new buffer less and simpler style of midi event processing

src/dsp/node_midip.rs

@@ -5,7 +5,7 @@
 use crate::dsp::{
     at, denorm, inp, out_idx, DspNode, LedPhaseVals, NodeContext, NodeId, ProcBuf, SAtom,
 };
-use crate::nodes::{NodeAudioContext, NodeExecContext};
+use crate::nodes::{HxMidiEvent, MidiEventPointer, NodeAudioContext, NodeExecContext};
 
 #[macro_export]
 macro_rules! fa_midip_chan {
@@ -30,12 +30,15 @@ macro_rules! fa_midip_gmode {
 /// The (stereo) output port of the plugin
 #[derive(Debug, Clone)]
 pub struct MidiP {
-    prev_gate: u8,
+    next_gate: i8,
+    cur_note: u8,
+    cur_gate: u8,
+    cur_vel: f32,
 }
 
 impl MidiP {
     pub fn new(_nid: &NodeId) -> Self {
-        Self { prev_gate: 0 }
+        Self { next_gate: 0, cur_note: 0, cur_gate: 0, cur_vel: 0.0 }
     }
 
     pub const chan: &'static str = "MidiP chan\nMIDI Channel 0 to 15\n";
@@ -106,29 +109,54 @@ impl DspNode for MidiP {
         let gate = &mut gate[0];
         let vel = &mut vel[0];
 
-        let channel = (chan.i() as usize % 16) as u8;
+        let midip_channel = (chan.i() as usize % 16) as u8;
+
+        let mut ptr = MidiEventPointer::new(&ectx.midi_notes[..]);
 
         for frame in 0..ctx.nframes() {
-            let chan = ectx.note_buffer.get_chan_at(channel, frame as u8);
+            if self.next_gate > 0 {
+                self.cur_gate = 1;
+            } else if self.next_gate < 0 {
+                self.cur_gate = 0;
+            }
+            self.next_gate = 0;
 
-            let note = (chan.note as f32 - 69.0) / 120.0;
-            let note = note + det.read(frame);
-            freq.write(frame, note);
+            while let Some(ev) = ptr.next_at(frame) {
+                println!("MIDIP EV: {} {:?}", frame, ev);
+                match ev {
+                    HxMidiEvent::NoteOn { channel, note, vel } => {
+                        if channel != midip_channel {
+                            continue;
+                        }
 
-            if chan.gate & 0x10 > 0 {
-                // insert a single sample of silence, for retriggering
-                // any envelopes if the note changed but no note-off came.
-                if self.prev_gate > 0 && self.prev_gate != chan.gate {
-                    gate.write(frame, 0.0);
-                } else {
-                    gate.write(frame, 1.0);
+                        if self.cur_gate > 0 {
+                            self.next_gate = 1;
+                            self.cur_gate = 0;
+                        } else {
+                            self.cur_gate = 1;
+                        }
+                        self.cur_note = note;
+                        self.cur_vel = vel;
+                    }
+                    HxMidiEvent::NoteOff { channel, note } => {
+                        if channel != midip_channel {
+                            continue;
+                        }
+
+                        if self.cur_note == note {
+                            self.next_gate = -1;
+                        }
+                    }
+                    _ => (),
                 }
-            } else {
-                gate.write(frame, 0.0);
             }
 
-            self.prev_gate = chan.gate;
-            vel.write(frame, chan.vel as f32);
+            let note = (self.cur_note as f32 - 69.0) / 120.0;
+            let note = note + det.read(frame);
+            println!("FRAME: {} => gate={}, freq={}, next_gate={}", frame, self.cur_gate, note, self.next_gate);
+            freq.write(frame, note);
+            gate.write(frame, if self.cur_gate > 0 { 1.0 } else { 0.0 });
+            vel.write(frame, self.cur_vel as f32);
         }
 
         let last_val = gate.read(ctx.nframes() - 1);

src/nodes/mod.rs

@@ -31,7 +31,9 @@ pub use node_conf::*;
 pub use node_exec::*;
 pub use node_graph_ordering::NodeGraphOrdering;
 pub use node_prog::*;
-pub use note_buffer::{EventWindowing, HxMidiEvent, HxTimedEvent, NoteBuffer, NoteChannelState};
+pub use note_buffer::{
+    EventWindowing, HxMidiEvent, HxTimedEvent, MidiEventPointer, NoteBuffer, NoteChannelState,
+};
 
 use crate::dsp::{Node, SAtom};
 pub use crate::monitor::MinMaxMonitorSamples;

src/nodes/node_exec.rs

@@ -25,6 +25,9 @@ use core::arch::x86_64::{
     //    _MM_GET_FLUSH_ZERO_MODE
 };
 
+pub const MAX_MIDI_NOTES_PER_BLOCK: usize = 512;
+pub const MAX_MIDI_CC_PER_BLOCK: usize = 1024;
+
 /// Holds the complete allocation of nodes and
 /// the program. New Nodes or the program is
 /// not newly allocated in the audio backend, but it is
@@ -171,13 +174,17 @@ impl Default for FeedbackBuffer {
 pub struct NodeExecContext {
     pub feedback_delay_buffers: Vec<FeedbackBuffer>,
     pub note_buffer: NoteBuffer,
+    pub midi_notes: Vec<HxTimedEvent>,
+    pub midi_ccs: Vec<HxTimedEvent>,
 }
 
 impl NodeExecContext {
     fn new() -> Self {
         let mut fbdb = vec![];
         fbdb.resize_with(MAX_ALLOCATED_NODES, FeedbackBuffer::new);
-        Self { feedback_delay_buffers: fbdb, note_buffer: NoteBuffer::new() }
+        let midi_notes = Vec::with_capacity(MAX_MIDI_NOTES_PER_BLOCK);
+        let midi_ccs = Vec::with_capacity(MAX_MIDI_CC_PER_BLOCK);
+        Self { feedback_delay_buffers: fbdb, note_buffer: NoteBuffer::new(), midi_notes, midi_ccs }
     }
 
     fn set_sample_rate(&mut self, srate: f32) {
@@ -354,6 +361,27 @@ impl NodeExecutor {
         }
     }
 
+    #[inline]
+    pub fn feed_midi_events_from<F: FnMut() -> Option<HxTimedEvent>>(&mut self, mut f: F) {
+        self.exec_ctx.midi_notes.clear();
+        self.exec_ctx.midi_ccs.clear();
+
+        while let Some(ev) = f() {
+            if ev.is_cc() {
+                self.exec_ctx.midi_ccs.push(ev);
+            } else {
+                self.exec_ctx.midi_notes.push(ev);
+            }
+
+            if self.exec_ctx.midi_ccs.len() == MAX_MIDI_CC_PER_BLOCK {
+                break;
+            }
+            if self.exec_ctx.midi_notes.len() == MAX_MIDI_NOTES_PER_BLOCK {
+                break;
+            }
+        }
+    }
+
     #[inline]
     pub fn get_note_buffer(&mut self) -> &mut NoteBuffer {
         &mut self.exec_ctx.note_buffer
@@ -548,33 +576,17 @@ impl NodeExecutor {
             let cur_nframes = if nframes >= MAX_BLOCK_SIZE { MAX_BLOCK_SIZE } else { nframes };
             nframes -= cur_nframes;
 
-            let buf = self.get_note_buffer();
-            buf.reset();
-            loop {
+            self.feed_midi_events_from(|| {
                 if ev_win.feed_me() {
                     if events.is_empty() {
-                        break;
+                        return None;
                     }
 
                     ev_win.feed(events.remove(0));
                 }
 
-                if let Some((timing, event)) = ev_win.next_event_in_range(offs + cur_nframes) {
-                    buf.step_to(timing);
-                    match event {
-                        HxMidiEvent::NoteOn { channel, note, vel } => {
-                            buf.note_on(channel, note);
-                            buf.set_velocity(channel, vel);
-                        }
-                        HxMidiEvent::NoteOff { channel, note } => {
-                            buf.note_off(channel, note);
-                        }
-                    }
-                } else {
-                    break;
-                }
-            }
-            self.get_note_buffer().step_to(cur_nframes - 1);
+                ev_win.next_event_in_range(offs, cur_nframes)
+            });
 
             let mut context = crate::Context {
                 nframes: cur_nframes,

src/nodes/note_buffer.rs

@@ -12,6 +12,14 @@ pub struct HxTimedEvent {
 }
 
 impl HxTimedEvent {
+    pub fn is_cc(&self) -> bool {
+        if let HxMidiEvent::CC { .. } = self.kind {
+            true
+        } else {
+            false
+        }
+    }
+
     pub fn note_on(timing: usize, channel: u8, note: u8, vel: f32) -> Self {
         Self { timing, kind: HxMidiEvent::NoteOn { channel, note, vel } }
     }
@@ -21,10 +29,31 @@ impl HxTimedEvent {
     }
 }
 
+pub struct MidiEventPointer<'a> {
+    buf: &'a [HxTimedEvent],
+    idx: usize,
+}
+
+impl<'a> MidiEventPointer<'a> {
+    pub fn new(buf: &'a [HxTimedEvent]) -> Self {
+        Self { buf, idx: 0 }
+    }
+
+    pub fn next_at(&mut self, time: usize) -> Option<HxMidiEvent> {
+        if self.idx < self.buf.len() && self.buf[self.idx].timing <= time {
+            self.idx += 1;
+            Some(self.buf[self.idx - 1].kind)
+        } else {
+            None
+        }
+    }
+}
+
 #[derive(Debug, Clone, Copy)]
 pub enum HxMidiEvent {
     NoteOn { channel: u8, note: u8, vel: f32 },
     NoteOff { channel: u8, note: u8 },
+    CC { channel: u8, cc: u8, value: f32 },
 }
 
 #[derive(Debug, Clone, Copy)]
@@ -128,10 +157,14 @@ impl EventWindowing {
     }
 
     #[inline]
-    pub fn next_event_in_range(&mut self, to_time: usize) -> Option<(usize, HxMidiEvent)> {
+    pub fn next_event_in_range(
+        &mut self,
+        to_time: usize,
+        block_size: usize,
+    ) -> Option<HxTimedEvent> {
         if let Some(event) = self.event.take() {
-            if event.timing < to_time {
-                return Some((event.timing, event.kind));
+            if event.timing < (to_time + block_size) {
+                return Some(HxTimedEvent { timing: event.timing - to_time, kind: event.kind });
             } else {
                 self.event = Some(event);
             }