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;
 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, WetGainHF;
 197
 198     //Get context properties
 199     DopplerFactor   = ALContext->DopplerFactor;
 200     DistanceModel   = ALContext->DistanceModel;
 201     DopplerVelocity = ALContext->DopplerVelocity;
 202     flSpeedOfSound  = ALContext->flSpeedOfSound;
 203
 204     //Get listener properties
 205     ListenerGain = ALContext->Listener.Gain;
 206     MetersPerUnit = ALContext->Listener.MetersPerUnit;
 207     memcpy(ListenerPosition, ALContext->Listener.Position, sizeof(ALContext->Listener.Position));
 208     memcpy(ListenerVelocity, ALContext->Listener.Velocity, sizeof(ALContext->Listener.Velocity));
 209     memcpy(&ListenerOrientation[0], ALContext->Listener.Forward, sizeof(ALContext->Listener.Forward));
 210     memcpy(&ListenerOrientation[3], ALContext->Listener.Up, sizeof(ALContext->Listener.Up));
 211
 212     //Get source properties
 213     Pitch        = ALSource->flPitch;
 214     SourceVolume = ALSource->flGain;
 215     memcpy(Position,  ALSource->vPosition,    sizeof(ALSource->vPosition));
 216     memcpy(Velocity,  ALSource->vVelocity,    sizeof(ALSource->vVelocity));
 217     memcpy(Direction, ALSource->vOrientation, sizeof(ALSource->vOrientation));
 218     MinVolume    = ALSource->flMinGain;
 219     MaxVolume    = ALSource->flMaxGain;
 220     MinDist      = ALSource->flRefDistance;
 221     MaxDist      = ALSource->flMaxDistance;
 222     Rolloff      = ALSource->flRollOffFactor;
 223     OuterGain    = ALSource->flOuterGain;
 224     InnerAngle   = ALSource->flInnerAngle;
 225     OuterAngle   = ALSource->flOuterAngle;
 226     HeadRelative = ALSource->bHeadRelative;
 227
 228     //Set working variables
 229     DryMix = (ALfloat)(1.0f);
 230     WetMix = (ALfloat)(0.0f);
 231
 232     //Only apply 3D calculations for mono buffers
 233     if(isMono != AL_FALSE)
 234     {
 235         //1. Translate Listener to origin (convert to head relative)
 236         if(HeadRelative==AL_FALSE)
 237         {
 238             Position[0] -= ListenerPosition[0];
 239             Position[1] -= ListenerPosition[1];
 240             Position[2] -= ListenerPosition[2];
 241         }
 242
 243         //2. Calculate distance attenuation
 244         Distance = aluSqrt(aluDotproduct(Position, Position));
 245
 246         flAttenuation = 1.0f;
 247         switch (DistanceModel)
 248         {
 249             case AL_INVERSE_DISTANCE_CLAMPED:
 250                 Distance=__max(Distance,MinDist);
 251                 Distance=__min(Distance,MaxDist);
 252                 if (MaxDist < MinDist)
 253                     break;
 254                 //fall-through
 255             case AL_INVERSE_DISTANCE:
 256                 if (MinDist > 0.0f)
 257                 {
 258                     if ((MinDist + (Rolloff * (Distance - MinDist))) > 0.0f)
 259                         flAttenuation = MinDist / (MinDist + (Rolloff * (Distance - MinDist)));
 260                 }
 261                 break;
 262
 263             case AL_LINEAR_DISTANCE_CLAMPED:
 264                 Distance=__max(Distance,MinDist);
 265                 Distance=__min(Distance,MaxDist);
 266                 if (MaxDist < MinDist)
 267                     break;
 268                 //fall-through
 269             case AL_LINEAR_DISTANCE:
 270                 Distance=__min(Distance,MaxDist);
 271                 if (MaxDist != MinDist)
 272                     flAttenuation = 1.0f - (Rolloff*(Distance-MinDist)/(MaxDist - MinDist));
 273                 break;
 274
 275             case AL_EXPONENT_DISTANCE_CLAMPED:
 276                 Distance=__max(Distance,MinDist);
 277                 Distance=__min(Distance,MaxDist);
 278                 if (MaxDist < MinDist)
 279                     break;
 280                 //fall-through
 281             case AL_EXPONENT_DISTANCE:
 282                 if ((Distance > 0.0f) && (MinDist > 0.0f))
 283                     flAttenuation = (ALfloat)pow(Distance/MinDist, -Rolloff);
 284                 break;
 285
 286             case AL_NONE:
 287             default:
 288                 flAttenuation = 1.0f;
 289                 break;
 290         }
 291
 292         // Source Gain + Attenuation
 293         DryMix = SourceVolume * flAttenuation;
 294
 295         // Clamp to Min/Max Gain
 296         DryMix = __min(DryMix,MaxVolume);
 297         DryMix = __max(DryMix,MinVolume);
 298         WetMix = __min(WetMix,MaxVolume);
 299         WetMix = __max(WetMix,MinVolume);
 300         //3. Apply directional soundcones
 301         DryGainHF = 1.0f;
 302         WetGainHF = 1.0f;
 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             ConeVolume = (1.0f+(OuterGain-1.0f)*(Angle-InnerAngle)/(OuterAngle-InnerAngle));
 311         else if(Angle > OuterAngle)
 312             ConeVolume = (1.0f+(OuterGain-1.0f)                                           );
 313         else
 314             ConeVolume = 1.0f;
 315
 316         //4. Calculate Velocity
 317         if(DopplerFactor != 0.0f)
 318         {
 319             flVLS = aluDotproduct(ListenerVelocity, SourceToListener);
 320             flVSS = aluDotproduct(Velocity, SourceToListener);
 321
 322             flMaxVelocity = (DopplerVelocity * flSpeedOfSound) / DopplerFactor;
 323
 324             if (flVSS >= flMaxVelocity)
 325                 flVSS = (flMaxVelocity - 1.0f);
 326             else if (flVSS <= -flMaxVelocity)
 327                 flVSS = -flMaxVelocity + 1.0f;
 328
 329             if (flVLS >= flMaxVelocity)
 330                 flVLS = (flMaxVelocity - 1.0f);
 331             else if (flVLS <= -flMaxVelocity)
 332                 flVLS = -flMaxVelocity + 1.0f;
 333
 334             pitch[0] = Pitch * ((flSpeedOfSound * DopplerVelocity) - (DopplerFactor * flVLS)) /
 335                                ((flSpeedOfSound * DopplerVelocity) - (DopplerFactor * flVSS));
 336         }
 337         else
 338             pitch[0] = Pitch;
 339
 340         //5. Align coordinate system axes
 341         aluCrossproduct(&ListenerOrientation[0], &ListenerOrientation[3], U); // Right-vector
 342         aluNormalize(U);                                // Normalized Right-vector
 343         memcpy(V, &ListenerOrientation[3], sizeof(V));  // Up-vector
 344         aluNormalize(V);                                // Normalized Up-vector
 345         memcpy(N, &ListenerOrientation[0], sizeof(N));  // At-vector
 346         aluNormalize(N);                                // Normalized At-vector
 347         Matrix[0][0] = U[0]; Matrix[0][1] = V[0]; Matrix[0][2] = -N[0];
 348         Matrix[1][0] = U[1]; Matrix[1][1] = V[1]; Matrix[1][2] = -N[1];
 349         Matrix[2][0] = U[2]; Matrix[2][1] = V[2]; Matrix[2][2] = -N[2];
 350         aluMatrixVector(Position, Matrix);
 351
 352         //6. Convert normalized position into left/right front/back pannings
 353         if(Distance != 0.0f)
 354         {
 355             aluNormalize(Position);
 356             PanningLR = 0.5f + 0.5f*Position[0];
 357             PanningFB = 0.5f + 0.5f*Position[2];
 358         }
 359         else
 360         {
 361             PanningLR = 0.5f;
 362             PanningFB = 0.5f;
 363         }
 364
 365         *drygainhf = DryGainHF;
 366         *wetgainhf = WetGainHF;
 367
 368         //7. Convert pannings into channel volumes
 369         switch(OutputFormat)
 370         {
 371             case AL_FORMAT_MONO8:
 372             case AL_FORMAT_MONO16:
 373                 drysend[0] = ConeVolume * ListenerGain * DryMix * aluSqrt(1.0f); //Direct
 374                 drysend[1] = ConeVolume * ListenerGain * DryMix * aluSqrt(1.0f); //Direct
 375                 wetsend[0] =              ListenerGain * WetMix * aluSqrt(1.0f); //Room
 376                 wetsend[1] =              ListenerGain * WetMix * aluSqrt(1.0f); //Room
 377                 break;
 378             case AL_FORMAT_STEREO8:
 379             case AL_FORMAT_STEREO16:
 380                 drysend[0] = ConeVolume * ListenerGain * DryMix * aluSqrt(1.0f-PanningLR); //L Direct
 381                 drysend[1] = ConeVolume * ListenerGain * DryMix * aluSqrt(     PanningLR); //R Direct
 382                 wetsend[0] =              ListenerGain * WetMix * aluSqrt(1.0f-PanningLR); //L Room
 383                 wetsend[1] =              ListenerGain * WetMix * aluSqrt(     PanningLR); //R Room
 384                 break;
 385             case AL_FORMAT_QUAD8:
 386             case AL_FORMAT_QUAD16:
 387                 drysend[0] = ConeVolume * ListenerGain * DryMix * aluSqrt((1.0f-PanningLR)*(1.0f-PanningFB)); //FL Direct
 388                 drysend[1] = ConeVolume * ListenerGain * DryMix * aluSqrt((     PanningLR)*(1.0f-PanningFB)); //FR Direct
 389                 drysend[2] = ConeVolume * ListenerGain * DryMix * aluSqrt((1.0f-PanningLR)*(     PanningFB)); //BL Direct
 390                 drysend[3] = ConeVolume * ListenerGain * DryMix * aluSqrt((     PanningLR)*(     PanningFB)); //BR Direct
 391                 wetsend[0] =              ListenerGain * WetMix * aluSqrt((1.0f-PanningLR)*(1.0f-PanningFB)); //FL Room
 392                 wetsend[1] =              ListenerGain * WetMix * aluSqrt((     PanningLR)*(1.0f-PanningFB)); //FR Room
 393                 wetsend[2] =              ListenerGain * WetMix * aluSqrt((1.0f-PanningLR)*(     PanningFB)); //BL Room
 394                 wetsend[3] =              ListenerGain * WetMix * aluSqrt((     PanningLR)*(     PanningFB)); //BR Room
 395                 break;
 396             default:
 397                 break;
 398         }
 399     }
 400     else
 401     {
 402         //1. Multi-channel buffers always play "normal"
 403         drysend[0] = SourceVolume * 1.0f * ListenerGain;
 404         drysend[1] = SourceVolume * 1.0f * ListenerGain;
 405         drysend[2] = SourceVolume * 1.0f * ListenerGain;
 406         drysend[3] = SourceVolume * 1.0f * ListenerGain;
 407         wetsend[0] = SourceVolume * 0.0f * ListenerGain;
 408         wetsend[1] = SourceVolume * 0.0f * ListenerGain;
 409         wetsend[2] = SourceVolume * 0.0f * ListenerGain;
 410         wetsend[3] = SourceVolume * 0.0f * ListenerGain;
 411
 412         pitch[0] = Pitch;
 413
 414         *drygainhf = 1.0;
 415         *wetgainhf = 1.0;
 416     }
 417 }
 418
 419 ALvoid aluMixData(ALCcontext *ALContext,ALvoid *buffer,ALsizei size,ALenum format)
 420 {
 421     static float DryBuffer[BUFFERSIZE][OUTPUTCHANNELS];
 422     static float WetBuffer[BUFFERSIZE][OUTPUTCHANNELS];
 423     ALfloat DrySend[OUTPUTCHANNELS] = { 0.0f, 0.0f, 0.0f, 0.0f };
 424     ALfloat WetSend[OUTPUTCHANNELS] = { 0.0f, 0.0f, 0.0f, 0.0f };
 425     ALfloat DryGainHF = 0.0f;
 426     ALfloat WetGainHF = 0.0f;
 427     ALuint BlockAlign,BufferSize;
 428     ALuint DataSize=0,DataPosInt=0,DataPosFrac=0;
 429     ALuint Channels,Bits,Frequency,ulExtraSamples;
 430     ALfloat Pitch;
 431     ALint Looping,increment,State;
 432     ALuint Buffer,fraction;
 433     ALuint SamplesToDo;
 434     ALsource *ALSource;
 435     ALbuffer *ALBuffer;
 436     ALfloat value;
 437     ALshort *Data;
 438     ALuint i,j,k;
 439     ALbufferlistitem *BufferListItem;
 440     ALuint loop;
 441     ALint64 DataSize64,DataPos64;
 442
 443     SuspendContext(ALContext);
 444
 445     if(buffer)
 446     {
 447         //Figure output format variables
 448         BlockAlign  = aluChannelsFromFormat(format);
 449         BlockAlign *= aluBytesFromFormat(format);
 450
 451         size /= BlockAlign;
 452         while(size > 0)
 453         {
 454             //Setup variables
 455             ALSource = (ALContext ? ALContext->Source : NULL);
 456             SamplesToDo = min(size, BUFFERSIZE);
 457
 458             //Clear mixing buffer
 459             memset(DryBuffer, 0, SamplesToDo*OUTPUTCHANNELS*sizeof(ALfloat));
 460             memset(WetBuffer, 0, SamplesToDo*OUTPUTCHANNELS*sizeof(ALfloat));
 461
 462             //Actual mixing loop
 463             while(ALSource)
 464             {
 465                 j = 0;
 466                 State = ALSource->state;
 467                 while(State == AL_PLAYING && j < SamplesToDo)
 468                 {
 469                     DataSize = 0;
 470                     DataPosInt = 0;
 471                     DataPosFrac = 0;
 472
 473                     //Get buffer info
 474                     if((Buffer = ALSource->ulBufferID))
 475                     {
 476                         ALBuffer = (ALbuffer*)ALTHUNK_LOOKUPENTRY(Buffer);
 477
 478                         Data      = ALBuffer->data;
 479                         Bits      = aluBytesFromFormat(ALBuffer->format) * 8;
 480                         Channels  = aluChannelsFromFormat(ALBuffer->format);
 481                         DataSize  = ALBuffer->size;
 482                         Frequency = ALBuffer->frequency;
 483
 484                         CalcSourceParams(ALContext, ALSource,
 485                                          (Channels==1) ? AL_TRUE : AL_FALSE,
 486                                          format, DrySend, WetSend, &Pitch,
 487                                          &DryGainHF, &WetGainHF);
 488
 489
 490                         Pitch = (Pitch*Frequency) / ALContext->Frequency;
 491                         DataSize = DataSize / (Bits*Channels/8);
 492
 493                         //Get source info
 494                         DataPosInt = ALSource->position;
 495                         DataPosFrac = ALSource->position_fraction;
 496
 497                         //Compute 18.14 fixed point step
 498                         increment = aluF2L(Pitch*(1L<<FRACTIONBITS));
 499                         if(increment > (MAX_PITCH<<FRACTIONBITS))
 500                             increment = (MAX_PITCH<<FRACTIONBITS);
 501
 502                         //Figure out how many samples we can mix.
 503                         //Pitch must be <= 4 (the number below !)
 504                         DataSize64 = DataSize+MAX_PITCH;
 505                         DataSize64 <<= FRACTIONBITS;
 506                         DataPos64 = DataPosInt;
 507                         DataPos64 <<= FRACTIONBITS;
 508                         DataPos64 += DataPosFrac;
 509                         BufferSize = (ALuint)((DataSize64-DataPos64) / increment);
 510                         BufferListItem = ALSource->queue;
 511                         for(loop = 0; loop < ALSource->BuffersPlayed; loop++)
 512                         {
 513                             if(BufferListItem)
 514                                 BufferListItem = BufferListItem->next;
 515                         }
 516                         if (BufferListItem)
 517                         {
 518                             if (BufferListItem->next)
 519                             {
 520                                 if(BufferListItem->next->buffer &&
 521                                    ((ALbuffer*)ALTHUNK_LOOKUPENTRY(BufferListItem->next->buffer))->data)
 522                                 {
 523                                     ulExtraSamples = min(((ALbuffer*)ALTHUNK_LOOKUPENTRY(BufferListItem->next->buffer))->size, (ALint)(16*Channels));
 524                                     memcpy(&Data[DataSize*Channels], ((ALbuffer*)ALTHUNK_LOOKUPENTRY(BufferListItem->next->buffer))->data, ulExtraSamples);
 525                                 }
 526                             }
 527                             else if (ALSource->bLooping)
 528                             {
 529                                 if (ALSource->queue->buffer)
 530                                 {
 531                                     if(((ALbuffer*)ALTHUNK_LOOKUPENTRY(ALSource->queue->buffer))->data)
 532                                     {
 533                                         ulExtraSamples = min(((ALbuffer*)ALTHUNK_LOOKUPENTRY(ALSource->queue->buffer))->size, (ALint)(16*Channels));
 534                                         memcpy(&Data[DataSize*Channels], ((ALbuffer*)ALTHUNK_LOOKUPENTRY(ALSource->queue->buffer))->data, ulExtraSamples);
 535                                     }
 536                                 }
 537                             }
 538                         }
 539                         BufferSize = min(BufferSize, (SamplesToDo-j));
 540
 541                         //Actual sample mixing loop
 542                         Data += DataPosInt*Channels;
 543                         while(BufferSize--)
 544                         {
 545                             k = DataPosFrac>>FRACTIONBITS;
 546                             fraction = DataPosFrac&FRACTIONMASK;
 547                             if(Channels==1)
 548                             {
 549                                 //First order interpolator
 550                                 ALfloat sample = (ALfloat)((ALshort)(((Data[k]*((1L<<FRACTIONBITS)-fraction))+(Data[k+1]*(fraction)))>>FRACTIONBITS));
 551
 552                                 //Direct path final mix buffer and panning
 553                                 value = aluComputeDrySample(ALSource, DryGainHF, sample);
 554                                 DryBuffer[j][0] += value*DrySend[0];
 555                                 DryBuffer[j][1] += value*DrySend[1];
 556                                 DryBuffer[j][2] += value*DrySend[2];
 557                                 DryBuffer[j][3] += value*DrySend[3];
 558
 559                                 //Room path final mix buffer and panning
 560                                 value = aluComputeWetSample(ALSource, WetGainHF, sample);
 561                                 WetBuffer[j][0] += value*WetSend[0];
 562                                 WetBuffer[j][1] += value*WetSend[1];
 563                                 WetBuffer[j][2] += value*WetSend[2];
 564                                 WetBuffer[j][3] += value*WetSend[3];
 565                             }
 566                             else
 567                             {
 568                                 //First order interpolator (left)
 569                                 value = (ALfloat)((ALshort)(((Data[k*2  ]*((1L<<FRACTIONBITS)-fraction))+(Data[k*2+2]*(fraction)))>>FRACTIONBITS));
 570                                 //Direct path final mix buffer and panning (left)
 571                                 DryBuffer[j][0] += value*DrySend[0];
 572                                 //Room path final mix buffer and panning (left)
 573                                 WetBuffer[j][0] += value*WetSend[0];
 574                                 //First order interpolator (right)
 575                                 value = (ALfloat)((ALshort)(((Data[k*2+1]*((1L<<FRACTIONBITS)-fraction))+(Data[k*2+3]*(fraction)))>>FRACTIONBITS));
 576                                 //Direct path final mix buffer and panning (right)
 577                                 DryBuffer[j][1] += value*DrySend[1];
 578                                 //Room path final mix buffer and panning (right)
 579                                 WetBuffer[j][1] += value*WetSend[1];
 580                             }
 581                             DataPosFrac += increment;
 582                             j++;
 583                         }
 584                         DataPosInt += (DataPosFrac>>FRACTIONBITS);
 585                         DataPosFrac = (DataPosFrac&FRACTIONMASK);
 586
 587                         //Update source info
 588                         ALSource->position = DataPosInt;
 589                         ALSource->position_fraction = DataPosFrac;
 590                     }
 591
 592                     //Handle looping sources
 593                     if(!Buffer || DataPosInt >= DataSize)
 594                     {
 595                         //queueing
 596                         if(ALSource->queue)
 597                         {
 598                             Looping = ALSource->bLooping;
 599                             if(ALSource->BuffersPlayed < (ALSource->BuffersInQueue-1))
 600                             {
 601                                 BufferListItem = ALSource->queue;
 602                                 for(loop = 0; loop <= ALSource->BuffersPlayed; loop++)
 603                                 {
 604                                     if(BufferListItem)
 605                                     {
 606                                         if(!Looping)
 607                                             BufferListItem->bufferstate = PROCESSED;
 608                                         BufferListItem = BufferListItem->next;
 609                                     }
 610                                 }
 611                                 if(!Looping)
 612                                     ALSource->BuffersProcessed++;
 613                                 if(BufferListItem)
 614                                     ALSource->ulBufferID = BufferListItem->buffer;
 615                                 ALSource->position = DataPosInt-DataSize;
 616                                 ALSource->position_fraction = DataPosFrac;
 617                                 ALSource->BuffersPlayed++;
 618                             }
 619                             else
 620                             {
 621                                 if(!Looping)
 622                                 {
 623                                     /* alSourceStop */
 624                                     ALSource->state = AL_STOPPED;
 625                                     ALSource->inuse = AL_FALSE;
 626                                     ALSource->BuffersPlayed = ALSource->BuffersProcessed = ALSource->BuffersInQueue;
 627                                     BufferListItem = ALSource->queue;
 628                                     while(BufferListItem != NULL)
 629                                     {
 630                                         BufferListItem->bufferstate = PROCESSED;
 631                                         BufferListItem = BufferListItem->next;
 632                                     }
 633                                 }
 634                                 else
 635                                 {
 636                                     /* alSourceRewind */
 637                                     /* alSourcePlay */
 638                                     ALSource->state = AL_PLAYING;
 639                                     ALSource->inuse = AL_TRUE;
 640                                     ALSource->play = AL_TRUE;
 641                                     ALSource->BuffersPlayed = 0;
 642                                     ALSource->BufferPosition = 0;
 643                                     ALSource->lBytesPlayed = 0;
 644                                     ALSource->BuffersProcessed = 0;
 645                                     BufferListItem = ALSource->queue;
 646                                     while(BufferListItem != NULL)
 647                                     {
 648                                         BufferListItem->bufferstate = PENDING;
 649                                         BufferListItem = BufferListItem->next;
 650                                     }
 651                                     ALSource->ulBufferID = ALSource->queue->buffer;
 652
 653                                     ALSource->position = DataPosInt-DataSize;
 654                                     ALSource->position_fraction = DataPosFrac;
 655                                 }
 656                             }
 657                         }
 658                     }
 659
 660                     //Get source state
 661                     State = ALSource->state;
 662                 }
 663
 664                 ALSource = ALSource->next;
 665             }
 666
 667             //Post processing loop
 668             switch(format)
 669             {
 670                 case AL_FORMAT_MONO8:
 671                     for(i = 0;i < SamplesToDo;i++)
 672                     {
 673                         *((ALubyte*)buffer) = (ALubyte)((aluF2S(DryBuffer[i][0]+DryBuffer[i][1]+WetBuffer[i][0]+WetBuffer[i][1])>>8)+128);
 674                         buffer = ((ALubyte*)buffer) + 1;
 675                     }
 676                     break;
 677                 case AL_FORMAT_STEREO8:
 678                     for(i = 0;i < SamplesToDo*2;i++)
 679                     {
 680                         *((ALubyte*)buffer) = (ALubyte)((aluF2S(DryBuffer[i>>1][i&1]+WetBuffer[i>>1][i&1])>>8)+128);
 681                         buffer = ((ALubyte*)buffer) + 1;
 682                     }
 683                     break;
 684                 case AL_FORMAT_QUAD8:
 685                     for(i = 0;i < SamplesToDo*4;i++)
 686                     {
 687                         *((ALubyte*)buffer) = (ALubyte)((aluF2S(DryBuffer[i>>2][i&3]+WetBuffer[i>>2][i&3])>>8)+128);
 688                         buffer = ((ALubyte*)buffer) + 1;
 689                     }
 690                     break;
 691                 case AL_FORMAT_MONO16:
 692                     for(i = 0;i < SamplesToDo;i++)
 693                     {
 694                         *((ALshort*)buffer) = aluF2S(DryBuffer[i][0]+DryBuffer[i][1]+WetBuffer[i][0]+WetBuffer[i][1]);
 695                         buffer = ((ALshort*)buffer) + 1;
 696                     }
 697                     break;
 698                 case AL_FORMAT_STEREO16:
 699                 default:
 700                     for(i = 0;i < SamplesToDo*2;i++)
 701                     {
 702                         *((ALshort*)buffer) = aluF2S(DryBuffer[i>>1][i&1]+WetBuffer[i>>1][i&1]);
 703                         buffer = ((ALshort*)buffer) + 1;
 704                     }
 705                     break;
 706                 case AL_FORMAT_QUAD16:
 707                     for(i = 0;i < SamplesToDo*4;i++)
 708                     {
 709                         *((ALshort*)buffer) = aluF2S(DryBuffer[i>>2][i&3]+WetBuffer[i>>2][i&3]);
 710                         buffer = ((ALshort*)buffer) + 1;
 711                     }
 712                     break;
 713             }
 714
 715             size -= SamplesToDo;
 716         }
 717     }
 718
 719     ProcessContext(ALContext);
 720 }