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     {
 767         SuspendContext(NULL);
 768         ALCdevice_StartCapture(pDevice);
 769         ProcessContext(NULL);
 770     }
 771     else
 772         alcSetError(pDevice, ALC_INVALID_DEVICE);
 773 }
 774
 775 ALCAPI void ALCAPIENTRY alcCaptureStop(ALCdevice *pDevice)
 776 {
 777     if(IsDevice(pDevice) && pDevice->IsCaptureDevice)
 778     {
 779         SuspendContext(NULL);
 780         ALCdevice_StopCapture(pDevice);
 781         ProcessContext(NULL);
 782     }
 783     else
 784         alcSetError(pDevice, ALC_INVALID_DEVICE);
 785 }
 786
 787 ALCAPI void ALCAPIENTRY alcCaptureSamples(ALCdevice *pDevice, ALCvoid *pBuffer, ALCsizei lSamples)
 788 {
 789     if(IsDevice(pDevice) && pDevice->IsCaptureDevice)
 790     {
 791         SuspendContext(NULL);
 792         ALCdevice_CaptureSamples(pDevice, pBuffer, lSamples);
 793         ProcessContext(NULL);
 794     }
 795     else
 796         alcSetError(pDevice, ALC_INVALID_DEVICE);
 797 }
 798
 799 /*
 800     alcGetError
 801
 802     Return last ALC generated error code
 803 */
 804 ALCAPI ALCenum ALCAPIENTRY alcGetError(ALCdevice *device)
 805 {
 806     ALCenum errorCode = ALC_NO_ERROR;
 807
 808     if(IsDevice(device))
 809     {
 810         errorCode = device->LastError;
 811         device->LastError = ALC_NO_ERROR;
 812     }
 813     else
 814     {
 815         errorCode = g_eLastContextError;
 816         g_eLastContextError = ALC_NO_ERROR;
 817     }
 818     return errorCode;
 819 }
 820
 821
 822 /*
 823     alcSuspendContext
 824
 825     Not functional
 826 */
 827 ALCAPI ALCvoid ALCAPIENTRY alcSuspendContext(ALCcontext *pContext)
 828 {
 829     SuspendContext(NULL);
 830     if(IsContext(pContext))
 831         pContext->Suspended = AL_TRUE;
 832     ProcessContext(NULL);
 833 }
 834
 835
 836 /*
 837     alcProcessContext
 838
 839     Not functional
 840 */
 841 ALCAPI ALCvoid ALCAPIENTRY alcProcessContext(ALCcontext *pContext)
 842 {
 843     SuspendContext(NULL);
 844     if(IsContext(pContext))
 845         pContext->Suspended = AL_FALSE;
 846     ProcessContext(NULL);
 847 }
 848
 849
 850 /*
 851     alcGetString
 852
 853     Returns information about the Device, and error strings
 854 */
 855 ALCAPI const ALCchar* ALCAPIENTRY alcGetString(ALCdevice *pDevice,ALCenum param)
 856 {
 857     const ALCchar *value = NULL;
 858
 859     switch (param)
 860     {
 861     case ALC_NO_ERROR:
 862         value = alcNoError;
 863         break;
 864
 865     case ALC_INVALID_ENUM:
 866         value = alcErrInvalidEnum;
 867         break;
 868
 869     case ALC_INVALID_VALUE:
 870         value = alcErrInvalidValue;
 871         break;
 872
 873     case ALC_INVALID_DEVICE:
 874         value = alcErrInvalidDevice;
 875         break;
 876
 877     case ALC_INVALID_CONTEXT:
 878         value = alcErrInvalidContext;
 879         break;
 880
 881     case ALC_OUT_OF_MEMORY:
 882         value = alcErrOutOfMemory;
 883         break;
 884
 885     case ALC_DEVICE_SPECIFIER:
 886         if(IsDevice(pDevice))
 887             value = pDevice->szDeviceName;
 888         else
 889         {
 890             ProbeDeviceList();
 891             value = alcDeviceList;
 892         }
 893         break;
 894
 895     case ALC_ALL_DEVICES_SPECIFIER:
 896         ProbeAllDeviceList();
 897         value = alcAllDeviceList;
 898         break;
 899
 900     case ALC_CAPTURE_DEVICE_SPECIFIER:
 901         if(IsDevice(pDevice))
 902             value = pDevice->szDeviceName;
 903         else
 904         {
 905             ProbeCaptureDeviceList();
 906             value = alcCaptureDeviceList;
 907         }
 908         break;
 909
 910     /* Default devices are always first in the list */
 911     case ALC_DEFAULT_DEVICE_SPECIFIER:
 912         if(!alcDeviceList)
 913             ProbeDeviceList();
 914
 915         free(alcDefaultDeviceSpecifier);
 916         alcDefaultDeviceSpecifier = strdup(alcDeviceList ? alcDeviceList : "");
 917         if(!alcDefaultDeviceSpecifier)
 918             alcSetError(pDevice, ALC_OUT_OF_MEMORY);
 919         value = alcDefaultDeviceSpecifier;
 920         break;
 921
 922     case ALC_DEFAULT_ALL_DEVICES_SPECIFIER:
 923         if(!alcAllDeviceList)
 924             ProbeAllDeviceList();
 925
 926         free(alcDefaultAllDeviceSpecifier);
 927         alcDefaultAllDeviceSpecifier = strdup(alcAllDeviceList ?
 928                                               alcAllDeviceList : "");
 929         if(!alcDefaultAllDeviceSpecifier)
 930             alcSetError(pDevice, ALC_OUT_OF_MEMORY);
 931         value = alcDefaultAllDeviceSpecifier;
 932         break;
 933
 934     case ALC_CAPTURE_DEFAULT_DEVICE_SPECIFIER:
 935         if(!alcCaptureDeviceList)
 936             ProbeCaptureDeviceList();
 937
 938         free(alcCaptureDefaultDeviceSpecifier);
 939         alcCaptureDefaultDeviceSpecifier = strdup(alcCaptureDeviceList ?
 940                                                   alcCaptureDeviceList : "");
 941         if(!alcCaptureDefaultDeviceSpecifier)
 942             alcSetError(pDevice, ALC_OUT_OF_MEMORY);
 943         value = alcCaptureDefaultDeviceSpecifier;
 944         break;
 945
 946     case ALC_EXTENSIONS:
 947         value = alcExtensionList;
 948         break;
 949
 950     default:
 951         alcSetError(pDevice, ALC_INVALID_ENUM);
 952         break;
 953     }
 954
 955     return value;
 956 }
 957
 958
 959 /*
 960     alcGetIntegerv
 961
 962     Returns information about the Device and the version of Open AL
 963 */
 964 ALCAPI ALCvoid ALCAPIENTRY alcGetIntegerv(ALCdevice *device,ALCenum param,ALsizei size,ALCint *data)
 965 {
 966     if(size == 0 || data == NULL)
 967     {
 968         alcSetError(device, ALC_INVALID_VALUE);
 969         return;
 970     }
 971
 972     if(IsDevice(device) && device->IsCaptureDevice)
 973     {
 974         SuspendContext(NULL);
 975
 976         // Capture device
 977         switch (param)
 978         {
 979         case ALC_CAPTURE_SAMPLES:
 980             *data = ALCdevice_AvailableSamples(device);
 981             break;
 982
 983         case ALC_CONNECTED:
 984             *data = device->Connected;
 985             break;
 986
 987         default:
 988             alcSetError(device, ALC_INVALID_ENUM);
 989             break;
 990         }
 991
 992         ProcessContext(NULL);
 993         return;
 994     }
 995
 996     // Playback Device
 997     switch (param)
 998     {
 999         case ALC_MAJOR_VERSION:
1000             *data = alcMajorVersion;
1001             break;
1002
1003         case ALC_MINOR_VERSION:
1004             *data = alcMinorVersion;
1005             break;
1006
1007         case ALC_EFX_MAJOR_VERSION:
1008             *data = alcEFXMajorVersion;
1009             break;
1010
1011         case ALC_EFX_MINOR_VERSION:
1012             *data = alcEFXMinorVersion;
1013             break;
1014
1015         case ALC_MAX_AUXILIARY_SENDS:
1016             if(!IsDevice(device))
1017                 alcSetError(device, ALC_INVALID_DEVICE);
1018             else
1019                 *data = device->NumAuxSends;
1020             break;
1021
1022         case ALC_ATTRIBUTES_SIZE:
1023             if(!IsDevice(device))
1024                 alcSetError(device, ALC_INVALID_DEVICE);
1025             else
1026                 *data = 13;
1027             break;
1028
1029         case ALC_ALL_ATTRIBUTES:
1030             if(!IsDevice(device))
1031                 alcSetError(device, ALC_INVALID_DEVICE);
1032             else if (size < 13)
1033                 alcSetError(device, ALC_INVALID_VALUE);
1034             else
1035             {
1036                 int i = 0;
1037
1038                 SuspendContext(NULL);
1039                 data[i++] = ALC_FREQUENCY;
1040                 data[i++] = device->Frequency;
1041
1042                 data[i++] = ALC_REFRESH;
1043                 data[i++] = device->Frequency / device->UpdateSize;
1044
1045                 data[i++] = ALC_SYNC;
1046                 data[i++] = ALC_FALSE;
1047
1048                 data[i++] = ALC_MONO_SOURCES;
1049                 data[i++] = device->lNumMonoSources;
1050
1051                 data[i++] = ALC_STEREO_SOURCES;
1052                 data[i++] = device->lNumStereoSources;
1053
1054                 data[i++] = ALC_MAX_AUXILIARY_SENDS;
1055                 data[i++] = device->NumAuxSends;
1056
1057                 data[i++] = 0;
1058                 ProcessContext(NULL);
1059             }
1060             break;
1061
1062         case ALC_FREQUENCY:
1063             if(!IsDevice(device))
1064                 alcSetError(device, ALC_INVALID_DEVICE);
1065             else
1066                 *data = device->Frequency;
1067             break;
1068
1069         case ALC_REFRESH:
1070             if(!IsDevice(device))
1071                 alcSetError(device, ALC_INVALID_DEVICE);
1072             else
1073                 *data = device->Frequency / device->UpdateSize;
1074             break;
1075
1076         case ALC_SYNC:
1077             if(!IsDevice(device))
1078                 alcSetError(device, ALC_INVALID_DEVICE);
1079             else
1080                 *data = ALC_FALSE;
1081             break;
1082
1083         case ALC_MONO_SOURCES:
1084             if(!IsDevice(device))
1085                 alcSetError(device, ALC_INVALID_DEVICE);
1086             else
1087                 *data = device->lNumMonoSources;
1088             break;
1089
1090         case ALC_STEREO_SOURCES:
1091             if(!IsDevice(device))
1092                 alcSetError(device, ALC_INVALID_DEVICE);
1093             else
1094                 *data = device->lNumStereoSources;
1095             break;
1096
1097         case ALC_CONNECTED:
1098             if(!IsDevice(device))
1099                 alcSetError(device, ALC_INVALID_DEVICE);
1100             else
1101                 *data = device->Connected;
1102             break;
1103
1104         default:
1105             alcSetError(device, ALC_INVALID_ENUM);
1106             break;
1107     }
1108 }
1109
1110
1111 /*
1112     alcIsExtensionPresent
1113
1114     Determines if there is support for a particular extension
1115 */
1116 ALCAPI ALCboolean ALCAPIENTRY alcIsExtensionPresent(ALCdevice *device, const ALCchar *extName)
1117 {
1118     ALCboolean bResult = ALC_FALSE;
1119
1120     if (extName)
1121     {
1122         const char *ptr;
1123         size_t len;
1124
1125         len = strlen(extName);
1126         ptr = alcExtensionList;
1127         while(ptr && *ptr)
1128         {
1129             if(strncasecmp(ptr, extName, len) == 0 &&
1130                (ptr[len] == '\0' || isspace(ptr[len])))
1131             {
1132                 bResult = ALC_TRUE;
1133                 break;
1134             }
1135             if((ptr=strchr(ptr, ' ')) != NULL)
1136             {
1137                 do {
1138                     ++ptr;
1139                 } while(isspace(*ptr));
1140             }
1141         }
1142     }
1143     else
1144         alcSetError(device, ALC_INVALID_VALUE);
1145
1146     return bResult;
1147 }
1148
1149
1150 /*
1151     alcGetProcAddress
1152
1153     Retrieves the function address for a particular extension function
1154 */
1155 ALCAPI ALCvoid *  ALCAPIENTRY alcGetProcAddress(ALCdevice *device, const ALCchar *funcName)
1156 {
1157     ALCvoid *pFunction = NULL;
1158     ALsizei i = 0;
1159
1160     if (funcName)
1161     {
1162         while(alcFunctions[i].funcName &&
1163               strcmp(alcFunctions[i].funcName,funcName) != 0)
1164             i++;
1165         pFunction = alcFunctions[i].address;
1166     }
1167     else
1168         alcSetError(device, ALC_INVALID_VALUE);
1169
1170     return pFunction;
1171 }
1172
1173
1174 /*
1175     alcGetEnumValue
1176
1177     Get the value for a particular ALC Enumerated Value
1178 */
1179 ALCAPI ALCenum ALCAPIENTRY alcGetEnumValue(ALCdevice *device, const ALCchar *enumName)
1180 {
1181     ALsizei i = 0;
1182     ALCenum val;
1183
1184     while ((enumeration[i].enumName)&&(strcmp(enumeration[i].enumName,enumName)))
1185         i++;
1186     val = enumeration[i].value;
1187
1188     if(!enumeration[i].enumName)
1189         alcSetError(device, ALC_INVALID_VALUE);
1190
1191     return val;
1192 }
1193
1194
1195 /*
1196     alcCreateContext
1197
1198     Create and attach a Context to a particular Device.
1199 */
1200 ALCAPI ALCcontext* ALCAPIENTRY alcCreateContext(ALCdevice *device, const ALCint *attrList)
1201 {
1202     ALuint attrIdx, reqStereoSources;
1203     ALCcontext *ALContext;
1204     void *temp;
1205     ALuint i;
1206
1207     SuspendContext(NULL);
1208
1209     if(!IsDevice(device) || device->IsCaptureDevice || !device->Connected)
1210     {
1211         alcSetError(device, ALC_INVALID_DEVICE);
1212         ProcessContext(NULL);
1213         return NULL;
1214     }
1215
1216     // Reset Context Last Error code
1217     device->LastError = ALC_NO_ERROR;
1218
1219     // If a context is already running on the device, stop playback so the
1220     // device attributes can be updated
1221     if(device->NumContexts > 0)
1222     {
1223         ProcessContext(NULL);
1224         ALCdevice_StopPlayback(device);
1225         SuspendContext(NULL);
1226     }
1227
1228     // Check for attributes
1229     if(attrList)
1230     {
1231         ALCint level = device->Bs2bLevel;
1232         ALCuint freq = device->Frequency;
1233         ALCint numMono = device->lNumMonoSources;
1234         ALCint numStereo = device->lNumStereoSources;
1235         ALCuint numSends = device->NumAuxSends;
1236
1237         attrIdx = 0;
1238         while(attrList[attrIdx])
1239         {
1240             if(attrList[attrIdx] == ALC_FREQUENCY &&
1241                !ConfigValueExists(NULL, "frequency"))
1242             {
1243                 freq = attrList[attrIdx + 1];
1244                 if(freq < 8000)
1245                     freq = 8000;
1246             }
1247
1248             if(attrList[attrIdx] == ALC_STEREO_SOURCES)
1249             {
1250                 reqStereoSources = attrList[attrIdx + 1];
1251                 if(reqStereoSources > device->MaxNoOfSources)
1252                     reqStereoSources = device->MaxNoOfSources;
1253
1254                 numStereo = reqStereoSources;
1255                 numMono = device->MaxNoOfSources - numStereo;
1256             }
1257
1258             if(attrList[attrIdx] == ALC_MAX_AUXILIARY_SENDS &&
1259                !ConfigValueExists(NULL, "sends"))
1260             {
1261                 numSends = attrList[attrIdx + 1];
1262                 if(numSends > MAX_SENDS)
1263                     numSends = MAX_SENDS;
1264             }
1265
1266             attrIdx += 2;
1267         }
1268
1269         device->UpdateSize = (ALuint64)device->UpdateSize * freq /
1270                              device->Frequency;
1271
1272         device->Bs2bLevel = level;
1273         device->Frequency = freq;
1274         device->lNumMonoSources = numMono;
1275         device->lNumStereoSources = numStereo;
1276         device->NumAuxSends = numSends;
1277     }
1278
1279     if(ALCdevice_ResetPlayback(device) == ALC_FALSE)
1280     {
1281         alcSetError(device, ALC_INVALID_DEVICE);
1282         aluHandleDisconnect(device);
1283         ProcessContext(NULL);
1284         return NULL;
1285     }
1286
1287     for(i = 0;i < device->NumContexts;i++)
1288     {
1289         ALCcontext *context = device->Contexts[i];
1290         ALeffectslot *slot;
1291         ALsource *source;
1292
1293         SuspendContext(context);
1294         for(slot = context->AuxiliaryEffectSlot;slot != NULL;slot = slot->next)
1295         {
1296             if(!slot->EffectState)
1297                 continue;
1298
1299             if(ALEffect_DeviceUpdate(slot->EffectState, device) == AL_FALSE)
1300             {
1301                 alcSetError(device, ALC_INVALID_DEVICE);
1302                 aluHandleDisconnect(device);
1303                 ProcessContext(context);
1304                 ProcessContext(NULL);
1305                 ALCdevice_StopPlayback(device);
1306                 return NULL;
1307             }
1308             ALEffect_Update(slot->EffectState, context, &slot->effect);
1309         }
1310
1311         for(source = context->Source;source != NULL;source = source->next)
1312         {
1313             ALuint s = device->NumAuxSends;
1314             while(s < MAX_SENDS)
1315             {
1316                 if(source->Send[s].Slot)
1317                     source->Send[s].Slot->refcount--;
1318                 source->Send[s].Slot = NULL;
1319                 source->Send[s].WetFilter.type = 0;
1320                 source->Send[s].WetFilter.filter = 0;
1321                 s++;
1322             }
1323             source->NeedsUpdate = AL_TRUE;
1324         }
1325         aluInitPanning(context);
1326         ProcessContext(context);
1327     }
1328
1329     if(device->Bs2bLevel > 0 && device->Bs2bLevel <= 6)
1330     {
1331         if(!device->Bs2b)
1332         {
1333             device->Bs2b = calloc(1, sizeof(*device->Bs2b));
1334             bs2b_clear(device->Bs2b);
1335         }
1336         bs2b_set_srate(device->Bs2b, device->Frequency);
1337         bs2b_set_level(device->Bs2b, device->Bs2bLevel);
1338     }
1339     else
1340     {
1341         free(device->Bs2b);
1342         device->Bs2b = NULL;
1343     }
1344
1345     temp = realloc(device->Contexts, (device->NumContexts+1) * sizeof(*device->Contexts));
1346     if(!temp)
1347     {
1348         alcSetError(device, ALC_OUT_OF_MEMORY);
1349         ProcessContext(NULL);
1350         return NULL;
1351     }
1352     device->Contexts = temp;
1353
1354     ALContext = calloc(1, sizeof(ALCcontext));
1355     if(!ALContext)
1356     {
1357         alcSetError(device, ALC_OUT_OF_MEMORY);
1358         ProcessContext(NULL);
1359         return NULL;
1360     }
1361
1362     device->Contexts[device->NumContexts++] = ALContext;
1363     ALContext->Device = device;
1364
1365     InitContext(ALContext);
1366     aluInitPanning(ALContext);
1367
1368     ALContext->next = g_pContextList;
1369     g_pContextList = ALContext;
1370     g_ulContextCount++;
1371
1372     ProcessContext(NULL);
1373
1374     return ALContext;
1375 }
1376
1377
1378 /*
1379     alcDestroyContext
1380
1381     Remove a Context
1382 */
1383 ALCAPI ALCvoid ALCAPIENTRY alcDestroyContext(ALCcontext *context)
1384 {
1385     ALCcontext **list;
1386     ALuint i;
1387
1388     if (IsContext(context))
1389     {
1390         ALCdevice *Device = context->Device;
1391
1392         if(Device->NumContexts == 1)
1393             ALCdevice_StopPlayback(Device);
1394
1395         SuspendContext(NULL);
1396
1397         for(i = 0;i < Device->NumContexts-1;i++)
1398         {
1399             if(Device->Contexts[i] == context)
1400             {
1401                 memmove(&Device->Contexts[i], &Device->Contexts[i+1],
1402                         (Device->NumContexts-i-1) * sizeof(*Device->Contexts));
1403                 break;
1404             }
1405         }
1406         Device->NumContexts--;
1407
1408         // Lock context
1409         SuspendContext(context);
1410
1411         if(context->SourceCount > 0)
1412         {
1413 #ifdef _DEBUG
1414             AL_PRINT("alcDestroyContext(): deleting %d Source(s)\n", context->SourceCount);
1415 #endif
1416             ReleaseALSources(context);
1417         }
1418         if(context->AuxiliaryEffectSlotCount > 0)
1419         {
1420 #ifdef _DEBUG
1421             AL_PRINT("alcDestroyContext(): deleting %d AuxiliaryEffectSlot(s)\n", context->AuxiliaryEffectSlotCount);
1422 #endif
1423             ReleaseALAuxiliaryEffectSlots(context);
1424         }
1425
1426         list = &g_pContextList;
1427         while(*list != context)
1428             list = &(*list)->next;
1429
1430         *list = (*list)->next;
1431         g_ulContextCount--;
1432
1433         // Unlock context
1434         ProcessContext(context);
1435         ProcessContext(NULL);
1436
1437         ExitContext(context);
1438
1439         // Free memory (MUST do this after ProcessContext)
1440         memset(context, 0, sizeof(ALCcontext));
1441         free(context);
1442     }
1443     else
1444         alcSetError(NULL, ALC_INVALID_CONTEXT);
1445 }
1446
1447
1448 /*
1449     alcGetCurrentContext
1450
1451     Returns the currently active Context
1452 */
1453 ALCAPI ALCcontext * ALCAPIENTRY alcGetCurrentContext(ALCvoid)
1454 {
1455     ALCcontext *pContext;
1456
1457     if((pContext=GetContextSuspended()) != NULL)
1458         ProcessContext(pContext);
1459
1460     return pContext;
1461 }
1462
1463 /*
1464     alcGetThreadContext
1465
1466     Returns the currently active thread-local Context
1467 */
1468 ALCcontext * ALCAPIENTRY alcGetThreadContext(void)
1469 {
1470     ALCcontext *pContext = NULL;
1471
1472     SuspendContext(NULL);
1473
1474     pContext = tls_get(LocalContext);
1475     if(pContext && !IsContext(pContext))
1476     {
1477         tls_set(LocalContext, NULL);
1478         pContext = NULL;
1479     }
1480
1481     ProcessContext(NULL);
1482
1483     return pContext;
1484 }
1485
1486
1487 /*
1488     alcGetContextsDevice
1489
1490     Returns the Device that a particular Context is attached to
1491 */
1492 ALCAPI ALCdevice* ALCAPIENTRY alcGetContextsDevice(ALCcontext *pContext)
1493 {
1494     ALCdevice *pDevice = NULL;
1495
1496     SuspendContext(NULL);
1497     if (IsContext(pContext))
1498         pDevice = pContext->Device;
1499     else
1500         alcSetError(NULL, ALC_INVALID_CONTEXT);
1501     ProcessContext(NULL);
1502
1503     return pDevice;
1504 }
1505
1506
1507 /*
1508     alcMakeContextCurrent
1509
1510     Makes the given Context the active Context
1511 */
1512 ALCAPI ALCboolean ALCAPIENTRY alcMakeContextCurrent(ALCcontext *context)
1513 {
1514     ALCcontext *ALContext;
1515     ALboolean bReturn = AL_TRUE;
1516
1517     SuspendContext(NULL);
1518
1519     // context must be a valid Context or NULL
1520     if(context == NULL || IsContext(context))
1521     {
1522         ALContext = g_pContextList;
1523         while(ALContext && !ALContext->InUse)
1524             ALContext = ALContext->next;
1525
1526         if(ALContext != NULL)
1527         {
1528             SuspendContext(ALContext);
1529             ALContext->InUse=AL_FALSE;
1530             ProcessContext(ALContext);
1531         }
1532
1533         if((ALContext=context) != NULL && ALContext->Device)
1534         {
1535             SuspendContext(ALContext);
1536             ALContext->InUse=AL_TRUE;
1537             ProcessContext(ALContext);
1538         }
1539
1540         tls_set(LocalContext, NULL);
1541     }
1542     else
1543     {
1544         alcSetError(NULL, ALC_INVALID_CONTEXT);
1545         bReturn = AL_FALSE;
1546     }
1547
1548     ProcessContext(NULL);
1549
1550     return bReturn;
1551 }
1552
1553 /*
1554     alcMakeCurrent
1555
1556     Makes the given Context the active Context for the current thread
1557 */
1558 ALCboolean ALCAPIENTRY alcMakeCurrent(ALCcontext *context)
1559 {
1560     ALboolean bReturn = AL_TRUE;
1561
1562     SuspendContext(NULL);
1563
1564     // context must be a valid Context or NULL
1565     if(context == NULL || IsContext(context))
1566         tls_set(LocalContext, context);
1567     else
1568     {
1569         alcSetError(NULL, ALC_INVALID_CONTEXT);
1570         bReturn = AL_FALSE;
1571     }
1572
1573     ProcessContext(NULL);
1574
1575     return bReturn;
1576 }
1577
1578
1579 // Sets the default channel order used by most non-WaveFormatEx-based APIs
1580 void SetDefaultChannelOrder(ALCdevice *device)
1581 {
1582     switch(aluChannelsFromFormat(device->Format))
1583     {
1584     case 1: device->DevChannels[0] = FRONT_CENTER; break;
1585
1586     case 2: device->DevChannels[0] = FRONT_LEFT;
1587             device->DevChannels[1] = FRONT_RIGHT; break;
1588
1589     case 4: device->DevChannels[0] = FRONT_LEFT;
1590             device->DevChannels[1] = FRONT_RIGHT;
1591             device->DevChannels[2] = BACK_LEFT;
1592             device->DevChannels[3] = BACK_RIGHT; break;
1593
1594     case 6: device->DevChannels[0] = FRONT_LEFT;
1595             device->DevChannels[1] = FRONT_RIGHT;
1596             device->DevChannels[2] = BACK_LEFT;
1597             device->DevChannels[3] = BACK_RIGHT;
1598             device->DevChannels[4] = FRONT_CENTER;
1599             device->DevChannels[5] = LFE; break;
1600
1601     case 7: device->DevChannels[0] = FRONT_LEFT;
1602             device->DevChannels[1] = FRONT_RIGHT;
1603             device->DevChannels[2] = FRONT_CENTER;
1604             device->DevChannels[3] = LFE;
1605             device->DevChannels[4] = BACK_CENTER;
1606             device->DevChannels[5] = SIDE_LEFT;
1607             device->DevChannels[6] = SIDE_RIGHT; break;
1608
1609     case 8: device->DevChannels[0] = FRONT_LEFT;
1610             device->DevChannels[1] = FRONT_RIGHT;
1611             device->DevChannels[2] = BACK_LEFT;
1612             device->DevChannels[3] = BACK_RIGHT;
1613             device->DevChannels[4] = FRONT_CENTER;
1614             device->DevChannels[5] = LFE;
1615             device->DevChannels[6] = SIDE_LEFT;
1616             device->DevChannels[7] = SIDE_RIGHT; break;
1617     }
1618 }
1619 // Sets the default order used by WaveFormatEx
1620 void SetDefaultWFXChannelOrder(ALCdevice *device)
1621 {
1622     switch(aluChannelsFromFormat(device->Format))
1623     {
1624     case 1: device->DevChannels[0] = FRONT_CENTER; break;
1625
1626     case 2: device->DevChannels[0] = FRONT_LEFT;
1627             device->DevChannels[1] = FRONT_RIGHT; break;
1628
1629     case 4: device->DevChannels[0] = FRONT_LEFT;
1630             device->DevChannels[1] = FRONT_RIGHT;
1631             device->DevChannels[2] = BACK_LEFT;
1632             device->DevChannels[3] = BACK_RIGHT; break;
1633
1634     case 6: device->DevChannels[0] = FRONT_LEFT;
1635             device->DevChannels[1] = FRONT_RIGHT;
1636             device->DevChannels[2] = FRONT_CENTER;
1637             device->DevChannels[3] = LFE;
1638             device->DevChannels[4] = BACK_LEFT;
1639             device->DevChannels[5] = BACK_RIGHT; break;
1640
1641     case 7: 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_CENTER;
1646             device->DevChannels[5] = SIDE_LEFT;
1647             device->DevChannels[6] = SIDE_RIGHT; break;
1648
1649     case 8: device->DevChannels[0] = FRONT_LEFT;
1650             device->DevChannels[1] = FRONT_RIGHT;
1651             device->DevChannels[2] = FRONT_CENTER;
1652             device->DevChannels[3] = LFE;
1653             device->DevChannels[4] = BACK_LEFT;
1654             device->DevChannels[5] = BACK_RIGHT;
1655             device->DevChannels[6] = SIDE_LEFT;
1656             device->DevChannels[7] = SIDE_RIGHT; break;
1657     }
1658 }
1659
1660 static ALenum GetFormatFromString(const char *str)
1661 {
1662     if(strcasecmp(str, "AL_FORMAT_MONO32") == 0)    return AL_FORMAT_MONO_FLOAT32;
1663     if(strcasecmp(str, "AL_FORMAT_STEREO32") == 0)  return AL_FORMAT_STEREO_FLOAT32;
1664     if(strcasecmp(str, "AL_FORMAT_QUAD32") == 0)    return AL_FORMAT_QUAD32;
1665     if(strcasecmp(str, "AL_FORMAT_51CHN32") == 0)   return AL_FORMAT_51CHN32;
1666     if(strcasecmp(str, "AL_FORMAT_61CHN32") == 0)   return AL_FORMAT_61CHN32;
1667     if(strcasecmp(str, "AL_FORMAT_71CHN32") == 0)   return AL_FORMAT_71CHN32;
1668
1669     if(strcasecmp(str, "AL_FORMAT_MONO16") == 0)    return AL_FORMAT_MONO16;
1670     if(strcasecmp(str, "AL_FORMAT_STEREO16") == 0)  return AL_FORMAT_STEREO16;
1671     if(strcasecmp(str, "AL_FORMAT_QUAD16") == 0)    return AL_FORMAT_QUAD16;
1672     if(strcasecmp(str, "AL_FORMAT_51CHN16") == 0)   return AL_FORMAT_51CHN16;
1673     if(strcasecmp(str, "AL_FORMAT_61CHN16") == 0)   return AL_FORMAT_61CHN16;
1674     if(strcasecmp(str, "AL_FORMAT_71CHN16") == 0)   return AL_FORMAT_71CHN16;
1675
1676     if(strcasecmp(str, "AL_FORMAT_MONO8") == 0)    return AL_FORMAT_MONO8;
1677     if(strcasecmp(str, "AL_FORMAT_STEREO8") == 0)  return AL_FORMAT_STEREO8;
1678     if(strcasecmp(str, "AL_FORMAT_QUAD8") == 0)    return AL_FORMAT_QUAD8;
1679     if(strcasecmp(str, "AL_FORMAT_51CHN8") == 0)   return AL_FORMAT_51CHN8;
1680     if(strcasecmp(str, "AL_FORMAT_61CHN8") == 0)   return AL_FORMAT_61CHN8;
1681     if(strcasecmp(str, "AL_FORMAT_71CHN8") == 0)   return AL_FORMAT_71CHN8;
1682
1683     AL_PRINT("Unknown format: \"%s\"\n", str);
1684     return AL_FORMAT_STEREO16;
1685 }
1686
1687 /*
1688     alcOpenDevice
1689
1690     Open the Device specified.
1691 */
1692 ALCAPI ALCdevice* ALCAPIENTRY alcOpenDevice(const ALCchar *deviceName)
1693 {
1694     ALboolean bDeviceFound = AL_FALSE;
1695     ALCdevice *device;
1696     ALint i;
1697
1698     if(deviceName && !deviceName[0])
1699         deviceName = NULL;
1700
1701     device = malloc(sizeof(ALCdevice));
1702     if (device)
1703     {
1704         const char *fmt;
1705
1706         //Initialise device structure
1707         memset(device, 0, sizeof(ALCdevice));
1708
1709         //Validate device
1710         device->Connected = ALC_TRUE;
1711         device->IsCaptureDevice = AL_FALSE;
1712         device->LastError = ALC_NO_ERROR;
1713
1714         device->Bs2b = NULL;
1715         device->szDeviceName = NULL;
1716
1717         device->Contexts = NULL;
1718         device->NumContexts = 0;
1719
1720         //Set output format
1721         device->Frequency = GetConfigValueInt(NULL, "frequency", SWMIXER_OUTPUT_RATE);
1722         if(device->Frequency < 8000)
1723             device->Frequency = 8000;
1724
1725         fmt = GetConfigValue(NULL, "format", "AL_FORMAT_STEREO16");
1726         device->Format = GetFormatFromString(fmt);
1727
1728         device->NumUpdates = GetConfigValueInt(NULL, "periods", 4);
1729         if(device->NumUpdates < 2)
1730             device->NumUpdates = 4;
1731
1732         i = GetConfigValueInt(NULL, "refresh", 4096);
1733         if(i <= 0) i = 4096;
1734
1735         device->UpdateSize = GetConfigValueInt(NULL, "period_size", i/device->NumUpdates);
1736         if(device->UpdateSize <= 0)
1737             device->UpdateSize = i/device->NumUpdates;
1738
1739         device->MaxNoOfSources = GetConfigValueInt(NULL, "sources", 256);
1740         if((ALint)device->MaxNoOfSources <= 0)
1741             device->MaxNoOfSources = 256;
1742
1743         device->AuxiliaryEffectSlotMax = GetConfigValueInt(NULL, "slots", 4);
1744         if((ALint)device->AuxiliaryEffectSlotMax <= 0)
1745             device->AuxiliaryEffectSlotMax = 4;
1746
1747         device->lNumStereoSources = 1;
1748         device->lNumMonoSources = device->MaxNoOfSources - device->lNumStereoSources;
1749
1750         device->NumAuxSends = GetConfigValueInt(NULL, "sends", MAX_SENDS);
1751         if(device->NumAuxSends > MAX_SENDS)
1752             device->NumAuxSends = MAX_SENDS;
1753
1754         device->Bs2bLevel = GetConfigValueInt(NULL, "cf_level", 0);
1755
1756         if(aluChannelsFromFormat(device->Format) <= 2)
1757         {
1758             device->HeadDampen = GetConfigValueFloat(NULL, "head_dampen", DEFAULT_HEAD_DAMPEN);
1759             device->HeadDampen = __min(device->HeadDampen, 1.0f);
1760             device->HeadDampen = __max(device->HeadDampen, 0.0f);
1761         }
1762         else
1763             device->HeadDampen = 0.0f;
1764
1765         // Find a playback device to open
1766         SuspendContext(NULL);
1767         for(i = 0;BackendList[i].Init;i++)
1768         {
1769             device->Funcs = &BackendList[i].Funcs;
1770             if(ALCdevice_OpenPlayback(device, deviceName))
1771             {
1772                 device->next = g_pDeviceList;
1773                 g_pDeviceList = device;
1774                 g_ulDeviceCount++;
1775
1776                 bDeviceFound = AL_TRUE;
1777                 break;
1778             }
1779         }
1780         ProcessContext(NULL);
1781
1782         if (!bDeviceFound)
1783         {
1784             // No suitable output device found
1785             alcSetError(NULL, ALC_INVALID_VALUE);
1786             free(device);
1787             device = NULL;
1788         }
1789     }
1790     else
1791         alcSetError(NULL, ALC_OUT_OF_MEMORY);
1792
1793     return device;
1794 }
1795
1796
1797 /*
1798     alcCloseDevice
1799
1800     Close the specified Device
1801 */
1802 ALCAPI ALCboolean ALCAPIENTRY alcCloseDevice(ALCdevice *pDevice)
1803 {
1804     ALCboolean bReturn = ALC_FALSE;
1805     ALCdevice **list;
1806
1807     if(IsDevice(pDevice) && !pDevice->IsCaptureDevice)
1808     {
1809         SuspendContext(NULL);
1810
1811         list = &g_pDeviceList;
1812         while(*list != pDevice)
1813             list = &(*list)->next;
1814
1815         *list = (*list)->next;
1816         g_ulDeviceCount--;
1817
1818         ProcessContext(NULL);
1819
1820         if(pDevice->NumContexts > 0)
1821         {
1822 #ifdef _DEBUG
1823             AL_PRINT("alcCloseDevice(): destroying %u Context(s)\n", pDevice->NumContexts);
1824 #endif
1825             while(pDevice->NumContexts > 0)
1826                 alcDestroyContext(pDevice->Contexts[0]);
1827         }
1828         ALCdevice_ClosePlayback(pDevice);
1829
1830         if(pDevice->BufferCount > 0)
1831         {
1832 #ifdef _DEBUG
1833             AL_PRINT("alcCloseDevice(): deleting %d Buffer(s)\n", pDevice->BufferCount);
1834 #endif
1835             ReleaseALBuffers(pDevice);
1836         }
1837         if(pDevice->EffectCount > 0)
1838         {
1839 #ifdef _DEBUG
1840             AL_PRINT("alcCloseDevice(): deleting %d Effect(s)\n", pDevice->EffectCount);
1841 #endif
1842             ReleaseALEffects(pDevice);
1843         }
1844         if(pDevice->FilterCount > 0)
1845         {
1846 #ifdef _DEBUG
1847             AL_PRINT("alcCloseDevice(): deleting %d Filter(s)\n", pDevice->FilterCount);
1848 #endif
1849             ReleaseALFilters(pDevice);
1850         }
1851         if(pDevice->DatabufferCount > 0)
1852         {
1853 #ifdef _DEBUG
1854             AL_PRINT("alcCloseDevice(): deleting %d Databuffer(s)\n", pDevice->DatabufferCount);
1855 #endif
1856             ReleaseALDatabuffers(pDevice);
1857         }
1858
1859         free(pDevice->Bs2b);
1860         pDevice->Bs2b = NULL;
1861
1862         free(pDevice->szDeviceName);
1863         pDevice->szDeviceName = NULL;
1864
1865         free(pDevice->Contexts);
1866         pDevice->Contexts = NULL;
1867
1868         //Release device structure
1869         memset(pDevice, 0, sizeof(ALCdevice));
1870         free(pDevice);
1871
1872         bReturn = ALC_TRUE;
1873     }
1874     else
1875         alcSetError(pDevice, ALC_INVALID_DEVICE);
1876
1877     return bReturn;
1878 }
1879
1880
1881 ALCvoid ReleaseALC(ALCvoid)
1882 {
1883     free(alcDeviceList); alcDeviceList = NULL;
1884     alcDeviceListSize = 0;
1885     free(alcAllDeviceList); alcAllDeviceList = NULL;
1886     alcAllDeviceListSize = 0;
1887     free(alcCaptureDeviceList); alcCaptureDeviceList = NULL;
1888     alcCaptureDeviceListSize = 0;
1889
1890     free(alcDefaultDeviceSpecifier);
1891     alcDefaultDeviceSpecifier = NULL;
1892     free(alcDefaultAllDeviceSpecifier);
1893     alcDefaultAllDeviceSpecifier = NULL;
1894     free(alcCaptureDefaultDeviceSpecifier);
1895     alcCaptureDefaultDeviceSpecifier = NULL;
1896
1897 #ifdef _DEBUG
1898     if(g_ulDeviceCount > 0)
1899         AL_PRINT("exit(): closing %u Device%s\n", g_ulDeviceCount, (g_ulDeviceCount>1)?"s":"");
1900 #endif
1901
1902     while(g_pDeviceList)
1903     {
1904         if(g_pDeviceList->IsCaptureDevice)
1905             alcCaptureCloseDevice(g_pDeviceList);
1906         else
1907             alcCloseDevice(g_pDeviceList);
1908     }
1909 }
1910
1911 ///////////////////////////////////////////////////////