From 529eff1742ef8e62bc8ccb402fcaa21eba7e2ff7 Mon Sep 17 00:00:00 2001
From: Harald Eilertsen <haraldei@anduin.net>
Date: Wed, 2 Sep 2020 21:30:31 +0200
Subject: LV2: add support for (de)activate in plugin wrapper.

The `activate` callback is called _before_ any audio processing begins.
This is a good place to initialize the plugin to a known good state.

The `deactivate` callback is called _after_ all audio processing is
finished. If any cleanup is needed, this is a good place to do so.
---
 plugins/LV2/include/lv2plugin.h  | 5 +++++
 plugins/LV2/include/lv2wrapper.h | 6 +++++-
 2 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/plugins/LV2/include/lv2plugin.h b/plugins/LV2/include/lv2plugin.h
index 46464a3..77b3996 100644
--- a/plugins/LV2/include/lv2plugin.h
+++ b/plugins/LV2/include/lv2plugin.h
@@ -12,6 +12,8 @@ public:
         : rate(frame_rate)
     {}
 
+    virtual ~LV2Plugin() {}
+
     void connect_port(uint32_t port, void * data)
     {
         if (port < nparams) {
@@ -33,6 +35,9 @@ public:
         return rate;
     }
 
+    virtual void activate() {}
+    virtual void deactivate() {}
+
     const float * params[nparams];
     const float * in[ninputs];
     float * out[noutputs];
diff --git a/plugins/LV2/include/lv2wrapper.h b/plugins/LV2/include/lv2wrapper.h
index 26531cb..e92c690 100644
--- a/plugins/LV2/include/lv2wrapper.h
+++ b/plugins/LV2/include/lv2wrapper.h
@@ -42,6 +42,8 @@ private:
 
     static void activate(LV2_Handle instance)
     {
+        auto accel = static_cast<Plugin *>(instance);
+        accel->activate();
     }
 
     static void run(LV2_Handle instance, uint32_t num_samples)
@@ -50,8 +52,10 @@ private:
         accel->run(num_samples);
     }
 
-    static void deactivate(LV2_Handle)
+    static void deactivate(LV2_Handle instance)
     {
+        auto accel = static_cast<Plugin *>(instance);
+        accel->deactivate();
     }
 
     static void destroy(LV2_Handle instance)
-- 
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