172 lines
4.4 KiB
C++
172 lines
4.4 KiB
C++
#include "audio_effect_distortion.h"
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#include "servers/audio_server.h"
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#include "math_funcs.h"
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void AudioEffectDistortionInstance::process(const AudioFrame *p_src_frames,AudioFrame *p_dst_frames,int p_frame_count) {
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const float *src = (const float*)p_src_frames;
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float *dst = (float*)p_dst_frames;
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//float lpf_c=expf(-2.0*Math_PI*keep_hf_hz.get()/(mix_rate*(float)OVERSAMPLE));
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float lpf_c=expf(-2.0*Math_PI*base->keep_hf_hz/(AudioServer::get_singleton()->get_mix_rate()));
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float lpf_ic=1.0-lpf_c;
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float drive_f=base->drive;
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float pregain_f=Math::db2linear(base->pre_gain);
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float postgain_f=Math::db2linear(base->post_gain);
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float atan_mult=pow(10,drive_f*drive_f*3.0)-1.0+0.001;
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float atan_div=1.0/(atanf(atan_mult)*(1.0+drive_f*8));
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float lofi_mult=powf(2.0,2.0+(1.0-drive_f)*14); //goes from 16 to 2 bits
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for (int i=0;i<p_frame_count*2;i++) {
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float out=undenormalise(src[i]*lpf_ic+lpf_c*h[i&1]);
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h[i&1]=out;
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float a=out;
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float ha=src[i]-out; //high freqs
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a*=pregain_f;
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switch (base->mode) {
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case AudioEffectDistortion::MODE_CLIP: {
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a=powf(a,1.0001-drive_f);
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if (a>1.0)
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a=1.0;
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else if (a<(-1.0))
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a=-1.0;
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} break;
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case AudioEffectDistortion::MODE_ATAN: {
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a=atanf(a*atan_mult)*atan_div;
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} break;
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case AudioEffectDistortion::MODE_LOFI: {
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a = floorf(a*lofi_mult+0.5)/lofi_mult;
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} break;
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case AudioEffectDistortion::MODE_OVERDRIVE: {
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const double x = a * 0.686306;
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const double z = 1 + exp (sqrt (fabs (x)) * -0.75);
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a = (expf(x) - expf(-x * z)) / (expf(x) + expf(-x));
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} break;
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case AudioEffectDistortion::MODE_WAVESHAPE: {
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float x = a;
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float k= 2*drive_f/(1.00001-drive_f);
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a = (1.0+k)*x/(1.0+k*fabsf(x));
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} break;
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}
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dst[i]=a*postgain_f+ha;
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}
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}
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Ref<AudioEffectInstance> AudioEffectDistortion::instance() {
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Ref<AudioEffectDistortionInstance> ins;
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ins.instance();
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ins->base=Ref<AudioEffectDistortion>(this);
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ins->h[0]=0;
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ins->h[1]=0;
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return ins;
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}
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void AudioEffectDistortion::set_mode(Mode p_mode) {
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mode=p_mode;
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}
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AudioEffectDistortion::Mode AudioEffectDistortion::get_mode() const{
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return mode;
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}
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void AudioEffectDistortion::set_pre_gain(float p_pre_gain){
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pre_gain=p_pre_gain;
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}
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float AudioEffectDistortion::get_pre_gain() const{
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return pre_gain;
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}
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void AudioEffectDistortion::set_keep_hf_hz(float p_keep_hf_hz){
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keep_hf_hz=p_keep_hf_hz;
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}
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float AudioEffectDistortion::get_keep_hf_hz() const{
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return keep_hf_hz;
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}
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void AudioEffectDistortion::set_drive(float p_drive){
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drive=p_drive;
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}
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float AudioEffectDistortion::get_drive() const{
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return drive;
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}
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void AudioEffectDistortion::set_post_gain(float p_post_gain){
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post_gain=p_post_gain;
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}
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float AudioEffectDistortion::get_post_gain() const{
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return post_gain;
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}
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void AudioEffectDistortion::_bind_methods() {
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ClassDB::bind_method(_MD("set_mode","mode"),&AudioEffectDistortion::set_mode);
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ClassDB::bind_method(_MD("get_mode"),&AudioEffectDistortion::get_mode);
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ClassDB::bind_method(_MD("set_pre_gain","pre_gain"),&AudioEffectDistortion::set_pre_gain);
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ClassDB::bind_method(_MD("get_pre_gain"),&AudioEffectDistortion::get_pre_gain);
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ClassDB::bind_method(_MD("set_keep_hf_hz","keep_hf_hz"),&AudioEffectDistortion::set_keep_hf_hz);
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ClassDB::bind_method(_MD("get_keep_hf_hz"),&AudioEffectDistortion::get_keep_hf_hz);
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ClassDB::bind_method(_MD("set_drive","drive"),&AudioEffectDistortion::set_drive);
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ClassDB::bind_method(_MD("get_drive"),&AudioEffectDistortion::get_drive);
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ClassDB::bind_method(_MD("set_post_gain","post_gain"),&AudioEffectDistortion::set_post_gain);
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ClassDB::bind_method(_MD("get_post_gain"),&AudioEffectDistortion::get_post_gain);
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ADD_PROPERTY(PropertyInfo(Variant::INT,"mode",PROPERTY_HINT_ENUM,"Clip,ATan,LoFi,Overdrive,WaveShape"),_SCS("set_mode"),_SCS("get_mode"));
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ADD_PROPERTY(PropertyInfo(Variant::REAL,"pre_gain",PROPERTY_HINT_RANGE,"-60,60,0.01"),_SCS("set_pre_gain"),_SCS("get_pre_gain"));
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ADD_PROPERTY(PropertyInfo(Variant::REAL,"keep_hf_hz",PROPERTY_HINT_RANGE,"1,20000,1"),_SCS("set_keep_hf_hz"),_SCS("get_keep_hf_hz"));
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ADD_PROPERTY(PropertyInfo(Variant::REAL,"drive",PROPERTY_HINT_RANGE,"0,1,0.01"),_SCS("set_drive"),_SCS("get_drive"));
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ADD_PROPERTY(PropertyInfo(Variant::REAL,"post_gain",PROPERTY_HINT_RANGE,"-80,24,0.01"),_SCS("set_post_gain"),_SCS("get_post_gain"));
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}
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AudioEffectDistortion::AudioEffectDistortion()
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{
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mode=MODE_CLIP;
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pre_gain=0;
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post_gain=0;
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keep_hf_hz=16000;
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drive=0;
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}
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