Alc/ALc.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 <stdlib.h>
  27 #include <stdio.h>
  28 #include <memory.h>
  29 #include <ctype.h>
  30 #include "alMain.h"
  31 #include "alSource.h"
  32 #include "AL/al.h"
  33 #include "AL/alc.h"
  34 #include "alThunk.h"
  35 #include "alSource.h"
  36 #include "alExtension.h"
  37 #include "alAuxEffectSlot.h"
  38 #include "bs2b.h"
  39
  40 ///////////////////////////////////////////////////////
  41 // DEBUG INFORMATION
  42
  43 char _alDebug[256];
  44
  45 ///////////////////////////////////////////////////////
  46
  47
  48 #define EmptyFuncs { NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL }
  49 struct {
  50     const char *name;
  51     void (*Init)(BackendFuncs*);
  52     BackendFuncs Funcs;
  53 } BackendList[] = {
  54 #ifdef HAVE_ALSA
  55     { "alsa", alc_alsa_init, EmptyFuncs },
  56 #endif
  57 #ifdef HAVE_OSS
  58     { "oss", alc_oss_init, EmptyFuncs },
  59 #endif
  60 #ifdef HAVE_DSOUND
  61     { "dsound", alcDSoundInit, EmptyFuncs },
  62 #endif
  63 #ifdef HAVE_WINMM
  64     { "winmm", alcWinMMInit, EmptyFuncs },
  65 #endif
  66
  67     { "wave", alc_wave_init, EmptyFuncs },
  68
  69     { NULL, NULL, EmptyFuncs }
  70 };
  71 #undef EmptyFuncs
  72
  73 ///////////////////////////////////////////////////////
  74
  75 #define ALC_EFX_MAJOR_VERSION                              0x20001
  76 #define ALC_EFX_MINOR_VERSION                              0x20002
  77 #define ALC_MAX_AUXILIARY_SENDS                            0x20003
  78
  79 ///////////////////////////////////////////////////////
  80 // STRING and EXTENSIONS
  81
  82 typedef struct ALCfunction_struct
  83 {
  84     ALCchar        *funcName;
  85     ALvoid        *address;
  86 } ALCfunction;
  87
  88 static ALCfunction  alcFunctions[] = {
  89     { "alcCreateContext",           (ALvoid *) alcCreateContext         },
  90     { "alcMakeContextCurrent",      (ALvoid *) alcMakeContextCurrent    },
  91     { "alcProcessContext",          (ALvoid *) alcProcessContext        },
  92     { "alcSuspendContext",          (ALvoid *) alcSuspendContext        },
  93     { "alcDestroyContext",          (ALvoid *) alcDestroyContext        },
  94     { "alcGetCurrentContext",       (ALvoid *) alcGetCurrentContext     },
  95     { "alcGetContextsDevice",       (ALvoid *) alcGetContextsDevice     },
  96     { "alcOpenDevice",              (ALvoid *) alcOpenDevice            },
  97     { "alcCloseDevice",             (ALvoid *) alcCloseDevice           },
  98     { "alcGetError",                (ALvoid *) alcGetError              },
  99     { "alcIsExtensionPresent",      (ALvoid *) alcIsExtensionPresent    },
 100     { "alcGetProcAddress",          (ALvoid *) alcGetProcAddress        },
 101     { "alcGetEnumValue",            (ALvoid *) alcGetEnumValue          },
 102     { "alcGetString",               (ALvoid *) alcGetString             },
 103     { "alcGetIntegerv",             (ALvoid *) alcGetIntegerv           },
 104     { "alcCaptureOpenDevice",       (ALvoid *) alcCaptureOpenDevice     },
 105     { "alcCaptureCloseDevice",      (ALvoid *) alcCaptureCloseDevice    },
 106     { "alcCaptureStart",            (ALvoid *) alcCaptureStart          },
 107     { "alcCaptureStop",             (ALvoid *) alcCaptureStop           },
 108     { "alcCaptureSamples",          (ALvoid *) alcCaptureSamples        },
 109     { NULL,                         (ALvoid *) NULL                     }
 110 };
 111
 112 static ALenums enumeration[]={
 113     // Types
 114     { (ALchar *)"ALC_INVALID",                          ALC_INVALID                         },
 115     { (ALchar *)"ALC_FALSE",                            ALC_FALSE                           },
 116     { (ALchar *)"ALC_TRUE",                             ALC_TRUE                            },
 117
 118     // ALC Properties
 119     { (ALchar *)"ALC_MAJOR_VERSION",                    ALC_MAJOR_VERSION                   },
 120     { (ALchar *)"ALC_MINOR_VERSION",                    ALC_MINOR_VERSION                   },
 121     { (ALchar *)"ALC_ATTRIBUTES_SIZE",                  ALC_ATTRIBUTES_SIZE                 },
 122     { (ALchar *)"ALC_ALL_ATTRIBUTES",                   ALC_ALL_ATTRIBUTES                  },
 123     { (ALchar *)"ALC_DEFAULT_DEVICE_SPECIFIER",         ALC_DEFAULT_DEVICE_SPECIFIER        },
 124     { (ALchar *)"ALC_DEVICE_SPECIFIER",                 ALC_DEVICE_SPECIFIER                },
 125     { (ALchar *)"ALC_ALL_DEVICES_SPECIFIER",            ALC_ALL_DEVICES_SPECIFIER           },
 126     { (ALchar *)"ALC_DEFAULT_ALL_DEVICES_SPECIFIER",    ALC_DEFAULT_ALL_DEVICES_SPECIFIER   },
 127     { (ALchar *)"ALC_EXTENSIONS",                       ALC_EXTENSIONS                      },
 128     { (ALchar *)"ALC_FREQUENCY",                        ALC_FREQUENCY                       },
 129     { (ALchar *)"ALC_REFRESH",                          ALC_REFRESH                         },
 130     { (ALchar *)"ALC_SYNC",                             ALC_SYNC                            },
 131     { (ALchar *)"ALC_MONO_SOURCES",                     ALC_MONO_SOURCES                    },
 132     { (ALchar *)"ALC_STEREO_SOURCES",                   ALC_STEREO_SOURCES                  },
 133     { (ALchar *)"ALC_CAPTURE_DEVICE_SPECIFIER",         ALC_CAPTURE_DEVICE_SPECIFIER        },
 134     { (ALchar *)"ALC_CAPTURE_DEFAULT_DEVICE_SPECIFIER", ALC_CAPTURE_DEFAULT_DEVICE_SPECIFIER},
 135     { (ALchar *)"ALC_CAPTURE_SAMPLES",                  ALC_CAPTURE_SAMPLES                 },
 136
 137     // EFX Properties
 138     { (ALchar *)"ALC_EFX_MAJOR_VERSION",                ALC_EFX_MAJOR_VERSION               },
 139     { (ALchar *)"ALC_EFX_MINOR_VERSION",                ALC_EFX_MINOR_VERSION               },
 140     { (ALchar *)"ALC_MAX_AUXILIARY_SENDS",              ALC_MAX_AUXILIARY_SENDS             },
 141
 142     // ALC Error Message
 143     { (ALchar *)"ALC_NO_ERROR",                         ALC_NO_ERROR                        },
 144     { (ALchar *)"ALC_INVALID_DEVICE",                   ALC_INVALID_DEVICE                  },
 145     { (ALchar *)"ALC_INVALID_CONTEXT",                  ALC_INVALID_CONTEXT                 },
 146     { (ALchar *)"ALC_INVALID_ENUM",                     ALC_INVALID_ENUM                    },
 147     { (ALchar *)"ALC_INVALID_VALUE",                    ALC_INVALID_VALUE                   },
 148     { (ALchar *)"ALC_OUT_OF_MEMORY",                    ALC_OUT_OF_MEMORY                   },
 149     { (ALchar *)NULL,                                   (ALenum)0 }
 150 };
 151 // Error strings
 152 static const ALCchar alcNoError[] = "No Error";
 153 static const ALCchar alcErrInvalidDevice[] = "Invalid Device";
 154 static const ALCchar alcErrInvalidContext[] = "Invalid Context";
 155 static const ALCchar alcErrInvalidEnum[] = "Invalid Enum";
 156 static const ALCchar alcErrInvalidValue[] = "Invalid Value";
 157 static const ALCchar alcErrOutOfMemory[] = "Out of Memory";
 158
 159 // Context strings
 160 static ALCchar alcDeviceList[2048];
 161 static ALCchar alcAllDeviceList[2048];
 162 static ALCchar alcCaptureDeviceList[2048];
 163 // Default is always the first in the list
 164 static ALCchar *alcDefaultDeviceSpecifier = alcDeviceList;
 165 static ALCchar *alcDefaultAllDeviceSpecifier = alcAllDeviceList;
 166 static ALCchar *alcCaptureDefaultDeviceSpecifier = alcCaptureDeviceList;
 167
 168
 169 static ALCchar alcExtensionList[] = "ALC_ENUMERATE_ALL_EXT ALC_ENUMERATION_EXT ALC_EXT_CAPTURE ALC_EXT_EFX";
 170 static ALCint alcMajorVersion = 1;
 171 static ALCint alcMinorVersion = 1;
 172
 173 static ALCint alcEFXMajorVersion = 1;
 174 static ALCint alcEFXMinorVersion = 0;
 175
 176 ///////////////////////////////////////////////////////
 177
 178
 179 ///////////////////////////////////////////////////////
 180 // Global Variables
 181
 182 static ALCdevice *g_pDeviceList = NULL;
 183 static ALCuint    g_ulDeviceCount = 0;
 184
 185 // Context List
 186 static ALCcontext *g_pContextList = NULL;
 187 static ALCuint     g_ulContextCount = 0;
 188
 189 // Context Error
 190 static ALCenum g_eLastContextError = ALC_NO_ERROR;
 191
 192 ///////////////////////////////////////////////////////
 193
 194
 195 ///////////////////////////////////////////////////////
 196 // ALC Related helper functions
 197
 198 static void InitAL(void)
 199 {
 200     static int done = 0;
 201     if(!done)
 202     {
 203         int i;
 204         const char *devs;
 205
 206         InitializeCriticalSection(&_alMutex);
 207         ALTHUNK_INIT();
 208         ReadALConfig();
 209
 210         devs = GetConfigValue(NULL, "drivers", "");
 211         if(devs[0])
 212         {
 213             int n;
 214             size_t len;
 215             const char *next = devs;
 216
 217             i = 0;
 218
 219             do {
 220                 devs = next;
 221                 next = strchr(devs, ',');
 222
 223                 if(!devs[0] || devs[0] == ',')
 224                     continue;
 225
 226                 len = (next ? ((size_t)(next-devs)) : strlen(devs));
 227                 for(n = i;BackendList[n].Init;n++)
 228                 {
 229                     if(len == strlen(BackendList[n].name) &&
 230                        strncmp(BackendList[n].name, devs, len) == 0)
 231                     {
 232                         const char *name = BackendList[i].name;
 233                         void (*Init)(BackendFuncs*) = BackendList[i].Init;
 234
 235                         BackendList[i].name = BackendList[n].name;
 236                         BackendList[i].Init = BackendList[n].Init;
 237
 238                         BackendList[n].name = name;
 239                         BackendList[n].Init = Init;
 240
 241                         i++;
 242                     }
 243                 }
 244             } while(next++);
 245
 246             BackendList[i].name = NULL;
 247             BackendList[i].Init = NULL;
 248         }
 249
 250         for(i = 0;BackendList[i].Init;i++)
 251             BackendList[i].Init(&BackendList[i].Funcs);
 252         done = 1;
 253     }
 254 }
 255
 256 ALCchar *AppendDeviceList(char *name)
 257 {
 258     static int pos;
 259     ALCchar *ret = alcDeviceList+pos;
 260     pos += snprintf(alcDeviceList+pos, sizeof(alcDeviceList)-pos, "%s", name) + 1;
 261     return ret;
 262 }
 263
 264 ALCchar *AppendAllDeviceList(char *name)
 265 {
 266     static int pos;
 267     ALCchar *ret = alcAllDeviceList+pos;
 268     pos += snprintf(alcAllDeviceList+pos, sizeof(alcAllDeviceList)-pos, "%s", name) + 1;
 269     return ret;
 270 }
 271
 272 ALCchar *AppendCaptureDeviceList(char *name)
 273 {
 274     static int pos;
 275     ALCchar *ret = alcCaptureDeviceList+pos;
 276     pos += snprintf(alcCaptureDeviceList+pos, sizeof(alcCaptureDeviceList)-pos, "%s", name) + 1;
 277     return ret;
 278 }
 279
 280 /*
 281     IsContext
 282
 283     Check pContext is a valid Context pointer
 284 */
 285 static ALCboolean IsContext(ALCcontext *pContext)
 286 {
 287     ALCcontext *pTempContext;
 288
 289     pTempContext = g_pContextList;
 290     while (pTempContext && pTempContext != pContext)
 291         pTempContext = pTempContext->next;
 292
 293     return (pTempContext ? ALC_TRUE : ALC_FALSE);
 294 }
 295
 296
 297 /*
 298     SetALCError
 299
 300     Store latest ALC Error
 301 */
 302 ALCvoid SetALCError(ALenum errorCode)
 303 {
 304     g_eLastContextError = errorCode;
 305 }
 306
 307
 308 /*
 309     SuspendContext
 310
 311     Thread-safe entry
 312 */
 313 ALCvoid SuspendContext(ALCcontext *pContext)
 314 {
 315     (void)pContext;
 316     EnterCriticalSection(&_alMutex);
 317 }
 318
 319
 320 /*
 321     ProcessContext
 322
 323     Thread-safe exit
 324 */
 325 ALCvoid ProcessContext(ALCcontext *pContext)
 326 {
 327     (void)pContext;
 328     LeaveCriticalSection(&_alMutex);
 329 }
 330
 331
 332 /*
 333     InitContext
 334
 335     Initialize Context variables
 336 */
 337 static ALvoid InitContext(ALCcontext *pContext)
 338 {
 339     int level;
 340
 341     //Initialise listener
 342     pContext->Listener.Gain = 1.0f;
 343     pContext->Listener.MetersPerUnit = 1.0f;
 344     pContext->Listener.Position[0] = 0.0f;
 345     pContext->Listener.Position[1] = 0.0f;
 346     pContext->Listener.Position[2] = 0.0f;
 347     pContext->Listener.Velocity[0] = 0.0f;
 348     pContext->Listener.Velocity[1] = 0.0f;
 349     pContext->Listener.Velocity[2] = 0.0f;
 350     pContext->Listener.Forward[0] = 0.0f;
 351     pContext->Listener.Forward[1] = 0.0f;
 352     pContext->Listener.Forward[2] = -1.0f;
 353     pContext->Listener.Up[0] = 0.0f;
 354     pContext->Listener.Up[1] = 1.0f;
 355     pContext->Listener.Up[2] = 0.0f;
 356
 357     //Validate pContext
 358     pContext->LastError = AL_NO_ERROR;
 359     pContext->InUse = AL_FALSE;
 360
 361     //Set output format
 362     pContext->Frequency = pContext->Device->Frequency;
 363
 364     //Set globals
 365     pContext->DistanceModel = AL_INVERSE_DISTANCE_CLAMPED;
 366     pContext->DopplerFactor = 1.0f;
 367     pContext->DopplerVelocity = 1.0f;
 368     pContext->flSpeedOfSound = SPEEDOFSOUNDMETRESPERSEC;
 369
 370     pContext->lNumStereoSources = 1;
 371     pContext->lNumMonoSources = pContext->Device->MaxNoOfSources - pContext->lNumStereoSources;
 372
 373     strcpy(pContext->ExtensionList, "AL_EXT_EXPONENT_DISTANCE AL_EXT_FLOAT32 AL_EXT_IMA4 AL_EXT_LINEAR_DISTANCE AL_EXT_MCFORMATS AL_EXT_OFFSET AL_LOKI_quadriphonic");
 374
 375     level = GetConfigValueInt(NULL, "cf_level", 0);
 376     if(level > 0 && level <= 6)
 377     {
 378         pContext->bs2b = calloc(1, sizeof(*pContext->bs2b));
 379         bs2b_set_srate(pContext->bs2b, pContext->Frequency);
 380         bs2b_set_level(pContext->bs2b, level);
 381     }
 382 }
 383
 384
 385 /*
 386     ExitContext
 387
 388     Clean up Context, destroy any remaining Sources
 389 */
 390 static ALCvoid ExitContext(ALCcontext *pContext)
 391 {
 392     //Invalidate context
 393     pContext->LastError = AL_NO_ERROR;
 394     pContext->InUse = AL_FALSE;
 395
 396     free(pContext->bs2b);
 397     pContext->bs2b = NULL;
 398 }
 399
 400 ///////////////////////////////////////////////////////
 401
 402
 403 ///////////////////////////////////////////////////////
 404 // ALC Functions calls
 405
 406
 407 // This should probably move to another c file but for now ...
 408 ALCAPI ALCdevice* ALCAPIENTRY alcCaptureOpenDevice(const ALCchar *deviceName, ALCuint frequency, ALCenum format, ALCsizei SampleSize)
 409 {
 410     ALCboolean DeviceFound = ALC_FALSE;
 411     ALCdevice *pDevice = NULL;
 412     ALCint i;
 413
 414     InitAL();
 415
 416     if(deviceName && !deviceName[0])
 417         deviceName = NULL;
 418
 419     pDevice = malloc(sizeof(ALCdevice));
 420     if (pDevice)
 421     {
 422         if (SampleSize > 0)
 423         {
 424             //Initialise device structure
 425             memset(pDevice, 0, sizeof(ALCdevice));
 426
 427             //Validate device
 428             pDevice->InUse = AL_TRUE;
 429             pDevice->IsCaptureDevice = AL_TRUE;
 430
 431             pDevice->Frequency = frequency;
 432             pDevice->Format = format;
 433             pDevice->Channels = aluChannelsFromFormat(format);
 434             pDevice->FrameSize = aluBytesFromFormat(format) *
 435                                  pDevice->Channels;
 436
 437             for(i = 0;BackendList[i].Init;i++)
 438             {
 439                 pDevice->Funcs = &BackendList[i].Funcs;
 440                 if(ALCdevice_OpenCapture(pDevice, deviceName, frequency, format, SampleSize))
 441                 {
 442                     SuspendContext(NULL);
 443                     pDevice->next = g_pDeviceList;
 444                     g_pDeviceList = pDevice;
 445                     g_ulDeviceCount++;
 446                     ProcessContext(NULL);
 447
 448                     DeviceFound = ALC_TRUE;
 449                     break;
 450                 }
 451             }
 452         }
 453         else
 454             SetALCError(ALC_INVALID_VALUE);
 455
 456         if(!DeviceFound)
 457         {
 458             free(pDevice);
 459             pDevice = NULL;
 460         }
 461     }
 462     else
 463         SetALCError(ALC_OUT_OF_MEMORY);
 464
 465     return pDevice;
 466 }
 467
 468 ALCAPI ALCboolean ALCAPIENTRY alcCaptureCloseDevice(ALCdevice *pDevice)
 469 {
 470     ALCboolean bReturn = ALC_FALSE;
 471     ALCdevice **list;
 472
 473     if ((pDevice)&&(pDevice->IsCaptureDevice))
 474     {
 475         SuspendContext(NULL);
 476
 477         list = &g_pDeviceList;
 478         while(*list != pDevice)
 479             list = &(*list)->next;
 480
 481         *list = (*list)->next;
 482         g_ulDeviceCount--;
 483
 484         ProcessContext(NULL);
 485
 486         ALCdevice_CloseCapture(pDevice);
 487         free(pDevice);
 488
 489         bReturn = ALC_TRUE;
 490     }
 491     else
 492         SetALCError(ALC_INVALID_DEVICE);
 493
 494     return bReturn;
 495 }
 496
 497 ALCAPI void ALCAPIENTRY alcCaptureStart(ALCdevice *pDevice)
 498 {
 499     if ((pDevice)&&(pDevice->IsCaptureDevice))
 500         ALCdevice_StartCapture(pDevice);
 501     else
 502         SetALCError(ALC_INVALID_DEVICE);
 503 }
 504
 505 ALCAPI void ALCAPIENTRY alcCaptureStop(ALCdevice *pDevice)
 506 {
 507     if ((pDevice)&&(pDevice->IsCaptureDevice))
 508         ALCdevice_StopCapture(pDevice);
 509     else
 510         SetALCError(ALC_INVALID_DEVICE);
 511 }
 512
 513 ALCAPI void ALCAPIENTRY alcCaptureSamples(ALCdevice *pDevice, ALCvoid *pBuffer, ALCsizei lSamples)
 514 {
 515     if ((pDevice) && (pDevice->IsCaptureDevice))
 516         ALCdevice_CaptureSamples(pDevice, pBuffer, lSamples);
 517     else
 518         SetALCError(ALC_INVALID_DEVICE);
 519 }
 520
 521 /*
 522     alcGetError
 523
 524     Return last ALC generated error code
 525 */
 526 ALCAPI ALCenum ALCAPIENTRY alcGetError(ALCdevice *device)
 527 {
 528     ALCenum errorCode;
 529
 530     (void)device;
 531
 532     errorCode = g_eLastContextError;
 533     g_eLastContextError = ALC_NO_ERROR;
 534     return errorCode;
 535 }
 536
 537
 538 /*
 539     alcSuspendContext
 540
 541     Not functional
 542 */
 543 ALCAPI ALCvoid ALCAPIENTRY alcSuspendContext(ALCcontext *pContext)
 544 {
 545     // Not a lot happens here !
 546     (void)pContext;
 547 }
 548
 549
 550 /*
 551     alcProcessContext
 552
 553     Not functional
 554 */
 555 ALCAPI ALCvoid ALCAPIENTRY alcProcessContext(ALCcontext *pContext)
 556 {
 557     // Not a lot happens here !
 558     (void)pContext;
 559 }
 560
 561
 562 /*
 563     alcGetString
 564
 565     Returns information about the Device, and error strings
 566 */
 567 ALCAPI const ALCchar* ALCAPIENTRY alcGetString(ALCdevice *pDevice,ALCenum param)
 568 {
 569     const ALCchar *value = NULL;
 570
 571     InitAL();
 572
 573     switch (param)
 574     {
 575     case ALC_NO_ERROR:
 576         value = alcNoError;
 577         break;
 578
 579     case ALC_INVALID_ENUM:
 580         value = alcErrInvalidEnum;
 581         break;
 582
 583     case ALC_INVALID_VALUE:
 584         value = alcErrInvalidValue;
 585         break;
 586
 587     case ALC_INVALID_DEVICE:
 588         value = alcErrInvalidDevice;
 589         break;
 590
 591     case ALC_INVALID_CONTEXT:
 592         value = alcErrInvalidContext;
 593         break;
 594
 595     case ALC_OUT_OF_MEMORY:
 596         value = alcErrOutOfMemory;
 597         break;
 598
 599     case ALC_DEFAULT_DEVICE_SPECIFIER:
 600         value = alcDefaultDeviceSpecifier;
 601         break;
 602
 603     case ALC_DEVICE_SPECIFIER:
 604         if (pDevice)
 605             value = pDevice->szDeviceName;
 606         else
 607             value = alcDeviceList;
 608         break;
 609
 610     case ALC_ALL_DEVICES_SPECIFIER:
 611         value = alcAllDeviceList;
 612         break;
 613
 614     case ALC_DEFAULT_ALL_DEVICES_SPECIFIER:
 615         value = alcDefaultAllDeviceSpecifier;
 616         break;
 617
 618     case ALC_CAPTURE_DEVICE_SPECIFIER:
 619         if (pDevice)
 620             value = pDevice->szDeviceName;
 621         else
 622             value = alcCaptureDeviceList;
 623         break;
 624
 625     case ALC_CAPTURE_DEFAULT_DEVICE_SPECIFIER:
 626         value = alcCaptureDefaultDeviceSpecifier;
 627         break;
 628
 629     case ALC_EXTENSIONS:
 630         value = alcExtensionList;
 631         break;
 632
 633     default:
 634         SetALCError(ALC_INVALID_ENUM);
 635         break;
 636     }
 637
 638     return value;
 639 }
 640
 641
 642 /*
 643     alcGetIntegerv
 644
 645     Returns information about the Device and the version of Open AL
 646 */
 647 ALCAPI ALCvoid ALCAPIENTRY alcGetIntegerv(ALCdevice *device,ALCenum param,ALsizei size,ALCint *data)
 648 {
 649     InitAL();
 650
 651     if ((device)&&(device->IsCaptureDevice))
 652     {
 653         SuspendContext(NULL);
 654
 655         // Capture device
 656         switch (param)
 657         {
 658         case ALC_CAPTURE_SAMPLES:
 659             if ((size) && (data))
 660                 *data = ALCdevice_AvailableSamples(device);
 661             else
 662                 SetALCError(ALC_INVALID_VALUE);
 663             break;
 664
 665         default:
 666             SetALCError(ALC_INVALID_ENUM);
 667             break;
 668         }
 669
 670         ProcessContext(NULL);
 671     }
 672     else
 673     {
 674         if(data)
 675         {
 676             // Playback Device
 677             switch (param)
 678             {
 679                 case ALC_MAJOR_VERSION:
 680                     if(!size)
 681                         SetALCError(ALC_INVALID_VALUE);
 682                     else
 683                         *data = alcMajorVersion;
 684                     break;
 685
 686                 case ALC_MINOR_VERSION:
 687                     if(!size)
 688                         SetALCError(ALC_INVALID_VALUE);
 689                     else
 690                         *data = alcMinorVersion;
 691                     break;
 692
 693                 case ALC_EFX_MAJOR_VERSION:
 694                     if(!size)
 695                         SetALCError(ALC_INVALID_VALUE);
 696                     else
 697                         *data = alcEFXMajorVersion;
 698                     break;
 699
 700                 case ALC_EFX_MINOR_VERSION:
 701                     if(!size)
 702                         SetALCError(ALC_INVALID_VALUE);
 703                     else
 704                         *data = alcEFXMinorVersion;
 705                     break;
 706
 707                 case ALC_MAX_AUXILIARY_SENDS:
 708                     if(!size)
 709                         SetALCError(ALC_INVALID_VALUE);
 710                     else
 711                         *data = MAX_SENDS;
 712                     break;
 713
 714                 case ALC_ATTRIBUTES_SIZE:
 715                     if(!device)
 716                         SetALCError(ALC_INVALID_DEVICE);
 717                     else if(!size)
 718                         SetALCError(ALC_INVALID_VALUE);
 719                     else
 720                         *data = 12;
 721                     break;
 722
 723                 case ALC_ALL_ATTRIBUTES:
 724                     if(!device)
 725                         SetALCError(ALC_INVALID_DEVICE);
 726                     else if (size < 7)
 727                         SetALCError(ALC_INVALID_VALUE);
 728                     else
 729                     {
 730                         int i = 0;
 731
 732                         data[i++] = ALC_FREQUENCY;
 733                         data[i++] = device->Frequency;
 734
 735                         data[i++] = ALC_REFRESH;
 736                         data[i++] = device->Frequency / device->UpdateFreq;
 737
 738                         data[i++] = ALC_SYNC;
 739                         data[i++] = ALC_FALSE;
 740
 741                         SuspendContext(NULL);
 742                         if(device->Context && size >= 12)
 743                         {
 744                             data[i++] = ALC_MONO_SOURCES;
 745                             data[i++] = device->Context->lNumMonoSources;
 746
 747                             data[i++] = ALC_STEREO_SOURCES;
 748                             data[i++] = device->Context->lNumStereoSources;
 749
 750                             data[i++] = ALC_MAX_AUXILIARY_SENDS;
 751                             data[i++] = MAX_SENDS;
 752                         }
 753                         ProcessContext(NULL);
 754
 755                         data[i++] = 0;
 756                     }
 757                     break;
 758
 759                 case ALC_FREQUENCY:
 760                     if(!device)
 761                         SetALCError(ALC_INVALID_DEVICE);
 762                     else if(!size)
 763                         SetALCError(ALC_INVALID_VALUE);
 764                     else
 765                         *data = device->Frequency;
 766                     break;
 767
 768                 case ALC_REFRESH:
 769                     if(!device)
 770                         SetALCError(ALC_INVALID_DEVICE);
 771                     else if(!size)
 772                         SetALCError(ALC_INVALID_VALUE);
 773                     else
 774                         *data = device->Frequency / device->UpdateFreq;
 775                     break;
 776
 777                 case ALC_SYNC:
 778                     if(!device)
 779                         SetALCError(ALC_INVALID_DEVICE);
 780                     else if(!size)
 781                         SetALCError(ALC_INVALID_VALUE);
 782                     else
 783                         *data = ALC_FALSE;
 784                     break;
 785
 786                 case ALC_MONO_SOURCES:
 787                     if(!device || !device->Context)
 788                         SetALCError(ALC_INVALID_DEVICE);
 789                     else if (size != 1)
 790                         SetALCError(ALC_INVALID_VALUE);
 791                     else
 792                         *data = device->Context->lNumMonoSources;
 793                     break;
 794
 795                 case ALC_STEREO_SOURCES:
 796                     if(!device || !device->Context)
 797                         SetALCError(ALC_INVALID_DEVICE);
 798                     else if (size != 1)
 799                         SetALCError(ALC_INVALID_VALUE);
 800                     else
 801                         *data = device->Context->lNumStereoSources;
 802                     break;
 803
 804                 default:
 805                     SetALCError(ALC_INVALID_ENUM);
 806                     break;
 807             }
 808         }
 809         else if(size)
 810             SetALCError(ALC_INVALID_VALUE);
 811     }
 812
 813     return;
 814 }
 815
 816
 817 /*
 818     alcIsExtensionPresent
 819
 820     Determines if there is support for a particular extension
 821 */
 822 ALCAPI ALCboolean ALCAPIENTRY alcIsExtensionPresent(ALCdevice *device, const ALCchar *extName)
 823 {
 824     ALCboolean bResult = ALC_FALSE;
 825
 826     (void)device;
 827
 828     if (extName)
 829     {
 830         const char *ptr;
 831         size_t len;
 832
 833         len = strlen(extName);
 834         ptr = alcExtensionList;
 835         while(ptr && *ptr)
 836         {
 837             if(strncasecmp(ptr, extName, len) == 0 &&
 838                (ptr[len] == '\0' || isspace(ptr[len])))
 839             {
 840                 bResult = ALC_TRUE;
 841                 break;
 842             }
 843             if((ptr=strchr(ptr, ' ')) != NULL)
 844             {
 845                 do {
 846                     ++ptr;
 847                 } while(isspace(*ptr));
 848             }
 849         }
 850     }
 851     else
 852         SetALCError(ALC_INVALID_VALUE);
 853
 854     return bResult;
 855 }
 856
 857
 858 /*
 859     alcGetProcAddress
 860
 861     Retrieves the function address for a particular extension function
 862 */
 863 ALCAPI ALCvoid *  ALCAPIENTRY alcGetProcAddress(ALCdevice *device, const ALCchar *funcName)
 864 {
 865     ALCvoid *pFunction = NULL;
 866     ALsizei i = 0;
 867
 868     (void)device;
 869
 870     if (funcName)
 871     {
 872         while(alcFunctions[i].funcName &&
 873               strcmp(alcFunctions[i].funcName,funcName) != 0)
 874             i++;
 875         pFunction = alcFunctions[i].address;
 876     }
 877     else
 878         SetALCError(ALC_INVALID_VALUE);
 879
 880     return pFunction;
 881 }
 882
 883
 884 /*
 885     alcGetEnumValue
 886
 887     Get the value for a particular ALC Enumerated Value
 888 */
 889 ALCAPI ALCenum ALCAPIENTRY alcGetEnumValue(ALCdevice *device, const ALCchar *enumName)
 890 {
 891     ALsizei i = 0;
 892     ALCenum val;
 893
 894     (void)device;
 895
 896     while ((enumeration[i].enumName)&&(strcmp(enumeration[i].enumName,enumName)))
 897         i++;
 898     val = enumeration[i].value;
 899
 900     if(!enumeration[i].enumName)
 901         SetALCError(ALC_INVALID_VALUE);
 902
 903     return val;
 904 }
 905
 906
 907 /*
 908     alcCreateContext
 909
 910     Create and attach a Context to a particular Device.
 911 */
 912 ALCAPI ALCcontext* ALCAPIENTRY alcCreateContext(ALCdevice *device, const ALCint *attrList)
 913 {
 914     ALCcontext *ALContext = NULL;
 915     ALuint      ulAttributeIndex, ulRequestedStereoSources;
 916
 917     if ((device)&&(!device->IsCaptureDevice))
 918     {
 919         // Reset Context Last Error code
 920         g_eLastContextError = ALC_NO_ERROR;
 921
 922         // Current implementation only allows one Context per Device
 923         if(!device->Context)
 924         {
 925             ALContext = calloc(1, sizeof(ALCcontext));
 926             if(!ALContext)
 927             {
 928                 SetALCError(ALC_OUT_OF_MEMORY);
 929                 return NULL;
 930             }
 931
 932             ALContext->Device = device;
 933             InitContext(ALContext);
 934
 935             device->Context = ALContext;
 936
 937             SuspendContext(NULL);
 938
 939             ALContext->next = g_pContextList;
 940             g_pContextList = ALContext;
 941             g_ulContextCount++;
 942
 943             ProcessContext(NULL);
 944
 945             // Check for Voice Count attributes
 946             if (attrList)
 947             {
 948                 ulAttributeIndex = 0;
 949                 while ((ulAttributeIndex < 10) && (attrList[ulAttributeIndex]))
 950                 {
 951                     if (attrList[ulAttributeIndex] == ALC_STEREO_SOURCES)
 952                     {
 953                         ulRequestedStereoSources = attrList[ulAttributeIndex + 1];
 954
 955                         if (ulRequestedStereoSources > ALContext->Device->MaxNoOfSources)
 956                             ulRequestedStereoSources = ALContext->Device->MaxNoOfSources;
 957
 958                         ALContext->lNumStereoSources = ulRequestedStereoSources;
 959                         ALContext->lNumMonoSources = ALContext->Device->MaxNoOfSources - ALContext->lNumStereoSources;
 960                         break;
 961                     }
 962
 963                     ulAttributeIndex += 2;
 964                 }
 965             }
 966         }
 967         else
 968         {
 969             SetALCError(ALC_INVALID_VALUE);
 970             ALContext = NULL;
 971         }
 972     }
 973     else
 974         SetALCError(ALC_INVALID_DEVICE);
 975
 976     return ALContext;
 977 }
 978
 979
 980 /*
 981     alcDestroyContext
 982
 983     Remove a Context
 984 */
 985 ALCAPI ALCvoid ALCAPIENTRY alcDestroyContext(ALCcontext *context)
 986 {
 987     ALCcontext **list;
 988
 989     // Lock context list
 990     SuspendContext(NULL);
 991
 992     if (IsContext(context))
 993     {
 994         // Lock context
 995         SuspendContext(context);
 996
 997         ReleaseALSources(context);
 998         ReleaseALAuxiliaryEffectSlots(context);
 999
1000         context->Device->Context = NULL;
1001
1002         list = &g_pContextList;
1003         while(*list != context)
1004             list = &(*list)->next;
1005
1006         *list = (*list)->next;
1007         g_ulContextCount--;
1008
1009         // Unlock context
1010         ProcessContext(context);
1011
1012         ExitContext(context);
1013
1014         // Free memory (MUST do this after ProcessContext)
1015         memset(context, 0, sizeof(ALCcontext));
1016         free(context);
1017     }
1018     else
1019         SetALCError(ALC_INVALID_CONTEXT);
1020
1021     ProcessContext(NULL);
1022 }
1023
1024
1025 /*
1026     alcGetCurrentContext
1027
1028     Returns the currently active Context
1029 */
1030 ALCAPI ALCcontext * ALCAPIENTRY alcGetCurrentContext(ALCvoid)
1031 {
1032     ALCcontext *pContext = NULL;
1033
1034     SuspendContext(NULL);
1035
1036     pContext = g_pContextList;
1037     while ((pContext) && (!pContext->InUse))
1038         pContext = pContext->next;
1039
1040     ProcessContext(NULL);
1041
1042     return pContext;
1043 }
1044
1045
1046 /*
1047     alcGetContextsDevice
1048
1049     Returns the Device that a particular Context is attached to
1050 */
1051 ALCAPI ALCdevice* ALCAPIENTRY alcGetContextsDevice(ALCcontext *pContext)
1052 {
1053     ALCdevice *pDevice = NULL;
1054
1055     SuspendContext(NULL);
1056     if (IsContext(pContext))
1057         pDevice = pContext->Device;
1058     else
1059         SetALCError(ALC_INVALID_CONTEXT);
1060     ProcessContext(NULL);
1061
1062     return pDevice;
1063 }
1064
1065
1066 /*
1067     alcMakeContextCurrent
1068
1069     Makes the given Context the active Context
1070 */
1071 ALCAPI ALCboolean ALCAPIENTRY alcMakeContextCurrent(ALCcontext *context)
1072 {
1073     ALCcontext *ALContext;
1074     ALboolean bReturn = AL_TRUE;
1075
1076     SuspendContext(NULL);
1077
1078     // context must be a valid Context or NULL
1079     if ((IsContext(context)) || (context == NULL))
1080     {
1081         if ((ALContext=alcGetCurrentContext()))
1082         {
1083             SuspendContext(ALContext);
1084             ALContext->InUse=AL_FALSE;
1085             ProcessContext(ALContext);
1086         }
1087
1088         if ((ALContext=context) && (ALContext->Device))
1089         {
1090             SuspendContext(ALContext);
1091             ALContext->InUse=AL_TRUE;
1092             ProcessContext(ALContext);
1093         }
1094     }
1095     else
1096     {
1097         SetALCError(ALC_INVALID_CONTEXT);
1098         bReturn = AL_FALSE;
1099     }
1100
1101     ProcessContext(NULL);
1102
1103     return bReturn;
1104 }
1105
1106
1107 /*
1108     alcOpenDevice
1109
1110     Open the Device specified.
1111 */
1112 ALCAPI ALCdevice* ALCAPIENTRY alcOpenDevice(const ALCchar *deviceName)
1113 {
1114     ALboolean bDeviceFound = AL_FALSE;
1115     ALCdevice *device;
1116     ALint i;
1117
1118     InitAL();
1119
1120     if(deviceName && !deviceName[0])
1121         deviceName = NULL;
1122
1123     device = malloc(sizeof(ALCdevice));
1124     if (device)
1125     {
1126         const char *fmt;
1127
1128         //Initialise device structure
1129         memset(device, 0, sizeof(ALCdevice));
1130
1131         //Validate device
1132         device->InUse = AL_TRUE;
1133         device->IsCaptureDevice = AL_FALSE;
1134
1135         //Set output format
1136         device->Frequency = GetConfigValueInt(NULL, "frequency", SWMIXER_OUTPUT_RATE);
1137         if((ALint)device->Frequency <= 0)
1138             device->Frequency = SWMIXER_OUTPUT_RATE;
1139
1140         fmt = GetConfigValue(NULL, "format", "AL_FORMAT_STEREO16");
1141         if(fmt[0])
1142             device->Format = alGetEnumValue(fmt);
1143
1144         device->Channels = aluChannelsFromFormat(device->Format);
1145         if(!device->Channels)
1146         {
1147             device->Format = AL_FORMAT_STEREO16;
1148             device->Channels = 2;
1149             device->FrameSize = 4;
1150         }
1151         else
1152             device->FrameSize = aluBytesFromFormat(device->Format) *
1153                                 device->Channels;
1154
1155         device->UpdateFreq = GetConfigValueInt(NULL, "refresh", 8192);
1156         if((ALint)device->UpdateFreq <= 0)
1157             device->UpdateFreq = 8192;
1158
1159         device->MaxNoOfSources = GetConfigValueInt(NULL, "sources", 256);
1160         if((ALint)device->MaxNoOfSources <= 0)
1161             device->MaxNoOfSources = 256;
1162
1163         // Find a playback device to open
1164         for(i = 0;BackendList[i].Init;i++)
1165         {
1166             device->Funcs = &BackendList[i].Funcs;
1167             if(ALCdevice_OpenPlayback(device, deviceName))
1168             {
1169                 SuspendContext(NULL);
1170                 device->next = g_pDeviceList;
1171                 g_pDeviceList = device;
1172                 g_ulDeviceCount++;
1173                 ProcessContext(NULL);
1174
1175                 bDeviceFound = AL_TRUE;
1176                 break;
1177             }
1178         }
1179
1180         if (!bDeviceFound)
1181         {
1182             // No suitable output device found
1183             free(device);
1184             device = NULL;
1185         }
1186     }
1187
1188     return device;
1189 }
1190
1191
1192 /*
1193     alcCloseDevice
1194
1195     Close the specified Device
1196 */
1197 ALCAPI ALCboolean ALCAPIENTRY alcCloseDevice(ALCdevice *pDevice)
1198 {
1199     ALCboolean bReturn = ALC_FALSE;
1200     ALCdevice **list;
1201
1202     if ((pDevice)&&(!pDevice->IsCaptureDevice))
1203     {
1204         SuspendContext(NULL);
1205
1206         list = &g_pDeviceList;
1207         while(*list != pDevice)
1208             list = &(*list)->next;
1209
1210         *list = (*list)->next;
1211         g_ulDeviceCount--;
1212
1213         ProcessContext(NULL);
1214
1215         if(pDevice->Context)
1216             alcDestroyContext(pDevice->Context);
1217         ALCdevice_ClosePlayback(pDevice);
1218
1219         //Release device structure
1220         memset(pDevice, 0, sizeof(ALCdevice));
1221         free(pDevice);
1222
1223         bReturn = ALC_TRUE;
1224     }
1225     else
1226         SetALCError(ALC_INVALID_DEVICE);
1227
1228     return bReturn;
1229 }
1230
1231
1232 ALCvoid ReleaseALC(ALCvoid)
1233 {
1234     ALCdevice *Dev;
1235
1236 #ifdef _DEBUG
1237     if(g_ulContextCount > 0)
1238         AL_PRINT("exit() %u device(s) and %u context(s) NOT deleted\n", g_ulDeviceCount, g_ulContextCount);
1239 #endif
1240
1241     while(g_pDeviceList)
1242     {
1243         Dev = g_pDeviceList;
1244         g_pDeviceList = g_pDeviceList->next;
1245         if(Dev->IsCaptureDevice)
1246             alcCaptureCloseDevice(Dev);
1247         else
1248             alcCloseDevice(Dev);
1249     }
1250 }
1251
1252 ///////////////////////////////////////////////////////