From 723343269d161b2bba7aee4597357ffc32f26f04 Mon Sep 17 00:00:00 2001
From: Bent Bisballe Nyeng <deva@aasimon.org>
Date: Mon, 8 Apr 2019 17:42:00 +0200
Subject: Move midi note process to one common place in
 AudioInputEngineMidi::processNote and use it in the four input engines
 (plugin, midifile, ossmidi and jackmidi)

---
 src/audioinputenginemidi.cc | 49 +++++++++++++++++++++++++++++++++++++++++++++
 src/audioinputenginemidi.h  |  5 +++++
 2 files changed, 54 insertions(+)

(limited to 'src')

diff --git a/src/audioinputenginemidi.cc b/src/audioinputenginemidi.cc
index 6e76f19..7b8cbcb 100644
--- a/src/audioinputenginemidi.cc
+++ b/src/audioinputenginemidi.cc
@@ -95,3 +95,52 @@ bool AudioInputEngineMidi::isValid() const
 {
 	return is_valid;
 }
+
+// Note types:
+static const std::uint8_t NoteOff = 0x80;
+static const std::uint8_t NoteOn = 0x90;
+static const std::uint8_t NoteAftertouch = 0xA0;
+
+// Note type mask:
+static int const NoteMask = 0xF0;
+
+void AudioInputEngineMidi::processNote(const std::uint8_t* midi_buffer,
+                                       std::size_t midi_buffer_length,
+                                       std::size_t offset,
+                                       std::vector<event_t>& events)
+{
+	if(midi_buffer_length != 3)
+	{
+		return;
+	}
+
+	auto key = midi_buffer[1];
+	auto velocity = midi_buffer[2];
+	auto instrument_idx = mmap.lookup(key);
+
+	switch(midi_buffer[0] & NoteMask)
+	{
+	case NoteOff:
+		// Ignore for now
+		break;
+
+	case NoteOn:
+		if(instrument_idx != -1)
+		{
+			events.push_back({EventType::OnSet, (std::size_t)instrument_idx,
+			                  offset, velocity / 127.0f});
+		}
+		break;
+
+	case NoteAftertouch:
+		if(velocity == 0 && instrument_idx != -1)
+		{
+			events.push_back({EventType::Choke, (std::size_t)instrument_idx,
+			                  offset, .0f});
+		}
+		break;
+
+	default:
+		break;
+	}
+}
diff --git a/src/audioinputenginemidi.h b/src/audioinputenginemidi.h
index e02ba21..8da7bd2 100644
--- a/src/audioinputenginemidi.h
+++ b/src/audioinputenginemidi.h
@@ -57,6 +57,11 @@ public:
 
 	bool isValid() const;
 
+	void processNote(const std::uint8_t* note_data,
+	                 std::size_t note_data_size,
+	                 std::size_t offset,
+	                 std::vector<event_t>& events);
+
 protected:
 	MidiMapper mmap;
 
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