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00003 released in source code form as part of the SDK installer package.
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00005 Commercial License Usage
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00012 Apache License Usage
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00014 Alternatively, this file may be used under the Apache License, Version 2.0 (the 
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00027 
00028 // AkCallback.h
00029 
00030 /// \file 
00031 /// Declaration of callback prototypes
00032 
00033 
00034 #ifndef _AK_CALLBACK_H_
00035 #define _AK_CALLBACK_H_
00036 
00037 #include <AK/SoundEngine/Common/AkCommonDefs.h>
00038 #include <AK/SoundEngine/Common/AkMidiTypes.h>
00039 
00040 namespace AK
00041 {
00042     class IAkGlobalPluginContext;
00043     class IAkMixerInputContext;
00044     class IAkMixerPluginContext;
00045 }
00046 
00047 /// Type of callback. Used as a bitfield in methods AK::SoundEngine::PostEvent() and AK::SoundEngine::DynamicSequence::Open().
00048 enum AkCallbackType
00049 {
00050     AK_EndOfEvent                   = 0x0001,   ///< Callback triggered when reaching the end of an event. AkCallbackInfo can be cast to AkEventCallbackInfo.
00051     AK_EndOfDynamicSequenceItem     = 0x0002,   ///< Callback triggered when reaching the end of a dynamic sequence item. AkCallbackInfo can be cast to AkDynamicSequenceItemCallbackInfo.
00052     AK_Marker                       = 0x0004,   ///< Callback triggered when encountering a marker during playback. AkCallbackInfo can be cast to AkMarkerCallbackInfo.
00053     AK_Duration                     = 0x0008,   ///< Callback triggered when the duration of the sound is known by the sound engine. AkCallbackInfo can be cast to AkDurationCallbackInfo.
00054 
00055     AK_SpeakerVolumeMatrix          = 0x0010,   ///< Callback triggered at each frame, letting the client modify the speaker volume matrix. AkCallbackInfo can be cast to AkSpeakerVolumeMatrixCallbackInfo.
00056 
00057     AK_Starvation                   = 0x0020,   ///< Callback triggered when playback skips a frame due to stream starvation. AkCallbackInfo can be cast to AkEventCallbackInfo.
00058 
00059     AK_MusicPlaylistSelect          = 0x0040,   ///< Callback triggered when music playlist container must select the next item to play. AkCallbackInfo can be cast to AkMusicPlaylistCallbackInfo.
00060     AK_MusicPlayStarted             = 0x0080,   ///< Callback triggered when a "Play" or "Seek" command has been executed ("Seek" commands are issued from AK::SoundEngine::SeekOnEvent()). Applies to objects of the Interactive-Music Hierarchy only. AkCallbackInfo can be cast to AkEventCallbackInfo.
00061 
00062     AK_MusicSyncBeat                = 0x0100,   ///< Enable notifications on Music Beat. AkCallbackInfo can be cast to AkMusicSyncCallbackInfo.
00063     AK_MusicSyncBar                 = 0x0200,   ///< Enable notifications on Music Bar. AkCallbackInfo can be cast to AkMusicSyncCallbackInfo.
00064     AK_MusicSyncEntry               = 0x0400,   ///< Enable notifications on Music Entry Cue. AkCallbackInfo can be cast to AkMusicSyncCallbackInfo.
00065     AK_MusicSyncExit                = 0x0800,   ///< Enable notifications on Music Exit Cue. AkCallbackInfo can be cast to AkMusicSyncCallbackInfo.
00066     AK_MusicSyncGrid                = 0x1000,   ///< Enable notifications on Music Grid. AkCallbackInfo can be cast to AkMusicSyncCallbackInfo.
00067     AK_MusicSyncUserCue             = 0x2000,   ///< Enable notifications on Music Custom Cue. AkCallbackInfo can be cast to AkMusicSyncCallbackInfo.
00068     AK_MusicSyncPoint               = 0x4000,   ///< Enable notifications on Music switch transition synchronization point. AkCallbackInfo can be cast to AkMusicSyncCallbackInfo.
00069     AK_MusicSyncAll                 = 0x7f00,   ///< Use this flag if you want to receive all notifications concerning AK_MusicSync registration.
00070 
00071     AK_MIDIEvent                    = 0x10000,  ///< Enable notifications for MIDI events. AkCallbackInfo can be cast to AkMIDIEventCallbackInfo.
00072 
00073     AK_CallbackBits                 = 0xfffff,  ///< Bitmask for all callback types.
00074 
00075     // Not callback types, but need to be part of same bitfield for AK::SoundEngine::PostEvent().
00076     AK_EnableGetSourcePlayPosition  = 0x100000, ///< Enable play position information for use by AK::SoundEngine::GetSourcePlayPosition().
00077     AK_EnableGetMusicPlayPosition   = 0x200000, ///< Enable play position information of music objects, queried via AK::MusicEngine::GetPlayingSegmentInfo().
00078     AK_EnableGetSourceStreamBuffering = 0x400000    ///< Enable stream buffering information for use by AK::SoundEngine::GetSourceStreamBuffering(). 
00079 };
00080 
00081 /// Callback information structure used as base for all notifications handled by \ref AkCallbackFunc.
00082 /// \sa 
00083 /// - AK::SoundEngine::PostEvent()
00084 /// - \ref soundengine_events
00085 struct AkCallbackInfo
00086 {
00087     void *          pCookie;        ///< User data, passed to PostEvent()
00088     AkGameObjectID  gameObjID;      ///< Game object ID
00089 };
00090 
00091 /// Callback information structure corresponding to \ref AK_EndOfEvent, \ref AK_MusicPlayStarted and \ref AK_Starvation.
00092 /// \sa 
00093 /// - AK::SoundEngine::PostEvent()
00094 /// - \ref soundengine_events
00095 struct AkEventCallbackInfo : public AkCallbackInfo
00096 {
00097     AkPlayingID     playingID;      ///< Playing ID of Event, returned by PostEvent()
00098     AkUniqueID      eventID;        ///< Unique ID of Event, passed to PostEvent()
00099 };
00100 
00101 /// Callback information structure corresponding to \ref AK_MidiEvent
00102 /// \sa 
00103 /// - AK::SoundEngine::PostEvent()
00104 /// - \ref soundengine_events
00105 struct AkMIDIEventCallbackInfo : public AkEventCallbackInfo
00106 {
00107     AkMIDIEvent     midiEvent;      ///< MIDI event triggered by event.
00108 };
00109 
00110 
00111 /// Callback information structure corresponding to \ref AK_Marker.
00112 /// \sa 
00113 /// - AK::SoundEngine::PostEvent()
00114 /// - \ref soundengine_events
00115 /// - \ref soundengine_markers
00116 struct AkMarkerCallbackInfo : public AkEventCallbackInfo
00117 {
00118     AkUInt32    uIdentifier;        ///< Cue point identifier
00119     AkUInt32    uPosition;          ///< Position in the cue point (unit: sample frames)
00120     const char* strLabel;           ///< Label of the marker, read from the file
00121 };
00122 
00123 /// Callback information structure corresponding to \ref AK_Duration.
00124 /// \sa 
00125 /// - AK::SoundEngine::PostEvent()
00126 /// - \ref soundengine_events
00127 struct AkDurationCallbackInfo : public AkEventCallbackInfo
00128 {
00129     AkReal32    fDuration;              ///< Duration of the sound (unit: milliseconds)
00130     AkReal32    fEstimatedDuration;     ///< Estimated duration of the sound depending on source settings such as pitch. (unit: milliseconds)
00131     AkUniqueID  audioNodeID;            ///< Audio Node ID of playing item
00132     AkUniqueID  mediaID;                ///< Media ID of playing item. (corresponds to 'ID' attribute of 'File' element in SoundBank metadata file)
00133     bool        bStreaming;             ///< True if source is streaming, false otherwise.
00134 };
00135 
00136 /// Callback information structure corresponding to \ref AK_EndOfDynamicSequenceItem.
00137 /// \sa 
00138 /// - AK::SoundEngine::PostEvent()
00139 /// - AK::SoundEngine::DynamicSequence::Open()
00140 /// - \ref soundengine_events
00141 struct AkDynamicSequenceItemCallbackInfo : public AkCallbackInfo
00142 {
00143     AkPlayingID playingID;          ///< Playing ID of Dynamic Sequence, returned by AK::SoundEngine:DynamicSequence::Open()
00144     AkUniqueID  audioNodeID;        ///< Audio Node ID of finished item
00145     void*       pCustomInfo;        ///< Custom info passed to the DynamicSequence::Open function
00146 };
00147 
00148 /// Callback information structure corresponding to \ref AK_SpeakerVolumeMatrix, and passed to callbacks registered in RegisterBusVolumeCallback()
00149 /// or PostEvent() with AK_SpeakerVolumeMatrix. These callbacks are called at every audio frame for every connection from an input (voice
00150 /// or bus) to an output bus (standard or auxiliary), at the point when an input signal is about to be mixed into a mixing bus, but just before 
00151 /// having been scaled in accordance to volumes authored in Wwise. The volumes are passed via this structure as pointers because they can be modified
00152 /// in the callbacks. They are factored into two linear values ([0..1]): a common base value (pfBaseVolume), that is channel-agnostic and represents 
00153 /// the collapsed gain of all volume changes in Wwise (sliders, actions, RTPC, attenuations, ...), and a matrix of gains per input/output channel, 
00154 /// which depends on spatialization. Use the methods of AK::SpeakerVolumes::Matrix, defined in AkCommonDefs.h, to perform operations on them. 
00155 /// Access each input channel of the volumes matrix with AK::SpeakerVolumes::Matrix::GetChannel(), passing it the input and output channel configuration.
00156 /// Then, you may access each element of the output vector using the standard bracket [] operator. See AK::SpeakerVolumes for more details.
00157 /// It is crucial that the processing done in the callback be lightweight and non-blocking.
00158 /// \sa 
00159 /// - \ref goingfurther_speakermatrixcallback
00160 /// - AK::SoundEngine::PostEvent()
00161 /// - \ref soundengine_events
00162 /// - AK::SoundEngine::RegisterBusVolumeCallback()
00163 struct AkSpeakerVolumeMatrixCallbackInfo : public AkEventCallbackInfo
00164 {
00165     AK::SpeakerVolumes::MatrixPtr pVolumes;     ///< Pointer to volume matrix describing the contribution of each source channel to destination channels. Use methods of AK::SpeakerVolumes::Matrix to interpret them. 
00166     AkChannelConfig inputConfig;                ///< Channel configuration of the voice/bus.
00167     AkChannelConfig outputConfig;               ///< Channel configuration of the output bus.
00168     AkReal32 * pfBaseVolume;                    ///< Base volume, common to all channels.
00169     AkReal32 * pfEmitterListenerVolume;         ///< Emitter-listener pair-specific gain. When there are multiple emitter-listener pairs, this volume equals 1, and pair gains are applied directly on the channel volume matrix pVolumes.
00170     AK::IAkMixerInputContext * pContext;        ///< Context of the current voice/bus about to be mixed into the output bus with specified base volume and volume matrix.
00171     AK::IAkMixerPluginContext * pMixerContext;  ///< Output mixing bus context. Use it to access a few useful panning and mixing services, as well as the ID of the output bus. NULL if pContext is the master audio bus.
00172 };
00173 
00174 /// Callback information structure corresponding to \ref AK_MusicPlaylistSelect.
00175 /// Called when a music playlist container must select its next item to play.
00176 /// The members uPlaylistSelection and uPlaylistItemDone are set by the sound
00177 /// engine before the callback function call.  They are set to the next item
00178 /// selected by the sound engine.  They are to be modified by the callback
00179 /// function if the selection is to be changed.
00180 /// \sa 
00181 /// - \ref soundengine_events
00182 /// - AK::SoundEngine::PostEvent()
00183 /// - \ref soundengine_music_callbacks
00184 struct AkMusicPlaylistCallbackInfo : public AkEventCallbackInfo
00185 {
00186     AkUniqueID playlistID;          ///< ID of playlist node
00187     AkUInt32 uNumPlaylistItems;     ///< Number of items in playlist node (may be segments or other playlists)
00188     AkUInt32 uPlaylistSelection;    ///< Selection: set by sound engine, modified by callback function (if not in range 0 <= uPlaylistSelection < uNumPlaylistItems then ignored).
00189     AkUInt32 uPlaylistItemDone;     ///< Playlist node done: set by sound engine, modified by callback function (if set to anything but 0 then the current playlist item is done, and uPlaylistSelection is ignored)
00190 };
00191 
00192 /// Structure used to query info on active playing segments.
00193 struct AkSegmentInfo
00194 {
00195     AkTimeMs        iCurrentPosition;       ///< Current position of the segment, relative to the Entry Cue, in milliseconds. Range is [-iPreEntryDuration, iActiveDuration+iPostExitDuration].
00196     AkTimeMs        iPreEntryDuration;      ///< Duration of the pre-entry region of the segment, in milliseconds.
00197     AkTimeMs        iActiveDuration;        ///< Duration of the active region of the segment (between the Entry and Exit Cues), in milliseconds.
00198     AkTimeMs        iPostExitDuration;      ///< Duration of the post-exit region of the segment, in milliseconds.
00199     AkTimeMs        iRemainingLookAheadTime;///< Number of milliseconds remaining in the "looking-ahead" state of the segment, when it is silent but streamed tracks are being prefetched.
00200     AkReal32        fBeatDuration;          ///< Beat Duration in seconds.
00201     AkReal32        fBarDuration;           ///< Bar Duration in seconds.
00202     AkReal32        fGridDuration;          ///< Grid duration in seconds.
00203     AkReal32        fGridOffset;            ///< Grid offset in seconds.
00204 };
00205 
00206 /// Callback information structure corresponding to \ref AK_MusicSyncEntry, \ref AK_MusicSyncBeat, \ref AK_MusicSyncBar, \ref AK_MusicSyncExit, \ref AK_MusicSyncGrid, \ref AK_MusicSyncPoint and \ref AK_MusicSyncUserCue.
00207 /// If you need the Tempo, you can compute it using the fBeatDuration
00208 /// Tempo (beats per minute) = 60/fBeatDuration
00209 /// \sa 
00210 /// - \ref soundengine_events
00211 /// - AK::SoundEngine::PostEvent()
00212 /// - \ref soundengine_music_callbacks
00213 struct AkMusicSyncCallbackInfo : public AkCallbackInfo
00214 {
00215     AkPlayingID playingID;          ///< Playing ID of Event, returned by PostEvent()
00216     AkSegmentInfo segmentInfo;      ///< Segment information corresponding to the segment triggering this callback.
00217     AkCallbackType musicSyncType;   ///< Would be either \ref AK_MusicSyncEntry, \ref AK_MusicSyncBeat, \ref AK_MusicSyncBar, \ref AK_MusicSyncExit, \ref AK_MusicSyncGrid, \ref AK_MusicSyncPoint or \ref AK_MusicSyncUserCue.
00218     char *   pszUserCueName;        ///< Cue name (UTF-8 string). Set for notifications AK_MusicSyncUserCue. NULL if cue has no name.
00219 };
00220 
00221 /// Function called on completion of an event, or when a marker is reached.
00222 /// \param in_eType Type of callback.
00223 /// \param in_pCallbackInfo Pointer to structure containing callback information. This pointer is invalidated as soon as the callback function returns.
00224 /// \remarks An event is considered completed once all of its actions have been executed and all the playbacks in this events are terminated.
00225 /// \remarks This callback is executed from the audio processing thread. The processing time in the callback function should be minimal. Having too much processing time could result in slowing down the audio processing.
00226 /// \remarks Before waiting on an \ref AK_EndOfEvent, make sure that the event is going to end. 
00227 /// Some events can be continuously playing or infinitely looping, and the callback will not occur unless a specific stop event is sent to terminate the event.
00228 /// \sa 
00229 /// - AK::SoundEngine::PostEvent()
00230 /// - AK::SoundEngine::DynamicSequence::Open()
00231 /// - \ref soundengine_events
00232 /// - \ref soundengine_markers
00233 /// - \ref soundengine_music_callbacks
00234 AK_CALLBACK( void, AkCallbackFunc )( 
00235     AkCallbackType in_eType,                            ///< Callback type.
00236     AkCallbackInfo* in_pCallbackInfo                    ///< Structure containing desired information. You can cast it to the proper sub-type, depending on the callback type.
00237     );
00238 
00239 /// Function called on at every audio frame for the specified registered busses.
00240 /// \sa 
00241 /// - AkSpeakerVolumeMatrixCallbackInfo
00242 /// - AK::SoundEngine::RegisterBusVolumeCallback()
00243 /// - \ref goingfurther_speakermatrixcallback
00244 AK_CALLBACK( void, AkBusCallbackFunc )( 
00245     AkSpeakerVolumeMatrixCallbackInfo* in_pCallbackInfo ///< Structure containing desired bus information. 
00246     );
00247 
00248 /// Function called on at every audio frame for the specified registered busses, just after metering has been computed.
00249 /// \sa 
00250 /// - AK::SoundEngine::RegisterBusMeteringCallback()
00251 /// - AK::IAkMetering
00252 /// - \ref goingfurther_speakermatrixcallback
00253 AK_CALLBACK( void, AkBusMeteringCallbackFunc )( 
00254     AK::IAkMetering * in_pMetering,                     ///< AK::IAkMetering interface for retrieving metering information.
00255     AkChannelConfig in_channelConfig,                   ///< Channel configuration of the bus.
00256     AkMeteringFlags in_eMeteringFlags                   ///< Metering flags that were asked for in RegisterBusMeteringCallback(). You may only access corresponding meter values from in_pMeteringInfo. Others will fail.
00257     );
00258 
00259 /// Callback prototype used with asynchronous bank load/unload requests.
00260 /// This function is called when the bank request has been processed 
00261 /// and indicates if it was successfully executed or if an error occurred.
00262 /// \param in_bankID Identifier of the bank that was explicitly loaded/unloaded. 
00263 /// In the case of PrepareEvent() or PrepareGameSyncs(), this value contains 
00264 /// the AkUniqueID of the event/game sync that was prepared/unprepared, if the array contained only
00265 /// one element. Otherwise, in_bankID equals AK_INVALID_UNIQUE_ID.
00266 /// \param in_pInMemoryBankPtr Value returned when the unloaded bank was loaded using an in memory location
00267 /// \param in_eLoadResult Result of the requested action.
00268 /// - AK_Success: Load or unload successful.
00269 /// - AK_IDNotFound: At least one of the event/game sync identifiers passed to PrepareEvent() or PrepareGameSyncs() does not exist.
00270 /// - AK_InsufficientMemory: Insufficient memory to store bank data.
00271 /// - AK_BankReadError: I/O error.
00272 /// - AK_WrongBankVersion: Invalid bank version: make sure the version of Wwise that 
00273 /// you used to generate the SoundBanks matches that of the SDK you are currently using.
00274 /// - AK_InvalidFile: File specified could not be opened.
00275 /// - AK_InvalidParameter: Invalid parameter.
00276 /// - AK_Fail: Load or unload failed for any other reason. (Most likely small allocation failure)
00277 /// \param in_memPoolId ID of the memory pool in which the bank was explicitly loaded/unloaded. 
00278 /// AK_DEFAULT_POOL_ID is returned whenever this callback is issued from an implicit bank load (PrepareEvent(), PrepareGameSyncs()), 
00279 /// the bank memory was managed internally, or an error occurred.
00280 /// \param in_pCookie Optional cookie that was passed to the bank request.
00281 /// \remarks This callback is executed from the bank thread. The processing time in the callback function should be minimal. Having too much processing time could slow down the bank loading process.
00282 /// \sa 
00283 /// - AK::SoundEngine::LoadBank()
00284 /// - AK::SoundEngine::UnloadBank()
00285 /// - AK::SoundEngine::PrepareEvent()
00286 /// - AK::SoundEngine::PrepareGameSyncs()
00287 /// - \ref soundengine_banks
00288 AK_CALLBACK( void, AkBankCallbackFunc )(
00289     AkUInt32        in_bankID,
00290     const void *    in_pInMemoryBankPtr,
00291     AKRESULT        in_eLoadResult,
00292     AkMemPoolId     in_memPoolId,
00293     void *          in_pCookie
00294     );
00295 
00296 /// Bit field of various locations in the audio processing loop where the game can be called back.
00297 enum AkGlobalCallbackLocation
00298 {
00299     AkGlobalCallbackLocation_Register = (1 << 0),   ///< Right after successful registration of callback/plugin. Typically used by plugins along with AkGlobalCallbackLocation_Term for allocating memory for the lifetime of the sound engine.
00300 
00301     AkGlobalCallbackLocation_Begin = (1 << 1),  ///< Start of audio processing. The number of frames about to be rendered depends on the sink/end-point and can be zero.
00302 
00303         AkGlobalCallbackLocation_PreProcessMessageQueueForRender = (1 << 2),    ///< Start of frame rendering, before having processed game messages.
00304         AkGlobalCallbackLocation_PostMessagesProcessed = (1 << 3),              ///< After one or more messages have been processed, but before updating game object and listener positions internally.
00305         AkGlobalCallbackLocation_BeginRender = (1 << 4),    ///< Start of frame rendering, after having processed game messages.
00306         AkGlobalCallbackLocation_EndRender = (1 << 5),      ///< End of frame rendering.
00307 
00308     AkGlobalCallbackLocation_End = (1 << 6),        ///< End of audio processing.
00309 
00310     AkGlobalCallbackLocation_Term = (1 << 7),       ///< Sound engine termination.
00311 
00312     AkGlobalCallbackLocation_Monitor = (1 << 8), /// Send monitor data
00313 
00314     // IMPORTANT: Keep in sync with number of locations.
00315     AkGlobalCallbackLocation_Num = 9                ///< Total number of global callback locations.
00316 };
00317 
00318 /// Callback prototype used for global callback registration.
00319 /// This callback may be called from various locations within the audio processing loop. The exact location from which it is called is passed in in_eLocation, and corresponds to one of the values
00320 /// that were passed to RegisterGlobalCallback(). See the possible values of AkGlobalCallbackLocation for more details about the available locations.
00321 /// \remarks This callback is normally executed from the main audio thread. The processing time in the callback function should be minimal. Having too much processing time could cause voice starvation.
00322 /// \sa
00323 /// - AK::SoundEngine::RegisterGlobalCallback()
00324 /// - AK::SoundEngine::UnregisterGlobalCallback()
00325 AK_CALLBACK( void, AkGlobalCallbackFunc )(
00326     AK::IAkGlobalPluginContext * in_pContext,   ///< Engine context.
00327     AkGlobalCallbackLocation in_eLocation,      ///< Location where this callback is fired.
00328     void * in_pCookie                           ///< User cookie passed to AK::SoundEngine::RegisterGlobalCallback().
00329     );
00330 
00331 namespace AK
00332 {
00333     enum AkAudioDeviceEvent 
00334     { 
00335         AkAudioDeviceEvent_Initialization,              ///< Sent after an Audio Device has initialized.  Initialization might have failed, check the AKRESULT.
00336         AkAudioDeviceEvent_Removal,                     ///< Audio device was removed through explicit call (AK::SoundEngine::RemoveOutput or AK::SoundEngine::Term)
00337         AkAudioDeviceEvent_SystemRemoval                ///< Audio device was removed because of a system event (disconnection), hardware or driver problem. Check the AKRESULT when called through AkDeviceStatusCallbackFunc, it may give more context.
00338     };
00339 
00340     /// Callback for Audio Device status changes.
00341     AK_CALLBACK(void, AkDeviceStatusCallbackFunc)(
00342         AK::IAkGlobalPluginContext * in_pContext,   ///< Engine context.
00343         AkUniqueID in_idAudioDeviceShareset,        ///< The audio device shareset attached, as passed to AK::SoundEngine::AddOutput or AK::SoundEngine::Init
00344         AkUInt32 in_idDeviceID,                     ///< The audio device specific id, as passed to AK::SoundEngine::AddOutput or AK::SoundEngine::Init
00345         AkAudioDeviceEvent in_idEvent,              ///< The event for which this callback was called.  See AK::AkAudioDeviceEvent.  AKRESULT may provide more information.
00346         AKRESULT in_AkResult                        ///< Result of the last operation.
00347         );
00348 }
00349 
00350 #endif // _AK_CALLBACK_H_
00351