_ak_music_engine_8h

Wwise SDK 2021.1.14

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 The content of this file includes portions of the AUDIOKINETIC Wwise Technology

 released in source code form as part of the SDK installer package.

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 may use this file in accordance with the end user license agreement provided 

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 Alternatively, this file may be used under the Apache License, Version 2.0 (the 

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   Version: v2021.1.14  Build: 6590

   Copyright (c) 2006-2023 Audiokinetic Inc.

 *******************************************************************************/

 // AkMusicEngine.h

 /// \file 

 /// The main music engine interface.

 #ifndef _AK_MUSICENGINE_H_

 #define _AK_MUSICENGINE_H_

 #include <AK/SoundEngine/Common/AkSoundEngineExport.h>

 #include <AK/SoundEngine/Common/AkTypes.h>

 #include <AK/SoundEngine/Common/AkCallback.h>

 /// Platform-independent initialization settings of the music engine

 /// \sa 

 /// - AK::MusicEngine::Init()

 /// - \ref soundengine_integration_init_advanced

 struct AkMusicSettings

 {

     AkReal32 fStreamingLookAheadRatio;  ///< Multiplication factor for all streaming look-ahead heuristic values.

 };

 // Audiokinetic namespace

 namespace AK

 {

     /// Music engine namespace

     /// \akwarning

     /// The functions in this namespace are not thread-safe, unless stated otherwise.

     /// \endakwarning

     namespace MusicEngine

     {

         ///////////////////////////////////////////////////////////////////////

         /// @name Initialization

         //@{

         /// Initialize the music engine.

         /// \warning This function must be called after the base sound engine has been properly initialized. 

         /// There should be no AK API call between AK::SoundEngine::Init() and this call. Any call done in between is potentially unsafe.

         /// \return AK_Success if the Init was successful, AK_Fail otherwise.

         /// \sa

         /// - \ref workingwithsdks_initialization

         AK_EXTERNAPIFUNC( AKRESULT, Init )(

             AkMusicSettings *   in_pSettings    ///< Initialization settings (can be NULL, to use the default values)

             );

         /// Get the music engine's default initialization settings values

         /// \sa

         /// - \ref soundengine_integration_init_advanced

         /// - AK::MusicEngine::Init()

         AK_EXTERNAPIFUNC( void, GetDefaultInitSettings )(

             AkMusicSettings &   out_settings    ///< Returned default platform-independent music engine settings

             );

         /// Terminate the music engine.

         /// \warning This function must be called before calling Term() on the base sound engine.

         /// \sa

         /// - \ref workingwithsdks_termination

         AK_EXTERNAPIFUNC( void, Term )(

             );

         /// Query information on the active segment of a music object that is playing. Use the playing ID 

         /// that was returned from AK::SoundEngine::PostEvent(), provided that the event contained a play

         /// action that was targetting a music object. For any configuration of interactive music hierarchy, 

         /// there is only one segment that is active at a time. 

         /// To be able to query segment information, you must pass the AK_EnableGetMusicPlayPosition flag 

         /// to the AK::SoundEngine::PostEvent() method. This informs the sound engine that the source associated 

         /// with this event should be given special consideration because GetPlayingSegmentInfo() can be called 

         /// at any time for this AkPlayingID.

         /// Notes:

         /// - If the music object is a single segment, you will get negative values for AkSegmentInfo::iCurrentPosition

         ///     during the pre-entry. This will never occur with other types of music objects because the 

         ///     pre-entry of a segment always overlaps another active segment.

         /// - The active segment during the pre-entry of the first segment of a Playlist Container or a Music Switch 

         ///     Container is "nothing", as well as during the post-exit of the last segment of a Playlist (and beyond).

         /// - When the active segment is "nothing", out_uSegmentInfo is filled with zeros.

         /// - If in_bExtrapolate is true (default), AkSegmentInfo::iCurrentPosition is corrected by the amount of time elapsed

         ///     since the beginning of the audio frame. It is thus possible that it slightly overshoots the total segment length.

         /// \return AK_Success if there is a playing music structure associated with the specified playing ID.

         /// \sa

         /// - AK::SoundEngine::PostEvent

         /// - AkSegmentInfo

         AK_EXTERNAPIFUNC( AKRESULT, GetPlayingSegmentInfo )(

             AkPlayingID     in_PlayingID,           ///< Playing ID returned by AK::SoundEngine::PostEvent().

             AkSegmentInfo & out_segmentInfo,        ///< Structure containing information about the active segment of the music structure that is playing.

             bool            in_bExtrapolate = true  ///< Position is extrapolated based on time elapsed since last sound engine update.

             );

         //@}

     }

 }

 #endif // _AK_MUSICENGINE_H_