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/* FluidSynth - A Software Synthesizer
*
* Copyright (C) 2003 Peter Hanappe and others.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* as published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free
* Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA
*/
#ifndef _FLUID_RVOICE_H
#define _FLUID_RVOICE_H
#include "fluidsynth_priv.h"
#include "fluid_iir_filter.h"
#include "fluid_adsr_env.h"
#include "fluid_lfo.h"
#include "fluid_phase.h"
#include "fluid_sfont.h"
typedef struct _fluid_rvoice_envlfo_t fluid_rvoice_envlfo_t;
typedef struct _fluid_rvoice_dsp_t fluid_rvoice_dsp_t;
typedef struct _fluid_rvoice_buffers_t fluid_rvoice_buffers_t;
typedef struct _fluid_rvoice_t fluid_rvoice_t;
/* Smallest amplitude that can be perceived (full scale is +/- 0.5)
* 16 bits => 96+4=100 dB dynamic range => 0.00001
* 24 bits => 144-4 = 140 dB dynamic range => 1.e-7
* 1.e-7 * 2 == 2.e-7 :)
*/
#define FLUID_NOISE_FLOOR 2.e-7
enum fluid_loop
{
FLUID_UNLOOPED = 0,
FLUID_LOOP_DURING_RELEASE = 1,
FLUID_NOTUSED = 2,
FLUID_LOOP_UNTIL_RELEASE = 3
};
/*
* rvoice ticks-based parameters
* These parameters must be updated even if the voice is currently quiet.
*/
struct _fluid_rvoice_envlfo_t
{
/* Note-off minimum length */
unsigned int ticks;
unsigned int noteoff_ticks;
/* vol env */
fluid_adsr_env_t volenv;
/* mod env */
fluid_adsr_env_t modenv;
fluid_real_t modenv_to_fc;
fluid_real_t modenv_to_pitch;
/* mod lfo */
fluid_lfo_t modlfo;
fluid_real_t modlfo_to_fc;
fluid_real_t modlfo_to_pitch;
fluid_real_t modlfo_to_vol;
/* vib lfo */
fluid_lfo_t viblfo;
fluid_real_t viblfo_to_pitch;
};
/*
* rvoice parameters needed for dsp interpolation
*/
struct _fluid_rvoice_dsp_t
{
/* interpolation method, as in fluid_interp in fluidsynth.h */
enum fluid_interp interp_method;
enum fluid_loop samplemode;
/* Flag that is set as soon as the first loop is completed. */
char has_looped;
/* Flag that initiates, that sample-related parameters have to be checked. */
char check_sample_sanity_flag;
fluid_sample_t *sample;
/* sample and loop start and end points (offset in sample memory). */
int start;
int end;
int loopstart;
int loopend; /* Note: first point following the loop (superimposed on loopstart) */
/* Stuff needed for portamento calculations */
fluid_real_t pitchoffset; /* the portamento range in midicents */
fluid_real_t pitchinc; /* the portamento increment in midicents */
/* Stuff needed for phase calculations */
fluid_real_t pitch; /* the pitch in midicents */
fluid_real_t root_pitch_hz;
fluid_real_t output_rate;
/* Stuff needed for amplitude calculations */
fluid_real_t attenuation; /* the attenuation in centibels */
fluid_real_t prev_attenuation; /* the previous attenuation in centibels
used by fluid_rvoice_multi_retrigger_attack() */
fluid_real_t min_attenuation_cB; /* Estimate on the smallest possible attenuation
* during the lifetime of the voice */
fluid_real_t amplitude_that_reaches_noise_floor_nonloop;
fluid_real_t amplitude_that_reaches_noise_floor_loop;
fluid_real_t synth_gain; /* master gain */
/* Dynamic input to the interpolator below */
fluid_real_t amp; /* current linear amplitude */
fluid_real_t amp_incr; /* amplitude increment value for the next FLUID_BUFSIZE samples */
fluid_phase_t phase; /* the phase (current sample offset) of the sample wave */
fluid_real_t phase_incr; /* the phase increment for the next FLUID_BUFSIZE samples */
};
/* Currently left, right, reverb, chorus. To be changed if we
ever add surround positioning, or stereo reverb/chorus */
#define FLUID_RVOICE_MAX_BUFS (4)
/*
* rvoice mixer-related parameters
*/
struct _fluid_rvoice_buffers_t
{
unsigned int count; /* Number of records in "bufs" */
struct
{
fluid_real_t amp;
int mapping; /* Mapping to mixdown buffer index */
} bufs[FLUID_RVOICE_MAX_BUFS];
};
/*
* Hard real-time parameters needed to synthesize a voice
*/
struct _fluid_rvoice_t
{
fluid_rvoice_envlfo_t envlfo;
fluid_rvoice_dsp_t dsp;
fluid_iir_filter_t resonant_filter; /* IIR resonant dsp filter */
fluid_iir_filter_t resonant_custom_filter; /* optional custom/general-purpose IIR resonant filter */
fluid_rvoice_buffers_t buffers;
};
int fluid_rvoice_write(fluid_rvoice_t *voice, fluid_real_t *dsp_buf);
DECLARE_FLUID_RVOICE_FUNCTION(fluid_rvoice_buffers_set_amp);
DECLARE_FLUID_RVOICE_FUNCTION(fluid_rvoice_buffers_set_mapping);
DECLARE_FLUID_RVOICE_FUNCTION(fluid_rvoice_noteoff);
DECLARE_FLUID_RVOICE_FUNCTION(fluid_rvoice_voiceoff);
DECLARE_FLUID_RVOICE_FUNCTION(fluid_rvoice_reset);
DECLARE_FLUID_RVOICE_FUNCTION(fluid_rvoice_multi_retrigger_attack);
DECLARE_FLUID_RVOICE_FUNCTION(fluid_rvoice_set_portamento);
DECLARE_FLUID_RVOICE_FUNCTION(fluid_rvoice_set_output_rate);
DECLARE_FLUID_RVOICE_FUNCTION(fluid_rvoice_set_interp_method);
DECLARE_FLUID_RVOICE_FUNCTION(fluid_rvoice_set_root_pitch_hz);
DECLARE_FLUID_RVOICE_FUNCTION(fluid_rvoice_set_pitch);
DECLARE_FLUID_RVOICE_FUNCTION(fluid_rvoice_set_attenuation);
DECLARE_FLUID_RVOICE_FUNCTION(fluid_rvoice_set_min_attenuation_cB);
DECLARE_FLUID_RVOICE_FUNCTION(fluid_rvoice_set_viblfo_to_pitch);
DECLARE_FLUID_RVOICE_FUNCTION(fluid_rvoice_set_modlfo_to_pitch);
DECLARE_FLUID_RVOICE_FUNCTION(fluid_rvoice_set_modlfo_to_vol);
DECLARE_FLUID_RVOICE_FUNCTION(fluid_rvoice_set_modlfo_to_fc);
DECLARE_FLUID_RVOICE_FUNCTION(fluid_rvoice_set_modenv_to_fc);
DECLARE_FLUID_RVOICE_FUNCTION(fluid_rvoice_set_modenv_to_pitch);
DECLARE_FLUID_RVOICE_FUNCTION(fluid_rvoice_set_synth_gain);
DECLARE_FLUID_RVOICE_FUNCTION(fluid_rvoice_set_start);
DECLARE_FLUID_RVOICE_FUNCTION(fluid_rvoice_set_end);
DECLARE_FLUID_RVOICE_FUNCTION(fluid_rvoice_set_loopstart);
DECLARE_FLUID_RVOICE_FUNCTION(fluid_rvoice_set_loopend);
DECLARE_FLUID_RVOICE_FUNCTION(fluid_rvoice_set_samplemode);
DECLARE_FLUID_RVOICE_FUNCTION(fluid_rvoice_set_sample);
/* defined in fluid_rvoice_dsp.c */
void fluid_rvoice_dsp_config(void);
int fluid_rvoice_dsp_interpolate_none(fluid_rvoice_dsp_t *voice, fluid_real_t *FLUID_RESTRICT dsp_buf, int is_looping);
int fluid_rvoice_dsp_interpolate_linear(fluid_rvoice_dsp_t *voice, fluid_real_t *FLUID_RESTRICT dsp_buf, int is_looping);
int fluid_rvoice_dsp_interpolate_4th_order(fluid_rvoice_dsp_t *voice, fluid_real_t *FLUID_RESTRICT dsp_buf, int is_looping);
int fluid_rvoice_dsp_interpolate_7th_order(fluid_rvoice_dsp_t *voice, fluid_real_t *FLUID_RESTRICT dsp_buf, int is_looping);
/*
* Combines the most significant 16 bit part of a sample with a potentially present
* least sig. 8 bit part in order to create a 24 bit sample.
*/
static FLUID_INLINE int32_t
fluid_rvoice_get_sample(const short int *dsp_msb, const char *dsp_lsb, unsigned int idx)
{
/* cast sample to unsigned type, so we can safely shift and bitwise or
* without relying on undefined behaviour (should never happen anyway ofc...) */
uint32_t msb = (uint32_t)dsp_msb[idx];
uint8_t lsb = 0U;
/* most soundfonts have 16 bit samples, assume that it's unlikely we
* experience 24 bit samples here */
if(FLUID_UNLIKELY(dsp_lsb != NULL))
{
lsb = (uint8_t)dsp_lsb[idx];
}
return (int32_t)((msb << 8) | lsb);
}
#endif
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