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Support VST3 parameter flushes

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This commit is contained in:
Robbert van der Helm 2022-01-30 01:50:22 +01:00
parent 6ddae6a506
commit 16238f1e00
1 changed files with 34 additions and 31 deletions
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65
src/wrapper/vst3.rs
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@ -733,11 +733,44 @@ impl<P: Plugin> IAudioProcessor for Wrapper<'_, P> {
unsafe fn process(&self, data: *mut vst3_sys::vst::ProcessData) -> tresult {
check_null_ptr!(data);
// We need to handle incoming automation first
let data = &*data;
if let Some(param_changes) = data.input_param_changes.upgrade() {
let num_param_queues = param_changes.get_parameter_count();
for change_queue_idx in 0..num_param_queues {
if let Some(param_change_queue) =
param_changes.get_parameter_data(change_queue_idx).upgrade()
{
let param_hash = param_change_queue.get_parameter_id();
let num_changes = param_change_queue.get_point_count();
// TODO: Handle sample accurate parameter changes, possibly in a similar way to
// the smoothing
let mut sample_offset = 0i32;
let mut value = 0.0f64;
if num_changes > 0
&& param_change_queue.get_point(
num_changes - 1,
&mut sample_offset,
&mut value,
) == kResultOk
{
self.set_normalized_value_by_hash(param_hash, value);
}
}
}
}
// It's possible the host only wanted to send new parameter values
if data.num_outputs == 0 {
nih_log!("VST3 parameter flush");
return kResultOk;
}
// The setups we suppport are:
// - 1 input bus
// - 1 output bus
// - 1 input bus and 1 output bus
let data = &*data;
nih_debug_assert!(
data.num_inputs >= 0
&& data.num_inputs <= 1
@ -750,10 +783,6 @@ impl<P: Plugin> IAudioProcessor for Wrapper<'_, P> {
vst3_sys::vst::SymbolicSampleSizes::kSample32 as i32
);
nih_debug_assert!(data.num_samples >= 0);
if data.num_outputs < 1 {
nih_debug_assert_failure!("The host doesn't provide any outputs");
return kInvalidArgument;
}
// This vector has been reallocated to contain enough slices as there are output channels
let mut output_slices = self.output_slices.borrow_mut();
@ -796,32 +825,6 @@ impl<P: Plugin> IAudioProcessor for Wrapper<'_, P> {
}
}
if let Some(param_changes) = data.input_param_changes.upgrade() {
let num_param_queues = param_changes.get_parameter_count();
for change_queue_idx in 0..num_param_queues {
if let Some(param_change_queue) =
param_changes.get_parameter_data(change_queue_idx).upgrade()
{
let param_hash = param_change_queue.get_parameter_id();
let num_changes = param_change_queue.get_point_count();
// TODO: Handle sample accurate parameter changes, possibly in a similar way to
// the smoothing
let mut sample_offset = 0i32;
let mut value = 0.0f64;
if num_changes > 0
&& param_change_queue.get_point(
num_changes - 1,
&mut sample_offset,
&mut value,
) == kResultOk
{
self.set_normalized_value_by_hash(param_hash, value);
}
}
}
}
match self.plugin.borrow_mut().process(&mut output_slices) {
ProcessStatus::Error(err) => {
nih_debug_assert_failure!("Process error: {}", err);