129 lines
4.3 KiB
C
129 lines
4.3 KiB
C
/* nekobee DSSI software synthesizer plugin
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*
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* Copyright (C) 2004 Sean Bolton and others.
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*
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* Portions of this file may have come from Steve Brookes'
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* nekobee, copyright (C) 1999 S. J. Brookes.
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* Portions of this file may have come from Peter Hanappe's
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* Fluidsynth, copyright (C) 2003 Peter Hanappe and others.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be
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* useful, but WITHOUT ANY WARRANTY; without even the implied
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* warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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* PURPOSE. See the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public
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* License along with this program; if not, write to the Free
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* Software Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307, USA.
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*/
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#ifndef _XSYNTH_VOICE_H
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#define _XSYNTH_VOICE_H
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#include <string.h>
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#include <stdint.h>
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#include "nekobee_types.h"
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/* maximum size of a rendering burst */
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#define XSYNTH_NUGGET_SIZE 64
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struct _nekobee_patch_t {
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float tuning;
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unsigned char waveform;
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float cutoff;
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float resonance;
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float envmod;
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float decay;
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float accent;
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float volume;
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};
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enum nekobee_voice_status {
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XSYNTH_VOICE_OFF, /* silent: is not processed by render loop */
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XSYNTH_VOICE_ON, /* has not received a note off event */
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XSYNTH_VOICE_SUSTAINED, /* has received note off, but sustain controller is
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on */
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XSYNTH_VOICE_RELEASED /* had note off, not sustained, in final decay phase
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of envelopes */
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};
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struct blosc_t {
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float phase; // 0 - 1, with 1 being 2pi radians of phase rotation
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float delay; // one sample delay for blep
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};
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/*
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* nekobee_voice_t
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*/
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struct _nekobee_voice_t {
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unsigned int note_id;
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unsigned char status;
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unsigned char key;
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unsigned char velocity;
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unsigned char rvelocity; /* the note-off velocity */
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/* translated controller values */
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float pressure; /* filter resonance multiplier, off = 1.0, full on = 0.0 */
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/* persistent voice state */
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float prev_pitch, target_pitch, lfo_pos;
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struct blosc_t osc;
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float vca_eg, vcf_eg, accent_slug, delay1, delay2, delay3, delay4;
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float vca_tc, vcf_tc; // VCA and VCF time constants
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unsigned char vca_eg_phase, vcf_eg_phase;
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int osc_index; /* shared index into osc_audio */
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float osc_audio[XSYNTH_NUGGET_SIZE];
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float delayhp;
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};
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#define _PLAYING(voice) ((voice)->status != XSYNTH_VOICE_OFF)
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#define _ON(voice) ((voice)->status == XSYNTH_VOICE_ON)
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#define _SUSTAINED(voice) ((voice)->status == XSYNTH_VOICE_SUSTAINED)
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#define _RELEASED(voice) ((voice)->status == XSYNTH_VOICE_RELEASED)
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#define _AVAILABLE(voice) ((voice)->status == XSYNTH_VOICE_OFF)
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extern float nekobee_pitch[129];
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/* nekobee_voice.c */
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nekobee_voice_t *nekobee_voice_new();
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void nekobee_voice_note_on(nekobee_synth_t *synth, nekobee_voice_t *voice,
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unsigned char key, unsigned char velocity);
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void nekobee_voice_remove_held_key(nekobee_synth_t *synth, unsigned char key);
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void nekobee_voice_note_off(nekobee_synth_t *synth, nekobee_voice_t *voice,
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unsigned char key, unsigned char rvelocity);
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void nekobee_voice_release_note(nekobee_synth_t *synth, nekobee_voice_t *voice);
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void nekobee_voice_set_ports(nekobee_synth_t *synth, nekobee_patch_t *patch);
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void nekobee_voice_update_pressure_mod(nekobee_synth_t *synth,
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nekobee_voice_t *voice);
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/* nekobee_voice_render.c */
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void nekobee_init_tables(void);
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void nekobee_voice_render(nekobee_synth_t *synth, float *out,
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uint32_t count);
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/* inline functions */
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/*
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* nekobee_voice_off
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*
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* Purpose: Turns off a voice immediately, meaning that it is not processed
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* anymore by the render loop.
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*/
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static inline void nekobee_voice_off(nekobee_voice_t *voice) {
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voice->status = XSYNTH_VOICE_OFF;
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/* silence the oscillator buffer for the next use */
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memset(voice->osc_audio, 0, XSYNTH_NUGGET_SIZE * sizeof(float));
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/* -FIX- decrement active voice count? */
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}
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#endif /* _XSYNTH_VOICE_H */
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