403 lines
15 KiB
Rust
403 lines
15 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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process_1pole_highpass, process_1pole_lowpass, process_1pole_tpt_highpass,
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process_1pole_tpt_lowpass, process_hal_chamberlin_svf, process_simper_svf,
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process_stilson_moog,
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};
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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_sfilter_type {
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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 => "LP 1p",
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1 => "LP 1pt",
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2 => "HP 1p",
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3 => "HP 1pt",
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4 => "LP 12c",
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5 => "HP 12c",
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6 => "BP 12c",
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7 => "NO 12c",
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8 => "LP 12s",
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9 => "HP 12s",
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10 => "BP 12s",
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11 => "NO 12s",
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12 => "PK 12s",
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13 => "LP 24m",
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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 SFilter {
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israte: f32,
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z: f32,
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y: f32,
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k: f32,
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h: f32,
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delay: [f32; 4],
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otype: i8,
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}
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impl SFilter {
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pub fn new(_nid: &NodeId) -> Self {
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Self { israte: 1.0 / 44100.0, z: 0.0, y: 0.0, k: 0.0, h: 0.0, delay: [0.0; 4], otype: -1 }
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}
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pub const inp: &'static str = "SFilter inp\nSignal input\nRange: (-1..1)\n";
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pub const freq: &'static str = "SFilter freq\nFilter cutoff frequency.\nRange: (-1..1)\n";
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pub const res: &'static str = "SFilter res\nFilter resonance.\nRange: (0..1)\n";
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pub const ftype: &'static str = "SFilter ftype\nThe filter type, there are varying types of \
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filters available. Please consult the node documentation for \
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a complete list.\n\
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Types: 1p/1pt=one poles, 12c=Hal Chamberlin SVF,\n\
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12s=Simper SVF, 24m=Moog\n\
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Outputs: LP=Low-,HP=High-,BP=Band-Pass,NO=Notch,PK=Peak";
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pub const sig: &'static str = "SFilter sig\nFiltered signal output.\nRange: (-1..1)\n";
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pub const DESC: &'static str = r#"Simple Filter
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This is a collection of more or less simple filters.
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There are only two parameters: Filter cutoff 'freq' and the 'res'onance.
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"#;
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pub const HELP: &'static str = r#"SFilter - Simple Audio Filter Collection
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This is a collection of a few more or less simple filters
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of varying types. There are only few parameters for you to change: 'freq'
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and 'res'onance. You can switch between the types with the 'ftype'.
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There are currently following filters available:
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HP 1p - One pole low-pass filter (6db)
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HP 1pt - One pole low-pass filter (6db) (TPT form)
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LP 1p - One pole high-pass filter (6db)
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LP 1pt - One pole high-pass filter (6db) (TPT form)
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The Hal Chamberlin filters are an older state variable filter design,
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that is limited to max cutoff frequency of 16kHz. For a more stable
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filter use the "12s" variants.
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LP 12c - Low-pass Hal Chamberlin state variable filter (12dB)
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HP 12c - High-pass Hal Chamberlin state variable filter (12dB)
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BP 12c - Band-pass Hal Chamberlin state variable filter (12dB)
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NO 12c - Notch Hal Chamberlin state variable filter (12dB)
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The (Andrew) Simper state variable filter is a newer design
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and stable up to 22kHz at 44.1kHz sampling rate. It's overall more precise
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and less quirky than the Hal Chamberlin SVF.
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LP 12s - Low-pass Simper state variable filter (12dB)
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HP 12s - High-pass Simper state variable filter (12dB)
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BP 12s - Band-pass Simper state variable filter (12dB)
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NO 12s - Notch Simper state variable filter (12dB)
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PK 12s - Peak Simper state variable filter (12dB)
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Next page: more filters (eg. Moog)
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---page---
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SFilter - Simple Audio Filter Collection
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For a more colored filter reach for the Stilson/Moog filter with a 24dB
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fall off per octave. Beware high cutoff frequencies for this filter,
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as it can become quite unstable.
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LP 24m - Low-pass Stilson/Moog filter (24dB)
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"#;
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}
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macro_rules! process_filter_fun32 {
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($nframes: expr, $inp: expr, $out: ident, $freq: ident, $res: ident,
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$input: ident, $minfreq: expr, $maxfreq: expr, $block: block) => {{
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for frame in 0..$nframes {
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let $input = $inp.read(frame);
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let $freq = denorm::SFilter::freq($freq, frame);
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let $freq = $freq.clamp($minfreq, $maxfreq);
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let $res = denorm::SFilter::res($res, frame);
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let $res = $res.clamp(0.0, 0.99);
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let s = $block;
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$out.write(frame, s);
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}
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}};
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($nframes: expr, $inp: expr, $out: ident, $freq: ident, $res: ident,
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$input: ident, $maxfreq: expr, $block: block) => {{
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for frame in 0..$nframes {
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let $input = $inp.read(frame);
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let $freq = denorm::SFilter::freq($freq, frame);
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let $freq = $freq.clamp(1.0, $maxfreq);
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let $res = denorm::SFilter::res($res, frame);
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let $res = $res.clamp(0.0, 0.99);
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let s = $block;
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$out.write(frame, s);
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}
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}};
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($nframes: expr, $inp: expr, $out: ident, $freq: ident, $res: ident,
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$maxres: expr, $input: ident, $maxfreq: expr, $block: block) => {{
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for frame in 0..$nframes {
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let $input = $inp.read(frame);
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let $freq = denorm::SFilter::freq($freq, frame);
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let $freq = $freq.clamp(1.0, $maxfreq);
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let $res = denorm::SFilter::res($res, frame);
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let $res = $res.clamp(0.0, $maxres);
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let s = $block;
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$out.write(frame, s);
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}
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}};
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($nframes: expr, $inp: expr, $out: ident, $freq: ident,
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$input: ident, $maxfreq: expr, $block: block) => {{
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for frame in 0..$nframes {
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let $input = $inp.read(frame);
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let $freq = denorm::SFilter::freq($freq, frame);
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let $freq = $freq.clamp(1.0, $maxfreq);
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let s = $block;
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$out.write(frame, s);
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}
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}};
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}
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macro_rules! process_filter_fun {
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($nframes: expr, $inp: expr, $out: ident, $freq: ident, $res: ident,
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$input: ident, $minfreq: expr, $maxfreq: expr, $block: block) => {{
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for frame in 0..$nframes {
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let $input = $inp.read(frame) as f64;
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let $freq = denorm::SFilter::freq($freq, frame) as f64;
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let $freq = $freq.clamp($minfreq, $maxfreq);
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let $res = denorm::SFilter::res($res, frame) as f64;
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let $res = $res.clamp(0.0, 0.99);
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let s = $block;
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$out.write(frame, s as f32);
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}
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}};
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($nframes: expr, $inp: expr, $out: ident, $freq: ident, $res: ident,
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$input: ident, $maxfreq: expr, $block: block) => {{
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for frame in 0..$nframes {
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let $input = $inp.read(frame) as f64;
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let $freq = denorm::SFilter::freq($freq, frame) as f64;
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let $freq = $freq.clamp(1.0, $maxfreq);
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let $res = denorm::SFilter::res($res, frame) as f64;
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let $res = $res.clamp(0.0, 0.99);
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let s = $block;
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$out.write(frame, s as f32);
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}
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}};
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($nframes: expr, $inp: expr, $out: ident, $freq: ident, $res: ident,
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$maxres: expr, $input: ident, $maxfreq: expr, $block: block) => {{
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for frame in 0..$nframes {
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let $input = $inp.read(frame) as f64;
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let $freq = denorm::SFilter::freq($freq, frame) as f64;
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let $freq = $freq.clamp(1.0, $maxfreq);
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let $res = denorm::SFilter::res($res, frame) as f64;
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let $res = $res.clamp(0.0, $maxres);
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let s = $block;
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$out.write(frame, s as f32);
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}
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}};
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($nframes: expr, $inp: expr, $out: ident, $freq: ident,
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$input: ident, $maxfreq: expr, $block: block) => {{
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for frame in 0..$nframes {
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let $input = $inp.read(frame) as f64;
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let $freq = denorm::SFilter::freq($freq, frame) as f64;
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let $freq = $freq.clamp(1.0, $maxfreq);
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let s = $block;
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$out.write(frame, s as f32);
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}
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}};
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}
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impl DspNode for SFilter {
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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.israte = 1.0 / srate;
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}
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fn reset(&mut self) {
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self.z = 0.0;
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self.y = 0.0;
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self.k = 0.0;
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self.h = 0.0;
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self.delay = [0.0; 4];
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self.otype = -1;
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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::SFilter::inp(inputs);
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let freq = inp::SFilter::freq(inputs);
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let res = inp::SFilter::res(inputs);
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let ftype = at::SFilter::ftype(atoms);
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let out = out::SFilter::sig(outputs);
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let ftype = ftype.i() as i8;
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if ftype != self.otype {
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self.y = 0.0;
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self.z = 0.0;
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self.k = 0.0;
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self.h = 0.0;
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self.delay = [0.0; 4];
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self.otype = ftype;
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}
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match ftype {
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0 => {
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// Lowpass
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process_filter_fun32!(ctx.nframes(), inp, out, freq, input, 22000.0, {
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process_1pole_lowpass(input, freq, self.israte, &mut self.z)
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})
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}
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1 => {
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// Lowpass TPT
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process_filter_fun32!(ctx.nframes(), inp, out, freq, input, 22000.0, {
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process_1pole_tpt_lowpass(input, freq, self.israte, &mut self.z)
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})
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}
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2 => {
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// Highpass
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process_filter_fun32!(ctx.nframes(), inp, out, freq, input, 22000.0, {
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process_1pole_highpass(input, freq, self.israte, &mut self.z, &mut self.y)
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})
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}
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3 => {
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// Highpass TPT
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process_filter_fun32!(ctx.nframes(), inp, out, freq, input, 22000.0, {
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process_1pole_tpt_highpass(input, freq, self.israte, &mut self.z)
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})
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}
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4 => {
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// Low Pass Hal Chamberlin SVF
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process_filter_fun32!(ctx.nframes(), inp, out, freq, res, input, 2.0, 16000.0, {
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let (_high, _notch) = process_hal_chamberlin_svf(
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input,
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freq,
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res,
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self.israte,
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&mut self.z,
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&mut self.y,
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);
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self.y
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});
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}
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5 => {
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// High Pass Hal Chamberlin SVF
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process_filter_fun32!(ctx.nframes(), inp, out, freq, res, input, 16000.0, {
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let (high, _notch) = process_hal_chamberlin_svf(
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input,
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freq,
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res,
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self.israte,
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&mut self.z,
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&mut self.y,
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);
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high
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});
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}
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6 => {
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// Band Pass Hal Chamberlin SVF
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process_filter_fun32!(ctx.nframes(), inp, out, freq, res, input, 16000.0, {
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let (_high, _notch) = process_hal_chamberlin_svf(
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input,
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freq,
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res,
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self.israte,
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&mut self.z,
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&mut self.y,
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);
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self.z
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});
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}
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7 => {
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// Notch Hal Chamberlin SVF
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process_filter_fun32!(ctx.nframes(), inp, out, freq, res, input, 16000.0, {
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let (_high, notch) = process_hal_chamberlin_svf(
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input,
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freq,
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res,
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self.israte,
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&mut self.z,
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&mut self.y,
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);
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notch
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});
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}
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8 => {
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// Simper SVF Low Pass
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process_filter_fun32!(ctx.nframes(), inp, out, freq, res, 1.0, input, 22000.0, {
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let (low, _band, _high) =
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process_simper_svf(input, freq, res, self.israte, &mut self.k, &mut self.h);
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low
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});
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}
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9 => {
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// Simper SVF High Pass
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process_filter_fun32!(ctx.nframes(), inp, out, freq, res, 1.0, input, 22000.0, {
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let (_low, _band, high) =
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process_simper_svf(input, freq, res, self.israte, &mut self.k, &mut self.h);
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high
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});
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}
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10 => {
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// Simper SVF Band Pass
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process_filter_fun32!(ctx.nframes(), inp, out, freq, res, 1.0, input, 22000.0, {
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let (_low, band, _high) =
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process_simper_svf(input, freq, res, self.israte, &mut self.k, &mut self.h);
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band
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});
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}
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11 => {
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// Simper SVF Notch
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process_filter_fun32!(ctx.nframes(), inp, out, freq, res, 1.0, input, 22000.0, {
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let (low, _band, high) =
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process_simper_svf(input, freq, res, self.israte, &mut self.k, &mut self.h);
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low + high
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});
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}
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12 => {
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// Simper SVF Peak
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process_filter_fun32!(ctx.nframes(), inp, out, freq, res, 1.0, input, 22000.0, {
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let (low, _band, high) =
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process_simper_svf(input, freq, res, self.israte, &mut self.k, &mut self.h);
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low - high
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});
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}
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13 => {
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// Stilson/Moog Low Pass
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process_filter_fun32!(ctx.nframes(), inp, out, freq, res, 1.0, input, 20000.0, {
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// Clip here, to prevent blowups, because the
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// moog filter is quite touchy...
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let input = input.clamp(-1.0, 1.0);
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process_stilson_moog(
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input,
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freq,
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res,
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self.israte,
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&mut self.z,
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&mut self.y,
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&mut self.k,
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&mut self.h,
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&mut self.delay,
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)
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});
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}
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_ => {}
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}
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ctx_vals[0].set(out.read(ctx.nframes() - 1));
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}
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}
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