122 lines
3.6 KiB
Rust
122 lines
3.6 KiB
Rust
// Copyright (c) 2021 Weird Constructor <weirdconstructor@gmail.com>
|
|
// This file is a part of HexoDSP. Released under GPL-3.0-or-later.
|
|
// See README.md and COPYING for details.
|
|
|
|
use crate::dsp::helpers;
|
|
use crate::dsp::{DspNode, LedPhaseVals, NodeContext, NodeId, ProcBuf, SAtom};
|
|
use crate::nodes::{NodeAudioContext, NodeExecContext};
|
|
|
|
#[macro_export]
|
|
macro_rules! fa_comb_mode {
|
|
($formatter: expr, $v: expr, $denorm_v: expr) => {{
|
|
let s = match ($v.round() as usize) {
|
|
0 => "FedBack",
|
|
1 => "FedForw",
|
|
_ => "?",
|
|
};
|
|
write!($formatter, "{}", s)
|
|
}};
|
|
}
|
|
|
|
/// A simple amplifier
|
|
#[derive(Debug, Clone)]
|
|
pub struct Comb {
|
|
comb: Box<helpers::Comb>,
|
|
}
|
|
|
|
impl Comb {
|
|
pub fn new(_nid: &NodeId) -> Self {
|
|
Self { comb: Box::new(helpers::Comb::new()) }
|
|
}
|
|
|
|
pub const inp: &'static str = "Comb inp\nThe signal input for the comb filter.\nRange: (-1..1)";
|
|
pub const g: &'static str =
|
|
"Comb g\nThe internal factor for the comb filter. Be careful with high 'g' \
|
|
values (> 0.75) in feedback mode, you will probably have to attenuate \
|
|
the output a bit yourself.\nRange: (-1..1)";
|
|
pub const time: &'static str = "Comb time\nThe comb delay time.\nRange: (0..1)";
|
|
pub const sig: &'static str = "Comb sig\nThe output of comb filter.\nRange: (-1..1)";
|
|
pub const mode: &'static str = "Comb mode\nThe mode of the comb filter, whether it's a \
|
|
feedback or feedforward comb filter.";
|
|
pub const DESC: &'static str = r#"Comb Filter
|
|
|
|
A very simple comb filter. It has interesting filtering effects
|
|
and can be used to build custom reverbs.
|
|
"#;
|
|
pub const HELP: &'static str = r#"Comb - A Simple Comb Filter
|
|
|
|
This is a comb filter that can be used for filtering
|
|
as well as for building reverbs or anything you might
|
|
find it useful for.
|
|
|
|
Attention: Be careful with high 'g' values, you might need to
|
|
attenuate the output manually for the feedback combfilter mode,
|
|
because the feedback adds up quickly.
|
|
|
|
For typical arrangements in combination with allpass filters,
|
|
see the documentation of the 'Comb' node!
|
|
"#;
|
|
}
|
|
|
|
impl DspNode for Comb {
|
|
fn outputs() -> usize {
|
|
1
|
|
}
|
|
|
|
fn set_sample_rate(&mut self, srate: f32) {
|
|
self.comb.set_sample_rate(srate);
|
|
}
|
|
|
|
fn reset(&mut self) {
|
|
self.comb.reset();
|
|
}
|
|
|
|
#[inline]
|
|
fn process<T: NodeAudioContext>(
|
|
&mut self,
|
|
ctx: &mut T,
|
|
_ectx: &mut NodeExecContext,
|
|
_nctx: &NodeContext,
|
|
atoms: &[SAtom],
|
|
inputs: &[ProcBuf],
|
|
outputs: &mut [ProcBuf],
|
|
ctx_vals: LedPhaseVals,
|
|
) {
|
|
use crate::dsp::{at, denorm, inp, out};
|
|
|
|
let inp = inp::Comb::inp(inputs);
|
|
let time = inp::Comb::time(inputs);
|
|
let g = inp::Comb::g(inputs);
|
|
let out = out::Comb::sig(outputs);
|
|
let mode = at::Comb::mode(atoms);
|
|
|
|
let c = &mut *self.comb;
|
|
|
|
if mode.i() == 0 {
|
|
for frame in 0..ctx.nframes() {
|
|
let v = inp.read(frame);
|
|
|
|
out.write(
|
|
frame,
|
|
c.next_feedback(denorm::Comb::time(time, frame), denorm::Comb::g(g, frame), v),
|
|
);
|
|
}
|
|
} else {
|
|
for frame in 0..ctx.nframes() {
|
|
let v = inp.read(frame);
|
|
|
|
out.write(
|
|
frame,
|
|
c.next_feedforward(
|
|
denorm::Comb::time(time, frame),
|
|
denorm::Comb::g(g, frame),
|
|
v,
|
|
),
|
|
);
|
|
}
|
|
}
|
|
|
|
let last_frame = ctx.nframes() - 1;
|
|
ctx_vals[0].set(out.read(last_frame));
|
|
}
|
|
}
|