125 lines
3.6 KiB
C++
125 lines
3.6 KiB
C++
#include "audio_effect_limiter.h"
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void AudioEffectLimiterInstance::process(const AudioFrame *p_src_frames,AudioFrame *p_dst_frames,int p_frame_count) {
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float thresh = Math::db2linear(base->treshold);
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float threshdb = base->treshold;
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float ceiling = Math::db2linear(base->ceiling);
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float ceildb = base->ceiling;
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float makeup = Math::db2linear(ceildb - threshdb);
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float makeupdb = ceildb - threshdb;
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float sc = -base->soft_clip;
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float scv = Math::db2linear(sc);
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float sccomp = Math::db2linear(-sc);
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float peakdb = ceildb + 25;
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float peaklvl = Math::db2linear(peakdb);
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float scratio = base->soft_clip_ratio;
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float scmult = Math::abs((ceildb - sc) / (peakdb - sc));
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for(int i=0;i<p_frame_count;i++) {
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float spl0 = p_src_frames[i].l;
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float spl1 = p_src_frames[i].r;
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spl0 = spl0 * makeup;
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spl1 = spl1 * makeup;
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float sign0 = (spl0 < 0.0 ? -1.0 : 1.0 );
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float sign1 = (spl1 < 0.0 ? -1.0 : 1.0 );
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float abs0 = Math::abs(spl0);
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float abs1 = Math::abs(spl1);
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float overdb0 = Math::linear2db(abs0) - ceildb;
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float overdb1 = Math::linear2db(abs1) - ceildb;
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if (abs0 > scv)
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{
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spl0 = sign0 * (scv + Math::db2linear(overdb0 * scmult));
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}
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if (abs1 > scv)
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{
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spl1 = sign1 * (scv + Math::db2linear(overdb1 * scmult));
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}
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spl0 = MIN(ceiling, Math::abs(spl0)) * (spl0 < 0.0 ? -1.0 : 1.0);
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spl1 = MIN(ceiling, Math::abs(spl1)) * (spl1 < 0.0 ? -1.0 : 1.0);
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p_dst_frames[i].l = spl0;
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p_dst_frames[i].r = spl1;
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}
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}
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Ref<AudioEffectInstance> AudioEffectLimiter::instance() {
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Ref<AudioEffectLimiterInstance> ins;
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ins.instance();
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ins->base=Ref<AudioEffectLimiter>(this);
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return ins;
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}
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void AudioEffectLimiter::set_treshold_db(float p_treshold) {
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treshold=p_treshold;
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}
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float AudioEffectLimiter::get_treshold_db() const{
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return treshold;
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}
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void AudioEffectLimiter::set_ceiling_db(float p_ceiling){
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ceiling=p_ceiling;
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}
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float AudioEffectLimiter::get_ceiling_db() const{
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return ceiling;
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}
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void AudioEffectLimiter::set_soft_clip_db(float p_soft_clip){
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soft_clip=p_soft_clip;
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}
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float AudioEffectLimiter::get_soft_clip_db() const{
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return soft_clip;
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}
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void AudioEffectLimiter::set_soft_clip_ratio(float p_soft_clip){
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soft_clip_ratio=p_soft_clip;
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}
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float AudioEffectLimiter::get_soft_clip_ratio() const{
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return soft_clip;
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}
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void AudioEffectLimiter::_bind_methods() {
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ClassDB::bind_method(D_METHOD("set_ceiling_db","ceiling"),&AudioEffectLimiter::set_ceiling_db);
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ClassDB::bind_method(D_METHOD("get_ceiling_db"),&AudioEffectLimiter::get_ceiling_db);
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ClassDB::bind_method(D_METHOD("set_treshold_db","treshold"),&AudioEffectLimiter::set_treshold_db);
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ClassDB::bind_method(D_METHOD("get_treshold_db"),&AudioEffectLimiter::get_treshold_db);
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ClassDB::bind_method(D_METHOD("set_soft_clip_db","soft_clip"),&AudioEffectLimiter::set_soft_clip_db);
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ClassDB::bind_method(D_METHOD("get_soft_clip_db"),&AudioEffectLimiter::get_soft_clip_db);
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ClassDB::bind_method(D_METHOD("set_soft_clip_ratio","soft_clip"),&AudioEffectLimiter::set_soft_clip_ratio);
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ClassDB::bind_method(D_METHOD("get_soft_clip_ratio"),&AudioEffectLimiter::get_soft_clip_ratio);
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ADD_PROPERTY(PropertyInfo(Variant::REAL,"ceiling_db",PROPERTY_HINT_RANGE,"-20,-0.1,0.1"),"set_ceiling_db","get_ceiling_db");
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ADD_PROPERTY(PropertyInfo(Variant::REAL,"treshold_db",PROPERTY_HINT_RANGE,"-30,0,0.1"),"set_treshold_db","get_treshold_db");
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ADD_PROPERTY(PropertyInfo(Variant::REAL,"soft_clip_db",PROPERTY_HINT_RANGE,"0,6,0.1"),"set_soft_clip_db","get_soft_clip_db");
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ADD_PROPERTY(PropertyInfo(Variant::REAL,"soft_clip_ratio",PROPERTY_HINT_RANGE,"3,20,0.1"),"set_soft_clip_ratio","get_soft_clip_ratio");
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}
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AudioEffectLimiter::AudioEffectLimiter()
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{
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treshold=0;
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ceiling=-0.1;
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soft_clip=2;
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soft_clip_ratio=10;
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}
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