Synthesis Voice Control

Low-level access to synthesis voices. More...

Functions
fluid_voice_t *	fluid_synth_alloc_voice (fluid_synth_t *synth, fluid_sample_t *sample, int channum, int key, int vel)
	Allocate a synthesis voice.
void	fluid_synth_get_voicelist (fluid_synth_t *synth, fluid_voice_t *buf[], int bufsize, int ID)
	Get list of currently playing voices.
int	fluid_synth_start (fluid_synth_t *synth, unsigned int id, fluid_preset_t *preset, int audio_chan, int midi_chan, int key, int vel)
	Create and start voices using an arbitrary preset and a MIDI note on event.
void	fluid_synth_start_voice (fluid_synth_t *synth, fluid_voice_t *voice)
	Activate a voice previously allocated with fluid_synth_alloc_voice().
int	fluid_synth_stop (fluid_synth_t *synth, unsigned int id)
	Stop notes for a given note event voice ID.

Detailed Description

Low-level access to synthesis voices.

Function Documentation

fluid_synth_alloc_voice()

fluid_voice_t * fluid_synth_alloc_voice	(	fluid_synth_t *	synth,
		fluid_sample_t *	sample,
		int	chan,
		int	key,
		int	vel )

Allocate a synthesis voice.

Parameters

Synthesizer	FluidSynth instance
sample	Sample to assign to the voice
chan	MIDI channel number (0 to MIDI channel count - 1)
key	MIDI note number for the voice (0-127)
vel	MIDI velocity for the voice (0-127)

Returns

Allocated synthesis voice or NULL on error

This function is called by a SoundFont's preset in response to a noteon event. The returned voice comes with default modulators and generators. A single noteon event may create any number of voices, when the preset is layered.

Note

Should only be called from within synthesis thread, which includes SoundFont loader preset noteon method.

fluid_synth_get_voicelist()

void fluid_synth_get_voicelist	(	fluid_synth_t *	synth,
		fluid_voice_t *	buf[],
		int	bufsize,
		int	id )

Get list of currently playing voices.

Parameters

Synthesizer	FluidSynth instance
buf	Array to store voices to (NULL terminated if not filled completely)
bufsize	Count of indexes in buf
id	Voice ID to search for or < 0 to return list of all playing voices

Note

Should only be called from within synthesis thread, which includes SoundFont loader preset noteon methods. Voices are only guaranteed to remain unchanged until next synthesis process iteration.

fluid_synth_start()

int fluid_synth_start	(	fluid_synth_t *	synth,
		unsigned int	id,
		fluid_preset_t *	preset,
		int	audio_chan,
		int	chan,
		int	key,
		int	vel )

Create and start voices using an arbitrary preset and a MIDI note on event.

Using this function is only supported when the setting synth.dynamic-sample-loading is false!

Parameters

Synthesizer	FluidSynth instance
id	Voice group ID to use (can be used with fluid_synth_stop()).
preset	Preset to synthesize
audio_chan	Unused currently, set to 0
chan	MIDI channel number (0 to MIDI channel count - 1)
key	MIDI note number (0-127)
vel	MIDI velocity number (1-127)

Returns

FLUID_OK on success, FLUID_FAILED otherwise

Note

Should only be called from within synthesis thread, which includes SoundFont loader preset noteon method.

fluid_synth_start_voice()

void fluid_synth_start_voice	(	fluid_synth_t *	synth,
		fluid_voice_t *	voice )

Activate a voice previously allocated with fluid_synth_alloc_voice().

Parameters

Synthesizer	FluidSynth instance
voice	Voice to activate

This function is called by a SoundFont's preset in response to a noteon event. Exclusive classes are processed here.

Note

Should only be called from within synthesis thread, which includes SoundFont loader preset noteon method.

fluid_synth_stop()

int fluid_synth_stop	(	fluid_synth_t *	synth,
		unsigned int	id )

Stop notes for a given note event voice ID.

Parameters

Synthesizer	FluidSynth instance
id	Voice note event ID

Returns

FLUID_OK on success, FLUID_FAILED otherwise

Note

In FluidSynth versions prior to 1.1.0 FLUID_FAILED would be returned if no matching voice note event ID was found. Versions after 1.1.0 only return FLUID_FAILED if an error occurs.