122 lines
3.7 KiB
Rust
122 lines
3.7 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::Rng;
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#[macro_export]
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macro_rules! fa_noise_mode { ($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 => "Bipolar",
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1 => "Unipolar",
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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 Noise {
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seed: u64,
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rng: Rng,
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}
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impl Noise {
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pub fn new(nid: &NodeId) -> Self {
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let mut rng = Rng::new();
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rng.seed(
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(0x193a67f4a8a6d769_u64).wrapping_add(
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0x131415 * (nid.instance() as u64 + 1)));
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Self {
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seed: nid.instance() as u64,
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rng,
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}
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}
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pub const atv : &'static str =
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"Noise atv\n.Attenuverter input, to attenuate or invert \
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the noise.\nRange: (-1..1)";
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pub const offs : &'static str =
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"Noise offs\n.Offset input, that is added to the output \
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signal after attenuvertig it.\nRange: (-1..1)";
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pub const mode : &'static str =
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"Noise mode\nYou can switch between 'Bipolar' noise, which \
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uses the full range from -1 to 1, or 'Unipolar' noise that \
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only uses the range from 0 to 1.";
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pub const sig : &'static str =
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"Noise sig\nThe noise output.\nRange: (-1..1)";
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pub const DESC : &'static str =
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r#"Noise Oscillator
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This is a very simple noise oscillator, which can be used for any kind of audio rate noise.
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And as a source for sample & hold like nodes to generate low frequency modulation.
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"#;
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pub const HELP : &'static str =
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r#"Noise - A Simple Noise Oscillator
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This is a very simple noise oscillator, which can be used for
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any kind of audio rate noise. And as a source for sample & hold
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like nodes to generate low frequency modulation.
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The 'atv' attenuverter and 'offs' parameters control the value range
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of the noise, and the 'mode' allows to switch the oscillator between
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unipolar and bipolar output.
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"#;
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}
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impl DspNode for Noise {
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fn outputs() -> usize { 1 }
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fn set_sample_rate(&mut self, _srate: f32) {
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}
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fn reset(&mut self) {
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self.rng.seed(
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(0x193a67f4a8a6d769_u64).wrapping_add(
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0x131415 * (self.seed + 1)));
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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::{at, out, inp, denorm};
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let mode = at::Noise::mode(atoms);
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let atv = inp::Noise::atv(inputs);
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let offs = inp::Noise::offs(inputs);
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let out = out::Noise::sig(outputs);
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let rng = &mut self.rng;
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if mode.i() == 0 {
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for frame in 0..ctx.nframes() {
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let s = (rng.next() * 2.0) - 1.0;
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let s = s
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* denorm::Noise::atv(atv, frame)
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+ denorm::Noise::offs(offs, frame);
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out.write(frame, s);
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}
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} else {
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for frame in 0..ctx.nframes() {
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let s = rng.next()
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* denorm::Noise::atv(atv, frame)
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+ denorm::Noise::offs(offs, frame);
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out.write(frame, s);
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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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