112 lines
3 KiB
Rust
112 lines
3 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 crate::nodes::{NodeAudioContext, NodeExecContext};
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use crate::dsp::{NodeId, SAtom, ProcBuf, DspNode, LedPhaseVals, NodeContext};
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use crate::dsp::helpers::AllPass;
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/// A simple amplifier
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#[derive(Debug, Clone)]
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pub struct AllP {
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allpass: Box<AllPass>,
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}
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impl AllP {
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pub fn new(_nid: &NodeId) -> Self {
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Self {
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allpass: Box::new(AllPass::new()),
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}
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}
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pub const inp : &'static str =
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"AllP inp\nThe signal input for the allpass filter.\nRange: (-1..1)";
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pub const g : &'static str =
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"AllP g\nThe internal factor for the allpass filter.\nRange: (-1..1)";
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pub const time : &'static str =
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"AllP time\nThe allpass delay time.\nRange: (0..1)";
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pub const sig : &'static str =
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"AllP sig\nThe output of allpass filter.\nRange: (-1..1)";
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pub const DESC : &'static str =
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r#"Single Allpass Filter
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This is an allpass filter that can be used to build reverbs
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or anything you might find it useful for.
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"#;
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pub const HELP : &'static str =
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r#"AllP - A Simple Single Allpass Filter
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This is an allpass filter that can be used to build reverbs
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or anything you might find it useful for.
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Typical arrangements are (Schroeder Reverb):
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t=4.5ms
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g=0.7 -> Comb
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AllP -> AllP -> AllP -> -> Comb
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t=42ms t=13.5ms -> Comb
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g=0.7 g=0.7 -> Comb
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Or:
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Comb -> t=0.48ms
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Comb -> g=0.7
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Comb -> AllP -> AllP -> AllP
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Comb -> t=5ms t=1.68ms
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g=0.7 g=0.7
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Typical values for the comb filters are in the range g=0.6 to 0.9
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and time in the range of 30ms to 250ms.
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Feel free to deviate from this and experiment around.
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Building your own reverbs is fun!
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(And don't forget that you can create feedback
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using the FbWr and FbRd nodes!)
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"#;
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}
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impl DspNode for AllP {
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fn outputs() -> usize { 1 }
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fn set_sample_rate(&mut self, srate: f32) {
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self.allpass.set_sample_rate(srate);
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}
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fn reset(&mut self) {
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self.allpass.reset();
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}
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#[inline]
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fn process<T: NodeAudioContext>(
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&mut self, ctx: &mut T, _ectx: &mut NodeExecContext,
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_nctx: &NodeContext,
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_atoms: &[SAtom], inputs: &[ProcBuf],
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outputs: &mut [ProcBuf], ctx_vals: LedPhaseVals)
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{
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use crate::dsp::{out, inp, denorm};
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let inp = inp::AllP::inp(inputs);
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let time = inp::AllP::time(inputs);
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let g = inp::AllP::g(inputs);
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let out = out::AllP::sig(outputs);
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let ap = &mut *self.allpass;
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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(frame,
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ap.next(
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denorm::AllP::time(time, frame),
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denorm::AllP::g(g, frame),
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v));
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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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