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 size_t alcDeviceListSize;
 173 static ALCchar *alcAllDeviceList;
 174 static size_t alcAllDeviceListSize;
 175 static ALCchar *alcCaptureDeviceList;
 176 static size_t 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 alcNoDeviceExtList[] =
 184     "ALC_ENUMERATE_ALL_EXT ALC_ENUMERATION_EXT ALC_EXT_CAPTURE "
 185     "ALC_EXTX_thread_local_context";
 186 static const ALCchar alcExtensionList[] =
 187     "ALC_ENUMERATE_ALL_EXT ALC_ENUMERATION_EXT ALC_EXT_CAPTURE "
 188     "ALC_EXT_disconnect ALC_EXT_EFX ALC_EXTX_thread_local_context";
 189 static const ALCint alcMajorVersion = 1;
 190 static const ALCint alcMinorVersion = 1;
 191
 192 static const ALCint alcEFXMajorVersion = 1;
 193 static const ALCint alcEFXMinorVersion = 0;
 194
 195 ///////////////////////////////////////////////////////
 196
 197
 198 ///////////////////////////////////////////////////////
 199 // Global Variables
 200
 201 static ALCdevice *g_pDeviceList = NULL;
 202 static ALCuint    g_ulDeviceCount = 0;
 203
 204 static CRITICAL_SECTION g_csMutex;
 205
 206 // Context List
 207 static ALCcontext *g_pContextList = NULL;
 208 static ALCuint     g_ulContextCount = 0;
 209
 210 // Thread-local current context
 211 static tls_type LocalContext;
 212
 213 // Context Error
 214 static ALCenum g_eLastContextError = ALC_NO_ERROR;
 215
 216 // Default context extensions
 217 static const ALchar alExtList[] =
 218     "AL_EXTX_buffer_sub_data AL_EXT_DOUBLE AL_EXT_EXPONENT_DISTANCE "
 219     "AL_EXT_FLOAT32 AL_EXT_IMA4 AL_EXT_LINEAR_DISTANCE AL_EXT_MCFORMATS "
 220     "AL_EXT_MULAW AL_EXT_MULAW_MCFORMATS AL_EXT_OFFSET "
 221     "AL_EXTX_sample_buffer_object AL_EXT_source_distance_model "
 222     "AL_LOKI_quadriphonic";
 223
 224 // Mixing Priority Level
 225 ALint RTPrioLevel;
 226
 227 // Resampler Quality
 228 resampler_t DefaultResampler;
 229
 230 ///////////////////////////////////////////////////////
 231
 232
 233 ///////////////////////////////////////////////////////
 234 // ALC Related helper functions
 235 #ifdef _WIN32
 236 static void alc_init(void);
 237 static void alc_deinit(void);
 238
 239 BOOL APIENTRY DllMain(HANDLE hModule,DWORD ul_reason_for_call,LPVOID lpReserved)
 240 {
 241     (void)lpReserved;
 242
 243     // Perform actions based on the reason for calling.
 244     switch(ul_reason_for_call)
 245     {
 246         case DLL_PROCESS_ATTACH:
 247             DisableThreadLibraryCalls(hModule);
 248             alc_init();
 249             break;
 250
 251         case DLL_PROCESS_DETACH:
 252             alc_deinit();
 253             break;
 254     }
 255     return TRUE;
 256 }
 257 #else
 258 #ifdef HAVE_GCC_DESTRUCTOR
 259 static void alc_init(void) __attribute__((constructor));
 260 static void alc_deinit(void) __attribute__((destructor));
 261 #endif
 262 #endif
 263
 264 static void alc_init(void)
 265 {
 266     int i;
 267     const char *devs, *str;
 268
 269     InitializeCriticalSection(&g_csMutex);
 270     ALTHUNK_INIT();
 271     ReadALConfig();
 272
 273     tls_create(&LocalContext);
 274
 275     RTPrioLevel = GetConfigValueInt(NULL, "rt-prio", 0);
 276
 277     DefaultResampler = GetConfigValueInt(NULL, "resampler", RESAMPLER_DEFAULT);
 278     if(DefaultResampler >= RESAMPLER_MAX || DefaultResampler <= RESAMPLER_MIN)
 279         DefaultResampler = RESAMPLER_DEFAULT;
 280
 281     devs = GetConfigValue(NULL, "drivers", "");
 282     if(devs[0])
 283     {
 284         int n;
 285         size_t len;
 286         const char *next = devs;
 287         int endlist;
 288
 289         i = 0;
 290         do {
 291             devs = next;
 292             next = strchr(devs, ',');
 293
 294             if(!devs[0] || devs[0] == ',')
 295             {
 296                 endlist = 0;
 297                 continue;
 298             }
 299             endlist = 1;
 300
 301             len = (next ? ((size_t)(next-devs)) : strlen(devs));
 302             for(n = i;BackendList[n].Init;n++)
 303             {
 304                 if(len == strlen(BackendList[n].name) &&
 305                    strncmp(BackendList[n].name, devs, len) == 0)
 306                 {
 307                     BackendInfo Bkp = BackendList[n];
 308                     while(n > i)
 309                     {
 310                         BackendList[n] = BackendList[n-1];
 311                         --n;
 312                     }
 313                     BackendList[n] = Bkp;
 314
 315                     i++;
 316                     break;
 317                 }
 318             }
 319         } while(next++);
 320
 321         if(endlist)
 322         {
 323             BackendList[i].name = NULL;
 324             BackendList[i].Init = NULL;
 325             BackendList[i].Deinit = NULL;
 326             BackendList[i].Probe = NULL;
 327         }
 328     }
 329
 330     for(i = 0;BackendList[i].Init;i++)
 331         BackendList[i].Init(&BackendList[i].Funcs);
 332
 333     DuplicateStereo = GetConfigValueBool(NULL, "stereodup", 0);
 334
 335     str = GetConfigValue(NULL, "excludefx", "");
 336     if(str[0])
 337     {
 338         const struct {
 339             const char *name;
 340             int type;
 341         } EffectList[] = {
 342             { "eaxreverb", EAXREVERB },
 343             { "reverb", REVERB },
 344             { "echo", ECHO },
 345             { NULL, 0 }
 346         };
 347         int n;
 348         size_t len;
 349         const char *next = str;
 350
 351         do {
 352             str = next;
 353             next = strchr(str, ',');
 354
 355             if(!str[0] || next == str)
 356                 continue;
 357
 358             len = (next ? ((size_t)(next-str)) : strlen(str));
 359             for(n = 0;EffectList[n].name;n++)
 360             {
 361                 if(len == strlen(EffectList[n].name) &&
 362                    strncmp(EffectList[n].name, str, len) == 0)
 363                     DisabledEffects[EffectList[n].type] = AL_TRUE;
 364             }
 365         } while(next++);
 366     }
 367 }
 368
 369 static void alc_deinit(void)
 370 {
 371     int i;
 372
 373     ReleaseALC();
 374
 375     for(i = 0;BackendList[i].Deinit;i++)
 376         BackendList[i].Deinit();
 377
 378     tls_delete(LocalContext);
 379
 380     FreeALConfig();
 381     ALTHUNK_EXIT();
 382     DeleteCriticalSection(&g_csMutex);
 383 }
 384
 385
 386 static void ProbeDeviceList()
 387 {
 388     ALint i;
 389
 390     free(alcDeviceList); alcDeviceList = NULL;
 391     alcDeviceListSize = 0;
 392
 393     for(i = 0;BackendList[i].Probe;i++)
 394         BackendList[i].Probe(DEVICE_PROBE);
 395 }
 396
 397 static void ProbeAllDeviceList()
 398 {
 399     ALint i;
 400
 401     free(alcAllDeviceList); alcAllDeviceList = NULL;
 402     alcAllDeviceListSize = 0;
 403
 404     for(i = 0;BackendList[i].Probe;i++)
 405         BackendList[i].Probe(ALL_DEVICE_PROBE);
 406 }
 407
 408 static void ProbeCaptureDeviceList()
 409 {
 410     ALint i;
 411
 412     free(alcCaptureDeviceList); alcCaptureDeviceList = NULL;
 413     alcCaptureDeviceListSize = 0;
 414
 415     for(i = 0;BackendList[i].Probe;i++)
 416         BackendList[i].Probe(CAPTURE_DEVICE_PROBE);
 417 }
 418
 419
 420 #define DECL_APPEND_LIST_FUNC(type)                                          \
 421 void Append##type##List(const ALCchar *name)                                 \
 422 {                                                                            \
 423     size_t len = strlen(name);                                               \
 424     void *temp;                                                              \
 425                                                                              \
 426     if(len == 0)                                                             \
 427         return;                                                              \
 428                                                                              \
 429     temp = realloc(alc##type##List, alc##type##ListSize + len + 2);          \
 430     if(!temp)                                                                \
 431     {                                                                        \
 432         AL_PRINT("Realloc failed to add %s!\n", name);                       \
 433         return;                                                              \
 434     }                                                                        \
 435     alc##type##List = temp;                                                  \
 436     sprintf(alc##type##List+alc##type##ListSize, "%s", name);                \
 437     alc##type##ListSize += len+1;                                            \
 438     alc##type##List[alc##type##ListSize] = 0;                                \
 439 }
 440
 441 DECL_APPEND_LIST_FUNC(Device)
 442 DECL_APPEND_LIST_FUNC(AllDevice)
 443 DECL_APPEND_LIST_FUNC(CaptureDevice)
 444
 445
 446 void al_print(const char *fname, unsigned int line, const char *fmt, ...)
 447 {
 448     const char *fn;
 449     char str[256];
 450     int i;
 451
 452     fn = strrchr(fname, '/');
 453     if(!fn) fn = strrchr(fname, '\\');;
 454     if(!fn) fn = fname;
 455     else fn += 1;
 456
 457     i = snprintf(str, sizeof(str), "AL lib: %s:%d: ", fn, line);
 458     if(i < (int)sizeof(str) && i > 0)
 459     {
 460         va_list ap;
 461         va_start(ap, fmt);
 462         vsnprintf(str+i, sizeof(str)-i, fmt, ap);
 463         va_end(ap);
 464     }
 465     str[sizeof(str)-1] = 0;
 466
 467     fprintf(stderr, "%s", str);
 468 }
 469
 470 void EnableRTPrio(ALint level)
 471 {
 472     ALboolean failed;
 473
 474 #ifdef _WIN32
 475     if(level > 0)
 476         failed = !SetThreadPriority(GetCurrentThread(), THREAD_PRIORITY_TIME_CRITICAL);
 477     else
 478         failed = !SetThreadPriority(GetCurrentThread(), THREAD_PRIORITY_NORMAL);
 479 #elif defined(HAVE_PTHREAD_SETSCHEDPARAM)
 480     struct sched_param param;
 481
 482     if(level > 0)
 483     {
 484         /* Use the minimum real-time priority possible for now (on Linux this
 485          * should be 1 for SCHED_RR) */
 486         param.sched_priority = sched_get_priority_min(SCHED_RR);
 487         failed = !!pthread_setschedparam(pthread_self(), SCHED_RR, &param);
 488     }
 489     else
 490     {
 491         param.sched_priority = 0;
 492         failed = !!pthread_setschedparam(pthread_self(), SCHED_OTHER, &param);
 493     }
 494 #else
 495     /* Real-time priority not available */
 496     failed = !!level;
 497 #endif
 498     if(failed)
 499         AL_PRINT("Failed to set priority level for thread\n");
 500 }
 501
 502
 503 /*
 504     IsDevice
 505
 506     Check pDevice is a valid Device pointer
 507 */
 508 static ALCboolean IsDevice(ALCdevice *pDevice)
 509 {
 510     ALCdevice *pTempDevice;
 511
 512     SuspendContext(NULL);
 513
 514     pTempDevice = g_pDeviceList;
 515     while(pTempDevice && pTempDevice != pDevice)
 516         pTempDevice = pTempDevice->next;
 517
 518     ProcessContext(NULL);
 519
 520     return (pTempDevice ? ALC_TRUE : ALC_FALSE);
 521 }
 522
 523 /*
 524     IsContext
 525
 526     Check pContext is a valid Context pointer
 527 */
 528 static ALCboolean IsContext(ALCcontext *pContext)
 529 {
 530     ALCcontext *pTempContext;
 531
 532     SuspendContext(NULL);
 533
 534     pTempContext = g_pContextList;
 535     while (pTempContext && pTempContext != pContext)
 536         pTempContext = pTempContext->next;
 537
 538     ProcessContext(NULL);
 539
 540     return (pTempContext ? ALC_TRUE : ALC_FALSE);
 541 }
 542
 543
 544 /*
 545     alcSetError
 546
 547     Store latest ALC Error
 548 */
 549 ALCvoid alcSetError(ALCdevice *device, ALenum errorCode)
 550 {
 551     if(IsDevice(device))
 552         device->LastError = errorCode;
 553     else
 554         g_eLastContextError = errorCode;
 555 }
 556
 557
 558 /*
 559     SuspendContext
 560
 561     Thread-safe entry
 562 */
 563 ALCvoid SuspendContext(ALCcontext *pContext)
 564 {
 565     (void)pContext;
 566     EnterCriticalSection(&g_csMutex);
 567 }
 568
 569
 570 /*
 571     ProcessContext
 572
 573     Thread-safe exit
 574 */
 575 ALCvoid ProcessContext(ALCcontext *pContext)
 576 {
 577     (void)pContext;
 578     LeaveCriticalSection(&g_csMutex);
 579 }
 580
 581
 582 /*
 583     GetContextSuspended
 584
 585     Returns the currently active Context, in a locked state
 586 */
 587 ALCcontext *GetContextSuspended(void)
 588 {
 589     ALCcontext *pContext = NULL;
 590
 591     SuspendContext(NULL);
 592
 593     pContext = tls_get(LocalContext);
 594     if(pContext && !IsContext(pContext))
 595     {
 596         tls_set(LocalContext, NULL);
 597         pContext = NULL;
 598     }
 599     if(!pContext)
 600     {
 601         pContext = g_pContextList;
 602         while(pContext && !pContext->InUse)
 603             pContext = pContext->next;
 604     }
 605     if(pContext)
 606         SuspendContext(pContext);
 607
 608     ProcessContext(NULL);
 609
 610     return pContext;
 611 }
 612
 613
 614 /*
 615     InitContext
 616
 617     Initialize Context variables
 618 */
 619 static ALvoid InitContext(ALCcontext *pContext)
 620 {
 621     //Initialise listener
 622     pContext->Listener.Gain = 1.0f;
 623     pContext->Listener.MetersPerUnit = 1.0f;
 624     pContext->Listener.Position[0] = 0.0f;
 625     pContext->Listener.Position[1] = 0.0f;
 626     pContext->Listener.Position[2] = 0.0f;
 627     pContext->Listener.Velocity[0] = 0.0f;
 628     pContext->Listener.Velocity[1] = 0.0f;
 629     pContext->Listener.Velocity[2] = 0.0f;
 630     pContext->Listener.Forward[0] = 0.0f;
 631     pContext->Listener.Forward[1] = 0.0f;
 632     pContext->Listener.Forward[2] = -1.0f;
 633     pContext->Listener.Up[0] = 0.0f;
 634     pContext->Listener.Up[1] = 1.0f;
 635     pContext->Listener.Up[2] = 0.0f;
 636
 637     //Validate pContext
 638     pContext->LastError = AL_NO_ERROR;
 639     pContext->InUse = AL_FALSE;
 640     pContext->Suspended = AL_FALSE;
 641
 642     //Set globals
 643     pContext->DistanceModel = AL_INVERSE_DISTANCE_CLAMPED;
 644     pContext->SourceDistanceModel = AL_FALSE;
 645     pContext->DopplerFactor = 1.0f;
 646     pContext->DopplerVelocity = 1.0f;
 647     pContext->flSpeedOfSound = SPEEDOFSOUNDMETRESPERSEC;
 648
 649     pContext->ExtensionList = alExtList;
 650 }
 651
 652
 653 /*
 654     ExitContext
 655
 656     Clean up Context, destroy any remaining Sources
 657 */
 658 static ALCvoid ExitContext(ALCcontext *pContext)
 659 {
 660     //Invalidate context
 661     pContext->LastError = AL_NO_ERROR;
 662     pContext->InUse = AL_FALSE;
 663 }
 664
 665 ///////////////////////////////////////////////////////
 666
 667
 668 ///////////////////////////////////////////////////////
 669 // ALC Functions calls
 670
 671
 672 // This should probably move to another c file but for now ...
 673 ALC_API ALCdevice* ALC_APIENTRY alcCaptureOpenDevice(const ALCchar *deviceName, ALCuint frequency, ALCenum format, ALCsizei SampleSize)
 674 {
 675     ALCboolean DeviceFound = ALC_FALSE;
 676     ALCdevice *pDevice = NULL;
 677     ALCint i;
 678
 679     if(SampleSize <= 0)
 680     {
 681         alcSetError(NULL, ALC_INVALID_VALUE);
 682         return NULL;
 683     }
 684
 685     if(deviceName && !deviceName[0])
 686         deviceName = NULL;
 687
 688     pDevice = malloc(sizeof(ALCdevice));
 689     if (pDevice)
 690     {
 691         //Initialise device structure
 692         memset(pDevice, 0, sizeof(ALCdevice));
 693
 694         //Validate device
 695         pDevice->Connected = ALC_TRUE;
 696         pDevice->IsCaptureDevice = AL_TRUE;
 697
 698         pDevice->szDeviceName = NULL;
 699
 700         pDevice->Frequency = frequency;
 701         pDevice->Format = format;
 702         pDevice->UpdateSize = SampleSize;
 703         pDevice->NumUpdates = 1;
 704
 705         SuspendContext(NULL);
 706         for(i = 0;BackendList[i].Init;i++)
 707         {
 708             pDevice->Funcs = &BackendList[i].Funcs;
 709             if(ALCdevice_OpenCapture(pDevice, deviceName))
 710             {
 711                 pDevice->next = g_pDeviceList;
 712                 g_pDeviceList = pDevice;
 713                 g_ulDeviceCount++;
 714
 715                 DeviceFound = ALC_TRUE;
 716                 break;
 717             }
 718         }
 719         ProcessContext(NULL);
 720
 721         if(!DeviceFound)
 722         {
 723             alcSetError(NULL, ALC_INVALID_VALUE);
 724             free(pDevice);
 725             pDevice = NULL;
 726         }
 727     }
 728     else
 729         alcSetError(NULL, ALC_OUT_OF_MEMORY);
 730
 731     return pDevice;
 732 }
 733
 734 ALC_API ALCboolean ALC_APIENTRY alcCaptureCloseDevice(ALCdevice *pDevice)
 735 {
 736     ALCboolean bReturn = ALC_FALSE;
 737     ALCdevice **list;
 738
 739     if(IsDevice(pDevice) && pDevice->IsCaptureDevice)
 740     {
 741         SuspendContext(NULL);
 742
 743         list = &g_pDeviceList;
 744         while(*list != pDevice)
 745             list = &(*list)->next;
 746
 747         *list = (*list)->next;
 748         g_ulDeviceCount--;
 749
 750         ProcessContext(NULL);
 751
 752         ALCdevice_CloseCapture(pDevice);
 753
 754         free(pDevice->szDeviceName);
 755         pDevice->szDeviceName = NULL;
 756
 757         free(pDevice);
 758
 759         bReturn = ALC_TRUE;
 760     }
 761     else
 762         alcSetError(pDevice, ALC_INVALID_DEVICE);
 763
 764     return bReturn;
 765 }
 766
 767 ALC_API void ALC_APIENTRY alcCaptureStart(ALCdevice *pDevice)
 768 {
 769     if(IsDevice(pDevice) && pDevice->IsCaptureDevice)
 770     {
 771         SuspendContext(NULL);
 772         ALCdevice_StartCapture(pDevice);
 773         ProcessContext(NULL);
 774     }
 775     else
 776         alcSetError(pDevice, ALC_INVALID_DEVICE);
 777 }
 778
 779 ALC_API void ALC_APIENTRY alcCaptureStop(ALCdevice *pDevice)
 780 {
 781     if(IsDevice(pDevice) && pDevice->IsCaptureDevice)
 782     {
 783         SuspendContext(NULL);
 784         ALCdevice_StopCapture(pDevice);
 785         ProcessContext(NULL);
 786     }
 787     else
 788         alcSetError(pDevice, ALC_INVALID_DEVICE);
 789 }
 790
 791 ALC_API void ALC_APIENTRY alcCaptureSamples(ALCdevice *pDevice, ALCvoid *pBuffer, ALCsizei lSamples)
 792 {
 793     if(IsDevice(pDevice) && pDevice->IsCaptureDevice)
 794     {
 795         SuspendContext(NULL);
 796         ALCdevice_CaptureSamples(pDevice, pBuffer, lSamples);
 797         ProcessContext(NULL);
 798     }
 799     else
 800         alcSetError(pDevice, ALC_INVALID_DEVICE);
 801 }
 802
 803 /*
 804     alcGetError
 805
 806     Return last ALC generated error code
 807 */
 808 ALC_API ALCenum ALC_APIENTRY alcGetError(ALCdevice *device)
 809 {
 810     ALCenum errorCode = ALC_NO_ERROR;
 811
 812     if(IsDevice(device))
 813     {
 814         errorCode = device->LastError;
 815         device->LastError = ALC_NO_ERROR;
 816     }
 817     else
 818     {
 819         errorCode = g_eLastContextError;
 820         g_eLastContextError = ALC_NO_ERROR;
 821     }
 822     return errorCode;
 823 }
 824
 825
 826 /*
 827     alcSuspendContext
 828
 829     Not functional
 830 */
 831 ALC_API ALCvoid ALC_APIENTRY alcSuspendContext(ALCcontext *pContext)
 832 {
 833     SuspendContext(NULL);
 834     if(IsContext(pContext))
 835         pContext->Suspended = AL_TRUE;
 836     ProcessContext(NULL);
 837 }
 838
 839
 840 /*
 841     alcProcessContext
 842
 843     Not functional
 844 */
 845 ALC_API ALCvoid ALC_APIENTRY alcProcessContext(ALCcontext *pContext)
 846 {
 847     SuspendContext(NULL);
 848     if(IsContext(pContext))
 849         pContext->Suspended = AL_FALSE;
 850     ProcessContext(NULL);
 851 }
 852
 853
 854 /*
 855     alcGetString
 856
 857     Returns information about the Device, and error strings
 858 */
 859 ALC_API const ALCchar* ALC_APIENTRY alcGetString(ALCdevice *pDevice,ALCenum param)
 860 {
 861     const ALCchar *value = NULL;
 862
 863     switch (param)
 864     {
 865     case ALC_NO_ERROR:
 866         value = alcNoError;
 867         break;
 868
 869     case ALC_INVALID_ENUM:
 870         value = alcErrInvalidEnum;
 871         break;
 872
 873     case ALC_INVALID_VALUE:
 874         value = alcErrInvalidValue;
 875         break;
 876
 877     case ALC_INVALID_DEVICE:
 878         value = alcErrInvalidDevice;
 879         break;
 880
 881     case ALC_INVALID_CONTEXT:
 882         value = alcErrInvalidContext;
 883         break;
 884
 885     case ALC_OUT_OF_MEMORY:
 886         value = alcErrOutOfMemory;
 887         break;
 888
 889     case ALC_DEVICE_SPECIFIER:
 890         if(IsDevice(pDevice))
 891             value = pDevice->szDeviceName;
 892         else
 893         {
 894             ProbeDeviceList();
 895             value = alcDeviceList;
 896         }
 897         break;
 898
 899     case ALC_ALL_DEVICES_SPECIFIER:
 900         ProbeAllDeviceList();
 901         value = alcAllDeviceList;
 902         break;
 903
 904     case ALC_CAPTURE_DEVICE_SPECIFIER:
 905         if(IsDevice(pDevice))
 906             value = pDevice->szDeviceName;
 907         else
 908         {
 909             ProbeCaptureDeviceList();
 910             value = alcCaptureDeviceList;
 911         }
 912         break;
 913
 914     /* Default devices are always first in the list */
 915     case ALC_DEFAULT_DEVICE_SPECIFIER:
 916         if(!alcDeviceList)
 917             ProbeDeviceList();
 918
 919         free(alcDefaultDeviceSpecifier);
 920         alcDefaultDeviceSpecifier = strdup(alcDeviceList ? alcDeviceList : "");
 921         if(!alcDefaultDeviceSpecifier)
 922             alcSetError(pDevice, ALC_OUT_OF_MEMORY);
 923         value = alcDefaultDeviceSpecifier;
 924         break;
 925
 926     case ALC_DEFAULT_ALL_DEVICES_SPECIFIER:
 927         if(!alcAllDeviceList)
 928             ProbeAllDeviceList();
 929
 930         free(alcDefaultAllDeviceSpecifier);
 931         alcDefaultAllDeviceSpecifier = strdup(alcAllDeviceList ?
 932                                               alcAllDeviceList : "");
 933         if(!alcDefaultAllDeviceSpecifier)
 934             alcSetError(pDevice, ALC_OUT_OF_MEMORY);
 935         value = alcDefaultAllDeviceSpecifier;
 936         break;
 937
 938     case ALC_CAPTURE_DEFAULT_DEVICE_SPECIFIER:
 939         if(!alcCaptureDeviceList)
 940             ProbeCaptureDeviceList();
 941
 942         free(alcCaptureDefaultDeviceSpecifier);
 943         alcCaptureDefaultDeviceSpecifier = strdup(alcCaptureDeviceList ?
 944                                                   alcCaptureDeviceList : "");
 945         if(!alcCaptureDefaultDeviceSpecifier)
 946             alcSetError(pDevice, ALC_OUT_OF_MEMORY);
 947         value = alcCaptureDefaultDeviceSpecifier;
 948         break;
 949
 950     case ALC_EXTENSIONS:
 951         if(IsDevice(pDevice))
 952             value = alcExtensionList;
 953         else
 954             value = alcNoDeviceExtList;
 955         break;
 956
 957     default:
 958         alcSetError(pDevice, ALC_INVALID_ENUM);
 959         break;
 960     }
 961
 962     return value;
 963 }
 964
 965
 966 /*
 967     alcGetIntegerv
 968
 969     Returns information about the Device and the version of Open AL
 970 */
 971 ALC_API ALCvoid ALC_APIENTRY alcGetIntegerv(ALCdevice *device,ALCenum param,ALsizei size,ALCint *data)
 972 {
 973     if(size == 0 || data == NULL)
 974     {
 975         alcSetError(device, ALC_INVALID_VALUE);
 976         return;
 977     }
 978
 979     if(IsDevice(device) && device->IsCaptureDevice)
 980     {
 981         SuspendContext(NULL);
 982
 983         // Capture device
 984         switch (param)
 985         {
 986         case ALC_CAPTURE_SAMPLES:
 987             *data = ALCdevice_AvailableSamples(device);
 988             break;
 989
 990         case ALC_CONNECTED:
 991             *data = device->Connected;
 992             break;
 993
 994         default:
 995             alcSetError(device, ALC_INVALID_ENUM);
 996             break;
 997         }
 998
 999         ProcessContext(NULL);
1000         return;
1001     }
1002
1003     // Playback Device
1004     switch (param)
1005     {
1006         case ALC_MAJOR_VERSION:
1007             *data = alcMajorVersion;
1008             break;
1009
1010         case ALC_MINOR_VERSION:
1011             *data = alcMinorVersion;
1012             break;
1013
1014         case ALC_EFX_MAJOR_VERSION:
1015             *data = alcEFXMajorVersion;
1016             break;
1017
1018         case ALC_EFX_MINOR_VERSION:
1019             *data = alcEFXMinorVersion;
1020             break;
1021
1022         case ALC_MAX_AUXILIARY_SENDS:
1023             if(!IsDevice(device))
1024                 alcSetError(device, ALC_INVALID_DEVICE);
1025             else
1026                 *data = device->NumAuxSends;
1027             break;
1028
1029         case ALC_ATTRIBUTES_SIZE:
1030             if(!IsDevice(device))
1031                 alcSetError(device, ALC_INVALID_DEVICE);
1032             else
1033                 *data = 13;
1034             break;
1035
1036         case ALC_ALL_ATTRIBUTES:
1037             if(!IsDevice(device))
1038                 alcSetError(device, ALC_INVALID_DEVICE);
1039             else if (size < 13)
1040                 alcSetError(device, ALC_INVALID_VALUE);
1041             else
1042             {
1043                 int i = 0;
1044
1045                 SuspendContext(NULL);
1046                 data[i++] = ALC_FREQUENCY;
1047                 data[i++] = device->Frequency;
1048
1049                 data[i++] = ALC_REFRESH;
1050                 data[i++] = device->Frequency / device->UpdateSize;
1051
1052                 data[i++] = ALC_SYNC;
1053                 data[i++] = ALC_FALSE;
1054
1055                 data[i++] = ALC_MONO_SOURCES;
1056                 data[i++] = device->lNumMonoSources;
1057
1058                 data[i++] = ALC_STEREO_SOURCES;
1059                 data[i++] = device->lNumStereoSources;
1060
1061                 data[i++] = ALC_MAX_AUXILIARY_SENDS;
1062                 data[i++] = device->NumAuxSends;
1063
1064                 data[i++] = 0;
1065                 ProcessContext(NULL);
1066             }
1067             break;
1068
1069         case ALC_FREQUENCY:
1070             if(!IsDevice(device))
1071                 alcSetError(device, ALC_INVALID_DEVICE);
1072             else
1073                 *data = device->Frequency;
1074             break;
1075
1076         case ALC_REFRESH:
1077             if(!IsDevice(device))
1078                 alcSetError(device, ALC_INVALID_DEVICE);
1079             else
1080                 *data = device->Frequency / device->UpdateSize;
1081             break;
1082
1083         case ALC_SYNC:
1084             if(!IsDevice(device))
1085                 alcSetError(device, ALC_INVALID_DEVICE);
1086             else
1087                 *data = ALC_FALSE;
1088             break;
1089
1090         case ALC_MONO_SOURCES:
1091             if(!IsDevice(device))
1092                 alcSetError(device, ALC_INVALID_DEVICE);
1093             else
1094                 *data = device->lNumMonoSources;
1095             break;
1096
1097         case ALC_STEREO_SOURCES:
1098             if(!IsDevice(device))
1099                 alcSetError(device, ALC_INVALID_DEVICE);
1100             else
1101                 *data = device->lNumStereoSources;
1102             break;
1103
1104         case ALC_CONNECTED:
1105             if(!IsDevice(device))
1106                 alcSetError(device, ALC_INVALID_DEVICE);
1107             else
1108                 *data = device->Connected;
1109             break;
1110
1111         default:
1112             alcSetError(device, ALC_INVALID_ENUM);
1113             break;
1114     }
1115 }
1116
1117
1118 /*
1119     alcIsExtensionPresent
1120
1121     Determines if there is support for a particular extension
1122 */
1123 ALC_API ALCboolean ALC_APIENTRY alcIsExtensionPresent(ALCdevice *device, const ALCchar *extName)
1124 {
1125     ALCboolean bResult = ALC_FALSE;
1126
1127     if (extName)
1128     {
1129         const char *ptr;
1130         size_t len;
1131
1132         len = strlen(extName);
1133         ptr = (IsDevice(device) ? alcExtensionList : alcNoDeviceExtList);
1134         while(ptr && *ptr)
1135         {
1136             if(strncasecmp(ptr, extName, len) == 0 &&
1137                (ptr[len] == '\0' || isspace(ptr[len])))
1138             {
1139                 bResult = ALC_TRUE;
1140                 break;
1141             }
1142             if((ptr=strchr(ptr, ' ')) != NULL)
1143             {
1144                 do {
1145                     ++ptr;
1146                 } while(isspace(*ptr));
1147             }
1148         }
1149     }
1150     else
1151         alcSetError(device, ALC_INVALID_VALUE);
1152
1153     return bResult;
1154 }
1155
1156
1157 /*
1158     alcGetProcAddress
1159
1160     Retrieves the function address for a particular extension function
1161 */
1162 ALC_API ALCvoid* ALC_APIENTRY alcGetProcAddress(ALCdevice *device, const ALCchar *funcName)
1163 {
1164     ALCvoid *pFunction = NULL;
1165     ALsizei i = 0;
1166
1167     if (funcName)
1168     {
1169         while(alcFunctions[i].funcName &&
1170               strcmp(alcFunctions[i].funcName,funcName) != 0)
1171             i++;
1172         pFunction = alcFunctions[i].address;
1173     }
1174     else
1175         alcSetError(device, ALC_INVALID_VALUE);
1176
1177     return pFunction;
1178 }
1179
1180
1181 /*
1182     alcGetEnumValue
1183
1184     Get the value for a particular ALC Enumerated Value
1185 */
1186 ALC_API ALCenum ALC_APIENTRY alcGetEnumValue(ALCdevice *device, const ALCchar *enumName)
1187 {
1188     ALsizei i = 0;
1189     ALCenum val;
1190
1191     while ((enumeration[i].enumName)&&(strcmp(enumeration[i].enumName,enumName)))
1192         i++;
1193     val = enumeration[i].value;
1194
1195     if(!enumeration[i].enumName)
1196         alcSetError(device, ALC_INVALID_VALUE);
1197
1198     return val;
1199 }
1200
1201
1202 /*
1203     alcCreateContext
1204
1205     Create and attach a Context to a particular Device.
1206 */
1207 ALC_API ALCcontext* ALC_APIENTRY alcCreateContext(ALCdevice *device, const ALCint *attrList)
1208 {
1209     ALuint attrIdx, reqStereoSources;
1210     ALCcontext *ALContext;
1211     void *temp;
1212     ALuint i;
1213
1214     SuspendContext(NULL);
1215
1216     if(!IsDevice(device) || device->IsCaptureDevice || !device->Connected)
1217     {
1218         alcSetError(device, ALC_INVALID_DEVICE);
1219         ProcessContext(NULL);
1220         return NULL;
1221     }
1222
1223     // Reset Context Last Error code
1224     device->LastError = ALC_NO_ERROR;
1225
1226     // If a context is already running on the device, stop playback so the
1227     // device attributes can be updated
1228     if(device->NumContexts > 0)
1229     {
1230         ProcessContext(NULL);
1231         ALCdevice_StopPlayback(device);
1232         SuspendContext(NULL);
1233     }
1234
1235     // Check for attributes
1236     if(attrList)
1237     {
1238         ALCint level = device->Bs2bLevel;
1239         ALCuint freq = device->Frequency;
1240         ALCint numMono = device->lNumMonoSources;
1241         ALCint numStereo = device->lNumStereoSources;
1242         ALCuint numSends = device->NumAuxSends;
1243
1244         attrIdx = 0;
1245         while(attrList[attrIdx])
1246         {
1247             if(attrList[attrIdx] == ALC_FREQUENCY &&
1248                !ConfigValueExists(NULL, "frequency"))
1249             {
1250                 freq = attrList[attrIdx + 1];
1251                 if(freq < 8000)
1252                     freq = 8000;
1253             }
1254
1255             if(attrList[attrIdx] == ALC_STEREO_SOURCES)
1256             {
1257                 reqStereoSources = attrList[attrIdx + 1];
1258                 if(reqStereoSources > device->MaxNoOfSources)
1259                     reqStereoSources = device->MaxNoOfSources;
1260
1261                 numStereo = reqStereoSources;
1262                 numMono = device->MaxNoOfSources - numStereo;
1263             }
1264
1265             if(attrList[attrIdx] == ALC_MAX_AUXILIARY_SENDS &&
1266                !ConfigValueExists(NULL, "sends"))
1267             {
1268                 numSends = attrList[attrIdx + 1];
1269                 if(numSends > MAX_SENDS)
1270                     numSends = MAX_SENDS;
1271             }
1272
1273             attrIdx += 2;
1274         }
1275
1276         device->UpdateSize = (ALuint64)device->UpdateSize * freq /
1277                              device->Frequency;
1278
1279         device->Bs2bLevel = level;
1280         device->Frequency = freq;
1281         device->lNumMonoSources = numMono;
1282         device->lNumStereoSources = numStereo;
1283         device->NumAuxSends = numSends;
1284     }
1285
1286     if(ALCdevice_ResetPlayback(device) == ALC_FALSE)
1287     {
1288         alcSetError(device, ALC_INVALID_DEVICE);
1289         aluHandleDisconnect(device);
1290         ProcessContext(NULL);
1291         return NULL;
1292     }
1293
1294     for(i = 0;i < device->NumContexts;i++)
1295     {
1296         ALCcontext *context = device->Contexts[i];
1297         ALeffectslot *slot;
1298         ALsource *source;
1299
1300         SuspendContext(context);
1301         for(slot = context->EffectSlotList;slot != NULL;slot = slot->next)
1302         {
1303             if(!slot->EffectState)
1304                 continue;
1305
1306             if(ALEffect_DeviceUpdate(slot->EffectState, device) == AL_FALSE)
1307             {
1308                 alcSetError(device, ALC_INVALID_DEVICE);
1309                 aluHandleDisconnect(device);
1310                 ProcessContext(context);
1311                 ProcessContext(NULL);
1312                 ALCdevice_StopPlayback(device);
1313                 return NULL;
1314             }
1315             ALEffect_Update(slot->EffectState, context, &slot->effect);
1316         }
1317
1318         for(source = context->SourceList;source != NULL;source = source->next)
1319         {
1320             ALuint s = device->NumAuxSends;
1321             while(s < MAX_SENDS)
1322             {
1323                 if(source->Send[s].Slot)
1324                     source->Send[s].Slot->refcount--;
1325                 source->Send[s].Slot = NULL;
1326                 source->Send[s].WetFilter.type = 0;
1327                 source->Send[s].WetFilter.filter = 0;
1328                 s++;
1329             }
1330             source->NeedsUpdate = AL_TRUE;
1331         }
1332         aluInitPanning(context);
1333         ProcessContext(context);
1334     }
1335
1336     if(device->Bs2bLevel > 0 && device->Bs2bLevel <= 6)
1337     {
1338         if(!device->Bs2b)
1339         {
1340             device->Bs2b = calloc(1, sizeof(*device->Bs2b));
1341             bs2b_clear(device->Bs2b);
1342         }
1343         bs2b_set_srate(device->Bs2b, device->Frequency);
1344         bs2b_set_level(device->Bs2b, device->Bs2bLevel);
1345     }
1346     else
1347     {
1348         free(device->Bs2b);
1349         device->Bs2b = NULL;
1350     }
1351
1352     temp = realloc(device->Contexts, (device->NumContexts+1) * sizeof(*device->Contexts));
1353     if(!temp)
1354     {
1355         alcSetError(device, ALC_OUT_OF_MEMORY);
1356         ProcessContext(NULL);
1357         return NULL;
1358     }
1359     device->Contexts = temp;
1360
1361     ALContext = calloc(1, sizeof(ALCcontext));
1362     if(!ALContext)
1363     {
1364         alcSetError(device, ALC_OUT_OF_MEMORY);
1365         ProcessContext(NULL);
1366         return NULL;
1367     }
1368
1369     device->Contexts[device->NumContexts++] = ALContext;
1370     ALContext->Device = device;
1371
1372     InitContext(ALContext);
1373     aluInitPanning(ALContext);
1374
1375     ALContext->next = g_pContextList;
1376     g_pContextList = ALContext;
1377     g_ulContextCount++;
1378
1379     ProcessContext(NULL);
1380
1381     return ALContext;
1382 }
1383
1384
1385 /*
1386     alcDestroyContext
1387
1388     Remove a Context
1389 */
1390 ALC_API ALCvoid ALC_APIENTRY alcDestroyContext(ALCcontext *context)
1391 {
1392     ALCcontext **list;
1393     ALuint i;
1394
1395     if (IsContext(context))
1396     {
1397         ALCdevice *Device = context->Device;
1398
1399         if(Device->NumContexts == 1)
1400             ALCdevice_StopPlayback(Device);
1401
1402         SuspendContext(NULL);
1403
1404         for(i = 0;i < Device->NumContexts-1;i++)
1405         {
1406             if(Device->Contexts[i] == context)
1407             {
1408                 memmove(&Device->Contexts[i], &Device->Contexts[i+1],
1409                         (Device->NumContexts-i-1) * sizeof(*Device->Contexts));
1410                 break;
1411             }
1412         }
1413         Device->NumContexts--;
1414
1415         // Lock context
1416         SuspendContext(context);
1417
1418         if(context->SourceCount > 0)
1419         {
1420 #ifdef _DEBUG
1421             AL_PRINT("alcDestroyContext(): deleting %d Source(s)\n", context->SourceCount);
1422 #endif
1423             ReleaseALSources(context);
1424         }
1425         if(context->EffectSlotCount > 0)
1426         {
1427 #ifdef _DEBUG
1428             AL_PRINT("alcDestroyContext(): deleting %d AuxiliaryEffectSlot(s)\n", context->EffectSlotCount);
1429 #endif
1430             ReleaseALAuxiliaryEffectSlots(context);
1431         }
1432
1433         list = &g_pContextList;
1434         while(*list != context)
1435             list = &(*list)->next;
1436
1437         *list = (*list)->next;
1438         g_ulContextCount--;
1439
1440         // Unlock context
1441         ProcessContext(context);
1442         ProcessContext(NULL);
1443
1444         ExitContext(context);
1445
1446         // Free memory (MUST do this after ProcessContext)
1447         memset(context, 0, sizeof(ALCcontext));
1448         free(context);
1449     }
1450     else
1451         alcSetError(NULL, ALC_INVALID_CONTEXT);
1452 }
1453
1454
1455 /*
1456     alcGetCurrentContext
1457
1458     Returns the currently active Context
1459 */
1460 ALC_API ALCcontext* ALC_APIENTRY alcGetCurrentContext(ALCvoid)
1461 {
1462     ALCcontext *pContext;
1463
1464     if((pContext=GetContextSuspended()) != NULL)
1465         ProcessContext(pContext);
1466
1467     return pContext;
1468 }
1469
1470 /*
1471     alcGetThreadContext
1472
1473     Returns the currently active thread-local Context
1474 */
1475 ALCcontext* ALC_APIENTRY alcGetThreadContext(void)
1476 {
1477     ALCcontext *pContext = NULL;
1478
1479     SuspendContext(NULL);
1480
1481     pContext = tls_get(LocalContext);
1482     if(pContext && !IsContext(pContext))
1483     {
1484         tls_set(LocalContext, NULL);
1485         pContext = NULL;
1486     }
1487
1488     ProcessContext(NULL);
1489
1490     return pContext;
1491 }
1492
1493
1494 /*
1495     alcGetContextsDevice
1496
1497     Returns the Device that a particular Context is attached to
1498 */
1499 ALC_API ALCdevice* ALC_APIENTRY alcGetContextsDevice(ALCcontext *pContext)
1500 {
1501     ALCdevice *pDevice = NULL;
1502
1503     SuspendContext(NULL);
1504     if (IsContext(pContext))
1505         pDevice = pContext->Device;
1506     else
1507         alcSetError(NULL, ALC_INVALID_CONTEXT);
1508     ProcessContext(NULL);
1509
1510     return pDevice;
1511 }
1512
1513
1514 /*
1515     alcMakeContextCurrent
1516
1517     Makes the given Context the active Context
1518 */
1519 ALC_API ALCboolean ALC_APIENTRY alcMakeContextCurrent(ALCcontext *context)
1520 {
1521     ALCcontext *ALContext;
1522     ALboolean bReturn = AL_TRUE;
1523
1524     SuspendContext(NULL);
1525
1526     // context must be a valid Context or NULL
1527     if(context == NULL || IsContext(context))
1528     {
1529         ALContext = g_pContextList;
1530         while(ALContext && !ALContext->InUse)
1531             ALContext = ALContext->next;
1532
1533         if(ALContext != NULL)
1534         {
1535             SuspendContext(ALContext);
1536             ALContext->InUse=AL_FALSE;
1537             ProcessContext(ALContext);
1538         }
1539
1540         if((ALContext=context) != NULL && ALContext->Device)
1541         {
1542             SuspendContext(ALContext);
1543             ALContext->InUse=AL_TRUE;
1544             ProcessContext(ALContext);
1545         }
1546
1547         tls_set(LocalContext, NULL);
1548     }
1549     else
1550     {
1551         alcSetError(NULL, ALC_INVALID_CONTEXT);
1552         bReturn = AL_FALSE;
1553     }
1554
1555     ProcessContext(NULL);
1556
1557     return bReturn;
1558 }
1559
1560 /*
1561     alcMakeCurrent
1562
1563     Makes the given Context the active Context for the current thread
1564 */
1565 ALCboolean ALC_APIENTRY alcMakeCurrent(ALCcontext *context)
1566 {
1567     ALboolean bReturn = AL_TRUE;
1568
1569     SuspendContext(NULL);
1570
1571     // context must be a valid Context or NULL
1572     if(context == NULL || IsContext(context))
1573         tls_set(LocalContext, context);
1574     else
1575     {
1576         alcSetError(NULL, ALC_INVALID_CONTEXT);
1577         bReturn = AL_FALSE;
1578     }
1579
1580     ProcessContext(NULL);
1581
1582     return bReturn;
1583 }
1584
1585
1586 // Sets the default channel order used by most non-WaveFormatEx-based APIs
1587 void SetDefaultChannelOrder(ALCdevice *device)
1588 {
1589     switch(aluChannelsFromFormat(device->Format))
1590     {
1591     case 1: device->DevChannels[0] = FRONT_CENTER; break;
1592
1593     case 2: device->DevChannels[0] = FRONT_LEFT;
1594             device->DevChannels[1] = FRONT_RIGHT; break;
1595
1596     case 4: device->DevChannels[0] = FRONT_LEFT;
1597             device->DevChannels[1] = FRONT_RIGHT;
1598             device->DevChannels[2] = BACK_LEFT;
1599             device->DevChannels[3] = BACK_RIGHT; break;
1600
1601     case 6: device->DevChannels[0] = FRONT_LEFT;
1602             device->DevChannels[1] = FRONT_RIGHT;
1603             device->DevChannels[2] = BACK_LEFT;
1604             device->DevChannels[3] = BACK_RIGHT;
1605             device->DevChannels[4] = FRONT_CENTER;
1606             device->DevChannels[5] = LFE; break;
1607
1608     case 7: device->DevChannels[0] = FRONT_LEFT;
1609             device->DevChannels[1] = FRONT_RIGHT;
1610             device->DevChannels[2] = FRONT_CENTER;
1611             device->DevChannels[3] = LFE;
1612             device->DevChannels[4] = BACK_CENTER;
1613             device->DevChannels[5] = SIDE_LEFT;
1614             device->DevChannels[6] = SIDE_RIGHT; break;
1615
1616     case 8: device->DevChannels[0] = FRONT_LEFT;
1617             device->DevChannels[1] = FRONT_RIGHT;
1618             device->DevChannels[2] = BACK_LEFT;
1619             device->DevChannels[3] = BACK_RIGHT;
1620             device->DevChannels[4] = FRONT_CENTER;
1621             device->DevChannels[5] = LFE;
1622             device->DevChannels[6] = SIDE_LEFT;
1623             device->DevChannels[7] = SIDE_RIGHT; break;
1624     }
1625 }
1626 // Sets the default order used by WaveFormatEx
1627 void SetDefaultWFXChannelOrder(ALCdevice *device)
1628 {
1629     switch(aluChannelsFromFormat(device->Format))
1630     {
1631     case 1: device->DevChannels[0] = FRONT_CENTER; break;
1632
1633     case 2: device->DevChannels[0] = FRONT_LEFT;
1634             device->DevChannels[1] = FRONT_RIGHT; break;
1635
1636     case 4: device->DevChannels[0] = FRONT_LEFT;
1637             device->DevChannels[1] = FRONT_RIGHT;
1638             device->DevChannels[2] = BACK_LEFT;
1639             device->DevChannels[3] = BACK_RIGHT; break;
1640
1641     case 6: device->DevChannels[0] = FRONT_LEFT;
1642             device->DevChannels[1] = FRONT_RIGHT;
1643             device->DevChannels[2] = FRONT_CENTER;
1644             device->DevChannels[3] = LFE;
1645             device->DevChannels[4] = BACK_LEFT;
1646             device->DevChannels[5] = BACK_RIGHT; break;
1647
1648     case 7: device->DevChannels[0] = FRONT_LEFT;
1649             device->DevChannels[1] = FRONT_RIGHT;
1650             device->DevChannels[2] = FRONT_CENTER;
1651             device->DevChannels[3] = LFE;
1652             device->DevChannels[4] = BACK_CENTER;
1653             device->DevChannels[5] = SIDE_LEFT;
1654             device->DevChannels[6] = SIDE_RIGHT; break;
1655
1656     case 8: device->DevChannels[0] = FRONT_LEFT;
1657             device->DevChannels[1] = FRONT_RIGHT;
1658             device->DevChannels[2] = FRONT_CENTER;
1659             device->DevChannels[3] = LFE;
1660             device->DevChannels[4] = BACK_LEFT;
1661             device->DevChannels[5] = BACK_RIGHT;
1662             device->DevChannels[6] = SIDE_LEFT;
1663             device->DevChannels[7] = SIDE_RIGHT; break;
1664     }
1665 }
1666
1667 static ALenum GetFormatFromString(const char *str)
1668 {
1669     if(strcasecmp(str, "AL_FORMAT_MONO32") == 0)    return AL_FORMAT_MONO_FLOAT32;
1670     if(strcasecmp(str, "AL_FORMAT_STEREO32") == 0)  return AL_FORMAT_STEREO_FLOAT32;
1671     if(strcasecmp(str, "AL_FORMAT_QUAD32") == 0)    return AL_FORMAT_QUAD32;
1672     if(strcasecmp(str, "AL_FORMAT_51CHN32") == 0)   return AL_FORMAT_51CHN32;
1673     if(strcasecmp(str, "AL_FORMAT_61CHN32") == 0)   return AL_FORMAT_61CHN32;
1674     if(strcasecmp(str, "AL_FORMAT_71CHN32") == 0)   return AL_FORMAT_71CHN32;
1675
1676     if(strcasecmp(str, "AL_FORMAT_MONO16") == 0)    return AL_FORMAT_MONO16;
1677     if(strcasecmp(str, "AL_FORMAT_STEREO16") == 0)  return AL_FORMAT_STEREO16;
1678     if(strcasecmp(str, "AL_FORMAT_QUAD16") == 0)    return AL_FORMAT_QUAD16;
1679     if(strcasecmp(str, "AL_FORMAT_51CHN16") == 0)   return AL_FORMAT_51CHN16;
1680     if(strcasecmp(str, "AL_FORMAT_61CHN16") == 0)   return AL_FORMAT_61CHN16;
1681     if(strcasecmp(str, "AL_FORMAT_71CHN16") == 0)   return AL_FORMAT_71CHN16;
1682
1683     if(strcasecmp(str, "AL_FORMAT_MONO8") == 0)    return AL_FORMAT_MONO8;
1684     if(strcasecmp(str, "AL_FORMAT_STEREO8") == 0)  return AL_FORMAT_STEREO8;
1685     if(strcasecmp(str, "AL_FORMAT_QUAD8") == 0)    return AL_FORMAT_QUAD8;
1686     if(strcasecmp(str, "AL_FORMAT_51CHN8") == 0)   return AL_FORMAT_51CHN8;
1687     if(strcasecmp(str, "AL_FORMAT_61CHN8") == 0)   return AL_FORMAT_61CHN8;
1688     if(strcasecmp(str, "AL_FORMAT_71CHN8") == 0)   return AL_FORMAT_71CHN8;
1689
1690     AL_PRINT("Unknown format: \"%s\"\n", str);
1691     return AL_FORMAT_STEREO16;
1692 }
1693
1694 /*
1695     alcOpenDevice
1696
1697     Open the Device specified.
1698 */
1699 ALC_API ALCdevice* ALC_APIENTRY alcOpenDevice(const ALCchar *deviceName)
1700 {
1701     ALboolean bDeviceFound = AL_FALSE;
1702     ALCdevice *device;
1703     ALint i;
1704
1705     if(deviceName && !deviceName[0])
1706         deviceName = NULL;
1707
1708     device = malloc(sizeof(ALCdevice));
1709     if (device)
1710     {
1711         const char *fmt;
1712
1713         //Initialise device structure
1714         memset(device, 0, sizeof(ALCdevice));
1715
1716         //Validate device
1717         device->Connected = ALC_TRUE;
1718         device->IsCaptureDevice = AL_FALSE;
1719         device->LastError = ALC_NO_ERROR;
1720
1721         device->Bs2b = NULL;
1722         device->szDeviceName = NULL;
1723
1724         device->Contexts = NULL;
1725         device->NumContexts = 0;
1726
1727         //Set output format
1728         device->Frequency = GetConfigValueInt(NULL, "frequency", SWMIXER_OUTPUT_RATE);
1729         if(device->Frequency < 8000)
1730             device->Frequency = 8000;
1731
1732         fmt = GetConfigValue(NULL, "format", "AL_FORMAT_STEREO16");
1733         device->Format = GetFormatFromString(fmt);
1734
1735         device->NumUpdates = GetConfigValueInt(NULL, "periods", 4);
1736         if(device->NumUpdates < 2)
1737             device->NumUpdates = 4;
1738
1739         i = GetConfigValueInt(NULL, "refresh", 4096);
1740         if(i <= 0) i = 4096;
1741
1742         device->UpdateSize = GetConfigValueInt(NULL, "period_size", i/device->NumUpdates);
1743         if(device->UpdateSize <= 0)
1744             device->UpdateSize = i/device->NumUpdates;
1745
1746         device->MaxNoOfSources = GetConfigValueInt(NULL, "sources", 256);
1747         if((ALint)device->MaxNoOfSources <= 0)
1748             device->MaxNoOfSources = 256;
1749
1750         device->AuxiliaryEffectSlotMax = GetConfigValueInt(NULL, "slots", 4);
1751         if((ALint)device->AuxiliaryEffectSlotMax <= 0)
1752             device->AuxiliaryEffectSlotMax = 4;
1753
1754         device->lNumStereoSources = 1;
1755         device->lNumMonoSources = device->MaxNoOfSources - device->lNumStereoSources;
1756
1757         device->NumAuxSends = GetConfigValueInt(NULL, "sends", MAX_SENDS);
1758         if(device->NumAuxSends > MAX_SENDS)
1759             device->NumAuxSends = MAX_SENDS;
1760
1761         device->Bs2bLevel = GetConfigValueInt(NULL, "cf_level", 0);
1762
1763         if(aluChannelsFromFormat(device->Format) <= 2)
1764         {
1765             device->HeadDampen = GetConfigValueFloat(NULL, "head_dampen", DEFAULT_HEAD_DAMPEN);
1766             device->HeadDampen = __min(device->HeadDampen, 1.0f);
1767             device->HeadDampen = __max(device->HeadDampen, 0.0f);
1768         }
1769         else
1770             device->HeadDampen = 0.0f;
1771
1772         // Find a playback device to open
1773         SuspendContext(NULL);
1774         for(i = 0;BackendList[i].Init;i++)
1775         {
1776             device->Funcs = &BackendList[i].Funcs;
1777             if(ALCdevice_OpenPlayback(device, deviceName))
1778             {
1779                 device->next = g_pDeviceList;
1780                 g_pDeviceList = device;
1781                 g_ulDeviceCount++;
1782
1783                 bDeviceFound = AL_TRUE;
1784                 break;
1785             }
1786         }
1787         ProcessContext(NULL);
1788
1789         if (!bDeviceFound)
1790         {
1791             // No suitable output device found
1792             alcSetError(NULL, ALC_INVALID_VALUE);
1793             free(device);
1794             device = NULL;
1795         }
1796     }
1797     else
1798         alcSetError(NULL, ALC_OUT_OF_MEMORY);
1799
1800     return device;
1801 }
1802
1803
1804 /*
1805     alcCloseDevice
1806
1807     Close the specified Device
1808 */
1809 ALC_API ALCboolean ALC_APIENTRY alcCloseDevice(ALCdevice *pDevice)
1810 {
1811     ALCboolean bReturn = ALC_FALSE;
1812     ALCdevice **list;
1813
1814     if(IsDevice(pDevice) && !pDevice->IsCaptureDevice)
1815     {
1816         SuspendContext(NULL);
1817
1818         list = &g_pDeviceList;
1819         while(*list != pDevice)
1820             list = &(*list)->next;
1821
1822         *list = (*list)->next;
1823         g_ulDeviceCount--;
1824
1825         ProcessContext(NULL);
1826
1827         if(pDevice->NumContexts > 0)
1828         {
1829 #ifdef _DEBUG
1830             AL_PRINT("alcCloseDevice(): destroying %u Context(s)\n", pDevice->NumContexts);
1831 #endif
1832             while(pDevice->NumContexts > 0)
1833                 alcDestroyContext(pDevice->Contexts[0]);
1834         }
1835         ALCdevice_ClosePlayback(pDevice);
1836
1837         if(pDevice->BufferCount > 0)
1838         {
1839 #ifdef _DEBUG
1840             AL_PRINT("alcCloseDevice(): deleting %d Buffer(s)\n", pDevice->BufferCount);
1841 #endif
1842             ReleaseALBuffers(pDevice);
1843         }
1844         if(pDevice->EffectCount > 0)
1845         {
1846 #ifdef _DEBUG
1847             AL_PRINT("alcCloseDevice(): deleting %d Effect(s)\n", pDevice->EffectCount);
1848 #endif
1849             ReleaseALEffects(pDevice);
1850         }
1851         if(pDevice->FilterCount > 0)
1852         {
1853 #ifdef _DEBUG
1854             AL_PRINT("alcCloseDevice(): deleting %d Filter(s)\n", pDevice->FilterCount);
1855 #endif
1856             ReleaseALFilters(pDevice);
1857         }
1858         if(pDevice->DatabufferCount > 0)
1859         {
1860 #ifdef _DEBUG
1861             AL_PRINT("alcCloseDevice(): deleting %d Databuffer(s)\n", pDevice->DatabufferCount);
1862 #endif
1863             ReleaseALDatabuffers(pDevice);
1864         }
1865
1866         free(pDevice->Bs2b);
1867         pDevice->Bs2b = NULL;
1868
1869         free(pDevice->szDeviceName);
1870         pDevice->szDeviceName = NULL;
1871
1872         free(pDevice->Contexts);
1873         pDevice->Contexts = NULL;
1874
1875         //Release device structure
1876         memset(pDevice, 0, sizeof(ALCdevice));
1877         free(pDevice);
1878
1879         bReturn = ALC_TRUE;
1880     }
1881     else
1882         alcSetError(pDevice, ALC_INVALID_DEVICE);
1883
1884     return bReturn;
1885 }
1886
1887
1888 ALCvoid ReleaseALC(ALCvoid)
1889 {
1890     free(alcDeviceList); alcDeviceList = NULL;
1891     alcDeviceListSize = 0;
1892     free(alcAllDeviceList); alcAllDeviceList = NULL;
1893     alcAllDeviceListSize = 0;
1894     free(alcCaptureDeviceList); alcCaptureDeviceList = NULL;
1895     alcCaptureDeviceListSize = 0;
1896
1897     free(alcDefaultDeviceSpecifier);
1898     alcDefaultDeviceSpecifier = NULL;
1899     free(alcDefaultAllDeviceSpecifier);
1900     alcDefaultAllDeviceSpecifier = NULL;
1901     free(alcCaptureDefaultDeviceSpecifier);
1902     alcCaptureDefaultDeviceSpecifier = NULL;
1903
1904 #ifdef _DEBUG
1905     if(g_ulDeviceCount > 0)
1906         AL_PRINT("exit(): closing %u Device%s\n", g_ulDeviceCount, (g_ulDeviceCount>1)?"s":"");
1907 #endif
1908
1909     while(g_pDeviceList)
1910     {
1911         if(g_pDeviceList->IsCaptureDevice)
1912             alcCaptureCloseDevice(g_pDeviceList);
1913         else
1914             alcCloseDevice(g_pDeviceList);
1915     }
1916 }
1917
1918 ///////////////////////////////////////////////////////