merge (squash) with scenechange topic branch to provide MIDI-driven scene change markers

1 files changed, 144 insertions, 0 deletions

diff --git a/libs/ardour/midi_scene_change.cc b/libs/ardour/midi_scene_change.cc
new file mode 100644
index 0000000000..81a74911a9
--- /dev/null
+++ b/libs/ardour/midi_scene_change.cc
@@ -0,0 +1,144 @@
+/*
+    Copyright (C) 2014 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 "pbd/error.h"
+#include "pbd/compose.h"
+
+#include "ardour/midi_port.h"
+#include "ardour/midi_scene_change.h"
+
+#include "i18n.h"
+
+using namespace PBD;
+using namespace ARDOUR;
+
+MIDISceneChange::MIDISceneChange (framepos_t time, int c, int b, int p)
+	: SceneChange (time)
+	, _bank (b)
+	, _program (p)
+	, _channel (c & 0xf)
+{
+	if (_bank > 16384) {
+		_bank = -1;
+	}
+
+	if (_program > 128) {
+		_program = -1;
+	}
+}
+
+MIDISceneChange::MIDISceneChange (const XMLNode& node, int version)
+	: SceneChange (0)
+	, _bank (-1)
+	, _program (-1)
+	, _channel (-1)
+{
+	set_state (node, version);
+}
+
+MIDISceneChange::~MIDISceneChange ()
+{
+}
+
+size_t
+MIDISceneChange::get_bank_msb_message (uint8_t* buf, size_t size) const
+{
+	if (size < 3 || _bank < 0) {
+		return 0;
+	}
+
+	buf[0] = 0xB0 | (_channel & 0xf);
+	buf[1] = 0x0;
+	buf[2] = (_bank & 0xf700) >> 8;
+
+	return 3;
+}
+
+size_t
+MIDISceneChange::get_bank_lsb_message (uint8_t* buf, size_t size) const
+{
+	if (size < 3 || _bank < 0) {
+		return 0;
+	}
+
+	buf[0] = 0xB0 | (_channel & 0xf);
+	buf[1] = 0x20;
+	buf[2] = (_bank & 0xf7);	
+
+	return 3;
+}
+
+size_t
+MIDISceneChange::get_program_message (uint8_t* buf, size_t size) const
+{
+	if (size < 2 || _program < 0) {
+		return 0;
+	}
+
+	buf[0] = 0xC0 | (_channel & 0xf);
+	buf[1] = _program & 0xf7;
+
+	return 2;
+}
+
+XMLNode&
+MIDISceneChange::get_state ()
+{
+	char buf[32];
+	XMLNode* node = new XMLNode (SceneChange::xml_node_name);
+
+	node->add_property (X_("type"), X_("MIDI"));
+	snprintf (buf, sizeof (buf), "%d", (int) _program);
+	node->add_property (X_("id"), id().to_s());
+	snprintf (buf, sizeof (buf), "%d", (int) _program);
+	node->add_property (X_("program"), buf);
+	snprintf (buf, sizeof (buf), "%d", (int) _bank);
+	node->add_property (X_("bank"), buf);
+	snprintf (buf, sizeof (buf), "%d", (int) _channel);
+	node->add_property (X_("channel"), buf);
+
+	return *node;
+}
+
+int
+MIDISceneChange::set_state (const XMLNode& node, int /* version-ignored */)
+{
+	if (!set_id (node)) {
+		return -1;
+	}
+
+	const XMLProperty* prop;
+
+	if ((prop = node.property (X_("program"))) == 0) {
+		return -1;
+	}
+	_program = atoi (prop->value());
+
+	if ((prop = node.property (X_("bank"))) == 0) {
+		return -1;
+	}
+	_bank = atoi (prop->value());
+
+	if ((prop = node.property (X_("channel"))) == 0) {
+		return -1;
+	}
+	_channel = atoi (prop->value());
+
+	return 0;
+}