123 lines
4 KiB
Rust
123 lines
4 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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#[macro_export]
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macro_rules! fa_amp_neg_att { ($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 => "Allow",
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1 => "Clip",
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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 Amp {
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}
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impl Amp {
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pub fn new(_nid: &NodeId) -> Self {
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Self {
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}
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}
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pub const inp : &'static str =
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"Amp inp\nSignal input\nRange: (-1..1)\n";
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pub const att : &'static str =
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"Amp att\nAttenuate input. Does only attenuate the signal, not amplify it.\n\
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Use this for envelope input.\nRange: (0..1)\n";
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pub const gain : &'static str =
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"Amp gain\nGain input. This control can actually amplify the signal.\nRange: (0..1)\n";
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pub const neg_att : &'static str =
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"Amp neg\nIf this is set to 'Clip', only positive inputs to 'att' are used.\nRange: (0..1)\n";
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pub const sig : &'static str =
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"Amp sig\nAmplified signal output\nRange: (-1..1)\n";
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pub const DESC : &'static str =
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r#"Signal Amplifier
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This is a simple amplifier to amplify or attenuate a signal.
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See also nodes like 'atv' for an Attenuverter or 'mix' for mixing signals.
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"#;
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pub const HELP : &'static str =
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r#"Amp - Signal Amplifier
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It serves the simple purpose of taking an input signal and attenuate (either
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with the 'att' or the 'gain' parameter) or just amplifying it with
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the 'gain' parameter.
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You can even use it as simple fixed control signal source if you leave the
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'inp' port unconnected and just dial in the desired output value with the
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parameter.
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The main idea with the 'gain' and 'att' parameters is, that you can set
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the desired amplification with the 'gain' parameter and automate it using
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the 'att' parameter. The 'neg' setting then defines what happens with
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negative inputs on the 'att' port.
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"#;
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}
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impl DspNode for Amp {
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fn outputs() -> usize { 1 }
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fn set_sample_rate(&mut self, _srate: f32) { }
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fn reset(&mut self) { }
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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, denorm_v, inp_dir, at};
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let gain = inp::Amp::gain(inputs);
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let att = inp::Amp::att(inputs);
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let inp = inp::Amp::inp(inputs);
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let out = out::Amp::sig(outputs);
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let neg = at::Amp::neg_att(atoms);
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let last_frame = ctx.nframes() - 1;
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let last_val =
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if neg.i() > 0 {
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for frame in 0..ctx.nframes() {
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out.write(frame,
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inp.read(frame)
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* denorm_v::Amp::att(
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inp_dir::Amp::att(att, frame)
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.max(0.0))
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* denorm::Amp::gain(gain, frame));
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}
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inp.read(last_frame)
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* denorm_v::Amp::att(
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inp_dir::Amp::att(att, last_frame)
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.max(0.0))
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* denorm::Amp::gain(gain, last_frame)
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} else {
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for frame in 0..ctx.nframes() {
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out.write(frame,
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inp.read(frame)
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* denorm_v::Amp::att(
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inp_dir::Amp::att(att, frame).abs())
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* denorm::Amp::gain(gain, frame));
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}
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inp.read(last_frame)
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* denorm_v::Amp::att(
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inp_dir::Amp::att(att, last_frame).abs())
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* denorm::Amp::gain(gain, last_frame)
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};
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ctx_vals[0].set(last_val);
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}
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}
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