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|
use crate::{
RetainPluginMainThread, RetainPluginShared, params::RetainParams,
retain::retain_top_n_magnitudes, window_size::WindowSize, window_type::WindowType,
windowed_fft::WindowedRealFft,
};
use clack_extensions::{
audio_ports::{
AudioPortFlags, AudioPortInfo, AudioPortInfoWriter, AudioPortType, PluginAudioPortsImpl,
},
latency::HostLatency,
params::PluginAudioProcessorParams,
};
use clack_plugin::prelude::*;
use std::sync::Arc;
/// Our plugin's audio processor. It lives in the audio thread.
///
/// It receives parameter events, and process a stereo audio signal by operating on the given audio
/// buffer.
pub struct RetainPluginAudioProcessor<'a> {
/// The local state of the parameters
params: Arc<RetainParams>,
/// A reference to the plugin's shared data.
shared: &'a RetainPluginShared<'a>,
/// Our handle to the host
host: HostAudioProcessorHandle<'a>,
/// Fft for the left channel
fft_left: WindowedRealFft,
/// Fft for the right channel
fft_right: WindowedRealFft,
/// Previous window type
prev_window_type: Option<WindowType>,
/// Previous window size
prev_window_size: Option<WindowSize>,
}
impl<'a> PluginAudioProcessor<'a, RetainPluginShared<'a>, RetainPluginMainThread<'a>>
for RetainPluginAudioProcessor<'a>
{
fn activate(
host: HostAudioProcessorHandle<'a>,
_main_thread: &mut RetainPluginMainThread,
shared: &'a RetainPluginShared<'a>,
_audio_config: PluginAudioConfiguration,
) -> Result<Self, PluginError> {
let params = Arc::clone(&shared.params);
let fft_left = WindowedRealFft::new(params.get_window_size());
let fft_right = WindowedRealFft::new(params.get_window_size());
// This is where we would allocate intermediate buffers and such if we needed them.
Ok(Self {
params,
shared,
host,
fft_left,
fft_right,
prev_window_size: None,
prev_window_type: None,
})
}
fn process(
&mut self,
_process: Process,
mut audio: Audio,
events: Events,
) -> Result<ProcessStatus, PluginError> {
// Ensure at least a single input/output port pair, which contains channels of `f32`
// audio sample data.
let mut port_pair = audio
.port_pair(0)
.ok_or(PluginError::Message("No input/output ports found"))?;
let mut output_channels = port_pair
.channels()?
.into_f32()
.ok_or(PluginError::Message("Expected f32 input/output"))?;
// Extract the buffer slices that we need, while making sure they are paired correctly and
// check for either in-place or separate buffers.
let mut output_buffers = [None, None];
for (pair, buf) in output_channels.iter_mut().zip(&mut output_buffers) {
*buf = match pair {
ChannelPair::InputOnly(_) | ChannelPair::OutputOnly(_) => None,
ChannelPair::InPlace(b) => Some(b),
ChannelPair::InputOutput(i, o) => {
o.copy_from_slice(i);
Some(o)
}
}
}
// update window size and latency if it has changed
// updates fft window sizes only if necessary
let window_size = self.params.get_window_size();
if self.prev_window_size != Some(window_size.clone()) {
self.fft_left.window_size(window_size.clone());
self.fft_right.window_size(window_size.clone());
if let Some(latency) = self.shared.host.get_extension::<HostLatency>() {
// SAFETY: should be safe as self.shared.host is a shared
// version of the main thread handle
// no reason to propagate it through all these layers
let mut main = unsafe { self.shared.host.as_main_thread_unchecked() };
latency.changed(&mut main);
// self.shared.host.request_restart();
}
self.prev_window_size = Some(window_size);
}
// update change in window type if needed
let window_type = self.params.get_window_type();
if self.prev_window_type != Some(window_type.clone()) {
self.fft_left.window_function(&window_type);
self.fft_right.window_function(&window_type);
self.prev_window_type = Some(window_type);
}
// process the audio
for event_batch in events.input.batch() {
for event in event_batch.events() {
self.params.handle_event(event);
}
// Get the parameters after all changes have been handled.
let order = self.params.get_order();
// this parameter is read-only and can only be changed in the UI
let complement = self.params.get_complement();
// process samples in place here
if let [Some(left), Some(right)] = &mut output_buffers {
let range = event_batch.sample_bounds();
for sample in &mut left[range] {
if self.fft_left.push_back_input(*sample) {
self.fft_left.forward();
retain_top_n_magnitudes(self.fft_left.get_spectrum(), order, complement);
self.fft_left.inverse();
self.fft_left.clear_input();
}
*sample = self.fft_left.pop_front_output();
}
for sample in &mut right[range] {
if self.fft_right.push_back_input(*sample) {
self.fft_right.forward();
retain_top_n_magnitudes(self.fft_right.get_spectrum(), order, complement);
self.fft_right.inverse();
self.fft_right.clear_input();
}
*sample = self.fft_right.pop_front_output();
}
}
}
// Publish any parameter changes we may have received back to the GUI.
// Request the on-main-thread callback, which we use to refresh the UI if it is open
self.host.request_callback();
Ok(ProcessStatus::ContinueIfNotQuiet)
}
}
impl PluginAudioPortsImpl for RetainPluginMainThread<'_> {
fn count(&mut self, _is_input: bool) -> u32 {
1
}
fn get(&mut self, index: u32, _is_input: bool, writer: &mut AudioPortInfoWriter) {
if index == 0 {
writer.set(&AudioPortInfo {
id: ClapId::new(0),
name: b"main",
channel_count: 2,
flags: AudioPortFlags::IS_MAIN,
port_type: Some(AudioPortType::STEREO),
in_place_pair: None,
});
}
}
}
impl PluginAudioProcessorParams for RetainPluginAudioProcessor<'_> {
fn flush(
&mut self,
input_parameter_changes: &InputEvents,
_output_parameter_changes: &mut OutputEvents,
) {
for event in input_parameter_changes {
self.params.handle_event(event);
}
}
}
|
