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