HexoDSP/src/dsp/node_delay.rs

143 lines
4.8 KiB
Rust

// Copyright (c) 2021 Weird Constructor <weirdconstructor@gmail.com>
// This is a part of HexoDSP. Released under (A)GPLv3 or any later.
// See README.md and COPYING for details.
use crate::nodes::{NodeAudioContext, NodeExecContext};
use crate::dsp::{NodeId, SAtom, ProcBuf, DspNode, LedPhaseVals, NodeContext};
use crate::dsp::helpers::{DelayBuffer, crossfade, TriggerSampleClock};
#[macro_export]
macro_rules! fa_delay_mode { ($formatter: expr, $v: expr, $denorm_v: expr) => { {
let s =
match ($v.round() as usize) {
0 => "Time",
1 => "Sync",
_ => "?",
};
write!($formatter, "{}", s)
} } }
/// A simple amplifier
#[derive(Debug, Clone)]
pub struct Delay {
buffer: Box<DelayBuffer>,
clock: TriggerSampleClock,
}
impl Delay {
pub fn new(_nid: &NodeId) -> Self {
Self {
buffer: Box::new(DelayBuffer::new()),
clock: TriggerSampleClock::new(),
}
}
pub const inp : &'static str =
"Delay inp\nThe signal input for the delay. You can mix in this \
input to the output with the 'mix' parameter.\nRange: (-1..1)";
pub const trig : &'static str =
"Delay trig\nIf you set 'mode' to 'Sync', the delay time will be \
synchronized to the trigger signals received on this input.\nRange: (-1..1)";
pub const time : &'static str =
"Delay time\nThe delay time. It can be freely modulated to your \
likings.\nRange: (0..1)";
pub const fb : &'static str =
"Delay fb\nThe feedback amount of the delay output to it's input. \
\nRange: (-1..1)";
pub const mix : &'static str =
"Delay mix\nThe dry/wet mix of the delay.\nRange: (0..1)";
pub const mode : &'static str =
"Delay mode\nAllows different operating modes of the delay. \
'Time' is the default, and means that the 'time' input \
specifies the delay time. 'Sync' will synchronize the delay time \
with the trigger signals on the 'trig' input.";
pub const sig : &'static str =
"Delay sig\nThe output of the dry/wet mix.\nRange: (-1..1)";
pub const DESC : &'static str =
r#"Simple Delay Line
This is a very simple single buffer delay node.
It provides an internal feedback and dry/wet mix.
"#;
pub const HELP : &'static str =
r#"Delay - A Simple Delay Line
This node provides a very simple delay line with the bare minimum of
parameters. Most importantly a freely modulateable 'time' parameter
and a feedback 'fb' parameter.
Via the 'mix' parameter you can mix in the input signal to the output.
You can use this node to delay any kind of signal, from a simple control
signal to an audio signal.
For other kinds of delay/feedback please see also the 'FbWr'/'FbRd' nodes.
"#;
}
impl DspNode for Delay {
fn outputs() -> usize { 1 }
fn set_sample_rate(&mut self, srate: f32) {
self.buffer.set_sample_rate(srate);
}
fn reset(&mut self) {
self.buffer.reset();
self.clock.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, out, inp, denorm};
let buffer = &mut *self.buffer;
let mode = at::Delay::mode(atoms);
let inp = inp::Delay::inp(inputs);
let trig = inp::Delay::trig(inputs);
let time = inp::Delay::time(inputs);
let fb = inp::Delay::fb(inputs);
let mix = inp::Delay::mix(inputs);
let out = out::Delay::sig(outputs);
if mode.i() == 0 {
for frame in 0..ctx.nframes() {
let dry = inp.read(frame);
let out_sample =
buffer.cubic_interpolate_at(
denorm::Delay::time(time, frame));
buffer.feed(dry + out_sample * denorm::Delay::fb(fb, frame));
out.write(frame,
crossfade(dry, out_sample,
denorm::Delay::mix(mix, frame).clamp(0.0, 1.0)));
}
} else {
for frame in 0..ctx.nframes() {
let dry = inp.read(frame);
let clock_samples =
self.clock.next(denorm::Delay::trig(trig, frame));
let out_sample = buffer.at(clock_samples as usize);
buffer.feed(dry + out_sample * denorm::Delay::fb(fb, frame));
out.write(frame,
crossfade(dry, out_sample,
denorm::Delay::mix(mix, frame).clamp(0.0, 1.0)));
}
}
let last_frame = ctx.nframes() - 1;
ctx_vals[0].set(out.read(last_frame));
}
}