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      1 /*
      2  * Copyright (C) 2010 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 /** \file sles_allinclusive.h Everything including the kitchen sink */
     18 
     19 #include <SLES/OpenSLES.h>
     20 #include <OMXAL/OpenMAXAL.h>
     21 #ifdef ANDROID
     22 #include <SLES/OpenSLES_Android.h>
     23 #include <OMXAL/OpenMAXAL_Android.h>
     24 #endif
     25 #include <stddef.h> // offsetof
     26 #include <stdlib.h> // malloc
     27 #include <string.h> // memcmp
     28 #include <strings.h>
     29 #include <stdio.h>  // debugging
     30 #include <assert.h> // debugging
     31 #include <pthread.h>
     32 #include <unistd.h> // usleep
     33 #include <errno.h>
     34 
     35 #ifndef __cplusplus
     36 typedef int bool;
     37 #ifndef false
     38 #define false 0
     39 #endif
     40 #ifndef true
     41 #define true 1
     42 #endif
     43 #endif
     44 
     45 // The OpenSLES.h definitions of SL_PROFILES_... have casts, so are unusable by preprocessor
     46 #define USE_PROFILES_PHONE    0x1   // == SL_PROFILES_PHONE
     47 #define USE_PROFILES_MUSIC    0x2   // == SL_PROFILES_MUSIC
     48 #define USE_PROFILES_GAME     0x4   // == SL_PROFILES_GAME
     49 // Pseudo profiles, used to decide whether to include code for incomplete or untested features
     50 // Features that are not in union of all profiles: audio recorder, LED, Vibra
     51 #define USE_PROFILES_OPTIONAL 0x8
     52 // Features that are in the intersection of all profiles:
     53 // object priorities, preemption, loss of control, device configuration
     54 #define USE_PROFILES_BASE     0x10
     55 
     56 #include "MPH.h"
     57 #include "MPH_to.h"
     58 #include "devices.h"
     59 #include "ut/OpenSLESUT.h"
     60 #include "ThreadPool.h"
     61 
     62 typedef struct CEngine_struct CEngine;
     63 typedef struct CAudioPlayer_struct CAudioPlayer;
     64 typedef struct CAudioRecorder_struct CAudioRecorder;
     65 typedef struct C3DGroup_struct C3DGroup;
     66 typedef struct COutputMix_struct COutputMix;
     67 
     68 #ifdef USE_SNDFILE
     69 #include <sndfile.h>
     70 #include "desktop/SLSndFile.h"
     71 #endif // USE_SNDFILE
     72 
     73 #ifdef USE_SDL
     74 #include <SDL/SDL_audio.h>
     75 #endif // USE_SDL
     76 
     77 #define STEREO_CHANNELS 2
     78 
     79 /**
     80  * Constants to define unknown property values
     81  */
     82 #define UNKNOWN_NUMCHANNELS 0
     83 #define UNKNOWN_SAMPLERATE  0
     84 #define UNKNOWN_CHANNELMASK 0
     85 
     86 #ifdef ANDROID
     87 #include <utils/Log.h>
     88 #include <utils/KeyedVector.h>
     89 #include "media/AudioSystem.h"
     90 #include "media/mediarecorder.h"
     91 #include "media/AudioRecord.h"
     92 #include "media/AudioTrack.h"
     93 #include "media/mediaplayer.h"
     94 #include <utils/String8.h>
     95 #define ANDROID_SL_MILLIBEL_MAX 0
     96 #include "android/android_sles_conversions.h"
     97 #include "android/android_defs.h"
     98 #endif
     99 
    100 #ifdef USE_OUTPUTMIXEXT
    101 #include "desktop/OutputMixExt.h"
    102 #endif
    103 
    104 #include "sllog.h"
    105 
    106 typedef enum {
    107     predestroy_error,   // Application should not be calling destroy now
    108     predestroy_ok,      // OK to destroy object now
    109     predestroy_again    // Application did nothing wrong, but should destroy again to be effective
    110 } predestroy_t;
    111 
    112 // Hook functions
    113 
    114 typedef void (*VoidHook)(void *self);
    115 //typedef SLresult (*ResultHook)(void *self);
    116 typedef SLresult (*AsyncHook)(void *self, SLboolean async);
    117 typedef bool (*BoolHook)(void *self);
    118 typedef predestroy_t (*PreDestroyHook)(void *self);
    119 
    120 // Describes how an interface is related to a given class, used in iid_vtable::mInterface
    121 
    122 #define INTERFACE_IMPLICIT            0 // no need for application to request prior to GetInterface
    123 #define INTERFACE_EXPLICIT            1 // must be requested explicitly during object creation
    124 #define INTERFACE_DYNAMIC             2 // can be requested after object creation
    125 #define INTERFACE_UNAVAILABLE         3 // this interface is not available on objects of this class
    126 #define INTERFACE_IMPLICIT_PREREALIZE 4 // implicit, and can call GetInterface before Realize
    127 #define INTERFACE_EXPLICIT_PREREALIZE 5 // explicit, and can call GetInterface before Realize
    128 // 6 and 7 are reserved for the meaningless DYNAMIC_PREREALIZE and UNAVAILABLE_PREREALIZE
    129 // note that INTERFACE_OPTIONAL is always re-mapped to one of the above
    130 #define INTERFACE_PREREALIZE          4 // bit-mask to test for calling GetInterface before Realize
    131 
    132 // Profile-specific interfaces
    133 
    134 #if USE_PROFILES & USE_PROFILES_BASE
    135 #define INTERFACE_IMPLICIT_BASE       INTERFACE_IMPLICIT
    136 #define INTERFACE_EXPLICIT_BASE       INTERFACE_EXPLICIT
    137 #else
    138 #define INTERFACE_IMPLICIT_BASE       INTERFACE_UNAVAILABLE
    139 #define INTERFACE_EXPLICIT_BASE       INTERFACE_UNAVAILABLE
    140 #endif
    141 
    142 #if USE_PROFILES & USE_PROFILES_GAME
    143 #define INTERFACE_DYNAMIC_GAME        INTERFACE_DYNAMIC
    144 #define INTERFACE_EXPLICIT_GAME       INTERFACE_EXPLICIT
    145 #else
    146 #define INTERFACE_DYNAMIC_GAME        INTERFACE_OPTIONAL
    147 #define INTERFACE_EXPLICIT_GAME       INTERFACE_OPTIONAL
    148 #endif
    149 
    150 #if USE_PROFILES & USE_PROFILES_MUSIC
    151 #define INTERFACE_DYNAMIC_MUSIC       INTERFACE_DYNAMIC
    152 #else
    153 #define INTERFACE_DYNAMIC_MUSIC       INTERFACE_OPTIONAL
    154 #endif
    155 
    156 #if USE_PROFILES & (USE_PROFILES_GAME | USE_PROFILES_MUSIC)
    157 #define INTERFACE_DYNAMIC_GAME_MUSIC  INTERFACE_DYNAMIC
    158 #define INTERFACE_EXPLICIT_GAME_MUSIC INTERFACE_EXPLICIT
    159 #else
    160 #define INTERFACE_DYNAMIC_GAME_MUSIC  INTERFACE_OPTIONAL
    161 #define INTERFACE_EXPLICIT_GAME_MUSIC INTERFACE_OPTIONAL
    162 #endif
    163 
    164 #if USE_PROFILES & (USE_PROFILES_GAME | USE_PROFILES_PHONE)
    165 #define INTERFACE_EXPLICIT_GAME_PHONE INTERFACE_EXPLICIT
    166 #else
    167 #define INTERFACE_EXPLICIT_GAME_PHONE INTERFACE_OPTIONAL
    168 #endif
    169 
    170 #if USE_PROFILES & USE_PROFILES_OPTIONAL
    171 #define INTERFACE_OPTIONAL            INTERFACE_EXPLICIT
    172 #define INTERFACE_DYNAMIC_OPTIONAL    INTERFACE_DYNAMIC
    173 #else
    174 #define INTERFACE_OPTIONAL            INTERFACE_UNAVAILABLE
    175 #define INTERFACE_DYNAMIC_OPTIONAL    INTERFACE_UNAVAILABLE
    176 #endif
    177 
    178 // Describes how an interface is related to a given object
    179 
    180 #define INTERFACE_UNINITIALIZED 0  ///< not available
    181 #define INTERFACE_INITIALIZED   1  ///< not requested at object creation time
    182 #define INTERFACE_EXPOSED       2  ///< requested at object creation time
    183 #define INTERFACE_ADDING_1      3  ///< part 1 of asynchronous AddInterface, pending
    184 #define INTERFACE_ADDING_2      4  ///< synchronous AddInterface, or part 2 of asynchronous
    185 #define INTERFACE_ADDED         5  ///< AddInterface has completed
    186 #define INTERFACE_REMOVING      6  ///< unlocked phase of (synchronous) RemoveInterface
    187 #define INTERFACE_SUSPENDING    7  ///< suspend in progress
    188 #define INTERFACE_SUSPENDED     8  ///< suspend has completed
    189 #define INTERFACE_RESUMING_1    9  ///< part 1 of asynchronous ResumeInterface, pending
    190 #define INTERFACE_RESUMING_2   10  ///< synchronous ResumeInterface, or part 2 of asynchronous
    191 #define INTERFACE_ADDING_1A    11  ///< part 1 of asynchronous AddInterface, aborted
    192 #define INTERFACE_RESUMING_1A  12  ///< part 1 of asynchronous ResumeInterface, aborted
    193 
    194 
    195 // Maps an interface ID to its offset within the class that exposes it
    196 
    197 struct iid_vtable {
    198     unsigned char mMPH;         // primary MPH for this interface, does not include any aliases
    199     unsigned char mInterface;   // relationship of interface to this class
    200     /*size_t*/ unsigned short mOffset;
    201 };
    202 
    203 // Per-class const data shared by all instances of the same class
    204 
    205 typedef struct {
    206     const struct iid_vtable *mInterfaces;   // maps interface index to info about that interface
    207     SLuint32 mInterfaceCount;  // number of possible interfaces
    208     const signed char *mMPH_to_index;
    209     const char * const mName;
    210     size_t mSize;
    211     // OpenSL ES and OpenMAX AL object IDs come from different ranges, and some objects such as
    212     // Engine, Output Mix, LED, and Vibra belong to both APIs, so we keep both object IDs
    213     SLuint16 mSLObjectID;   // OpenSL ES object ID
    214     XAuint16 mXAObjectID;   // OpenMAX AL object ID
    215     // hooks
    216     AsyncHook mRealize;     // called with mutex locked; can temporarily unlock mutex (for async)
    217     AsyncHook mResume;      // called with mutex locked; can temporarily unlock mutex (for async)
    218     VoidHook mDestroy;      // called with mutex locked and must keep mutex locked throughout
    219     PreDestroyHook mPreDestroy; // called with mutex locked; can temporarily unlock mutex (for wait)
    220 } ClassTable;
    221 
    222 // BufferHeader describes each element of a BufferQueue, other than the data
    223 typedef struct {
    224     const void *mBuffer;
    225     SLuint32 mSize;
    226 } BufferHeader;
    227 
    228 #ifdef ANDROID
    229 // Holds information about all commands that can be passed alongside an MPEG-2 TS buffer
    230 // Is used with buffers of type kAndroidBufferTypeMpeg2Ts
    231 typedef struct {
    232     SLuint32 mTsCmdCode;
    233     SLAuint64 mPts;
    234 } Mpeg2TsCommands;
    235 
    236 // Holds information about all commands that can be passed alongside an AAC ADTS buffer
    237 // Is used with buffers of type kAndroidBufferTypeAacadts
    238 typedef struct {
    239     SLuint32 mAdtsCmdCode;
    240 } AdtsCommands;
    241 
    242 // Union of the different structures to hold items stored in an AdvancedBufferHeader
    243 //   when an item comes from an AndroidBufferQueue as the data source, it's a command
    244 //   when an item is output to an AndroidBufferQueue as the data sink, it's a message (or metadata)
    245 typedef union {
    246     Mpeg2TsCommands mTsCmdData;
    247     AdtsCommands    mAdtsCmdData;
    248 } AdvancedBufferItems;
    249 
    250 // AdvancedBufferHeader describes each element of an AndroidBufferQueue, other than the data
    251 //  and associated messages
    252 typedef struct {
    253     const void *mDataBuffer;
    254     SLuint32 mDataSize;
    255     SLuint32 mDataSizeConsumed;
    256     AdvancedBufferItems mItems;
    257     const void *mBufferContext;
    258     SLuint32 mBufferState;
    259 } AdvancedBufferHeader;
    260 #endif
    261 
    262 #ifdef USE_SNDFILE
    263 
    264 #define SndFile_BUFSIZE 512     // in 16-bit samples
    265 #define SndFile_NUMBUFS 2
    266 
    267 struct SndFile {
    268     // save URI also?
    269     SLchar *mPathname;
    270     SNDFILE *mSNDFILE;
    271     SF_INFO mSfInfo;
    272     pthread_mutex_t mMutex; // protects mSNDFILE only
    273     SLboolean mEOF;         // sf_read returned zero sample frames
    274     SLuint32 mWhich;        // which buffer to use next
    275     short mBuffer[SndFile_BUFSIZE * SndFile_NUMBUFS];
    276 };
    277 
    278 #endif // USE_SNDFILE
    279 
    280 #include "data.h"
    281 #include "itfstruct.h"
    282 #include "classes.h"
    283 
    284 struct MPH_init {
    285     VoidHook mInit;     // called first to initialize the interface, right after object is allocated
    286     // Each interface is initialized regardless whether it is exposed to application.
    287     VoidHook mResume;   // called to resume interface after suspension, not currently used
    288     VoidHook mDeinit;   // called last when object is about to be destroyed
    289     BoolHook mExpose;   // called after initialization, only if interface is exposed to application
    290     VoidHook mRemove;   // called by DynamicInterfaceManager::RemoveInterface, and prior to mDeinit
    291     // will need a suspend hook when suspend is implemented
    292 };
    293 
    294 extern /*static*/ int IID_to_MPH(const SLInterfaceID iid);
    295 extern /*static*/ const struct MPH_init MPH_init_table[MPH_MAX];
    296 extern SLresult checkInterfaces(const ClassTable *clazz,
    297     SLuint32 numInterfaces, const SLInterfaceID *pInterfaceIds,
    298     const SLboolean *pInterfaceRequired, unsigned *pExposedMask, unsigned *pRequiredMask);
    299 extern IObject *construct(const ClassTable *clazz,
    300     unsigned exposedMask, SLEngineItf engine);
    301 extern const ClassTable *objectIDtoClass(SLuint32 objectID);
    302 extern const struct SLInterfaceID_ SL_IID_array[MPH_MAX];
    303 extern SLuint32 IObjectToObjectID(IObject *object);
    304 extern void IObject_Publish(IObject *thiz);
    305 extern void IObject_Destroy(SLObjectItf self);
    306 
    307 // Map an interface to it's "object ID" (which is really a class ID).
    308 // Note: this operation is undefined on IObject, as it lacks an mThis.
    309 // If you have an IObject, then use IObjectToObjectID directly.
    310 
    311 #define InterfaceToObjectID(thiz) IObjectToObjectID((thiz)->mThis)
    312 
    313 // Map an interface to it's corresponding IObject.
    314 // Note: this operation is undefined on IObject, as it lacks an mThis.
    315 // If you have an IObject, then you're done -- you already have what you need.
    316 
    317 #define InterfaceToIObject(thiz) ((thiz)->mThis)
    318 
    319 #define InterfaceToCAudioPlayer(thiz) (((CAudioPlayer*)InterfaceToIObject(thiz)))
    320 
    321 #define InterfaceToCAudioRecorder(thiz) (((CAudioRecorder*)InterfaceToIObject(thiz)))
    322 
    323 #define InterfaceToCAudioRecorder(thiz) (((CAudioRecorder*)InterfaceToIObject(thiz)))
    324 
    325 #define InterfaceToCMediaPlayer(thiz) (((CMediaPlayer*)InterfaceToIObject(thiz)))
    326 
    327 #ifdef ANDROID
    328 #include "android/MediaPlayer_to_android.h"
    329 #include "android/OutputMix_to_android.h"
    330 #include "android/AudioPlayer_to_android.h"
    331 #include "android/AudioRecorder_to_android.h"
    332 #endif
    333 
    334 extern predestroy_t C3DGroup_PreDestroy(void *self);
    335 
    336 extern SLresult CAudioPlayer_Realize(void *self, SLboolean async);
    337 extern SLresult CAudioPlayer_Resume(void *self, SLboolean async);
    338 extern void CAudioPlayer_Destroy(void *self);
    339 extern predestroy_t CAudioPlayer_PreDestroy(void *self);
    340 
    341 extern SLresult CAudioRecorder_Realize(void *self, SLboolean async);
    342 extern SLresult CAudioRecorder_Resume(void *self, SLboolean async);
    343 extern void CAudioRecorder_Destroy(void *self);
    344 extern predestroy_t CAudioRecorder_PreDestroy(void *self);
    345 
    346 extern SLresult CEngine_Realize(void *self, SLboolean async);
    347 extern SLresult CEngine_Resume(void *self, SLboolean async);
    348 extern void CEngine_Destroy(void *self);
    349 extern predestroy_t CEngine_PreDestroy(void *self);
    350 extern void CEngine_Destroyed(CEngine *self);
    351 
    352 extern SLresult COutputMix_Realize(void *self, SLboolean async);
    353 extern SLresult COutputMix_Resume(void *self, SLboolean async);
    354 extern void COutputMix_Destroy(void *self);
    355 extern predestroy_t COutputMix_PreDestroy(void *self);
    356 
    357 extern SLresult CMediaPlayer_Realize(void *self, SLboolean async);
    358 extern SLresult CMediaPlayer_Resume(void *self, SLboolean async);
    359 extern void CMediaPlayer_Destroy(void *self);
    360 extern predestroy_t CMediaPlayer_PreDestroy(void *self);
    361 
    362 #ifdef USE_SDL
    363 extern void SDL_open(IEngine *thisEngine);
    364 extern void SDL_close(void);
    365 #endif
    366 
    367 #define SL_OBJECT_STATE_REALIZING_1  ((SLuint32) 0x4) // async realize on work queue
    368 #define SL_OBJECT_STATE_REALIZING_2  ((SLuint32) 0x5) // sync realize, or async realize hook
    369 #define SL_OBJECT_STATE_RESUMING_1   ((SLuint32) 0x6) // async resume on work queue
    370 #define SL_OBJECT_STATE_RESUMING_2   ((SLuint32) 0x7) // sync resume, or async resume hook
    371 #define SL_OBJECT_STATE_SUSPENDING   ((SLuint32) 0x8) // suspend in progress
    372 #define SL_OBJECT_STATE_REALIZING_1A ((SLuint32) 0x9) // abort while async realize on work queue
    373 #define SL_OBJECT_STATE_RESUMING_1A  ((SLuint32) 0xA) // abort while async resume on work queue
    374 #define SL_OBJECT_STATE_DESTROYING   ((SLuint32) 0xB) // destroy object when no strong references
    375 
    376 #ifdef USE_OUTPUTMIXEXT
    377 #define SL_PLAYSTATE_STOPPING ((SLuint32) 0x4) // Play::Stop while PLAYING
    378 // If we needed it, could have PLAYING mean mixer is currently reading from front buffer,
    379 // while PLAYABLE would mean application requested PLAYING, but buffer queue is empty
    380 #endif
    381 
    382 #ifndef ANDROID
    383 extern void *sync_start(void *arg);
    384 #endif
    385 extern SLresult err_to_result(int err);
    386 
    387 #ifdef __GNUC__
    388 #define ctz __builtin_ctz
    389 #else
    390 extern unsigned ctz(unsigned);
    391 #endif
    392 extern const char * const interface_names[MPH_MAX];
    393 #include "platform.h"
    394 #include "attr.h"
    395 #include "handlers.h"
    396 #include "trace.h"
    397 
    398 #ifdef USE_SNDFILE
    399 extern void audioPlayerTransportUpdate(CAudioPlayer *audioPlayer);
    400 #endif
    401 
    402 extern SLresult IBufferQueue_Enqueue(SLBufferQueueItf self, const void *pBuffer, SLuint32 size);
    403 extern SLresult IBufferQueue_Clear(SLBufferQueueItf self);
    404 extern SLresult IBufferQueue_RegisterCallback(SLBufferQueueItf self,
    405     slBufferQueueCallback callback, void *pContext);
    406 
    407 extern bool IsInterfaceInitialized(IObject *thiz, unsigned MPH);
    408 extern SLresult AcquireStrongRef(IObject *object, SLuint32 expectedObjectID);
    409 extern void ReleaseStrongRef(IObject *object);
    410 extern void ReleaseStrongRefAndUnlockExclusive(IObject *object);
    411 
    412 extern COutputMix *CAudioPlayer_GetOutputMix(CAudioPlayer *audioPlayer);
    413 extern SLresult IEngineCapabilities_QueryLEDCapabilities(SLEngineCapabilitiesItf self,
    414     SLuint32 *pIndex, SLuint32 *pLEDDeviceID, SLLEDDescriptor *pDescriptor);
    415 extern SLresult IEngineCapabilities_QueryVibraCapabilities(SLEngineCapabilitiesItf self,
    416     SLuint32 *pIndex, SLuint32 *pVibraDeviceID, SLVibraDescriptor *pDescriptor);
    417 
    418 extern CEngine *theOneTrueEngine;
    419 extern pthread_mutex_t theOneTrueMutex;
    420 extern unsigned theOneTrueRefCount;
    421 
    422 extern LI_API SLresult liCreateEngine(SLObjectItf *pEngine, SLuint32 numOptions,
    423     const SLEngineOption *pEngineOptions, SLuint32 numInterfaces,
    424     const SLInterfaceID *pInterfaceIds, const SLboolean *pInterfaceRequired,
    425     const ClassTable *pCEngine_class);
    426 extern LI_API SLresult liQueryNumSupportedInterfaces(SLuint32 *pNumSupportedInterfaces,
    427         const ClassTable *clazz);
    428 extern LI_API SLresult liQuerySupportedInterfaces(SLuint32 index, SLInterfaceID *pInterfaceId,
    429         const ClassTable *clazz);
    430 
    431 // The EnqueueAsyncCallback macros provide a safe way to asynchronously call an application-level
    432 // callback handler that is permitted to do almost anything, including block.  This is intended
    433 // primarily for "notification" callbacks such as play head progress.  Do not use for callbacks
    434 // which must be synchronous, such as buffer queue completions.  The enqueue may fail if
    435 // the callback queue is full.  This almost always indicates an application error such as blocking
    436 // for an excessive time within a callback handler or requesting too frequent callbacks.  The
    437 // recommended recovery is to either retry later, or log a warning or error as appropriate.
    438 // If the callback absolutely must be called, then you should be calling it directly instead.
    439 // Example usage:
    440 //  CAudioPlayer *ap;
    441 //  SLresult result = EnqueueAsyncCallback_ppi(ap, playCallback, &ap->mPlay.mItf, playContext,
    442 //       SL_PLAYEVENT_HEADATEND);
    443 //  if (SL_RESULT_SUCCESS != result) {
    444 //    LOGW("Callback %p(%p, %p, SL_PLAYEVENT_HEADATEND) dropped", playCallback, &ap->mPlay.mItf,
    445 //        playContext);
    446 //  }
    447 // which replaces:
    448 //  (*playCallback)(&ap->mPlay.mItf, playContext, SL_PLAYEVENT_HEADATEND);
    449 #define EnqueueAsyncCallback_ppi(object, handler, p1, p2, i1) \
    450         ThreadPool_add_ppi(&(object)->mObject.mEngine->mThreadPool, \
    451             (ClosureHandler_ppi) (handler), (p1), (p2), (i1))
    452 #define EnqueueAsyncCallback_ppii(object, handler, p1, p2, i1, i2) \
    453         ThreadPool_add_ppii(&(object)->mObject.mEngine->mThreadPool, \
    454             (ClosureHandler_ppii) (handler), (p1), (p2), (i1), (i2))
    455 #define EnqueueAsyncCallback_piipp(object, handler, p1, i1, i2, p2, p3) \
    456         ThreadPool_add_piipp(&(object)->mObject.mEngine->mThreadPool, \
    457             (ClosureHandler_piipp) (handler), (p1), (i1), (i2), (p2), (p3))
    458 
    459 #define SL_PREFETCHEVENT_NONE ((SLuint32) 0)    // placeholder for non-existent SL_PREFETCHEVENT_*
    460