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#include "effect_compressor.h"
#include "dsp/db.h"
#include <math.h>
//process
bool AudioEffectCompressor::has_secondary_input() const {
return sidechain;
}
void AudioEffectCompressor::process(const Event *p_events, int p_event_count, const AudioFrame *p_in, AudioFrame *p_out, bool p_prev_active) {
process_with_secondary(p_events, p_event_count, p_in, NULL, p_out, p_prev_active);
}
void AudioEffectCompressor::process_with_secondary(const Event *p_events, int p_event_count, const AudioFrame *p_in, const AudioFrame *p_secondary, AudioFrame *p_out, bool p_prev_active) {
float threshold = db2linear(control_ports[CONTROL_PORT_THRESHOLD_DB].value);
float sample_rate = sampling_rate;
float ratatcoef = exp(-1 / (0.00001f * sample_rate));
float ratrelcoef = exp(-1 / (0.5f * sample_rate));
float attime = control_ports[CONTROL_PORT_ATTACK_MS].value / 1000.0;
float reltime = control_ports[CONTROL_PORT_RELEASE_MS].value / 1000.0;
float atcoef = exp(-1 / (attime * sample_rate));
float relcoef = exp(-1 / (reltime * sample_rate));
float pre = db2linear(control_ports[CONTROL_PORT_PRE_GAIN_DB].value);
float makeup = db2linear(control_ports[CONTROL_PORT_POST_GAIN_DB].value);
float mix = control_ports[CONTROL_PORT_MIX].value;
float gr_meter_decay = exp(1 / (1 * sample_rate));
float ratio = control_ports[CONTROL_PORT_RATIO].value;
for (int i = 0; i < block_size; i++) {
AudioFrame s = p_in[i];
s *= pre;
//convert to positive
s.l = abs(s.l);
s.r = abs(s.r);
float peak = MAX(s.l, s.r);
float overdb = 2.08136898f * linear2db(peak / threshold);
if (overdb < 0.0) //we only care about what goes over to compress
overdb = 0.0;
if (overdb - rundb > 5) // diffeence is too large
averatio = 4;
if (overdb > rundb) {
rundb = overdb + atcoef * (rundb - overdb);
runratio = averatio + ratatcoef * (runratio - averatio);
} else {
rundb = overdb + relcoef * (rundb - overdb);
runratio = averatio + ratrelcoef * (runratio - averatio);
}
overdb = rundb;
averatio = runratio;
float cratio;
if (false) { //rato all-in
cratio = 12 + averatio;
} else {
cratio = ratio;
}
float gr = -overdb * (cratio - 1) / cratio;
float grv = db2linear(gr);
runmax = maxover + relcoef * (runmax - maxover); // highest peak for setting att/rel decays in reltime
maxover = runmax;
if (grv < gr_meter) {
gr_meter = grv;
} else {
gr_meter *= gr_meter_decay;
if (gr_meter > 1)
gr_meter = 1;
}
if (p_secondary) {
p_out[i] = p_secondary[i] * grv * makeup * mix + p_secondary[i] * (1.0 - mix);
p_out[i] += p_in[i];
} else {
p_out[i] = p_in[i] * grv * makeup * mix + p_in[i] * (1.0 - mix);
}
}
}
void AudioEffectCompressor::set_process_block_size(int p_size) {
block_size = p_size;
}
void AudioEffectCompressor::set_sampling_rate(int p_hz) {
if (sampling_rate != p_hz) {
sampling_rate = p_hz;
_update_buffers();
}
}
//info
String AudioEffectCompressor::get_name() const {
return sidechain ? "Compressor (SideC)" : "Compressor";
}
String AudioEffectCompressor::get_unique_id() const {
return sidechain ? "sc_compressor" : "compressor";
}
String AudioEffectCompressor::get_provider_id() const {
return "internal";
}
int AudioEffectCompressor::get_control_port_count() const {
return CONTROL_PORT_MAX;
}
ControlPort *AudioEffectCompressor::get_control_port(int p_port) {
ERR_FAIL_INDEX_V(p_port, CONTROL_PORT_MAX, NULL);
return &control_ports[p_port];
}
void AudioEffectCompressor::reset() {
_update_buffers();
}
/* Load/Save */
JSON::Node AudioEffectCompressor::to_json() const {
JSON::Node node = JSON::object();
for (int i = 0; i < CONTROL_PORT_MAX; i++) {
node.add(control_ports[i].identifier.utf8().get_data(), control_ports[i].value);
}
return node;
}
Error AudioEffectCompressor::from_json(const JSON::Node &node) {
for (int i = 0; i < CONTROL_PORT_MAX; i++) {
std::string key = control_ports[i].identifier.utf8().get_data();
if (node.has(key)) {
control_ports[i].value = node.get(key).toFloat();
}
}
return OK;
}
void AudioEffectCompressor::_update_buffers() {
rundb = 0;
runratio = 0;
averatio = 0;
runmax = 0;
maxover = 0;
gr_meter = 1.0;
current_channel = -1;
}
AudioEffectCompressor::AudioEffectCompressor(bool p_sidechain) {
sidechain = p_sidechain;
control_ports[CONTROL_PORT_PRE_GAIN_DB].name = "Pre Gain (db)";
control_ports[CONTROL_PORT_PRE_GAIN_DB].identifier = "pre_gain";
control_ports[CONTROL_PORT_PRE_GAIN_DB].min = -24;
control_ports[CONTROL_PORT_PRE_GAIN_DB].max = 24;
control_ports[CONTROL_PORT_PRE_GAIN_DB].step = 0.1;
control_ports[CONTROL_PORT_PRE_GAIN_DB].value = 0;
control_ports[CONTROL_PORT_THRESHOLD_DB].name = "Threshold (db)";
control_ports[CONTROL_PORT_THRESHOLD_DB].identifier = "threshold";
control_ports[CONTROL_PORT_THRESHOLD_DB].min = -60;
control_ports[CONTROL_PORT_THRESHOLD_DB].max = 0;
control_ports[CONTROL_PORT_THRESHOLD_DB].step = 0.1;
control_ports[CONTROL_PORT_THRESHOLD_DB].value = -6;
control_ports[CONTROL_PORT_RATIO].name = "Ratio";
control_ports[CONTROL_PORT_RATIO].identifier = "ratio";
control_ports[CONTROL_PORT_RATIO].max = 48;
control_ports[CONTROL_PORT_RATIO].step = 0.1;
control_ports[CONTROL_PORT_RATIO].value = 4;
control_ports[CONTROL_PORT_ATTACK_MS].name = "Attack (ms)";
control_ports[CONTROL_PORT_ATTACK_MS].identifier = "attack";
control_ports[CONTROL_PORT_ATTACK_MS].min = 0.01;
control_ports[CONTROL_PORT_ATTACK_MS].max = 20;
control_ports[CONTROL_PORT_ATTACK_MS].step = 0.01;
control_ports[CONTROL_PORT_ATTACK_MS].value = 0.2;
control_ports[CONTROL_PORT_RELEASE_MS].name = "Release (ms)";
control_ports[CONTROL_PORT_RELEASE_MS].identifier = "release";
control_ports[CONTROL_PORT_RELEASE_MS].min = 20;
control_ports[CONTROL_PORT_RELEASE_MS].max = 2000;
control_ports[CONTROL_PORT_RELEASE_MS].step = 0.1;
control_ports[CONTROL_PORT_RELEASE_MS].value = 250;
control_ports[CONTROL_PORT_POST_GAIN_DB].name = "Post Gain (db)";
control_ports[CONTROL_PORT_POST_GAIN_DB].identifier = "post_gain";
control_ports[CONTROL_PORT_POST_GAIN_DB].min = -60;
control_ports[CONTROL_PORT_POST_GAIN_DB].max = 24;
control_ports[CONTROL_PORT_POST_GAIN_DB].step = 0.1;
control_ports[CONTROL_PORT_POST_GAIN_DB].value = 0;
control_ports[CONTROL_PORT_MIX].name = "Mix";
control_ports[CONTROL_PORT_MIX].identifier = "mix";
control_ports[CONTROL_PORT_MIX].max = 1;
control_ports[CONTROL_PORT_MIX].step = 0.01;
control_ports[CONTROL_PORT_MIX].value = 1;
block_size = 128;
sampling_rate = 0;
set_sampling_rate(44100);
set_process_block_size(128);
_update_buffers();
}
AudioEffectCompressor::~AudioEffectCompressor() {
}
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