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godot/servers/audio/effects/audio_effect_delay.cpp

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#include "audio_effect_delay.h"
#include "servers/audio_server.h"
#include "math_funcs.h"
void AudioEffectDelayInstance::process(const AudioFrame *p_src_frames,AudioFrame *p_dst_frames,int p_frame_count) {
int todo = p_frame_count;
while(todo) {
int to_mix = MIN(todo,256); //can't mix too much
_process_chunk(p_src_frames,p_dst_frames,to_mix);
p_src_frames+=to_mix;
p_dst_frames+=to_mix;
todo-=to_mix;
}
}
void AudioEffectDelayInstance::_process_chunk(const AudioFrame *p_src_frames,AudioFrame *p_dst_frames,int p_frame_count) {
float main_level_f=base->dry;
float mix_rate = AudioServer::get_singleton()->get_mix_rate();
float tap_1_level_f=base->tap_1_active?Math::db2linear(base->tap_1_level):0.0;
int tap_1_delay_frames=int((base->tap_1_delay_ms/1000.0)*mix_rate);;
float tap_2_level_f=base->tap_2_active?Math::db2linear(base->tap_2_level):0.0;
int tap_2_delay_frames=int((base->tap_2_delay_ms/1000.0)*mix_rate);;
float feedback_level_f=base->feedback_active?Math::db2linear(base->feedback_level):0.0;
unsigned int feedback_delay_frames=int((base->feedback_delay_ms/1000.0)*mix_rate);;
AudioFrame tap1_vol=AudioFrame(tap_1_level_f,tap_1_level_f);
tap1_vol.l*=CLAMP( 1.0 - base->tap_1_pan, 0, 1);
tap1_vol.r*=CLAMP( 1.0 + base->tap_1_pan, 0, 1);
AudioFrame tap2_vol=AudioFrame(tap_2_level_f,tap_2_level_f);
tap2_vol.l*=CLAMP( 1.0 - base->tap_2_pan, 0, 1);
tap2_vol.r*=CLAMP( 1.0 + base->tap_2_pan, 0, 1);
// feedback lowpass here
float lpf_c=expf(-2.0*Math_PI*base->feedback_lowpass/mix_rate); // 0 .. 10khz
float lpf_ic=1.0-lpf_c;
const AudioFrame *src=p_src_frames;
AudioFrame *dst=p_dst_frames;
AudioFrame *rb_buf=ring_buffer.ptr();
AudioFrame *fb_buf=feedback_buffer.ptr();
for (int i=0;i<p_frame_count;i++) {
rb_buf[ring_buffer_pos&ring_buffer_mask]=src[i];
AudioFrame main_val=src[i]*main_level_f;
AudioFrame tap_1_val=rb_buf[(ring_buffer_pos-tap_1_delay_frames)&ring_buffer_mask]*tap1_vol;
AudioFrame tap_2_val=rb_buf[(ring_buffer_pos-tap_2_delay_frames)&ring_buffer_mask]*tap2_vol;
AudioFrame out=main_val+tap_1_val+tap_2_val;
out+=fb_buf[ feedback_buffer_pos ];
//apply lowpass and feedback gain
AudioFrame fb_in=out*feedback_level_f*lpf_ic+h*lpf_c;
fb_in.undenormalise(); //avoid denormals
h=fb_in;
fb_buf[ feedback_buffer_pos ]=fb_in;
dst[i]=out;
ring_buffer_pos++;
if ( (++feedback_buffer_pos) >= feedback_delay_frames )
feedback_buffer_pos=0;
}
}
Ref<AudioEffectInstance> AudioEffectDelay::instance() {
Ref<AudioEffectDelayInstance> ins;
ins.instance();
ins->base=Ref<AudioEffectDelay>(this);
float ring_buffer_max_size=MAX_DELAY_MS+100; //add 100ms of extra room, just in case
ring_buffer_max_size/=1000.0;//convert to seconds
ring_buffer_max_size*=AudioServer::get_singleton()->get_mix_rate();
int ringbuff_size=ring_buffer_max_size;
int bits=0;
while(ringbuff_size>0) {
bits++;
ringbuff_size/=2;
}
ringbuff_size=1<<bits;
ins->ring_buffer_mask=ringbuff_size-1;
ins->ring_buffer_pos=0;
ins->ring_buffer.resize( ringbuff_size );
ins->feedback_buffer.resize( ringbuff_size );
ins->feedback_buffer_pos=0;
ins->h=AudioFrame(0,0);
return ins;
}
void AudioEffectDelay::set_dry(float p_dry) {
dry=p_dry;
}
float AudioEffectDelay::get_dry(){
return dry;
}
void AudioEffectDelay::set_tap1_active(bool p_active){
tap_1_active=p_active;
}
bool AudioEffectDelay::is_tap1_active() const{
return tap_1_active;
}
void AudioEffectDelay::set_tap1_delay_ms(float p_delay_ms){
tap_1_delay_ms=p_delay_ms;
}
float AudioEffectDelay::get_tap1_delay_ms() const{
return tap_1_delay_ms;
}
void AudioEffectDelay::set_tap1_level_db(float p_level_db){
tap_1_level=p_level_db;
}
float AudioEffectDelay::get_tap1_level_db() const{
return tap_1_level;
}
void AudioEffectDelay::set_tap1_pan(float p_pan){
tap_1_pan=p_pan;
}
float AudioEffectDelay::get_tap1_pan() const{
return tap_1_pan;
}
void AudioEffectDelay::set_tap2_active(bool p_active){
tap_2_active=p_active;
}
bool AudioEffectDelay::is_tap2_active() const{
return tap_2_active;
}
void AudioEffectDelay::set_tap2_delay_ms(float p_delay_ms){
tap_2_delay_ms=p_delay_ms;
}
float AudioEffectDelay::get_tap2_delay_ms() const{
return tap_2_delay_ms;
}
void AudioEffectDelay::set_tap2_level_db(float p_level_db){
tap_2_level=p_level_db;
}
float AudioEffectDelay::get_tap2_level_db() const{
return tap_2_level;
}
void AudioEffectDelay::set_tap2_pan(float p_pan){
tap_2_pan=p_pan;
}
float AudioEffectDelay::get_tap2_pan() const{
return tap_2_pan;
}
void AudioEffectDelay::set_feedback_active(bool p_active){
feedback_active=p_active;
}
bool AudioEffectDelay::is_feedback_active() const{
return feedback_active;
}
void AudioEffectDelay::set_feedback_delay_ms(float p_delay_ms){
feedback_delay_ms=p_delay_ms;
}
float AudioEffectDelay::get_feedback_delay_ms() const{
return feedback_delay_ms;
}
void AudioEffectDelay::set_feedback_level_db(float p_level_db){
feedback_level=p_level_db;
}
float AudioEffectDelay::get_feedback_level_db() const{
return feedback_level;
}
void AudioEffectDelay::set_feedback_lowpass(float p_lowpass){
feedback_lowpass=p_lowpass;
}
float AudioEffectDelay::get_feedback_lowpass() const{
return feedback_lowpass;
}
void AudioEffectDelay::_bind_methods() {
ClassDB::bind_method(_MD("set_dry","amount"),&AudioEffectDelay::set_dry);
ClassDB::bind_method(_MD("get_dry"),&AudioEffectDelay::get_dry);
ClassDB::bind_method(_MD("set_tap1_active","amount"),&AudioEffectDelay::set_tap1_active);
ClassDB::bind_method(_MD("is_tap1_active"),&AudioEffectDelay::is_tap1_active);
ClassDB::bind_method(_MD("set_tap1_delay_ms","amount"),&AudioEffectDelay::set_tap1_delay_ms);
ClassDB::bind_method(_MD("get_tap1_delay_ms"),&AudioEffectDelay::get_tap1_delay_ms);
ClassDB::bind_method(_MD("set_tap1_level_db","amount"),&AudioEffectDelay::set_tap1_level_db);
ClassDB::bind_method(_MD("get_tap1_level_db"),&AudioEffectDelay::get_tap1_level_db);
ClassDB::bind_method(_MD("set_tap1_pan","amount"),&AudioEffectDelay::set_tap1_pan);
ClassDB::bind_method(_MD("get_tap1_pan"),&AudioEffectDelay::get_tap1_pan);
ClassDB::bind_method(_MD("set_tap2_active","amount"),&AudioEffectDelay::set_tap2_active);
ClassDB::bind_method(_MD("is_tap2_active"),&AudioEffectDelay::is_tap2_active);
ClassDB::bind_method(_MD("set_tap2_delay_ms","amount"),&AudioEffectDelay::set_tap2_delay_ms);
ClassDB::bind_method(_MD("get_tap2_delay_ms"),&AudioEffectDelay::get_tap2_delay_ms);
ClassDB::bind_method(_MD("set_tap2_level_db","amount"),&AudioEffectDelay::set_tap2_level_db);
ClassDB::bind_method(_MD("get_tap2_level_db"),&AudioEffectDelay::get_tap2_level_db);
ClassDB::bind_method(_MD("set_tap2_pan","amount"),&AudioEffectDelay::set_tap2_pan);
ClassDB::bind_method(_MD("get_tap2_pan"),&AudioEffectDelay::get_tap2_pan);
ClassDB::bind_method(_MD("set_feedback_active","amount"),&AudioEffectDelay::set_feedback_active);
ClassDB::bind_method(_MD("is_feedback_active"),&AudioEffectDelay::is_feedback_active);
ClassDB::bind_method(_MD("set_feedback_delay_ms","amount"),&AudioEffectDelay::set_feedback_delay_ms);
ClassDB::bind_method(_MD("get_feedback_delay_ms"),&AudioEffectDelay::get_feedback_delay_ms);
ClassDB::bind_method(_MD("set_feedback_level_db","amount"),&AudioEffectDelay::set_feedback_level_db);
ClassDB::bind_method(_MD("get_feedback_level_db"),&AudioEffectDelay::get_feedback_level_db);
ClassDB::bind_method(_MD("set_feedback_lowpass","amount"),&AudioEffectDelay::set_feedback_lowpass);
ClassDB::bind_method(_MD("get_feedback_lowpass"),&AudioEffectDelay::get_feedback_lowpass);
ADD_PROPERTY(PropertyInfo(Variant::REAL,"dry",PROPERTY_HINT_RANGE,"0,1,0.01"),_SCS("set_dry"),_SCS("get_dry"));
ADD_PROPERTY(PropertyInfo(Variant::BOOL,"tap1/active"),_SCS("set_tap1_active"),_SCS("is_tap1_active"));
ADD_PROPERTY(PropertyInfo(Variant::REAL,"tap1/delay_ms",PROPERTY_HINT_RANGE,"0,1500,1"),_SCS("set_tap1_delay_ms"),_SCS("get_tap1_delay_ms"));
ADD_PROPERTY(PropertyInfo(Variant::REAL,"tap1/level_db",PROPERTY_HINT_RANGE,"-60,0,0.01"),_SCS("set_tap1_level_db"),_SCS("get_tap1_level_db"));
ADD_PROPERTY(PropertyInfo(Variant::REAL,"tap1/pan",PROPERTY_HINT_RANGE,"-1,1,0.01"),_SCS("set_tap1_pan"),_SCS("get_tap1_pan"));
ADD_PROPERTY(PropertyInfo(Variant::BOOL,"tap2/active"),_SCS("set_tap2_active"),_SCS("is_tap2_active"));
ADD_PROPERTY(PropertyInfo(Variant::REAL,"tap2/delay_ms",PROPERTY_HINT_RANGE,"0,1500,1"),_SCS("set_tap2_delay_ms"),_SCS("get_tap2_delay_ms"));
ADD_PROPERTY(PropertyInfo(Variant::REAL,"tap2/level_db",PROPERTY_HINT_RANGE,"-60,0,0.01"),_SCS("set_tap2_level_db"),_SCS("get_tap2_level_db"));
ADD_PROPERTY(PropertyInfo(Variant::REAL,"tap2/pan",PROPERTY_HINT_RANGE,"-1,1,0.01"),_SCS("set_tap2_pan"),_SCS("get_tap2_pan"));
ADD_PROPERTY(PropertyInfo(Variant::BOOL,"feedback/active"),_SCS("set_feedback_active"),_SCS("is_feedback_active"));
ADD_PROPERTY(PropertyInfo(Variant::REAL,"feedback/delay_ms",PROPERTY_HINT_RANGE,"0,1500,1"),_SCS("set_feedback_delay_ms"),_SCS("get_feedback_delay_ms"));
ADD_PROPERTY(PropertyInfo(Variant::REAL,"feedback/level_db",PROPERTY_HINT_RANGE,"-60,0,0.01"),_SCS("set_feedback_level_db"),_SCS("get_feedback_level_db"));
ADD_PROPERTY(PropertyInfo(Variant::REAL,"feedback/lowpass",PROPERTY_HINT_RANGE,"1,16000,1"),_SCS("set_feedback_lowpass"),_SCS("get_feedback_lowpass"));
}
AudioEffectDelay::AudioEffectDelay()
{
tap_1_active=true;
tap_1_delay_ms=250;
tap_1_level=-6;
tap_1_pan=0.2;
tap_2_active=true;
tap_2_delay_ms=500;
tap_2_level=-12;
tap_2_pan=-0.4;
feedback_active=false;
feedback_delay_ms=340;
feedback_level=-6;
feedback_lowpass=16000;
dry=1.0;
}
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