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 "bs2b.h"
  38 #include "alu.h"
  39
  40
  41 #define EmptyFuncs { NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL }
  42 static struct {
  43     const char *name;
  44     void (*Init)(BackendFuncs*);
  45     BackendFuncs Funcs;
  46 } BackendList[] = {
  47 #ifdef HAVE_ALSA
  48     { "alsa", alc_alsa_init, EmptyFuncs },
  49 #endif
  50 #ifdef HAVE_OSS
  51     { "oss", alc_oss_init, EmptyFuncs },
  52 #endif
  53 #ifdef HAVE_SOLARIS
  54     { "solaris", alc_solaris_init, EmptyFuncs },
  55 #endif
  56 #ifdef HAVE_DSOUND
  57     { "dsound", alcDSoundInit, EmptyFuncs },
  58 #endif
  59 #ifdef HAVE_WINMM
  60     { "winmm", alcWinMMInit, EmptyFuncs },
  61 #endif
  62 #ifdef HAVE_PORTAUDIO
  63     { "port", alc_pa_init, EmptyFuncs },
  64 #endif
  65 #ifdef HAVE_PULSEAUDIO
  66     { "pulse", alc_pulse_init, EmptyFuncs },
  67 #endif
  68
  69     { "wave", alc_wave_init, EmptyFuncs },
  70
  71     { NULL, NULL, EmptyFuncs }
  72 };
  73 #undef EmptyFuncs
  74
  75 ///////////////////////////////////////////////////////
  76
  77 #define ALC_EFX_MAJOR_VERSION                              0x20001
  78 #define ALC_EFX_MINOR_VERSION                              0x20002
  79 #define ALC_MAX_AUXILIARY_SENDS                            0x20003
  80
  81 ///////////////////////////////////////////////////////
  82 // STRING and EXTENSIONS
  83
  84 typedef struct ALCfunction_struct
  85 {
  86     ALCchar        *funcName;
  87     ALvoid        *address;
  88 } ALCfunction;
  89
  90 static ALCfunction  alcFunctions[] = {
  91     { "alcCreateContext",           (ALvoid *) alcCreateContext         },
  92     { "alcMakeContextCurrent",      (ALvoid *) alcMakeContextCurrent    },
  93     { "alcProcessContext",          (ALvoid *) alcProcessContext        },
  94     { "alcSuspendContext",          (ALvoid *) alcSuspendContext        },
  95     { "alcDestroyContext",          (ALvoid *) alcDestroyContext        },
  96     { "alcGetCurrentContext",       (ALvoid *) alcGetCurrentContext     },
  97     { "alcGetContextsDevice",       (ALvoid *) alcGetContextsDevice     },
  98     { "alcOpenDevice",              (ALvoid *) alcOpenDevice            },
  99     { "alcCloseDevice",             (ALvoid *) alcCloseDevice           },
 100     { "alcGetError",                (ALvoid *) alcGetError              },
 101     { "alcIsExtensionPresent",      (ALvoid *) alcIsExtensionPresent    },
 102     { "alcGetProcAddress",          (ALvoid *) alcGetProcAddress        },
 103     { "alcGetEnumValue",            (ALvoid *) alcGetEnumValue          },
 104     { "alcGetString",               (ALvoid *) alcGetString             },
 105     { "alcGetIntegerv",             (ALvoid *) alcGetIntegerv           },
 106     { "alcCaptureOpenDevice",       (ALvoid *) alcCaptureOpenDevice     },
 107     { "alcCaptureCloseDevice",      (ALvoid *) alcCaptureCloseDevice    },
 108     { "alcCaptureStart",            (ALvoid *) alcCaptureStart          },
 109     { "alcCaptureStop",             (ALvoid *) alcCaptureStop           },
 110     { "alcCaptureSamples",          (ALvoid *) alcCaptureSamples        },
 111     { NULL,                         (ALvoid *) NULL                     }
 112 };
 113
 114 static ALenums enumeration[]={
 115     // Types
 116     { (ALchar *)"ALC_INVALID",                          ALC_INVALID                         },
 117     { (ALchar *)"ALC_FALSE",                            ALC_FALSE                           },
 118     { (ALchar *)"ALC_TRUE",                             ALC_TRUE                            },
 119
 120     // ALC Properties
 121     { (ALchar *)"ALC_MAJOR_VERSION",                    ALC_MAJOR_VERSION                   },
 122     { (ALchar *)"ALC_MINOR_VERSION",                    ALC_MINOR_VERSION                   },
 123     { (ALchar *)"ALC_ATTRIBUTES_SIZE",                  ALC_ATTRIBUTES_SIZE                 },
 124     { (ALchar *)"ALC_ALL_ATTRIBUTES",                   ALC_ALL_ATTRIBUTES                  },
 125     { (ALchar *)"ALC_DEFAULT_DEVICE_SPECIFIER",         ALC_DEFAULT_DEVICE_SPECIFIER        },
 126     { (ALchar *)"ALC_DEVICE_SPECIFIER",                 ALC_DEVICE_SPECIFIER                },
 127     { (ALchar *)"ALC_ALL_DEVICES_SPECIFIER",            ALC_ALL_DEVICES_SPECIFIER           },
 128     { (ALchar *)"ALC_DEFAULT_ALL_DEVICES_SPECIFIER",    ALC_DEFAULT_ALL_DEVICES_SPECIFIER   },
 129     { (ALchar *)"ALC_EXTENSIONS",                       ALC_EXTENSIONS                      },
 130     { (ALchar *)"ALC_FREQUENCY",                        ALC_FREQUENCY                       },
 131     { (ALchar *)"ALC_REFRESH",                          ALC_REFRESH                         },
 132     { (ALchar *)"ALC_SYNC",                             ALC_SYNC                            },
 133     { (ALchar *)"ALC_MONO_SOURCES",                     ALC_MONO_SOURCES                    },
 134     { (ALchar *)"ALC_STEREO_SOURCES",                   ALC_STEREO_SOURCES                  },
 135     { (ALchar *)"ALC_CAPTURE_DEVICE_SPECIFIER",         ALC_CAPTURE_DEVICE_SPECIFIER        },
 136     { (ALchar *)"ALC_CAPTURE_DEFAULT_DEVICE_SPECIFIER", ALC_CAPTURE_DEFAULT_DEVICE_SPECIFIER},
 137     { (ALchar *)"ALC_CAPTURE_SAMPLES",                  ALC_CAPTURE_SAMPLES                 },
 138
 139     // EFX Properties
 140     { (ALchar *)"ALC_EFX_MAJOR_VERSION",                ALC_EFX_MAJOR_VERSION               },
 141     { (ALchar *)"ALC_EFX_MINOR_VERSION",                ALC_EFX_MINOR_VERSION               },
 142     { (ALchar *)"ALC_MAX_AUXILIARY_SENDS",              ALC_MAX_AUXILIARY_SENDS             },
 143
 144     // ALC Error Message
 145     { (ALchar *)"ALC_NO_ERROR",                         ALC_NO_ERROR                        },
 146     { (ALchar *)"ALC_INVALID_DEVICE",                   ALC_INVALID_DEVICE                  },
 147     { (ALchar *)"ALC_INVALID_CONTEXT",                  ALC_INVALID_CONTEXT                 },
 148     { (ALchar *)"ALC_INVALID_ENUM",                     ALC_INVALID_ENUM                    },
 149     { (ALchar *)"ALC_INVALID_VALUE",                    ALC_INVALID_VALUE                   },
 150     { (ALchar *)"ALC_OUT_OF_MEMORY",                    ALC_OUT_OF_MEMORY                   },
 151     { (ALchar *)NULL,                                   (ALenum)0 }
 152 };
 153 // Error strings
 154 static const ALCchar alcNoError[] = "No Error";
 155 static const ALCchar alcErrInvalidDevice[] = "Invalid Device";
 156 static const ALCchar alcErrInvalidContext[] = "Invalid Context";
 157 static const ALCchar alcErrInvalidEnum[] = "Invalid Enum";
 158 static const ALCchar alcErrInvalidValue[] = "Invalid Value";
 159 static const ALCchar alcErrOutOfMemory[] = "Out of Memory";
 160
 161 // Context strings
 162 static ALCchar alcDeviceList[2048];
 163 static ALCchar alcAllDeviceList[2048];
 164 static ALCchar alcCaptureDeviceList[2048];
 165 // Default is always the first in the list
 166 static ALCchar *alcDefaultDeviceSpecifier = alcDeviceList;
 167 static ALCchar *alcDefaultAllDeviceSpecifier = alcAllDeviceList;
 168 static ALCchar *alcCaptureDefaultDeviceSpecifier = alcCaptureDeviceList;
 169
 170
 171 static ALCchar alcExtensionList[] = "ALC_ENUMERATE_ALL_EXT ALC_ENUMERATION_EXT ALC_EXT_CAPTURE ALC_EXT_EFX";
 172 static ALCint alcMajorVersion = 1;
 173 static ALCint alcMinorVersion = 1;
 174
 175 static ALCint alcEFXMajorVersion = 1;
 176 static ALCint alcEFXMinorVersion = 0;
 177
 178 ///////////////////////////////////////////////////////
 179
 180
 181 ///////////////////////////////////////////////////////
 182 // Global Variables
 183
 184 static ALCdevice *g_pDeviceList = NULL;
 185 static ALCuint    g_ulDeviceCount = 0;
 186
 187 static CRITICAL_SECTION g_csMutex;
 188
 189 // Context List
 190 static ALCcontext *g_pContextList = NULL;
 191 static ALCuint     g_ulContextCount = 0;
 192
 193 // Context Error
 194 static ALCenum g_eLastContextError = ALC_NO_ERROR;
 195
 196 static ALboolean init_done = AL_FALSE;
 197
 198 ///////////////////////////////////////////////////////
 199
 200
 201 ///////////////////////////////////////////////////////
 202 // ALC Related helper functions
 203 #ifdef _WIN32
 204 BOOL APIENTRY DllMain(HANDLE hModule,DWORD ul_reason_for_call,LPVOID lpReserved)
 205 {
 206     (void)lpReserved;
 207
 208     // Perform actions based on the reason for calling.
 209     switch(ul_reason_for_call)
 210     {
 211         case DLL_PROCESS_ATTACH:
 212             DisableThreadLibraryCalls(hModule);
 213             break;
 214
 215         case DLL_PROCESS_DETACH:
 216             if(!init_done)
 217                 break;
 218             ReleaseALC();
 219             ReleaseALBuffers();
 220             ReleaseALEffects();
 221             ReleaseALFilters();
 222             FreeALConfig();
 223             ALTHUNK_EXIT();
 224             DeleteCriticalSection(&g_csMutex);
 225             break;
 226     }
 227     return TRUE;
 228 }
 229 #else
 230 #ifdef HAVE_GCC_DESTRUCTOR
 231 static void my_deinit() __attribute__((destructor));
 232 static void my_deinit()
 233 {
 234     static ALenum once = AL_FALSE;
 235     if(once || !init_done) return;
 236     once = AL_TRUE;
 237
 238     ReleaseALC();
 239     ReleaseALBuffers();
 240     ReleaseALEffects();
 241     ReleaseALFilters();
 242     FreeALConfig();
 243     ALTHUNK_EXIT();
 244     DeleteCriticalSection(&g_csMutex);
 245 }
 246 #endif
 247 #endif
 248
 249 static void InitAL(void)
 250 {
 251     if(!init_done)
 252     {
 253         int i;
 254         const char *devs, *str;
 255
 256         init_done = AL_TRUE;
 257
 258         InitializeCriticalSection(&g_csMutex);
 259         ALTHUNK_INIT();
 260         ReadALConfig();
 261
 262         devs = GetConfigValue(NULL, "drivers", "");
 263         if(devs[0])
 264         {
 265             int n;
 266             size_t len;
 267             const char *next = devs;
 268
 269             i = 0;
 270
 271             do {
 272                 devs = next;
 273                 next = strchr(devs, ',');
 274
 275                 if(!devs[0] || devs[0] == ',')
 276                     continue;
 277
 278                 len = (next ? ((size_t)(next-devs)) : strlen(devs));
 279                 for(n = i;BackendList[n].Init;n++)
 280                 {
 281                     if(len == strlen(BackendList[n].name) &&
 282                        strncmp(BackendList[n].name, devs, len) == 0)
 283                     {
 284                         const char *name = BackendList[i].name;
 285                         void (*Init)(BackendFuncs*) = BackendList[i].Init;
 286
 287                         BackendList[i].name = BackendList[n].name;
 288                         BackendList[i].Init = BackendList[n].Init;
 289
 290                         BackendList[n].name = name;
 291                         BackendList[n].Init = Init;
 292
 293                         i++;
 294                     }
 295                 }
 296             } while(next++);
 297
 298             BackendList[i].name = NULL;
 299             BackendList[i].Init = NULL;
 300         }
 301
 302         for(i = 0;BackendList[i].Init;i++)
 303             BackendList[i].Init(&BackendList[i].Funcs);
 304
 305         str = GetConfigValue(NULL, "stereodup", "false");
 306         DuplicateStereo = (strcasecmp(str, "true") == 0 ||
 307                            strcasecmp(str, "yes") == 0 ||
 308                            strcasecmp(str, "on") == 0 ||
 309                            atoi(str) != 0);
 310
 311         str = GetConfigValue(NULL, "excludefx", "");
 312         if(str[0])
 313         {
 314             const struct {
 315                 const char *name;
 316                 int type;
 317             } EffectList[] = {
 318                 { "eaxreverb", EAXREVERB },
 319                 { "reverb", REVERB },
 320                 { "echo", ECHO },
 321                 { NULL, 0 }
 322             };
 323             int n;
 324             size_t len;
 325             const char *next = str;
 326
 327             do {
 328                 str = next;
 329                 next = strchr(str, ',');
 330
 331                 if(!str[0] || next == str)
 332                     continue;
 333
 334                 len = (next ? ((size_t)(next-str)) : strlen(str));
 335                 for(n = 0;EffectList[n].name;n++)
 336                 {
 337                     if(len == strlen(EffectList[n].name) &&
 338                        strncmp(EffectList[n].name, str, len) == 0)
 339                         DisabledEffects[EffectList[n].type] = AL_TRUE;
 340                 }
 341             } while(next++);
 342         }
 343     }
 344 }
 345
 346 ALCchar *AppendDeviceList(char *name)
 347 {
 348     static size_t pos;
 349     ALCchar *ret = alcDeviceList+pos;
 350     if(pos >= sizeof(alcDeviceList))
 351     {
 352         AL_PRINT("Not enough room to add %s!\n", name);
 353         return alcDeviceList + sizeof(alcDeviceList) - 1;
 354     }
 355     pos += snprintf(alcDeviceList+pos, sizeof(alcDeviceList)-pos-1, "%s", name) + 1;
 356     return ret;
 357 }
 358
 359 ALCchar *AppendAllDeviceList(char *name)
 360 {
 361     static size_t pos;
 362     ALCchar *ret = alcAllDeviceList+pos;
 363     if(pos >= sizeof(alcAllDeviceList))
 364     {
 365         AL_PRINT("Not enough room to add %s!\n", name);
 366         return alcAllDeviceList + sizeof(alcAllDeviceList) - 1;
 367     }
 368     pos += snprintf(alcAllDeviceList+pos, sizeof(alcAllDeviceList)-pos-1, "%s", name) + 1;
 369     return ret;
 370 }
 371
 372 ALCchar *AppendCaptureDeviceList(char *name)
 373 {
 374     static size_t pos;
 375     ALCchar *ret = alcCaptureDeviceList+pos;
 376     if(pos >= sizeof(alcCaptureDeviceList))
 377     {
 378         AL_PRINT("Not enough room to add %s!\n", name);
 379         return alcCaptureDeviceList + sizeof(alcCaptureDeviceList) - 1;
 380     }
 381     pos += snprintf(alcCaptureDeviceList+pos, sizeof(alcCaptureDeviceList)-pos-1, "%s", name) + 1;
 382     return ret;
 383 }
 384
 385 /*
 386     IsContext
 387
 388     Check pContext is a valid Context pointer
 389 */
 390 static ALCboolean IsContext(ALCcontext *pContext)
 391 {
 392     ALCcontext *pTempContext;
 393
 394     pTempContext = g_pContextList;
 395     while (pTempContext && pTempContext != pContext)
 396         pTempContext = pTempContext->next;
 397
 398     return (pTempContext ? ALC_TRUE : ALC_FALSE);
 399 }
 400
 401
 402 /*
 403     SetALCError
 404
 405     Store latest ALC Error
 406 */
 407 ALCvoid SetALCError(ALenum errorCode)
 408 {
 409     g_eLastContextError = errorCode;
 410 }
 411
 412
 413 /*
 414     SuspendContext
 415
 416     Thread-safe entry
 417 */
 418 ALCvoid SuspendContext(ALCcontext *pContext)
 419 {
 420     (void)pContext;
 421     EnterCriticalSection(&g_csMutex);
 422 }
 423
 424
 425 /*
 426     ProcessContext
 427
 428     Thread-safe exit
 429 */
 430 ALCvoid ProcessContext(ALCcontext *pContext)
 431 {
 432     (void)pContext;
 433     LeaveCriticalSection(&g_csMutex);
 434 }
 435
 436
 437 /*
 438     InitContext
 439
 440     Initialize Context variables
 441 */
 442 static ALvoid InitContext(ALCcontext *pContext)
 443 {
 444     int level;
 445
 446     //Initialise listener
 447     pContext->Listener.Gain = 1.0f;
 448     pContext->Listener.MetersPerUnit = 1.0f;
 449     pContext->Listener.Position[0] = 0.0f;
 450     pContext->Listener.Position[1] = 0.0f;
 451     pContext->Listener.Position[2] = 0.0f;
 452     pContext->Listener.Velocity[0] = 0.0f;
 453     pContext->Listener.Velocity[1] = 0.0f;
 454     pContext->Listener.Velocity[2] = 0.0f;
 455     pContext->Listener.Forward[0] = 0.0f;
 456     pContext->Listener.Forward[1] = 0.0f;
 457     pContext->Listener.Forward[2] = -1.0f;
 458     pContext->Listener.Up[0] = 0.0f;
 459     pContext->Listener.Up[1] = 1.0f;
 460     pContext->Listener.Up[2] = 0.0f;
 461
 462     //Validate pContext
 463     pContext->LastError = AL_NO_ERROR;
 464     pContext->InUse = AL_FALSE;
 465
 466     //Set output format
 467     pContext->Frequency = pContext->Device->Frequency;
 468
 469     //Set globals
 470     pContext->DistanceModel = AL_INVERSE_DISTANCE_CLAMPED;
 471     pContext->DopplerFactor = 1.0f;
 472     pContext->DopplerVelocity = 1.0f;
 473     pContext->flSpeedOfSound = SPEEDOFSOUNDMETRESPERSEC;
 474
 475     pContext->ExtensionList = "AL_EXTX_buffer_sub_data AL_EXT_EXPONENT_DISTANCE AL_EXT_FLOAT32 AL_EXT_IMA4 AL_EXT_LINEAR_DISTANCE AL_EXT_MCFORMATS AL_EXT_OFFSET AL_EXTX_source_distance_model AL_LOKI_quadriphonic";
 476
 477     level = GetConfigValueInt(NULL, "cf_level", 0);
 478     if(level > 0 && level <= 6)
 479     {
 480         pContext->bs2b = calloc(1, sizeof(*pContext->bs2b));
 481         bs2b_set_srate(pContext->bs2b, pContext->Frequency);
 482         bs2b_set_level(pContext->bs2b, level);
 483     }
 484
 485     aluInitPanning(pContext);
 486 }
 487
 488
 489 /*
 490     ExitContext
 491
 492     Clean up Context, destroy any remaining Sources
 493 */
 494 static ALCvoid ExitContext(ALCcontext *pContext)
 495 {
 496     //Invalidate context
 497     pContext->LastError = AL_NO_ERROR;
 498     pContext->InUse = AL_FALSE;
 499
 500     free(pContext->bs2b);
 501     pContext->bs2b = NULL;
 502 }
 503
 504 ///////////////////////////////////////////////////////
 505
 506
 507 ///////////////////////////////////////////////////////
 508 // ALC Functions calls
 509
 510
 511 // This should probably move to another c file but for now ...
 512 ALCAPI ALCdevice* ALCAPIENTRY alcCaptureOpenDevice(const ALCchar *deviceName, ALCuint frequency, ALCenum format, ALCsizei SampleSize)
 513 {
 514     ALCboolean DeviceFound = ALC_FALSE;
 515     ALCdevice *pDevice = NULL;
 516     ALCint i;
 517
 518     InitAL();
 519
 520     if(SampleSize <= 0)
 521     {
 522         SetALCError(ALC_INVALID_VALUE);
 523         return NULL;
 524     }
 525
 526     if(deviceName && !deviceName[0])
 527         deviceName = NULL;
 528
 529     pDevice = malloc(sizeof(ALCdevice));
 530     if (pDevice)
 531     {
 532         //Initialise device structure
 533         memset(pDevice, 0, sizeof(ALCdevice));
 534
 535         //Validate device
 536         pDevice->IsCaptureDevice = AL_TRUE;
 537
 538         pDevice->Frequency = frequency;
 539         pDevice->Format = format;
 540
 541         for(i = 0;BackendList[i].Init;i++)
 542         {
 543             pDevice->Funcs = &BackendList[i].Funcs;
 544             if(ALCdevice_OpenCapture(pDevice, deviceName, frequency, format, SampleSize))
 545             {
 546                 SuspendContext(NULL);
 547                 pDevice->next = g_pDeviceList;
 548                 g_pDeviceList = pDevice;
 549                 g_ulDeviceCount++;
 550                 ProcessContext(NULL);
 551
 552                 DeviceFound = ALC_TRUE;
 553                 break;
 554             }
 555         }
 556
 557         if(!DeviceFound)
 558         {
 559             SetALCError(ALC_INVALID_VALUE);
 560             free(pDevice);
 561             pDevice = NULL;
 562         }
 563     }
 564     else
 565         SetALCError(ALC_OUT_OF_MEMORY);
 566
 567     return pDevice;
 568 }
 569
 570 ALCAPI ALCboolean ALCAPIENTRY alcCaptureCloseDevice(ALCdevice *pDevice)
 571 {
 572     ALCboolean bReturn = ALC_FALSE;
 573     ALCdevice **list;
 574
 575     if ((pDevice)&&(pDevice->IsCaptureDevice))
 576     {
 577         SuspendContext(NULL);
 578
 579         list = &g_pDeviceList;
 580         while(*list != pDevice)
 581             list = &(*list)->next;
 582
 583         *list = (*list)->next;
 584         g_ulDeviceCount--;
 585
 586         ProcessContext(NULL);
 587
 588         ALCdevice_CloseCapture(pDevice);
 589         free(pDevice);
 590
 591         bReturn = ALC_TRUE;
 592     }
 593     else
 594         SetALCError(ALC_INVALID_DEVICE);
 595
 596     return bReturn;
 597 }
 598
 599 ALCAPI void ALCAPIENTRY alcCaptureStart(ALCdevice *pDevice)
 600 {
 601     if ((pDevice)&&(pDevice->IsCaptureDevice))
 602         ALCdevice_StartCapture(pDevice);
 603     else
 604         SetALCError(ALC_INVALID_DEVICE);
 605 }
 606
 607 ALCAPI void ALCAPIENTRY alcCaptureStop(ALCdevice *pDevice)
 608 {
 609     if ((pDevice)&&(pDevice->IsCaptureDevice))
 610         ALCdevice_StopCapture(pDevice);
 611     else
 612         SetALCError(ALC_INVALID_DEVICE);
 613 }
 614
 615 ALCAPI void ALCAPIENTRY alcCaptureSamples(ALCdevice *pDevice, ALCvoid *pBuffer, ALCsizei lSamples)
 616 {
 617     if ((pDevice) && (pDevice->IsCaptureDevice))
 618         ALCdevice_CaptureSamples(pDevice, pBuffer, lSamples);
 619     else
 620         SetALCError(ALC_INVALID_DEVICE);
 621 }
 622
 623 /*
 624     alcGetError
 625
 626     Return last ALC generated error code
 627 */
 628 ALCAPI ALCenum ALCAPIENTRY alcGetError(ALCdevice *device)
 629 {
 630     ALCenum errorCode;
 631
 632     (void)device;
 633
 634     errorCode = g_eLastContextError;
 635     g_eLastContextError = ALC_NO_ERROR;
 636     return errorCode;
 637 }
 638
 639
 640 /*
 641     alcSuspendContext
 642
 643     Not functional
 644 */
 645 ALCAPI ALCvoid ALCAPIENTRY alcSuspendContext(ALCcontext *pContext)
 646 {
 647     // Not a lot happens here !
 648     (void)pContext;
 649 }
 650
 651
 652 /*
 653     alcProcessContext
 654
 655     Not functional
 656 */
 657 ALCAPI ALCvoid ALCAPIENTRY alcProcessContext(ALCcontext *pContext)
 658 {
 659     // Not a lot happens here !
 660     (void)pContext;
 661 }
 662
 663
 664 /*
 665     alcGetString
 666
 667     Returns information about the Device, and error strings
 668 */
 669 ALCAPI const ALCchar* ALCAPIENTRY alcGetString(ALCdevice *pDevice,ALCenum param)
 670 {
 671     const ALCchar *value = NULL;
 672
 673     InitAL();
 674
 675     switch (param)
 676     {
 677     case ALC_NO_ERROR:
 678         value = alcNoError;
 679         break;
 680
 681     case ALC_INVALID_ENUM:
 682         value = alcErrInvalidEnum;
 683         break;
 684
 685     case ALC_INVALID_VALUE:
 686         value = alcErrInvalidValue;
 687         break;
 688
 689     case ALC_INVALID_DEVICE:
 690         value = alcErrInvalidDevice;
 691         break;
 692
 693     case ALC_INVALID_CONTEXT:
 694         value = alcErrInvalidContext;
 695         break;
 696
 697     case ALC_OUT_OF_MEMORY:
 698         value = alcErrOutOfMemory;
 699         break;
 700
 701     case ALC_DEFAULT_DEVICE_SPECIFIER:
 702         value = alcDefaultDeviceSpecifier;
 703         break;
 704
 705     case ALC_DEVICE_SPECIFIER:
 706         if (pDevice)
 707             value = pDevice->szDeviceName;
 708         else
 709             value = alcDeviceList;
 710         break;
 711
 712     case ALC_ALL_DEVICES_SPECIFIER:
 713         value = alcAllDeviceList;
 714         break;
 715
 716     case ALC_DEFAULT_ALL_DEVICES_SPECIFIER:
 717         value = alcDefaultAllDeviceSpecifier;
 718         break;
 719
 720     case ALC_CAPTURE_DEVICE_SPECIFIER:
 721         if (pDevice)
 722             value = pDevice->szDeviceName;
 723         else
 724             value = alcCaptureDeviceList;
 725         break;
 726
 727     case ALC_CAPTURE_DEFAULT_DEVICE_SPECIFIER:
 728         value = alcCaptureDefaultDeviceSpecifier;
 729         break;
 730
 731     case ALC_EXTENSIONS:
 732         value = alcExtensionList;
 733         break;
 734
 735     default:
 736         SetALCError(ALC_INVALID_ENUM);
 737         break;
 738     }
 739
 740     return value;
 741 }
 742
 743
 744 /*
 745     alcGetIntegerv
 746
 747     Returns information about the Device and the version of Open AL
 748 */
 749 ALCAPI ALCvoid ALCAPIENTRY alcGetIntegerv(ALCdevice *device,ALCenum param,ALsizei size,ALCint *data)
 750 {
 751     InitAL();
 752
 753     if ((device)&&(device->IsCaptureDevice))
 754     {
 755         SuspendContext(NULL);
 756
 757         // Capture device
 758         switch (param)
 759         {
 760         case ALC_CAPTURE_SAMPLES:
 761             if ((size) && (data))
 762                 *data = ALCdevice_AvailableSamples(device);
 763             else
 764                 SetALCError(ALC_INVALID_VALUE);
 765             break;
 766
 767         default:
 768             SetALCError(ALC_INVALID_ENUM);
 769             break;
 770         }
 771
 772         ProcessContext(NULL);
 773     }
 774     else
 775     {
 776         if(data)
 777         {
 778             // Playback Device
 779             switch (param)
 780             {
 781                 case ALC_MAJOR_VERSION:
 782                     if(!size)
 783                         SetALCError(ALC_INVALID_VALUE);
 784                     else
 785                         *data = alcMajorVersion;
 786                     break;
 787
 788                 case ALC_MINOR_VERSION:
 789                     if(!size)
 790                         SetALCError(ALC_INVALID_VALUE);
 791                     else
 792                         *data = alcMinorVersion;
 793                     break;
 794
 795                 case ALC_EFX_MAJOR_VERSION:
 796                     if(!size)
 797                         SetALCError(ALC_INVALID_VALUE);
 798                     else
 799                         *data = alcEFXMajorVersion;
 800                     break;
 801
 802                 case ALC_EFX_MINOR_VERSION:
 803                     if(!size)
 804                         SetALCError(ALC_INVALID_VALUE);
 805                     else
 806                         *data = alcEFXMinorVersion;
 807                     break;
 808
 809                 case ALC_MAX_AUXILIARY_SENDS:
 810                     if(!size)
 811                         SetALCError(ALC_INVALID_VALUE);
 812                     else
 813                         *data = (device?device->NumAuxSends:MAX_SENDS);
 814                     break;
 815
 816                 case ALC_ATTRIBUTES_SIZE:
 817                     if(!device)
 818                         SetALCError(ALC_INVALID_DEVICE);
 819                     else if(!size)
 820                         SetALCError(ALC_INVALID_VALUE);
 821                     else
 822                         *data = 13;
 823                     break;
 824
 825                 case ALC_ALL_ATTRIBUTES:
 826                     if(!device)
 827                         SetALCError(ALC_INVALID_DEVICE);
 828                     else if (size < 13)
 829                         SetALCError(ALC_INVALID_VALUE);
 830                     else
 831                     {
 832                         int i = 0;
 833
 834                         SuspendContext(NULL);
 835                         data[i++] = ALC_FREQUENCY;
 836                         data[i++] = device->Frequency;
 837
 838                         data[i++] = ALC_REFRESH;
 839                         data[i++] = device->Frequency / device->UpdateSize;
 840
 841                         data[i++] = ALC_SYNC;
 842                         data[i++] = ALC_FALSE;
 843
 844                         data[i++] = ALC_MONO_SOURCES;
 845                         data[i++] = device->lNumMonoSources;
 846
 847                         data[i++] = ALC_STEREO_SOURCES;
 848                         data[i++] = device->lNumStereoSources;
 849
 850                         data[i++] = ALC_MAX_AUXILIARY_SENDS;
 851                         data[i++] = device->NumAuxSends;
 852
 853                         data[i++] = 0;
 854                         ProcessContext(NULL);
 855                     }
 856                     break;
 857
 858                 case ALC_FREQUENCY:
 859                     if(!device)
 860                         SetALCError(ALC_INVALID_DEVICE);
 861                     else if(!size)
 862                         SetALCError(ALC_INVALID_VALUE);
 863                     else
 864                         *data = device->Frequency;
 865                     break;
 866
 867                 case ALC_REFRESH:
 868                     if(!device)
 869                         SetALCError(ALC_INVALID_DEVICE);
 870                     else if(!size)
 871                         SetALCError(ALC_INVALID_VALUE);
 872                     else
 873                         *data = device->Frequency / device->UpdateSize;
 874                     break;
 875
 876                 case ALC_SYNC:
 877                     if(!device)
 878                         SetALCError(ALC_INVALID_DEVICE);
 879                     else if(!size)
 880                         SetALCError(ALC_INVALID_VALUE);
 881                     else
 882                         *data = ALC_FALSE;
 883                     break;
 884
 885                 case ALC_MONO_SOURCES:
 886                     if(!device || !device->Context)
 887                         SetALCError(ALC_INVALID_DEVICE);
 888                     else if (size != 1)
 889                         SetALCError(ALC_INVALID_VALUE);
 890                     else
 891                         *data = device->lNumMonoSources;
 892                     break;
 893
 894                 case ALC_STEREO_SOURCES:
 895                     if(!device || !device->Context)
 896                         SetALCError(ALC_INVALID_DEVICE);
 897                     else if (size != 1)
 898                         SetALCError(ALC_INVALID_VALUE);
 899                     else
 900                         *data = device->lNumStereoSources;
 901                     break;
 902
 903                 default:
 904                     SetALCError(ALC_INVALID_ENUM);
 905                     break;
 906             }
 907         }
 908         else if(size)
 909             SetALCError(ALC_INVALID_VALUE);
 910     }
 911
 912     return;
 913 }
 914
 915
 916 /*
 917     alcIsExtensionPresent
 918
 919     Determines if there is support for a particular extension
 920 */
 921 ALCAPI ALCboolean ALCAPIENTRY alcIsExtensionPresent(ALCdevice *device, const ALCchar *extName)
 922 {
 923     ALCboolean bResult = ALC_FALSE;
 924
 925     (void)device;
 926
 927     if (extName)
 928     {
 929         const char *ptr;
 930         size_t len;
 931
 932         len = strlen(extName);
 933         ptr = alcExtensionList;
 934         while(ptr && *ptr)
 935         {
 936             if(strncasecmp(ptr, extName, len) == 0 &&
 937                (ptr[len] == '\0' || isspace(ptr[len])))
 938             {
 939                 bResult = ALC_TRUE;
 940                 break;
 941             }
 942             if((ptr=strchr(ptr, ' ')) != NULL)
 943             {
 944                 do {
 945                     ++ptr;
 946                 } while(isspace(*ptr));
 947             }
 948         }
 949     }
 950     else
 951         SetALCError(ALC_INVALID_VALUE);
 952
 953     return bResult;
 954 }
 955
 956
 957 /*
 958     alcGetProcAddress
 959
 960     Retrieves the function address for a particular extension function
 961 */
 962 ALCAPI ALCvoid *  ALCAPIENTRY alcGetProcAddress(ALCdevice *device, const ALCchar *funcName)
 963 {
 964     ALCvoid *pFunction = NULL;
 965     ALsizei i = 0;
 966
 967     (void)device;
 968
 969     if (funcName)
 970     {
 971         while(alcFunctions[i].funcName &&
 972               strcmp(alcFunctions[i].funcName,funcName) != 0)
 973             i++;
 974         pFunction = alcFunctions[i].address;
 975     }
 976     else
 977         SetALCError(ALC_INVALID_VALUE);
 978
 979     return pFunction;
 980 }
 981
 982
 983 /*
 984     alcGetEnumValue
 985
 986     Get the value for a particular ALC Enumerated Value
 987 */
 988 ALCAPI ALCenum ALCAPIENTRY alcGetEnumValue(ALCdevice *device, const ALCchar *enumName)
 989 {
 990     ALsizei i = 0;
 991     ALCenum val;
 992
 993     (void)device;
 994
 995     while ((enumeration[i].enumName)&&(strcmp(enumeration[i].enumName,enumName)))
 996         i++;
 997     val = enumeration[i].value;
 998
 999     if(!enumeration[i].enumName)
1000         SetALCError(ALC_INVALID_VALUE);
1001
1002     return val;
1003 }
1004
1005
1006 /*
1007     alcCreateContext
1008
1009     Create and attach a Context to a particular Device.
1010 */
1011 ALCAPI ALCcontext* ALCAPIENTRY alcCreateContext(ALCdevice *device, const ALCint *attrList)
1012 {
1013     ALCcontext *ALContext = NULL;
1014     ALuint      ulAttributeIndex, ulRequestedStereoSources;
1015     ALuint      RequestedSends;
1016
1017     if ((device)&&(!device->IsCaptureDevice))
1018     {
1019         // Reset Context Last Error code
1020         g_eLastContextError = ALC_NO_ERROR;
1021
1022         // Current implementation only allows one Context per Device
1023         if(!device->Context)
1024         {
1025             ALContext = calloc(1, sizeof(ALCcontext));
1026             if(!ALContext)
1027             {
1028                 SetALCError(ALC_OUT_OF_MEMORY);
1029                 return NULL;
1030             }
1031
1032             ALContext->Device = device;
1033             InitContext(ALContext);
1034
1035             device->Context = ALContext;
1036
1037             SuspendContext(NULL);
1038
1039             ALContext->next = g_pContextList;
1040             g_pContextList = ALContext;
1041             g_ulContextCount++;
1042
1043             ProcessContext(NULL);
1044
1045             // Check for attributes
1046             if (attrList)
1047             {
1048                 ALCint numMono = ALContext->Device->lNumMonoSources;
1049                 ALCint numStereo = ALContext->Device->lNumStereoSources;
1050                 ALCuint numSends = ALContext->Device->NumAuxSends;
1051
1052                 ulAttributeIndex = 0;
1053                 while ((ulAttributeIndex < 10) && (attrList[ulAttributeIndex]))
1054                 {
1055                     if (attrList[ulAttributeIndex] == ALC_STEREO_SOURCES)
1056                     {
1057                         ulRequestedStereoSources = attrList[ulAttributeIndex + 1];
1058
1059                         if (ulRequestedStereoSources > ALContext->Device->MaxNoOfSources)
1060                             ulRequestedStereoSources = ALContext->Device->MaxNoOfSources;
1061
1062                         numStereo = ulRequestedStereoSources;
1063                         numMono = ALContext->Device->MaxNoOfSources - numStereo;
1064                     }
1065
1066                     if(attrList[ulAttributeIndex] == ALC_MAX_AUXILIARY_SENDS)
1067                     {
1068                         RequestedSends = attrList[ulAttributeIndex + 1];
1069
1070                         if(RequestedSends > ALContext->Device->NumAuxSends)
1071                             RequestedSends = ALContext->Device->NumAuxSends;
1072
1073                         numSends = RequestedSends;
1074                     }
1075
1076                     ulAttributeIndex += 2;
1077                 }
1078
1079                 ALContext->Device->lNumMonoSources = numMono;
1080                 ALContext->Device->lNumStereoSources = numStereo;
1081                 ALContext->Device->NumAuxSends = numSends;
1082             }
1083         }
1084         else
1085         {
1086             SetALCError(ALC_INVALID_VALUE);
1087             ALContext = NULL;
1088         }
1089     }
1090     else
1091         SetALCError(ALC_INVALID_DEVICE);
1092
1093     return ALContext;
1094 }
1095
1096
1097 /*
1098     alcDestroyContext
1099
1100     Remove a Context
1101 */
1102 ALCAPI ALCvoid ALCAPIENTRY alcDestroyContext(ALCcontext *context)
1103 {
1104     ALCcontext **list;
1105
1106     InitAL();
1107
1108     // Lock context list
1109     SuspendContext(NULL);
1110
1111     if (IsContext(context))
1112     {
1113         // Lock context
1114         SuspendContext(context);
1115
1116         ReleaseALSources(context);
1117         ReleaseALAuxiliaryEffectSlots(context);
1118
1119         context->Device->Context = NULL;
1120
1121         list = &g_pContextList;
1122         while(*list != context)
1123             list = &(*list)->next;
1124
1125         *list = (*list)->next;
1126         g_ulContextCount--;
1127
1128         // Unlock context
1129         ProcessContext(context);
1130
1131         ExitContext(context);
1132
1133         // Free memory (MUST do this after ProcessContext)
1134         memset(context, 0, sizeof(ALCcontext));
1135         free(context);
1136     }
1137     else
1138         SetALCError(ALC_INVALID_CONTEXT);
1139
1140     ProcessContext(NULL);
1141 }
1142
1143
1144 /*
1145     alcGetCurrentContext
1146
1147     Returns the currently active Context
1148 */
1149 ALCAPI ALCcontext * ALCAPIENTRY alcGetCurrentContext(ALCvoid)
1150 {
1151     ALCcontext *pContext = NULL;
1152
1153     InitAL();
1154
1155     SuspendContext(NULL);
1156
1157     pContext = g_pContextList;
1158     while ((pContext) && (!pContext->InUse))
1159         pContext = pContext->next;
1160
1161     ProcessContext(NULL);
1162
1163     return pContext;
1164 }
1165
1166
1167 /*
1168     alcGetContextsDevice
1169
1170     Returns the Device that a particular Context is attached to
1171 */
1172 ALCAPI ALCdevice* ALCAPIENTRY alcGetContextsDevice(ALCcontext *pContext)
1173 {
1174     ALCdevice *pDevice = NULL;
1175
1176     InitAL();
1177
1178     SuspendContext(NULL);
1179     if (IsContext(pContext))
1180         pDevice = pContext->Device;
1181     else
1182         SetALCError(ALC_INVALID_CONTEXT);
1183     ProcessContext(NULL);
1184
1185     return pDevice;
1186 }
1187
1188
1189 /*
1190     alcMakeContextCurrent
1191
1192     Makes the given Context the active Context
1193 */
1194 ALCAPI ALCboolean ALCAPIENTRY alcMakeContextCurrent(ALCcontext *context)
1195 {
1196     ALCcontext *ALContext;
1197     ALboolean bReturn = AL_TRUE;
1198
1199     InitAL();
1200
1201     SuspendContext(NULL);
1202
1203     // context must be a valid Context or NULL
1204     if ((IsContext(context)) || (context == NULL))
1205     {
1206         if ((ALContext=alcGetCurrentContext()))
1207         {
1208             SuspendContext(ALContext);
1209             ALContext->InUse=AL_FALSE;
1210             ProcessContext(ALContext);
1211         }
1212
1213         if ((ALContext=context) && (ALContext->Device))
1214         {
1215             SuspendContext(ALContext);
1216             ALContext->InUse=AL_TRUE;
1217             ProcessContext(ALContext);
1218         }
1219     }
1220     else
1221     {
1222         SetALCError(ALC_INVALID_CONTEXT);
1223         bReturn = AL_FALSE;
1224     }
1225
1226     ProcessContext(NULL);
1227
1228     return bReturn;
1229 }
1230
1231
1232 /*
1233     alcOpenDevice
1234
1235     Open the Device specified.
1236 */
1237 ALCAPI ALCdevice* ALCAPIENTRY alcOpenDevice(const ALCchar *deviceName)
1238 {
1239     ALboolean bDeviceFound = AL_FALSE;
1240     ALCdevice *device;
1241     ALint i;
1242
1243     InitAL();
1244
1245     if(deviceName && !deviceName[0])
1246         deviceName = NULL;
1247
1248     device = malloc(sizeof(ALCdevice));
1249     if (device)
1250     {
1251         const char *fmt;
1252
1253         //Initialise device structure
1254         memset(device, 0, sizeof(ALCdevice));
1255
1256         //Validate device
1257         device->IsCaptureDevice = AL_FALSE;
1258
1259         //Set output format
1260         device->Frequency = GetConfigValueInt(NULL, "frequency", SWMIXER_OUTPUT_RATE);
1261         if((ALint)device->Frequency <= 0)
1262             device->Frequency = SWMIXER_OUTPUT_RATE;
1263
1264         fmt = GetConfigValue(NULL, "format", "AL_FORMAT_STEREO16");
1265         if(fmt[0])
1266             device->Format = alGetEnumValue(fmt);
1267
1268         if(!aluChannelsFromFormat(device->Format))
1269             device->Format = AL_FORMAT_STEREO16;
1270
1271         device->UpdateSize = GetConfigValueInt(NULL, "refresh", 4096);
1272         if((ALint)device->UpdateSize <= 0)
1273             device->UpdateSize = 4096;
1274
1275         device->MaxNoOfSources = GetConfigValueInt(NULL, "sources", 256);
1276         if((ALint)device->MaxNoOfSources <= 0)
1277             device->MaxNoOfSources = 256;
1278
1279         device->AuxiliaryEffectSlotMax = GetConfigValueInt(NULL, "slots", 4);
1280         if((ALint)device->AuxiliaryEffectSlotMax <= 0)
1281             device->AuxiliaryEffectSlotMax = 4;
1282
1283         device->lNumStereoSources = 1;
1284         device->lNumMonoSources = device->MaxNoOfSources - device->lNumStereoSources;
1285
1286         device->NumAuxSends = GetConfigValueInt(NULL, "sends", MAX_SENDS);
1287         if(device->NumAuxSends > MAX_SENDS)
1288             device->NumAuxSends = MAX_SENDS;
1289
1290         // Find a playback device to open
1291         SuspendContext(NULL);
1292         for(i = 0;BackendList[i].Init;i++)
1293         {
1294             device->Funcs = &BackendList[i].Funcs;
1295             if(ALCdevice_OpenPlayback(device, deviceName))
1296             {
1297                 device->next = g_pDeviceList;
1298                 g_pDeviceList = device;
1299                 g_ulDeviceCount++;
1300
1301                 bDeviceFound = AL_TRUE;
1302                 break;
1303             }
1304         }
1305         ProcessContext(NULL);
1306
1307         if (!bDeviceFound)
1308         {
1309             // No suitable output device found
1310             SetALCError(ALC_INVALID_VALUE);
1311             free(device);
1312             device = NULL;
1313         }
1314     }
1315     else
1316         SetALCError(ALC_OUT_OF_MEMORY);
1317
1318     return device;
1319 }
1320
1321
1322 /*
1323     alcCloseDevice
1324
1325     Close the specified Device
1326 */
1327 ALCAPI ALCboolean ALCAPIENTRY alcCloseDevice(ALCdevice *pDevice)
1328 {
1329     ALCboolean bReturn = ALC_FALSE;
1330     ALCdevice **list;
1331
1332     if ((pDevice)&&(!pDevice->IsCaptureDevice))
1333     {
1334         SuspendContext(NULL);
1335
1336         list = &g_pDeviceList;
1337         while(*list != pDevice)
1338             list = &(*list)->next;
1339
1340         *list = (*list)->next;
1341         g_ulDeviceCount--;
1342
1343         ProcessContext(NULL);
1344
1345         if(pDevice->Context)
1346         {
1347 #ifdef _DEBUG
1348             AL_PRINT("alcCloseDevice(): destroying 1 Context\n");
1349 #endif
1350             alcDestroyContext(pDevice->Context);
1351         }
1352         ALCdevice_ClosePlayback(pDevice);
1353
1354         //Release device structure
1355         memset(pDevice, 0, sizeof(ALCdevice));
1356         free(pDevice);
1357
1358         bReturn = ALC_TRUE;
1359     }
1360     else
1361         SetALCError(ALC_INVALID_DEVICE);
1362
1363     return bReturn;
1364 }
1365
1366
1367 ALCvoid ReleaseALC(ALCvoid)
1368 {
1369 #ifdef _DEBUG
1370     if(g_ulDeviceCount > 0)
1371         AL_PRINT("exit(): closing %u Device%s\n", g_ulDeviceCount, (g_ulDeviceCount>1)?"s":"");
1372 #endif
1373
1374     while(g_pDeviceList)
1375     {
1376         if(g_pDeviceList->IsCaptureDevice)
1377             alcCaptureCloseDevice(g_pDeviceList);
1378         else
1379             alcCloseDevice(g_pDeviceList);
1380     }
1381 }
1382
1383 ///////////////////////////////////////////////////////