OpenAL32/Include/alMain.h

   1 #ifndef AL_MAIN_H
   2 #define AL_MAIN_H
   3
   4 #include <string.h>
   5 #include <stdio.h>
   6 #include <stddef.h>
   7 #include <stdarg.h>
   8 #include <assert.h>
   9 #include <math.h>
  10 #include <limits.h>
  11
  12 #ifdef HAVE_STRINGS_H
  13 #include <strings.h>
  14 #endif
  15 #ifdef HAVE_INTRIN_H
  16 #include <intrin.h>
  17 #endif
  18
  19 #include "AL/al.h"
  20 #include "AL/alc.h"
  21 #include "AL/alext.h"
  22
  23 #include "inprogext.h"
  24 #include "logging.h"
  25 #include "polymorphism.h"
  26 #include "static_assert.h"
  27 #include "align.h"
  28 #include "atomic.h"
  29 #include "uintmap.h"
  30 #include "vector.h"
  31 #include "alstring.h"
  32 #include "almalloc.h"
  33 #include "threads.h"
  34
  35
  36 #if defined(_WIN64)
  37 #define SZFMT "%I64u"
  38 #elif defined(_WIN32)
  39 #define SZFMT "%u"
  40 #else
  41 #define SZFMT "%zu"
  42 #endif
  43
  44
  45 #ifdef __GNUC__
  46 #define LIKELY(x) __builtin_expect(!!(x), !0)
  47 #define UNLIKELY(x) __builtin_expect(!!(x), 0)
  48 #else
  49 #define LIKELY(x) (!!(x))
  50 #define UNLIKELY(x) (!!(x))
  51 #endif
  52
  53 typedef ALint64SOFT ALint64;
  54 typedef ALuint64SOFT ALuint64;
  55
  56 #ifndef U64
  57 #if defined(_MSC_VER)
  58 #define U64(x) ((ALuint64)(x##ui64))
  59 #elif SIZEOF_LONG == 8
  60 #define U64(x) ((ALuint64)(x##ul))
  61 #elif SIZEOF_LONG_LONG == 8
  62 #define U64(x) ((ALuint64)(x##ull))
  63 #endif
  64 #endif
  65
  66 #ifndef UINT64_MAX
  67 #define UINT64_MAX U64(18446744073709551615)
  68 #endif
  69
  70 #ifndef UNUSED
  71 #if defined(__cplusplus)
  72 #define UNUSED(x)
  73 #elif defined(__GNUC__)
  74 #define UNUSED(x) UNUSED_##x __attribute__((unused))
  75 #elif defined(__LCLINT__)
  76 #define UNUSED(x) /*@unused@*/ x
  77 #else
  78 #define UNUSED(x) x
  79 #endif
  80 #endif
  81
  82 /* Calculates the size of a struct with N elements of a flexible array member.
  83  * GCC and Clang allow offsetof(Type, fam[N]) for this, but MSVC seems to have
  84  * trouble, so a bit more verbose workaround is needed.
  85  */
  86 #define FAM_SIZE(T, M, N)  (offsetof(T, M) + sizeof(((T*)NULL)->M[0])*(N))
  87
  88
  89 /* Define a CTZ64 macro (count trailing zeros, for 64-bit integers). The result
  90  * is *UNDEFINED* if the value is 0.
  91  */
  92 #ifdef __GNUC__
  93
  94 #if SIZEOF_LONG == 8
  95 #define CTZ64(x) __builtin_ctzl(x)
  96 #else
  97 #define CTZ64(x) __builtin_ctzll(x)
  98 #endif
  99
 100 #elif defined(HAVE_BITSCANFORWARD64_INTRINSIC)
 101
 102 static inline int msvc64_ctz64(ALuint64 v)
 103 {
 104     unsigned long idx = 64;
 105     _BitScanForward64(&idx, v);
 106     return (int)idx;
 107 }
 108 #define CTZ64(x) msvc64_ctz64(x)
 109
 110 #elif defined(HAVE_BITSCANFORWARD_INTRINSIC)
 111
 112 static inline int msvc_ctz64(ALuint64 v)
 113 {
 114     unsigned long idx = 64;
 115     if(!_BitScanForward(&idx, v&0xffffffff))
 116     {
 117         if(_BitScanForward(&idx, v>>32))
 118             idx += 32;
 119     }
 120     return (int)idx;
 121 }
 122 #define CTZ64(x) msvc_ctz64(x)
 123
 124 #else
 125
 126 /* There be black magics here. The popcnt64 method is derived from
 127  * https://graphics.stanford.edu/~seander/bithacks.html#CountBitsSetParallel
 128  * while the ctz-utilizing-popcnt algorithm is shown here
 129  * http://www.hackersdelight.org/hdcodetxt/ntz.c.txt
 130  * as the ntz2 variant. These likely aren't the most efficient methods, but
 131  * they're good enough if the GCC or MSVC intrinsics aren't available.
 132  */
 133 static inline int fallback_popcnt64(ALuint64 v)
 134 {
 135     v = v - ((v >> 1) & U64(0x5555555555555555));
 136     v = (v & U64(0x3333333333333333)) + ((v >> 2) & U64(0x3333333333333333));
 137     v = (v + (v >> 4)) & U64(0x0f0f0f0f0f0f0f0f);
 138     return (int)((v * U64(0x0101010101010101)) >> 56);
 139 }
 140
 141 static inline int fallback_ctz64(ALuint64 value)
 142 {
 143     return fallback_popcnt64(~value & (value - 1));
 144 }
 145 #define CTZ64(x) fallback_ctz64(x)
 146 #endif
 147
 148 static const union {
 149     ALuint u;
 150     ALubyte b[sizeof(ALuint)];
 151 } EndianTest = { 1 };
 152 #define IS_LITTLE_ENDIAN (EndianTest.b[0] == 1)
 153
 154 #define COUNTOF(x) (sizeof(x) / sizeof(0[x]))
 155
 156
 157 #ifdef __cplusplus
 158 extern "C" {
 159 #endif
 160
 161 struct Hrtf;
 162 struct HrtfEntry;
 163 struct DirectHrtfState;
 164 struct FrontStablizer;
 165 struct Compressor;
 166 struct ALCbackend;
 167 struct ALbuffer;
 168 struct ALeffect;
 169 struct ALfilter;
 170 struct ALsource;
 171 struct ALcontextProps;
 172 struct ALlistenerProps;
 173 struct ALvoiceProps;
 174 struct ALeffectslotProps;
 175
 176
 177 #define DEFAULT_OUTPUT_RATE  (44100)
 178 #define MIN_OUTPUT_RATE      (8000)
 179
 180
 181 /* Find the next power-of-2 for non-power-of-2 numbers. */
 182 inline ALuint NextPowerOf2(ALuint value)
 183 {
 184     if(value > 0)
 185     {
 186         value--;
 187         value |= value>>1;
 188         value |= value>>2;
 189         value |= value>>4;
 190         value |= value>>8;
 191         value |= value>>16;
 192     }
 193     return value+1;
 194 }
 195
 196 /** Round up a value to the next multiple. */
 197 inline size_t RoundUp(size_t value, size_t r)
 198 {
 199     value += r-1;
 200     return value - (value%r);
 201 }
 202
 203 /* Fast float-to-int conversion. Assumes the FPU is already in round-to-zero
 204  * mode. */
 205 inline ALint fastf2i(ALfloat f)
 206 {
 207 #ifdef HAVE_LRINTF
 208     return lrintf(f);
 209 #elif defined(_MSC_VER) && defined(_M_IX86)
 210     ALint i;
 211     __asm fld f
 212     __asm fistp i
 213     return i;
 214 #else
 215     return (ALint)f;
 216 #endif
 217 }
 218
 219
 220 enum DevProbe {
 221     ALL_DEVICE_PROBE,
 222     CAPTURE_DEVICE_PROBE
 223 };
 224
 225
 226 enum DistanceModel {
 227     InverseDistanceClamped  = AL_INVERSE_DISTANCE_CLAMPED,
 228     LinearDistanceClamped   = AL_LINEAR_DISTANCE_CLAMPED,
 229     ExponentDistanceClamped = AL_EXPONENT_DISTANCE_CLAMPED,
 230     InverseDistance  = AL_INVERSE_DISTANCE,
 231     LinearDistance   = AL_LINEAR_DISTANCE,
 232     ExponentDistance = AL_EXPONENT_DISTANCE,
 233     DisableDistance  = AL_NONE,
 234
 235     DefaultDistanceModel = InverseDistanceClamped
 236 };
 237
 238 enum Channel {
 239     FrontLeft = 0,
 240     FrontRight,
 241     FrontCenter,
 242     LFE,
 243     BackLeft,
 244     BackRight,
 245     BackCenter,
 246     SideLeft,
 247     SideRight,
 248
 249     UpperFrontLeft,
 250     UpperFrontRight,
 251     UpperBackLeft,
 252     UpperBackRight,
 253     LowerFrontLeft,
 254     LowerFrontRight,
 255     LowerBackLeft,
 256     LowerBackRight,
 257
 258     Aux0,
 259     Aux1,
 260     Aux2,
 261     Aux3,
 262     Aux4,
 263     Aux5,
 264     Aux6,
 265     Aux7,
 266     Aux8,
 267     Aux9,
 268     Aux10,
 269     Aux11,
 270     Aux12,
 271     Aux13,
 272     Aux14,
 273     Aux15,
 274
 275     InvalidChannel
 276 };
 277
 278
 279 /* Device formats */
 280 enum DevFmtType {
 281     DevFmtByte   = ALC_BYTE_SOFT,
 282     DevFmtUByte  = ALC_UNSIGNED_BYTE_SOFT,
 283     DevFmtShort  = ALC_SHORT_SOFT,
 284     DevFmtUShort = ALC_UNSIGNED_SHORT_SOFT,
 285     DevFmtInt    = ALC_INT_SOFT,
 286     DevFmtUInt   = ALC_UNSIGNED_INT_SOFT,
 287     DevFmtFloat  = ALC_FLOAT_SOFT,
 288
 289     DevFmtTypeDefault = DevFmtFloat
 290 };
 291 enum DevFmtChannels {
 292     DevFmtMono   = ALC_MONO_SOFT,
 293     DevFmtStereo = ALC_STEREO_SOFT,
 294     DevFmtQuad   = ALC_QUAD_SOFT,
 295     DevFmtX51    = ALC_5POINT1_SOFT,
 296     DevFmtX61    = ALC_6POINT1_SOFT,
 297     DevFmtX71    = ALC_7POINT1_SOFT,
 298     DevFmtAmbi3D = ALC_BFORMAT3D_SOFT,
 299
 300     /* Similar to 5.1, except using rear channels instead of sides */
 301     DevFmtX51Rear = 0x80000000,
 302
 303     DevFmtChannelsDefault = DevFmtStereo
 304 };
 305 #define MAX_OUTPUT_CHANNELS  (16)
 306
 307 ALsizei BytesFromDevFmt(enum DevFmtType type);
 308 ALsizei ChannelsFromDevFmt(enum DevFmtChannels chans, ALsizei ambiorder);
 309 inline ALsizei FrameSizeFromDevFmt(enum DevFmtChannels chans, enum DevFmtType type, ALsizei ambiorder)
 310 {
 311     return ChannelsFromDevFmt(chans, ambiorder) * BytesFromDevFmt(type);
 312 }
 313
 314 enum AmbiLayout {
 315     AmbiLayout_FuMa = ALC_FUMA_SOFT, /* FuMa channel order */
 316     AmbiLayout_ACN = ALC_ACN_SOFT,   /* ACN channel order */
 317
 318     AmbiLayout_Default = AmbiLayout_ACN
 319 };
 320
 321 enum AmbiNorm {
 322     AmbiNorm_FuMa = ALC_FUMA_SOFT, /* FuMa normalization */
 323     AmbiNorm_SN3D = ALC_SN3D_SOFT, /* SN3D normalization */
 324     AmbiNorm_N3D = ALC_N3D_SOFT,   /* N3D normalization */
 325
 326     AmbiNorm_Default = AmbiNorm_SN3D
 327 };
 328
 329
 330 enum DeviceType {
 331     Playback,
 332     Capture,
 333     Loopback
 334 };
 335
 336
 337 enum RenderMode {
 338     NormalRender,
 339     StereoPair,
 340     HrtfRender
 341 };
 342
 343
 344 /* The maximum number of Ambisonics coefficients. For a given order (o), the
 345  * size needed will be (o+1)**2, thus zero-order has 1, first-order has 4,
 346  * second-order has 9, third-order has 16, and fourth-order has 25.
 347  */
 348 #define MAX_AMBI_ORDER  3
 349 #define MAX_AMBI_COEFFS ((MAX_AMBI_ORDER+1) * (MAX_AMBI_ORDER+1))
 350
 351 /* A bitmask of ambisonic channels with height information. If none of these
 352  * channels are used/needed, there's no height (e.g. with most surround sound
 353  * speaker setups). This only specifies up to 4th order, which is the highest
 354  * order a 32-bit mask value can specify (a 64-bit mask could handle up to 7th
 355  * order). This is ACN ordering, with bit 0 being ACN 0, etc.
 356  */
 357 #define AMBI_PERIPHONIC_MASK (0xfe7ce4)
 358
 359 /* The maximum number of Ambisonic coefficients for 2D (non-periphonic)
 360  * representation. This is 2 per each order above zero-order, plus 1 for zero-
 361  * order. Or simply, o*2 + 1.
 362  */
 363 #define MAX_AMBI2D_COEFFS (MAX_AMBI_ORDER*2 + 1)
 364
 365
 366 typedef ALfloat ChannelConfig[MAX_AMBI_COEFFS];
 367 typedef struct BFChannelConfig {
 368     ALfloat Scale;
 369     ALsizei Index;
 370 } BFChannelConfig;
 371
 372 typedef union AmbiConfig {
 373     /* Ambisonic coefficients for mixing to the dry buffer. */
 374     ChannelConfig Coeffs[MAX_OUTPUT_CHANNELS];
 375     /* Coefficient channel mapping for mixing to the dry buffer. */
 376     BFChannelConfig Map[MAX_OUTPUT_CHANNELS];
 377 } AmbiConfig;
 378
 379
 380 typedef struct BufferSubList {
 381     ALuint64 FreeMask;
 382     struct ALbuffer *Buffers; /* 64 */
 383 } BufferSubList;
 384 TYPEDEF_VECTOR(BufferSubList, vector_BufferSubList)
 385
 386 typedef struct EffectSubList {
 387     ALuint64 FreeMask;
 388     struct ALeffect *Effects; /* 64 */
 389 } EffectSubList;
 390 TYPEDEF_VECTOR(EffectSubList, vector_EffectSubList)
 391
 392 typedef struct FilterSubList {
 393     ALuint64 FreeMask;
 394     struct ALfilter *Filters; /* 64 */
 395 } FilterSubList;
 396 TYPEDEF_VECTOR(FilterSubList, vector_FilterSubList)
 397
 398 typedef struct SourceSubList {
 399     ALuint64 FreeMask;
 400     struct ALsource *Sources; /* 64 */
 401 } SourceSubList;
 402 TYPEDEF_VECTOR(SourceSubList, vector_SourceSubList)
 403
 404 /* Effect slots are rather large, and apps aren't likely to have more than one
 405  * or two (let alone 64), so hold them individually.
 406  */
 407 typedef struct ALeffectslot *ALeffectslotPtr;
 408 TYPEDEF_VECTOR(ALeffectslotPtr, vector_ALeffectslotPtr)
 409
 410
 411 typedef struct EnumeratedHrtf {
 412     al_string name;
 413
 414     struct HrtfEntry *hrtf;
 415 } EnumeratedHrtf;
 416 TYPEDEF_VECTOR(EnumeratedHrtf, vector_EnumeratedHrtf)
 417
 418
 419 /* Maximum delay in samples for speaker distance compensation. */
 420 #define MAX_DELAY_LENGTH 1024
 421
 422 typedef struct DistanceComp {
 423     ALfloat Gain;
 424     ALsizei Length; /* Valid range is [0...MAX_DELAY_LENGTH). */
 425     ALfloat *Buffer;
 426 } DistanceComp;
 427
 428 /* Size for temporary storage of buffer data, in ALfloats. Larger values need
 429  * more memory, while smaller values may need more iterations. The value needs
 430  * to be a sensible size, however, as it constrains the max stepping value used
 431  * for mixing, as well as the maximum number of samples per mixing iteration.
 432  */
 433 #define BUFFERSIZE 2048
 434
 435 typedef struct DryMixParams {
 436     AmbiConfig Ambi;
 437     /* Number of coefficients in each Ambi.Coeffs to mix together (4 for first-
 438      * order, 9 for second-order, etc). If the count is 0, Ambi.Map is used
 439      * instead to map each output to a coefficient index.
 440      */
 441     ALsizei CoeffCount;
 442
 443     ALfloat (*Buffer)[BUFFERSIZE];
 444     ALsizei NumChannels;
 445     ALsizei NumChannelsPerOrder[MAX_AMBI_ORDER+1];
 446 } DryMixParams;
 447
 448 typedef struct BFMixParams {
 449     AmbiConfig Ambi;
 450     /* Will only be 4 or 0. */
 451     ALsizei CoeffCount;
 452
 453     ALfloat (*Buffer)[BUFFERSIZE];
 454     ALsizei NumChannels;
 455 } BFMixParams;
 456
 457 typedef struct RealMixParams {
 458     enum Channel ChannelName[MAX_OUTPUT_CHANNELS];
 459
 460     ALfloat (*Buffer)[BUFFERSIZE];
 461     ALsizei NumChannels;
 462 } RealMixParams;
 463
 464 struct ALCdevice_struct
 465 {
 466     RefCount ref;
 467
 468     ALCboolean Connected;
 469     enum DeviceType Type;
 470
 471     ALuint Frequency;
 472     ALuint UpdateSize;
 473     ALuint NumUpdates;
 474     enum DevFmtChannels FmtChans;
 475     enum DevFmtType     FmtType;
 476     ALboolean IsHeadphones;
 477     ALsizei AmbiOrder;
 478     /* For DevFmtAmbi* output only, specifies the channel order and
 479      * normalization.
 480      */
 481     enum AmbiLayout AmbiLayout;
 482     enum AmbiNorm   AmbiScale;
 483
 484     al_string DeviceName;
 485
 486     ATOMIC(ALCenum) LastError;
 487
 488     // Maximum number of sources that can be created
 489     ALuint SourcesMax;
 490     // Maximum number of slots that can be created
 491     ALuint AuxiliaryEffectSlotMax;
 492
 493     ALCuint NumMonoSources;
 494     ALCuint NumStereoSources;
 495     ALsizei NumAuxSends;
 496
 497     // Map of Buffers for this device
 498     vector_BufferSubList BufferList;
 499     almtx_t BufferLock;
 500
 501     // Map of Effects for this device
 502     vector_EffectSubList EffectList;
 503     almtx_t EffectLock;
 504
 505     // Map of Filters for this device
 506     vector_FilterSubList FilterList;
 507     almtx_t FilterLock;
 508
 509     /* HRTF state and info */
 510     struct DirectHrtfState *Hrtf;
 511     al_string HrtfName;
 512     struct Hrtf *HrtfHandle;
 513     vector_EnumeratedHrtf HrtfList;
 514     ALCenum HrtfStatus;
 515
 516     /* UHJ encoder state */
 517     struct Uhj2Encoder *Uhj_Encoder;
 518
 519     /* High quality Ambisonic decoder */
 520     struct BFormatDec *AmbiDecoder;
 521
 522     /* Stereo-to-binaural filter */
 523     struct bs2b *Bs2b;
 524
 525     /* First-order ambisonic upsampler for higher-order output */
 526     struct AmbiUpsampler *AmbiUp;
 527
 528     /* Rendering mode. */
 529     enum RenderMode Render_Mode;
 530
 531     // Device flags
 532     ALuint Flags;
 533
 534     ALuint64 ClockBase;
 535     ALuint SamplesDone;
 536
 537     /* Temp storage used for mixer processing. */
 538     alignas(16) ALfloat TempBuffer[4][BUFFERSIZE];
 539
 540     /* The "dry" path corresponds to the main output. */
 541     DryMixParams Dry;
 542
 543     /* First-order ambisonics output, to be upsampled to the dry buffer if different. */
 544     BFMixParams FOAOut;
 545
 546     /* "Real" output, which will be written to the device buffer. May alias the
 547      * dry buffer.
 548      */
 549     RealMixParams RealOut;
 550
 551     struct FrontStablizer *Stablizer;
 552
 553     struct Compressor *Limiter;
 554
 555     /* The average speaker distance as determined by the ambdec configuration
 556      * (or alternatively, by the NFC-HOA reference delay). Only used for NFC.
 557      */
 558     ALfloat AvgSpeakerDist;
 559
 560     /* Delay buffers used to compensate for speaker distances. */
 561     DistanceComp ChannelDelay[MAX_OUTPUT_CHANNELS];
 562
 563     /* Dithering control. */
 564     ALfloat DitherDepth;
 565     ALuint DitherSeed;
 566
 567     /* Running count of the mixer invocations, in 31.1 fixed point. This
 568      * actually increments *twice* when mixing, first at the start and then at
 569      * the end, so the bottom bit indicates if the device is currently mixing
 570      * and the upper bits indicates how many mixes have been done.
 571      */
 572     RefCount MixCount;
 573
 574     // Contexts created on this device
 575     ATOMIC(ALCcontext*) ContextList;
 576
 577     almtx_t BackendLock;
 578     struct ALCbackend *Backend;
 579
 580     ALCdevice *volatile next;
 581 };
 582
 583 // Frequency was requested by the app or config file
 584 #define DEVICE_FREQUENCY_REQUEST                 (1u<<1)
 585 // Channel configuration was requested by the config file
 586 #define DEVICE_CHANNELS_REQUEST                  (1u<<2)
 587 // Sample type was requested by the config file
 588 #define DEVICE_SAMPLE_TYPE_REQUEST               (1u<<3)
 589
 590 // Specifies if the DSP is paused at user request
 591 #define DEVICE_PAUSED                            (1u<<30)
 592
 593 // Specifies if the device is currently running
 594 #define DEVICE_RUNNING                           (1u<<31)
 595
 596
 597 /* Nanosecond resolution for the device clock time. */
 598 #define DEVICE_CLOCK_RES  U64(1000000000)
 599
 600
 601 /* Must be less than 15 characters (16 including terminating null) for
 602  * compatibility with pthread_setname_np limitations. */
 603 #define MIXER_THREAD_NAME "alsoft-mixer"
 604
 605 #define RECORD_THREAD_NAME "alsoft-record"
 606
 607
 608 enum {
 609     EventType_SourceStateChange = 1<<0,
 610     EventType_BufferCompleted   = 1<<1,
 611     EventType_Error             = 1<<2,
 612     EventType_Performance       = 1<<3,
 613     EventType_Deprecated        = 1<<4,
 614 };
 615
 616 struct ALCcontext_struct {
 617     RefCount ref;
 618
 619     struct ALlistener *Listener;
 620
 621     vector_SourceSubList SourceList;
 622     ALuint NumSources;
 623     almtx_t SourceLock;
 624
 625     vector_ALeffectslotPtr EffectSlotList;
 626     almtx_t EffectSlotLock;
 627
 628     ATOMIC(ALenum) LastError;
 629
 630     enum DistanceModel DistanceModel;
 631     ALboolean SourceDistanceModel;
 632
 633     ALfloat DopplerFactor;
 634     ALfloat DopplerVelocity;
 635     ALfloat SpeedOfSound;
 636     ALfloat MetersPerUnit;
 637
 638     ATOMIC_FLAG PropsClean;
 639     ATOMIC(ALenum) DeferUpdates;
 640
 641     RWLock PropLock;
 642
 643     /* Counter for the pre-mixing updates, in 31.1 fixed point (lowest bit
 644      * indicates if updates are currently happening).
 645      */
 646     RefCount UpdateCount;
 647     ATOMIC(ALenum) HoldUpdates;
 648
 649     ALfloat GainBoost;
 650
 651     ATOMIC(struct ALcontextProps*) Update;
 652
 653     /* Linked lists of unused property containers, free to use for future
 654      * updates.
 655      */
 656     ATOMIC(struct ALcontextProps*) FreeContextProps;
 657     ATOMIC(struct ALlistenerProps*) FreeListenerProps;
 658     ATOMIC(struct ALvoiceProps*) FreeVoiceProps;
 659     ATOMIC(struct ALeffectslotProps*) FreeEffectslotProps;
 660
 661     struct ALvoice **Voices;
 662     ALsizei VoiceCount;
 663     ALsizei MaxVoices;
 664
 665     ATOMIC(struct ALeffectslotArray*) ActiveAuxSlots;
 666
 667     almtx_t EventLock;
 668     ALbitfieldSOFT EnabledEvts;
 669     ALEVENTPROCSOFT EventCb;
 670     void *EventParam;
 671
 672     /* Default effect slot */
 673     struct ALeffectslot *DefaultSlot;
 674
 675     ALCdevice  *Device;
 676     const ALCchar *ExtensionList;
 677
 678     ALCcontext *volatile next;
 679
 680     /* Memory space used by the listener (and possibly default effect slot) */
 681     alignas(16) ALCbyte _listener_mem[];
 682 };
 683
 684 ALCcontext *GetContextRef(void);
 685
 686 void ALCcontext_DecRef(ALCcontext *context);
 687
 688 void ALCcontext_DeferUpdates(ALCcontext *context);
 689 void ALCcontext_ProcessUpdates(ALCcontext *context);
 690
 691 void AllocateVoices(ALCcontext *context, ALsizei num_voices, ALsizei old_sends);
 692
 693 void AppendAllDevicesList(const ALCchar *name);
 694 void AppendCaptureDeviceList(const ALCchar *name);
 695
 696
 697 extern ALint RTPrioLevel;
 698 void SetRTPriority(void);
 699
 700 void SetDefaultChannelOrder(ALCdevice *device);
 701 void SetDefaultWFXChannelOrder(ALCdevice *device);
 702
 703 const ALCchar *DevFmtTypeString(enum DevFmtType type);
 704 const ALCchar *DevFmtChannelsString(enum DevFmtChannels chans);
 705
 706 inline ALint GetChannelIndex(const enum Channel names[MAX_OUTPUT_CHANNELS], enum Channel chan)
 707 {
 708     ALint i;
 709     for(i = 0;i < MAX_OUTPUT_CHANNELS;i++)
 710     {
 711         if(names[i] == chan)
 712             return i;
 713     }
 714     return -1;
 715 }
 716 /**
 717  * GetChannelIdxByName
 718  *
 719  * Returns the index for the given channel name (e.g. FrontCenter), or -1 if it
 720  * doesn't exist.
 721  */
 722 inline ALint GetChannelIdxByName(const RealMixParams *real, enum Channel chan)
 723 { return GetChannelIndex(real->ChannelName, chan); }
 724
 725
 726 inline void LockBufferList(ALCdevice *device)
 727 { almtx_lock(&device->BufferLock); }
 728 inline void UnlockBufferList(ALCdevice *device)
 729 { almtx_unlock(&device->BufferLock); }
 730
 731
 732 vector_al_string SearchDataFiles(const char *match, const char *subdir);
 733
 734 #ifdef __cplusplus
 735 }
 736 #endif
 737
 738 #endif