Software envelope generator interface More...

Collaboration diagram for Software envelope generator APIs:

Data Structures
struct	sound_eg_AHDSR
	Parameters for AHDSR envelope generator. More...

struct	sound_eg_LPCM
	Parameters for linear PCM (8-bit, 60Hz) envelope generator. More...

struct	sound_eg_attribute
	Attributes of a software envelope generator object. More...

union	sound_eg_attribute.__unnamed7__

Macros
#define	SOUND_EG_TABLE_MAX (16)
	The maximum number of elements for the envelope generator attribute table.

#define	SOUND_EG_AHDSR (0)
	The class identifier for AHDSR envelope generator.

#define	SOUND_EG_LPCM (1)
	The class identifier for LPCM envelope generator.

Functions
void	sound_set_eg_table (const struct sound_eg_attribute *table)
	`MSX` (Re)set the software envelope generator attribute table.

Detailed Description

Software envelope generator interface

Data Structure Documentation

◆ sound_eg_AHDSR

struct sound_eg_AHDSR

Parameters for AHDSR envelope generator.

Definition at line 42 of file sound_eg.h.

Data Fields
uint8_t	attack_rate	Asccendant velocity of attack phase.
uint8_t	hold_time	Period of hold phase.
uint8_t	decay_rate	Deccendant velocity of decay phase.
uint8_t	sustain_level	Output level of sustain phase.
uint8_t	release_rate	desccendant velocity of release phase

◆ sound_eg_LPCM

struct sound_eg_LPCM

Parameters for linear PCM (8-bit, 60Hz) envelope generator.

Definition at line 56 of file sound_eg.h.

Data Fields
uint8_t	len	number of sampled signal levels
uint8_t *	data	time series of the sampled signal levels (i.e. wave form)

◆ sound_eg_attribute

struct sound_eg_attribute

Attributes of a software envelope generator object.

The attribute consists of the following two parts:

an envelope generator class identifier clz
a set of parameter constants param

The clz shall be one of the two classes:

SOUND_EG_AHDSR for AHDSR type envelope generator, or
SOUND_EG_LPCM for 8-bit 60Hz Linear PCM type envelope generator.

The param shall be a pointer to parameter constants, and it has the following two strictly typed sinonym:

ahdsr of const struct sound_eg_AHDSR * type for AHDSR type envelope generator.
lpcm of const struct sound_eg_LPCM * type for 8-bit 60Hz Linear PCM type envelope generator.

Definition at line 81 of file sound_eg.h.

Data Fields
uint8_t	clz	The class identifier of this envelope generator.
union sound_eg_attribute.__unnamed7__	__unnamed__

◆ sound_eg_attribute.unnamed7

union sound_eg_attribute.__unnamed7__

Definition at line 86 of file sound_eg.h.

Data Fields
void *	param	Pointer to parameter constants for this instance.
const struct sound_eg_AHDSR *	ahdsr	Pointer to parameter constants for this instance of the SOUND_EG_AHDSR class. This is a strictly typed sinonym for `param`.
const struct sound_eg_LPCM *	lpcm	Pointer to parameter constants for this instance of the SOUND_EG_LPCM class. This is a strictly typed sinonym for `param`.

Macro Definition Documentation

◆ SOUND_EG_TABLE_MAX

#define SOUND_EG_TABLE_MAX (16)

The maximum number of elements for the envelope generator attribute table.

Definition at line 34 of file sound_eg.h.

◆ SOUND_EG_AHDSR

#define SOUND_EG_AHDSR (0)

The class identifier for AHDSR envelope generator.

Definition at line 37 of file sound_eg.h.

◆ SOUND_EG_LPCM

#define SOUND_EG_LPCM (1)

The class identifier for LPCM envelope generator.

Definition at line 39 of file sound_eg.h.

Function Documentation

◆ sound_set_eg_table()

void sound_set_eg_table ( const struct sound_eg_attribute * table )

MSX (Re)set the software envelope generator attribute table.

This function sets the base address of the software envelope generator table to the given address table, or reset to the default if table was NULL.

The table should be an array of struct sound_eg_attribute with a maximum of 16 elements. Each element can contain the individual parameter settings of an envelope generator of type AHDSR or LPCM.

Parameters

table base address of the attribute table.

Data Structures

Macros

Functions