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Import libfluidsynth into the Ardour codebase
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Robin Gareus
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ac8617017a
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ac05f05023
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libs/fluidsynth/src/fluid_rvoice.h
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libs/fluidsynth/src/fluid_rvoice.h
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/* FluidSynth - A Software Synthesizer
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*
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* Copyright (C) 2003 Peter Hanappe and others.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public License
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* as 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 library is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the Free
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* Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA
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*/
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#ifndef _FLUID_RVOICE_H
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#define _FLUID_RVOICE_H
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#include "fluidsynth_priv.h"
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#include "fluid_iir_filter.h"
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#include "fluid_adsr_env.h"
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#include "fluid_lfo.h"
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#include "fluid_phase.h"
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#include "fluid_sfont.h"
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typedef struct _fluid_rvoice_envlfo_t fluid_rvoice_envlfo_t;
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typedef struct _fluid_rvoice_dsp_t fluid_rvoice_dsp_t;
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typedef struct _fluid_rvoice_buffers_t fluid_rvoice_buffers_t;
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typedef struct _fluid_rvoice_t fluid_rvoice_t;
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/* Smallest amplitude that can be perceived (full scale is +/- 0.5)
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* 16 bits => 96+4=100 dB dynamic range => 0.00001
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* 0.00001 * 2 is approximately 0.00003 :)
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*/
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#define FLUID_NOISE_FLOOR 0.00003
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enum fluid_loop {
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FLUID_UNLOOPED = 0,
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FLUID_LOOP_DURING_RELEASE = 1,
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FLUID_NOTUSED = 2,
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FLUID_LOOP_UNTIL_RELEASE = 3
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};
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/**
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* rvoice ticks-based parameters
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* These parameters must be updated even if the voice is currently quiet.
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*/
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struct _fluid_rvoice_envlfo_t
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{
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/* Note-off minimum length */
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unsigned int ticks;
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unsigned int noteoff_ticks;
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/* vol env */
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fluid_adsr_env_t volenv;
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/* mod env */
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fluid_adsr_env_t modenv;
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fluid_real_t modenv_to_fc;
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fluid_real_t modenv_to_pitch;
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/* mod lfo */
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fluid_lfo_t modlfo;
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fluid_real_t modlfo_to_fc;
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fluid_real_t modlfo_to_pitch;
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fluid_real_t modlfo_to_vol;
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/* vib lfo */
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fluid_lfo_t viblfo;
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fluid_real_t viblfo_to_pitch;
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};
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/**
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* rvoice parameters needed for dsp interpolation
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*/
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struct _fluid_rvoice_dsp_t
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{
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/* interpolation method, as in fluid_interp in fluidsynth.h */
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int interp_method;
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fluid_sample_t* sample;
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int check_sample_sanity_flag; /* Flag that initiates, that sample-related parameters
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have to be checked. */
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/* sample and loop start and end points (offset in sample memory). */
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int start;
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int end;
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int loopstart;
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int loopend; /* Note: first point following the loop (superimposed on loopstart) */
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enum fluid_loop samplemode;
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/* Stuff needed for phase calculations */
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fluid_real_t pitch; /* the pitch in midicents */
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fluid_real_t root_pitch_hz;
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fluid_real_t output_rate;
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/* Stuff needed for amplitude calculations */
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int has_looped; /* Flag that is set as soon as the first loop is completed. */
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fluid_real_t attenuation; /* the attenuation in centibels */
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fluid_real_t min_attenuation_cB; /* Estimate on the smallest possible attenuation
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* during the lifetime of the voice */
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fluid_real_t amplitude_that_reaches_noise_floor_nonloop;
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fluid_real_t amplitude_that_reaches_noise_floor_loop;
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fluid_real_t synth_gain; /* master gain */
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/* Dynamic input to the interpolator below */
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fluid_real_t *dsp_buf; /* buffer to store interpolated sample data to */
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fluid_real_t amp; /* current linear amplitude */
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fluid_real_t amp_incr; /* amplitude increment value for the next FLUID_BUFSIZE samples */
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fluid_phase_t phase; /* the phase (current sample offset) of the sample wave */
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fluid_real_t phase_incr; /* the phase increment for the next FLUID_BUFSIZE samples */
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int is_looping;
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};
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/* Currently left, right, reverb, chorus. To be changed if we
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ever add surround positioning, or stereo reverb/chorus */
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#define FLUID_RVOICE_MAX_BUFS (4)
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/**
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* rvoice mixer-related parameters
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*/
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struct _fluid_rvoice_buffers_t
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{
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unsigned int count; /* Number of records in "bufs" */
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struct {
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fluid_real_t amp;
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int mapping; /* Mapping to mixdown buffer index */
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} bufs[FLUID_RVOICE_MAX_BUFS];
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};
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/**
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* Parameters needed to synthesize a voice
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*/
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struct _fluid_rvoice_t
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{
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fluid_rvoice_envlfo_t envlfo;
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fluid_rvoice_dsp_t dsp;
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fluid_iir_filter_t resonant_filter; /* IIR resonant dsp filter */
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fluid_rvoice_buffers_t buffers;
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};
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int fluid_rvoice_write(fluid_rvoice_t* voice, fluid_real_t *dsp_buf);
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void fluid_rvoice_buffers_mix(fluid_rvoice_buffers_t* buffers,
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fluid_real_t* dsp_buf, int samplecount,
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fluid_real_t** dest_bufs, int dest_bufcount);
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void fluid_rvoice_buffers_set_amp(fluid_rvoice_buffers_t* buffers,
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unsigned int bufnum, fluid_real_t value);
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void fluid_rvoice_buffers_set_mapping(fluid_rvoice_buffers_t* buffers,
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unsigned int bufnum, int mapping);
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/* Dynamic update functions */
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void fluid_rvoice_noteoff(fluid_rvoice_t* voice, unsigned int min_ticks);
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void fluid_rvoice_voiceoff(fluid_rvoice_t* voice);
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void fluid_rvoice_reset(fluid_rvoice_t* voice);
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void fluid_rvoice_set_output_rate(fluid_rvoice_t* voice, fluid_real_t output_rate);
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void fluid_rvoice_set_interp_method(fluid_rvoice_t* voice, int interp_method);
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void fluid_rvoice_set_root_pitch_hz(fluid_rvoice_t* voice, fluid_real_t root_pitch_hz);
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void fluid_rvoice_set_pitch(fluid_rvoice_t* voice, fluid_real_t value);
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void fluid_rvoice_set_synth_gain(fluid_rvoice_t* voice, fluid_real_t value);
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void fluid_rvoice_set_attenuation(fluid_rvoice_t* voice, fluid_real_t value);
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void fluid_rvoice_set_min_attenuation_cB(fluid_rvoice_t* voice, fluid_real_t value);
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void fluid_rvoice_set_viblfo_to_pitch(fluid_rvoice_t* voice, fluid_real_t value);
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void fluid_rvoice_set_modlfo_to_pitch(fluid_rvoice_t* voice, fluid_real_t value);
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void fluid_rvoice_set_modlfo_to_vol(fluid_rvoice_t* voice, fluid_real_t value);
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void fluid_rvoice_set_modlfo_to_fc(fluid_rvoice_t* voice, fluid_real_t value);
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void fluid_rvoice_set_modenv_to_fc(fluid_rvoice_t* voice, fluid_real_t value);
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void fluid_rvoice_set_modenv_to_pitch(fluid_rvoice_t* voice, fluid_real_t value);
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void fluid_rvoice_set_start(fluid_rvoice_t* voice, int value);
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void fluid_rvoice_set_end(fluid_rvoice_t* voice, int value);
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void fluid_rvoice_set_loopstart(fluid_rvoice_t* voice, int value);
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void fluid_rvoice_set_loopend(fluid_rvoice_t* voice, int value);
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void fluid_rvoice_set_sample(fluid_rvoice_t* voice, fluid_sample_t* value);
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void fluid_rvoice_set_samplemode(fluid_rvoice_t* voice, enum fluid_loop value);
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/* defined in fluid_rvoice_dsp.c */
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void fluid_rvoice_dsp_config (void);
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int fluid_rvoice_dsp_interpolate_none (fluid_rvoice_dsp_t *voice);
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int fluid_rvoice_dsp_interpolate_linear (fluid_rvoice_dsp_t *voice);
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int fluid_rvoice_dsp_interpolate_4th_order (fluid_rvoice_dsp_t *voice);
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int fluid_rvoice_dsp_interpolate_7th_order (fluid_rvoice_dsp_t *voice);
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#endif
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