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Don't propagate parameter changes while processing

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Let the host do this, this would solve all unsoundness issues and
potential collisions.
This commit is contained in:
Robbert van der Helm 2022-02-06 14:15:43 +01:00
parent ea18f62d02
commit 7000e9d42e
1 changed files with 12 additions and 7 deletions
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19
src/wrapper/vst3.rs
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@ -225,13 +225,18 @@ impl<P: Plugin> GuiContext for WrapperInner<P> {
match &*self.component_handler.read() {
Some(handler) => match self.param_ptr_to_hash.get(&param) {
Some(hash) => {
// XXX: The host will also report this value to the plugin, this may cause fun
// behaviour with rapid parameter changes. How does JUCE handle this?
self.set_normalized_value_by_hash(
*hash,
normalized,
self.current_buffer_config.load().map(|c| c.sample_rate),
);
// Only update the parameters manually if the host is not processing audio. If
// the plugin is currently processing audio, the host will pass this change back
// to the plugin in the audio callback. This also prevents the values from
// changing in the middle of the process callback, which would be unsound.
if !self.is_processing.load(Ordering::SeqCst) {
self.set_normalized_value_by_hash(
*hash,
normalized,
self.current_buffer_config.load().map(|c| c.sample_rate),
);
}
handler.perform_edit(*hash, normalized as f64);
}
None => nih_debug_assert_failure!("Unknown parameter: {:?}", param),