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->lNumStereoSources = 1;
 476     pContext->lNumMonoSources = pContext->Device->MaxNoOfSources - pContext->lNumStereoSources;
 477
 478     pContext->NumSends = GetConfigValueInt(NULL, "sends", MAX_SENDS);
 479     if(pContext->NumSends > MAX_SENDS)
 480         pContext->NumSends = MAX_SENDS;
 481
 482     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";
 483
 484     level = GetConfigValueInt(NULL, "cf_level", 0);
 485     if(level > 0 && level <= 6)
 486     {
 487         pContext->bs2b = calloc(1, sizeof(*pContext->bs2b));
 488         bs2b_set_srate(pContext->bs2b, pContext->Frequency);
 489         bs2b_set_level(pContext->bs2b, level);
 490     }
 491
 492     aluInitPanning(pContext);
 493 }
 494
 495
 496 /*
 497     ExitContext
 498
 499     Clean up Context, destroy any remaining Sources
 500 */
 501 static ALCvoid ExitContext(ALCcontext *pContext)
 502 {
 503     //Invalidate context
 504     pContext->LastError = AL_NO_ERROR;
 505     pContext->InUse = AL_FALSE;
 506
 507     free(pContext->bs2b);
 508     pContext->bs2b = NULL;
 509 }
 510
 511 ///////////////////////////////////////////////////////
 512
 513
 514 ///////////////////////////////////////////////////////
 515 // ALC Functions calls
 516
 517
 518 // This should probably move to another c file but for now ...
 519 ALCAPI ALCdevice* ALCAPIENTRY alcCaptureOpenDevice(const ALCchar *deviceName, ALCuint frequency, ALCenum format, ALCsizei SampleSize)
 520 {
 521     ALCboolean DeviceFound = ALC_FALSE;
 522     ALCdevice *pDevice = NULL;
 523     ALCint i;
 524
 525     InitAL();
 526
 527     if(SampleSize <= 0)
 528     {
 529         SetALCError(ALC_INVALID_VALUE);
 530         return NULL;
 531     }
 532
 533     if(deviceName && !deviceName[0])
 534         deviceName = NULL;
 535
 536     pDevice = malloc(sizeof(ALCdevice));
 537     if (pDevice)
 538     {
 539         //Initialise device structure
 540         memset(pDevice, 0, sizeof(ALCdevice));
 541
 542         //Validate device
 543         pDevice->IsCaptureDevice = AL_TRUE;
 544
 545         pDevice->Frequency = frequency;
 546         pDevice->Format = format;
 547
 548         for(i = 0;BackendList[i].Init;i++)
 549         {
 550             pDevice->Funcs = &BackendList[i].Funcs;
 551             if(ALCdevice_OpenCapture(pDevice, deviceName, frequency, format, SampleSize))
 552             {
 553                 SuspendContext(NULL);
 554                 pDevice->next = g_pDeviceList;
 555                 g_pDeviceList = pDevice;
 556                 g_ulDeviceCount++;
 557                 ProcessContext(NULL);
 558
 559                 DeviceFound = ALC_TRUE;
 560                 break;
 561             }
 562         }
 563
 564         if(!DeviceFound)
 565         {
 566             SetALCError(ALC_INVALID_VALUE);
 567             free(pDevice);
 568             pDevice = NULL;
 569         }
 570     }
 571     else
 572         SetALCError(ALC_OUT_OF_MEMORY);
 573
 574     return pDevice;
 575 }
 576
 577 ALCAPI ALCboolean ALCAPIENTRY alcCaptureCloseDevice(ALCdevice *pDevice)
 578 {
 579     ALCboolean bReturn = ALC_FALSE;
 580     ALCdevice **list;
 581
 582     if ((pDevice)&&(pDevice->IsCaptureDevice))
 583     {
 584         SuspendContext(NULL);
 585
 586         list = &g_pDeviceList;
 587         while(*list != pDevice)
 588             list = &(*list)->next;
 589
 590         *list = (*list)->next;
 591         g_ulDeviceCount--;
 592
 593         ProcessContext(NULL);
 594
 595         ALCdevice_CloseCapture(pDevice);
 596         free(pDevice);
 597
 598         bReturn = ALC_TRUE;
 599     }
 600     else
 601         SetALCError(ALC_INVALID_DEVICE);
 602
 603     return bReturn;
 604 }
 605
 606 ALCAPI void ALCAPIENTRY alcCaptureStart(ALCdevice *pDevice)
 607 {
 608     if ((pDevice)&&(pDevice->IsCaptureDevice))
 609         ALCdevice_StartCapture(pDevice);
 610     else
 611         SetALCError(ALC_INVALID_DEVICE);
 612 }
 613
 614 ALCAPI void ALCAPIENTRY alcCaptureStop(ALCdevice *pDevice)
 615 {
 616     if ((pDevice)&&(pDevice->IsCaptureDevice))
 617         ALCdevice_StopCapture(pDevice);
 618     else
 619         SetALCError(ALC_INVALID_DEVICE);
 620 }
 621
 622 ALCAPI void ALCAPIENTRY alcCaptureSamples(ALCdevice *pDevice, ALCvoid *pBuffer, ALCsizei lSamples)
 623 {
 624     if ((pDevice) && (pDevice->IsCaptureDevice))
 625         ALCdevice_CaptureSamples(pDevice, pBuffer, lSamples);
 626     else
 627         SetALCError(ALC_INVALID_DEVICE);
 628 }
 629
 630 /*
 631     alcGetError
 632
 633     Return last ALC generated error code
 634 */
 635 ALCAPI ALCenum ALCAPIENTRY alcGetError(ALCdevice *device)
 636 {
 637     ALCenum errorCode;
 638
 639     (void)device;
 640
 641     errorCode = g_eLastContextError;
 642     g_eLastContextError = ALC_NO_ERROR;
 643     return errorCode;
 644 }
 645
 646
 647 /*
 648     alcSuspendContext
 649
 650     Not functional
 651 */
 652 ALCAPI ALCvoid ALCAPIENTRY alcSuspendContext(ALCcontext *pContext)
 653 {
 654     // Not a lot happens here !
 655     (void)pContext;
 656 }
 657
 658
 659 /*
 660     alcProcessContext
 661
 662     Not functional
 663 */
 664 ALCAPI ALCvoid ALCAPIENTRY alcProcessContext(ALCcontext *pContext)
 665 {
 666     // Not a lot happens here !
 667     (void)pContext;
 668 }
 669
 670
 671 /*
 672     alcGetString
 673
 674     Returns information about the Device, and error strings
 675 */
 676 ALCAPI const ALCchar* ALCAPIENTRY alcGetString(ALCdevice *pDevice,ALCenum param)
 677 {
 678     const ALCchar *value = NULL;
 679
 680     InitAL();
 681
 682     switch (param)
 683     {
 684     case ALC_NO_ERROR:
 685         value = alcNoError;
 686         break;
 687
 688     case ALC_INVALID_ENUM:
 689         value = alcErrInvalidEnum;
 690         break;
 691
 692     case ALC_INVALID_VALUE:
 693         value = alcErrInvalidValue;
 694         break;
 695
 696     case ALC_INVALID_DEVICE:
 697         value = alcErrInvalidDevice;
 698         break;
 699
 700     case ALC_INVALID_CONTEXT:
 701         value = alcErrInvalidContext;
 702         break;
 703
 704     case ALC_OUT_OF_MEMORY:
 705         value = alcErrOutOfMemory;
 706         break;
 707
 708     case ALC_DEFAULT_DEVICE_SPECIFIER:
 709         value = alcDefaultDeviceSpecifier;
 710         break;
 711
 712     case ALC_DEVICE_SPECIFIER:
 713         if (pDevice)
 714             value = pDevice->szDeviceName;
 715         else
 716             value = alcDeviceList;
 717         break;
 718
 719     case ALC_ALL_DEVICES_SPECIFIER:
 720         value = alcAllDeviceList;
 721         break;
 722
 723     case ALC_DEFAULT_ALL_DEVICES_SPECIFIER:
 724         value = alcDefaultAllDeviceSpecifier;
 725         break;
 726
 727     case ALC_CAPTURE_DEVICE_SPECIFIER:
 728         if (pDevice)
 729             value = pDevice->szDeviceName;
 730         else
 731             value = alcCaptureDeviceList;
 732         break;
 733
 734     case ALC_CAPTURE_DEFAULT_DEVICE_SPECIFIER:
 735         value = alcCaptureDefaultDeviceSpecifier;
 736         break;
 737
 738     case ALC_EXTENSIONS:
 739         value = alcExtensionList;
 740         break;
 741
 742     default:
 743         SetALCError(ALC_INVALID_ENUM);
 744         break;
 745     }
 746
 747     return value;
 748 }
 749
 750
 751 /*
 752     alcGetIntegerv
 753
 754     Returns information about the Device and the version of Open AL
 755 */
 756 ALCAPI ALCvoid ALCAPIENTRY alcGetIntegerv(ALCdevice *device,ALCenum param,ALsizei size,ALCint *data)
 757 {
 758     InitAL();
 759
 760     if ((device)&&(device->IsCaptureDevice))
 761     {
 762         SuspendContext(NULL);
 763
 764         // Capture device
 765         switch (param)
 766         {
 767         case ALC_CAPTURE_SAMPLES:
 768             if ((size) && (data))
 769                 *data = ALCdevice_AvailableSamples(device);
 770             else
 771                 SetALCError(ALC_INVALID_VALUE);
 772             break;
 773
 774         default:
 775             SetALCError(ALC_INVALID_ENUM);
 776             break;
 777         }
 778
 779         ProcessContext(NULL);
 780     }
 781     else
 782     {
 783         if(data)
 784         {
 785             // Playback Device
 786             switch (param)
 787             {
 788                 case ALC_MAJOR_VERSION:
 789                     if(!size)
 790                         SetALCError(ALC_INVALID_VALUE);
 791                     else
 792                         *data = alcMajorVersion;
 793                     break;
 794
 795                 case ALC_MINOR_VERSION:
 796                     if(!size)
 797                         SetALCError(ALC_INVALID_VALUE);
 798                     else
 799                         *data = alcMinorVersion;
 800                     break;
 801
 802                 case ALC_EFX_MAJOR_VERSION:
 803                     if(!size)
 804                         SetALCError(ALC_INVALID_VALUE);
 805                     else
 806                         *data = alcEFXMajorVersion;
 807                     break;
 808
 809                 case ALC_EFX_MINOR_VERSION:
 810                     if(!size)
 811                         SetALCError(ALC_INVALID_VALUE);
 812                     else
 813                         *data = alcEFXMinorVersion;
 814                     break;
 815
 816                 case ALC_MAX_AUXILIARY_SENDS:
 817                     if(!size)
 818                         SetALCError(ALC_INVALID_VALUE);
 819                     else if(device && device->Context)
 820                         *data = device->Context->NumSends;
 821                     else
 822                         *data = MAX_SENDS;
 823                     break;
 824
 825                 case ALC_ATTRIBUTES_SIZE:
 826                     if(!device)
 827                         SetALCError(ALC_INVALID_DEVICE);
 828                     else if(!size)
 829                         SetALCError(ALC_INVALID_VALUE);
 830                     else
 831                         *data = 12;
 832                     break;
 833
 834                 case ALC_ALL_ATTRIBUTES:
 835                     if(!device)
 836                         SetALCError(ALC_INVALID_DEVICE);
 837                     else if (size < 7)
 838                         SetALCError(ALC_INVALID_VALUE);
 839                     else
 840                     {
 841                         int i = 0;
 842
 843                         data[i++] = ALC_FREQUENCY;
 844                         data[i++] = device->Frequency;
 845
 846                         data[i++] = ALC_REFRESH;
 847                         data[i++] = device->Frequency / device->UpdateSize;
 848
 849                         data[i++] = ALC_SYNC;
 850                         data[i++] = ALC_FALSE;
 851
 852                         SuspendContext(NULL);
 853                         if(device->Context && size >= 12)
 854                         {
 855                             data[i++] = ALC_MONO_SOURCES;
 856                             data[i++] = device->Context->lNumMonoSources;
 857
 858                             data[i++] = ALC_STEREO_SOURCES;
 859                             data[i++] = device->Context->lNumStereoSources;
 860
 861                             data[i++] = ALC_MAX_AUXILIARY_SENDS;
 862                             data[i++] = device->Context->NumSends;
 863                         }
 864                         ProcessContext(NULL);
 865
 866                         data[i++] = 0;
 867                     }
 868                     break;
 869
 870                 case ALC_FREQUENCY:
 871                     if(!device)
 872                         SetALCError(ALC_INVALID_DEVICE);
 873                     else if(!size)
 874                         SetALCError(ALC_INVALID_VALUE);
 875                     else
 876                         *data = device->Frequency;
 877                     break;
 878
 879                 case ALC_REFRESH:
 880                     if(!device)
 881                         SetALCError(ALC_INVALID_DEVICE);
 882                     else if(!size)
 883                         SetALCError(ALC_INVALID_VALUE);
 884                     else
 885                         *data = device->Frequency / device->UpdateSize;
 886                     break;
 887
 888                 case ALC_SYNC:
 889                     if(!device)
 890                         SetALCError(ALC_INVALID_DEVICE);
 891                     else if(!size)
 892                         SetALCError(ALC_INVALID_VALUE);
 893                     else
 894                         *data = ALC_FALSE;
 895                     break;
 896
 897                 case ALC_MONO_SOURCES:
 898                     if(!device || !device->Context)
 899                         SetALCError(ALC_INVALID_DEVICE);
 900                     else if (size != 1)
 901                         SetALCError(ALC_INVALID_VALUE);
 902                     else
 903                         *data = device->Context->lNumMonoSources;
 904                     break;
 905
 906                 case ALC_STEREO_SOURCES:
 907                     if(!device || !device->Context)
 908                         SetALCError(ALC_INVALID_DEVICE);
 909                     else if (size != 1)
 910                         SetALCError(ALC_INVALID_VALUE);
 911                     else
 912                         *data = device->Context->lNumStereoSources;
 913                     break;
 914
 915                 default:
 916                     SetALCError(ALC_INVALID_ENUM);
 917                     break;
 918             }
 919         }
 920         else if(size)
 921             SetALCError(ALC_INVALID_VALUE);
 922     }
 923
 924     return;
 925 }
 926
 927
 928 /*
 929     alcIsExtensionPresent
 930
 931     Determines if there is support for a particular extension
 932 */
 933 ALCAPI ALCboolean ALCAPIENTRY alcIsExtensionPresent(ALCdevice *device, const ALCchar *extName)
 934 {
 935     ALCboolean bResult = ALC_FALSE;
 936
 937     (void)device;
 938
 939     if (extName)
 940     {
 941         const char *ptr;
 942         size_t len;
 943
 944         len = strlen(extName);
 945         ptr = alcExtensionList;
 946         while(ptr && *ptr)
 947         {
 948             if(strncasecmp(ptr, extName, len) == 0 &&
 949                (ptr[len] == '\0' || isspace(ptr[len])))
 950             {
 951                 bResult = ALC_TRUE;
 952                 break;
 953             }
 954             if((ptr=strchr(ptr, ' ')) != NULL)
 955             {
 956                 do {
 957                     ++ptr;
 958                 } while(isspace(*ptr));
 959             }
 960         }
 961     }
 962     else
 963         SetALCError(ALC_INVALID_VALUE);
 964
 965     return bResult;
 966 }
 967
 968
 969 /*
 970     alcGetProcAddress
 971
 972     Retrieves the function address for a particular extension function
 973 */
 974 ALCAPI ALCvoid *  ALCAPIENTRY alcGetProcAddress(ALCdevice *device, const ALCchar *funcName)
 975 {
 976     ALCvoid *pFunction = NULL;
 977     ALsizei i = 0;
 978
 979     (void)device;
 980
 981     if (funcName)
 982     {
 983         while(alcFunctions[i].funcName &&
 984               strcmp(alcFunctions[i].funcName,funcName) != 0)
 985             i++;
 986         pFunction = alcFunctions[i].address;
 987     }
 988     else
 989         SetALCError(ALC_INVALID_VALUE);
 990
 991     return pFunction;
 992 }
 993
 994
 995 /*
 996     alcGetEnumValue
 997
 998     Get the value for a particular ALC Enumerated Value
 999 */
1000 ALCAPI ALCenum ALCAPIENTRY alcGetEnumValue(ALCdevice *device, const ALCchar *enumName)
1001 {
1002     ALsizei i = 0;
1003     ALCenum val;
1004
1005     (void)device;
1006
1007     while ((enumeration[i].enumName)&&(strcmp(enumeration[i].enumName,enumName)))
1008         i++;
1009     val = enumeration[i].value;
1010
1011     if(!enumeration[i].enumName)
1012         SetALCError(ALC_INVALID_VALUE);
1013
1014     return val;
1015 }
1016
1017
1018 /*
1019     alcCreateContext
1020
1021     Create and attach a Context to a particular Device.
1022 */
1023 ALCAPI ALCcontext* ALCAPIENTRY alcCreateContext(ALCdevice *device, const ALCint *attrList)
1024 {
1025     ALCcontext *ALContext = NULL;
1026     ALuint      ulAttributeIndex, ulRequestedStereoSources;
1027     ALuint      RequestedSends;
1028
1029     if ((device)&&(!device->IsCaptureDevice))
1030     {
1031         // Reset Context Last Error code
1032         g_eLastContextError = ALC_NO_ERROR;
1033
1034         // Current implementation only allows one Context per Device
1035         if(!device->Context)
1036         {
1037             ALContext = calloc(1, sizeof(ALCcontext));
1038             if(!ALContext)
1039             {
1040                 SetALCError(ALC_OUT_OF_MEMORY);
1041                 return NULL;
1042             }
1043
1044             ALContext->Device = device;
1045             InitContext(ALContext);
1046
1047             device->Context = ALContext;
1048
1049             SuspendContext(NULL);
1050
1051             ALContext->next = g_pContextList;
1052             g_pContextList = ALContext;
1053             g_ulContextCount++;
1054
1055             ProcessContext(NULL);
1056
1057             // Check for attributes
1058             if (attrList)
1059             {
1060                 ulAttributeIndex = 0;
1061                 while ((ulAttributeIndex < 10) && (attrList[ulAttributeIndex]))
1062                 {
1063                     if (attrList[ulAttributeIndex] == ALC_STEREO_SOURCES)
1064                     {
1065                         ulRequestedStereoSources = attrList[ulAttributeIndex + 1];
1066
1067                         if (ulRequestedStereoSources > ALContext->Device->MaxNoOfSources)
1068                             ulRequestedStereoSources = ALContext->Device->MaxNoOfSources;
1069
1070                         ALContext->lNumStereoSources = ulRequestedStereoSources;
1071                         ALContext->lNumMonoSources = ALContext->Device->MaxNoOfSources - ALContext->lNumStereoSources;
1072                     }
1073
1074                     if(attrList[ulAttributeIndex] == ALC_MAX_AUXILIARY_SENDS)
1075                     {
1076                         RequestedSends = attrList[ulAttributeIndex + 1];
1077
1078                         if(RequestedSends > ALContext->NumSends)
1079                             RequestedSends = ALContext->NumSends;
1080
1081                         ALContext->NumSends = RequestedSends;
1082                     }
1083
1084                     ulAttributeIndex += 2;
1085                 }
1086             }
1087         }
1088         else
1089         {
1090             SetALCError(ALC_INVALID_VALUE);
1091             ALContext = NULL;
1092         }
1093     }
1094     else
1095         SetALCError(ALC_INVALID_DEVICE);
1096
1097     return ALContext;
1098 }
1099
1100
1101 /*
1102     alcDestroyContext
1103
1104     Remove a Context
1105 */
1106 ALCAPI ALCvoid ALCAPIENTRY alcDestroyContext(ALCcontext *context)
1107 {
1108     ALCcontext **list;
1109
1110     InitAL();
1111
1112     // Lock context list
1113     SuspendContext(NULL);
1114
1115     if (IsContext(context))
1116     {
1117         // Lock context
1118         SuspendContext(context);
1119
1120         ReleaseALSources(context);
1121         ReleaseALAuxiliaryEffectSlots(context);
1122
1123         context->Device->Context = NULL;
1124
1125         list = &g_pContextList;
1126         while(*list != context)
1127             list = &(*list)->next;
1128
1129         *list = (*list)->next;
1130         g_ulContextCount--;
1131
1132         // Unlock context
1133         ProcessContext(context);
1134
1135         ExitContext(context);
1136
1137         // Free memory (MUST do this after ProcessContext)
1138         memset(context, 0, sizeof(ALCcontext));
1139         free(context);
1140     }
1141     else
1142         SetALCError(ALC_INVALID_CONTEXT);
1143
1144     ProcessContext(NULL);
1145 }
1146
1147
1148 /*
1149     alcGetCurrentContext
1150
1151     Returns the currently active Context
1152 */
1153 ALCAPI ALCcontext * ALCAPIENTRY alcGetCurrentContext(ALCvoid)
1154 {
1155     ALCcontext *pContext = NULL;
1156
1157     InitAL();
1158
1159     SuspendContext(NULL);
1160
1161     pContext = g_pContextList;
1162     while ((pContext) && (!pContext->InUse))
1163         pContext = pContext->next;
1164
1165     ProcessContext(NULL);
1166
1167     return pContext;
1168 }
1169
1170
1171 /*
1172     alcGetContextsDevice
1173
1174     Returns the Device that a particular Context is attached to
1175 */
1176 ALCAPI ALCdevice* ALCAPIENTRY alcGetContextsDevice(ALCcontext *pContext)
1177 {
1178     ALCdevice *pDevice = NULL;
1179
1180     InitAL();
1181
1182     SuspendContext(NULL);
1183     if (IsContext(pContext))
1184         pDevice = pContext->Device;
1185     else
1186         SetALCError(ALC_INVALID_CONTEXT);
1187     ProcessContext(NULL);
1188
1189     return pDevice;
1190 }
1191
1192
1193 /*
1194     alcMakeContextCurrent
1195
1196     Makes the given Context the active Context
1197 */
1198 ALCAPI ALCboolean ALCAPIENTRY alcMakeContextCurrent(ALCcontext *context)
1199 {
1200     ALCcontext *ALContext;
1201     ALboolean bReturn = AL_TRUE;
1202
1203     InitAL();
1204
1205     SuspendContext(NULL);
1206
1207     // context must be a valid Context or NULL
1208     if ((IsContext(context)) || (context == NULL))
1209     {
1210         if ((ALContext=alcGetCurrentContext()))
1211         {
1212             SuspendContext(ALContext);
1213             ALContext->InUse=AL_FALSE;
1214             ProcessContext(ALContext);
1215         }
1216
1217         if ((ALContext=context) && (ALContext->Device))
1218         {
1219             SuspendContext(ALContext);
1220             ALContext->InUse=AL_TRUE;
1221             ProcessContext(ALContext);
1222         }
1223     }
1224     else
1225     {
1226         SetALCError(ALC_INVALID_CONTEXT);
1227         bReturn = AL_FALSE;
1228     }
1229
1230     ProcessContext(NULL);
1231
1232     return bReturn;
1233 }
1234
1235
1236 /*
1237     alcOpenDevice
1238
1239     Open the Device specified.
1240 */
1241 ALCAPI ALCdevice* ALCAPIENTRY alcOpenDevice(const ALCchar *deviceName)
1242 {
1243     ALboolean bDeviceFound = AL_FALSE;
1244     ALCdevice *device;
1245     ALint i;
1246
1247     InitAL();
1248
1249     if(deviceName && !deviceName[0])
1250         deviceName = NULL;
1251
1252     device = malloc(sizeof(ALCdevice));
1253     if (device)
1254     {
1255         const char *fmt;
1256
1257         //Initialise device structure
1258         memset(device, 0, sizeof(ALCdevice));
1259
1260         //Validate device
1261         device->IsCaptureDevice = AL_FALSE;
1262
1263         //Set output format
1264         device->Frequency = GetConfigValueInt(NULL, "frequency", SWMIXER_OUTPUT_RATE);
1265         if((ALint)device->Frequency <= 0)
1266             device->Frequency = SWMIXER_OUTPUT_RATE;
1267
1268         fmt = GetConfigValue(NULL, "format", "AL_FORMAT_STEREO16");
1269         if(fmt[0])
1270             device->Format = alGetEnumValue(fmt);
1271
1272         if(!aluChannelsFromFormat(device->Format))
1273             device->Format = AL_FORMAT_STEREO16;
1274
1275         device->UpdateSize = GetConfigValueInt(NULL, "refresh", 4096);
1276         if((ALint)device->UpdateSize <= 0)
1277             device->UpdateSize = 4096;
1278
1279         device->MaxNoOfSources = GetConfigValueInt(NULL, "sources", 256);
1280         if((ALint)device->MaxNoOfSources <= 0)
1281             device->MaxNoOfSources = 256;
1282
1283         device->AuxiliaryEffectSlotMax = GetConfigValueInt(NULL, "slots", 4);
1284         if((ALint)device->AuxiliaryEffectSlotMax <= 0)
1285             device->AuxiliaryEffectSlotMax = 4;
1286
1287         // Find a playback device to open
1288         SuspendContext(NULL);
1289         for(i = 0;BackendList[i].Init;i++)
1290         {
1291             device->Funcs = &BackendList[i].Funcs;
1292             if(ALCdevice_OpenPlayback(device, deviceName))
1293             {
1294                 device->next = g_pDeviceList;
1295                 g_pDeviceList = device;
1296                 g_ulDeviceCount++;
1297
1298                 bDeviceFound = AL_TRUE;
1299                 break;
1300             }
1301         }
1302         ProcessContext(NULL);
1303
1304         if (!bDeviceFound)
1305         {
1306             // No suitable output device found
1307             SetALCError(ALC_INVALID_VALUE);
1308             free(device);
1309             device = NULL;
1310         }
1311     }
1312     else
1313         SetALCError(ALC_OUT_OF_MEMORY);
1314
1315     return device;
1316 }
1317
1318
1319 /*
1320     alcCloseDevice
1321
1322     Close the specified Device
1323 */
1324 ALCAPI ALCboolean ALCAPIENTRY alcCloseDevice(ALCdevice *pDevice)
1325 {
1326     ALCboolean bReturn = ALC_FALSE;
1327     ALCdevice **list;
1328
1329     if ((pDevice)&&(!pDevice->IsCaptureDevice))
1330     {
1331         SuspendContext(NULL);
1332
1333         list = &g_pDeviceList;
1334         while(*list != pDevice)
1335             list = &(*list)->next;
1336
1337         *list = (*list)->next;
1338         g_ulDeviceCount--;
1339
1340         ProcessContext(NULL);
1341
1342         if(pDevice->Context)
1343         {
1344 #ifdef _DEBUG
1345             AL_PRINT("alcCloseDevice(): destroying 1 Context\n");
1346 #endif
1347             alcDestroyContext(pDevice->Context);
1348         }
1349         ALCdevice_ClosePlayback(pDevice);
1350
1351         //Release device structure
1352         memset(pDevice, 0, sizeof(ALCdevice));
1353         free(pDevice);
1354
1355         bReturn = ALC_TRUE;
1356     }
1357     else
1358         SetALCError(ALC_INVALID_DEVICE);
1359
1360     return bReturn;
1361 }
1362
1363
1364 ALCvoid ReleaseALC(ALCvoid)
1365 {
1366 #ifdef _DEBUG
1367     if(g_ulDeviceCount > 0)
1368         AL_PRINT("exit(): closing %u Device%s\n", g_ulDeviceCount, (g_ulDeviceCount>1)?"s":"");
1369 #endif
1370
1371     while(g_pDeviceList)
1372     {
1373         if(g_pDeviceList->IsCaptureDevice)
1374             alcCaptureCloseDevice(g_pDeviceList);
1375         else
1376             alcCloseDevice(g_pDeviceList);
1377     }
1378 }
1379
1380 ///////////////////////////////////////////////////////