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 "alBuffer.h"
  37 #include "alExtension.h"
  38 #include "alAuxEffectSlot.h"
  39 #include "bs2b.h"
  40
  41 ///////////////////////////////////////////////////////
  42 // DEBUG INFORMATION
  43
  44 char _alDebug[256];
  45
  46 ///////////////////////////////////////////////////////
  47
  48
  49 #define EmptyFuncs { NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL }
  50 static struct {
  51     const char *name;
  52     void (*Init)(BackendFuncs*);
  53     BackendFuncs Funcs;
  54 } BackendList[] = {
  55 #ifdef HAVE_ALSA
  56     { "alsa", alc_alsa_init, EmptyFuncs },
  57 #endif
  58 #ifdef HAVE_OSS
  59     { "oss", alc_oss_init, EmptyFuncs },
  60 #endif
  61 #ifdef HAVE_SOLARIS
  62     { "solaris", alc_solaris_init, EmptyFuncs },
  63 #endif
  64 #ifdef HAVE_DSOUND
  65     { "dsound", alcDSoundInit, EmptyFuncs },
  66 #endif
  67 #ifdef HAVE_WINMM
  68     { "winmm", alcWinMMInit, EmptyFuncs },
  69 #endif
  70
  71     { "wave", alc_wave_init, EmptyFuncs },
  72
  73     { NULL, NULL, EmptyFuncs }
  74 };
  75 #undef EmptyFuncs
  76
  77 ///////////////////////////////////////////////////////
  78
  79 #define ALC_EFX_MAJOR_VERSION                              0x20001
  80 #define ALC_EFX_MINOR_VERSION                              0x20002
  81 #define ALC_MAX_AUXILIARY_SENDS                            0x20003
  82
  83 ///////////////////////////////////////////////////////
  84 // STRING and EXTENSIONS
  85
  86 typedef struct ALCfunction_struct
  87 {
  88     ALCchar        *funcName;
  89     ALvoid        *address;
  90 } ALCfunction;
  91
  92 static ALCfunction  alcFunctions[] = {
  93     { "alcCreateContext",           (ALvoid *) alcCreateContext         },
  94     { "alcMakeContextCurrent",      (ALvoid *) alcMakeContextCurrent    },
  95     { "alcProcessContext",          (ALvoid *) alcProcessContext        },
  96     { "alcSuspendContext",          (ALvoid *) alcSuspendContext        },
  97     { "alcDestroyContext",          (ALvoid *) alcDestroyContext        },
  98     { "alcGetCurrentContext",       (ALvoid *) alcGetCurrentContext     },
  99     { "alcGetContextsDevice",       (ALvoid *) alcGetContextsDevice     },
 100     { "alcOpenDevice",              (ALvoid *) alcOpenDevice            },
 101     { "alcCloseDevice",             (ALvoid *) alcCloseDevice           },
 102     { "alcGetError",                (ALvoid *) alcGetError              },
 103     { "alcIsExtensionPresent",      (ALvoid *) alcIsExtensionPresent    },
 104     { "alcGetProcAddress",          (ALvoid *) alcGetProcAddress        },
 105     { "alcGetEnumValue",            (ALvoid *) alcGetEnumValue          },
 106     { "alcGetString",               (ALvoid *) alcGetString             },
 107     { "alcGetIntegerv",             (ALvoid *) alcGetIntegerv           },
 108     { "alcCaptureOpenDevice",       (ALvoid *) alcCaptureOpenDevice     },
 109     { "alcCaptureCloseDevice",      (ALvoid *) alcCaptureCloseDevice    },
 110     { "alcCaptureStart",            (ALvoid *) alcCaptureStart          },
 111     { "alcCaptureStop",             (ALvoid *) alcCaptureStop           },
 112     { "alcCaptureSamples",          (ALvoid *) alcCaptureSamples        },
 113     { NULL,                         (ALvoid *) NULL                     }
 114 };
 115
 116 static ALenums enumeration[]={
 117     // Types
 118     { (ALchar *)"ALC_INVALID",                          ALC_INVALID                         },
 119     { (ALchar *)"ALC_FALSE",                            ALC_FALSE                           },
 120     { (ALchar *)"ALC_TRUE",                             ALC_TRUE                            },
 121
 122     // ALC Properties
 123     { (ALchar *)"ALC_MAJOR_VERSION",                    ALC_MAJOR_VERSION                   },
 124     { (ALchar *)"ALC_MINOR_VERSION",                    ALC_MINOR_VERSION                   },
 125     { (ALchar *)"ALC_ATTRIBUTES_SIZE",                  ALC_ATTRIBUTES_SIZE                 },
 126     { (ALchar *)"ALC_ALL_ATTRIBUTES",                   ALC_ALL_ATTRIBUTES                  },
 127     { (ALchar *)"ALC_DEFAULT_DEVICE_SPECIFIER",         ALC_DEFAULT_DEVICE_SPECIFIER        },
 128     { (ALchar *)"ALC_DEVICE_SPECIFIER",                 ALC_DEVICE_SPECIFIER                },
 129     { (ALchar *)"ALC_ALL_DEVICES_SPECIFIER",            ALC_ALL_DEVICES_SPECIFIER           },
 130     { (ALchar *)"ALC_DEFAULT_ALL_DEVICES_SPECIFIER",    ALC_DEFAULT_ALL_DEVICES_SPECIFIER   },
 131     { (ALchar *)"ALC_EXTENSIONS",                       ALC_EXTENSIONS                      },
 132     { (ALchar *)"ALC_FREQUENCY",                        ALC_FREQUENCY                       },
 133     { (ALchar *)"ALC_REFRESH",                          ALC_REFRESH                         },
 134     { (ALchar *)"ALC_SYNC",                             ALC_SYNC                            },
 135     { (ALchar *)"ALC_MONO_SOURCES",                     ALC_MONO_SOURCES                    },
 136     { (ALchar *)"ALC_STEREO_SOURCES",                   ALC_STEREO_SOURCES                  },
 137     { (ALchar *)"ALC_CAPTURE_DEVICE_SPECIFIER",         ALC_CAPTURE_DEVICE_SPECIFIER        },
 138     { (ALchar *)"ALC_CAPTURE_DEFAULT_DEVICE_SPECIFIER", ALC_CAPTURE_DEFAULT_DEVICE_SPECIFIER},
 139     { (ALchar *)"ALC_CAPTURE_SAMPLES",                  ALC_CAPTURE_SAMPLES                 },
 140
 141     // EFX Properties
 142     { (ALchar *)"ALC_EFX_MAJOR_VERSION",                ALC_EFX_MAJOR_VERSION               },
 143     { (ALchar *)"ALC_EFX_MINOR_VERSION",                ALC_EFX_MINOR_VERSION               },
 144     { (ALchar *)"ALC_MAX_AUXILIARY_SENDS",              ALC_MAX_AUXILIARY_SENDS             },
 145
 146     // ALC Error Message
 147     { (ALchar *)"ALC_NO_ERROR",                         ALC_NO_ERROR                        },
 148     { (ALchar *)"ALC_INVALID_DEVICE",                   ALC_INVALID_DEVICE                  },
 149     { (ALchar *)"ALC_INVALID_CONTEXT",                  ALC_INVALID_CONTEXT                 },
 150     { (ALchar *)"ALC_INVALID_ENUM",                     ALC_INVALID_ENUM                    },
 151     { (ALchar *)"ALC_INVALID_VALUE",                    ALC_INVALID_VALUE                   },
 152     { (ALchar *)"ALC_OUT_OF_MEMORY",                    ALC_OUT_OF_MEMORY                   },
 153     { (ALchar *)NULL,                                   (ALenum)0 }
 154 };
 155 // Error strings
 156 static const ALCchar alcNoError[] = "No Error";
 157 static const ALCchar alcErrInvalidDevice[] = "Invalid Device";
 158 static const ALCchar alcErrInvalidContext[] = "Invalid Context";
 159 static const ALCchar alcErrInvalidEnum[] = "Invalid Enum";
 160 static const ALCchar alcErrInvalidValue[] = "Invalid Value";
 161 static const ALCchar alcErrOutOfMemory[] = "Out of Memory";
 162
 163 // Context strings
 164 static ALCchar alcDeviceList[2048];
 165 static ALCchar alcAllDeviceList[2048];
 166 static ALCchar alcCaptureDeviceList[2048];
 167 // Default is always the first in the list
 168 static ALCchar *alcDefaultDeviceSpecifier = alcDeviceList;
 169 static ALCchar *alcDefaultAllDeviceSpecifier = alcAllDeviceList;
 170 static ALCchar *alcCaptureDefaultDeviceSpecifier = alcCaptureDeviceList;
 171
 172
 173 static ALCchar alcExtensionList[] = "ALC_ENUMERATE_ALL_EXT ALC_ENUMERATION_EXT ALC_EXT_CAPTURE ALC_EXT_EFX";
 174 static ALCint alcMajorVersion = 1;
 175 static ALCint alcMinorVersion = 1;
 176
 177 static ALCint alcEFXMajorVersion = 1;
 178 static ALCint alcEFXMinorVersion = 0;
 179
 180 ///////////////////////////////////////////////////////
 181
 182
 183 ///////////////////////////////////////////////////////
 184 // Global Variables
 185
 186 static ALCdevice *g_pDeviceList = NULL;
 187 static ALCuint    g_ulDeviceCount = 0;
 188
 189 static CRITICAL_SECTION g_csMutex;
 190
 191 // Context List
 192 static ALCcontext *g_pContextList = NULL;
 193 static ALCuint     g_ulContextCount = 0;
 194
 195 // Context Error
 196 static ALCenum g_eLastContextError = ALC_NO_ERROR;
 197
 198 static ALboolean init_done = AL_FALSE;
 199
 200 ///////////////////////////////////////////////////////
 201
 202
 203 ///////////////////////////////////////////////////////
 204 // ALC Related helper functions
 205 #ifdef _WIN32
 206 BOOL APIENTRY DllMain(HANDLE hModule,DWORD ul_reason_for_call,LPVOID lpReserved)
 207 {
 208     (void)lpReserved;
 209
 210     // Perform actions based on the reason for calling.
 211     switch(ul_reason_for_call)
 212     {
 213         case DLL_PROCESS_ATTACH:
 214             DisableThreadLibraryCalls(hModule);
 215             break;
 216
 217         case DLL_PROCESS_DETACH:
 218             if(!init_done)
 219                 break;
 220             ReleaseALC();
 221             ReleaseALBuffers();
 222             ReleaseALEffects();
 223             ReleaseALFilters();
 224             FreeALConfig();
 225             ALTHUNK_EXIT();
 226             DeleteCriticalSection(&g_csMutex);
 227             break;
 228     }
 229     return TRUE;
 230 }
 231 #else
 232 #ifdef HAVE_GCC_DESTRUCTOR
 233 static void my_deinit() __attribute__((destructor));
 234 static void my_deinit()
 235 {
 236     static ALenum once = AL_FALSE;
 237     if(once || !init_done) return;
 238     once = AL_TRUE;
 239
 240     ReleaseALC();
 241     ReleaseALBuffers();
 242     ReleaseALEffects();
 243     ReleaseALFilters();
 244     FreeALConfig();
 245     ALTHUNK_EXIT();
 246     DeleteCriticalSection(&g_csMutex);
 247 }
 248 #endif
 249 #endif
 250
 251 static void InitAL(void)
 252 {
 253     if(!init_done)
 254     {
 255         int i;
 256         const char *devs, *str;
 257
 258         init_done = AL_TRUE;
 259
 260         InitializeCriticalSection(&g_csMutex);
 261         ALTHUNK_INIT();
 262         ReadALConfig();
 263
 264         devs = GetConfigValue(NULL, "drivers", "");
 265         if(devs[0])
 266         {
 267             int n;
 268             size_t len;
 269             const char *next = devs;
 270
 271             i = 0;
 272
 273             do {
 274                 devs = next;
 275                 next = strchr(devs, ',');
 276
 277                 if(!devs[0] || devs[0] == ',')
 278                     continue;
 279
 280                 len = (next ? ((size_t)(next-devs)) : strlen(devs));
 281                 for(n = i;BackendList[n].Init;n++)
 282                 {
 283                     if(len == strlen(BackendList[n].name) &&
 284                        strncmp(BackendList[n].name, devs, len) == 0)
 285                     {
 286                         const char *name = BackendList[i].name;
 287                         void (*Init)(BackendFuncs*) = BackendList[i].Init;
 288
 289                         BackendList[i].name = BackendList[n].name;
 290                         BackendList[i].Init = BackendList[n].Init;
 291
 292                         BackendList[n].name = name;
 293                         BackendList[n].Init = Init;
 294
 295                         i++;
 296                     }
 297                 }
 298             } while(next++);
 299
 300             BackendList[i].name = NULL;
 301             BackendList[i].Init = NULL;
 302         }
 303
 304         for(i = 0;BackendList[i].Init;i++)
 305             BackendList[i].Init(&BackendList[i].Funcs);
 306
 307         str = GetConfigValue(NULL, "stereodup", "false");
 308         DuplicateStereo = (strcasecmp(str, "true") == 0 ||
 309                            strcasecmp(str, "yes") == 0 ||
 310                            strcasecmp(str, "on") == 0 ||
 311                            atoi(str) != 0);
 312     }
 313 }
 314
 315 ALCchar *AppendDeviceList(char *name)
 316 {
 317     static size_t pos;
 318     ALCchar *ret = alcDeviceList+pos;
 319     if(pos >= sizeof(alcDeviceList))
 320     {
 321         AL_PRINT("Not enough room to add %s!\n", name);
 322         return alcDeviceList + sizeof(alcDeviceList) - 1;
 323     }
 324     pos += snprintf(alcDeviceList+pos, sizeof(alcDeviceList)-pos-1, "%s", name) + 1;
 325     return ret;
 326 }
 327
 328 ALCchar *AppendAllDeviceList(char *name)
 329 {
 330     static size_t pos;
 331     ALCchar *ret = alcAllDeviceList+pos;
 332     if(pos >= sizeof(alcAllDeviceList))
 333     {
 334         AL_PRINT("Not enough room to add %s!\n", name);
 335         return alcAllDeviceList + sizeof(alcAllDeviceList) - 1;
 336     }
 337     pos += snprintf(alcAllDeviceList+pos, sizeof(alcAllDeviceList)-pos-1, "%s", name) + 1;
 338     return ret;
 339 }
 340
 341 ALCchar *AppendCaptureDeviceList(char *name)
 342 {
 343     static size_t pos;
 344     ALCchar *ret = alcCaptureDeviceList+pos;
 345     if(pos >= sizeof(alcCaptureDeviceList))
 346     {
 347         AL_PRINT("Not enough room to add %s!\n", name);
 348         return alcCaptureDeviceList + sizeof(alcCaptureDeviceList) - 1;
 349     }
 350     pos += snprintf(alcCaptureDeviceList+pos, sizeof(alcCaptureDeviceList)-pos-1, "%s", name) + 1;
 351     return ret;
 352 }
 353
 354 /*
 355     IsContext
 356
 357     Check pContext is a valid Context pointer
 358 */
 359 static ALCboolean IsContext(ALCcontext *pContext)
 360 {
 361     ALCcontext *pTempContext;
 362
 363     pTempContext = g_pContextList;
 364     while (pTempContext && pTempContext != pContext)
 365         pTempContext = pTempContext->next;
 366
 367     return (pTempContext ? ALC_TRUE : ALC_FALSE);
 368 }
 369
 370
 371 /*
 372     SetALCError
 373
 374     Store latest ALC Error
 375 */
 376 ALCvoid SetALCError(ALenum errorCode)
 377 {
 378     g_eLastContextError = errorCode;
 379 }
 380
 381
 382 /*
 383     SuspendContext
 384
 385     Thread-safe entry
 386 */
 387 ALCvoid SuspendContext(ALCcontext *pContext)
 388 {
 389     (void)pContext;
 390     EnterCriticalSection(&g_csMutex);
 391 }
 392
 393
 394 /*
 395     ProcessContext
 396
 397     Thread-safe exit
 398 */
 399 ALCvoid ProcessContext(ALCcontext *pContext)
 400 {
 401     (void)pContext;
 402     LeaveCriticalSection(&g_csMutex);
 403 }
 404
 405
 406 /*
 407     InitContext
 408
 409     Initialize Context variables
 410 */
 411 static ALvoid InitContext(ALCcontext *pContext)
 412 {
 413     int level;
 414
 415     //Initialise listener
 416     pContext->Listener.Gain = 1.0f;
 417     pContext->Listener.MetersPerUnit = 1.0f;
 418     pContext->Listener.Position[0] = 0.0f;
 419     pContext->Listener.Position[1] = 0.0f;
 420     pContext->Listener.Position[2] = 0.0f;
 421     pContext->Listener.Velocity[0] = 0.0f;
 422     pContext->Listener.Velocity[1] = 0.0f;
 423     pContext->Listener.Velocity[2] = 0.0f;
 424     pContext->Listener.Forward[0] = 0.0f;
 425     pContext->Listener.Forward[1] = 0.0f;
 426     pContext->Listener.Forward[2] = -1.0f;
 427     pContext->Listener.Up[0] = 0.0f;
 428     pContext->Listener.Up[1] = 1.0f;
 429     pContext->Listener.Up[2] = 0.0f;
 430
 431     //Validate pContext
 432     pContext->LastError = AL_NO_ERROR;
 433     pContext->InUse = AL_FALSE;
 434
 435     //Set output format
 436     pContext->Frequency = pContext->Device->Frequency;
 437
 438     //Set globals
 439     pContext->DistanceModel = AL_INVERSE_DISTANCE_CLAMPED;
 440     pContext->DopplerFactor = 1.0f;
 441     pContext->DopplerVelocity = 1.0f;
 442     pContext->flSpeedOfSound = SPEEDOFSOUNDMETRESPERSEC;
 443
 444     pContext->lNumStereoSources = 1;
 445     pContext->lNumMonoSources = pContext->Device->MaxNoOfSources - pContext->lNumStereoSources;
 446
 447     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";
 448
 449     level = GetConfigValueInt(NULL, "cf_level", 0);
 450     if(level > 0 && level <= 6)
 451     {
 452         pContext->bs2b = calloc(1, sizeof(*pContext->bs2b));
 453         bs2b_set_srate(pContext->bs2b, pContext->Frequency);
 454         bs2b_set_level(pContext->bs2b, level);
 455     }
 456 }
 457
 458
 459 /*
 460     ExitContext
 461
 462     Clean up Context, destroy any remaining Sources
 463 */
 464 static ALCvoid ExitContext(ALCcontext *pContext)
 465 {
 466     //Invalidate context
 467     pContext->LastError = AL_NO_ERROR;
 468     pContext->InUse = AL_FALSE;
 469
 470     free(pContext->bs2b);
 471     pContext->bs2b = NULL;
 472 }
 473
 474 ///////////////////////////////////////////////////////
 475
 476
 477 ///////////////////////////////////////////////////////
 478 // ALC Functions calls
 479
 480
 481 // This should probably move to another c file but for now ...
 482 ALCAPI ALCdevice* ALCAPIENTRY alcCaptureOpenDevice(const ALCchar *deviceName, ALCuint frequency, ALCenum format, ALCsizei SampleSize)
 483 {
 484     ALCboolean DeviceFound = ALC_FALSE;
 485     ALCdevice *pDevice = NULL;
 486     ALCint i;
 487
 488     InitAL();
 489
 490     if(deviceName && !deviceName[0])
 491         deviceName = NULL;
 492
 493     pDevice = malloc(sizeof(ALCdevice));
 494     if (pDevice)
 495     {
 496         if (SampleSize > 0)
 497         {
 498             //Initialise device structure
 499             memset(pDevice, 0, sizeof(ALCdevice));
 500
 501             //Validate device
 502             pDevice->IsCaptureDevice = AL_TRUE;
 503
 504             pDevice->Frequency = frequency;
 505             pDevice->Format = format;
 506
 507             for(i = 0;BackendList[i].Init;i++)
 508             {
 509                 pDevice->Funcs = &BackendList[i].Funcs;
 510                 if(ALCdevice_OpenCapture(pDevice, deviceName, frequency, format, SampleSize))
 511                 {
 512                     SuspendContext(NULL);
 513                     pDevice->next = g_pDeviceList;
 514                     g_pDeviceList = pDevice;
 515                     g_ulDeviceCount++;
 516                     ProcessContext(NULL);
 517
 518                     DeviceFound = ALC_TRUE;
 519                     break;
 520                 }
 521             }
 522         }
 523         else
 524             SetALCError(ALC_INVALID_VALUE);
 525
 526         if(!DeviceFound)
 527         {
 528             free(pDevice);
 529             pDevice = NULL;
 530         }
 531     }
 532     else
 533         SetALCError(ALC_OUT_OF_MEMORY);
 534
 535     return pDevice;
 536 }
 537
 538 ALCAPI ALCboolean ALCAPIENTRY alcCaptureCloseDevice(ALCdevice *pDevice)
 539 {
 540     ALCboolean bReturn = ALC_FALSE;
 541     ALCdevice **list;
 542
 543     if ((pDevice)&&(pDevice->IsCaptureDevice))
 544     {
 545         SuspendContext(NULL);
 546
 547         list = &g_pDeviceList;
 548         while(*list != pDevice)
 549             list = &(*list)->next;
 550
 551         *list = (*list)->next;
 552         g_ulDeviceCount--;
 553
 554         ProcessContext(NULL);
 555
 556         ALCdevice_CloseCapture(pDevice);
 557         free(pDevice);
 558
 559         bReturn = ALC_TRUE;
 560     }
 561     else
 562         SetALCError(ALC_INVALID_DEVICE);
 563
 564     return bReturn;
 565 }
 566
 567 ALCAPI void ALCAPIENTRY alcCaptureStart(ALCdevice *pDevice)
 568 {
 569     if ((pDevice)&&(pDevice->IsCaptureDevice))
 570         ALCdevice_StartCapture(pDevice);
 571     else
 572         SetALCError(ALC_INVALID_DEVICE);
 573 }
 574
 575 ALCAPI void ALCAPIENTRY alcCaptureStop(ALCdevice *pDevice)
 576 {
 577     if ((pDevice)&&(pDevice->IsCaptureDevice))
 578         ALCdevice_StopCapture(pDevice);
 579     else
 580         SetALCError(ALC_INVALID_DEVICE);
 581 }
 582
 583 ALCAPI void ALCAPIENTRY alcCaptureSamples(ALCdevice *pDevice, ALCvoid *pBuffer, ALCsizei lSamples)
 584 {
 585     if ((pDevice) && (pDevice->IsCaptureDevice))
 586         ALCdevice_CaptureSamples(pDevice, pBuffer, lSamples);
 587     else
 588         SetALCError(ALC_INVALID_DEVICE);
 589 }
 590
 591 /*
 592     alcGetError
 593
 594     Return last ALC generated error code
 595 */
 596 ALCAPI ALCenum ALCAPIENTRY alcGetError(ALCdevice *device)
 597 {
 598     ALCenum errorCode;
 599
 600     (void)device;
 601
 602     errorCode = g_eLastContextError;
 603     g_eLastContextError = ALC_NO_ERROR;
 604     return errorCode;
 605 }
 606
 607
 608 /*
 609     alcSuspendContext
 610
 611     Not functional
 612 */
 613 ALCAPI ALCvoid ALCAPIENTRY alcSuspendContext(ALCcontext *pContext)
 614 {
 615     // Not a lot happens here !
 616     (void)pContext;
 617 }
 618
 619
 620 /*
 621     alcProcessContext
 622
 623     Not functional
 624 */
 625 ALCAPI ALCvoid ALCAPIENTRY alcProcessContext(ALCcontext *pContext)
 626 {
 627     // Not a lot happens here !
 628     (void)pContext;
 629 }
 630
 631
 632 /*
 633     alcGetString
 634
 635     Returns information about the Device, and error strings
 636 */
 637 ALCAPI const ALCchar* ALCAPIENTRY alcGetString(ALCdevice *pDevice,ALCenum param)
 638 {
 639     const ALCchar *value = NULL;
 640
 641     InitAL();
 642
 643     switch (param)
 644     {
 645     case ALC_NO_ERROR:
 646         value = alcNoError;
 647         break;
 648
 649     case ALC_INVALID_ENUM:
 650         value = alcErrInvalidEnum;
 651         break;
 652
 653     case ALC_INVALID_VALUE:
 654         value = alcErrInvalidValue;
 655         break;
 656
 657     case ALC_INVALID_DEVICE:
 658         value = alcErrInvalidDevice;
 659         break;
 660
 661     case ALC_INVALID_CONTEXT:
 662         value = alcErrInvalidContext;
 663         break;
 664
 665     case ALC_OUT_OF_MEMORY:
 666         value = alcErrOutOfMemory;
 667         break;
 668
 669     case ALC_DEFAULT_DEVICE_SPECIFIER:
 670         value = alcDefaultDeviceSpecifier;
 671         break;
 672
 673     case ALC_DEVICE_SPECIFIER:
 674         if (pDevice)
 675             value = pDevice->szDeviceName;
 676         else
 677             value = alcDeviceList;
 678         break;
 679
 680     case ALC_ALL_DEVICES_SPECIFIER:
 681         value = alcAllDeviceList;
 682         break;
 683
 684     case ALC_DEFAULT_ALL_DEVICES_SPECIFIER:
 685         value = alcDefaultAllDeviceSpecifier;
 686         break;
 687
 688     case ALC_CAPTURE_DEVICE_SPECIFIER:
 689         if (pDevice)
 690             value = pDevice->szDeviceName;
 691         else
 692             value = alcCaptureDeviceList;
 693         break;
 694
 695     case ALC_CAPTURE_DEFAULT_DEVICE_SPECIFIER:
 696         value = alcCaptureDefaultDeviceSpecifier;
 697         break;
 698
 699     case ALC_EXTENSIONS:
 700         value = alcExtensionList;
 701         break;
 702
 703     default:
 704         SetALCError(ALC_INVALID_ENUM);
 705         break;
 706     }
 707
 708     return value;
 709 }
 710
 711
 712 /*
 713     alcGetIntegerv
 714
 715     Returns information about the Device and the version of Open AL
 716 */
 717 ALCAPI ALCvoid ALCAPIENTRY alcGetIntegerv(ALCdevice *device,ALCenum param,ALsizei size,ALCint *data)
 718 {
 719     InitAL();
 720
 721     if ((device)&&(device->IsCaptureDevice))
 722     {
 723         SuspendContext(NULL);
 724
 725         // Capture device
 726         switch (param)
 727         {
 728         case ALC_CAPTURE_SAMPLES:
 729             if ((size) && (data))
 730                 *data = ALCdevice_AvailableSamples(device);
 731             else
 732                 SetALCError(ALC_INVALID_VALUE);
 733             break;
 734
 735         default:
 736             SetALCError(ALC_INVALID_ENUM);
 737             break;
 738         }
 739
 740         ProcessContext(NULL);
 741     }
 742     else
 743     {
 744         if(data)
 745         {
 746             // Playback Device
 747             switch (param)
 748             {
 749                 case ALC_MAJOR_VERSION:
 750                     if(!size)
 751                         SetALCError(ALC_INVALID_VALUE);
 752                     else
 753                         *data = alcMajorVersion;
 754                     break;
 755
 756                 case ALC_MINOR_VERSION:
 757                     if(!size)
 758                         SetALCError(ALC_INVALID_VALUE);
 759                     else
 760                         *data = alcMinorVersion;
 761                     break;
 762
 763                 case ALC_EFX_MAJOR_VERSION:
 764                     if(!size)
 765                         SetALCError(ALC_INVALID_VALUE);
 766                     else
 767                         *data = alcEFXMajorVersion;
 768                     break;
 769
 770                 case ALC_EFX_MINOR_VERSION:
 771                     if(!size)
 772                         SetALCError(ALC_INVALID_VALUE);
 773                     else
 774                         *data = alcEFXMinorVersion;
 775                     break;
 776
 777                 case ALC_MAX_AUXILIARY_SENDS:
 778                     if(!size)
 779                         SetALCError(ALC_INVALID_VALUE);
 780                     else
 781                         *data = MAX_SENDS;
 782                     break;
 783
 784                 case ALC_ATTRIBUTES_SIZE:
 785                     if(!device)
 786                         SetALCError(ALC_INVALID_DEVICE);
 787                     else if(!size)
 788                         SetALCError(ALC_INVALID_VALUE);
 789                     else
 790                         *data = 12;
 791                     break;
 792
 793                 case ALC_ALL_ATTRIBUTES:
 794                     if(!device)
 795                         SetALCError(ALC_INVALID_DEVICE);
 796                     else if (size < 7)
 797                         SetALCError(ALC_INVALID_VALUE);
 798                     else
 799                     {
 800                         int i = 0;
 801
 802                         data[i++] = ALC_FREQUENCY;
 803                         data[i++] = device->Frequency;
 804
 805                         data[i++] = ALC_REFRESH;
 806                         data[i++] = device->Frequency / device->UpdateSize;
 807
 808                         data[i++] = ALC_SYNC;
 809                         data[i++] = ALC_FALSE;
 810
 811                         SuspendContext(NULL);
 812                         if(device->Context && size >= 12)
 813                         {
 814                             data[i++] = ALC_MONO_SOURCES;
 815                             data[i++] = device->Context->lNumMonoSources;
 816
 817                             data[i++] = ALC_STEREO_SOURCES;
 818                             data[i++] = device->Context->lNumStereoSources;
 819
 820                             data[i++] = ALC_MAX_AUXILIARY_SENDS;
 821                             data[i++] = MAX_SENDS;
 822                         }
 823                         ProcessContext(NULL);
 824
 825                         data[i++] = 0;
 826                     }
 827                     break;
 828
 829                 case ALC_FREQUENCY:
 830                     if(!device)
 831                         SetALCError(ALC_INVALID_DEVICE);
 832                     else if(!size)
 833                         SetALCError(ALC_INVALID_VALUE);
 834                     else
 835                         *data = device->Frequency;
 836                     break;
 837
 838                 case ALC_REFRESH:
 839                     if(!device)
 840                         SetALCError(ALC_INVALID_DEVICE);
 841                     else if(!size)
 842                         SetALCError(ALC_INVALID_VALUE);
 843                     else
 844                         *data = device->Frequency / device->UpdateSize;
 845                     break;
 846
 847                 case ALC_SYNC:
 848                     if(!device)
 849                         SetALCError(ALC_INVALID_DEVICE);
 850                     else if(!size)
 851                         SetALCError(ALC_INVALID_VALUE);
 852                     else
 853                         *data = ALC_FALSE;
 854                     break;
 855
 856                 case ALC_MONO_SOURCES:
 857                     if(!device || !device->Context)
 858                         SetALCError(ALC_INVALID_DEVICE);
 859                     else if (size != 1)
 860                         SetALCError(ALC_INVALID_VALUE);
 861                     else
 862                         *data = device->Context->lNumMonoSources;
 863                     break;
 864
 865                 case ALC_STEREO_SOURCES:
 866                     if(!device || !device->Context)
 867                         SetALCError(ALC_INVALID_DEVICE);
 868                     else if (size != 1)
 869                         SetALCError(ALC_INVALID_VALUE);
 870                     else
 871                         *data = device->Context->lNumStereoSources;
 872                     break;
 873
 874                 default:
 875                     SetALCError(ALC_INVALID_ENUM);
 876                     break;
 877             }
 878         }
 879         else if(size)
 880             SetALCError(ALC_INVALID_VALUE);
 881     }
 882
 883     return;
 884 }
 885
 886
 887 /*
 888     alcIsExtensionPresent
 889
 890     Determines if there is support for a particular extension
 891 */
 892 ALCAPI ALCboolean ALCAPIENTRY alcIsExtensionPresent(ALCdevice *device, const ALCchar *extName)
 893 {
 894     ALCboolean bResult = ALC_FALSE;
 895
 896     (void)device;
 897
 898     if (extName)
 899     {
 900         const char *ptr;
 901         size_t len;
 902
 903         len = strlen(extName);
 904         ptr = alcExtensionList;
 905         while(ptr && *ptr)
 906         {
 907             if(strncasecmp(ptr, extName, len) == 0 &&
 908                (ptr[len] == '\0' || isspace(ptr[len])))
 909             {
 910                 bResult = ALC_TRUE;
 911                 break;
 912             }
 913             if((ptr=strchr(ptr, ' ')) != NULL)
 914             {
 915                 do {
 916                     ++ptr;
 917                 } while(isspace(*ptr));
 918             }
 919         }
 920     }
 921     else
 922         SetALCError(ALC_INVALID_VALUE);
 923
 924     return bResult;
 925 }
 926
 927
 928 /*
 929     alcGetProcAddress
 930
 931     Retrieves the function address for a particular extension function
 932 */
 933 ALCAPI ALCvoid *  ALCAPIENTRY alcGetProcAddress(ALCdevice *device, const ALCchar *funcName)
 934 {
 935     ALCvoid *pFunction = NULL;
 936     ALsizei i = 0;
 937
 938     (void)device;
 939
 940     if (funcName)
 941     {
 942         while(alcFunctions[i].funcName &&
 943               strcmp(alcFunctions[i].funcName,funcName) != 0)
 944             i++;
 945         pFunction = alcFunctions[i].address;
 946     }
 947     else
 948         SetALCError(ALC_INVALID_VALUE);
 949
 950     return pFunction;
 951 }
 952
 953
 954 /*
 955     alcGetEnumValue
 956
 957     Get the value for a particular ALC Enumerated Value
 958 */
 959 ALCAPI ALCenum ALCAPIENTRY alcGetEnumValue(ALCdevice *device, const ALCchar *enumName)
 960 {
 961     ALsizei i = 0;
 962     ALCenum val;
 963
 964     (void)device;
 965
 966     while ((enumeration[i].enumName)&&(strcmp(enumeration[i].enumName,enumName)))
 967         i++;
 968     val = enumeration[i].value;
 969
 970     if(!enumeration[i].enumName)
 971         SetALCError(ALC_INVALID_VALUE);
 972
 973     return val;
 974 }
 975
 976
 977 /*
 978     alcCreateContext
 979
 980     Create and attach a Context to a particular Device.
 981 */
 982 ALCAPI ALCcontext* ALCAPIENTRY alcCreateContext(ALCdevice *device, const ALCint *attrList)
 983 {
 984     ALCcontext *ALContext = NULL;
 985     ALuint      ulAttributeIndex, ulRequestedStereoSources;
 986
 987     if ((device)&&(!device->IsCaptureDevice))
 988     {
 989         // Reset Context Last Error code
 990         g_eLastContextError = ALC_NO_ERROR;
 991
 992         // Current implementation only allows one Context per Device
 993         if(!device->Context)
 994         {
 995             ALContext = calloc(1, sizeof(ALCcontext));
 996             if(!ALContext)
 997             {
 998                 SetALCError(ALC_OUT_OF_MEMORY);
 999                 return NULL;
1000             }
1001
1002             ALContext->Device = device;
1003             InitContext(ALContext);
1004
1005             device->Context = ALContext;
1006
1007             SuspendContext(NULL);
1008
1009             ALContext->next = g_pContextList;
1010             g_pContextList = ALContext;
1011             g_ulContextCount++;
1012
1013             ProcessContext(NULL);
1014
1015             // Check for Voice Count attributes
1016             if (attrList)
1017             {
1018                 ulAttributeIndex = 0;
1019                 while ((ulAttributeIndex < 10) && (attrList[ulAttributeIndex]))
1020                 {
1021                     if (attrList[ulAttributeIndex] == ALC_STEREO_SOURCES)
1022                     {
1023                         ulRequestedStereoSources = attrList[ulAttributeIndex + 1];
1024
1025                         if (ulRequestedStereoSources > ALContext->Device->MaxNoOfSources)
1026                             ulRequestedStereoSources = ALContext->Device->MaxNoOfSources;
1027
1028                         ALContext->lNumStereoSources = ulRequestedStereoSources;
1029                         ALContext->lNumMonoSources = ALContext->Device->MaxNoOfSources - ALContext->lNumStereoSources;
1030                         break;
1031                     }
1032
1033                     ulAttributeIndex += 2;
1034                 }
1035             }
1036         }
1037         else
1038         {
1039             SetALCError(ALC_INVALID_VALUE);
1040             ALContext = NULL;
1041         }
1042     }
1043     else
1044         SetALCError(ALC_INVALID_DEVICE);
1045
1046     return ALContext;
1047 }
1048
1049
1050 /*
1051     alcDestroyContext
1052
1053     Remove a Context
1054 */
1055 ALCAPI ALCvoid ALCAPIENTRY alcDestroyContext(ALCcontext *context)
1056 {
1057     ALCcontext **list;
1058
1059     InitAL();
1060
1061     // Lock context list
1062     SuspendContext(NULL);
1063
1064     if (IsContext(context))
1065     {
1066         // Lock context
1067         SuspendContext(context);
1068
1069         ReleaseALSources(context);
1070         ReleaseALAuxiliaryEffectSlots(context);
1071
1072         context->Device->Context = NULL;
1073
1074         list = &g_pContextList;
1075         while(*list != context)
1076             list = &(*list)->next;
1077
1078         *list = (*list)->next;
1079         g_ulContextCount--;
1080
1081         // Unlock context
1082         ProcessContext(context);
1083
1084         ExitContext(context);
1085
1086         // Free memory (MUST do this after ProcessContext)
1087         memset(context, 0, sizeof(ALCcontext));
1088         free(context);
1089     }
1090     else
1091         SetALCError(ALC_INVALID_CONTEXT);
1092
1093     ProcessContext(NULL);
1094 }
1095
1096
1097 /*
1098     alcGetCurrentContext
1099
1100     Returns the currently active Context
1101 */
1102 ALCAPI ALCcontext * ALCAPIENTRY alcGetCurrentContext(ALCvoid)
1103 {
1104     ALCcontext *pContext = NULL;
1105
1106     InitAL();
1107
1108     SuspendContext(NULL);
1109
1110     pContext = g_pContextList;
1111     while ((pContext) && (!pContext->InUse))
1112         pContext = pContext->next;
1113
1114     ProcessContext(NULL);
1115
1116     return pContext;
1117 }
1118
1119
1120 /*
1121     alcGetContextsDevice
1122
1123     Returns the Device that a particular Context is attached to
1124 */
1125 ALCAPI ALCdevice* ALCAPIENTRY alcGetContextsDevice(ALCcontext *pContext)
1126 {
1127     ALCdevice *pDevice = NULL;
1128
1129     InitAL();
1130
1131     SuspendContext(NULL);
1132     if (IsContext(pContext))
1133         pDevice = pContext->Device;
1134     else
1135         SetALCError(ALC_INVALID_CONTEXT);
1136     ProcessContext(NULL);
1137
1138     return pDevice;
1139 }
1140
1141
1142 /*
1143     alcMakeContextCurrent
1144
1145     Makes the given Context the active Context
1146 */
1147 ALCAPI ALCboolean ALCAPIENTRY alcMakeContextCurrent(ALCcontext *context)
1148 {
1149     ALCcontext *ALContext;
1150     ALboolean bReturn = AL_TRUE;
1151
1152     InitAL();
1153
1154     SuspendContext(NULL);
1155
1156     // context must be a valid Context or NULL
1157     if ((IsContext(context)) || (context == NULL))
1158     {
1159         if ((ALContext=alcGetCurrentContext()))
1160         {
1161             SuspendContext(ALContext);
1162             ALContext->InUse=AL_FALSE;
1163             ProcessContext(ALContext);
1164         }
1165
1166         if ((ALContext=context) && (ALContext->Device))
1167         {
1168             SuspendContext(ALContext);
1169             ALContext->InUse=AL_TRUE;
1170             ProcessContext(ALContext);
1171         }
1172     }
1173     else
1174     {
1175         SetALCError(ALC_INVALID_CONTEXT);
1176         bReturn = AL_FALSE;
1177     }
1178
1179     ProcessContext(NULL);
1180
1181     return bReturn;
1182 }
1183
1184
1185 /*
1186     alcOpenDevice
1187
1188     Open the Device specified.
1189 */
1190 ALCAPI ALCdevice* ALCAPIENTRY alcOpenDevice(const ALCchar *deviceName)
1191 {
1192     ALboolean bDeviceFound = AL_FALSE;
1193     ALCdevice *device;
1194     ALint i;
1195
1196     InitAL();
1197
1198     if(deviceName && !deviceName[0])
1199         deviceName = NULL;
1200
1201     device = malloc(sizeof(ALCdevice));
1202     if (device)
1203     {
1204         const char *fmt;
1205
1206         //Initialise device structure
1207         memset(device, 0, sizeof(ALCdevice));
1208
1209         //Validate device
1210         device->IsCaptureDevice = AL_FALSE;
1211
1212         //Set output format
1213         device->Frequency = GetConfigValueInt(NULL, "frequency", SWMIXER_OUTPUT_RATE);
1214         if((ALint)device->Frequency <= 0)
1215             device->Frequency = SWMIXER_OUTPUT_RATE;
1216
1217         fmt = GetConfigValue(NULL, "format", "AL_FORMAT_STEREO16");
1218         if(fmt[0])
1219             device->Format = alGetEnumValue(fmt);
1220
1221         if(!aluChannelsFromFormat(device->Format))
1222             device->Format = AL_FORMAT_STEREO16;
1223
1224         device->UpdateSize = GetConfigValueInt(NULL, "refresh", 4096);
1225         if((ALint)device->UpdateSize <= 0)
1226             device->UpdateSize = 4096;
1227
1228         device->MaxNoOfSources = GetConfigValueInt(NULL, "sources", 256);
1229         if((ALint)device->MaxNoOfSources <= 0)
1230             device->MaxNoOfSources = 256;
1231
1232         // Find a playback device to open
1233         for(i = 0;BackendList[i].Init;i++)
1234         {
1235             device->Funcs = &BackendList[i].Funcs;
1236             if(ALCdevice_OpenPlayback(device, deviceName))
1237             {
1238                 SuspendContext(NULL);
1239                 device->next = g_pDeviceList;
1240                 g_pDeviceList = device;
1241                 g_ulDeviceCount++;
1242                 ProcessContext(NULL);
1243
1244                 bDeviceFound = AL_TRUE;
1245                 break;
1246             }
1247         }
1248
1249         if (!bDeviceFound)
1250         {
1251             // No suitable output device found
1252             free(device);
1253             device = NULL;
1254         }
1255     }
1256
1257     return device;
1258 }
1259
1260
1261 /*
1262     alcCloseDevice
1263
1264     Close the specified Device
1265 */
1266 ALCAPI ALCboolean ALCAPIENTRY alcCloseDevice(ALCdevice *pDevice)
1267 {
1268     ALCboolean bReturn = ALC_FALSE;
1269     ALCdevice **list;
1270
1271     if ((pDevice)&&(!pDevice->IsCaptureDevice))
1272     {
1273         SuspendContext(NULL);
1274
1275         list = &g_pDeviceList;
1276         while(*list != pDevice)
1277             list = &(*list)->next;
1278
1279         *list = (*list)->next;
1280         g_ulDeviceCount--;
1281
1282         ProcessContext(NULL);
1283
1284         if(pDevice->Context)
1285         {
1286 #ifdef _DEBUG
1287             AL_PRINT("alcCloseDevice(): destroying 1 Context\n");
1288 #endif
1289             alcDestroyContext(pDevice->Context);
1290         }
1291         ALCdevice_ClosePlayback(pDevice);
1292
1293         //Release device structure
1294         memset(pDevice, 0, sizeof(ALCdevice));
1295         free(pDevice);
1296
1297         bReturn = ALC_TRUE;
1298     }
1299     else
1300         SetALCError(ALC_INVALID_DEVICE);
1301
1302     return bReturn;
1303 }
1304
1305
1306 ALCvoid ReleaseALC(ALCvoid)
1307 {
1308 #ifdef _DEBUG
1309     if(g_ulDeviceCount > 0)
1310         AL_PRINT("exit(): closing %u Device%s\n", g_ulDeviceCount, (g_ulDeviceCount>1)?"s":"");
1311 #endif
1312
1313     while(g_pDeviceList)
1314     {
1315         if(g_pDeviceList->IsCaptureDevice)
1316             alcCaptureCloseDevice(g_pDeviceList);
1317         else
1318             alcCloseDevice(g_pDeviceList);
1319     }
1320 }
1321
1322 ///////////////////////////////////////////////////////