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 #include "config.h"
  22
  23 #include <math.h>
  24 #include <stdlib.h>
  25 #include <stdio.h>
  26 #include <memory.h>
  27 #include <ctype.h>
  28 #include "alMain.h"
  29 #include "alSource.h"
  30 #include "AL/al.h"
  31 #include "AL/alc.h"
  32 #include "alThunk.h"
  33 #include "alSource.h"
  34 #include "alBuffer.h"
  35 #include "alExtension.h"
  36 #include "alAuxEffectSlot.h"
  37 #include "alDatabuffer.h"
  38 #include "bs2b.h"
  39 #include "alu.h"
  40
  41
  42 #define EmptyFuncs { NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL }
  43 typedef struct BackendInfo {
  44     const char *name;
  45     void (*Init)(BackendFuncs*);
  46     void (*Deinit)(void);
  47     void (*Probe)(int);
  48     BackendFuncs Funcs;
  49 } BackendInfo;
  50 static BackendInfo BackendList[] = {
  51 #ifdef HAVE_PULSEAUDIO
  52     { "pulse", alc_pulse_init, alc_pulse_deinit, alc_pulse_probe, EmptyFuncs },
  53 #endif
  54 #ifdef HAVE_ALSA
  55     { "alsa", alc_alsa_init, alc_alsa_deinit, alc_alsa_probe, EmptyFuncs },
  56 #endif
  57 #ifdef HAVE_OSS
  58     { "oss", alc_oss_init, alc_oss_deinit, alc_oss_probe, EmptyFuncs },
  59 #endif
  60 #ifdef HAVE_SOLARIS
  61     { "solaris", alc_solaris_init, alc_solaris_deinit, alc_solaris_probe, EmptyFuncs },
  62 #endif
  63 #ifdef HAVE_DSOUND
  64     { "dsound", alcDSoundInit, alcDSoundDeinit, alcDSoundProbe, EmptyFuncs },
  65 #endif
  66 #ifdef HAVE_WINMM
  67     { "winmm", alcWinMMInit, alcWinMMDeinit, alcWinMMProbe, EmptyFuncs },
  68 #endif
  69 #ifdef HAVE_PORTAUDIO
  70     { "port", alc_pa_init, alc_pa_deinit, alc_pa_probe, EmptyFuncs },
  71 #endif
  72
  73     { "wave", alc_wave_init, alc_wave_deinit, alc_wave_probe, EmptyFuncs },
  74
  75     { NULL, NULL, NULL, NULL, EmptyFuncs }
  76 };
  77 #undef EmptyFuncs
  78
  79 ///////////////////////////////////////////////////////
  80
  81 #define ALC_EFX_MAJOR_VERSION                              0x20001
  82 #define ALC_EFX_MINOR_VERSION                              0x20002
  83 #define ALC_MAX_AUXILIARY_SENDS                            0x20003
  84
  85 ///////////////////////////////////////////////////////
  86 // STRING and EXTENSIONS
  87
  88 typedef struct ALCfunction_struct
  89 {
  90     ALCchar        *funcName;
  91     ALvoid        *address;
  92 } ALCfunction;
  93
  94 static ALCfunction  alcFunctions[] = {
  95     { "alcCreateContext",           (ALvoid *) alcCreateContext         },
  96     { "alcMakeContextCurrent",      (ALvoid *) alcMakeContextCurrent    },
  97     { "alcProcessContext",          (ALvoid *) alcProcessContext        },
  98     { "alcSuspendContext",          (ALvoid *) alcSuspendContext        },
  99     { "alcDestroyContext",          (ALvoid *) alcDestroyContext        },
 100     { "alcGetCurrentContext",       (ALvoid *) alcGetCurrentContext     },
 101     { "alcGetContextsDevice",       (ALvoid *) alcGetContextsDevice     },
 102     { "alcOpenDevice",              (ALvoid *) alcOpenDevice            },
 103     { "alcCloseDevice",             (ALvoid *) alcCloseDevice           },
 104     { "alcGetError",                (ALvoid *) alcGetError              },
 105     { "alcIsExtensionPresent",      (ALvoid *) alcIsExtensionPresent    },
 106     { "alcGetProcAddress",          (ALvoid *) alcGetProcAddress        },
 107     { "alcGetEnumValue",            (ALvoid *) alcGetEnumValue          },
 108     { "alcGetString",               (ALvoid *) alcGetString             },
 109     { "alcGetIntegerv",             (ALvoid *) alcGetIntegerv           },
 110     { "alcCaptureOpenDevice",       (ALvoid *) alcCaptureOpenDevice     },
 111     { "alcCaptureCloseDevice",      (ALvoid *) alcCaptureCloseDevice    },
 112     { "alcCaptureStart",            (ALvoid *) alcCaptureStart          },
 113     { "alcCaptureStop",             (ALvoid *) alcCaptureStop           },
 114     { "alcCaptureSamples",          (ALvoid *) alcCaptureSamples        },
 115
 116     { "alcMakeCurrent",             (ALvoid *) alcMakeCurrent           },
 117     { "alcGetThreadContext",        (ALvoid *) alcGetThreadContext      },
 118
 119     { NULL,                         (ALvoid *) NULL                     }
 120 };
 121
 122 static ALenums enumeration[]={
 123     // Types
 124     { (ALchar *)"ALC_INVALID",                          ALC_INVALID                         },
 125     { (ALchar *)"ALC_FALSE",                            ALC_FALSE                           },
 126     { (ALchar *)"ALC_TRUE",                             ALC_TRUE                            },
 127
 128     // ALC Properties
 129     { (ALchar *)"ALC_MAJOR_VERSION",                    ALC_MAJOR_VERSION                   },
 130     { (ALchar *)"ALC_MINOR_VERSION",                    ALC_MINOR_VERSION                   },
 131     { (ALchar *)"ALC_ATTRIBUTES_SIZE",                  ALC_ATTRIBUTES_SIZE                 },
 132     { (ALchar *)"ALC_ALL_ATTRIBUTES",                   ALC_ALL_ATTRIBUTES                  },
 133     { (ALchar *)"ALC_DEFAULT_DEVICE_SPECIFIER",         ALC_DEFAULT_DEVICE_SPECIFIER        },
 134     { (ALchar *)"ALC_DEVICE_SPECIFIER",                 ALC_DEVICE_SPECIFIER                },
 135     { (ALchar *)"ALC_ALL_DEVICES_SPECIFIER",            ALC_ALL_DEVICES_SPECIFIER           },
 136     { (ALchar *)"ALC_DEFAULT_ALL_DEVICES_SPECIFIER",    ALC_DEFAULT_ALL_DEVICES_SPECIFIER   },
 137     { (ALchar *)"ALC_EXTENSIONS",                       ALC_EXTENSIONS                      },
 138     { (ALchar *)"ALC_FREQUENCY",                        ALC_FREQUENCY                       },
 139     { (ALchar *)"ALC_REFRESH",                          ALC_REFRESH                         },
 140     { (ALchar *)"ALC_SYNC",                             ALC_SYNC                            },
 141     { (ALchar *)"ALC_MONO_SOURCES",                     ALC_MONO_SOURCES                    },
 142     { (ALchar *)"ALC_STEREO_SOURCES",                   ALC_STEREO_SOURCES                  },
 143     { (ALchar *)"ALC_CAPTURE_DEVICE_SPECIFIER",         ALC_CAPTURE_DEVICE_SPECIFIER        },
 144     { (ALchar *)"ALC_CAPTURE_DEFAULT_DEVICE_SPECIFIER", ALC_CAPTURE_DEFAULT_DEVICE_SPECIFIER},
 145     { (ALchar *)"ALC_CAPTURE_SAMPLES",                  ALC_CAPTURE_SAMPLES                 },
 146
 147     // EFX Properties
 148     { (ALchar *)"ALC_EFX_MAJOR_VERSION",                ALC_EFX_MAJOR_VERSION               },
 149     { (ALchar *)"ALC_EFX_MINOR_VERSION",                ALC_EFX_MINOR_VERSION               },
 150     { (ALchar *)"ALC_MAX_AUXILIARY_SENDS",              ALC_MAX_AUXILIARY_SENDS             },
 151
 152     // ALC Error Message
 153     { (ALchar *)"ALC_NO_ERROR",                         ALC_NO_ERROR                        },
 154     { (ALchar *)"ALC_INVALID_DEVICE",                   ALC_INVALID_DEVICE                  },
 155     { (ALchar *)"ALC_INVALID_CONTEXT",                  ALC_INVALID_CONTEXT                 },
 156     { (ALchar *)"ALC_INVALID_ENUM",                     ALC_INVALID_ENUM                    },
 157     { (ALchar *)"ALC_INVALID_VALUE",                    ALC_INVALID_VALUE                   },
 158     { (ALchar *)"ALC_OUT_OF_MEMORY",                    ALC_OUT_OF_MEMORY                   },
 159     { (ALchar *)NULL,                                   (ALenum)0 }
 160 };
 161 // Error strings
 162 static const ALCchar alcNoError[] = "No Error";
 163 static const ALCchar alcErrInvalidDevice[] = "Invalid Device";
 164 static const ALCchar alcErrInvalidContext[] = "Invalid Context";
 165 static const ALCchar alcErrInvalidEnum[] = "Invalid Enum";
 166 static const ALCchar alcErrInvalidValue[] = "Invalid Value";
 167 static const ALCchar alcErrOutOfMemory[] = "Out of Memory";
 168
 169 /* Device lists. Sizes only include the first ending null character, not the
 170  * second */
 171 static ALCchar *alcDeviceList;
 172 static ALCuint alcDeviceListSize;
 173 static ALCchar *alcAllDeviceList;
 174 static ALCuint alcAllDeviceListSize;
 175 static ALCchar *alcCaptureDeviceList;
 176 static ALCuint alcCaptureDeviceListSize;
 177 // Default is always the first in the list
 178 static ALCchar *alcDefaultDeviceSpecifier;
 179 static ALCchar *alcDefaultAllDeviceSpecifier;
 180 static ALCchar *alcCaptureDefaultDeviceSpecifier;
 181
 182
 183 static const ALCchar alcExtensionList[] =
 184     "ALC_ENUMERATE_ALL_EXT ALC_ENUMERATION_EXT ALC_EXT_CAPTURE "
 185     "ALC_EXT_disconnect ALC_EXT_EFX ALC_EXTX_thread_local_context";
 186 static const ALCint alcMajorVersion = 1;
 187 static const ALCint alcMinorVersion = 1;
 188
 189 static const ALCint alcEFXMajorVersion = 1;
 190 static const ALCint alcEFXMinorVersion = 0;
 191
 192 ///////////////////////////////////////////////////////
 193
 194
 195 ///////////////////////////////////////////////////////
 196 // Global Variables
 197
 198 static ALCdevice *g_pDeviceList = NULL;
 199 static ALCuint    g_ulDeviceCount = 0;
 200
 201 static CRITICAL_SECTION g_csMutex;
 202
 203 // Context List
 204 static ALCcontext *g_pContextList = NULL;
 205 static ALCuint     g_ulContextCount = 0;
 206
 207 // Thread-local current context
 208 static tls_type LocalContext;
 209
 210 // Context Error
 211 static ALCenum g_eLastContextError = ALC_NO_ERROR;
 212
 213 // Default context extensions
 214 static const ALchar alExtList[] =
 215     "AL_EXTX_buffer_sub_data AL_EXT_EXPONENT_DISTANCE AL_EXT_FLOAT32 "
 216     "AL_EXT_IMA4 AL_EXT_LINEAR_DISTANCE AL_EXT_MCFORMATS AL_EXT_OFFSET "
 217     "AL_EXTX_sample_buffer_object AL_EXT_source_distance_model "
 218     "AL_LOKI_quadriphonic";
 219
 220 // Mixing Priority Level
 221 ALint RTPrioLevel;
 222
 223 // Resampler Quality
 224 resampler_t DefaultResampler;
 225
 226 ///////////////////////////////////////////////////////
 227
 228
 229 ///////////////////////////////////////////////////////
 230 // ALC Related helper functions
 231 #ifdef _WIN32
 232 static void alc_init(void);
 233 static void alc_deinit(void);
 234
 235 BOOL APIENTRY DllMain(HANDLE hModule,DWORD ul_reason_for_call,LPVOID lpReserved)
 236 {
 237     (void)lpReserved;
 238
 239     // Perform actions based on the reason for calling.
 240     switch(ul_reason_for_call)
 241     {
 242         case DLL_PROCESS_ATTACH:
 243             DisableThreadLibraryCalls(hModule);
 244             alc_init();
 245             break;
 246
 247         case DLL_PROCESS_DETACH:
 248             alc_deinit();
 249             break;
 250     }
 251     return TRUE;
 252 }
 253 #else
 254 #ifdef HAVE_GCC_DESTRUCTOR
 255 static void alc_init(void) __attribute__((constructor));
 256 static void alc_deinit(void) __attribute__((destructor));
 257 #endif
 258 #endif
 259
 260 static void alc_init(void)
 261 {
 262     int i;
 263     const char *devs, *str;
 264
 265     InitializeCriticalSection(&g_csMutex);
 266     ALTHUNK_INIT();
 267     ReadALConfig();
 268
 269     tls_create(&LocalContext);
 270
 271     RTPrioLevel = GetConfigValueInt(NULL, "rt-prio", 0);
 272
 273     DefaultResampler = GetConfigValueInt(NULL, "resampler", RESAMPLER_DEFAULT);
 274     if(DefaultResampler >= RESAMPLER_MAX || DefaultResampler <= RESAMPLER_MIN)
 275         DefaultResampler = RESAMPLER_DEFAULT;
 276
 277     devs = GetConfigValue(NULL, "drivers", "");
 278     if(devs[0])
 279     {
 280         int n;
 281         size_t len;
 282         const char *next = devs;
 283         int endlist;
 284
 285         i = 0;
 286         do {
 287             devs = next;
 288             next = strchr(devs, ',');
 289
 290             if(!devs[0] || devs[0] == ',')
 291             {
 292                 endlist = 0;
 293                 continue;
 294             }
 295             endlist = 1;
 296
 297             len = (next ? ((size_t)(next-devs)) : strlen(devs));
 298             for(n = i;BackendList[n].Init;n++)
 299             {
 300                 if(len == strlen(BackendList[n].name) &&
 301                    strncmp(BackendList[n].name, devs, len) == 0)
 302                 {
 303                     BackendInfo Bkp = BackendList[n];
 304                     while(n > i)
 305                     {
 306                         BackendList[n] = BackendList[n-1];
 307                         --n;
 308                     }
 309                     BackendList[n] = Bkp;
 310
 311                     i++;
 312                     break;
 313                 }
 314             }
 315         } while(next++);
 316
 317         if(endlist)
 318         {
 319             BackendList[i].name = NULL;
 320             BackendList[i].Init = NULL;
 321             BackendList[i].Deinit = NULL;
 322             BackendList[i].Probe = NULL;
 323         }
 324     }
 325
 326     for(i = 0;BackendList[i].Init;i++)
 327         BackendList[i].Init(&BackendList[i].Funcs);
 328
 329     DuplicateStereo = GetConfigValueBool(NULL, "stereodup", 0);
 330
 331     str = GetConfigValue(NULL, "excludefx", "");
 332     if(str[0])
 333     {
 334         const struct {
 335             const char *name;
 336             int type;
 337         } EffectList[] = {
 338             { "eaxreverb", EAXREVERB },
 339             { "reverb", REVERB },
 340             { "echo", ECHO },
 341             { NULL, 0 }
 342         };
 343         int n;
 344         size_t len;
 345         const char *next = str;
 346
 347         do {
 348             str = next;
 349             next = strchr(str, ',');
 350
 351             if(!str[0] || next == str)
 352                 continue;
 353
 354             len = (next ? ((size_t)(next-str)) : strlen(str));
 355             for(n = 0;EffectList[n].name;n++)
 356             {
 357                 if(len == strlen(EffectList[n].name) &&
 358                    strncmp(EffectList[n].name, str, len) == 0)
 359                     DisabledEffects[EffectList[n].type] = AL_TRUE;
 360             }
 361         } while(next++);
 362     }
 363 }
 364
 365 static void alc_deinit(void)
 366 {
 367     int i;
 368
 369     ReleaseALC();
 370
 371     for(i = 0;BackendList[i].Deinit;i++)
 372         BackendList[i].Deinit();
 373
 374     tls_delete(LocalContext);
 375
 376     FreeALConfig();
 377     ALTHUNK_EXIT();
 378     DeleteCriticalSection(&g_csMutex);
 379 }
 380
 381
 382 static void ProbeDeviceList()
 383 {
 384     ALint i;
 385
 386     free(alcDeviceList); alcDeviceList = NULL;
 387     alcDeviceListSize = 0;
 388
 389     for(i = 0;BackendList[i].Probe;i++)
 390         BackendList[i].Probe(DEVICE_PROBE);
 391 }
 392
 393 static void ProbeAllDeviceList()
 394 {
 395     ALint i;
 396
 397     free(alcAllDeviceList); alcAllDeviceList = NULL;
 398     alcAllDeviceListSize = 0;
 399
 400     for(i = 0;BackendList[i].Probe;i++)
 401         BackendList[i].Probe(ALL_DEVICE_PROBE);
 402 }
 403
 404 static void ProbeCaptureDeviceList()
 405 {
 406     ALint i;
 407
 408     free(alcCaptureDeviceList); alcCaptureDeviceList = NULL;
 409     alcCaptureDeviceListSize = 0;
 410
 411     for(i = 0;BackendList[i].Probe;i++)
 412         BackendList[i].Probe(CAPTURE_DEVICE_PROBE);
 413 }
 414
 415
 416 #define DECL_APPEND_LIST_FUNC(type)                                          \
 417 void Append##type##List(const ALCchar *name)                                 \
 418 {                                                                            \
 419     ALCuint len = strlen(name);                                              \
 420     void *temp;                                                              \
 421                                                                              \
 422     if(len == 0)                                                             \
 423         return;                                                              \
 424                                                                              \
 425     temp = realloc(alc##type##List, alc##type##ListSize + len + 2);          \
 426     if(!temp)                                                                \
 427     {                                                                        \
 428         AL_PRINT("Realloc failed to add %s!\n", name);                       \
 429         return;                                                              \
 430     }                                                                        \
 431     alc##type##List = temp;                                                  \
 432     sprintf(alc##type##List+alc##type##ListSize, "%s", name);                \
 433     alc##type##ListSize += len+1;                                            \
 434     alc##type##List[alc##type##ListSize] = 0;                                \
 435 }
 436
 437 DECL_APPEND_LIST_FUNC(Device)
 438 DECL_APPEND_LIST_FUNC(AllDevice)
 439 DECL_APPEND_LIST_FUNC(CaptureDevice)
 440
 441
 442 void al_print(const char *fname, unsigned int line, const char *fmt, ...)
 443 {
 444     const char *fn;
 445     char str[256];
 446     int i;
 447
 448     fn = strrchr(fname, '/');
 449     if(!fn) fn = strrchr(fname, '\\');;
 450     if(!fn) fn = fname;
 451     else fn += 1;
 452
 453     i = snprintf(str, sizeof(str), "AL lib: %s:%d: ", fn, line);
 454     if(i < (int)sizeof(str) && i > 0)
 455     {
 456         va_list ap;
 457         va_start(ap, fmt);
 458         vsnprintf(str+i, sizeof(str)-i, fmt, ap);
 459         va_end(ap);
 460     }
 461     str[sizeof(str)-1] = 0;
 462
 463     fprintf(stderr, "%s", str);
 464 }
 465
 466 void EnableRTPrio(ALint level)
 467 {
 468     ALboolean failed;
 469
 470 #ifdef _WIN32
 471     if(level > 0)
 472         failed = !SetThreadPriority(GetCurrentThread(), THREAD_PRIORITY_TIME_CRITICAL);
 473     else
 474         failed = !SetThreadPriority(GetCurrentThread(), THREAD_PRIORITY_NORMAL);
 475 #elif defined(HAVE_PTHREAD_SETSCHEDPARAM)
 476     struct sched_param param;
 477
 478     if(level > 0)
 479     {
 480         /* Use the minimum real-time priority possible for now (on Linux this
 481          * should be 1 for SCHED_RR) */
 482         param.sched_priority = sched_get_priority_min(SCHED_RR);
 483         failed = !!pthread_setschedparam(pthread_self(), SCHED_RR, &param);
 484     }
 485     else
 486     {
 487         param.sched_priority = 0;
 488         failed = !!pthread_setschedparam(pthread_self(), SCHED_OTHER, &param);
 489     }
 490 #else
 491     /* Real-time priority not available */
 492     failed = !!level;
 493 #endif
 494     if(failed)
 495         AL_PRINT("Failed to set priority level for thread\n");
 496 }
 497
 498
 499 /*
 500     IsDevice
 501
 502     Check pDevice is a valid Device pointer
 503 */
 504 static ALCboolean IsDevice(ALCdevice *pDevice)
 505 {
 506     ALCdevice *pTempDevice;
 507
 508     SuspendContext(NULL);
 509
 510     pTempDevice = g_pDeviceList;
 511     while(pTempDevice && pTempDevice != pDevice)
 512         pTempDevice = pTempDevice->next;
 513
 514     ProcessContext(NULL);
 515
 516     return (pTempDevice ? ALC_TRUE : ALC_FALSE);
 517 }
 518
 519 /*
 520     IsContext
 521
 522     Check pContext is a valid Context pointer
 523 */
 524 static ALCboolean IsContext(ALCcontext *pContext)
 525 {
 526     ALCcontext *pTempContext;
 527
 528     SuspendContext(NULL);
 529
 530     pTempContext = g_pContextList;
 531     while (pTempContext && pTempContext != pContext)
 532         pTempContext = pTempContext->next;
 533
 534     ProcessContext(NULL);
 535
 536     return (pTempContext ? ALC_TRUE : ALC_FALSE);
 537 }
 538
 539
 540 /*
 541     alcSetError
 542
 543     Store latest ALC Error
 544 */
 545 ALCvoid alcSetError(ALCdevice *device, ALenum errorCode)
 546 {
 547     if(IsDevice(device))
 548         device->LastError = errorCode;
 549     else
 550         g_eLastContextError = errorCode;
 551 }
 552
 553
 554 /*
 555     SuspendContext
 556
 557     Thread-safe entry
 558 */
 559 ALCvoid SuspendContext(ALCcontext *pContext)
 560 {
 561     (void)pContext;
 562     EnterCriticalSection(&g_csMutex);
 563 }
 564
 565
 566 /*
 567     ProcessContext
 568
 569     Thread-safe exit
 570 */
 571 ALCvoid ProcessContext(ALCcontext *pContext)
 572 {
 573     (void)pContext;
 574     LeaveCriticalSection(&g_csMutex);
 575 }
 576
 577
 578 /*
 579     GetContextSuspended
 580
 581     Returns the currently active Context, in a locked state
 582 */
 583 ALCcontext *GetContextSuspended(void)
 584 {
 585     ALCcontext *pContext = NULL;
 586
 587     SuspendContext(NULL);
 588
 589     pContext = tls_get(LocalContext);
 590     if(pContext && !IsContext(pContext))
 591     {
 592         tls_set(LocalContext, NULL);
 593         pContext = NULL;
 594     }
 595     if(!pContext)
 596     {
 597         pContext = g_pContextList;
 598         while(pContext && !pContext->InUse)
 599             pContext = pContext->next;
 600     }
 601     if(pContext)
 602         SuspendContext(pContext);
 603
 604     ProcessContext(NULL);
 605
 606     return pContext;
 607 }
 608
 609
 610 /*
 611     InitContext
 612
 613     Initialize Context variables
 614 */
 615 static ALvoid InitContext(ALCcontext *pContext)
 616 {
 617     //Initialise listener
 618     pContext->Listener.Gain = 1.0f;
 619     pContext->Listener.MetersPerUnit = 1.0f;
 620     pContext->Listener.Position[0] = 0.0f;
 621     pContext->Listener.Position[1] = 0.0f;
 622     pContext->Listener.Position[2] = 0.0f;
 623     pContext->Listener.Velocity[0] = 0.0f;
 624     pContext->Listener.Velocity[1] = 0.0f;
 625     pContext->Listener.Velocity[2] = 0.0f;
 626     pContext->Listener.Forward[0] = 0.0f;
 627     pContext->Listener.Forward[1] = 0.0f;
 628     pContext->Listener.Forward[2] = -1.0f;
 629     pContext->Listener.Up[0] = 0.0f;
 630     pContext->Listener.Up[1] = 1.0f;
 631     pContext->Listener.Up[2] = 0.0f;
 632
 633     //Validate pContext
 634     pContext->LastError = AL_NO_ERROR;
 635     pContext->InUse = AL_FALSE;
 636     pContext->Suspended = AL_FALSE;
 637
 638     //Set globals
 639     pContext->DistanceModel = AL_INVERSE_DISTANCE_CLAMPED;
 640     pContext->SourceDistanceModel = AL_FALSE;
 641     pContext->DopplerFactor = 1.0f;
 642     pContext->DopplerVelocity = 1.0f;
 643     pContext->flSpeedOfSound = SPEEDOFSOUNDMETRESPERSEC;
 644
 645     pContext->ExtensionList = alExtList;
 646 }
 647
 648
 649 /*
 650     ExitContext
 651
 652     Clean up Context, destroy any remaining Sources
 653 */
 654 static ALCvoid ExitContext(ALCcontext *pContext)
 655 {
 656     //Invalidate context
 657     pContext->LastError = AL_NO_ERROR;
 658     pContext->InUse = AL_FALSE;
 659 }
 660
 661 ///////////////////////////////////////////////////////
 662
 663
 664 ///////////////////////////////////////////////////////
 665 // ALC Functions calls
 666
 667
 668 // This should probably move to another c file but for now ...
 669 ALCAPI ALCdevice* ALCAPIENTRY alcCaptureOpenDevice(const ALCchar *deviceName, ALCuint frequency, ALCenum format, ALCsizei SampleSize)
 670 {
 671     ALCboolean DeviceFound = ALC_FALSE;
 672     ALCdevice *pDevice = NULL;
 673     ALCint i;
 674
 675     if(SampleSize <= 0)
 676     {
 677         alcSetError(NULL, ALC_INVALID_VALUE);
 678         return NULL;
 679     }
 680
 681     if(deviceName && !deviceName[0])
 682         deviceName = NULL;
 683
 684     pDevice = malloc(sizeof(ALCdevice));
 685     if (pDevice)
 686     {
 687         //Initialise device structure
 688         memset(pDevice, 0, sizeof(ALCdevice));
 689
 690         //Validate device
 691         pDevice->Connected = ALC_TRUE;
 692         pDevice->IsCaptureDevice = AL_TRUE;
 693
 694         pDevice->szDeviceName = NULL;
 695
 696         pDevice->Frequency = frequency;
 697         pDevice->Format = format;
 698         pDevice->UpdateSize = SampleSize;
 699         pDevice->NumUpdates = 1;
 700
 701         SuspendContext(NULL);
 702         for(i = 0;BackendList[i].Init;i++)
 703         {
 704             pDevice->Funcs = &BackendList[i].Funcs;
 705             if(ALCdevice_OpenCapture(pDevice, deviceName))
 706             {
 707                 pDevice->next = g_pDeviceList;
 708                 g_pDeviceList = pDevice;
 709                 g_ulDeviceCount++;
 710
 711                 DeviceFound = ALC_TRUE;
 712                 break;
 713             }
 714         }
 715         ProcessContext(NULL);
 716
 717         if(!DeviceFound)
 718         {
 719             alcSetError(NULL, ALC_INVALID_VALUE);
 720             free(pDevice);
 721             pDevice = NULL;
 722         }
 723     }
 724     else
 725         alcSetError(NULL, ALC_OUT_OF_MEMORY);
 726
 727     return pDevice;
 728 }
 729
 730 ALCAPI ALCboolean ALCAPIENTRY alcCaptureCloseDevice(ALCdevice *pDevice)
 731 {
 732     ALCboolean bReturn = ALC_FALSE;
 733     ALCdevice **list;
 734
 735     if(IsDevice(pDevice) && pDevice->IsCaptureDevice)
 736     {
 737         SuspendContext(NULL);
 738
 739         list = &g_pDeviceList;
 740         while(*list != pDevice)
 741             list = &(*list)->next;
 742
 743         *list = (*list)->next;
 744         g_ulDeviceCount--;
 745
 746         ProcessContext(NULL);
 747
 748         ALCdevice_CloseCapture(pDevice);
 749
 750         free(pDevice->szDeviceName);
 751         pDevice->szDeviceName = NULL;
 752
 753         free(pDevice);
 754
 755         bReturn = ALC_TRUE;
 756     }
 757     else
 758         alcSetError(pDevice, ALC_INVALID_DEVICE);
 759
 760     return bReturn;
 761 }
 762
 763 ALCAPI void ALCAPIENTRY alcCaptureStart(ALCdevice *pDevice)
 764 {
 765     if(IsDevice(pDevice) && pDevice->IsCaptureDevice)
 766         ALCdevice_StartCapture(pDevice);
 767     else
 768         alcSetError(pDevice, ALC_INVALID_DEVICE);
 769 }
 770
 771 ALCAPI void ALCAPIENTRY alcCaptureStop(ALCdevice *pDevice)
 772 {
 773     if(IsDevice(pDevice) && pDevice->IsCaptureDevice)
 774         ALCdevice_StopCapture(pDevice);
 775     else
 776         alcSetError(pDevice, ALC_INVALID_DEVICE);
 777 }
 778
 779 ALCAPI void ALCAPIENTRY alcCaptureSamples(ALCdevice *pDevice, ALCvoid *pBuffer, ALCsizei lSamples)
 780 {
 781     if(IsDevice(pDevice) && pDevice->IsCaptureDevice)
 782         ALCdevice_CaptureSamples(pDevice, pBuffer, lSamples);
 783     else
 784         alcSetError(pDevice, ALC_INVALID_DEVICE);
 785 }
 786
 787 /*
 788     alcGetError
 789
 790     Return last ALC generated error code
 791 */
 792 ALCAPI ALCenum ALCAPIENTRY alcGetError(ALCdevice *device)
 793 {
 794     ALCenum errorCode = ALC_NO_ERROR;
 795
 796     if(IsDevice(device))
 797     {
 798         errorCode = device->LastError;
 799         device->LastError = ALC_NO_ERROR;
 800     }
 801     else
 802     {
 803         errorCode = g_eLastContextError;
 804         g_eLastContextError = ALC_NO_ERROR;
 805     }
 806     return errorCode;
 807 }
 808
 809
 810 /*
 811     alcSuspendContext
 812
 813     Not functional
 814 */
 815 ALCAPI ALCvoid ALCAPIENTRY alcSuspendContext(ALCcontext *pContext)
 816 {
 817     SuspendContext(NULL);
 818     if(IsContext(pContext))
 819         pContext->Suspended = AL_TRUE;
 820     ProcessContext(NULL);
 821 }
 822
 823
 824 /*
 825     alcProcessContext
 826
 827     Not functional
 828 */
 829 ALCAPI ALCvoid ALCAPIENTRY alcProcessContext(ALCcontext *pContext)
 830 {
 831     SuspendContext(NULL);
 832     if(IsContext(pContext))
 833         pContext->Suspended = AL_FALSE;
 834     ProcessContext(NULL);
 835 }
 836
 837
 838 /*
 839     alcGetString
 840
 841     Returns information about the Device, and error strings
 842 */
 843 ALCAPI const ALCchar* ALCAPIENTRY alcGetString(ALCdevice *pDevice,ALCenum param)
 844 {
 845     const ALCchar *value = NULL;
 846
 847     switch (param)
 848     {
 849     case ALC_NO_ERROR:
 850         value = alcNoError;
 851         break;
 852
 853     case ALC_INVALID_ENUM:
 854         value = alcErrInvalidEnum;
 855         break;
 856
 857     case ALC_INVALID_VALUE:
 858         value = alcErrInvalidValue;
 859         break;
 860
 861     case ALC_INVALID_DEVICE:
 862         value = alcErrInvalidDevice;
 863         break;
 864
 865     case ALC_INVALID_CONTEXT:
 866         value = alcErrInvalidContext;
 867         break;
 868
 869     case ALC_OUT_OF_MEMORY:
 870         value = alcErrOutOfMemory;
 871         break;
 872
 873     case ALC_DEVICE_SPECIFIER:
 874         if(IsDevice(pDevice))
 875             value = pDevice->szDeviceName;
 876         else
 877         {
 878             ProbeDeviceList();
 879             value = alcDeviceList;
 880         }
 881         break;
 882
 883     case ALC_ALL_DEVICES_SPECIFIER:
 884         ProbeAllDeviceList();
 885         value = alcAllDeviceList;
 886         break;
 887
 888     case ALC_CAPTURE_DEVICE_SPECIFIER:
 889         if(IsDevice(pDevice))
 890             value = pDevice->szDeviceName;
 891         else
 892         {
 893             ProbeCaptureDeviceList();
 894             value = alcCaptureDeviceList;
 895         }
 896         break;
 897
 898     /* Default devices are always first in the list */
 899     case ALC_DEFAULT_DEVICE_SPECIFIER:
 900         if(!alcDeviceList)
 901             ProbeDeviceList();
 902
 903         free(alcDefaultDeviceSpecifier);
 904         alcDefaultDeviceSpecifier = strdup(alcDeviceList ? alcDeviceList : "");
 905         if(!alcDefaultDeviceSpecifier)
 906             alcSetError(pDevice, ALC_OUT_OF_MEMORY);
 907         value = alcDefaultDeviceSpecifier;
 908         break;
 909
 910     case ALC_DEFAULT_ALL_DEVICES_SPECIFIER:
 911         if(!alcAllDeviceList)
 912             ProbeAllDeviceList();
 913
 914         free(alcDefaultAllDeviceSpecifier);
 915         alcDefaultAllDeviceSpecifier = strdup(alcAllDeviceList ?
 916                                               alcAllDeviceList : "");
 917         if(!alcDefaultAllDeviceSpecifier)
 918             alcSetError(pDevice, ALC_OUT_OF_MEMORY);
 919         value = alcDefaultAllDeviceSpecifier;
 920         break;
 921
 922     case ALC_CAPTURE_DEFAULT_DEVICE_SPECIFIER:
 923         if(!alcCaptureDeviceList)
 924             ProbeCaptureDeviceList();
 925
 926         free(alcCaptureDefaultDeviceSpecifier);
 927         alcCaptureDefaultDeviceSpecifier = strdup(alcCaptureDeviceList ?
 928                                                   alcCaptureDeviceList : "");
 929         if(!alcCaptureDefaultDeviceSpecifier)
 930             alcSetError(pDevice, ALC_OUT_OF_MEMORY);
 931         value = alcCaptureDefaultDeviceSpecifier;
 932         break;
 933
 934     case ALC_EXTENSIONS:
 935         value = alcExtensionList;
 936         break;
 937
 938     default:
 939         alcSetError(pDevice, ALC_INVALID_ENUM);
 940         break;
 941     }
 942
 943     return value;
 944 }
 945
 946
 947 /*
 948     alcGetIntegerv
 949
 950     Returns information about the Device and the version of Open AL
 951 */
 952 ALCAPI ALCvoid ALCAPIENTRY alcGetIntegerv(ALCdevice *device,ALCenum param,ALsizei size,ALCint *data)
 953 {
 954     if(size == 0 || data == NULL)
 955     {
 956         alcSetError(device, ALC_INVALID_VALUE);
 957         return;
 958     }
 959
 960     if(IsDevice(device) && device->IsCaptureDevice)
 961     {
 962         SuspendContext(NULL);
 963
 964         // Capture device
 965         switch (param)
 966         {
 967         case ALC_CAPTURE_SAMPLES:
 968             *data = ALCdevice_AvailableSamples(device);
 969             break;
 970
 971         case ALC_CONNECTED:
 972             *data = device->Connected;
 973             break;
 974
 975         default:
 976             alcSetError(device, ALC_INVALID_ENUM);
 977             break;
 978         }
 979
 980         ProcessContext(NULL);
 981         return;
 982     }
 983
 984     // Playback Device
 985     switch (param)
 986     {
 987         case ALC_MAJOR_VERSION:
 988             *data = alcMajorVersion;
 989             break;
 990
 991         case ALC_MINOR_VERSION:
 992             *data = alcMinorVersion;
 993             break;
 994
 995         case ALC_EFX_MAJOR_VERSION:
 996             *data = alcEFXMajorVersion;
 997             break;
 998
 999         case ALC_EFX_MINOR_VERSION:
1000             *data = alcEFXMinorVersion;
1001             break;
1002
1003         case ALC_MAX_AUXILIARY_SENDS:
1004             if(!IsDevice(device))
1005                 alcSetError(device, ALC_INVALID_DEVICE);
1006             else
1007                 *data = device->NumAuxSends;
1008             break;
1009
1010         case ALC_ATTRIBUTES_SIZE:
1011             if(!IsDevice(device))
1012                 alcSetError(device, ALC_INVALID_DEVICE);
1013             else
1014                 *data = 13;
1015             break;
1016
1017         case ALC_ALL_ATTRIBUTES:
1018             if(!IsDevice(device))
1019                 alcSetError(device, ALC_INVALID_DEVICE);
1020             else if (size < 13)
1021                 alcSetError(device, ALC_INVALID_VALUE);
1022             else
1023             {
1024                 int i = 0;
1025
1026                 SuspendContext(NULL);
1027                 data[i++] = ALC_FREQUENCY;
1028                 data[i++] = device->Frequency;
1029
1030                 data[i++] = ALC_REFRESH;
1031                 data[i++] = device->Frequency / device->UpdateSize;
1032
1033                 data[i++] = ALC_SYNC;
1034                 data[i++] = ALC_FALSE;
1035
1036                 data[i++] = ALC_MONO_SOURCES;
1037                 data[i++] = device->lNumMonoSources;
1038
1039                 data[i++] = ALC_STEREO_SOURCES;
1040                 data[i++] = device->lNumStereoSources;
1041
1042                 data[i++] = ALC_MAX_AUXILIARY_SENDS;
1043                 data[i++] = device->NumAuxSends;
1044
1045                 data[i++] = 0;
1046                 ProcessContext(NULL);
1047             }
1048             break;
1049
1050         case ALC_FREQUENCY:
1051             if(!IsDevice(device))
1052                 alcSetError(device, ALC_INVALID_DEVICE);
1053             else
1054                 *data = device->Frequency;
1055             break;
1056
1057         case ALC_REFRESH:
1058             if(!IsDevice(device))
1059                 alcSetError(device, ALC_INVALID_DEVICE);
1060             else
1061                 *data = device->Frequency / device->UpdateSize;
1062             break;
1063
1064         case ALC_SYNC:
1065             if(!IsDevice(device))
1066                 alcSetError(device, ALC_INVALID_DEVICE);
1067             else
1068                 *data = ALC_FALSE;
1069             break;
1070
1071         case ALC_MONO_SOURCES:
1072             if(!IsDevice(device))
1073                 alcSetError(device, ALC_INVALID_DEVICE);
1074             else
1075                 *data = device->lNumMonoSources;
1076             break;
1077
1078         case ALC_STEREO_SOURCES:
1079             if(!IsDevice(device))
1080                 alcSetError(device, ALC_INVALID_DEVICE);
1081             else
1082                 *data = device->lNumStereoSources;
1083             break;
1084
1085         case ALC_CONNECTED:
1086             if(!IsDevice(device))
1087                 alcSetError(device, ALC_INVALID_DEVICE);
1088             else
1089                 *data = device->Connected;
1090             break;
1091
1092         default:
1093             alcSetError(device, ALC_INVALID_ENUM);
1094             break;
1095     }
1096 }
1097
1098
1099 /*
1100     alcIsExtensionPresent
1101
1102     Determines if there is support for a particular extension
1103 */
1104 ALCAPI ALCboolean ALCAPIENTRY alcIsExtensionPresent(ALCdevice *device, const ALCchar *extName)
1105 {
1106     ALCboolean bResult = ALC_FALSE;
1107
1108     if (extName)
1109     {
1110         const char *ptr;
1111         size_t len;
1112
1113         len = strlen(extName);
1114         ptr = alcExtensionList;
1115         while(ptr && *ptr)
1116         {
1117             if(strncasecmp(ptr, extName, len) == 0 &&
1118                (ptr[len] == '\0' || isspace(ptr[len])))
1119             {
1120                 bResult = ALC_TRUE;
1121                 break;
1122             }
1123             if((ptr=strchr(ptr, ' ')) != NULL)
1124             {
1125                 do {
1126                     ++ptr;
1127                 } while(isspace(*ptr));
1128             }
1129         }
1130     }
1131     else
1132         alcSetError(device, ALC_INVALID_VALUE);
1133
1134     return bResult;
1135 }
1136
1137
1138 /*
1139     alcGetProcAddress
1140
1141     Retrieves the function address for a particular extension function
1142 */
1143 ALCAPI ALCvoid *  ALCAPIENTRY alcGetProcAddress(ALCdevice *device, const ALCchar *funcName)
1144 {
1145     ALCvoid *pFunction = NULL;
1146     ALsizei i = 0;
1147
1148     if (funcName)
1149     {
1150         while(alcFunctions[i].funcName &&
1151               strcmp(alcFunctions[i].funcName,funcName) != 0)
1152             i++;
1153         pFunction = alcFunctions[i].address;
1154     }
1155     else
1156         alcSetError(device, ALC_INVALID_VALUE);
1157
1158     return pFunction;
1159 }
1160
1161
1162 /*
1163     alcGetEnumValue
1164
1165     Get the value for a particular ALC Enumerated Value
1166 */
1167 ALCAPI ALCenum ALCAPIENTRY alcGetEnumValue(ALCdevice *device, const ALCchar *enumName)
1168 {
1169     ALsizei i = 0;
1170     ALCenum val;
1171
1172     while ((enumeration[i].enumName)&&(strcmp(enumeration[i].enumName,enumName)))
1173         i++;
1174     val = enumeration[i].value;
1175
1176     if(!enumeration[i].enumName)
1177         alcSetError(device, ALC_INVALID_VALUE);
1178
1179     return val;
1180 }
1181
1182
1183 /*
1184     alcCreateContext
1185
1186     Create and attach a Context to a particular Device.
1187 */
1188 ALCAPI ALCcontext* ALCAPIENTRY alcCreateContext(ALCdevice *device, const ALCint *attrList)
1189 {
1190     ALuint attrIdx, reqStereoSources;
1191     ALCcontext *ALContext;
1192     void *temp;
1193     ALuint i;
1194
1195     SuspendContext(NULL);
1196
1197     if(!IsDevice(device) || device->IsCaptureDevice || !device->Connected)
1198     {
1199         alcSetError(device, ALC_INVALID_DEVICE);
1200         ProcessContext(NULL);
1201         return NULL;
1202     }
1203
1204     // Reset Context Last Error code
1205     device->LastError = ALC_NO_ERROR;
1206
1207     // If a context is already running on the device, stop playback so the
1208     // device attributes can be updated
1209     if(device->NumContexts > 0)
1210     {
1211         ProcessContext(NULL);
1212         ALCdevice_StopPlayback(device);
1213         SuspendContext(NULL);
1214     }
1215
1216     // Check for attributes
1217     if(attrList)
1218     {
1219         ALCint level = device->Bs2bLevel;
1220         ALCuint freq = device->Frequency;
1221         ALCint numMono = device->lNumMonoSources;
1222         ALCint numStereo = device->lNumStereoSources;
1223         ALCuint numSends = device->NumAuxSends;
1224
1225         attrIdx = 0;
1226         while(attrList[attrIdx])
1227         {
1228             if(attrList[attrIdx] == ALC_FREQUENCY &&
1229                !ConfigValueExists(NULL, "frequency"))
1230             {
1231                 freq = attrList[attrIdx + 1];
1232                 if(freq < 8000)
1233                     freq = 8000;
1234             }
1235
1236             if(attrList[attrIdx] == ALC_STEREO_SOURCES)
1237             {
1238                 reqStereoSources = attrList[attrIdx + 1];
1239                 if(reqStereoSources > device->MaxNoOfSources)
1240                     reqStereoSources = device->MaxNoOfSources;
1241
1242                 numStereo = reqStereoSources;
1243                 numMono = device->MaxNoOfSources - numStereo;
1244             }
1245
1246             if(attrList[attrIdx] == ALC_MAX_AUXILIARY_SENDS &&
1247                !ConfigValueExists(NULL, "sends"))
1248             {
1249                 numSends = attrList[attrIdx + 1];
1250                 if(numSends > MAX_SENDS)
1251                     numSends = MAX_SENDS;
1252             }
1253
1254             attrIdx += 2;
1255         }
1256
1257         device->UpdateSize = (ALuint64)device->UpdateSize * freq /
1258                              device->Frequency;
1259
1260         device->Bs2bLevel = level;
1261         device->Frequency = freq;
1262         device->lNumMonoSources = numMono;
1263         device->lNumStereoSources = numStereo;
1264         device->NumAuxSends = numSends;
1265     }
1266
1267     if(ALCdevice_ResetPlayback(device) == ALC_FALSE)
1268     {
1269         alcSetError(device, ALC_INVALID_DEVICE);
1270         aluHandleDisconnect(device);
1271         ProcessContext(NULL);
1272         return NULL;
1273     }
1274
1275     for(i = 0;i < device->NumContexts;i++)
1276     {
1277         ALCcontext *context = device->Contexts[i];
1278         ALeffectslot *slot;
1279         ALsource *source;
1280
1281         SuspendContext(context);
1282         for(slot = context->AuxiliaryEffectSlot;slot != NULL;slot = slot->next)
1283         {
1284             if(!slot->EffectState)
1285                 continue;
1286
1287             if(ALEffect_DeviceUpdate(slot->EffectState, device) == AL_FALSE)
1288             {
1289                 alcSetError(device, ALC_INVALID_DEVICE);
1290                 aluHandleDisconnect(device);
1291                 ProcessContext(context);
1292                 ProcessContext(NULL);
1293                 ALCdevice_StopPlayback(device);
1294                 return NULL;
1295             }
1296             ALEffect_Update(slot->EffectState, context, &slot->effect);
1297         }
1298
1299         for(source = context->Source;source != NULL;source = source->next)
1300         {
1301             ALuint s = device->NumAuxSends;
1302             while(s < MAX_SENDS)
1303             {
1304                 if(source->Send[s].Slot)
1305                     source->Send[s].Slot->refcount--;
1306                 source->Send[s].Slot = NULL;
1307                 source->Send[s].WetFilter.type = 0;
1308                 source->Send[s].WetFilter.filter = 0;
1309                 s++;
1310             }
1311             source->NeedsUpdate = AL_TRUE;
1312         }
1313         aluInitPanning(context);
1314         ProcessContext(context);
1315     }
1316
1317     if(device->Bs2bLevel > 0 && device->Bs2bLevel <= 6)
1318     {
1319         if(!device->Bs2b)
1320         {
1321             device->Bs2b = calloc(1, sizeof(*device->Bs2b));
1322             bs2b_clear(device->Bs2b);
1323         }
1324         bs2b_set_srate(device->Bs2b, device->Frequency);
1325         bs2b_set_level(device->Bs2b, device->Bs2bLevel);
1326     }
1327     else
1328     {
1329         free(device->Bs2b);
1330         device->Bs2b = NULL;
1331     }
1332
1333     temp = realloc(device->Contexts, (device->NumContexts+1) * sizeof(*device->Contexts));
1334     if(!temp)
1335     {
1336         alcSetError(device, ALC_OUT_OF_MEMORY);
1337         ProcessContext(NULL);
1338         return NULL;
1339     }
1340     device->Contexts = temp;
1341
1342     ALContext = calloc(1, sizeof(ALCcontext));
1343     if(!ALContext)
1344     {
1345         alcSetError(device, ALC_OUT_OF_MEMORY);
1346         ProcessContext(NULL);
1347         return NULL;
1348     }
1349
1350     device->Contexts[device->NumContexts++] = ALContext;
1351     ALContext->Device = device;
1352
1353     InitContext(ALContext);
1354     aluInitPanning(ALContext);
1355
1356     ALContext->next = g_pContextList;
1357     g_pContextList = ALContext;
1358     g_ulContextCount++;
1359
1360     ProcessContext(NULL);
1361
1362     return ALContext;
1363 }
1364
1365
1366 /*
1367     alcDestroyContext
1368
1369     Remove a Context
1370 */
1371 ALCAPI ALCvoid ALCAPIENTRY alcDestroyContext(ALCcontext *context)
1372 {
1373     ALCcontext **list;
1374     ALuint i;
1375
1376     if (IsContext(context))
1377     {
1378         ALCdevice *Device = context->Device;
1379
1380         if(Device->NumContexts == 1)
1381             ALCdevice_StopPlayback(Device);
1382
1383         SuspendContext(NULL);
1384
1385         for(i = 0;i < Device->NumContexts-1;i++)
1386         {
1387             if(Device->Contexts[i] == context)
1388             {
1389                 memmove(&Device->Contexts[i], &Device->Contexts[i+1],
1390                         (Device->NumContexts-i-1) * sizeof(*Device->Contexts));
1391                 break;
1392             }
1393         }
1394         Device->NumContexts--;
1395
1396         // Lock context
1397         SuspendContext(context);
1398
1399         if(context->SourceCount > 0)
1400         {
1401 #ifdef _DEBUG
1402             AL_PRINT("alcDestroyContext(): deleting %d Source(s)\n", context->SourceCount);
1403 #endif
1404             ReleaseALSources(context);
1405         }
1406         if(context->AuxiliaryEffectSlotCount > 0)
1407         {
1408 #ifdef _DEBUG
1409             AL_PRINT("alcDestroyContext(): deleting %d AuxiliaryEffectSlot(s)\n", context->AuxiliaryEffectSlotCount);
1410 #endif
1411             ReleaseALAuxiliaryEffectSlots(context);
1412         }
1413
1414         list = &g_pContextList;
1415         while(*list != context)
1416             list = &(*list)->next;
1417
1418         *list = (*list)->next;
1419         g_ulContextCount--;
1420
1421         // Unlock context
1422         ProcessContext(context);
1423         ProcessContext(NULL);
1424
1425         ExitContext(context);
1426
1427         // Free memory (MUST do this after ProcessContext)
1428         memset(context, 0, sizeof(ALCcontext));
1429         free(context);
1430     }
1431     else
1432         alcSetError(NULL, ALC_INVALID_CONTEXT);
1433 }
1434
1435
1436 /*
1437     alcGetCurrentContext
1438
1439     Returns the currently active Context
1440 */
1441 ALCAPI ALCcontext * ALCAPIENTRY alcGetCurrentContext(ALCvoid)
1442 {
1443     ALCcontext *pContext;
1444
1445     if((pContext=GetContextSuspended()) != NULL)
1446         ProcessContext(pContext);
1447
1448     return pContext;
1449 }
1450
1451 /*
1452     alcGetThreadContext
1453
1454     Returns the currently active thread-local Context
1455 */
1456 ALCcontext * ALCAPIENTRY alcGetThreadContext(void)
1457 {
1458     ALCcontext *pContext = NULL;
1459
1460     SuspendContext(NULL);
1461
1462     pContext = tls_get(LocalContext);
1463     if(pContext && !IsContext(pContext))
1464     {
1465         tls_set(LocalContext, NULL);
1466         pContext = NULL;
1467     }
1468
1469     ProcessContext(NULL);
1470
1471     return pContext;
1472 }
1473
1474
1475 /*
1476     alcGetContextsDevice
1477
1478     Returns the Device that a particular Context is attached to
1479 */
1480 ALCAPI ALCdevice* ALCAPIENTRY alcGetContextsDevice(ALCcontext *pContext)
1481 {
1482     ALCdevice *pDevice = NULL;
1483
1484     SuspendContext(NULL);
1485     if (IsContext(pContext))
1486         pDevice = pContext->Device;
1487     else
1488         alcSetError(NULL, ALC_INVALID_CONTEXT);
1489     ProcessContext(NULL);
1490
1491     return pDevice;
1492 }
1493
1494
1495 /*
1496     alcMakeContextCurrent
1497
1498     Makes the given Context the active Context
1499 */
1500 ALCAPI ALCboolean ALCAPIENTRY alcMakeContextCurrent(ALCcontext *context)
1501 {
1502     ALCcontext *ALContext;
1503     ALboolean bReturn = AL_TRUE;
1504
1505     SuspendContext(NULL);
1506
1507     // context must be a valid Context or NULL
1508     if(context == NULL || IsContext(context))
1509     {
1510         ALContext = g_pContextList;
1511         while(ALContext && !ALContext->InUse)
1512             ALContext = ALContext->next;
1513
1514         if(ALContext != NULL)
1515         {
1516             SuspendContext(ALContext);
1517             ALContext->InUse=AL_FALSE;
1518             ProcessContext(ALContext);
1519         }
1520
1521         if((ALContext=context) != NULL && ALContext->Device)
1522         {
1523             SuspendContext(ALContext);
1524             ALContext->InUse=AL_TRUE;
1525             ProcessContext(ALContext);
1526         }
1527
1528         tls_set(LocalContext, NULL);
1529     }
1530     else
1531     {
1532         alcSetError(NULL, ALC_INVALID_CONTEXT);
1533         bReturn = AL_FALSE;
1534     }
1535
1536     ProcessContext(NULL);
1537
1538     return bReturn;
1539 }
1540
1541 /*
1542     alcMakeCurrent
1543
1544     Makes the given Context the active Context for the current thread
1545 */
1546 ALCboolean ALCAPIENTRY alcMakeCurrent(ALCcontext *context)
1547 {
1548     ALboolean bReturn = AL_TRUE;
1549
1550     SuspendContext(NULL);
1551
1552     // context must be a valid Context or NULL
1553     if(context == NULL || IsContext(context))
1554         tls_set(LocalContext, context);
1555     else
1556     {
1557         alcSetError(NULL, ALC_INVALID_CONTEXT);
1558         bReturn = AL_FALSE;
1559     }
1560
1561     ProcessContext(NULL);
1562
1563     return bReturn;
1564 }
1565
1566
1567 // Sets the default channel order used by most non-WaveFormatEx-based APIs
1568 void SetDefaultChannelOrder(ALCdevice *device)
1569 {
1570     switch(aluChannelsFromFormat(device->Format))
1571     {
1572     case 1: device->DevChannels[0] = FRONT_CENTER; break;
1573
1574     case 2: device->DevChannels[0] = FRONT_LEFT;
1575             device->DevChannels[1] = FRONT_RIGHT; break;
1576
1577     case 4: device->DevChannels[0] = FRONT_LEFT;
1578             device->DevChannels[1] = FRONT_RIGHT;
1579             device->DevChannels[2] = BACK_LEFT;
1580             device->DevChannels[3] = BACK_RIGHT; break;
1581
1582     case 6: device->DevChannels[0] = FRONT_LEFT;
1583             device->DevChannels[1] = FRONT_RIGHT;
1584             device->DevChannels[2] = BACK_LEFT;
1585             device->DevChannels[3] = BACK_RIGHT;
1586             device->DevChannels[4] = FRONT_CENTER;
1587             device->DevChannels[5] = LFE; break;
1588
1589     case 7: device->DevChannels[0] = FRONT_LEFT;
1590             device->DevChannels[1] = FRONT_RIGHT;
1591             device->DevChannels[2] = FRONT_CENTER;
1592             device->DevChannels[3] = LFE;
1593             device->DevChannels[4] = BACK_CENTER;
1594             device->DevChannels[5] = SIDE_LEFT;
1595             device->DevChannels[6] = SIDE_RIGHT; break;
1596
1597     case 8: device->DevChannels[0] = FRONT_LEFT;
1598             device->DevChannels[1] = FRONT_RIGHT;
1599             device->DevChannels[2] = BACK_LEFT;
1600             device->DevChannels[3] = BACK_RIGHT;
1601             device->DevChannels[4] = FRONT_CENTER;
1602             device->DevChannels[5] = LFE;
1603             device->DevChannels[6] = SIDE_LEFT;
1604             device->DevChannels[7] = SIDE_RIGHT; break;
1605     }
1606 }
1607 // Sets the default order used by WaveFormatEx
1608 void SetDefaultWFXChannelOrder(ALCdevice *device)
1609 {
1610     switch(aluChannelsFromFormat(device->Format))
1611     {
1612     case 1: device->DevChannels[0] = FRONT_CENTER; break;
1613
1614     case 2: device->DevChannels[0] = FRONT_LEFT;
1615             device->DevChannels[1] = FRONT_RIGHT; break;
1616
1617     case 4: device->DevChannels[0] = FRONT_LEFT;
1618             device->DevChannels[1] = FRONT_RIGHT;
1619             device->DevChannels[2] = BACK_LEFT;
1620             device->DevChannels[3] = BACK_RIGHT; break;
1621
1622     case 6: device->DevChannels[0] = FRONT_LEFT;
1623             device->DevChannels[1] = FRONT_RIGHT;
1624             device->DevChannels[2] = FRONT_CENTER;
1625             device->DevChannels[3] = LFE;
1626             device->DevChannels[4] = BACK_LEFT;
1627             device->DevChannels[5] = BACK_RIGHT; break;
1628
1629     case 7: device->DevChannels[0] = FRONT_LEFT;
1630             device->DevChannels[1] = FRONT_RIGHT;
1631             device->DevChannels[2] = FRONT_CENTER;
1632             device->DevChannels[3] = LFE;
1633             device->DevChannels[4] = BACK_CENTER;
1634             device->DevChannels[5] = SIDE_LEFT;
1635             device->DevChannels[6] = SIDE_RIGHT; break;
1636
1637     case 8: device->DevChannels[0] = FRONT_LEFT;
1638             device->DevChannels[1] = FRONT_RIGHT;
1639             device->DevChannels[2] = FRONT_CENTER;
1640             device->DevChannels[3] = LFE;
1641             device->DevChannels[4] = BACK_LEFT;
1642             device->DevChannels[5] = BACK_RIGHT;
1643             device->DevChannels[6] = SIDE_LEFT;
1644             device->DevChannels[7] = SIDE_RIGHT; break;
1645     }
1646 }
1647
1648 static ALenum GetFormatFromString(const char *str)
1649 {
1650     if(strcasecmp(str, "AL_FORMAT_MONO32") == 0)    return AL_FORMAT_MONO_FLOAT32;
1651     if(strcasecmp(str, "AL_FORMAT_STEREO32") == 0)  return AL_FORMAT_STEREO_FLOAT32;
1652     if(strcasecmp(str, "AL_FORMAT_QUAD32") == 0)    return AL_FORMAT_QUAD32;
1653     if(strcasecmp(str, "AL_FORMAT_51CHN32") == 0)   return AL_FORMAT_51CHN32;
1654     if(strcasecmp(str, "AL_FORMAT_61CHN32") == 0)   return AL_FORMAT_61CHN32;
1655     if(strcasecmp(str, "AL_FORMAT_71CHN32") == 0)   return AL_FORMAT_71CHN32;
1656
1657     if(strcasecmp(str, "AL_FORMAT_MONO16") == 0)    return AL_FORMAT_MONO16;
1658     if(strcasecmp(str, "AL_FORMAT_STEREO16") == 0)  return AL_FORMAT_STEREO16;
1659     if(strcasecmp(str, "AL_FORMAT_QUAD16") == 0)    return AL_FORMAT_QUAD16;
1660     if(strcasecmp(str, "AL_FORMAT_51CHN16") == 0)   return AL_FORMAT_51CHN16;
1661     if(strcasecmp(str, "AL_FORMAT_61CHN16") == 0)   return AL_FORMAT_61CHN16;
1662     if(strcasecmp(str, "AL_FORMAT_71CHN16") == 0)   return AL_FORMAT_71CHN16;
1663
1664     if(strcasecmp(str, "AL_FORMAT_MONO8") == 0)    return AL_FORMAT_MONO8;
1665     if(strcasecmp(str, "AL_FORMAT_STEREO8") == 0)  return AL_FORMAT_STEREO8;
1666     if(strcasecmp(str, "AL_FORMAT_QUAD8") == 0)    return AL_FORMAT_QUAD8;
1667     if(strcasecmp(str, "AL_FORMAT_51CHN8") == 0)   return AL_FORMAT_51CHN8;
1668     if(strcasecmp(str, "AL_FORMAT_61CHN8") == 0)   return AL_FORMAT_61CHN8;
1669     if(strcasecmp(str, "AL_FORMAT_71CHN8") == 0)   return AL_FORMAT_71CHN8;
1670
1671     AL_PRINT("Unknown format: \"%s\"\n", str);
1672     return AL_FORMAT_STEREO16;
1673 }
1674
1675 /*
1676     alcOpenDevice
1677
1678     Open the Device specified.
1679 */
1680 ALCAPI ALCdevice* ALCAPIENTRY alcOpenDevice(const ALCchar *deviceName)
1681 {
1682     ALboolean bDeviceFound = AL_FALSE;
1683     ALCdevice *device;
1684     ALint i;
1685
1686     if(deviceName && !deviceName[0])
1687         deviceName = NULL;
1688
1689     device = malloc(sizeof(ALCdevice));
1690     if (device)
1691     {
1692         const char *fmt;
1693
1694         //Initialise device structure
1695         memset(device, 0, sizeof(ALCdevice));
1696
1697         //Validate device
1698         device->Connected = ALC_TRUE;
1699         device->IsCaptureDevice = AL_FALSE;
1700         device->LastError = ALC_NO_ERROR;
1701
1702         device->Bs2b = NULL;
1703         device->szDeviceName = NULL;
1704
1705         device->Contexts = NULL;
1706         device->NumContexts = 0;
1707
1708         //Set output format
1709         device->Frequency = GetConfigValueInt(NULL, "frequency", SWMIXER_OUTPUT_RATE);
1710         if(device->Frequency < 8000)
1711             device->Frequency = 8000;
1712
1713         fmt = GetConfigValue(NULL, "format", "AL_FORMAT_STEREO16");
1714         device->Format = GetFormatFromString(fmt);
1715
1716         device->NumUpdates = GetConfigValueInt(NULL, "periods", 4);
1717         if(device->NumUpdates < 2)
1718             device->NumUpdates = 4;
1719
1720         i = GetConfigValueInt(NULL, "refresh", 4096);
1721         if(i <= 0) i = 4096;
1722
1723         device->UpdateSize = GetConfigValueInt(NULL, "period_size", i/device->NumUpdates);
1724         if(device->UpdateSize <= 0)
1725             device->UpdateSize = i/device->NumUpdates;
1726
1727         device->MaxNoOfSources = GetConfigValueInt(NULL, "sources", 256);
1728         if((ALint)device->MaxNoOfSources <= 0)
1729             device->MaxNoOfSources = 256;
1730
1731         device->AuxiliaryEffectSlotMax = GetConfigValueInt(NULL, "slots", 4);
1732         if((ALint)device->AuxiliaryEffectSlotMax <= 0)
1733             device->AuxiliaryEffectSlotMax = 4;
1734
1735         device->lNumStereoSources = 1;
1736         device->lNumMonoSources = device->MaxNoOfSources - device->lNumStereoSources;
1737
1738         device->NumAuxSends = GetConfigValueInt(NULL, "sends", MAX_SENDS);
1739         if(device->NumAuxSends > MAX_SENDS)
1740             device->NumAuxSends = MAX_SENDS;
1741
1742         device->Bs2bLevel = GetConfigValueInt(NULL, "cf_level", 0);
1743
1744         if(aluChannelsFromFormat(device->Format) <= 2)
1745         {
1746             device->HeadDampen = GetConfigValueFloat(NULL, "head_dampen", DEFAULT_HEAD_DAMPEN);
1747             device->HeadDampen = __min(device->HeadDampen, 1.0f);
1748             device->HeadDampen = __max(device->HeadDampen, 0.0f);
1749         }
1750         else
1751             device->HeadDampen = 0.0f;
1752
1753         // Find a playback device to open
1754         SuspendContext(NULL);
1755         for(i = 0;BackendList[i].Init;i++)
1756         {
1757             device->Funcs = &BackendList[i].Funcs;
1758             if(ALCdevice_OpenPlayback(device, deviceName))
1759             {
1760                 device->next = g_pDeviceList;
1761                 g_pDeviceList = device;
1762                 g_ulDeviceCount++;
1763
1764                 bDeviceFound = AL_TRUE;
1765                 break;
1766             }
1767         }
1768         ProcessContext(NULL);
1769
1770         if (!bDeviceFound)
1771         {
1772             // No suitable output device found
1773             alcSetError(NULL, ALC_INVALID_VALUE);
1774             free(device);
1775             device = NULL;
1776         }
1777     }
1778     else
1779         alcSetError(NULL, ALC_OUT_OF_MEMORY);
1780
1781     return device;
1782 }
1783
1784
1785 /*
1786     alcCloseDevice
1787
1788     Close the specified Device
1789 */
1790 ALCAPI ALCboolean ALCAPIENTRY alcCloseDevice(ALCdevice *pDevice)
1791 {
1792     ALCboolean bReturn = ALC_FALSE;
1793     ALCdevice **list;
1794
1795     if(IsDevice(pDevice) && !pDevice->IsCaptureDevice)
1796     {
1797         SuspendContext(NULL);
1798
1799         list = &g_pDeviceList;
1800         while(*list != pDevice)
1801             list = &(*list)->next;
1802
1803         *list = (*list)->next;
1804         g_ulDeviceCount--;
1805
1806         ProcessContext(NULL);
1807
1808         if(pDevice->NumContexts > 0)
1809         {
1810 #ifdef _DEBUG
1811             AL_PRINT("alcCloseDevice(): destroying %u Context(s)\n", pDevice->NumContexts);
1812 #endif
1813             while(pDevice->NumContexts > 0)
1814                 alcDestroyContext(pDevice->Contexts[0]);
1815         }
1816         ALCdevice_ClosePlayback(pDevice);
1817
1818         if(pDevice->BufferCount > 0)
1819         {
1820 #ifdef _DEBUG
1821             AL_PRINT("alcCloseDevice(): deleting %d Buffer(s)\n", pDevice->BufferCount);
1822 #endif
1823             ReleaseALBuffers(pDevice);
1824         }
1825         if(pDevice->EffectCount > 0)
1826         {
1827 #ifdef _DEBUG
1828             AL_PRINT("alcCloseDevice(): deleting %d Effect(s)\n", pDevice->EffectCount);
1829 #endif
1830             ReleaseALEffects(pDevice);
1831         }
1832         if(pDevice->FilterCount > 0)
1833         {
1834 #ifdef _DEBUG
1835             AL_PRINT("alcCloseDevice(): deleting %d Filter(s)\n", pDevice->FilterCount);
1836 #endif
1837             ReleaseALFilters(pDevice);
1838         }
1839         if(pDevice->DatabufferCount > 0)
1840         {
1841 #ifdef _DEBUG
1842             AL_PRINT("alcCloseDevice(): deleting %d Databuffer(s)\n", pDevice->DatabufferCount);
1843 #endif
1844             ReleaseALDatabuffers(pDevice);
1845         }
1846
1847         free(pDevice->Bs2b);
1848         pDevice->Bs2b = NULL;
1849
1850         free(pDevice->szDeviceName);
1851         pDevice->szDeviceName = NULL;
1852
1853         free(pDevice->Contexts);
1854         pDevice->Contexts = NULL;
1855
1856         //Release device structure
1857         memset(pDevice, 0, sizeof(ALCdevice));
1858         free(pDevice);
1859
1860         bReturn = ALC_TRUE;
1861     }
1862     else
1863         alcSetError(pDevice, ALC_INVALID_DEVICE);
1864
1865     return bReturn;
1866 }
1867
1868
1869 ALCvoid ReleaseALC(ALCvoid)
1870 {
1871     free(alcDeviceList); alcDeviceList = NULL;
1872     alcDeviceListSize = 0;
1873     free(alcAllDeviceList); alcAllDeviceList = NULL;
1874     alcAllDeviceListSize = 0;
1875     free(alcCaptureDeviceList); alcCaptureDeviceList = NULL;
1876     alcCaptureDeviceListSize = 0;
1877
1878     free(alcDefaultDeviceSpecifier);
1879     alcDefaultDeviceSpecifier = NULL;
1880     free(alcDefaultAllDeviceSpecifier);
1881     alcDefaultAllDeviceSpecifier = NULL;
1882     free(alcCaptureDefaultDeviceSpecifier);
1883     alcCaptureDefaultDeviceSpecifier = NULL;
1884
1885 #ifdef _DEBUG
1886     if(g_ulDeviceCount > 0)
1887         AL_PRINT("exit(): closing %u Device%s\n", g_ulDeviceCount, (g_ulDeviceCount>1)?"s":"");
1888 #endif
1889
1890     while(g_pDeviceList)
1891     {
1892         if(g_pDeviceList->IsCaptureDevice)
1893             alcCaptureCloseDevice(g_pDeviceList);
1894         else
1895             alcCloseDevice(g_pDeviceList);
1896     }
1897 }
1898
1899 ///////////////////////////////////////////////////////