The EAX (and volume) manipulation API

Functions
void	NJB_Reset_Get_EAX_Type (njb_t *njb)
njb_eax_t *	NJB_Get_EAX_Type (njb_t *njb)
void	NJB_Destroy_EAX_Type (njb_eax_t *eax)
void	NJB_Adjust_EAX (njb_t *njb, u_int16_t eaxid, u_int16_t patchindex, int16_t scalevalue)

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Function Documentation

void NJB_Adjust_EAX (  njb_t *  njb, u_int16_t  eaxid, u_int16_t  patchindex, int16_t  scalevalue )

This adjusts an EAX control. The magic numbers needed are to be found in njb_eax_t structs retrived with the NJB_Get_EAX_Type() function. In theory, EAX controls could be both selectable (different patchindex can be selected) and scaleable (different scalevalue can be set) but in practice all controls are either selectable or scaleable. Parameters: njb  a pointer to the njb_t object to manipulate the EAX settings on eaxid  a unique ID for the EAX effect to manipulate patchindex  a patch index to set for the EAX effect. If the effect is not selectable, you can set this to 0. scalevalue  a scale value to set for the EAX effect. If the effect is not scaleable, you can set this to 0. Note that this is a signed integer, and may very well be supplied with negative numbers! See also: NJB_Get_EAX_Type()

void NJB_Destroy_EAX_Type (  njb_eax_t *  eax  )

This destroys an EAX Type and frees all memory used by it. Parameters: eax  the EAX Type to destroy Examples: dumpeax.c.

njb_eax_t* NJB_Get_EAX_Type (  njb_t *  njb  )

This retrieves an EAX type from the device. EAX types include volume controls, so this is essential for most player gadgets. Adjustment of the EAX controls according to the values found in njb_eax_t objects is done using the NJB_Ajust_EAX() function. Parameters: njb  a pointer to the njb_t object to reset the EAX retrieveal pointer for Returns: a pointer to a newly allocaed EAX type. This should be freed with NJB_Destroy_EAX_Type() after use. See also: NJB_Reset_Get_EAX_Type() NJB_Adjust_EAX() njb_eax_t Examples: dumpeax.c.

void NJB_Reset_Get_EAX_Type (  njb_t *  njb  )

This function resets the retrieveal of EAX types. It should typically be called before any subsequent calls to NJB_Get_EAX_Type(). Typical usage: njb_t *njb; njb_eax_t *eax; NJB_Reset_Get_EAX_Type(njb); while ( (eax = NJB_Get_EAX_Type(njb)) != NULL ) { // Do something with all the EAX types... NJB_Destroy_EAX_Type(eax); } Parameters: njb  a pointer to the njb_t object to reset the EAX retrieveal pointer for See also: NJB_Get_EAX_Type() Examples: dumpeax.c.

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