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/* -*- linux-c -*-
Copyright (C) 2004 Tom Szilagyi
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
$Id: sound.c,v 1.5 2004/06/16 09:52:18 tszilagyi Exp $
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>
#include <unistd.h>
#include "tap_reverb_common.h"
#include "tap_reverb_file_io.h"
#include "tap_reverb.h"
/* ***** VERY IMPORTANT! *****
*
* If you enable this, the program will use float arithmetics in DSP
* calculations. This usually yields lower average CPU usage, but
* occasionaly may result in high CPU peaks which cause trouble to you
* and your JACK server. The default is to use fixpoint arithmetics
* (with the following #define commented out). But (depending on the
* processor on which you run the code) you may find floating point
* mode usable.
*/
/* #define REVERBED_CALC_FLOAT */
REVTYPE * curr = NULL ;
REVTYPE * reverb_root = NULL ;
/* magic numbers */
#define BANDPASS_BWIDTH 1.5f
#define FREQ_RESP_BWIDTH 3.0f
#define ENH_STEREO_RATIO 0.998f
/* compensation ratio of freq_resp in fb_gain calc */
#define FR_R_COMP 0.75f
#ifndef M_PI
#define M_PI 3.14159265358979323846264338327
#endif
#define db2lin(x) ((x) > -90.0f ? powf(10.0f, (x) * 0.05f) : 0.0f)
#define LN_2_2 0.34657359f
#define LIMIT(v,l,u) ((v)<(l)?(l):((v)>(u)?(u):(v)))
/* #define REVERB_INPUT_IS_LONGS */
#ifdef REVERBED_CALC_FLOAT
/* ultra-aggressive denormalization */
#define DENORM(x) (((unsigned char)(((*(unsigned int*)&(x))&0x7f800000)>>23))<103)?0.0f:(x)
typedef float rev_t;
#else
#ifdef REVERB_INPUT_IS_LONGS
/* coefficient for float to sample (signed int) conversion */
/* this allows for about 60 dB headroom above 0dB, if 0 dB is equivalent to 1.0f */
/* As 2^31 equals more than 180 dB, about 120 dB dynamics remains below 0 dB */
#define F2S 65
#else
/* coefficient for float to sample (signed int) conversion */
/* this allows for about 60 dB headroom above 0dB, if 0 dB is equivalent to 1.0f */
/* As 2^31 equals more than 180 dB, about 120 dB dynamics remains below 0 dB */
#define F2S 2147483
#endif
typedef signed int rev_t;
#endif
typedef struct {
float a1;
float a2;
float b0;
float b1;
float b2;
rev_t x1;
rev_t x2;
rev_t y1;
rev_t y2;
} biquad;
typedef struct {
float feedback;
float fb_gain;
float freq_resp;
rev_t ringbuffer[(int)MAX_COMB_DELAY * MAX_SAMPLERATE / 1000];
unsigned long buflen;
unsigned long buffer_pos;
biquad filter;
rev_t last_out;
} COMB_FILTER;
typedef struct {
float feedback;
float fb_gain;
float in_gain;
rev_t ringbuffer[(int)MAX_ALLP_DELAY * MAX_SAMPLERATE / 1000];
unsigned long buflen;
unsigned long buffer_pos;
rev_t last_out;
} ALLP_FILTER;
/* data of the running instance */
unsigned long num_combs; /* total number of comb filters */
unsigned long num_allps; /* total number of allpass filters */
COMB_FILTER combs[2 * MAX_COMBS];
ALLP_FILTER allps[2 * MAX_ALLPS];
biquad low_pass[2];
biquad high_pass[2];
float tap_decay = 2500.0f;
float drylevel = 0.0f;
float wetlevel = 0.0f;
int combs_en = 1; /* on/off */
int allps_en = 1; /* on/off */
int bandps_en = 1; /* on/off */
int stereo_en = 1; /* on/off */
int bypass = 0; /* on/off */
int changed_settings = 0;
/* additional data for the IR calculating instance */
COMB_FILTER combs_IR[MAX_COMBS];
ALLP_FILTER allps_IR[MAX_ALLPS];
biquad low_pass_IR;
biquad high_pass_IR;
unsigned long sample_rate;
void reverb_setup(long rate, double decay_d, double wet_d, double dry_d, char *name)
{
tap_decay = decay_d ;
wetlevel = wet_d ;
drylevel = dry_d ;
changed_settings = 1 ;
sample_rate = rate ;
if(reverb_root == NULL) {
reverb_root = parse_reverb_input_file() ;
}
curr = get_revtype_by_name(reverb_root, name) ;
reverb_init() ;
}
/* push a sample into a ringbuffer and return the sample falling out */
static inline
rev_t
push_buffer(rev_t insample, rev_t * buffer,
unsigned long buflen, unsigned long * pos) {
rev_t outsample;
outsample = buffer[*pos];
buffer[(*pos)++] = insample;
if (*pos >= buflen)
*pos = 0;
return outsample;
}
/* read a value from a ringbuffer. */
static inline
rev_t
read_buffer(rev_t * buffer, unsigned long buflen,
unsigned long pos, unsigned long n) {
while (n + pos >= buflen)
n -= buflen;
return buffer[n + pos];
}
/* overwrites a value in a ringbuffer, but pos stays the same. */
static inline
void
write_buffer(rev_t insample, rev_t * buffer, unsigned long buflen,
unsigned long pos, unsigned long n) {
while (n + pos >= buflen)
n -= buflen;
buffer[n + pos] = insample;
}
static inline
void
biquad_init(biquad *f) {
f->x1 = 0.0f;
f->x2 = 0.0f;
f->y1 = 0.0f;
f->y2 = 0.0f;
}
static inline
void
lp_set_params(biquad *f, float fc, float bw, float fs) {
float omega = 2.0 * M_PI * fc/fs;
float sn = sin(omega);
float cs = cos(omega);
float alpha = sn * sinh(M_LN2 / 2.0 * bw * omega / sn);
const float a0r = 1.0 / (1.0 + alpha);
f->b0 = a0r * (1.0 - cs) * 0.5;
f->b1 = a0r * (1.0 - cs);
f->b2 = a0r * (1.0 - cs) * 0.5;
f->a1 = a0r * (2.0 * cs);
f->a2 = a0r * (alpha - 1.0);
}
static inline
void
hp_set_params(biquad *f, float fc, float bw, float fs) {
float omega = 2.0 * M_PI * fc/fs;
float sn = sin(omega);
float cs = cos(omega);
float alpha = sn * sinh(M_LN2 / 2.0 * bw * omega / sn);
const float a0r = 1.0 / (1.0 + alpha);
f->b0 = a0r * (1.0 + cs) * 0.5;
f->b1 = a0r * -(1.0 + cs);
f->b2 = a0r * (1.0 + cs) * 0.5;
f->a1 = a0r * (2.0 * cs);
f->a2 = a0r * (alpha - 1.0);
}
static inline
rev_t
biquad_run(biquad *f, rev_t x) {
rev_t y;
y = f->b0 * x + f->b1 * f->x1 + f->b2 * f->x2
+ f->a1 * f->y1 + f->a2 * f->y2;
#ifdef REVERBED_CALC_FLOAT
y = DENORM(y);
#endif
f->x2 = f->x1;
f->x1 = x;
f->y2 = f->y1;
f->y1 = y;
return y;
}
/* push a sample into a comb filter and return the sample falling out */
rev_t
comb_run(rev_t insample, COMB_FILTER * comb) {
rev_t outsample;
rev_t pushin;
pushin = comb->fb_gain * insample + biquad_run(&(comb->filter), comb->fb_gain * comb->last_out);
#ifdef REVERBED_CALC_FLOAT
pushin = DENORM(pushin);
#endif
outsample = push_buffer(pushin, comb->ringbuffer, comb->buflen, &(comb->buffer_pos));
#ifdef REVERBED_CALC_FLOAT
outsample = DENORM(outsample);
#endif
comb->last_out = outsample;
return outsample;
}
/* push a sample into an allpass filter and return the sample falling out */
rev_t
allp_run(rev_t insample, ALLP_FILTER * allp) {
rev_t outsample;
rev_t pushin;
pushin = allp->in_gain * allp->fb_gain * insample + allp->fb_gain * allp->last_out;
#ifdef REVERBED_CALC_FLOAT
pushin = DENORM(pushin);
#endif
outsample = push_buffer(pushin, allp->ringbuffer, allp->buflen, &(allp->buffer_pos));
#ifdef REVERBED_CALC_FLOAT
outsample = DENORM(outsample);
#endif
allp->last_out = outsample;
return outsample;
}
/* load data from REVTYPE*curr into the running instance */
void
load_revtype_data(void) {
int i;
/* load combs data */
num_combs = 2 * curr->num_combs;
for (i = 0; i < curr->num_combs; i++) {
combs[2*i].buflen = curr->combs_data[3*i] * sample_rate / 1000.0f;
combs[2*i].feedback = curr->combs_data[3*i+1];
combs[2*i].freq_resp = LIMIT(curr->combs_data[3*i+2]
* powf(sample_rate / 44100.0f, 0.8f),
0.0f, 1.0f);
combs[2*i+1].buflen = combs[2*i].buflen;
combs[2*i+1].feedback = combs[2*i].feedback;
combs[2*i+1].freq_resp = combs[2*i].freq_resp;
lp_set_params(&(combs[2*i].filter),
2000.0f + 13000.0f * (1 - curr->combs_data[3*i+2])
* sample_rate / 44100.0f,
BANDPASS_BWIDTH, sample_rate);
lp_set_params(&(combs[2*i+1].filter),
2000.0f + 13000.0f * (1 - curr->combs_data[3*i+2])
* sample_rate / 44100.0f,
BANDPASS_BWIDTH, sample_rate);
}
/* load allps data */
num_allps = 2 * curr->num_allps;
for (i = 0; i < curr->num_allps; i++) {
allps[2*i].buflen = curr->allps_data[2*i] * sample_rate / 1000.0f;
allps[2*i].feedback = curr->allps_data[2*i+1];
allps[2*i+1].buflen = allps[2*i].buflen;
allps[2*i+1].feedback = allps[2*i].feedback;
}
/* init bandpass filters */
lp_set_params(&(low_pass[0]), curr->bandps_hi, BANDPASS_BWIDTH, sample_rate);
hp_set_params(&(high_pass[0]), curr->bandps_lo, BANDPASS_BWIDTH, sample_rate);
lp_set_params(&(low_pass[1]), curr->bandps_hi, BANDPASS_BWIDTH, sample_rate);
hp_set_params(&(high_pass[1]), curr->bandps_lo, BANDPASS_BWIDTH, sample_rate);
}
/* compute user-input-dependent reverberator coefficients */
void
comp_coeffs(void) {
int i;
for (i = 0; i < num_combs / 2; i++) {
combs[2*i].fb_gain = powf(0.001f, 1000.0f * combs[2*i].buflen
* (1 + FR_R_COMP * combs[2*i].freq_resp)
/ powf(combs[2*i].feedback / 100.0f, 0.89f)
/ tap_decay / sample_rate);
combs[2*i+1].fb_gain = combs[2*i].fb_gain;
if (stereo_en) {
if (i % 2 == 0)
combs[2*i+1].buflen = ENH_STEREO_RATIO * combs[2*i].buflen;
else
combs[2*i].buflen = ENH_STEREO_RATIO * combs[2*i+1].buflen;
} else {
if (i % 2 == 0)
combs[2*i+1].buflen = combs[2*i].buflen;
else
combs[2*i].buflen = combs[2*i+1].buflen;
}
}
for (i = 0; i < num_allps / 2; i++) {
allps[2*i].fb_gain = powf(0.001f, 11000.0f * allps[2*i].buflen
/ powf(allps[2*i].feedback / 100.0f, 0.88f)
/ tap_decay / sample_rate);
allps[2*i+1].fb_gain = allps[2*i].fb_gain;
allps[2*i].in_gain = -0.06f
/ (allps[2*i].feedback / 100.0f)
/ powf((tap_decay + 3500.0f) / 10000.0f, 1.5f);
allps[2*i+1].in_gain = allps[2*i].in_gain;
if (stereo_en) {
if (i % 2 == 0)
allps[2*i+1].buflen =
ENH_STEREO_RATIO * ENH_STEREO_RATIO * allps[2*i].buflen;
else
allps[2*i].buflen =
ENH_STEREO_RATIO * ENH_STEREO_RATIO * allps[2*i+1].buflen;
} else {
if (i % 2 == 0)
allps[2*i+1].buflen = allps[2*i].buflen;
else
allps[2*i].buflen = allps[2*i+1].buflen;
}
}
}
void reverb_init(void) {
unsigned long i,j;
for (i = 0; i < 2 * MAX_COMBS; i++) {
for (j = 0; j < (unsigned long)MAX_COMB_DELAY * sample_rate / 1000; j++)
combs[i].ringbuffer[j] = 0.0f;
combs[i].buffer_pos = 0;
combs[i].last_out = 0.0f;
biquad_init(&(combs[i].filter));
}
for (i = 0; i < 2 * MAX_ALLPS; i++) {
for (j = 0; j < (unsigned long)MAX_ALLP_DELAY * sample_rate / 1000; j++)
allps[i].ringbuffer[j] = 0.0f;
allps[i].buffer_pos = 0;
allps[i].last_out = 0.0f;
}
biquad_init(&(low_pass[0]));
biquad_init(&(low_pass[1]));
biquad_init(&(high_pass[0]));
biquad_init(&(high_pass[1]));
}
int
reverb_process(long nframes, reverb_audio_sample_t *output_L, reverb_audio_sample_t *input_L, reverb_audio_sample_t *output_R, reverb_audio_sample_t *input_R) {
unsigned long sample_index;
int i;
rev_t out_L = 0;
rev_t out_R = 0;
rev_t in_L = 0;
rev_t in_R = 0;
rev_t combs_out_L = 0;
rev_t combs_out_R = 0;
float dry = db2lin(drylevel);
float wet = db2lin(wetlevel);
if (bypass) {
memcpy(output_L, input_L, sizeof(reverb_audio_sample_t) * nframes);
memcpy(output_R, input_R, sizeof(reverb_audio_sample_t) * nframes);
} else {
if (changed_settings) {
load_revtype_data();
comp_coeffs();
changed_settings = 0;
}
for (sample_index = 0; sample_index < nframes; sample_index++) {
#ifdef REVERBED_CALC_FLOAT
in_L = *(input_L++);
in_R = *(input_R++);
#else
in_L = (float)F2S * *(input_L++);
in_R = (float)F2S * *(input_R++);
#endif
combs_out_L = in_L;
combs_out_R = in_R;
/* process comb filters */
if (combs_en) {
for (i = 0; i < num_combs / 2; i++) {
combs_out_L += comb_run(in_L, &(combs[2*i]));
combs_out_R += comb_run(in_R, &(combs[2*i+1]));
}
}
/* process allpass filters */
if (allps_en) {
for (i = 0; i < num_allps / 2; i++) {
combs_out_L += allp_run(combs_out_L, &(allps[2*i]));
combs_out_R += allp_run(combs_out_R, &(allps[2*i+1]));
}
}
/* process bandpass filters */
if (bandps_en) {
combs_out_L = biquad_run(&(low_pass[0]), combs_out_L);
combs_out_L = biquad_run(&(high_pass[0]), combs_out_L);
combs_out_R = biquad_run(&(low_pass[1]), combs_out_R);
combs_out_R = biquad_run(&(high_pass[1]), combs_out_R);
}
#ifdef REVERBED_CALC_FLOAT
out_L = in_L * dry + combs_out_L * wet;
out_R = in_R * dry + combs_out_R * wet;
*(output_L++) = out_L;
*(output_R++) = out_R;
#else
out_L = (float)in_L * dry + (float)combs_out_L * wet;
out_R = (float)in_R * dry + (float)combs_out_R * wet;
*(output_L++) = (float)out_L / (float)F2S;
*(output_R++) = (float)out_R / (float)F2S;
#endif
}
}
return 0;
}
void
process_impresp(float * data, long int nframes) {
unsigned long sample_index;
rev_t out = 0;
rev_t in = 0;
rev_t combs_out = 0;
float * output = data;
float * input = data;
unsigned long i,j;
/* make sure the running instance has current data,
even if due to some accident JACK is not running */
if (changed_settings) {
load_revtype_data();
comp_coeffs();
changed_settings = 0;
}
/* init IR calc. instance */
for (i = 0; i < MAX_COMBS; i++) {
for (j = 0; j < (unsigned long)MAX_COMB_DELAY * sample_rate / 1000; j++)
combs_IR[i].ringbuffer[j] = 0.0f;
combs_IR[i].buffer_pos = 0;
combs_IR[i].last_out = 0.0f;
biquad_init(&(combs_IR[i].filter));
}
for (i = 0; i < MAX_ALLPS; i++) {
for (j = 0; j < (unsigned long)MAX_ALLP_DELAY * sample_rate / 1000; j++)
allps_IR[i].ringbuffer[j] = 0.0f;
allps_IR[i].buffer_pos = 0;
allps_IR[i].last_out = 0.0f;
}
biquad_init(&low_pass_IR);
biquad_init(&high_pass_IR);
/* load parameters */
for (i = 0; i < curr->num_combs; i++) {
combs_IR[i].buflen = combs[2*i].buflen;
combs_IR[i].feedback = combs[2*i].feedback;
combs_IR[i].fb_gain = combs[2*i].fb_gain;
combs_IR[i].freq_resp = combs[2*i].freq_resp;
combs_IR[i].filter.a1 = combs[2*i].filter.a1;
combs_IR[i].filter.a2 = combs[2*i].filter.a2;
combs_IR[i].filter.b0 = combs[2*i].filter.b0;
combs_IR[i].filter.b1 = combs[2*i].filter.b1;
combs_IR[i].filter.b2 = combs[2*i].filter.b2;
}
for (i = 0; i < curr->num_allps; i++) {
allps_IR[i].buflen = allps[2*i].buflen;
allps_IR[i].feedback = allps[2*i].feedback;
allps_IR[i].fb_gain = allps[2*i].fb_gain;
allps_IR[i].in_gain = allps[2*i].in_gain;
}
low_pass_IR.a1 = low_pass[0].a1;
low_pass_IR.a2 = low_pass[0].a2;
low_pass_IR.b0 = low_pass[0].b0;
low_pass_IR.b1 = low_pass[0].b1;
low_pass_IR.b2 = low_pass[0].b2;
high_pass_IR.a1 = high_pass[0].a1;
high_pass_IR.a2 = high_pass[0].a2;
high_pass_IR.b0 = high_pass[0].b0;
high_pass_IR.b1 = high_pass[0].b1;
high_pass_IR.b2 = high_pass[0].b2;
/* process */
for (sample_index = 0; sample_index < nframes; sample_index++) {
#ifdef REVERBED_CALC_FLOAT
in = *(input++);
#else
in = (float)F2S * *(input++);
#endif
combs_out = in;
if (combs_en) {
for (i = 0; i < curr->num_combs; i++) {
combs_out += comb_run(in, &(combs_IR[i]));
}
}
if (allps_en) {
for (i = 0; i < curr->num_allps; i++) {
combs_out += allp_run(combs_out, &(allps_IR[i]));
}
}
if (bandps_en) {
combs_out = biquad_run(&low_pass_IR, combs_out);
combs_out = biquad_run(&high_pass_IR, combs_out);
}
out = combs_out;
#ifdef REVERBED_CALC_FLOAT
*(output++) = out;
#else
*(output++) = (float)out / (float)F2S;
#endif
}
}
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