HexoDSP/src/dsp/node_sampl.rs

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// 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;
use crate::dsp::{SAtom, ProcBuf, DspNode, LedPhaseVals};
/// A simple amplifier
#[derive(Debug, Clone)]
pub struct Sampl {
phase: f64,
srate: f64,
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}
impl Sampl {
pub fn new() -> Self {
Self {
phase: 0.0,
srate: 44100.0,
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}
}
pub const freq : &'static str =
"Sampl freq\nPitch input for the sampler, giving the playback speed of the \
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sample.\nRange: (-1..1)\n";
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pub const trig : &'static str =
"Sampl trig\nThe trigger input causes a resync of the playback phase \
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and triggers the playback if the 'pmode' is 'OneShot'";
pub const spos : &'static str =
"Sampl spos\nStart position offset.\nRange: (-1..1)\n";
pub const epos : &'static str =
"Sampl epos\nEnd position offset.\nRange: (-1..1)\n";
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pub const sample : &'static str =
"Sampl sample\nThe audio sample that is played back.\nRange: (-1..1)\n";
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pub const pmode : &'static str =
"Sampl pmode\nThe playback mode of the sampler.\n\
- 'Loop' constantly plays back the sample. You can reset/sync the phase \
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using the 'trig' input in this case.\n\
- 'OneShot' plays back the sample if a trigger is received on 'trig' input.\n";
pub const dclick : &'static str =
"Sampl dclick\nIf this is enabled and the 'pmode' is 'OneShot' \
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this will enable short fade in and out ramps.\n\
This if useful if you don't want to add an envelope just for \
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getting rid of the clicks if spos and epos are modulated.";
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pub const sig : &'static str =
"Sampl sig\nSampler audio output\nRange: (-1..1)\n";
}
impl DspNode for Sampl {
fn outputs() -> usize { 1 }
fn set_sample_rate(&mut self, srate: f32) { self.srate = srate.into(); }
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fn reset(&mut self) { }
#[inline]
fn process<T: NodeAudioContext>(
&mut self, ctx: &mut T, atoms: &[SAtom], _params: &[ProcBuf],
inputs: &[ProcBuf], outputs: &mut [ProcBuf], ctx_vals: LedPhaseVals)
{
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use crate::dsp::{out, at, inp, denorm}; //, inp, denorm, denorm_v, inp_dir, at};
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let sample = at::Sampl::sample(atoms);
let freq = inp::Sampl::freq(inputs);
let out = out::Sampl::sig(outputs);
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if let SAtom::AudioSample((_, Some(sample_data))) = sample {
let sd_len = sample_data.len() - 1;
let sd_len_f = sd_len as f64;
let sample_srate = sample_data[0] as f64;
let sample_data = &sample_data[1..];
let sr_factor = sample_srate / self.srate;
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for frame in 0..ctx.nframes() {
let playback_speed =
denorm::Sampl::freq(freq, frame) / 440.0;
let i = self.phase.floor() as usize + sd_len;
// Hermite interpolation, take from
// https://github.com/eric-wood/delay/blob/main/src/delay.rs#L52
//
// Thanks go to Eric Wood!
//
// For the interpolation code:
// MIT License, Copyright (c) 2021 Eric Wood
let xm1 = sample_data[(i - 1) % sd_len];
let x0 = sample_data[i % sd_len];
let x1 = sample_data[(i + 1) % sd_len];
let x2 = sample_data[(i + 2) % sd_len];
let c = (x1 - xm1) * 0.5;
let v = x0 - x1;
let w = c + v;
let a = w + v + (x2 - x0) * 0.5;
let b_neg = w + a;
let f = self.phase.fract() as f32;
let out_sample = (((a * f) - b_neg) * f + c) * f + x0;
out.write(frame, out_sample);
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self.phase += sr_factor * playback_speed as f64;
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}
} else {
for frame in 0..ctx.nframes() {
out.write(frame, 0.0);
}
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}
ctx_vals[0].set(1.0);
// 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)
// };
}
}