1 files changed, 80 insertions, 0 deletions
diff --git a/src/staminafilter.cc b/src/staminafilter.cc
new file mode 100644
index 0000000..a8f6a86
--- /dev/null
+++ b/src/staminafilter.cc
@@ -0,0 +1,80 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/***************************************************************************
+ *            staminafilter.cc
+ *
+ *  Sat Jun 11 08:49:36 CEST 2016
+ *  Copyright 2016 Bent Bisballe Nyeng
+ *  deva@aasimon.org
+ ****************************************************************************/
+
+/*
+ *  This file is part of DrumGizmo.
+ *
+ *  DrumGizmo is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU Lesser General Public License as published by
+ *  the Free Software Foundation; either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  DrumGizmo 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 Lesser General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Lesser General Public License
+ *  along with DrumGizmo; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA.
+ */
+#include "staminafilter.h"
+
+#include "settings.h"
+
+StaminaFilter::StaminaFilter(Settings& settings)
+	: settings(settings)
+{
+}
+
+bool StaminaFilter::filter(event_t& event, size_t pos)
+{
+	// Read out all values from settings.
+	auto samplerate = settings.samplerate.load();
+	auto velocity_modifier_falloff = settings.velocity_modifier_falloff.load();
+	auto enable_velocity_modifier = settings.enable_velocity_modifier.load();
+	auto velocity_modifier_weight = settings.velocity_modifier_weight.load();
+
+	if(modifiers.find(event.instrument) == modifiers.end())
+	{
+		// On first lookup make sure we have sane values.
+		auto& pair = modifiers[event.instrument];
+		pair.first = 1.0f;
+		pair.second = 0;
+	}
+
+	auto& pair = modifiers[event.instrument];
+	auto& mod = pair.first;
+	auto& lastpos = pair.second;
+
+	if(enable_velocity_modifier == false)
+	{
+		mod = 1.0f;
+		lastpos = 0;
+	}
+
+	if(enable_velocity_modifier)
+	{
+		mod += (pos - lastpos) / (samplerate * velocity_modifier_falloff);
+		if(mod > 1.0f)
+		{
+			mod = 1.0f;
+		}
+	}
+
+	event.velocity *= mod;
+
+	if(enable_velocity_modifier)
+	{
+		lastpos = pos;
+		mod *= velocity_modifier_weight;
+	}
+
+	return true;
+}