/** 
 * @file llvoicevisualizer.h
 * @brief Draws in-world speaking indicators.
 *
 * Copyright (c) 2000-$CurrentYear$, Linden Research, Inc.
 * $License$
 */

//--------------------------------------------------------------------
//
// VOICE VISUALIZER
// author: JJ Ventrella, Linden Lab
// (latest update to this info: Jan 18, 2007)
//
// The Voice Visualizer is responsible for taking realtime signals from actual users speaking and 
// visualizing this speech in two forms: 
//
// (1) as a dynamic sound symbol (also referred to as the "voice indicator" that appears over the avatar's head
// (2) as gesticulation events that are used to trigger avatr gestures 
//
// The input for the voice visualizer is a continual stream of voice amplitudes. 

//-----------------------------------------------------------------------------
#ifndef LL_VOICE_VISUALIZER_H
#define LL_VOICE_VISUALIZER_H

#include "llhudeffect.h"

//-----------------------------------------------------------------------------------------------
// The values of voice gesticulation represent energy levels for avatar animation, based on 
// amplitude surge events parsed from the voice signal. These are made available so that 
// the appropriate kind of avatar animation can be triggered, and thereby simulate the physical
// motion effects of speech. It is recommended that multiple body parts be animated as well as 
// lips, such as head, shoulders, and hands, with large gestures used when the energy level is high.
//-----------------------------------------------------------------------------------------------
enum VoiceGesticulationLevel
{
	VOICE_GESTICULATION_LEVEL_OFF = -1,
	VOICE_GESTICULATION_LEVEL_LOW = 0,
	VOICE_GESTICULATION_LEVEL_MEDIUM,
	VOICE_GESTICULATION_LEVEL_HIGH,
	NUM_VOICE_GESTICULATION_LEVELS
};

const static int NUM_VOICE_SYMBOL_WAVES = 7;

//----------------------------------------------------
// LLVoiceVisualizer class 
//----------------------------------------------------
class LLVoiceVisualizer : public LLHUDEffect
{
	//---------------------------------------------------
	// public methods 
	//---------------------------------------------------
	public:
		LLVoiceVisualizer ( const U8 type );	//constructor
		~LLVoiceVisualizer();					//destructor
		
		friend class LLHUDObject;

		void					setVoiceSourceWorldPosition( const LLVector3 &p );		// this should be the position of the speaking avatar's head
		void					setMinGesticulationAmplitude( F32 );					// the lower range of meaningful amplitude for setting gesticulation level 
		void					setMaxGesticulationAmplitude( F32 );					// the upper range of meaningful amplitude for setting gesticulation level 
		void					setStartSpeaking();										// tell me when the av starts speaking
		void					setVoiceEnabled( bool );								// tell me whether or not the user is voice enabled
		void					setSpeakingAmplitude( F32 );							// tell me how loud the av is speaking (ranges from 0 to 1)
		void					setStopSpeaking();										// tell me when the av stops speaking
		bool					getCurrentlySpeaking();									// the get for the above set
		VoiceGesticulationLevel	getCurrentGesticulationLevel();							// based on voice amplitude, I'll give you the current "energy level" of avatar speech

		void					render();												// inherited from HUD Effect
		void 					packData(LLMessageSystem *mesgsys);						// inherited from HUD Effect
		void 					unpackData(LLMessageSystem *mesgsys, S32 blocknum);		// inherited from HUD Effect
		void					markDead();											// inherited from HUD Effect
		
		//----------------------------------------------------------------------------------------------
		// "setMaxGesticulationAmplitude" and "setMinGesticulationAmplitude" allow for the tuning of the 
		// gesticulation level detector to be responsive to different kinds of signals. For instance, we 
		// may find that the average voice amplitude rarely exceeds 0.7 (in a range from 0 to 1), and 
		// therefore we may want to set 0.7 as the max, so we can more easily catch all the variance 
		// within that range. Also, we may find that there is often noise below a certain range like 0.1, 
		// and so we would want to set 0.1 as the min so as not to accidentally use this as signal.
		//----------------------------------------------------------------------------------------------
		void setMaxGesticulationAmplitude(); 
		void setMinGesticulationAmplitude(); 

	//---------------------------------------------------
	// private members 
	//---------------------------------------------------
	private:
	
		struct SoundSymbol
		{
			F32						mWaveExpansion			[ NUM_VOICE_SYMBOL_WAVES ];
			bool					mWaveActive				[ NUM_VOICE_SYMBOL_WAVES ];
			F64						mWaveFadeOutStartTime	[ NUM_VOICE_SYMBOL_WAVES ];
			F32						mWaveOpacity			[ NUM_VOICE_SYMBOL_WAVES ];
			LLPointer<LLImageGL>	mTexture				[ NUM_VOICE_SYMBOL_WAVES ];
			bool					mActive;
			LLVector3				mPosition;
		};

		LLFrameTimer			mTimer;							// so I can ask the current time in seconds
		F64						mCurrentTime;					// current time in seconds, captured every step
		F64						mPreviousTime;					// copy of "current time" from last frame
		SoundSymbol				mSoundSymbol;					// the sound symbol that appears over the avatar's head
		bool					mVoiceEnabled;					// if off, no rendering should happen
		bool					mCurrentlySpeaking;				// is the user currently speaking?
		LLVector3				mVoiceSourceWorldPosition;		// give this to me every step - I need it to update the sound symbol
		F32						mSpeakingAmplitude;				// this should be set as often as possible when the user is speaking
		F32						mMaxGesticulationAmplitude;		// this is the upper-limit of the envelope of detectable gesticulation leves
		F32						mMinGesticulationAmplitude;		// this is the lower-limit of the envelope of detectable gesticulation leves
		
};//-----------------------------------------------------------------
 //   end of LLVoiceVisualizer class
//------------------------------------------------------------------

#endif //LL_VOICE_VISUALIZER_H