From 50bf217c8d519e29613e0f0d653b631105b348a8 Mon Sep 17 00:00:00 2001
From: Bent Bisballe Nyeng <deva@aasimon.org>
Date: Fri, 5 Jun 2020 18:55:36 +0200
Subject: Double trigger filter.

---
 src/doubletriggerfilter.cc | 75 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 75 insertions(+)
 create mode 100644 src/doubletriggerfilter.cc

(limited to 'src/doubletriggerfilter.cc')

diff --git a/src/doubletriggerfilter.cc b/src/doubletriggerfilter.cc
new file mode 100644
index 0000000..77ba02d
--- /dev/null
+++ b/src/doubletriggerfilter.cc
@@ -0,0 +1,75 @@
+/* -*- Mode: c++ -*- */
+/***************************************************************************
+ *            doubletriggerfilter.cc
+ *
+ *  Fri Jun  5 18:26:32 CEST 2020
+ *  Copyright 2020 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 "doubletriggerfilter.h"
+
+#include "latencyfilter.h"
+
+#include <cmath>
+#include <hugin.hpp>
+
+#include "settings.h"
+#include "random.h"
+
+DoubleTriggerFilter::DoubleTriggerFilter(Settings& settings)
+	: settings(settings)
+{
+	lastStrokes.resize(127, 0.0); // initialise to all zeros
+}
+
+template<typename T1, typename T2>
+static T1 getDistanceSamples(T1 min_dist_ms, T2 samplerate)
+{
+	return min_dist_ms * samplerate / 1000.;
+}
+
+bool DoubleTriggerFilter::filter(event_t& event, std::size_t pos)
+{
+	auto enabled = true;//settings.enable_latency_modifier.load();
+	auto min_dist_ms = 25.0;//settings.latency_max_ms.load();
+	auto samplerate = settings.samplerate.load();
+
+	if(!enabled)
+	{
+		return true;
+	}
+
+	auto min_dist = getDistanceSamples(min_dist_ms, samplerate);
+	double note_pos = pos + event.offset;
+	if(event.instrument >= lastStrokes.size())
+	{
+		lastStrokes.resize(event.instrument, 0.0); // expand and initialise to zeros
+	}
+
+	auto lastStroke = lastStrokes[event.instrument];
+	if((note_pos - lastStroke) > min_dist)
+	{
+		lastStrokes[event.instrument] = note_pos;
+		return true;
+	}
+
+	return false;
+}
-- 
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