From 04004d21783ba16a24187d4c25e2575b4227c30f Mon Sep 17 00:00:00 2001
From: Paul Davis <paul@linuxaudiosystems.com>
Date: Tue, 1 Feb 2022 17:33:44 -0700
Subject: [PATCH] add skeleton for full MidiStateTracker

---
 libs/ardour/ardour/midi_state_tracker.h | 28 +++++++-
 libs/ardour/midi_state_tracker.cc       | 87 +++++++++++++++++++++++++
 2 files changed, 112 insertions(+), 3 deletions(-)

diff --git a/libs/ardour/ardour/midi_state_tracker.h b/libs/ardour/ardour/midi_state_tracker.h
index a69e5efddc..0922c8c1d4 100644
--- a/libs/ardour/ardour/midi_state_tracker.h
+++ b/libs/ardour/ardour/midi_state_tracker.h
@@ -41,16 +41,19 @@ class LIBARDOUR_API MidiNoteTracker
 {
 public:
 	MidiNoteTracker();
+	virtual ~MidiNoteTracker() {}
+
+	virtual void track (const uint8_t* evbuf);
+	virtual void dump (std::ostream&);
+	virtual void reset ();
 
 	void track (const MidiBuffer::const_iterator& from, const MidiBuffer::const_iterator& to);
-	void track (const uint8_t* evbuf);
 	void add (uint8_t note, uint8_t chn);
 	void remove (uint8_t note, uint8_t chn);
 	void resolve_notes (MidiBuffer& buffer, samplepos_t time);
 	void resolve_notes (Evoral::EventSink<samplepos_t>& buffer, samplepos_t time);
 	void resolve_notes (MidiSource& src, const Glib::Threads::Mutex::Lock& lock, Temporal::Beats time);
-	void dump (std::ostream&);
-	void reset ();
+
 	bool empty() const { return _on == 0; }
 	uint16_t on() const { return _on; }
 	bool active (uint8_t note, uint8_t channel) {
@@ -67,6 +70,25 @@ private:
 	uint16_t _on;
 };
 
+class LIBARDOUR_API MidiStateTracker : public MidiNoteTracker
+{
+  public:
+	MidiStateTracker ();
+	~MidiStateTracker() {}
+
+	void track (const uint8_t* evbuf);
+	void dump (std::ostream&);
+	void reset ();
+
+	void resolve (MidiBuffer&, samplepos_t);
+
+  private:
+	uint8_t  have_program[16];
+	uint8_t  program[16];
+	uint16_t bender[16];
+	uint16_t pressure[16];
+	uint8_t  control[16][127];
+};
 
 } // namespace ARDOUR
 
diff --git a/libs/ardour/midi_state_tracker.cc b/libs/ardour/midi_state_tracker.cc
index 10877c89dc..4d7128d3fb 100644
--- a/libs/ardour/midi_state_tracker.cc
+++ b/libs/ardour/midi_state_tracker.cc
@@ -212,3 +212,90 @@ MidiNoteTracker::dump (ostream& o)
 	}
 	o << "+++++\n";
 }
+
+/*----------------*/
+
+MidiStateTracker::MidiStateTracker ()
+{
+	reset ();
+}
+
+void
+MidiStateTracker::reset ()
+{
+	const size_t n_channels = 16;
+	const size_t n_controls = 127;
+
+	MidiNoteTracker::reset ();
+
+	for (size_t n = 0; n < n_channels; ++n) {
+		have_program[n] = 0;
+	}
+
+	for (size_t n = 0; n < n_channels; ++n) {
+		program[n] = 0;
+	}
+
+	for (size_t chn = 0; chn < n_channels; ++chn) {
+		for (size_t c = 0; c < n_controls; ++c) {
+			control[chn][c] = 0;
+		}
+	}
+}
+
+void
+MidiStateTracker::dump (ostream& o)
+{
+	MidiNoteTracker::dump (o);
+	o << "implement MidiStateTracker::dump()";
+}
+
+void
+MidiStateTracker::track (const uint8_t* evbuf)
+{
+	const uint8_t type = evbuf[0] & 0xF0;
+	const uint8_t chan = evbuf[0] & 0x0F;
+	switch (type) {
+	case MIDI_CTL_ALL_NOTES_OFF:
+		MidiNoteTracker::reset();
+		break;
+	case MIDI_CMD_NOTE_ON:
+		add (evbuf[1], chan);
+		break;
+	case MIDI_CMD_NOTE_OFF:
+		remove (evbuf[1], chan);
+		break;
+
+	case MIDI_CMD_CONTROL:
+		control[chan][evbuf[1]] = evbuf[2];
+		break;
+
+	case MIDI_CMD_PGM_CHANGE:
+		program[chan] = evbuf[1];
+		have_program[chan] = 1;
+		break;
+
+	case MIDI_CMD_CHANNEL_PRESSURE:
+		pressure[chan] = evbuf[1];
+		break;
+
+	case MIDI_CMD_NOTE_PRESSURE:
+		break;
+
+	case MIDI_CMD_BENDER:
+		break;
+
+	case MIDI_CMD_COMMON_RESET:
+		reset ();
+		break;
+
+	default:
+		break;
+	}
+}
+
+void
+MidiStateTracker::resolve (MidiBuffer& buffer, samplepos_t time)
+{
+	/* XXX implement me */
+}