voice.h File Reference

Synthesis voice manipulation functions. More...

Enumerations
enum	fluid_voice_add_mod { FLUID_VOICE_OVERWRITE, FLUID_VOICE_ADD, FLUID_VOICE_DEFAULT }
	Enum used with fluid_voice_add_mod() to specify how to handle duplicate modulators. More...
Functions
FLUIDSYNTH_API void	fluid_voice_update_param (fluid_voice_t *voice, int gen)
	Update all the synthesis parameters, which depend on generator gen.
FLUIDSYNTH_API void	fluid_voice_add_mod (fluid_voice_t *voice, fluid_mod_t *mod, int mode)
	Adds a modulator to the voice.
FLUIDSYNTH_API void	fluid_voice_gen_set (fluid_voice_t *voice, int gen, float val)
	Set the value of a generator.
FLUIDSYNTH_API float	fluid_voice_gen_get (fluid_voice_t *voice, int gen)
	Get the value of a generator.
FLUIDSYNTH_API void	fluid_voice_gen_incr (fluid_voice_t *voice, int gen, float val)
	Offset the value of a generator.
FLUIDSYNTH_API unsigned int	fluid_voice_get_id (fluid_voice_t *voice)
	Get the unique ID of the noteon-event.
FLUIDSYNTH_API int	fluid_voice_is_playing (fluid_voice_t *voice)
	Check if a voice is still playing.
FLUIDSYNTH_API int	fluid_voice_optimize_sample (fluid_sample_t *s)
	Calculate the peak volume of a sample for voice off optimization.

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Detailed Description

Synthesis voice manipulation functions.

The interface to the synthesizer's voices. Examples on using them can be found in fluid_defsfont.c. Most of these functions should only be called from within synthesis context, such as the SoundFont loader's noteon method.

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Enumeration Type Documentation

enum fluid_voice_add_mod

Enum used with fluid_voice_add_mod() to specify how to handle duplicate modulators.

Enumerator:

FLUID_VOICE_OVERWRITE	Overwrite any existing matching modulator.
FLUID_VOICE_ADD	Add (sum) modulator amounts.
FLUID_VOICE_DEFAULT	For default modulators only, no need to check for duplicates.

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Function Documentation

FLUIDSYNTH_API void fluid_voice_update_param	(	fluid_voice_t *	voice,
		int	gen
	)

Update all the synthesis parameters, which depend on generator gen.

Parameters:

	voice	Voice instance
	gen	Generator id (fluid_gen_type)

This is only necessary after changing a generator of an already operating voice. Most applications will not need this function.

FLUIDSYNTH_API void fluid_voice_add_mod	(	fluid_voice_t *	voice,
		fluid_mod_t *	mod,
		int	mode
	)

Adds a modulator to the voice.

Parameters:

	voice	Voice instance
	mod	Modulator info (copied)
	mode	Determines how to handle an existing identical modulator FLUID_VOICE_ADD to add (offset) the modulator amounts, FLUID_VOICE_OVERWRITE to replace the modulator, FLUID_VOICE_DEFAULT when adding a default modulator - no duplicate should exist so don't check.

FLUIDSYNTH_API void fluid_voice_gen_set	(	fluid_voice_t *	voice,
		int	i,
		float	val
	)

Set the value of a generator.

Parameters:

	voice	Voice instance
	i	Generator ID (fluid_gen_type)
	val	Generator value

FLUIDSYNTH_API float fluid_voice_gen_get	(	fluid_voice_t *	voice,
		int	gen
	)

Get the value of a generator.

Parameters:

	voice	Voice instance
	gen	Generator ID (fluid_gen_type)

Returns:

Current generator value

FLUIDSYNTH_API void fluid_voice_gen_incr	(	fluid_voice_t *	voice,
		int	i,
		float	val
	)

Offset the value of a generator.

Parameters:

	voice	Voice instance
	i	Generator ID (fluid_gen_type)
	val	Value to add to the existing value

FLUIDSYNTH_API unsigned int fluid_voice_get_id

(

fluid_voice_t *

voice

)

Get the unique ID of the noteon-event.

Parameters:

voice

Voice instance

Returns:

Note on unique ID

A SoundFont loader may store the voice processes it has created for real-time control during the operation of a voice (for example: parameter changes in SoundFont editor). The synth uses a pool of voices, which are 'recycled' and never deallocated.

Before modifying an existing voice, check

• that its state is still 'playing'
• that the ID is still the same

Otherwise the voice has finished playing.

FLUIDSYNTH_API int fluid_voice_is_playing

(

fluid_voice_t *

voice

)

Check if a voice is still playing.

Parameters:

voice

Voice instance

Returns:

TRUE if playing, FALSE otherwise

FLUIDSYNTH_API int fluid_voice_optimize_sample

(

fluid_sample_t *

s

)

Calculate the peak volume of a sample for voice off optimization.

Parameters:

s

Sample to optimize

Returns:

FLUID_OK on success, FLUID_FAILED otherwise

If the peak volume during the loop is known, then the voice can be released earlier during the release phase. Otherwise, the voice will operate (inaudibly), until the envelope is at the nominal turnoff point. So it's a good idea to call fluid_voice_optimize_sample() on each sample once.