start breaking apart the various controls into their own headers and source code, and making each control know how to generate MIDI; throttle delivery of meter data and get meter ID right

git-svn-id: svn://localhost/ardour2/branches/3.0@11846 d708f5d6-7413-0410-9779-e7cbd77b26cf

1 files changed, 92 insertions, 0 deletions

diff --git a/libs/surfaces/mackie/meter.cc b/libs/surfaces/mackie/meter.cc
new file mode 100644
index 0000000000..a6aea1f6ed
--- /dev/null
+++ b/libs/surfaces/mackie/meter.cc
@@ -0,0 +1,92 @@
+/*
+	Copyright (C) 2006,2007 John Anderson
+	Copyright (C) 2012 Paul Davis
+
+	This program is free software; you can redistribute it and/or modify
+	it under the terms of the GNU General Public License as published by
+	the Free Software Foundation; either version 2 of the License, or
+	(at your option) any later version.
+
+	This program is distributed in the hope that it will be useful,
+	but WITHOUT ANY WARRANTY; without even the implied warranty of
+	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+	GNU General Public License for more details.
+
+	You should have received a copy of the GNU General Public License
+	along with this program; if not, write to the Free Software
+	Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+*/
+
+#include <cmath>
+
+#include "meter.h"
+#include "surface.h"
+#include "surface_port.h"
+#include "control_group.h"
+
+using namespace Mackie;
+
+Control*
+Meter::factory (Surface& surface, int id, int ordinal, const char* name, Group& group)
+{
+	Meter* m = new Meter (id, ordinal, name, group);
+	surface.meters[id] = m;
+	surface.controls.push_back (m);
+	group.add (*m);
+	return m;
+}
+
+MidiByteArray
+Meter::update_message (float dB)
+{
+	float def = 0.0f; /* Meter deflection %age */
+	
+	if (dB < -70.0f) {
+		def = 0.0f;
+	} else if (dB < -60.0f) {
+		def = (dB + 70.0f) * 0.25f;
+	} else if (dB < -50.0f) {
+		def = (dB + 60.0f) * 0.5f + 2.5f;
+	} else if (dB < -40.0f) {
+		def = (dB + 50.0f) * 0.75f + 7.5f;
+	} else if (dB < -30.0f) {
+		def = (dB + 40.0f) * 1.5f + 15.0f;
+	} else if (dB < -20.0f) {
+		def = (dB + 30.0f) * 2.0f + 30.0f;
+	} else if (dB < 6.0f) {
+		def = (dB + 20.0f) * 2.5f + 50.0f;
+	} else {
+		def = 115.0f;
+	}
+	
+	/* 115 is the deflection %age that would be
+	   when dB=6.0. this is an arbitrary
+	   endpoint for our scaling.
+	*/
+
+	MidiByteArray msg;
+	
+	if (def > 100.0f) {
+		if (!overload_on) {
+			overload_on = true;
+			msg << MidiByteArray (2, 0xd0, (raw_id() << 4) | 0xe);
+		}
+	} else {
+		if (overload_on) {
+			overload_on = false;
+			msg << MidiByteArray (2, 0xd0, (raw_id() << 4) | 0xf);
+		}
+	}
+	
+	/* we can use up to 13 segments */
+
+	int segment = lrintf ((def/115.0) * 13.0);
+	
+	if (last_segment_value_sent != segment) {
+		last_segment_value_sent = segment;
+		std::cerr << "Meter ID " << raw_id() << " as byte " << (((int) raw_id() << 4) | segment) << std::endl;
+		msg << MidiByteArray (2, 0xD0, (raw_id()<<4) | segment);
+	}
+
+	return msg;
+}