From d5a514148bec58cd7e97d032259362b2e19c0e95 Mon Sep 17 00:00:00 2001
From: David Robillard <d@drobilla.net>
Date: Fri, 29 Jan 2010 01:43:54 +0000
Subject: Magic MIDI binding via special ingen_control port. Always set
 lv2:minimum and lv2:maximum properties for control ports so they show up in
 properties dialog (and can be used for MIDI binding).

git-svn-id: http://svn.drobilla.net/lad/trunk/ingen@2391 a436a847-0d15-0410-975c-d299462d15a1
---
 src/engine/ControlBindings.cpp | 96 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 96 insertions(+)
 create mode 100644 src/engine/ControlBindings.cpp

(limited to 'src/engine/ControlBindings.cpp')

diff --git a/src/engine/ControlBindings.cpp b/src/engine/ControlBindings.cpp
new file mode 100644
index 00000000..00241b54
--- /dev/null
+++ b/src/engine/ControlBindings.cpp
@@ -0,0 +1,96 @@
+/* This file is part of Ingen.
+ * Copyright (C) 2009 Dave Robillard <http://drobilla.net>
+ *
+ * Ingen 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.
+ *
+ * Ingen 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 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.,
+ * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include "raul/log.hpp"
+#include "raul/midi_events.h"
+#include "events/SendPortValue.hpp"
+#include "ControlBindings.hpp"
+#include "EventBuffer.hpp"
+#include "PortImpl.hpp"
+#include "ProcessContext.hpp"
+#include "ThreadManager.hpp"
+
+#define LOG(s) s << "[ControlBindings] "
+
+using namespace std;
+using namespace Raul;
+
+namespace Ingen {
+
+
+void
+ControlBindings::learn(PortImpl* port)
+{
+	ThreadManager::assert_thread(THREAD_PRE_PROCESS);
+	_learn_port = port;
+}
+
+
+void
+ControlBindings::set_port_value(ProcessContext& context, PortImpl* port, int8_t value)
+{
+	float min = port->get_property("lv2:minimum").get_float();
+	float max = port->get_property("lv2:maximum").get_float();
+
+	Raul::Atom scaled_value(static_cast<float>(((float)value / 127.0) * (max - min) + min));
+	port->set_value(scaled_value);
+
+	const Events::SendPortValue ev(context.engine(), context.start(), port, true, 0,
+			scaled_value.get_float());
+	context.event_sink().write(sizeof(ev), &ev);
+}
+
+
+void
+ControlBindings::process(ProcessContext& context, EventBuffer* buffer)
+{
+	uint32_t frames    = 0;
+	uint32_t subframes = 0;
+	uint16_t type      = 0;
+	uint16_t size      = 0;
+	uint8_t* buf       = NULL;
+
+	if (_learn_port) {
+		buffer->rewind();
+		while (buffer->get_event(&frames, &subframes, &type, &size, &buf)) {
+			if (type == _map->midi_event && (buf[0] & 0xF0) == MIDI_CMD_CONTROL) {
+				const int8_t controller = static_cast<const int8_t>(buf[1]);
+				_bindings.insert(make_pair(controller, _learn_port));
+				_learn_port = NULL;
+				break;
+			}
+			buffer->increment();
+		}
+	}
+
+	if (!_bindings.empty()) {
+		buffer->rewind();
+		while (buffer->get_event(&frames, &subframes, &type, &size, &buf)) {
+			if (type == _map->midi_event && (buf[0] & 0xF0) == MIDI_CMD_CONTROL) {
+				const int8_t controller = static_cast<const int8_t>(buf[1]);
+				const int8_t value      = static_cast<const int8_t>(buf[2]);
+				Bindings::const_iterator i = _bindings.find(controller);
+				if (i != _bindings.end()) {
+					set_port_value(context, i->second, value);
+				}
+			}
+			buffer->increment();
+		}
+	}
+}
+
+}
-- 
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