Add a fadeout start to Safety Limiter
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@ -17,9 +17,13 @@
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use nih_plug::prelude::*;
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use std::sync::Arc;
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/// After reaching the threshold, it will take this many milliseconds under that threshold to fade
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/// back to the normal signal. Peaking above the threshold again during this time resets this.
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const MORSE_FADEOUT_MS: f32 = 2000.0;
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/// After reaching the threshold, it will take this many milliseconds under that threshold to start
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/// fading back to the normal signal. Peaking above the threshold again during this time resets
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/// this. The fadeout doesn't start immediately since that would add some nasty distortion when most
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/// but not all samples pass the threshold.
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const MORSE_FADEOUT_START_MS: f32 = 500.0;
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/// The Morse fadeout ends after this many milliseconds.
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const MORSE_FADEOUT_END_MS: f32 = MORSE_FADEOUT_START_MS + 1500.0;
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/// The frequency of the sine wave used for the SOS signal.
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const MORSE_FREQUENCY: f32 = 420.0;
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@ -28,8 +32,10 @@ struct SafetyLimiter {
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buffer_config: BufferConfig,
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/// `MORSE_FADEOUT_MS` translated into samples.
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morse_fadeout_samples_total: u32,
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/// `MORSE_FADEOUT_START_MS` translated into samples.
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morse_fadeout_samples_start: u32,
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/// `MORSE_FADEOUT_END_MS` translated into samples.
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morse_fadeout_samples_end: u32,
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/// The number of samples into the fadeout.
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morse_fadeout_samples_current: u32,
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@ -80,7 +86,8 @@ impl Default for SafetyLimiter {
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process_mode: ProcessMode::Realtime,
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},
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morse_fadeout_samples_total: 0,
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morse_fadeout_samples_start: 0,
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morse_fadeout_samples_end: 0,
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morse_fadeout_samples_current: 0,
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osc_phase_tau: 0.0,
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@ -115,15 +122,17 @@ impl Plugin for SafetyLimiter {
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_context: &mut impl ProcessContext,
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) -> bool {
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self.buffer_config = *buffer_config;
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self.morse_fadeout_samples_total =
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(MORSE_FADEOUT_MS / 1000.0 * buffer_config.sample_rate).round() as u32;
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self.morse_fadeout_samples_start =
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(MORSE_FADEOUT_START_MS / 1000.0 * buffer_config.sample_rate).round() as u32;
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self.morse_fadeout_samples_end =
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(MORSE_FADEOUT_END_MS / 1000.0 * buffer_config.sample_rate).round() as u32;
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self.osc_phase_tau_dt = MORSE_FREQUENCY / buffer_config.sample_rate * std::f32::consts::TAU;
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true
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}
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fn reset(&mut self) {
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self.morse_fadeout_samples_current = self.morse_fadeout_samples_total;
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self.morse_fadeout_samples_current = self.morse_fadeout_samples_end;
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self.reset_morse_signal();
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}
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@ -147,7 +156,7 @@ impl Plugin for SafetyLimiter {
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if is_peaking {
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// We'll continue playback where it was left off when this gets triggered before the
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// fadeout has finished, but otherwise the sequence should be restarted.
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if self.morse_fadeout_samples_current >= self.morse_fadeout_samples_total {
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if self.morse_fadeout_samples_current >= self.morse_fadeout_samples_end {
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self.reset_morse_signal();
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}
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@ -155,7 +164,7 @@ impl Plugin for SafetyLimiter {
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self.morse_fadeout_samples_current = 0;
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}
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if self.morse_fadeout_samples_current < self.morse_fadeout_samples_total {
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if self.morse_fadeout_samples_current < self.morse_fadeout_samples_end {
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// This phase runs from 0 to `2 * pi` as an optimization, so we can use it directly.
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// And the sine wave is scaled down to the threshold minus 12 dB
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let sine_wave =
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@ -165,9 +174,14 @@ impl Plugin for SafetyLimiter {
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self.osc_phase_tau -= std::f32::consts::TAU;
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}
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let original_t = (self.morse_fadeout_samples_current as f32
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/ self.morse_fadeout_samples_total as f32)
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.cbrt();
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let original_t = if self.morse_fadeout_samples_current
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< self.morse_fadeout_samples_start
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{
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0.0
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} else {
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(self.morse_fadeout_samples_current - self.morse_fadeout_samples_start) as f32
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/ (self.morse_fadeout_samples_end - self.morse_fadeout_samples_start) as f32
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};
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let morse_t = 1.0 - original_t;
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for sample in channel_samples {
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*sample = (sine_wave * morse_t) + (*sample * original_t);
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