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