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VBVMR_AudioCallbackRegister();
VBVMR_AudioCallbackStart();
VBVMR_AudioCallbackStop();
VBVMR_AudioCallbackUnregister();

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typedef struct tagVBVMR_AUDIOINFO
{
	long samplerate;
	long nbSamplePerFrame;
} VBVMR_T_AUDIOINFO, *VBVMR_PT_AUDIOINFO, *VBVMR_LPT_AUDIOINFO;


typedef struct tagVBVMR_AUDIOBUFFER
{
	long audiobuffer_sr;		//Sampling Rate
	long audiobuffer_nbs;	//number of sample per frame
	long audiobuffer_nbi;		//number of inputs
	long audiobuffer_nbo;	//number of outputs
	float * audiobuffer_r[128];	//nbi input pointers containing frame of nbs sample (of 32bits float)
	float * audiobuffer_w[128];	//nbo output pointers containing frame of nbs sample (of 32bits float)
} VBVMR_T_AUDIOBUFFER, *VBVMR_PT_AUDIOBUFFER, *VBVMR_LPT_AUDIOBUFFER;


	/** 
	@brief VB-AUDIO Callback is called for different task to Initialize, perform and end your process.
	       VB-AUDIO Callback is part of single TIME CRITICAL Thread. 
	       VB-AUDIO Callback is non re-entrant (cannot be called while in process)
	       VB-AUDIO Callback is supposed to be REAL TIME when called to process buffer.
		   (it means that the process has to be performed as fast as possible, waiting cycles are forbidden.
		   do not use O/S synchronization object, even Critical_Section can generate waiting cycle. Do not use 
		   system functions that can generate waiting cycle like display, disk or communication functions for example).
		   
	@param lpUser: User pointer given on callback registration.
	@param ncommand: reason why the callback is called.
	@param lpData: pointer on structure, pending on nCommand.
	@param nnn: additional data, unused

	@return :	 0: always 0 (unused).
	*/


typedef long (__stdcall *T_VBVMR_VBAUDIOCALLBACK)(void * lpUser, long nCommand, void * lpData, long nnn);


#define  VBVMR_CBCOMMAND_STARTING		1	//command to initialize data according SR and buffer size
											//info = (VBVMR_LPT_AUDIOINFO)lpData 

#define  VBVMR_CBCOMMAND_ENDING			2	//command to release data
#define  VBVMR_CBCOMMAND_CHANGE			3	//If change in audio stream, you will have to restart audio 

#define  VBVMR_CBCOMMAND_BUFFER_IN		10  //input insert
#define  VBVMR_CBCOMMAND_BUFFER_OUT	11  //bus output insert
#define  VBVMR_CBCOMMAND_BUFFER_MAIN	20  //all i/o 											//audiobuffer = (VBVMR_LPT_AUDIOBUFFER)lpData 								//nnn = synchro = 1 if synchro with Voicemeeter
											

	/** 
	@brief register your audio callback function to receive real time audio buffer
			it's possible to register up to 3x different Audio Callback in the same application or in 
			3x different applications. In the same application, this is possible because Voicemeeter
			provides 3 kind of audio Streams:
				- AUDIO INPUT INSERT (to process all Voicemeeter inputs as insert)	
				- AUDIO OUTPUT INSERT (to process all Voicemeeter BUS outputs as insert)	
				- ALL AUDIO I/O (to process all Voicemeeter i/o).
			Note: a single callback can be used to receive the 3 possible audio streams.

	@param mode : callback type (main, input or bus output) see define below
	@param pCallback : Pointer on your callback function.
	@param lpUser : user pointer (pointer that will be passed in callback first argument).
	@param szClientName[64]: IN: Name of the application registering the Callback.
							 OUT: Name of the application already registered.
	@return :	 0: OK (no error).
				-1: error
				 1: callback already registered (by another application).
	*/

long __stdcall VBVMR_AudioCallbackRegister(long mode, T_VBVMR_VBAUDIOCALLBACK pCallback, void * lpUser, char szClientName[64]);

#define VBVMR_AUDIOCALLBACK_IN	0x00000001	//to process input insert
#define VBVMR_AUDIOCALLBACK_OUT	0x00000002  //to process output bus insert
#define VBVMR_AUDIOCALLBACK_MAIN	0x00000004  //to receive all i/o

	/** 
	@brief	Start / Stop Audio processing 
			
			he Callback will be called with 
	@return :	 0: OK (no error).
				-1: error
				-2: no callback registred.
	*/

long __stdcall VBVMR_AudioCallbackStart(void);
long __stdcall VBVMR_AudioCallbackStop(void);


	/** 
	@brief unregister your callback to release voicemeeter virtual driver
	@param pCallback : Pointer on your callback function.
	@return :	 0: OK (no error).
				-1: error
				 1: callback already unregistered.
	*/

long __stdcall VBVMR_AudioCallbackUnregister(void);