HexoDSP/src/dsp/node_ad.rs

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2021-06-13 06:48:42 +00:00
// 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};
#[macro_export]
macro_rules! fa_ad_mult { ($formatter: expr, $v: expr, $denorm_v: expr) => { {
let s =
match ($v.round() as usize) {
0 => "x1",
1 => "x10",
2 => "x100",
_ => "?",
};
write!($formatter, "{}", s)
} } }
/// A simple amplifier
#[derive(Debug, Clone)]
pub struct Ad {
}
impl Ad {
pub fn new(_nid: &NodeId) -> Self {
Self {
}
}
pub const inp : &'static str =
"Ad inp\nSignal input. If you don't connect this, and set this to 1.0 \
this will act as envelope signal generator. But you can also just \
route a signal directly through this of course.\nRange: (-1..1)\n";
pub const atk : &'static str =
"Ad atk\nAttack time of the envelope. You can extend the maximum \
range of this with the 'mult' setting.\nRange: (0..1)\n";
pub const dcy : &'static str =
"Ad atk\nDecay time of the envelope. You can extend the maximum \
range of this with the 'mult' setting.\nRange: (0..1)\n";
pub const ashp : &'static str =
"Ad ashp\nAttack shape. This allows you to change the shape \
of the attack stage from a logarithmic, to a linear and to an \
exponential shape.\nRange: (0..1)\n";
pub const dshp : &'static str =
"Ad dshp\nDecay shape. This allows you to change the shape \
of the decay stage from a logarithmic, to a linear and to an \
exponential shape.\nRange: (0..1)\n";
pub const mult : &'static str =
"Ad mult\nAttack and Decay time range multiplier. \
This will extend the maximum range of the 'atk' and 'dcy' parameters.";
pub const sig : &'static str =
"Ad sig\nEnvelope signal output. If a signal is sent to the 'inp' port, \
you will receive an attenuated signal here. If you set 'inp' to a \
fixed value (for instance 1.0), this will output an envelope signal \
in the range 0.0 to 'inp' (1.0).\nRange: (-1..1)\n";
pub const DESC : &'static str =
r#"Attack-Decay Envelope
This is a simple envelope offering an attack time and decay time with shape parameter.
"#;
pub const HELP : &'static str =
r#"Ad - Attack-Decay Envelope
"#;
}
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/*
struct {
srate_per_ms: f64,
value : f64 = 0.0;
inc : f64 = 0.0;
stage = 0;
last_time = 0.0;
target : f64 = 1.0;
shape = 0.5;
}
set_sample_rate(srate) { self.srate_per_ms = srate / 1000.0 }
// block start:
let mut shape_src =
match stage {
2 => dcy_shape,
_ => atk_shape,
};
let mut inc_time_src =
match stage {
2 => dcy,
_ => atk,
};
let mut mult : f64 =
if mult == 1 { 10.0 } else if mult == 2 {100.0 } else { 1.0};
// each frame:
if stage == 0 {
if trigger(trig_in) {
value = 0.0;
// transition to stage 1 (attack):
stage = 1;
target = 1.0;
shape_src = atk_shape;
inc_time_src = atk;
last_time = -1.0;
}
}
let cur_time = denorm(inc_time_src);
if last_time != cur_time {
inc =
(target - value)
/ ((cur_time as f64) * mult * srate_per_ms);
}
value += inc;
shape = read(frame, shape_src).clamp(0.0, 1.0);
match stage {
1 => {
if value >= target {
// transition to stage 2 (decay):
stage = 2;
target = 0.0;
shape_src = dcy_shape;
inc_time_src = dcy;
last_time = -1.0;
}
},
2 => {
if value <= target {
stage = 0;
eov_trigger.trigger();
}
},
_ => {},
}
let in_val = inp.read(frame);
out.write(
frame,
in_val
* sqrt4_to_pow4(
value.clamp(0.0, 1.0) as f32, shape));
trig.write(frame, eov_trigger.next());
*/
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impl DspNode for Ad {
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,
atoms: &[SAtom], _params: &[ProcBuf], 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);
}
}