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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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  Copyright (c) 2023 Audiokinetic Inc.
*******************************************************************************/

// AkAndroidSoundEngine.h

/// \file 
/// Main Sound Engine interface, specific Android.

#pragma once

#include <AK/SoundEngine/Common/AkTypes.h>
#include <AK/Tools/Common/AkPlatformFuncs.h>
#include <SLES/OpenSLES.h>
#include "SLES/OpenSLES_Android.h"
#include <jni.h>

///< API used for audio output
///< Use with AkPlatformInitSettings to select the API used for audio output.  
///< Use AkAPI_Default, it will select the more appropriate API depending on the computer's capabilities.  Other values should be used for testing purposes.
///< \sa AK::SoundEngine::Init
typedef enum AkAudioAPIAndroid
{
	AkAudioAPI_AAudio    = 1 << 0,                                 ///< Use AAudio (lower latency, available only for Android 8.1 or above) 
	AkAudioAPI_OpenSL_ES = 1 << 1,                                 ///< Use OpenSL ES (older API, compatible with all Android devices)
	AkAudioAPI_Default = AkAudioAPI_AAudio | AkAudioAPI_OpenSL_ES, ///< Default value, will select the more appropriate API (AAudio for compatible devices, OpenSL for others)	
} AkAudioAPI;

/// Platform specific initialization settings
/// \sa AK::SoundEngine::Init
/// \sa AK::SoundEngine::GetDefaultPlatformInitSettings
struct AkPlatformInitSettings
{
	// Threading model.
    AkThreadProperties  threadLEngine;			///< Lower engine threading properties
	AkThreadProperties  threadOutputMgr;		///< Ouput thread threading properties
	AkThreadProperties  threadBankManager;		///< Bank manager threading properties (its default priority is AK_THREAD_PRIORITY_NORMAL)
	AkThreadProperties  threadMonitor;			///< Monitor threading properties (its default priority is AK_THREAD_PRIORITY_ABOVENORMAL). This parameter is not used in Release build.	

	AkAudioAPI          eAudioAPI;  ///< Main audio API to use. Leave to AkAPI_Default for the default sink (default value).
	                                ///< \ref AkAudioAPI

	AkUInt32			uSampleRate;			///< Sampling Rate.  Set to 0 to get the native sample rate.  Default value is 0.
	AkUInt16            uNumRefillsInVoice;		///< Number of refill buffers in voice buffer.  Defaults to 4.	
	bool				bRoundFrameSizeToHWSize;///< Used when hardware-preferred frame size and user-preferred frame size (AkInitSettings.uNumSamplesPerFrame) are not compatible.  
												/// If true (default) the sound engine will initialize to a multiple of the HW setting, close to the user setting.
												/// If false, the user setting is used as is, regardless of the HW preference (might incur a performance hit).

	SLObjectItf			pSLEngine;				///< OpenSL engine reference for sharing between various audio components.
	JavaVM*				pJavaVM;				///< Active JavaVM for the app, used for internal system calls.  Usually provided through the android_app structure given at startup or the NativeActivity. This parameter needs to be set to allow the sound engine initialization.
	jobject				jActivity;				///< android.app.Activity instance for this application. Usually provided through the android_app structure, or through other means if your application has an overridden activity.

	bool                bVerboseSink;           ///< Enable this to inspect sink behavior. Useful for debugging non-standard Android devices.
	bool				bEnableLowLatency;		///< Used the lowest output latency possible for the current hardware.
												/// If true (default), the output audio device will be initialized in low-latency operation, allowing for more responsive audio playback on most devices. However, when operating in low-latency mode, some devices may have differences in audio reproduction.
												/// If false, the output audio device will be initialized without low-latency operation.
};

struct AkInitSettings;

namespace AK
{
	namespace SoundEngine
	{
		/// Get instance of OpenSL created by the sound engine at initialization.
		/// \return NULL if sound engine is not initialized
		AK_EXTERNAPIFUNC( SLObjectItf, GetWwiseOpenSLInterface )();

		/// Gets specific settings for the fast audio path on Android.  Call this function after AK::SoundEngine::GetDefaultSettings and AK::SoundEngine::GetPlatformDefaultSettings to modify settings for the fast path.
		/// in_pfSettings.pJavaVM and in_pfSettings.jNativeActivity must be filled properly prior to calling GetFastPathSettings.
		/// The fast path constraints are:
		/// -The sample rate must match the hardware native sample rate 
		/// -The number of samples per frame must be a multiple of the hardware buffer size.
		/// Not fulfilling these constraints makes the audio hardware less efficient.
		/// In general, using the fast path means a higher CPU usage.  Complex audio designs may not be feasible while using the fast path.
		AKRESULT GetFastPathSettings(AkInitSettings &in_settings, AkPlatformInitSettings &in_pfSettings);
	};
};