/*************************************************************************/ /* audio_effect_limiter.cpp */ /*************************************************************************/ /* This file is part of: */ /* GODOT ENGINE */ /* https://godotengine.org */ /*************************************************************************/ /* Copyright (c) 2007-2022 Juan Linietsky, Ariel Manzur. */ /* Copyright (c) 2014-2022 Godot Engine contributors (cf. AUTHORS.md). */ /* */ /* Permission is hereby granted, free of charge, to any person obtaining */ /* a copy of this software and associated documentation files (the */ /* "Software"), to deal in the Software without restriction, including */ /* without limitation the rights to use, copy, modify, merge, publish, */ /* distribute, sublicense, and/or sell copies of the Software, and to */ /* permit persons to whom the Software is furnished to do so, subject to */ /* the following conditions: */ /* */ /* The above copyright notice and this permission notice shall be */ /* included in all copies or substantial portions of the Software. */ /* */ /* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */ /* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */ /* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/ /* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */ /* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */ /* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */ /* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */ /*************************************************************************/ #include "audio_effect_limiter.h" void AudioEffectLimiterInstance::process(const AudioFrame *p_src_frames, AudioFrame *p_dst_frames, int p_frame_count) { float threshdb = base->threshold; float ceiling = Math::db2linear(base->ceiling); float ceildb = base->ceiling; float makeup = Math::db2linear(ceildb - threshdb); float sc = -base->soft_clip; float scv = Math::db2linear(sc); float peakdb = ceildb + 25; float scmult = Math::abs((ceildb - sc) / (peakdb - sc)); for (int i = 0; i < p_frame_count; i++) { float spl0 = p_src_frames[i].l; float spl1 = p_src_frames[i].r; spl0 = spl0 * makeup; spl1 = spl1 * makeup; float sign0 = (spl0 < 0.0 ? -1.0 : 1.0); float sign1 = (spl1 < 0.0 ? -1.0 : 1.0); float abs0 = Math::abs(spl0); float abs1 = Math::abs(spl1); float overdb0 = Math::linear2db(abs0) - ceildb; float overdb1 = Math::linear2db(abs1) - ceildb; if (abs0 > scv) { spl0 = sign0 * (scv + Math::db2linear(overdb0 * scmult)); } if (abs1 > scv) { spl1 = sign1 * (scv + Math::db2linear(overdb1 * scmult)); } spl0 = MIN(ceiling, Math::abs(spl0)) * (spl0 < 0.0 ? -1.0 : 1.0); spl1 = MIN(ceiling, Math::abs(spl1)) * (spl1 < 0.0 ? -1.0 : 1.0); p_dst_frames[i].l = spl0; p_dst_frames[i].r = spl1; } } Ref AudioEffectLimiter::instantiate() { Ref ins; ins.instantiate(); ins->base = Ref(this); return ins; } void AudioEffectLimiter::set_threshold_db(float p_threshold) { threshold = p_threshold; } float AudioEffectLimiter::get_threshold_db() const { return threshold; } void AudioEffectLimiter::set_ceiling_db(float p_ceiling) { ceiling = p_ceiling; } float AudioEffectLimiter::get_ceiling_db() const { return ceiling; } void AudioEffectLimiter::set_soft_clip_db(float p_soft_clip) { soft_clip = p_soft_clip; } float AudioEffectLimiter::get_soft_clip_db() const { return soft_clip; } void AudioEffectLimiter::set_soft_clip_ratio(float p_soft_clip) { soft_clip_ratio = p_soft_clip; } float AudioEffectLimiter::get_soft_clip_ratio() const { return soft_clip_ratio; } void AudioEffectLimiter::_bind_methods() { ClassDB::bind_method(D_METHOD("set_ceiling_db", "ceiling"), &AudioEffectLimiter::set_ceiling_db); ClassDB::bind_method(D_METHOD("get_ceiling_db"), &AudioEffectLimiter::get_ceiling_db); ClassDB::bind_method(D_METHOD("set_threshold_db", "threshold"), &AudioEffectLimiter::set_threshold_db); ClassDB::bind_method(D_METHOD("get_threshold_db"), &AudioEffectLimiter::get_threshold_db); ClassDB::bind_method(D_METHOD("set_soft_clip_db", "soft_clip"), &AudioEffectLimiter::set_soft_clip_db); ClassDB::bind_method(D_METHOD("get_soft_clip_db"), &AudioEffectLimiter::get_soft_clip_db); ClassDB::bind_method(D_METHOD("set_soft_clip_ratio", "soft_clip"), &AudioEffectLimiter::set_soft_clip_ratio); ClassDB::bind_method(D_METHOD("get_soft_clip_ratio"), &AudioEffectLimiter::get_soft_clip_ratio); ADD_PROPERTY(PropertyInfo(Variant::FLOAT, "ceiling_db", PROPERTY_HINT_RANGE, "-20,-0.1,0.1,suffix:dB"), "set_ceiling_db", "get_ceiling_db"); ADD_PROPERTY(PropertyInfo(Variant::FLOAT, "threshold_db", PROPERTY_HINT_RANGE, "-30,0,0.1,suffix:dB"), "set_threshold_db", "get_threshold_db"); ADD_PROPERTY(PropertyInfo(Variant::FLOAT, "soft_clip_db", PROPERTY_HINT_RANGE, "0,6,0.1,suffix:dB"), "set_soft_clip_db", "get_soft_clip_db"); ADD_PROPERTY(PropertyInfo(Variant::FLOAT, "soft_clip_ratio", PROPERTY_HINT_RANGE, "3,20,0.1"), "set_soft_clip_ratio", "get_soft_clip_ratio"); } AudioEffectLimiter::AudioEffectLimiter() { threshold = 0; ceiling = -0.1; soft_clip = 2; soft_clip_ratio = 10; }