134 lines
4 KiB
Rust
134 lines
4 KiB
Rust
// Copyright (c) 2021 Weird Constructor <weirdconstructor@gmail.com>
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// This is a part of HexoDSP. Released under (A)GPLv3 or any 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};
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use crate::dsp::helpers::{DelayBuffer, crossfade, DCBlockFilter};
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#[macro_export]
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macro_rules! fa_dly_s { ($formatter: expr, $v: expr, $denorm_v: expr) => { {
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let s =
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match ($v.round() as usize) {
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0 => "Zero",
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1 => "One",
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2 => "Two",
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3 => "Three",
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4 => "Four",
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5 => "Five",
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6 => "Six",
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7 => "Seven",
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8 => "Eigth",
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9 => "Nine",
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10 => "Ten",
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_ => "?",
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};
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write!($formatter, "{}", s)
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} } }
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/// A simple amplifier
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#[derive(Debug, Clone)]
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pub struct Delay {
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buffer: Box<DelayBuffer>,
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fb_sample: f32,
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dcblock: DCBlockFilter,
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}
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impl Delay {
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pub fn new(_nid: &NodeId) -> Self {
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Self {
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buffer: Box::new(DelayBuffer::new()),
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fb_sample: 0.0,
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dcblock: DCBlockFilter::new(),
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}
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}
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pub const inp : &'static str =
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"Delay inp\nThe signal input for the delay. You can mix in this \
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input to the output with the 'mix' parameter.\nRange: (-1..1)";
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pub const time : &'static str =
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"Delay time\nThe delay time. It can be freely modulated to your \
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likings.\nRange: (0..1)";
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pub const fb : &'static str =
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"Delay fb\nThe feedback amount of the delay output to it's input. \
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\nRange: (0..1)";
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pub const mix : &'static str =
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"Delay mix\nThe dry/wet mix of the delay.\nRange: (0..1)";
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pub const sig : &'static str =
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"Delay sig\nThe output of the dry/wet mix.\nRange: (-1..1)";
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pub const DESC : &'static str =
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r#"Simple Delay Line
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This is a very simple single buffer delay node.
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It provides an internal feedback and dry/wet mix.
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"#;
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pub const HELP : &'static str =
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r#"Delay - A Simple Delay Line
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This node provides a very simple delay line with the bare minimum of
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parameters. Most importantly a freely modulateable 'time' parameter
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and a feedback 'fb' parameter.
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Via the 'mix' parameter you can mix in the input signal to the output.
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You can use this node to delay any kind of signal, from a simple control
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signal to an audio signal.
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For other kinds of delay/feedback please see also the 'FbWr'/'FbRd' nodes.
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"#;
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}
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impl DspNode for Delay {
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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.buffer.set_sample_rate(srate);
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self.dcblock.set_sample_rate(srate);
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}
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fn reset(&mut self) {
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self.buffer.reset();
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self.dcblock.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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_atoms: &[SAtom], _params: &[ProcBuf], inputs: &[ProcBuf],
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outputs: &mut [ProcBuf], _led: LedPhaseVals)
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{
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use crate::dsp::{out, inp, denorm};
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let buffer = &mut *self.buffer;
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let dcblock = &mut self.dcblock;
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let inp = inp::Delay::inp(inputs);
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let time = inp::Delay::time(inputs);
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let fb = inp::Delay::fb(inputs);
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let mix = inp::Delay::mix(inputs);
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let out = out::Delay::sig(outputs);
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let mut fb_s = self.fb_sample;
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for frame in 0..ctx.nframes() {
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let dry = inp.read(frame);
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buffer.feed(
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dry + fb_s * denorm::Delay::fb(fb, frame));
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let out_sample =
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buffer.cubic_interpolate_at(
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denorm::Delay::time(time, frame));
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out.write(frame,
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dcblock.next(
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crossfade(dry, out_sample,
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denorm::Delay::mix(mix, frame).clamp(0.0, 1.0))));
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fb_s = out_sample;
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}
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self.fb_sample = fb_s;
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}
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}
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