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livetrax/libs/plugins/a-exp.lv2/a-exp.c

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/* a-exp
* Copyright (C) 2017 Johannes Mueller <github@johannes-mueller.org>
* based on a-comp (C) 2016 Damien Zammit <damien@zamaudio.com>
*
* 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.
*/
#include <math.h>
#include <stdlib.h>
#include <string.h>
#include <stdbool.h>
#ifdef LV2_EXTENDED
#include <cairo/cairo.h>
#include "ardour/lv2_extensions.h"
#endif
#include "lv2/lv2plug.in/ns/lv2core/lv2.h"
#define AEXP_URI "urn:ardour:a-exp"
#define AEXP_STEREO_URI "urn:ardour:a-exp#stereo"
#define RESET_PEAK_AFTER_SECONDS 3
#ifndef M_PI
# define M_PI 3.14159265358979323846
#endif
#ifdef COMPILER_MSVC
#include <float.h>
#define isfinite_local(val) (bool)_finite((double)val)
#else
#define isfinite_local isfinite
#endif
#ifndef FLT_EPSILON
# define FLT_EPSILON 1.192093e-07
#endif
typedef enum {
AEXP_ATTACK = 0,
AEXP_RELEASE,
AEXP_KNEE,
AEXP_RATIO,
AEXP_THRESHOLD,
AEXP_MAKEUP,
AEXP_GAINR,
AEXP_INLEVEL,
AEXP_OUTLEVEL,
AEXP_SIDECHAIN,
AEXP_ENABLE,
AEXP_A0,
AEXP_A1,
AEXP_A2,
AEXP_A3,
AEXP_A4,
} PortIndex;
typedef struct {
float* attack;
float* release;
float* knee;
float* ratio;
float* thresdb;
float* makeup;
float* gainr;
float* outlevel;
float* inlevel;
float* sidechain;
float* enable;
float* input0;
float* input1;
float* sc;
float* output0;
float* output1;
uint32_t n_channels;
float srate;
float makeup_gain;
bool was_disabled;
#ifdef LV2_EXTENDED
LV2_Inline_Display_Image_Surface surf;
bool need_expose;
cairo_surface_t* display;
LV2_Inline_Display* queue_draw;
uint32_t w, h;
/* ports pointers are only valid during run so we'll
* have to cache them for the display, besides
* we do want to check for changes
*/
float v_knee;
float v_ratio;
float v_thresdb;
float v_gainr;
float v_makeup;
float v_lvl_in;
float v_lvl_out;
float v_peakdb;
uint32_t peakdb_samples;
#endif
} AExp;
static LV2_Handle
instantiate(const LV2_Descriptor* descriptor,
double rate,
const char* bundle_path,
const LV2_Feature* const* features)
{
AExp* aexp = (AExp*)calloc(1, sizeof(AExp));
if (!strcmp (descriptor->URI, AEXP_URI)) {
aexp->n_channels = 1;
} else if (!strcmp (descriptor->URI, AEXP_STEREO_URI)) {
aexp->n_channels = 2;
} else {
free (aexp);
return NULL;
}
for (int i=0; features[i]; ++i) {
#ifdef LV2_EXTENDED
if (!strcmp(features[i]->URI, LV2_INLINEDISPLAY__queue_draw)) {
aexp->queue_draw = (LV2_Inline_Display*) features[i]->data;
}
#endif
}
aexp->srate = rate;
#ifdef LV2_EXTENDED
aexp->need_expose = true;
aexp->v_lvl_out = -70.f;
#endif
return (LV2_Handle)aexp;
}
static void
connect_port(LV2_Handle instance,
uint32_t port,
void* data)
{
AExp* aexp = (AExp*)instance;
switch ((PortIndex)port) {
case AEXP_ATTACK:
aexp->attack = (float*)data;
break;
case AEXP_RELEASE:
aexp->release = (float*)data;
break;
case AEXP_KNEE:
aexp->knee = (float*)data;
break;
case AEXP_RATIO:
aexp->ratio = (float*)data;
break;
case AEXP_THRESHOLD:
aexp->thresdb = (float*)data;
break;
case AEXP_MAKEUP:
aexp->makeup = (float*)data;
break;
case AEXP_GAINR:
aexp->gainr = (float*)data;
break;
case AEXP_OUTLEVEL:
aexp->outlevel = (float*)data;
break;
case AEXP_INLEVEL:
aexp->inlevel = (float*)data;
break;
case AEXP_SIDECHAIN:
aexp->sidechain = (float*)data;
break;
case AEXP_ENABLE:
aexp->enable = (float*)data;
break;
default:
break;
}
}
static void
connect_mono(LV2_Handle instance,
uint32_t port,
void* data)
{
AExp* aexp = (AExp*)instance;
connect_port (instance, port, data);
switch ((PortIndex)port) {
case AEXP_A0:
aexp->input0 = (float*)data;
break;
case AEXP_A1:
aexp->sc = (float*)data;
break;
case AEXP_A2:
aexp->output0 = (float*)data;
break;
default:
break;
}
}
static void
connect_stereo(LV2_Handle instance,
uint32_t port,
void* data)
{
AExp* aexp = (AExp*)instance;
connect_port (instance, port, data);
switch ((PortIndex)port) {
case AEXP_A0:
aexp->input0 = (float*)data;
break;
case AEXP_A1:
aexp->input1 = (float*)data;
break;
case AEXP_A2:
aexp->sc = (float*)data;
break;
case AEXP_A3:
aexp->output0 = (float*)data;
break;
case AEXP_A4:
aexp->output1 = (float*)data;
break;
default:
break;
}
}
// Force already-denormal float value to zero
static inline float
sanitize_denormal(float value) {
if (!isnormal(value)) {
value = 0.f;
}
return value;
}
static inline float
from_dB(float gdb) {
return (exp(gdb/20.f*log(10.f)));
}
static inline float
to_dB(float g) {
return (20.f*log10(g));
}
static void
activate(LV2_Handle instance)
{
AExp* aexp = (AExp*)instance;
*(aexp->gainr) = 160.0f;
*(aexp->outlevel) = -45.0f;
*(aexp->inlevel) = -45.0f;
#ifdef LV2_EXTENDED
aexp->v_peakdb = -160.f;
aexp->peakdb_samples = 0;
#endif
}
static void
run(LV2_Handle instance, uint32_t n_samples)
{
AExp* aexp = (AExp*)instance;
const float* const ins[2] = { aexp->input0, aexp->input1 };
const float* const sc = aexp->sc;
float* const outs[2] = { aexp->output0, aexp->output1 };
float srate = aexp->srate;
float width = (6.f * *(aexp->knee)) + 0.01;
float attack_coeff = exp(-1000.f/(*(aexp->attack) * srate));
float release_coeff = exp(-1000.f/(*(aexp->release) * srate));
float max_out = 0.f;
float Lgain = 1.f;
float Lxg, Lyg;
float current_gainr;
float old_gainr = *aexp->gainr;
int usesidechain = (*(aexp->sidechain) <= 0.f) ? 0 : 1;
uint32_t i;
float ingain;
float sc0;
float maxabs;
uint32_t n_channels = aexp->n_channels;
float ratio = *aexp->ratio;
float thresdb = *aexp->thresdb;
float makeup = *aexp->makeup;
float makeup_target = from_dB(makeup);
float makeup_gain = aexp->makeup_gain;
const float tau = (1.0 - exp (-2.f * M_PI * 25.f / aexp->srate));
if (*aexp->enable <= 0) {
ratio = 1.f;
thresdb = 0.f;
makeup = 0.f;
makeup_target = 1.f;
if (!aexp->was_disabled) {
*aexp->gainr = 0.f;
aexp->was_disabled = true;
}
} else {
if (aexp->was_disabled) {
*aexp->gainr = 160.f;
aexp->was_disabled = false;
}
}
#ifdef LV2_EXTENDED
if (aexp->v_knee != *aexp->knee) {
aexp->v_knee = *aexp->knee;
aexp->need_expose = true;
}
if (aexp->v_ratio != ratio) {
aexp->v_ratio = ratio;
aexp->need_expose = true;
}
if (aexp->v_thresdb != thresdb) {
aexp->v_thresdb = thresdb;
aexp->need_expose = true;
}
if (aexp->v_makeup != makeup) {
aexp->v_makeup = makeup;
aexp->need_expose = true;
}
#endif
float in_peak_db = -160.f;
float max_gainr = 0.0;
for (i = 0; i < n_samples; i++) {
maxabs = 0.f;
for (uint32_t c=0; c<n_channels; ++c) {
maxabs = fmaxf(fabsf(ins[c][i]), maxabs);
}
sc0 = sc[i];
ingain = usesidechain ? fabs(sc0) : maxabs;
Lyg = 0.f;
Lxg = (ingain==0.f) ? -160.f : to_dB(ingain);
Lxg = sanitize_denormal(Lxg);
if (Lxg > in_peak_db) {
in_peak_db = Lxg;
}
if (2.f*(Lxg-thresdb) < -width) {
Lyg = thresdb + (Lxg-thresdb) * ratio;
Lyg = sanitize_denormal(Lyg);
} else if (2.f*(Lxg-thresdb) > width) {
Lyg = Lxg;
} else {
Lyg = Lxg + (1.f-ratio)*(Lxg-thresdb-width/2.f)*(Lxg-thresdb-width/2.f)/(2.f*width);
}
current_gainr = Lxg - Lyg;
if (current_gainr > 160.f) {
current_gainr = 160.f;
}
if (current_gainr > old_gainr) {
current_gainr = release_coeff*old_gainr + (1.f-release_coeff)*current_gainr;
} else if (current_gainr < old_gainr) {
current_gainr = attack_coeff*old_gainr + (1.f-attack_coeff)*current_gainr;
}
current_gainr = sanitize_denormal(current_gainr);
Lgain = from_dB(-current_gainr);
old_gainr = current_gainr;
*(aexp->gainr) = current_gainr;
if (current_gainr > max_gainr) {
max_gainr = current_gainr;
}
makeup_gain += tau * (makeup_target - makeup_gain);
for (uint32_t c=0; c<n_channels; ++c) {
float out = ins[c][i] * Lgain * makeup_gain;
outs[c][i] = out;
out = fabsf (out);
if (out > max_out) {
max_out = out;
sanitize_denormal(max_out);
}
}
}
if (fabsf(tau * (makeup_gain - makeup_target)) < FLT_EPSILON*makeup_gain) {
makeup_gain = makeup_target;
}
*(aexp->outlevel) = (max_out < 0.0056f) ? -45.f : to_dB(max_out);
*(aexp->inlevel) = in_peak_db;
aexp->makeup_gain = makeup_gain;
#ifdef LV2_EXTENDED
if (in_peak_db > aexp->v_peakdb) {
aexp->v_peakdb = in_peak_db;
aexp->peakdb_samples = 0;
} else {
aexp->peakdb_samples += n_samples;
if ((float)aexp->peakdb_samples/aexp->srate > RESET_PEAK_AFTER_SECONDS) {
aexp->v_peakdb = in_peak_db;
aexp->peakdb_samples = 0;
aexp->need_expose = true;
}
}
const float v_lvl_out = (max_out < 0.001f) ? -1600.f : to_dB(max_out);
const float v_lvl_in = in_peak_db;
if (fabsf (aexp->v_lvl_out - v_lvl_out) >= .1 ||
fabsf (aexp->v_lvl_in - v_lvl_in) >= .1 ||
fabsf (aexp->v_gainr - max_gainr) >= .1) {
// >= 0.1dB difference
aexp->need_expose = true;
aexp->v_lvl_in = v_lvl_in;
aexp->v_lvl_out = v_lvl_out;
aexp->v_gainr = max_gainr;
}
if (aexp->need_expose && aexp->queue_draw) {
aexp->need_expose = false;
aexp->queue_draw->queue_draw (aexp->queue_draw->handle);
}
#endif
}
static void
deactivate(LV2_Handle instance)
{
activate(instance);
}
static void
cleanup(LV2_Handle instance)
{
#ifdef LV2_EXTENDED
AExp* aexp = (AExp*)instance;
if (aexp->display) {
cairo_surface_destroy (aexp->display);
}
#endif
free(instance);
}
#ifndef MIN
#define MIN(A,B) ((A) < (B)) ? (A) : (B)
#endif
#ifdef LV2_EXTENDED
static float
exp_curve (const AExp* self, float xg) {
const float knee = self->v_knee;
const float ratio = self->v_ratio;
const float thresdb = self->v_thresdb;
const float makeup = self->v_makeup;
const float width = 6.f * knee + 0.01f;
float yg = 0.f;
if (2.f * (xg - thresdb) < -width) {
yg = thresdb + (xg - thresdb) * ratio;
} else if (2.f * (xg - thresdb) > width) {
yg = xg;
} else {
yg = xg + (1.f - ratio) * (xg - thresdb - width / 2.f) * (xg - thresdb - width / 2.f) / (2.f * width);
}
yg += makeup;
return yg;
}
#include "dynamic_display.c"
static void
render_inline_full (cairo_t* cr, const AExp* self)
{
const float w = self->w;
const float h = self->h;
const float makeup_thres = self->v_thresdb + self->v_makeup;
draw_grid (cr, w,h);
if (self->v_thresdb < 0) {
const float y = -.5 + floorf (h * ((makeup_thres - 10.f) / -70.f));
cairo_move_to (cr, 0, y);
cairo_line_to (cr, w, y);
cairo_stroke (cr);
}
draw_GR_bar (cr, w,h, self->v_gainr);
// draw peak input
cairo_set_source_rgba (cr, .8, .8, .8, 1.0);
cairo_set_line_width(cr, 1.0);
const float peak_x = w * (1.f - (10.f-self->v_peakdb)/70.f);
const float peak_y = fminf (h * (exp_curve (self, self->v_peakdb) - 10.f) / -70.f, h);
cairo_arc (cr, peak_x, peak_y, 3.f, 0.f, 2.f*M_PI);
cairo_fill (cr);
// draw curve
cairo_set_source_rgba (cr, .8, .8, .8, 1.0);
cairo_move_to (cr, 0, h);
for (uint32_t x = 0; x < w; ++x) {
// plot -60..+10 dB
const float x_db = 70.f * (-1.f + x / (float)w) + 10.f;
const float y_db = exp_curve (self, x_db) - 10.f;
const float y = h * (y_db / -70.f);
cairo_line_to (cr, x, y);
}
cairo_stroke_preserve (cr);
cairo_line_to (cr, w, h);
cairo_close_path (cr);
cairo_clip (cr);
// draw signal level & reduction/gradient
const float top = exp_curve (self, 0) - 10.f;
cairo_pattern_t* pat = cairo_pattern_create_linear (0.0, 0.0, 0.0, h);
if (top > makeup_thres - 10.f) {
cairo_pattern_add_color_stop_rgba (pat, 0.0, 0.8, 0.1, 0.1, 0.5);
cairo_pattern_add_color_stop_rgba (pat, top / -70.f, 0.8, 0.1, 0.1, 0.5);
}
if (self->v_knee > 0) {
cairo_pattern_add_color_stop_rgba (pat, ((makeup_thres -10.f) / -70.f), 0.7, 0.7, 0.2, 0.5);
cairo_pattern_add_color_stop_rgba (pat, ((makeup_thres - self->v_knee - 10.f) / -70.f), 0.5, 0.5, 0.5, 0.5);
} else {
cairo_pattern_add_color_stop_rgba (pat, ((makeup_thres - 10.f)/ -70.f), 0.7, 0.7, 0.2, 0.5);
cairo_pattern_add_color_stop_rgba (pat, ((makeup_thres - 10.01f) / -70.f), 0.5, 0.5, 0.5, 0.5);
}
cairo_pattern_add_color_stop_rgba (pat, 1.0, 0.5, 0.5, 0.5, 0.5);
// maybe cut off at x-position?
const float x = w * (self->v_lvl_in + 60) / 70.f;
const float y = x + h*self->v_makeup;
cairo_rectangle (cr, 0, h - y, x, y);
if (self->v_ratio > 1.0) {
cairo_set_source (cr, pat);
} else {
cairo_set_source_rgba (cr, 0.5, 0.5, 0.5, 0.5);
}
cairo_fill (cr);
cairo_pattern_destroy (pat); // TODO cache pattern
}
static void
render_inline_only_bars (cairo_t* cr, const AExp* self)
{
draw_inline_bars (cr, self->w, self->h,
self->v_thresdb, self->v_ratio,
self->v_peakdb, self->v_gainr,
self->v_lvl_in, self->v_lvl_out);
}
static LV2_Inline_Display_Image_Surface *
render_inline (LV2_Handle instance, uint32_t w, uint32_t max_h)
{
AExp* self = (AExp*)instance;
uint32_t h = MIN (w, max_h);
if (w < 200) {
h = 40;
}
if (!self->display || self->w != w || self->h != h) {
if (self->display) cairo_surface_destroy(self->display);
self->display = cairo_image_surface_create (CAIRO_FORMAT_ARGB32, w, h);
self->w = w;
self->h = h;
}
cairo_t* cr = cairo_create (self->display);
if (w >= 200) {
render_inline_full (cr, self);
} else {
render_inline_only_bars (cr, self);
}
cairo_destroy (cr);
cairo_surface_flush (self->display);
self->surf.width = cairo_image_surface_get_width (self->display);
self->surf.height = cairo_image_surface_get_height (self->display);
self->surf.stride = cairo_image_surface_get_stride (self->display);
self->surf.data = cairo_image_surface_get_data (self->display);
return &self->surf;
}
#endif
static const void*
extension_data(const char* uri)
{
#ifdef LV2_EXTENDED
static const LV2_Inline_Display_Interface display = { render_inline };
if (!strcmp(uri, LV2_INLINEDISPLAY__interface)) {
return &display;
}
#endif
return NULL;
}
static const LV2_Descriptor descriptor_mono = {
AEXP_URI,
instantiate,
connect_mono,
activate,
run,
deactivate,
cleanup,
extension_data
};
static const LV2_Descriptor descriptor_stereo = {
AEXP_STEREO_URI,
instantiate,
connect_stereo,
activate,
run,
deactivate,
cleanup,
extension_data
};
LV2_SYMBOL_EXPORT
const LV2_Descriptor*
lv2_descriptor(uint32_t index)
{
switch (index) {
case 0:
return &descriptor_mono;
case 1:
return &descriptor_stereo;
default:
return NULL;
}
}
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