Add a-Delay plugin

6 files changed, 734 insertions, 0 deletions

diff --git a/libs/plugins/a-delay.lv2/a-delay.c b/libs/plugins/a-delay.lv2/a-delay.c
new file mode 100644
index 0000000000..40fd05c51f
--- /dev/null
+++ b/libs/plugins/a-delay.lv2/a-delay.c
@@ -0,0 +1,470 @@
+/* a-delay
+ * Copyright (C) 2016 Damien Zammit <damien@zamaudio.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <math.h>
+#include <stdlib.h>
+#include <stdio.h>
+
+#include "lv2/lv2plug.in/ns/lv2core/lv2.h"
+#include "lv2/lv2plug.in/ns/ext/atom/atom.h"
+#include "lv2/lv2plug.in/ns/ext/time/time.h"
+#include "lv2/lv2plug.in/ns/ext/atom/forge.h"
+#include "lv2/lv2plug.in/ns/ext/urid/urid.h"
+
+#define ADELAY_URI "urn:ardour:a-delay"
+
+// 8 seconds of delay at 96kHz
+#define MAX_DELAY 768000
+
+#ifndef M_PI
+# define M_PI 3.1415926
+#endif
+
+typedef enum {
+	ADELAY_INPUT = 0,
+	ADELAY_OUTPUT,
+
+	ADELAY_BPM,
+
+	ADELAY_INV,
+	ADELAY_SYNC,
+	ADELAY_TIME,
+	ADELAY_DIVISOR,
+	ADELAY_WETDRY,
+	ADELAY_LPF,
+	ADELAY_GAIN,
+	
+	ADELAY_DELAYTIME,
+} PortIndex;
+
+
+typedef struct {
+	LV2_URID atom_Blank;
+	LV2_URID atom_Object;
+	LV2_URID atom_Sequence;
+	LV2_URID atom_Long;
+	LV2_URID atom_Int;
+	LV2_URID atom_Float;
+	LV2_URID atom_Double;
+	LV2_URID time_beatUnit;
+	LV2_URID time_beatsPerMinute;
+	LV2_URID time_Position;
+} DelayURIs;
+
+typedef struct {
+	float* input;
+	float* output;
+
+	const LV2_Atom_Sequence* atombpm;
+
+	float* inv;
+	float* sync;
+	float* time;
+	float* divisor;
+	float* wetdry;
+	float* lpf;
+	float* gain;
+	
+	float* delaytime;
+
+	float srate;
+	float bpm;
+	float beatunit;
+	int beatuniti;
+	int bpmvalid;
+
+	uint32_t posz;
+	float tap[2];
+	float z[MAX_DELAY];
+	int active;
+	int next;
+	float fbstate;
+	float lpfold;
+	float divisorold;
+	float gainold;
+	float invertold;
+	float timeold;
+	float delaytimeold;
+	float syncold;
+	float wetdryold;
+	float delaysamplesold;
+
+	float A0, A1, A2, A3, A4, A5;
+	float B0, B1, B2, B3, B4, B5;
+	float state[4];
+
+	DelayURIs uris;
+	LV2_Atom_Forge forge;
+	LV2_URID_Map* map;
+} ADelay;
+
+static inline void
+map_uris(LV2_URID_Map* map, DelayURIs* uris)
+{
+	uris->atom_Blank          = map->map(map->handle, LV2_ATOM__Blank);
+	uris->atom_Object         = map->map(map->handle, LV2_ATOM__Object);
+	uris->atom_Sequence       = map->map(map->handle, LV2_ATOM__Sequence);
+	uris->atom_Long           = map->map(map->handle, LV2_ATOM__Long);
+	uris->atom_Int            = map->map(map->handle, LV2_ATOM__Int);
+	uris->atom_Float          = map->map(map->handle, LV2_ATOM__Float);
+	uris->atom_Double         = map->map(map->handle, LV2_ATOM__Double);
+	uris->time_beatUnit       = map->map(map->handle, LV2_TIME__beatUnit);
+	uris->time_beatsPerMinute = map->map(map->handle, LV2_TIME__beatsPerMinute);
+	uris->time_Position       = map->map(map->handle, LV2_TIME__Position);
+}
+
+static LV2_Handle
+instantiate(const LV2_Descriptor* descriptor,
+            double rate,
+            const char* bundle_path,
+            const LV2_Feature* const* features)
+{
+	int i;
+	ADelay* adelay = (ADelay*)calloc(1, sizeof(ADelay));
+	if (!adelay) return NULL;
+
+	for (i = 0; features[i]; ++i) {
+		if (!strcmp(features[i]->URI, LV2_URID__map)) {
+			adelay->map = (LV2_URID_Map*)features[i]->data;
+		}
+	}
+
+	if (!adelay->map) {
+		fprintf(stderr, "a-delay.lv2 error: Host does not support urid:map\n");
+		free(adelay);
+		return NULL;
+	}
+
+	map_uris(adelay->map, &adelay->uris);
+	lv2_atom_forge_init(&adelay->forge, adelay->map);
+
+	adelay->srate = rate;
+	adelay->bpmvalid = 0;
+
+	return (LV2_Handle)adelay;
+}
+
+static void
+connect_port(LV2_Handle instance,
+             uint32_t port,
+             void* data)
+{
+	ADelay* adelay = (ADelay*)instance;
+
+	switch ((PortIndex)port) {
+	case ADELAY_INPUT:
+		adelay->input = (float*)data;
+		break;
+	case ADELAY_OUTPUT:
+		adelay->output = (float*)data;
+		break;
+	case ADELAY_BPM:
+		adelay->atombpm = (const LV2_Atom_Sequence*)data;
+		break;
+	case ADELAY_INV:
+		adelay->inv = (float*)data;
+		break;
+	case ADELAY_SYNC:
+		adelay->sync = (float*)data;
+		break;
+	case ADELAY_TIME:
+		adelay->time = (float*)data;
+		break;
+	case ADELAY_DIVISOR:
+		adelay->divisor = (float*)data;
+		break;
+	case ADELAY_WETDRY:
+		adelay->wetdry = (float*)data;
+		break;
+	case ADELAY_LPF:
+		adelay->lpf = (float*)data;
+		break;
+	case ADELAY_GAIN:
+		adelay->gain = (float*)data;
+		break;
+	case ADELAY_DELAYTIME:
+		adelay->delaytime = (float*)data;
+		break;
+	}
+}
+
+static inline float
+sanitize_denormal(float value) {
+	if (!isnormal(value)) {
+		value = 0.f;
+	}
+	return value;
+}
+
+static inline float
+from_dB(float gdb) {
+	return (exp(gdb/20.f*log(10.f)));
+}
+
+static inline float
+to_dB(float g) {
+	return (20.f*log10(g));
+}
+
+static void clearfilter(LV2_Handle instance)
+{
+	ADelay* adelay = (ADelay*)instance;
+
+	adelay->state[0] = adelay->state[1] =
+		adelay->state[2] = adelay->state[3] = 0.f;
+}
+
+static void
+activate(LV2_Handle instance)
+{
+	ADelay* adelay = (ADelay*)instance;
+
+	int i;
+	for (i = 0; i < MAX_DELAY; i++) {
+		adelay->z[i] = 0.f;
+	}
+	adelay->posz = 0;
+	adelay->tap[0] = 0;
+	adelay->tap[1] = 0;
+	adelay->active = 0;
+	adelay->next = 1;
+	adelay->fbstate = 0.f;
+
+	clearfilter(adelay);
+
+	adelay->lpfold = 0.f;
+	adelay->divisorold = 0.f;
+	adelay->gainold = 0.f;
+	adelay->invertold = 0.f;
+	adelay->timeold = 0.f;
+	adelay->delaytimeold = 0.f;
+	adelay->syncold = 0.f;
+	adelay->wetdryold = 0.f;
+	adelay->delaysamplesold = 1.f;
+}
+
+static void lpfRbj(LV2_Handle instance, float fc, float srate)
+{
+	ADelay* adelay = (ADelay*)instance;
+
+	float w0, alpha, cw, sw, q;
+	q = 0.707;
+	w0 = (2. * M_PI * fc / srate);
+	sw = sin(w0);
+	cw = cos(w0);
+	alpha = sw / (2. * q);
+
+	adelay->A0 = 1. + alpha;
+	adelay->A1 = -2. * cw;
+	adelay->A2 = 1. - alpha;
+	adelay->B0 = (1. - cw) / 2.;
+	adelay->B1 = (1. - cw);
+	adelay->B2 = adelay->B0;
+
+	adelay->A3 = 1. + alpha;
+	adelay->A4 = -2. * cw;
+	adelay->A5 = 1. - alpha;
+	adelay->B3 = (1. - cw) / 2.;
+	adelay->B4 = (1. - cw);
+	adelay->B5 = adelay->B3;
+}
+
+static float runfilter(LV2_Handle instance, float in)
+{
+	ADelay* a = (ADelay*)instance;
+
+	float out;
+	in = sanitize_denormal(in);
+
+	out = a->B0/a->A0*in + a->B1/a->A0*a->state[0] + a->B2/a->A0*a->state[1]
+			-a->A1/a->A0*a->state[2] - a->A2/a->A0*a->state[3] + 1e-20;
+
+	a->state[1] = a->state[0];
+	a->state[0] = in;
+	a->state[3] = a->state[2];
+	a->state[2] = out;
+	return out;
+}
+
+static void
+update_bpm(ADelay* self, const LV2_Atom_Object* obj)
+{
+	const DelayURIs* uris = &self->uris;
+
+	// Received new transport bpm/beatunit
+	LV2_Atom *beatunit = NULL, *bpm = NULL;
+	lv2_atom_object_get(obj,
+	                    uris->time_beatUnit, &beatunit,
+	                    uris->time_beatsPerMinute, &bpm,
+	                    NULL);
+	// Tempo changed, update BPM
+	if (bpm && bpm->type == uris->atom_Float) {
+		self->bpm = ((LV2_Atom_Float*)bpm)->body;
+	}
+	// Time signature changed, update beatunit
+	if (beatunit && beatunit->type == uris->atom_Int) {
+		int b = ((LV2_Atom_Int*)beatunit)->body;
+		self->beatunit = (float)b;
+	}
+	if (beatunit && beatunit->type == uris->atom_Double) {
+		double b = ((LV2_Atom_Double*)beatunit)->body;
+		self->beatunit = (float)b;
+	}
+	if (beatunit && beatunit->type == uris->atom_Float) {
+		self->beatunit = ((LV2_Atom_Float*)beatunit)->body;
+	}
+	if (beatunit && beatunit->type == uris->atom_Long) {
+		long int b = ((LV2_Atom_Long*)beatunit)->body;
+		self->beatunit = (float)b;
+	}
+	self->bpmvalid = 1;
+}
+
+static void
+run(LV2_Handle instance, uint32_t n_samples)
+{
+	ADelay* adelay = (ADelay*)instance;
+
+	const float* const input = adelay->input;
+	float* const output = adelay->output;
+
+	float srate = adelay->srate;
+
+	uint32_t i;
+	float in;
+	int delaysamples;
+	unsigned int tmp;
+	float inv;
+	float xfade;
+	int recalc;
+	if (*(adelay->inv) < 0.5) {
+		inv = -1.f;
+	} else {
+		inv = 1.f;
+	}
+	
+	recalc = 0;
+	if (*(adelay->inv) != adelay->invertold) {
+		recalc = 1;
+	}
+	if (*(adelay->sync) != adelay->syncold) {
+		recalc = 1;
+	}
+	if (*(adelay->time) != adelay->timeold) {
+		recalc = 1;
+	}
+	if (*(adelay->divisor) != adelay->divisorold) {
+		recalc = 1;
+	}
+	if (*(adelay->lpf) != adelay->lpfold) {
+		lpfRbj(adelay, *(adelay->lpf), srate);
+	}
+	if (*(adelay->gain) != adelay->gainold) {
+		recalc = 1;
+	}
+	
+	if (recalc) {
+		if (*(adelay->sync) > 0.5f && adelay->bpmvalid) {
+			*(adelay->delaytime) = adelay->beatunit * 1000.f * 60.f / (adelay->bpm * *(adelay->divisor));
+		} else {
+			*(adelay->delaytime) = *(adelay->time);
+		}
+		delaysamples = (int)(*(adelay->delaytime) * srate) / 1000;
+		adelay->tap[adelay->next] = delaysamples;
+	}
+
+	xfade = 0.f;
+	for (i = 0; i < n_samples; i++) {
+		in = input[i];
+		adelay->z[adelay->posz] = in; // + feedb / 100. * fbstate;
+		adelay->fbstate = 0.f;
+		int p = adelay->posz - adelay->tap[adelay->active]; // active line
+		if (p<0) p += MAX_DELAY;
+		adelay->fbstate += adelay->z[p];
+		
+		if (recalc) {
+			xfade += 1.0f / (float)n_samples;
+			adelay->fbstate *= (1.-xfade);
+			int p = adelay->posz - adelay->tap[adelay->next]; // next line
+			if (p<0) p += MAX_DELAY;
+			adelay->fbstate += adelay->z[p] * xfade;
+		}
+		output[i] = from_dB(*(adelay->gain)) * ((100.-*(adelay->wetdry)) / 100. * in + *(adelay->wetdry) / 100. * -inv * runfilter(adelay, adelay->fbstate));
+		if (++(adelay->posz) >= MAX_DELAY) {
+			adelay->posz = 0;
+		}
+	}
+	adelay->lpfold = *(adelay->lpf);
+	adelay->divisorold = *(adelay->divisor);
+	adelay->gainold = *(adelay->gain);
+	adelay->invertold = *(adelay->inv);
+	adelay->timeold = *(adelay->time);
+	adelay->syncold = *(adelay->sync);
+	adelay->wetdryold = *(adelay->wetdry);
+	adelay->delaytimeold = *(adelay->delaytime);
+	adelay->delaysamplesold = delaysamples;
+	if (recalc) {
+		tmp = adelay->active;
+		adelay->active = adelay->next;
+		adelay->next = tmp;
+	}
+	
+	if (adelay->atombpm) {
+		LV2_Atom_Event* ev = lv2_atom_sequence_begin(&(adelay->atombpm)->body);
+		while(!lv2_atom_sequence_is_end(&(adelay->atombpm)->body, (adelay->atombpm)->atom.size, ev)) {
+			if (ev->body.type == adelay->uris.atom_Blank || ev->body.type == adelay->uris.atom_Object) {
+				const LV2_Atom_Object* obj = (LV2_Atom_Object*)&ev->body;
+				if (obj->body.otype == adelay->uris.time_Position) {
+					update_bpm(adelay, obj);
+				}
+			}
+			ev = lv2_atom_sequence_next(ev);
+		}
+	}
+}
+
+static void
+cleanup(LV2_Handle instance)
+{
+	free(instance);
+}
+
+static const void*
+extension_data(const char* uri)
+{
+	return NULL;
+}
+
+static const LV2_Descriptor descriptor = {
+	ADELAY_URI,
+	instantiate,
+	connect_port,
+	activate,
+	run,
+	NULL,
+	cleanup,
+	extension_data
+};
+
+LV2_SYMBOL_EXPORT
+const LV2_Descriptor*
+lv2_descriptor(uint32_t index)
+{
+	switch (index) {
+	case 0:
+		return &descriptor;
+	default:
+		return NULL;
+	}
+}
diff --git a/libs/plugins/a-delay.lv2/a-delay.ttl.in b/libs/plugins/a-delay.lv2/a-delay.ttl.in
new file mode 100644
index 0000000000..627f3e4ad9
--- /dev/null
+++ b/libs/plugins/a-delay.lv2/a-delay.ttl.in
@@ -0,0 +1,153 @@
+@prefix atom: <http://lv2plug.in/ns/ext/atom#> .
+@prefix doap: <http://usefulinc.com/ns/doap#> .
+@prefix foaf: <http://xmlns.com/foaf/0.1/> .
+@prefix lv2:  <http://lv2plug.in/ns/lv2core#> .
+@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
+@prefix rsz:  <http://lv2plug.in/ns/ext/resize-port#> .
+@prefix unit: <http://lv2plug.in/ns/extensions/units#> .
+@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
+
+<http://ardour.org/credits.html>
+	a foaf:Person ;
+	foaf:name "Ardour Team" ;
+	foaf:homepage <http://ardour.org/> .
+
+<urn:ardour:a-delay>
+    a lv2:Plugin, doap:Project, lv2:DelayPlugin ;
+
+    lv2:optionalFeature <http://lv2plug.in/ns/lv2core#hardRTCapable>;
+
+    lv2:requiredFeature <http://lv2plug.in/ns/ext/options#options> ,
+                        <http://lv2plug.in/ns/ext/urid#map> ;
+
+    lv2:port [
+        a lv2:InputPort, lv2:AudioPort ;
+        lv2:index 0 ;
+        lv2:symbol "in_1" ;
+        lv2:name "Audio Input 1" ;
+    ] ;
+
+    lv2:port [
+        a lv2:OutputPort, lv2:AudioPort ;
+        lv2:index 1 ;
+        lv2:symbol "out_1" ;
+        lv2:name "Audio Output 1" ;
+    ] ;
+
+    lv2:port [
+        a lv2:InputPort, atom:AtomPort ;
+        lv2:index 2 ;
+        lv2:name "BPM Input" ;
+        lv2:symbol "bpm_in" ;
+        rsz:minimumSize 2048 ;
+        atom:bufferType atom:Sequence ;
+        atom:supports <http://lv2plug.in/ns/ext/time#Position> ;
+    ] ;
+
+    lv2:port [
+        a lv2:InputPort, lv2:ControlPort ;
+        lv2:index 3 ;
+        lv2:name "Invert" ;
+        lv2:symbol "inv" ;
+        lv2:default 0.000000 ;
+        lv2:minimum 0.000000 ;
+        lv2:maximum 1.000000 ;
+        lv2:portProperty lv2:toggled ;
+    ] ,
+    [
+        a lv2:InputPort, lv2:ControlPort ;
+        lv2:index 4 ;
+        lv2:name "Sync BPM" ;
+        lv2:symbol "sync" ;
+        lv2:default 0.000000 ;
+        lv2:minimum 0.000000 ;
+        lv2:maximum 1.000000 ;
+        lv2:portProperty lv2:toggled ;
+    ] ,
+    [
+        a lv2:InputPort, lv2:ControlPort ;
+        lv2:index 5 ;
+        lv2:name "Time" ;
+        lv2:symbol "time" ;
+        lv2:default 160.000000 ;
+        lv2:minimum 1.000000 ;
+        lv2:maximum 8000.000000 ;
+        unit:unit unit:ms ;
+        lv2:portProperty <http://lv2plug.in/ns/ext/port-props#logarithmic> ;
+    ] ,
+    [
+        a lv2:InputPort, lv2:ControlPort ;
+        lv2:index 6 ;
+        lv2:name "Divisor" ;
+        lv2:symbol "div" ;
+        lv2:default 4 ;
+        lv2:minimum 1 ;
+        lv2:maximum 48 ;
+        lv2:portProperty <http://lv2plug.in/ns/ext/port-props#hasStrictBounds> ;
+        lv2:portProperty lv2:enumeration ;
+        lv2:portProperty lv2:integer ;
+        lv2:scalePoint [ rdfs:label "a - Whole note"; rdf:value 1 ] ;
+        lv2:scalePoint [ rdfs:label "b - Half note"; rdf:value 2 ] ;
+        lv2:scalePoint [ rdfs:label "c - ♩"; rdf:value 4 ] ;
+        lv2:scalePoint [ rdfs:label "d - ♪"; rdf:value 8 ] ;
+        lv2:scalePoint [ rdfs:label "e - ♬"; rdf:value 16 ] ;
+        lv2:scalePoint [ rdfs:label "f - 32nd note"; rdf:value 32 ] ;
+        lv2:scalePoint [ rdfs:label "g - ♩³ (Triplet)"; rdf:value 6 ] ;
+        lv2:scalePoint [ rdfs:label "h - ♪³ (Triplet)"; rdf:value 12 ] ;
+        lv2:scalePoint [ rdfs:label "i - ♬³ (Triplet)"; rdf:value 24 ] ;
+        lv2:scalePoint [ rdfs:label "j - 32nd note (Triplet)"; rdf:value 48 ] ;
+    ] ,
+    [
+        a lv2:InputPort, lv2:ControlPort ;
+        lv2:index 7 ;
+        lv2:name "Dry/Wet" ;
+        lv2:symbol "drywet" ;
+        lv2:default 50.000000 ;
+        lv2:minimum 0.000000 ;
+        lv2:maximum 100.000000 ;
+        unit:unit unit:pc ;
+    ] ,
+    [
+        a lv2:InputPort, lv2:ControlPort ;
+        lv2:index 8 ;
+        lv2:name "LPF" ;
+        lv2:symbol "lpf" ;
+        lv2:default 6000.000000 ;
+        lv2:minimum 20.000000 ;
+        lv2:maximum 20000.000000 ;
+        unit:unit unit:hz ;
+        lv2:portProperty <http://lv2plug.in/ns/ext/port-props#logarithmic> ;
+    ] ,
+    [
+        a lv2:InputPort, lv2:ControlPort ;
+        lv2:index 9 ;
+        lv2:name "Output Gain" ;
+        lv2:symbol "gain" ;
+        lv2:default 0.000000 ;
+        lv2:minimum -60.000000 ;
+        lv2:maximum 0.000000 ;
+        unit:unit unit:db ;
+    ] ,
+    [
+        a lv2:OutputPort, lv2:ControlPort ;
+        lv2:index 10 ;
+        lv2:name "Delaytime" ;
+        lv2:symbol "delaytime" ;
+        lv2:default 0.000000 ;
+        lv2:minimum 1.000000 ;
+        lv2:maximum 8000.000000 ;
+        unit:unit unit:ms ;
+    ] ;
+
+    rdfs:comment """
+A simple delay plugin
+""" ;
+
+    doap:name "a-Delay" ;
+    doap:license "GPL v2+" ;
+    doap:maintainer <http://ardour.org/credits.html>
+
+#   ui:ui <urn:ardour:a-delay#ui>;
+
+    lv2:microVersion 1 ;
+    lv2:minorVersion 1 .
diff --git a/libs/plugins/a-delay.lv2/manifest.ttl.in b/libs/plugins/a-delay.lv2/manifest.ttl.in
new file mode 100644
index 0000000000..84ca864a8b
--- /dev/null
+++ b/libs/plugins/a-delay.lv2/manifest.ttl.in
@@ -0,0 +1,20 @@
+@prefix lv2:  <http://lv2plug.in/ns/lv2core#> .
+@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
+@prefix pset: <http://lv2plug.in/ns/ext/presets#> .
+@prefix ui:   <http://lv2plug.in/ns/extensions/ui#> .
+
+<urn:ardour:a-delay>
+    a lv2:Plugin ;
+    lv2:binary <a-delay@LIB_EXT@> ;
+    rdfs:seeAlso <a-delay.ttl> .
+
+#<urn:ardour:a-delay#ui>
+#    a ui:GtkUI ;
+#    ui:binary <a-delay-ui@LIB_EXT@> ;
+#    rdfs:seeAlso <a-delay.ttl> .
+
+<urn:ardour:a-delay#preset001>
+    a pset:Preset ;
+    lv2:appliesTo <urn:ardour:a-delay> ;
+    rdfs:label "Zero" ;
+    rdfs:seeAlso <presets.ttl> .
diff --git a/libs/plugins/a-delay.lv2/presets.ttl.in b/libs/plugins/a-delay.lv2/presets.ttl.in
new file mode 100644
index 0000000000..1bde45cdfc
--- /dev/null
+++ b/libs/plugins/a-delay.lv2/presets.ttl.in
@@ -0,0 +1,38 @@
+@prefix lv2:   <http://lv2plug.in/ns/lv2core#> .
+@prefix pset:  <http://lv2plug.in/ns/ext/presets#> .
+
+<urn:ardour:a-delay#preset001>
+    lv2:port [
+        lv2:symbol "inv" ;
+        pset:value 0.000000 ;
+    ] ,
+    [
+        lv2:symbol "sync" ;
+        pset:value 0.000000 ;
+    ] ,
+    [
+        lv2:symbol "time" ;
+        pset:value 160.000000 ;
+    ] ,
+    [
+        lv2:symbol "div" ;
+        pset:value 3 ;
+    ] ,
+    [
+        lv2:symbol "drywet" ;
+        pset:value 50.000000 ;
+    ] ,
+    [
+        lv2:symbol "lpf" ;
+        pset:value 6000.000000 ;
+    ] ,
+    [
+        lv2:symbol "gain" ;
+        pset:value 0.000000 ;
+    ] ,
+    [
+        lv2:symbol "delaytime" ;
+        pset:value 0.000000 ;
+    ] .
+
+
diff --git a/libs/plugins/a-delay.lv2/wscript b/libs/plugins/a-delay.lv2/wscript
new file mode 100644
index 0000000000..666ef0d5ab
--- /dev/null
+++ b/libs/plugins/a-delay.lv2/wscript
@@ -0,0 +1,52 @@
+#!/usr/bin/env python
+import os
+import re
+import shutil
+import waflib.extras.autowaf as autowaf
+import waflib.Options as Options, waflib.Utils as Utils
+
+# Mandatory variables
+top = '.'
+out = 'build'
+
+def options(opt):
+    autowaf.set_options(opt)
+
+def configure(conf):
+    conf.load('compiler_c')
+    autowaf.configure(conf)
+    if Options.options.lv2:
+        autowaf.check_pkg(conf, 'lv2', atleast_version='1.0.0',
+                uselib_store='LV2_1_0_0')
+        autowaf.check_pkg(conf, 'cairo', uselib_store='CAIRO', atleast_version='1.12.0') 
+
+def build(bld):
+    bundle = 'a-delay.lv2'
+    module_pat = re.sub('^lib', '', bld.env.cshlib_PATTERN)
+    module_ext = module_pat[module_pat.rfind('.'):]
+
+    if bld.is_defined ('HAVE_LV2'):
+        # Build RDF files
+        for i in ['manifest.ttl', 'a-delay.ttl', 'presets.ttl']:
+            bld(features     = 'subst',
+                source       = i + '.in',
+                target       = '../../LV2/%s/%s' % (bundle, i),
+                install_path = '${LV2DIR}/%s' % bundle,
+                chmod        = Utils.O644,
+                LIB_EXT      = module_ext)
+
+        # Build plugin library
+        obj = bld(features     = 'c cshlib',
+                  source       = 'a-delay.c',
+                  name         = 'a-delay',
+                  cflags       = [ '-fPIC',  bld.env['compiler_flags_dict']['c99'] ],
+                  includes     = [ '../../ardour' ],
+                  target       = '../../LV2/%s/a-delay' % bundle,
+                  install_path = '${LV2DIR}/%s' % bundle,
+                  uselib       = 'CAIRO',
+                  use          = 'LV2_1_0_0'
+                  )
+        obj.env.cshlib_PATTERN = module_pat
+        obj.env.cxxshlib_PATTERN = module_pat
+
+# vi:set ts=4 sw=4 et:
diff --git a/wscript b/wscript
index edaae503ba..0fc9358fb0 100644
--- a/wscript
+++ b/wscript
@@ -220,6 +220,7 @@ children = [
         'libs/canvas',
         'libs/plugins/reasonablesynth.lv2',
         'libs/plugins/a-comp.lv2',
+        'libs/plugins/a-delay.lv2',
         'gtk2_ardour',
         'export',
         'midi_maps',