From d703079f1095a2cf767ef51ca325f8e85121a115 Mon Sep 17 00:00:00 2001
From: Robin Gareus <robin@gareus.org>
Date: Fri, 21 May 2021 18:30:35 +0200
Subject: [PATCH] ace-fluidsynth: add bypass (ignore notes, but retain reverb)

---
 libs/plugins/a-fluidsynth.lv2/a-fluidsynth.cc     | 10 +++++++++-
 libs/plugins/a-fluidsynth.lv2/a-fluidsynth.ttl.in | 11 +++++++++++
 2 files changed, 20 insertions(+), 1 deletion(-)

diff --git a/libs/plugins/a-fluidsynth.lv2/a-fluidsynth.cc b/libs/plugins/a-fluidsynth.lv2/a-fluidsynth.cc
index 0ab1e10c45..04b3c3d849 100644
--- a/libs/plugins/a-fluidsynth.lv2/a-fluidsynth.cc
+++ b/libs/plugins/a-fluidsynth.lv2/a-fluidsynth.cc
@@ -72,6 +72,7 @@ enum {
 	FS_CHR_DEPTH,
 	FS_CHR_LEVEL,
 	FS_CHR_TYPE,
+	FS_PORT_ENABLE,
 	FS_PORT_LAST
 };
 
@@ -524,6 +525,13 @@ run (LV2_Handle instance, uint32_t n_samples)
 	lv2_atom_forge_set_buffer (&self->forge, (uint8_t*)self->notify, capacity);
 	lv2_atom_forge_sequence_head (&self->forge, &self->frame, 0);
 
+	const bool enabled = *self->p_ports[FS_PORT_ENABLE] > 0;
+	if (self->v_ports[FS_PORT_ENABLE] != *self->p_ports[FS_PORT_ENABLE]) {
+		if (self->initialized && !self->reinit_in_progress) {
+			fluid_synth_all_notes_off (self->synth, -1);
+		}
+	}
+
 	if (!self->initialized || self->reinit_in_progress) {
 		memset (self->p_ports[FS_PORT_OUT_L], 0, n_samples * sizeof (float));
 		memset (self->p_ports[FS_PORT_OUT_R], 0, n_samples * sizeof (float));
@@ -602,7 +610,7 @@ run (LV2_Handle instance, uint32_t n_samples)
 				}
 			}
 		} else if (ev->body.type == self->midi_MidiEvent) {
-			if (ev->time.frames >= n_samples || self->reinit_in_progress) {
+			if (ev->time.frames >= n_samples || self->reinit_in_progress || !enabled) {
 				continue;
 			}
 			if (ev->body.size > 3) {
diff --git a/libs/plugins/a-fluidsynth.lv2/a-fluidsynth.ttl.in b/libs/plugins/a-fluidsynth.lv2/a-fluidsynth.ttl.in
index 98b6ea9327..75812e81d8 100644
--- a/libs/plugins/a-fluidsynth.lv2/a-fluidsynth.ttl.in
+++ b/libs/plugins/a-fluidsynth.lv2/a-fluidsynth.ttl.in
@@ -172,4 +172,15 @@
         lv2:portProperty lv2:integer, lv2:enumeration;
         lv2:scalePoint [ rdfs:label  "Sine";  rdf:value 0.0 ; ] ;
         lv2:scalePoint [ rdfs:label  "Triangle";  rdf:value 1.0 ; ] ;
+    ] ,
+    [
+        a lv2:InputPort, lv2:ControlPort ;
+        lv2:index 16 ;
+        lv2:name "Enable" ;
+        lv2:symbol "enable" ;
+        lv2:default 1 ;
+        lv2:minimum 0 ;
+        lv2:maximum 1 ;
+        lv2:portProperty lv2:integer, lv2:toggled ;
+        lv2:designation lv2:enabled;
     ] .