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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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  Copyright (c) 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_