Add automatable click-free bypass/enable feature to a-eq

2 files changed, 27 insertions, 10 deletions

diff --git a/libs/plugins/a-eq.lv2/a-eq.c b/libs/plugins/a-eq.lv2/a-eq.c
index bb9840d601..deac7a641e 100644
--- a/libs/plugins/a-eq.lv2/a-eq.c
+++ b/libs/plugins/a-eq.lv2/a-eq.c
@@ -60,6 +60,7 @@ typedef enum {
 	AEQ_FILTOG3,
 	AEQ_FILTOG4,
 	AEQ_FILTOGH,
+	AEQ_ENABLE,
 	AEQ_INPUT,
 	AEQ_OUTPUT,
 } PortIndex;
@@ -97,6 +98,7 @@ typedef struct {
 	float* bw[BANDS];
 	float* filtog[BANDS];
 	float* master;
+	float* enable;
 
 	float srate;
 	float tau;
@@ -128,7 +130,7 @@ instantiate(const LV2_Descriptor* descriptor,
 {
 	Aeq* aeq = (Aeq*)calloc(1, sizeof(Aeq));
 	aeq->srate = rate;
-	aeq->tau = (1.0 - exp(-2.0 * M_PI * 64 * 25. / aeq->srate)); // 25Hz time constant @ 64fpp
+	aeq->tau = 1.0 - expf (-2.f * M_PI * 64.f * 25.f / aeq->srate); // 25Hz time constant @ 64fpp
 
 #ifdef LV2_EXTENDED
 	for (int i=0; features[i]; ++i) {
@@ -157,6 +159,9 @@ connect_port(LV2_Handle instance,
 	Aeq* aeq = (Aeq*)instance;
 
 	switch ((PortIndex)port) {
+	case AEQ_ENABLE:
+		aeq->enable = (float*)data;
+		break;
 	case AEQ_FREQL:
 		aeq->f0[0] = (float*)data;
 		break;
@@ -355,16 +360,17 @@ run(LV2_Handle instance, uint32_t n_samples)
 	const float tau = aeq->tau;
 	uint32_t offset = 0;
 
+	const float target_gain = *aeq->enable <= 0 ? 0 : *aeq->master; // dB
+
 	while (n_samples > 0) {
 		uint32_t block = n_samples;
 		bool any_changed = false;
 
-		// TODO global en/disable
-		if (!is_eq(aeq->v_master, *aeq->master, 0.1)) {
-			aeq->v_master += tau * (*aeq->master - aeq->v_master);
+		if (!is_eq(aeq->v_master, target_gain, 0.1)) {
+			aeq->v_master += tau * (target_gain - aeq->v_master);
 			any_changed = true;
 		} else {
-			aeq->v_master = *aeq->master;
+			aeq->v_master = target_gain;
 		}
 
 		for (int i = 0; i < BANDS; ++i) {
@@ -377,7 +383,7 @@ run(LV2_Handle instance, uint32_t n_samples)
 				aeq->v_f0[i] = *aeq->f0[i];
 			}
 
-			if (*aeq->filtog[i] <= 0) {
+			if (*aeq->filtog[i] <= 0 || *aeq->enable <= 0) {
 				if (!is_eq(aeq->v_g[i], 0.f, 0.05)) {
 					aeq->v_g[i] += tau * (0.0 - aeq->v_g[i]);
 					changed = true;
@@ -420,7 +426,7 @@ run(LV2_Handle instance, uint32_t n_samples)
 			for (uint32_t j = 0; j < BANDS; j++) {
 				out = run_linear_svf(&aeq->v_filter[j], out);
 			}
-			output[i + offset] = out * from_dB(*(aeq->master));
+			output[i + offset] = out * from_dB(aeq->v_master);
 		}
 		n_samples -= block;
 		offset += block;
diff --git a/libs/plugins/a-eq.lv2/a-eq.ttl.in b/libs/plugins/a-eq.lv2/a-eq.ttl.in
index eafd2fa952..9cd8851ec0 100644
--- a/libs/plugins/a-eq.lv2/a-eq.ttl.in
+++ b/libs/plugins/a-eq.lv2/a-eq.ttl.in
@@ -264,18 +264,29 @@ unit:hz0
         lv2:minimum 0.000000 ;
         lv2:maximum 1.000000 ;
         lv2:portProperty lv2:toggled ;
-    ] ;
+    ],
+    [
+        a lv2:InputPort, lv2:ControlPort ;
+        lv2:index 23 ;
+        lv2:name "Enable" ;
+        lv2:symbol "enable" ;
+        lv2:default 1 ;
+        lv2:minimum 0 ;
+        lv2:maximum 1 ;
+        lv2:portProperty lv2:integer, lv2:toggled ;
+        lv2:designation <http://ardour.org/lv2/processing#enable>;
+    ];
 
     lv2:port [
         a lv2:InputPort, lv2:AudioPort ;
-        lv2:index 23 ;
+        lv2:index 24 ;
         lv2:symbol "in_1" ;
         lv2:name "Audio Input 1" ;
     ] ;
 
     lv2:port [
         a lv2:OutputPort, lv2:AudioPort ;
-        lv2:index 24 ;
+        lv2:index 25 ;
         lv2:symbol "out_1" ;
         lv2:name "Audio Output 1" ;
     ] ;