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 ALvoid CalcSourceParams(ALCcontext *ALContext, ALsource *ALSource,
 154                                ALenum isMono, ALenum OutputFormat,
 155                                ALfloat *drysend, ALfloat *wetsend,
 156                                ALfloat *pitch)
 157 {
 158     ALfloat ListenerOrientation[6],ListenerPosition[3],ListenerVelocity[3];
 159     ALfloat InnerAngle,OuterAngle,OuterGain,Angle,Distance,DryMix,WetMix;
 160     ALfloat Direction[3],Position[3],Velocity[3],SourceToListener[3];
 161     ALfloat MinVolume,MaxVolume,MinDist,MaxDist,Rolloff;
 162     ALfloat Pitch,ConeVolume,SourceVolume,PanningFB,PanningLR,ListenerGain;
 163     ALfloat U[3],V[3],N[3];
 164     ALfloat DopplerFactor, DopplerVelocity, flSpeedOfSound, flMaxVelocity;
 165     ALfloat flVSS, flVLS;
 166     ALint DistanceModel;
 167     ALfloat Matrix[3][3];
 168     ALint HeadRelative;
 169     ALfloat flAttenuation;
 170
 171     //Get context properties
 172     DopplerFactor   = ALContext->DopplerFactor;
 173     DistanceModel   = ALContext->DistanceModel;
 174     DopplerVelocity = ALContext->DopplerVelocity;
 175     flSpeedOfSound  = ALContext->flSpeedOfSound;
 176
 177     //Get listener properties
 178     ListenerGain = ALContext->Listener.Gain;
 179     memcpy(ListenerPosition, ALContext->Listener.Position, sizeof(ALContext->Listener.Position));
 180     memcpy(ListenerVelocity, ALContext->Listener.Velocity, sizeof(ALContext->Listener.Velocity));
 181     memcpy(&ListenerOrientation[0], ALContext->Listener.Forward, sizeof(ALContext->Listener.Forward));
 182     memcpy(&ListenerOrientation[3], ALContext->Listener.Up, sizeof(ALContext->Listener.Up));
 183
 184     //Get source properties
 185     Pitch        = ALSource->flPitch;
 186     SourceVolume = ALSource->flGain;
 187     memcpy(Position,  ALSource->vPosition,    sizeof(ALSource->vPosition));
 188     memcpy(Velocity,  ALSource->vVelocity,    sizeof(ALSource->vVelocity));
 189     memcpy(Direction, ALSource->vOrientation, sizeof(ALSource->vOrientation));
 190     MinVolume    = ALSource->flMinGain;
 191     MaxVolume    = ALSource->flMaxGain;
 192     MinDist      = ALSource->flRefDistance;
 193     MaxDist      = ALSource->flMaxDistance;
 194     Rolloff      = ALSource->flRollOffFactor;
 195     OuterGain    = ALSource->flOuterGain;
 196     InnerAngle   = ALSource->flInnerAngle;
 197     OuterAngle   = ALSource->flOuterAngle;
 198     HeadRelative = ALSource->bHeadRelative;
 199
 200     //Set working variables
 201     DryMix = (ALfloat)(1.0f);
 202     WetMix = (ALfloat)(0.0f);
 203
 204     //Only apply 3D calculations for mono buffers
 205     if(isMono != AL_FALSE)
 206     {
 207         //1. Translate Listener to origin (convert to head relative)
 208         if(HeadRelative==AL_FALSE)
 209         {
 210             Position[0] -= ListenerPosition[0];
 211             Position[1] -= ListenerPosition[1];
 212             Position[2] -= ListenerPosition[2];
 213         }
 214
 215         //2. Calculate distance attenuation
 216         Distance = aluSqrt(aluDotproduct(Position, Position));
 217
 218         flAttenuation = 1.0f;
 219         switch (DistanceModel)
 220         {
 221             case AL_INVERSE_DISTANCE_CLAMPED:
 222                 Distance=__max(Distance,MinDist);
 223                 Distance=__min(Distance,MaxDist);
 224                 if (MaxDist < MinDist)
 225                     break;
 226                 //fall-through
 227             case AL_INVERSE_DISTANCE:
 228                 if (MinDist > 0.0f)
 229                 {
 230                     if ((MinDist + (Rolloff * (Distance - MinDist))) > 0.0f)
 231                         flAttenuation = MinDist / (MinDist + (Rolloff * (Distance - MinDist)));
 232                 }
 233                 break;
 234
 235             case AL_LINEAR_DISTANCE_CLAMPED:
 236                 Distance=__max(Distance,MinDist);
 237                 Distance=__min(Distance,MaxDist);
 238                 if (MaxDist < MinDist)
 239                     break;
 240                 //fall-through
 241             case AL_LINEAR_DISTANCE:
 242                 Distance=__min(Distance,MaxDist);
 243                 if (MaxDist != MinDist)
 244                     flAttenuation = 1.0f - (Rolloff*(Distance-MinDist)/(MaxDist - MinDist));
 245                 break;
 246
 247             case AL_EXPONENT_DISTANCE_CLAMPED:
 248                 Distance=__max(Distance,MinDist);
 249                 Distance=__min(Distance,MaxDist);
 250                 if (MaxDist < MinDist)
 251                     break;
 252                 //fall-through
 253             case AL_EXPONENT_DISTANCE:
 254                 if ((Distance > 0.0f) && (MinDist > 0.0f))
 255                     flAttenuation = (ALfloat)pow(Distance/MinDist, -Rolloff);
 256                 break;
 257
 258             case AL_NONE:
 259             default:
 260                 flAttenuation = 1.0f;
 261                 break;
 262         }
 263
 264         // Source Gain + Attenuation
 265         DryMix = SourceVolume * flAttenuation;
 266
 267         // Clamp to Min/Max Gain
 268         DryMix = __min(DryMix,MaxVolume);
 269         DryMix = __max(DryMix,MinVolume);
 270         WetMix = __min(WetMix,MaxVolume);
 271         WetMix = __max(WetMix,MinVolume);
 272         //3. Apply directional soundcones
 273         SourceToListener[0] = -Position[0];
 274         SourceToListener[1] = -Position[1];
 275         SourceToListener[2] = -Position[2];
 276         aluNormalize(Direction);
 277         aluNormalize(SourceToListener);
 278         Angle = (ALfloat)(180.0*acos(aluDotproduct(Direction,SourceToListener))/3.141592654f);
 279         if(Angle >= InnerAngle && Angle <= OuterAngle)
 280             ConeVolume = (1.0f+(OuterGain-1.0f)*(Angle-InnerAngle)/(OuterAngle-InnerAngle));
 281         else if(Angle > OuterAngle)
 282             ConeVolume = (1.0f+(OuterGain-1.0f)                                           );
 283         else
 284             ConeVolume = 1.0f;
 285
 286         //4. Calculate Velocity
 287         if(DopplerFactor != 0.0f)
 288         {
 289             flVLS = aluDotproduct(ListenerVelocity, SourceToListener);
 290             flVSS = aluDotproduct(Velocity, SourceToListener);
 291
 292             flMaxVelocity = (DopplerVelocity * flSpeedOfSound) / DopplerFactor;
 293
 294             if (flVSS >= flMaxVelocity)
 295                 flVSS = (flMaxVelocity - 1.0f);
 296             else if (flVSS <= -flMaxVelocity)
 297                 flVSS = -flMaxVelocity + 1.0f;
 298
 299             if (flVLS >= flMaxVelocity)
 300                 flVLS = (flMaxVelocity - 1.0f);
 301             else if (flVLS <= -flMaxVelocity)
 302                 flVLS = -flMaxVelocity + 1.0f;
 303
 304             pitch[0] = Pitch * ((flSpeedOfSound * DopplerVelocity) - (DopplerFactor * flVLS)) /
 305                                ((flSpeedOfSound * DopplerVelocity) - (DopplerFactor * flVSS));
 306         }
 307         else
 308             pitch[0] = Pitch;
 309
 310         //5. Align coordinate system axes
 311         aluCrossproduct(&ListenerOrientation[0], &ListenerOrientation[3], U); // Right-vector
 312         aluNormalize(U);                                // Normalized Right-vector
 313         memcpy(V, &ListenerOrientation[3], sizeof(V));  // Up-vector
 314         aluNormalize(V);                                // Normalized Up-vector
 315         memcpy(N, &ListenerOrientation[0], sizeof(N));  // At-vector
 316         aluNormalize(N);                                // Normalized At-vector
 317         Matrix[0][0] = U[0]; Matrix[0][1] = V[0]; Matrix[0][2] = -N[0];
 318         Matrix[1][0] = U[1]; Matrix[1][1] = V[1]; Matrix[1][2] = -N[1];
 319         Matrix[2][0] = U[2]; Matrix[2][1] = V[2]; Matrix[2][2] = -N[2];
 320         aluMatrixVector(Position, Matrix);
 321
 322         //6. Convert normalized position into left/right front/back pannings
 323         if(Distance != 0.0f)
 324         {
 325             aluNormalize(Position);
 326             PanningLR = 0.5f + 0.5f*Position[0];
 327             PanningFB = 0.5f + 0.5f*Position[2];
 328         }
 329         else
 330         {
 331             PanningLR = 0.5f;
 332             PanningFB = 0.5f;
 333         }
 334
 335         //7. Convert pannings into channel volumes
 336         switch(OutputFormat)
 337         {
 338             case AL_FORMAT_MONO8:
 339             case AL_FORMAT_MONO16:
 340                 drysend[0] = ConeVolume * ListenerGain * DryMix * aluSqrt(1.0f); //Direct
 341                 drysend[1] = ConeVolume * ListenerGain * DryMix * aluSqrt(1.0f); //Direct
 342                 wetsend[0] =              ListenerGain * WetMix * aluSqrt(1.0f); //Room
 343                 wetsend[1] =              ListenerGain * WetMix * aluSqrt(1.0f); //Room
 344                 break;
 345             case AL_FORMAT_STEREO8:
 346             case AL_FORMAT_STEREO16:
 347                 drysend[0] = ConeVolume * ListenerGain * DryMix * aluSqrt(1.0f-PanningLR); //L Direct
 348                 drysend[1] = ConeVolume * ListenerGain * DryMix * aluSqrt(     PanningLR); //R Direct
 349                 wetsend[0] =              ListenerGain * WetMix * aluSqrt(1.0f-PanningLR); //L Room
 350                 wetsend[1] =              ListenerGain * WetMix * aluSqrt(     PanningLR); //R Room
 351                 break;
 352             case AL_FORMAT_QUAD8:
 353             case AL_FORMAT_QUAD16:
 354                 drysend[0] = ConeVolume * ListenerGain * DryMix * aluSqrt((1.0f-PanningLR)*(1.0f-PanningFB)); //FL Direct
 355                 drysend[1] = ConeVolume * ListenerGain * DryMix * aluSqrt((     PanningLR)*(1.0f-PanningFB)); //FR Direct
 356                 drysend[2] = ConeVolume * ListenerGain * DryMix * aluSqrt((1.0f-PanningLR)*(     PanningFB)); //BL Direct
 357                 drysend[3] = ConeVolume * ListenerGain * DryMix * aluSqrt((     PanningLR)*(     PanningFB)); //BR Direct
 358                 wetsend[0] =              ListenerGain * WetMix * aluSqrt((1.0f-PanningLR)*(1.0f-PanningFB)); //FL Room
 359                 wetsend[1] =              ListenerGain * WetMix * aluSqrt((     PanningLR)*(1.0f-PanningFB)); //FR Room
 360                 wetsend[2] =              ListenerGain * WetMix * aluSqrt((1.0f-PanningLR)*(     PanningFB)); //BL Room
 361                 wetsend[3] =              ListenerGain * WetMix * aluSqrt((     PanningLR)*(     PanningFB)); //BR Room
 362                 break;
 363             default:
 364                 break;
 365         }
 366     }
 367     else
 368     {
 369         //1. Multi-channel buffers always play "normal"
 370         drysend[0] = SourceVolume * 1.0f * ListenerGain;
 371         drysend[1] = SourceVolume * 1.0f * ListenerGain;
 372         drysend[2] = SourceVolume * 1.0f * ListenerGain;
 373         drysend[3] = SourceVolume * 1.0f * ListenerGain;
 374         wetsend[0] = SourceVolume * 0.0f * ListenerGain;
 375         wetsend[1] = SourceVolume * 0.0f * ListenerGain;
 376         wetsend[2] = SourceVolume * 0.0f * ListenerGain;
 377         wetsend[3] = SourceVolume * 0.0f * ListenerGain;
 378
 379         pitch[0] = Pitch;
 380     }
 381 }
 382
 383 ALvoid aluMixData(ALCcontext *ALContext,ALvoid *buffer,ALsizei size,ALenum format)
 384 {
 385     static float DryBuffer[BUFFERSIZE][OUTPUTCHANNELS];
 386     static float WetBuffer[BUFFERSIZE][OUTPUTCHANNELS];
 387     ALfloat DrySend[OUTPUTCHANNELS] = { 0.0f, 0.0f, 0.0f, 0.0f };
 388     ALfloat WetSend[OUTPUTCHANNELS] = { 0.0f, 0.0f, 0.0f, 0.0f };
 389     ALuint BlockAlign,BufferSize;
 390     ALuint DataSize=0,DataPosInt=0,DataPosFrac=0;
 391     ALuint Channels,Bits,Frequency,ulExtraSamples;
 392     ALfloat Pitch;
 393     ALint Looping,increment,State;
 394     ALuint Buffer,fraction;
 395     ALuint SamplesToDo;
 396     ALsource *ALSource;
 397     ALbuffer *ALBuffer;
 398     ALfloat value;
 399     ALshort *Data;
 400     ALuint i,j,k;
 401     ALbufferlistitem *BufferListItem;
 402     ALuint loop;
 403     ALint64 DataSize64,DataPos64;
 404
 405     SuspendContext(ALContext);
 406
 407     if(buffer)
 408     {
 409         //Figure output format variables
 410         BlockAlign = aluChannelsFromFormat(format) *
 411                      aluBytesFromFormat(format);
 412
 413         size /= BlockAlign;
 414         while(size > 0)
 415         {
 416             //Setup variables
 417             ALSource = (ALContext ? ALContext->Source : NULL);
 418             SamplesToDo = min(size, BUFFERSIZE);
 419
 420             //Clear mixing buffer
 421             memset(DryBuffer, 0, SamplesToDo*OUTPUTCHANNELS*sizeof(ALfloat));
 422             memset(WetBuffer, 0, SamplesToDo*OUTPUTCHANNELS*sizeof(ALfloat));
 423
 424             //Actual mixing loop
 425             while(ALSource)
 426             {
 427                 j = 0;
 428                 State = ALSource->state;
 429                 while(State == AL_PLAYING && j < SamplesToDo)
 430                 {
 431                     DataSize = 0;
 432                     DataPosInt = 0;
 433                     DataPosFrac = 0;
 434
 435                     //Get buffer info
 436                     if((Buffer = ALSource->ulBufferID))
 437                     {
 438                         ALBuffer = (ALbuffer*)ALTHUNK_LOOKUPENTRY(Buffer);
 439
 440                         Data      = ALBuffer->data;
 441                         Bits      = aluBytesFromFormat(ALBuffer->format) * 8;
 442                         Channels  = aluChannelsFromFormat(ALBuffer->format);
 443                         DataSize  = ALBuffer->size;
 444                         Frequency = ALBuffer->frequency;
 445
 446                         CalcSourceParams(ALContext, ALSource,
 447                                          (Channels==1) ? AL_TRUE : AL_FALSE,
 448                                          format, DrySend, WetSend, &Pitch);
 449
 450
 451                         Pitch = (Pitch*Frequency) / ALContext->Frequency;
 452                         DataSize = DataSize / (Bits*Channels/8);
 453
 454                         //Get source info
 455                         DataPosInt = ALSource->position;
 456                         DataPosFrac = ALSource->position_fraction;
 457
 458                         //Compute 18.14 fixed point step
 459                         increment = aluF2L(Pitch*(1L<<FRACTIONBITS));
 460                         if(increment > (MAX_PITCH<<FRACTIONBITS))
 461                             increment = (MAX_PITCH<<FRACTIONBITS);
 462
 463                         //Figure out how many samples we can mix.
 464                         //Pitch must be <= 4 (the number below !)
 465                         DataSize64 = DataSize+MAX_PITCH;
 466                         DataSize64 <<= FRACTIONBITS;
 467                         DataPos64 = DataPosInt;
 468                         DataPos64 <<= FRACTIONBITS;
 469                         DataPos64 += DataPosFrac;
 470                         BufferSize = (ALuint)((DataSize64-DataPos64) / increment);
 471                         BufferListItem = ALSource->queue;
 472                         for(loop = 0; loop < ALSource->BuffersPlayed; loop++)
 473                         {
 474                             if(BufferListItem)
 475                                 BufferListItem = BufferListItem->next;
 476                         }
 477                         if (BufferListItem)
 478                         {
 479                             if (BufferListItem->next)
 480                             {
 481                                 if(BufferListItem->next->buffer &&
 482                                    ((ALbuffer*)ALTHUNK_LOOKUPENTRY(BufferListItem->next->buffer))->data)
 483                                 {
 484                                     ulExtraSamples = min(((ALbuffer*)ALTHUNK_LOOKUPENTRY(BufferListItem->next->buffer))->size, (ALint)(16*Channels));
 485                                     memcpy(&Data[DataSize*Channels], ((ALbuffer*)ALTHUNK_LOOKUPENTRY(BufferListItem->next->buffer))->data, ulExtraSamples);
 486                                 }
 487                             }
 488                             else if (ALSource->bLooping)
 489                             {
 490                                 if (ALSource->queue->buffer)
 491                                 {
 492                                     if(((ALbuffer*)ALTHUNK_LOOKUPENTRY(ALSource->queue->buffer))->data)
 493                                     {
 494                                         ulExtraSamples = min(((ALbuffer*)ALTHUNK_LOOKUPENTRY(ALSource->queue->buffer))->size, (ALint)(16*Channels));
 495                                         memcpy(&Data[DataSize*Channels], ((ALbuffer*)ALTHUNK_LOOKUPENTRY(ALSource->queue->buffer))->data, ulExtraSamples);
 496                                     }
 497                                 }
 498                             }
 499                         }
 500                         BufferSize = min(BufferSize, (SamplesToDo-j));
 501
 502                         //Actual sample mixing loop
 503                         Data += DataPosInt*Channels;
 504                         while(BufferSize--)
 505                         {
 506                             k = DataPosFrac>>FRACTIONBITS;
 507                             fraction = DataPosFrac&FRACTIONMASK;
 508                             if(Channels==1)
 509                             {
 510                                 //First order interpolator
 511                                 value = (ALfloat)((ALshort)(((Data[k]*((1L<<FRACTIONBITS)-fraction))+(Data[k+1]*(fraction)))>>FRACTIONBITS));
 512                                 //Direct path final mix buffer and panning
 513                                 DryBuffer[j][0] += value*DrySend[0];
 514                                 DryBuffer[j][1] += value*DrySend[1];
 515                                 DryBuffer[j][2] += value*DrySend[2];
 516                                 DryBuffer[j][3] += value*DrySend[3];
 517                                 //Room path final mix buffer and panning
 518                                 WetBuffer[j][0] += value*WetSend[0];
 519                                 WetBuffer[j][1] += value*WetSend[1];
 520                                 WetBuffer[j][2] += value*WetSend[2];
 521                                 WetBuffer[j][3] += value*WetSend[3];
 522                             }
 523                             else
 524                             {
 525                                 //First order interpolator (left)
 526                                 value = (ALfloat)((ALshort)(((Data[k*2  ]*((1L<<FRACTIONBITS)-fraction))+(Data[k*2+2]*(fraction)))>>FRACTIONBITS));
 527                                 //Direct path final mix buffer and panning (left)
 528                                 DryBuffer[j][0] += value*DrySend[0];
 529                                 //Room path final mix buffer and panning (left)
 530                                 WetBuffer[j][0] += value*WetSend[0];
 531                                 //First order interpolator (right)
 532                                 value = (ALfloat)((ALshort)(((Data[k*2+1]*((1L<<FRACTIONBITS)-fraction))+(Data[k*2+3]*(fraction)))>>FRACTIONBITS));
 533                                 //Direct path final mix buffer and panning (right)
 534                                 DryBuffer[j][1] += value*DrySend[1];
 535                                 //Room path final mix buffer and panning (right)
 536                                 WetBuffer[j][1] += value*WetSend[1];
 537                             }
 538                             DataPosFrac += increment;
 539                             j++;
 540                         }
 541                         DataPosInt += (DataPosFrac>>FRACTIONBITS);
 542                         DataPosFrac = (DataPosFrac&FRACTIONMASK);
 543
 544                         //Update source info
 545                         ALSource->position = DataPosInt;
 546                         ALSource->position_fraction = DataPosFrac;
 547                     }
 548
 549                     //Handle looping sources
 550                     if(!Buffer || DataPosInt >= DataSize)
 551                     {
 552                         //queueing
 553                         if(ALSource->queue)
 554                         {
 555                             Looping = ALSource->bLooping;
 556                             if(ALSource->BuffersPlayed < (ALSource->BuffersInQueue-1))
 557                             {
 558                                 BufferListItem = ALSource->queue;
 559                                 for(loop = 0; loop <= ALSource->BuffersPlayed; loop++)
 560                                 {
 561                                     if(BufferListItem)
 562                                     {
 563                                         if(!Looping)
 564                                             BufferListItem->bufferstate = PROCESSED;
 565                                         BufferListItem = BufferListItem->next;
 566                                     }
 567                                 }
 568                                 if(!Looping)
 569                                     ALSource->BuffersProcessed++;
 570                                 if(BufferListItem)
 571                                     ALSource->ulBufferID = BufferListItem->buffer;
 572                                 ALSource->position = DataPosInt-DataSize;
 573                                 ALSource->position_fraction = DataPosFrac;
 574                                 ALSource->BuffersPlayed++;
 575                             }
 576                             else
 577                             {
 578                                 if(!Looping)
 579                                 {
 580                                     /* alSourceStop */
 581                                     ALSource->state = AL_STOPPED;
 582                                     ALSource->inuse = AL_FALSE;
 583                                     ALSource->BuffersPlayed = ALSource->BuffersProcessed = ALSource->BuffersInQueue;
 584                                     BufferListItem = ALSource->queue;
 585                                     while(BufferListItem != NULL)
 586                                     {
 587                                         BufferListItem->bufferstate = PROCESSED;
 588                                         BufferListItem = BufferListItem->next;
 589                                     }
 590                                 }
 591                                 else
 592                                 {
 593                                     /* alSourceRewind */
 594                                     /* alSourcePlay */
 595                                     ALSource->state = AL_PLAYING;
 596                                     ALSource->inuse = AL_TRUE;
 597                                     ALSource->play = AL_TRUE;
 598                                     ALSource->BuffersPlayed = 0;
 599                                     ALSource->BufferPosition = 0;
 600                                     ALSource->lBytesPlayed = 0;
 601                                     ALSource->BuffersProcessed = 0;
 602                                     BufferListItem = ALSource->queue;
 603                                     while(BufferListItem != NULL)
 604                                     {
 605                                         BufferListItem->bufferstate = PENDING;
 606                                         BufferListItem = BufferListItem->next;
 607                                     }
 608                                     ALSource->ulBufferID = ALSource->queue->buffer;
 609
 610                                     ALSource->position = DataPosInt-DataSize;
 611                                     ALSource->position_fraction = DataPosFrac;
 612                                 }
 613                             }
 614                         }
 615                     }
 616
 617                     //Get source state
 618                     State = ALSource->state;
 619                 }
 620
 621                 ALSource = ALSource->next;
 622             }
 623
 624             //Post processing loop
 625             switch(format)
 626             {
 627                 case AL_FORMAT_MONO8:
 628                     for(i = 0;i < SamplesToDo;i++)
 629                     {
 630                         *((ALubyte*)buffer) = (ALubyte)((aluF2S(DryBuffer[i][0]+DryBuffer[i][1]+WetBuffer[i][0]+WetBuffer[i][1])>>8)+128);
 631                         buffer = ((ALubyte*)buffer) + 1;
 632                     }
 633                     break;
 634                 case AL_FORMAT_STEREO8:
 635                     for(i = 0;i < SamplesToDo*2;i++)
 636                     {
 637                         *((ALubyte*)buffer) = (ALubyte)((aluF2S(DryBuffer[i>>1][i&1]+WetBuffer[i>>1][i&1])>>8)+128);
 638                         buffer = ((ALubyte*)buffer) + 1;
 639                     }
 640                     break;
 641                 case AL_FORMAT_QUAD8:
 642                     for(i = 0;i < SamplesToDo*4;i++)
 643                     {
 644                         *((ALubyte*)buffer) = (ALubyte)((aluF2S(DryBuffer[i>>2][i&3]+WetBuffer[i>>2][i&3])>>8)+128);
 645                         buffer = ((ALubyte*)buffer) + 1;
 646                     }
 647                     break;
 648                 case AL_FORMAT_MONO16:
 649                     for(i = 0;i < SamplesToDo;i++)
 650                     {
 651                         *((ALshort*)buffer) = aluF2S(DryBuffer[i][0]+DryBuffer[i][1]+WetBuffer[i][0]+WetBuffer[i][1]);
 652                         buffer = ((ALshort*)buffer) + 1;
 653                     }
 654                     break;
 655                 case AL_FORMAT_STEREO16:
 656                 default:
 657                     for(i = 0;i < SamplesToDo*2;i++)
 658                     {
 659                         *((ALshort*)buffer) = aluF2S(DryBuffer[i>>1][i&1]+WetBuffer[i>>1][i&1]);
 660                         buffer = ((ALshort*)buffer) + 1;
 661                     }
 662                     break;
 663                 case AL_FORMAT_QUAD16:
 664                     for(i = 0;i < SamplesToDo*4;i++)
 665                     {
 666                         *((ALshort*)buffer) = aluF2S(DryBuffer[i>>2][i&3]+WetBuffer[i>>2][i&3]);
 667                         buffer = ((ALshort*)buffer) + 1;
 668                     }
 669                     break;
 670             }
 671
 672             size -= SamplesToDo;
 673         }
 674     }
 675
 676     ProcessContext(ALContext);
 677 }