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extract fn switchover

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🪞👃🪞 2024-11-02 23:28:46 +02:00
parent b2680914d7
commit 0c850913f9
1 changed files with 37 additions and 26 deletions
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63
crates/tek_sequencer/src/sequencer_snd.rs
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@ -17,7 +17,9 @@ impl Audio for PhrasePlayer {
// Clear output buffer(s)
self.clear(scope, false);
// Write chunk of phrase to output, handle switchover
self.play(scope);
if self.play(scope) {
self.switchover(scope);
}
if has_midi_inputs {
if self.recording || self.monitoring {
// Record and/or monitor input
@ -34,8 +36,15 @@ impl Audio for PhrasePlayer {
}
/// Methods used primarily by the process callback
impl PhrasePlayer {
fn has_midi_inputs (&self) -> bool { self.midi_inputs.len() > 0 }
fn has_midi_outputs (&self) -> bool { self.midi_outputs.len() > 0 }
fn is_rolling (&self) -> bool {
*self.clock.playing.read().unwrap() == Some(TransportState::Rolling)
}
fn has_midi_inputs (&self) -> bool {
self.midi_inputs.len() > 0
}
fn has_midi_outputs (&self) -> bool {
self.midi_outputs.len() > 0
}
/// Clear the section of the output buffer that we will be using,
/// emitting "all notes off" at start of buffer if requested.
fn clear (&mut self, scope: &ProcessScope, force_reset: bool) {
@ -46,16 +55,14 @@ impl PhrasePlayer {
all_notes_off(&mut self.midi_out_buf); self.reset = false;
}
}
fn is_rolling (&self) -> bool {
*self.clock.playing.read().unwrap() == Some(TransportState::Rolling)
}
fn play (&mut self, scope: &ProcessScope) {
fn play (&mut self, scope: &ProcessScope) -> bool {
let sample0 = scope.last_frame_time() as usize;
let samples = scope.n_frames() as usize;
let mut next = false;
// Write MIDI events from currently playing phrase (if any) to MIDI output buffer
if self.is_rolling() {
// If no phrase is playing, prepare for switchover immediately
let mut next = self.phrase.is_none();
next = self.phrase.is_none();
if let Some((started, phrase)) = &self.phrase {
// First sample to populate. Greater than 0 means that the first
// pulse of the phrase falls somewhere in the middle of the chunk.
@ -105,25 +112,29 @@ impl PhrasePlayer {
}
}
}
// If it's time for the next enqueued phrase, handle it here:
if next {
if let Some((start_at, phrase)) = &self.next_phrase {
let start = start_at.sample.get() as usize;
// If it's time to switch to the next phrase:
if start <= sample0.saturating_sub(
self.clock.started.read().unwrap().unwrap().0
) {
// Samples elapsed since phrase was supposed to start
let skipped = sample0 - start;
// Switch over to enqueued phrase
let started = Instant::from_sample(&self.clock.timebase(), start as f64);
self.phrase = Some((started, phrase.clone()));
// Unset enqueuement (TODO: where to implement looping?)
self.next_phrase = None
}
// TODO fill in remaining ticks of chunk from next phrase.
// ?? just call self.play(scope) again, since enqueuement is off ???
}
next
}
fn switchover (&mut self, scope: &ProcessScope) {
let sample0 = scope.last_frame_time() as usize;
let samples = scope.n_frames() as usize;
if self.is_rolling() {
if let Some((start_at, phrase)) = &self.next_phrase {
let start = start_at.sample.get() as usize;
// If it's time to switch to the next phrase:
if start <= sample0.saturating_sub(
self.clock.started.read().unwrap().unwrap().0
) {
// Samples elapsed since phrase was supposed to start
let skipped = sample0 - start;
// Switch over to enqueued phrase
let started = Instant::from_sample(&self.clock.timebase(), start as f64);
self.phrase = Some((started, phrase.clone()));
// Unset enqueuement (TODO: where to implement looping?)
self.next_phrase = None
}
// TODO fill in remaining ticks of chunk from next phrase.
// ?? just call self.play(scope) again, since enqueuement is off ???
}
}
}