Alc/ALu.c

   1 /**
   2  * OpenAL cross platform audio library
   3  * Copyright (C) 1999-2007 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., 59 Temple Place - Suite 330,
  17  *  Boston, MA  02111-1307, USA.
  18  * Or go to http://www.gnu.org/copyleft/lgpl.html
  19  */
  20
  21 #define _CRT_SECURE_NO_DEPRECATE // get rid of sprintf security warnings on VS2005
  22
  23 #include "config.h"
  24
  25 #include <math.h>
  26 #include "alMain.h"
  27 #include "AL/al.h"
  28 #include "AL/alc.h"
  29
  30 #if defined(HAVE_STDINT_H)
  31 #include <stdint.h>
  32 typedef int64_t ALint64;
  33 #elif defined(HAVE___INT64)
  34 typedef __int64 ALint64;
  35 #elif (SIZEOF_LONG == 8)
  36 typedef long ALint64;
  37 #elif (SIZEOF_LONG_LONG == 8)
  38 typedef long long ALint64;
  39 #endif
  40
  41 #ifdef HAVE_SQRTF
  42 #define aluSqrt(x) ((ALfloat)sqrtf((float)(x)))
  43 #else
  44 #define aluSqrt(x) ((ALfloat)sqrt((double)(x)))
  45 #endif
  46
  47 // fixes for mingw32.
  48 #if defined(max) && !defined(__max)
  49 #define __max max
  50 #endif
  51 #if defined(min) && !defined(__min)
  52 #define __min min
  53 #endif
  54
  55 __inline ALuint aluBytesFromFormat(ALenum format)
  56 {
  57     switch(format)
  58     {
  59         case AL_FORMAT_MONO8:
  60         case AL_FORMAT_STEREO8:
  61         case AL_FORMAT_QUAD8:
  62             return 1;
  63
  64         case AL_FORMAT_MONO16:
  65         case AL_FORMAT_STEREO16:
  66         case AL_FORMAT_QUAD16:
  67             return 2;
  68
  69         default:
  70             return 0;
  71     }
  72 }
  73
  74 __inline ALuint aluChannelsFromFormat(ALenum format)
  75 {
  76     switch(format)
  77     {
  78         case AL_FORMAT_MONO8:
  79         case AL_FORMAT_MONO16:
  80             return 1;
  81
  82         case AL_FORMAT_STEREO8:
  83         case AL_FORMAT_STEREO16:
  84             return 2;
  85
  86         case AL_FORMAT_QUAD8:
  87         case AL_FORMAT_QUAD16:
  88             return 4;
  89
  90         default:
  91             return 0;
  92     }
  93 }
  94
  95 static __inline ALint aluF2L(ALfloat Value)
  96 {
  97     if(sizeof(ALint) == 4 && sizeof(double) == 8)
  98     {
  99         double temp;
 100         temp = Value + (((65536.0*65536.0*16.0)+(65536.0*65536.0*8.0))*65536.0);
 101         return *((ALint*)&temp);
 102     }
 103     return (ALint)Value;
 104 }
 105
 106 static __inline ALshort aluF2S(ALfloat Value)
 107 {
 108     ALint i;
 109
 110     i = aluF2L(Value);
 111     i = __min( 32767, i);
 112     i = __max(-32768, i);
 113     return ((ALshort)i);
 114 }
 115
 116 static __inline ALvoid aluCrossproduct(ALfloat *inVector1,ALfloat *inVector2,ALfloat *outVector)
 117 {
 118     outVector[0] = inVector1[1]*inVector2[2] - inVector1[2]*inVector2[1];
 119     outVector[1] = inVector1[2]*inVector2[0] - inVector1[0]*inVector2[2];
 120     outVector[2] = inVector1[0]*inVector2[1] - inVector1[1]*inVector2[0];
 121 }
 122
 123 static __inline ALfloat aluDotproduct(ALfloat *inVector1,ALfloat *inVector2)
 124 {
 125     return inVector1[0]*inVector2[0] + inVector1[1]*inVector2[1] +
 126            inVector1[2]*inVector2[2];
 127 }
 128
 129 static __inline ALvoid aluNormalize(ALfloat *inVector)
 130 {
 131     ALfloat length, inverse_length;
 132
 133     length = (ALfloat)aluSqrt(aluDotproduct(inVector, inVector));
 134     if(length != 0)
 135     {
 136         inverse_length = 1.0f/length;
 137         inVector[0] *= inverse_length;
 138         inVector[1] *= inverse_length;
 139         inVector[2] *= inverse_length;
 140     }
 141 }
 142
 143 static __inline ALvoid aluMatrixVector(ALfloat *vector,ALfloat matrix[3][3])
 144 {
 145     ALfloat result[3];
 146
 147     result[0] = vector[0]*matrix[0][0] + vector[1]*matrix[1][0] + vector[2]*matrix[2][0];
 148     result[1] = vector[0]*matrix[0][1] + vector[1]*matrix[1][1] + vector[2]*matrix[2][1];
 149     result[2] = vector[0]*matrix[0][2] + vector[1]*matrix[1][2] + vector[2]*matrix[2][2];
 150     memcpy(vector, result, sizeof(result));
 151 }
 152
 153 static __inline ALfloat aluComputeDrySample(ALsource *source, ALfloat DryGainHF, ALfloat sample)
 154 {
 155     if(DryGainHF < 1.0f)
 156     {
 157         sample *= DryGainHF;
 158         sample += source->LastDrySample * (1.0f - DryGainHF);
 159     }
 160
 161     source->LastDrySample = sample;
 162     return sample;
 163 }
 164
 165 static __inline ALfloat aluComputeWetSample(ALsource *source, ALfloat WetGainHF, ALfloat sample)
 166 {
 167     if(WetGainHF < 1.0f)
 168     {
 169         sample *= WetGainHF;
 170         sample += source->LastWetSample * (1.0f - WetGainHF);
 171     }
 172
 173     source->LastWetSample = sample;
 174     return sample;
 175 }
 176
 177 static ALvoid CalcSourceParams(ALCcontext *ALContext, ALsource *ALSource,
 178                                ALenum isMono, ALenum OutputFormat,
 179                                ALfloat *drysend, ALfloat *wetsend,
 180                                ALfloat *pitch, ALfloat *drygainhf,
 181                                ALfloat *wetgainhf)
 182 {
 183     ALfloat ListenerOrientation[6],ListenerPosition[3],ListenerVelocity[3];
 184     ALfloat InnerAngle,OuterAngle,OuterGain,Angle,Distance,DryMix,WetMix;
 185     ALfloat Direction[3],Position[3],Velocity[3],SourceToListener[3];
 186     ALfloat MinVolume,MaxVolume,MinDist,MaxDist,Rolloff,OuterGainHF;
 187     ALfloat Pitch,ConeVolume,SourceVolume,PanningFB,PanningLR,ListenerGain;
 188     ALfloat U[3],V[3],N[3];
 189     ALfloat DopplerFactor, DopplerVelocity, flSpeedOfSound, flMaxVelocity;
 190     ALfloat flVSS, flVLS;
 191     ALint DistanceModel;
 192     ALfloat Matrix[3][3];
 193     ALint HeadRelative;
 194     ALfloat flAttenuation;
 195     ALfloat MetersPerUnit;
 196     ALfloat DryGainHF = 1.0f;
 197     ALfloat WetGainHF = 1.0f;
 198
 199     //Get context properties
 200     DopplerFactor   = ALContext->DopplerFactor;
 201     DistanceModel   = ALContext->DistanceModel;
 202     DopplerVelocity = ALContext->DopplerVelocity;
 203     flSpeedOfSound  = ALContext->flSpeedOfSound;
 204
 205     //Get listener properties
 206     ListenerGain = ALContext->Listener.Gain;
 207     MetersPerUnit = ALContext->Listener.MetersPerUnit;
 208     memcpy(ListenerPosition, ALContext->Listener.Position, sizeof(ALContext->Listener.Position));
 209     memcpy(ListenerVelocity, ALContext->Listener.Velocity, sizeof(ALContext->Listener.Velocity));
 210     memcpy(&ListenerOrientation[0], ALContext->Listener.Forward, sizeof(ALContext->Listener.Forward));
 211     memcpy(&ListenerOrientation[3], ALContext->Listener.Up, sizeof(ALContext->Listener.Up));
 212
 213     //Get source properties
 214     Pitch        = ALSource->flPitch;
 215     SourceVolume = ALSource->flGain;
 216     memcpy(Position,  ALSource->vPosition,    sizeof(ALSource->vPosition));
 217     memcpy(Velocity,  ALSource->vVelocity,    sizeof(ALSource->vVelocity));
 218     memcpy(Direction, ALSource->vOrientation, sizeof(ALSource->vOrientation));
 219     MinVolume    = ALSource->flMinGain;
 220     MaxVolume    = ALSource->flMaxGain;
 221     MinDist      = ALSource->flRefDistance;
 222     MaxDist      = ALSource->flMaxDistance;
 223     Rolloff      = ALSource->flRollOffFactor;
 224     OuterGain    = ALSource->flOuterGain;
 225     InnerAngle   = ALSource->flInnerAngle;
 226     OuterAngle   = ALSource->flOuterAngle;
 227     HeadRelative = ALSource->bHeadRelative;
 228     OuterGainHF  = (ALSource->DryGainHFAuto ? ALSource->OuterGainHF : 1.0f);
 229
 230     //Set working variables
 231     DryMix = (ALfloat)(1.0f);
 232     WetMix = (ALfloat)(0.0f);
 233
 234     //Only apply 3D calculations for mono buffers
 235     if(isMono != AL_FALSE)
 236     {
 237         //1. Translate Listener to origin (convert to head relative)
 238         if(HeadRelative==AL_FALSE)
 239         {
 240             Position[0] -= ListenerPosition[0];
 241             Position[1] -= ListenerPosition[1];
 242             Position[2] -= ListenerPosition[2];
 243         }
 244
 245         //2. Calculate distance attenuation
 246         Distance = aluSqrt(aluDotproduct(Position, Position));
 247
 248         flAttenuation = 1.0f;
 249         switch (DistanceModel)
 250         {
 251             case AL_INVERSE_DISTANCE_CLAMPED:
 252                 Distance=__max(Distance,MinDist);
 253                 Distance=__min(Distance,MaxDist);
 254                 if (MaxDist < MinDist)
 255                     break;
 256                 //fall-through
 257             case AL_INVERSE_DISTANCE:
 258                 if (MinDist > 0.0f)
 259                 {
 260                     if ((MinDist + (Rolloff * (Distance - MinDist))) > 0.0f)
 261                         flAttenuation = MinDist / (MinDist + (Rolloff * (Distance - MinDist)));
 262                 }
 263                 break;
 264
 265             case AL_LINEAR_DISTANCE_CLAMPED:
 266                 Distance=__max(Distance,MinDist);
 267                 Distance=__min(Distance,MaxDist);
 268                 if (MaxDist < MinDist)
 269                     break;
 270                 //fall-through
 271             case AL_LINEAR_DISTANCE:
 272                 Distance=__min(Distance,MaxDist);
 273                 if (MaxDist != MinDist)
 274                     flAttenuation = 1.0f - (Rolloff*(Distance-MinDist)/(MaxDist - MinDist));
 275                 break;
 276
 277             case AL_EXPONENT_DISTANCE_CLAMPED:
 278                 Distance=__max(Distance,MinDist);
 279                 Distance=__min(Distance,MaxDist);
 280                 if (MaxDist < MinDist)
 281                     break;
 282                 //fall-through
 283             case AL_EXPONENT_DISTANCE:
 284                 if ((Distance > 0.0f) && (MinDist > 0.0f))
 285                     flAttenuation = (ALfloat)pow(Distance/MinDist, -Rolloff);
 286                 break;
 287
 288             case AL_NONE:
 289             default:
 290                 flAttenuation = 1.0f;
 291                 break;
 292         }
 293
 294         // Source Gain + Attenuation
 295         DryMix = SourceVolume * flAttenuation;
 296
 297         // Clamp to Min/Max Gain
 298         DryMix = __min(DryMix,MaxVolume);
 299         DryMix = __max(DryMix,MinVolume);
 300         WetMix = __min(WetMix,MaxVolume);
 301         WetMix = __max(WetMix,MinVolume);
 302         //3. Apply directional soundcones
 303         SourceToListener[0] = -Position[0];
 304         SourceToListener[1] = -Position[1];
 305         SourceToListener[2] = -Position[2];
 306         aluNormalize(Direction);
 307         aluNormalize(SourceToListener);
 308         Angle = (ALfloat)(180.0*acos(aluDotproduct(Direction,SourceToListener))/3.141592654f);
 309         if(Angle >= InnerAngle && Angle <= OuterAngle)
 310         {
 311             ALfloat scale = (Angle-InnerAngle) / (OuterAngle-InnerAngle);
 312             ConeVolume = (1.0f+(OuterGain-1.0f)*scale);
 313             DryGainHF *= (1.0f+(OuterGainHF-1.0f)*scale);
 314         }
 315         else if(Angle > OuterAngle)
 316         {
 317             ConeVolume = (1.0f+(OuterGain-1.0f));
 318             DryGainHF *= (1.0f+(OuterGainHF-1.0f));
 319         }
 320         else
 321             ConeVolume = 1.0f;
 322
 323         //4. Calculate Velocity
 324         if(DopplerFactor != 0.0f)
 325         {
 326             flVLS = aluDotproduct(ListenerVelocity, SourceToListener);
 327             flVSS = aluDotproduct(Velocity, SourceToListener);
 328
 329             flMaxVelocity = (DopplerVelocity * flSpeedOfSound) / DopplerFactor;
 330
 331             if (flVSS >= flMaxVelocity)
 332                 flVSS = (flMaxVelocity - 1.0f);
 333             else if (flVSS <= -flMaxVelocity)
 334                 flVSS = -flMaxVelocity + 1.0f;
 335
 336             if (flVLS >= flMaxVelocity)
 337                 flVLS = (flMaxVelocity - 1.0f);
 338             else if (flVLS <= -flMaxVelocity)
 339                 flVLS = -flMaxVelocity + 1.0f;
 340
 341             pitch[0] = Pitch * ((flSpeedOfSound * DopplerVelocity) - (DopplerFactor * flVLS)) /
 342                                ((flSpeedOfSound * DopplerVelocity) - (DopplerFactor * flVSS));
 343         }
 344         else
 345             pitch[0] = Pitch;
 346
 347         //5. Align coordinate system axes
 348         aluCrossproduct(&ListenerOrientation[0], &ListenerOrientation[3], U); // Right-vector
 349         aluNormalize(U);                                // Normalized Right-vector
 350         memcpy(V, &ListenerOrientation[3], sizeof(V));  // Up-vector
 351         aluNormalize(V);                                // Normalized Up-vector
 352         memcpy(N, &ListenerOrientation[0], sizeof(N));  // At-vector
 353         aluNormalize(N);                                // Normalized At-vector
 354         Matrix[0][0] = U[0]; Matrix[0][1] = V[0]; Matrix[0][2] = -N[0];
 355         Matrix[1][0] = U[1]; Matrix[1][1] = V[1]; Matrix[1][2] = -N[1];
 356         Matrix[2][0] = U[2]; Matrix[2][1] = V[2]; Matrix[2][2] = -N[2];
 357         aluMatrixVector(Position, Matrix);
 358
 359         //6. Convert normalized position into left/right front/back pannings
 360         if(Distance != 0.0f)
 361         {
 362             aluNormalize(Position);
 363             PanningLR = 0.5f + 0.5f*Position[0];
 364             PanningFB = 0.5f + 0.5f*Position[2];
 365         }
 366         else
 367         {
 368             PanningLR = 0.5f;
 369             PanningFB = 0.5f;
 370         }
 371
 372         //7. Apply filter gains and filters
 373         switch(ALSource->DirectFilter.filter)
 374         {
 375             case AL_FILTER_LOWPASS:
 376                 DryMix *= ALSource->DirectFilter.Gain;
 377                 DryGainHF *= ALSource->DirectFilter.GainHF;
 378                 break;
 379         }
 380
 381         switch(ALSource->Send[0].WetFilter.filter)
 382         {
 383             case AL_FILTER_LOWPASS:
 384                 WetMix *= ALSource->Send[0].WetFilter.Gain;
 385                 WetGainHF *= ALSource->Send[0].WetFilter.GainHF;
 386                 break;
 387         }
 388
 389         if(ALSource->AirAbsorptionFactor > 0.0f)
 390             DryGainHF *= pow(ALSource->AirAbsorptionFactor * AIRABSORBGAINHF,
 391                              Distance * MetersPerUnit);
 392
 393         *drygainhf = DryGainHF;
 394         *wetgainhf = WetGainHF;
 395
 396         //8. Convert pannings into channel volumes
 397         switch(OutputFormat)
 398         {
 399             case AL_FORMAT_MONO8:
 400             case AL_FORMAT_MONO16:
 401                 drysend[0] = ConeVolume * ListenerGain * DryMix * aluSqrt(1.0f); //Direct
 402                 drysend[1] = ConeVolume * ListenerGain * DryMix * aluSqrt(1.0f); //Direct
 403                 wetsend[0] =              ListenerGain * WetMix * aluSqrt(1.0f); //Room
 404                 wetsend[1] =              ListenerGain * WetMix * aluSqrt(1.0f); //Room
 405                 break;
 406             case AL_FORMAT_STEREO8:
 407             case AL_FORMAT_STEREO16:
 408                 drysend[0] = ConeVolume * ListenerGain * DryMix * aluSqrt(1.0f-PanningLR); //L Direct
 409                 drysend[1] = ConeVolume * ListenerGain * DryMix * aluSqrt(     PanningLR); //R Direct
 410                 wetsend[0] =              ListenerGain * WetMix * aluSqrt(1.0f-PanningLR); //L Room
 411                 wetsend[1] =              ListenerGain * WetMix * aluSqrt(     PanningLR); //R Room
 412                 break;
 413             case AL_FORMAT_QUAD8:
 414             case AL_FORMAT_QUAD16:
 415                 drysend[0] = ConeVolume * ListenerGain * DryMix * aluSqrt((1.0f-PanningLR)*(1.0f-PanningFB)); //FL Direct
 416                 drysend[1] = ConeVolume * ListenerGain * DryMix * aluSqrt((     PanningLR)*(1.0f-PanningFB)); //FR Direct
 417                 drysend[2] = ConeVolume * ListenerGain * DryMix * aluSqrt((1.0f-PanningLR)*(     PanningFB)); //BL Direct
 418                 drysend[3] = ConeVolume * ListenerGain * DryMix * aluSqrt((     PanningLR)*(     PanningFB)); //BR Direct
 419                 wetsend[0] =              ListenerGain * WetMix * aluSqrt((1.0f-PanningLR)*(1.0f-PanningFB)); //FL Room
 420                 wetsend[1] =              ListenerGain * WetMix * aluSqrt((     PanningLR)*(1.0f-PanningFB)); //FR Room
 421                 wetsend[2] =              ListenerGain * WetMix * aluSqrt((1.0f-PanningLR)*(     PanningFB)); //BL Room
 422                 wetsend[3] =              ListenerGain * WetMix * aluSqrt((     PanningLR)*(     PanningFB)); //BR Room
 423                 break;
 424             default:
 425                 break;
 426         }
 427     }
 428     else
 429     {
 430         //1. Multi-channel buffers always play "normal"
 431         drysend[0] = SourceVolume * 1.0f * ListenerGain;
 432         drysend[1] = SourceVolume * 1.0f * ListenerGain;
 433         drysend[2] = SourceVolume * 1.0f * ListenerGain;
 434         drysend[3] = SourceVolume * 1.0f * ListenerGain;
 435         wetsend[0] = SourceVolume * 0.0f * ListenerGain;
 436         wetsend[1] = SourceVolume * 0.0f * ListenerGain;
 437         wetsend[2] = SourceVolume * 0.0f * ListenerGain;
 438         wetsend[3] = SourceVolume * 0.0f * ListenerGain;
 439
 440         pitch[0] = Pitch;
 441
 442         *drygainhf = DryGainHF;
 443         *wetgainhf = WetGainHF;
 444     }
 445 }
 446
 447 ALvoid aluMixData(ALCcontext *ALContext,ALvoid *buffer,ALsizei size,ALenum format)
 448 {
 449     static float DryBuffer[BUFFERSIZE][OUTPUTCHANNELS];
 450     static float WetBuffer[BUFFERSIZE][OUTPUTCHANNELS];
 451     ALfloat DrySend[OUTPUTCHANNELS] = { 0.0f, 0.0f, 0.0f, 0.0f };
 452     ALfloat WetSend[OUTPUTCHANNELS] = { 0.0f, 0.0f, 0.0f, 0.0f };
 453     ALfloat DryGainHF = 0.0f;
 454     ALfloat WetGainHF = 0.0f;
 455     ALuint BlockAlign,BufferSize;
 456     ALuint DataSize=0,DataPosInt=0,DataPosFrac=0;
 457     ALuint Channels,Bits,Frequency,ulExtraSamples;
 458     ALfloat Pitch;
 459     ALint Looping,increment,State;
 460     ALuint Buffer,fraction;
 461     ALuint SamplesToDo;
 462     ALsource *ALSource;
 463     ALbuffer *ALBuffer;
 464     ALfloat value;
 465     ALshort *Data;
 466     ALuint i,j,k;
 467     ALbufferlistitem *BufferListItem;
 468     ALuint loop;
 469     ALint64 DataSize64,DataPos64;
 470
 471     SuspendContext(ALContext);
 472
 473     if(buffer)
 474     {
 475         //Figure output format variables
 476         BlockAlign  = aluChannelsFromFormat(format);
 477         BlockAlign *= aluBytesFromFormat(format);
 478
 479         size /= BlockAlign;
 480         while(size > 0)
 481         {
 482             //Setup variables
 483             ALSource = (ALContext ? ALContext->Source : NULL);
 484             SamplesToDo = min(size, BUFFERSIZE);
 485
 486             //Clear mixing buffer
 487             memset(DryBuffer, 0, SamplesToDo*OUTPUTCHANNELS*sizeof(ALfloat));
 488             memset(WetBuffer, 0, SamplesToDo*OUTPUTCHANNELS*sizeof(ALfloat));
 489
 490             //Actual mixing loop
 491             while(ALSource)
 492             {
 493                 j = 0;
 494                 State = ALSource->state;
 495                 while(State == AL_PLAYING && j < SamplesToDo)
 496                 {
 497                     DataSize = 0;
 498                     DataPosInt = 0;
 499                     DataPosFrac = 0;
 500
 501                     //Get buffer info
 502                     if((Buffer = ALSource->ulBufferID))
 503                     {
 504                         ALBuffer = (ALbuffer*)ALTHUNK_LOOKUPENTRY(Buffer);
 505
 506                         Data      = ALBuffer->data;
 507                         Bits      = aluBytesFromFormat(ALBuffer->format) * 8;
 508                         Channels  = aluChannelsFromFormat(ALBuffer->format);
 509                         DataSize  = ALBuffer->size;
 510                         Frequency = ALBuffer->frequency;
 511
 512                         CalcSourceParams(ALContext, ALSource,
 513                                          (Channels==1) ? AL_TRUE : AL_FALSE,
 514                                          format, DrySend, WetSend, &Pitch,
 515                                          &DryGainHF, &WetGainHF);
 516
 517
 518                         Pitch = (Pitch*Frequency) / ALContext->Frequency;
 519                         DataSize = DataSize / (Bits*Channels/8);
 520
 521                         //Get source info
 522                         DataPosInt = ALSource->position;
 523                         DataPosFrac = ALSource->position_fraction;
 524
 525                         //Compute 18.14 fixed point step
 526                         increment = aluF2L(Pitch*(1L<<FRACTIONBITS));
 527                         if(increment > (MAX_PITCH<<FRACTIONBITS))
 528                             increment = (MAX_PITCH<<FRACTIONBITS);
 529
 530                         //Figure out how many samples we can mix.
 531                         //Pitch must be <= 4 (the number below !)
 532                         DataSize64 = DataSize+MAX_PITCH;
 533                         DataSize64 <<= FRACTIONBITS;
 534                         DataPos64 = DataPosInt;
 535                         DataPos64 <<= FRACTIONBITS;
 536                         DataPos64 += DataPosFrac;
 537                         BufferSize = (ALuint)((DataSize64-DataPos64) / increment);
 538                         BufferListItem = ALSource->queue;
 539                         for(loop = 0; loop < ALSource->BuffersPlayed; loop++)
 540                         {
 541                             if(BufferListItem)
 542                                 BufferListItem = BufferListItem->next;
 543                         }
 544                         if (BufferListItem)
 545                         {
 546                             if (BufferListItem->next)
 547                             {
 548                                 if(BufferListItem->next->buffer &&
 549                                    ((ALbuffer*)ALTHUNK_LOOKUPENTRY(BufferListItem->next->buffer))->data)
 550                                 {
 551                                     ulExtraSamples = min(((ALbuffer*)ALTHUNK_LOOKUPENTRY(BufferListItem->next->buffer))->size, (ALint)(16*Channels));
 552                                     memcpy(&Data[DataSize*Channels], ((ALbuffer*)ALTHUNK_LOOKUPENTRY(BufferListItem->next->buffer))->data, ulExtraSamples);
 553                                 }
 554                             }
 555                             else if (ALSource->bLooping)
 556                             {
 557                                 if (ALSource->queue->buffer)
 558                                 {
 559                                     if(((ALbuffer*)ALTHUNK_LOOKUPENTRY(ALSource->queue->buffer))->data)
 560                                     {
 561                                         ulExtraSamples = min(((ALbuffer*)ALTHUNK_LOOKUPENTRY(ALSource->queue->buffer))->size, (ALint)(16*Channels));
 562                                         memcpy(&Data[DataSize*Channels], ((ALbuffer*)ALTHUNK_LOOKUPENTRY(ALSource->queue->buffer))->data, ulExtraSamples);
 563                                     }
 564                                 }
 565                             }
 566                         }
 567                         BufferSize = min(BufferSize, (SamplesToDo-j));
 568
 569                         //Actual sample mixing loop
 570                         Data += DataPosInt*Channels;
 571                         while(BufferSize--)
 572                         {
 573                             k = DataPosFrac>>FRACTIONBITS;
 574                             fraction = DataPosFrac&FRACTIONMASK;
 575                             if(Channels==1)
 576                             {
 577                                 //First order interpolator
 578                                 ALfloat sample = (ALfloat)((ALshort)(((Data[k]*((1L<<FRACTIONBITS)-fraction))+(Data[k+1]*(fraction)))>>FRACTIONBITS));
 579
 580                                 //Direct path final mix buffer and panning
 581                                 value = aluComputeDrySample(ALSource, DryGainHF, sample);
 582                                 DryBuffer[j][0] += value*DrySend[0];
 583                                 DryBuffer[j][1] += value*DrySend[1];
 584                                 DryBuffer[j][2] += value*DrySend[2];
 585                                 DryBuffer[j][3] += value*DrySend[3];
 586
 587                                 if(ALSource->Send[0].Slot.effectslot)
 588                                 {
 589                                     //Room path final mix buffer and panning
 590                                     value = aluComputeWetSample(ALSource, WetGainHF, sample);
 591                                     WetBuffer[j][0] += value*WetSend[0];
 592                                     WetBuffer[j][1] += value*WetSend[1];
 593                                     WetBuffer[j][2] += value*WetSend[2];
 594                                     WetBuffer[j][3] += value*WetSend[3];
 595                                 }
 596                             }
 597                             else
 598                             {
 599                                 //First order interpolator (left)
 600                                 value = (ALfloat)((ALshort)(((Data[k*2  ]*((1L<<FRACTIONBITS)-fraction))+(Data[k*2+2]*(fraction)))>>FRACTIONBITS));
 601                                 //Direct path final mix buffer and panning (left)
 602                                 DryBuffer[j][0] += value*DrySend[0];
 603                                 //Room path final mix buffer and panning (left)
 604                                 WetBuffer[j][0] += value*WetSend[0];
 605                                 //First order interpolator (right)
 606                                 value = (ALfloat)((ALshort)(((Data[k*2+1]*((1L<<FRACTIONBITS)-fraction))+(Data[k*2+3]*(fraction)))>>FRACTIONBITS));
 607                                 //Direct path final mix buffer and panning (right)
 608                                 DryBuffer[j][1] += value*DrySend[1];
 609                                 //Room path final mix buffer and panning (right)
 610                                 WetBuffer[j][1] += value*WetSend[1];
 611                             }
 612                             DataPosFrac += increment;
 613                             j++;
 614                         }
 615                         DataPosInt += (DataPosFrac>>FRACTIONBITS);
 616                         DataPosFrac = (DataPosFrac&FRACTIONMASK);
 617
 618                         //Update source info
 619                         ALSource->position = DataPosInt;
 620                         ALSource->position_fraction = DataPosFrac;
 621                     }
 622
 623                     //Handle looping sources
 624                     if(!Buffer || DataPosInt >= DataSize)
 625                     {
 626                         //queueing
 627                         if(ALSource->queue)
 628                         {
 629                             Looping = ALSource->bLooping;
 630                             if(ALSource->BuffersPlayed < (ALSource->BuffersInQueue-1))
 631                             {
 632                                 BufferListItem = ALSource->queue;
 633                                 for(loop = 0; loop <= ALSource->BuffersPlayed; loop++)
 634                                 {
 635                                     if(BufferListItem)
 636                                     {
 637                                         if(!Looping)
 638                                             BufferListItem->bufferstate = PROCESSED;
 639                                         BufferListItem = BufferListItem->next;
 640                                     }
 641                                 }
 642                                 if(!Looping)
 643                                     ALSource->BuffersProcessed++;
 644                                 if(BufferListItem)
 645                                     ALSource->ulBufferID = BufferListItem->buffer;
 646                                 ALSource->position = DataPosInt-DataSize;
 647                                 ALSource->position_fraction = DataPosFrac;
 648                                 ALSource->BuffersPlayed++;
 649                             }
 650                             else
 651                             {
 652                                 if(!Looping)
 653                                 {
 654                                     /* alSourceStop */
 655                                     ALSource->state = AL_STOPPED;
 656                                     ALSource->inuse = AL_FALSE;
 657                                     ALSource->BuffersPlayed = ALSource->BuffersProcessed = ALSource->BuffersInQueue;
 658                                     BufferListItem = ALSource->queue;
 659                                     while(BufferListItem != NULL)
 660                                     {
 661                                         BufferListItem->bufferstate = PROCESSED;
 662                                         BufferListItem = BufferListItem->next;
 663                                     }
 664                                 }
 665                                 else
 666                                 {
 667                                     /* alSourceRewind */
 668                                     /* alSourcePlay */
 669                                     ALSource->state = AL_PLAYING;
 670                                     ALSource->inuse = AL_TRUE;
 671                                     ALSource->play = AL_TRUE;
 672                                     ALSource->BuffersPlayed = 0;
 673                                     ALSource->BufferPosition = 0;
 674                                     ALSource->lBytesPlayed = 0;
 675                                     ALSource->BuffersProcessed = 0;
 676                                     BufferListItem = ALSource->queue;
 677                                     while(BufferListItem != NULL)
 678                                     {
 679                                         BufferListItem->bufferstate = PENDING;
 680                                         BufferListItem = BufferListItem->next;
 681                                     }
 682                                     ALSource->ulBufferID = ALSource->queue->buffer;
 683
 684                                     ALSource->position = DataPosInt-DataSize;
 685                                     ALSource->position_fraction = DataPosFrac;
 686                                 }
 687                             }
 688                         }
 689                     }
 690
 691                     //Get source state
 692                     State = ALSource->state;
 693                 }
 694
 695                 ALSource = ALSource->next;
 696             }
 697
 698             //Post processing loop
 699             switch(format)
 700             {
 701                 case AL_FORMAT_MONO8:
 702                     for(i = 0;i < SamplesToDo;i++)
 703                     {
 704                         *((ALubyte*)buffer) = (ALubyte)((aluF2S(DryBuffer[i][0]+DryBuffer[i][1]+WetBuffer[i][0]+WetBuffer[i][1])>>8)+128);
 705                         buffer = ((ALubyte*)buffer) + 1;
 706                     }
 707                     break;
 708                 case AL_FORMAT_STEREO8:
 709                     for(i = 0;i < SamplesToDo*2;i++)
 710                     {
 711                         *((ALubyte*)buffer) = (ALubyte)((aluF2S(DryBuffer[i>>1][i&1]+WetBuffer[i>>1][i&1])>>8)+128);
 712                         buffer = ((ALubyte*)buffer) + 1;
 713                     }
 714                     break;
 715                 case AL_FORMAT_QUAD8:
 716                     for(i = 0;i < SamplesToDo*4;i++)
 717                     {
 718                         *((ALubyte*)buffer) = (ALubyte)((aluF2S(DryBuffer[i>>2][i&3]+WetBuffer[i>>2][i&3])>>8)+128);
 719                         buffer = ((ALubyte*)buffer) + 1;
 720                     }
 721                     break;
 722                 case AL_FORMAT_MONO16:
 723                     for(i = 0;i < SamplesToDo;i++)
 724                     {
 725                         *((ALshort*)buffer) = aluF2S(DryBuffer[i][0]+DryBuffer[i][1]+WetBuffer[i][0]+WetBuffer[i][1]);
 726                         buffer = ((ALshort*)buffer) + 1;
 727                     }
 728                     break;
 729                 case AL_FORMAT_STEREO16:
 730                 default:
 731                     for(i = 0;i < SamplesToDo*2;i++)
 732                     {
 733                         *((ALshort*)buffer) = aluF2S(DryBuffer[i>>1][i&1]+WetBuffer[i>>1][i&1]);
 734                         buffer = ((ALshort*)buffer) + 1;
 735                     }
 736                     break;
 737                 case AL_FORMAT_QUAD16:
 738                     for(i = 0;i < SamplesToDo*4;i++)
 739                     {
 740                         *((ALshort*)buffer) = aluF2S(DryBuffer[i>>2][i&3]+WetBuffer[i>>2][i&3]);
 741                         buffer = ((ALshort*)buffer) + 1;
 742                     }
 743                     break;
 744             }
 745
 746             size -= SamplesToDo;
 747         }
 748     }
 749
 750     ProcessContext(ALContext);
 751 }