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Add back symmetrical AM

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This commit is contained in:
Robbert van der Helm 2022-03-08 23:46:05 +01:00
parent 55315fb7f3
commit e8301f6c9d
1 changed files with 25 additions and 2 deletions
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27
plugins/crisp/src/lib.rs
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@ -45,12 +45,29 @@ pub struct CrispParams {
/// On a range of `[0, 1]`, how much of the modulated sound to mix in.
#[id = "amount"]
amount: FloatParam,
/// What kind of AM to apply. The preset this was modelled after whether intentional or not only
/// AMs the positive part of the waveform.
#[id = "mode"]
mode: EnumParam<Mode>,
/// Output gain, as voltage gain. Displayed in decibels.
#[id = "output"]
output_gain: FloatParam,
}
/// Controls the type of modulation to apply.
#[derive(Enum, Debug, PartialEq)]
enum Mode {
/// AM the entire waveform.
Crispy,
/// AM only the positive part of the waveform.
#[name = "Even Crispier"]
EvenCrispier,
/// AM only the negative part of the waveform.
#[name = "Even Crispier (alt)"]
EvenCrispierNegated,
}
impl Default for Crisp {
fn default() -> Self {
Self {
@ -70,6 +87,7 @@ impl Default for CrispParams {
.with_unit("%")
.with_value_to_string(formatters::f32_percentage(0))
.with_string_to_value(formatters::from_f32_percentage()),
mode: EnumParam::new("Mode", Mode::EvenCrispier),
output_gain: FloatParam::new(
"Output",
1.0,
@ -131,9 +149,14 @@ impl Plugin for Crisp {
// TODO: SIMD-ize this to process both channels at once
for sample in channel_samples.into_iter() {
let noise = self.prng.next_f32() * 2.0 - 1.0;
let half_am = sample.max(0.0) * noise;
// TODO: Avoid branching here later
let am_result = match self.params.mode.value() {
Mode::Crispy => *sample * noise,
Mode::EvenCrispier => sample.max(0.0) * noise,
Mode::EvenCrispierNegated => sample.max(0.0) * noise,
};
*sample += half_am * amount;
*sample += am_result * amount;
*sample *= output_gain;
}
}