuint SourceID, ALCcontext *Context, ALsizei SamplesToDo);
 528
 529 void aluMixData(ALCdevice *device, ALvoid *OutBuffer, ALsizei NumSamples);
 530 /* Caller must lock the device, and the mixer must not be running. */
 531 void aluHandleDisconnect(ALCdevice *device, const char *msg, ...) DECL_FORMAT(printf, 2, 3);
 532
 533 void UpdateContextProps(ALCcontext *context);
 534
 535 extern MixerFunc MixSamples;
 536 extern RowMixerFunc MixRowSamples;
 537
 538 extern ALfloat ConeScale;
 539 extern ALfloat ZScale;
 540 extern ALboolean OverrideReverbSpeedOfSound;
 541
 542 #ifdef __cplusplus
 543 }
 544 #endif
 545
 546 #endif