From 10d483417fa70bb4c357d598f3bdfcf4f0b75f21 Mon Sep 17 00:00:00 2001
From: Bent Bisballe Nyeng <deva@aasimon.org>
Date: Mon, 1 Apr 2019 20:22:14 +0200
Subject: Add midi aftertouch choke for plugins.

---
 plugin/drumgizmo_plugin.cc | 32 +++++++++++++++++-----
 plugin/plugingizmo         |  2 +-
 src/event.h                |  1 +
 src/inputprocessor.cc      | 66 ++++++++++++++++++++++++++++++++++++++++++++++
 src/inputprocessor.h       |  1 +
 5 files changed, 94 insertions(+), 8 deletions(-)

diff --git a/plugin/drumgizmo_plugin.cc b/plugin/drumgizmo_plugin.cc
index 3328f6b..67436af 100644
--- a/plugin/drumgizmo_plugin.cc
+++ b/plugin/drumgizmo_plugin.cc
@@ -372,15 +372,33 @@ void DrumGizmoPlugin::Input::run(size_t pos, size_t len, std::vector<event_t>& e
 
 	for(auto& event : *plugin.input_events)
 	{
-		if(event.type !=  MidiEventType::NoteOn)
+		switch(event.type)
 		{
-			continue;
-		}
+		case MidiEventType::NoteOn:
+			{
+				int i = mmap.lookup(event.key);
+				if(event.velocity != 0 && (i != -1))
+				{
+					events.push_back({EventType::OnSet, (size_t)i,
+					                  (size_t)event.getTime(), event.velocity / 127.0f});
+				}
+			}
+			break;
 
-		int i = mmap.lookup(event.key);
-		if(event.velocity && (i != -1))
-		{
-			events.push_back({EventType::OnSet, (size_t)i, (size_t)event.getTime(), event.velocity / 127.0f});
+		case MidiEventType::Aftertouch:
+			{
+				int i = mmap.lookup(event.key);
+				if(event.velocity == 0 && i != -1)
+				{
+					events.push_back({EventType::Choke, (size_t)i,
+					                  (size_t)event.getTime(), .0f});
+				}
+			}
+			break;
+
+		case MidiEventType::NoteOff:
+		case MidiEventType::Unknown:
+			break;
 		}
 	}
 }
diff --git a/plugin/plugingizmo b/plugin/plugingizmo
index cf2311b..34bfc50 160000
--- a/plugin/plugingizmo
+++ b/plugin/plugingizmo
@@ -1 +1 @@
-Subproject commit cf2311b09f788447d1c079274405477992eee9e8
+Subproject commit 34bfc5046bd297311a38dace8914c51905ca9d2e
diff --git a/src/event.h b/src/event.h
index 2b10e44..737fb18 100644
--- a/src/event.h
+++ b/src/event.h
@@ -32,6 +32,7 @@
 enum class EventType
 {
 	OnSet,
+	Choke,
 	Stop,
 };
 
diff --git a/src/inputprocessor.cc b/src/inputprocessor.cc
index 1a3246c..3e779f6 100644
--- a/src/inputprocessor.cc
+++ b/src/inputprocessor.cc
@@ -65,6 +65,14 @@ bool InputProcessor::process(std::vector<event_t>& events,
 			}
 		}
 
+		if(event.type == EventType::Choke)
+		{
+			if(!processChoke(event, pos, resample_ratio))
+			{
+				continue;
+			}
+		}
+
 		if(!processStop(event))
 		{
 			return false;
@@ -205,6 +213,64 @@ bool InputProcessor::processOnset(event_t& event,
 	return true;
 }
 
+bool InputProcessor::processChoke(event_t& event,
+                                  std::size_t pos,
+                                  double resample_ratio)
+{
+	if(!kit.isValid())
+	{
+		return false;
+	}
+
+	std::size_t instrument_id = event.instrument;
+	Instrument* instr = nullptr;
+
+	if(instrument_id < kit.instruments.size())
+	{
+		instr = kit.instruments[instrument_id].get();
+	}
+
+	if(instr == nullptr || !instr->isValid())
+	{
+		ERR(inputprocessor, "Missing Instrument %d.\n", (int)instrument_id);
+		return false;
+	}
+
+	for(auto& filter : filters)
+	{
+		// This line might change the 'event' variable
+		bool keep = filter->filter(event, event.offset + pos);
+
+		if(!keep)
+		{
+			return false; // Skip event completely
+		}
+	}
+
+	// Add event to ramp down all existing events with the same groupname.
+	for(const auto& ch : kit.channels)
+	{
+		for(auto active_event : activeevents[ch.num])
+		{
+			if(active_event->getType() == Event::sample)
+			{
+				auto& event_sample = *static_cast<EventSample*>(active_event);
+				if(event_sample.instrument_id != instrument_id &&
+				   event_sample.rampdown_count == -1) // Only if not already ramping.
+				{
+					// Fixed group rampdown time of 68ms, independent of samplerate
+					std::size_t ramp_length = (68./1000.)*settings.samplerate.load();
+					event_sample.rampdown_count = ramp_length;
+					event_sample.rampdown_offset = event.offset;
+					event_sample.ramp_length = ramp_length;
+				}
+			}
+		}
+	}
+
+	return true;
+}
+
 bool InputProcessor::processStop(event_t& event)
 {
 	if(event.type == EventType::Stop)
diff --git a/src/inputprocessor.h b/src/inputprocessor.h
index 794ca54..2101a25 100644
--- a/src/inputprocessor.h
+++ b/src/inputprocessor.h
@@ -59,6 +59,7 @@ private:
 	bool is_stopping; ///< Is set to true when a EventType::Stop event has been seen.
 
 	bool processOnset(event_t& event, std::size_t pos, double resample_ratio);
+	bool processChoke(event_t& event, std::size_t pos, double resample_ratio);
 	bool processStop(event_t& event);
 
 	std::vector<std::unique_ptr<InputFilter>> filters;
-- 
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