153 lines
5.4 KiB
Rust
153 lines
5.4 KiB
Rust
// Copyright (c) 2021 Weird Constructor <weirdconstructor@gmail.com>
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// This is a part of HexoDSP. Released under (A)GPLv3 or any later.
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// See README.md and COPYING for details.
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use crate::nodes::NodeAudioContext;
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use crate::dsp::{SAtom, ProcBuf, DspNode, LedPhaseVals};
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/// A simple amplifier
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#[derive(Debug, Clone)]
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pub struct Sampl {
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phase: f64,
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srate: f64,
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}
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impl Sampl {
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pub fn new() -> Self {
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Self {
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phase: 0.0,
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srate: 44100.0,
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}
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}
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pub const freq : &'static str =
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"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 =
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"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'";
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pub const spos : &'static str =
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"Sampl spos\nStart position offset.\nRange: (-1..1)\n";
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pub const epos : &'static str =
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"Sampl epos\nEnd position offset.\nRange: (-1..1)\n";
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pub const sample : &'static str =
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"Sampl sample\nThe audio sample that is played back.\nRange: (-1..1)\n";
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pub const pmode : &'static str =
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"Sampl pmode\nThe playback mode of the sampler.\n\
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- 'Loop' constantly plays back the sample. You can reset/sync the phase \
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using the 'trig' input in this case.\n\
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- 'OneShot' plays back the sample if a trigger is received on 'trig' input.\n";
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pub const dclick : &'static str =
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"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\
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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 =
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"Sampl sig\nSampler audio output\nRange: (-1..1)\n";
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}
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impl DspNode for Sampl {
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fn outputs() -> usize { 1 }
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fn set_sample_rate(&mut self, srate: f32) { self.srate = srate.into(); }
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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, atoms: &[SAtom], _params: &[ProcBuf],
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inputs: &[ProcBuf], outputs: &mut [ProcBuf], ctx_vals: LedPhaseVals)
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{
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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);
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let freq = inp::Sampl::freq(inputs);
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let out = out::Sampl::sig(outputs);
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if let SAtom::AudioSample((_, Some(sample_data))) = sample {
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let sd_len = sample_data.len() - 1;
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let sd_len_f = sd_len as f64;
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let sample_srate = sample_data[0] as f64;
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let sample_data = &sample_data[1..];
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let sr_factor = sample_srate / self.srate;
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for frame in 0..ctx.nframes() {
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let playback_speed =
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denorm::Sampl::freq(freq, frame) / 440.0;
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let i = self.phase.floor() as usize + sd_len;
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// Hermite interpolation, take from
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// https://github.com/eric-wood/delay/blob/main/src/delay.rs#L52
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//
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// Thanks go to Eric Wood!
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//
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// For the interpolation code:
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// MIT License, Copyright (c) 2021 Eric Wood
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let xm1 = sample_data[(i - 1) % sd_len];
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let x0 = sample_data[i % sd_len];
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let x1 = sample_data[(i + 1) % sd_len];
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let x2 = sample_data[(i + 2) % sd_len];
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let c = (x1 - xm1) * 0.5;
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let v = x0 - x1;
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let w = c + v;
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let a = w + v + (x2 - x0) * 0.5;
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let b_neg = w + a;
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let f = self.phase.fract() as f32;
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let out_sample = (((a * f) - b_neg) * f + c) * f + x0;
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out.write(frame, out_sample);
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self.phase += sr_factor * playback_speed as f64;
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}
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} else {
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for frame in 0..ctx.nframes() {
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out.write(frame, 0.0);
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}
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}
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ctx_vals[0].set(1.0);
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// let neg = at::Amp::neg_att(atoms);
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//
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// let last_frame = ctx.nframes() - 1;
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//
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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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//
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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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//
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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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//
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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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}
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}
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