Merge branch 'distance' into edrumulus

17 files changed, 213 insertions, 32 deletions

diff --git a/src/DGDOM.h b/src/DGDOM.h
index 474b29c..a03f0ef 100644
--- a/src/DGDOM.h
+++ b/src/DGDOM.h
@@ -59,6 +59,7 @@ struct SampleDOM
 {
 	std::string name;
 	double power; // >= v2.0 only
+	double position; // >=v2.0 only
 	bool normalized; // >= v2.0 only
 	std::vector<AudioFileDOM> audiofiles;
 };
diff --git a/src/Makefile.am b/src/Makefile.am
index b656f48..3e691b1 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -75,6 +75,7 @@ libdg_la_SOURCES = \
 	staminafilter.cc \
 	thread.cc \
 	velocityfilter.cc \
+	positionfilter.cc \
 	versionstr.cc
 
 EXTRA_DIST = \
@@ -138,5 +139,6 @@ EXTRA_DIST = \
 	thread.h \
 	translation.h \
 	velocityfilter.h \
+	positionfilter.h \
 	versionstr.h \
 	zrwrapper.h
diff --git a/src/audioinputenginemidi.cc b/src/audioinputenginemidi.cc
index ce3ce18..f6fedd6 100644
--- a/src/audioinputenginemidi.cc
+++ b/src/audioinputenginemidi.cc
@@ -100,9 +100,13 @@ bool AudioInputEngineMidi::isValid() const
 static const std::uint8_t NoteOff = 0x80;
 static const std::uint8_t NoteOn = 0x90;
 static const std::uint8_t NoteAftertouch = 0xA0;
+static const std::uint8_t ControlChange = 0xB0;
 
 // Note type mask:
-static int const NoteMask = 0xF0;
+static const std::uint8_t TypeMask = 0xF0;
+
+// See:
+// https://www.midi.org/specifications-old/item/table-1-summary-of-midi-message
 
 void AudioInputEngineMidi::processNote(const std::uint8_t* midi_buffer,
                                        std::size_t midi_buffer_length,
@@ -114,35 +118,59 @@ void AudioInputEngineMidi::processNote(const std::uint8_t* midi_buffer,
 		return;
 	}
 
-	auto key = midi_buffer[1];
-	auto velocity = midi_buffer[2];
-	auto instrument_idx = mmap.lookup(key);
-
-	switch(midi_buffer[0] & NoteMask)
+	switch(midi_buffer[0] & TypeMask)
 	{
 	case NoteOff:
 		// Ignore for now
 		break;
 
 	case NoteOn:
-		if(velocity != 0 && instrument_idx != -1)
 		{
-			// maps velocities to [.5/127, 126.5/127]
-			auto centered_velocity = (velocity-.5f)/127.0f;
-			events.push_back({EventType::OnSet, (std::size_t)instrument_idx,
-			                  offset, centered_velocity});
+			auto key = midi_buffer[1];
+			auto velocity = midi_buffer[2];
+			auto instrument_idx = mmap.lookup(key);
+			if(velocity != 0 && instrument_idx != -1)
+			{
+				// maps velocities to [.5/127, 126.5/127]
+				auto centered_velocity = (velocity-.5f)/127.0f;
+				events.push_back({ EventType::OnSet, (std::size_t)instrument_idx,
+				                   offset, centered_velocity, positional_information });
+			}
 		}
 		break;
 
 	case NoteAftertouch:
-		if(velocity == 0 && instrument_idx != -1)
 		{
-			events.push_back({EventType::Choke, (std::size_t)instrument_idx,
-			                  offset, .0f});
+			auto key = midi_buffer[1];
+			auto velocity = midi_buffer[2];
+			auto instrument_idx = mmap.lookup(key);
+			if(velocity == 0 && instrument_idx != -1)
+			{
+				events.push_back({ EventType::Choke, (std::size_t)instrument_idx,
+				                   offset, .0f, .0f });
+			}
+		}
+		break;
+
+	case ControlChange:
+		{
+			auto controller_number = midi_buffer[1];
+			auto value = midi_buffer[2];
+			if(controller_number == 16) // positional information
+			{
+				// Store value for use in next NoteOn event.
+				positional_information = value / 127.0f;
+
+				// Return here to prevent reset of cached positional information.
+				return;
+			}
 		}
 		break;
 
 	default:
 		break;
 	}
+
+	// Clear cached positional information.
+	positional_information = 0.0f;
 }
diff --git a/src/audioinputenginemidi.h b/src/audioinputenginemidi.h
index 8da7bd2..12efd66 100644
--- a/src/audioinputenginemidi.h
+++ b/src/audioinputenginemidi.h
@@ -70,4 +70,6 @@ private:
 	bool is_valid;
 
 	ConfigFile refs;
+
+	float positional_information{0.0f};
 };
diff --git a/src/dgxmlparser.cc b/src/dgxmlparser.cc
index 0d3cdcd..bd9af66 100644
--- a/src/dgxmlparser.cc
+++ b/src/dgxmlparser.cc
@@ -358,9 +358,19 @@ bool parseInstrumentFile(const std::string& filename, InstrumentDOM& dom, LogFun
 		}
 		else
 		{
-			res &= attrcpy(dom.samples.back().power, sample, "power", logger, filename);
-			dom.samples.back().normalized = false;
-			res &= attrcpy(dom.samples.back().normalized, sample, "normalized", logger, filename, true);
+			res &= attrcpy(dom.samples.back().power, sample, "power",
+			               logger, filename);
+
+			dom.samples.back().position = 0.0; // optional - defaults to 0
+			res &= attrcpy(dom.samples.back().position, sample, "position",
+			               logger, filename, true);
+			// Clamp to [0; 1] range.
+			dom.samples.back().position =
+				std::min(1.0, std::max(dom.samples.back().position, 0.0));
+
+			dom.samples.back().normalized = false; // optional - defaults to false
+			res &= attrcpy(dom.samples.back().normalized, sample, "normalized",
+			               logger, filename, true);
 		}
 
 		for(pugi::xml_node audiofile: sample.children("audiofile"))
diff --git a/src/domloader.cc b/src/domloader.cc
index c78ed75..5d411bd 100644
--- a/src/domloader.cc
+++ b/src/domloader.cc
@@ -99,6 +99,7 @@ bool DOMLoader::loadDom(const std::string& basepath,
 			for(const auto& sampledom : instrumentdom.samples)
 			{
 				auto sample = new Sample(sampledom.name, sampledom.power,
+				                         sampledom.position,
 				                         sampledom.normalized);
 				for(const auto& audiofiledom : sampledom.audiofiles)
 				{
diff --git a/src/event.h b/src/event.h
index 737fb18..5780cc9 100644
--- a/src/event.h
+++ b/src/event.h
@@ -39,8 +39,9 @@ enum class EventType
 //! POD datatype for input event transport.
 struct event_t
 {
-	EventType type; //!< The type of the event.
-	std::size_t instrument; //!< The instrument number.
-	std::size_t offset; //!< The offset position in the input buffer
-	float velocity; //!< The velocity if the type is a note on [0; 1]
+	EventType type;          //!< The type of the event.
+	std::size_t instrument;  //!< The instrument number.
+	std::size_t offset;      //!< The offset position in the input buffer
+	float velocity;          //!< The velocity if the type is a note on [0; 1]
+	float position;          //!< The position of the note. 0 := center, 1 := rim
 };
diff --git a/src/inputprocessor.cc b/src/inputprocessor.cc
index 4bafb1d..a883286 100644
--- a/src/inputprocessor.cc
+++ b/src/inputprocessor.cc
@@ -36,6 +36,7 @@
 #include "powermapfilter.h"
 #include "staminafilter.h"
 #include "velocityfilter.h"
+#include "positionfilter.h"
 
 #include "cpp11fix.h"
 
@@ -93,6 +94,7 @@ InputProcessor::InputProcessor(Settings& settings,
 	filters.emplace_back(std::make_unique<StaminaFilter>(settings));
 	filters.emplace_back(std::make_unique<LatencyFilter>(settings, random));
 	filters.emplace_back(std::make_unique<VelocityFilter>(settings, random));
+	filters.emplace_back(std::make_unique<PositionFilter>(settings, random));
 	filters.emplace_back(std::make_unique<Reporter>(settings, original_velocity));
 }
 
@@ -244,7 +246,8 @@ bool InputProcessor::processOnset(event_t& event, std::size_t pos,
 	auto const power_min = instr->getMinPower();
 	float const power_span = power_max - power_min;
 	float const instrument_level = power_min + event.velocity*power_span;
-	const auto sample = instr->sample(instrument_level, event.offset + pos);
+	// FIXME: bad variable naming of parameters
+	const auto sample = instr->sample(instrument_level, event.position, event.offset + pos);
 
 	if(sample == nullptr)
 	{
diff --git a/src/instrument.cc b/src/instrument.cc
index b7bcdd9..ac6aa28 100644
--- a/src/instrument.cc
+++ b/src/instrument.cc
@@ -54,12 +54,13 @@ bool Instrument::isValid() const
 	return this == magic;
 }
 
-const Sample* Instrument::sample(level_t level, size_t pos)
+// FIXME: very bad variable naming of parameters
+const Sample* Instrument::sample(level_t level, float position , std::size_t pos)
 {
 	if(version >= VersionStr("2.0"))
 	{
 		// Version 2.0
-		return sample_selection.get(level * mod, pos);
+		return sample_selection.get(level * mod, position, pos);
 	}
 	else
 	{
diff --git a/src/instrument.h b/src/instrument.h
index c06ccdc..89918de 100644
--- a/src/instrument.h
+++ b/src/instrument.h
@@ -49,7 +49,8 @@ public:
 	Instrument(Settings& settings, Random& rand);
 	~Instrument();
 
-	const Sample* sample(level_t level, size_t pos);
+	// FIXME: variable naming
+	const Sample* sample(level_t level, float position, std::size_t pos);
 
 	std::size_t getID() const;
 	const std::string& getName() const;
diff --git a/src/positionfilter.cc b/src/positionfilter.cc
new file mode 100644
index 0000000..8d2f987
--- /dev/null
+++ b/src/positionfilter.cc
@@ -0,0 +1,48 @@
+/* -*- Mode: c++ -*- */
+/***************************************************************************
+ *            positionfilter.cc
+ *
+ *  Sat 13 Feb 2021 12:46:41 CET
+ *  Copyright 2019 André Nusser
+ *  andre.nusser@googlemail.com
+ ****************************************************************************/
+
+/*
+ *  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 "positionfilter.h"
+
+#include "random.h"
+#include "settings.h"
+
+PositionFilter::PositionFilter(Settings& settings, Random& random)
+	: settings(settings), random(random)
+{
+}
+
+bool PositionFilter::filter(event_t& event, size_t pos)
+{
+	if (settings.enable_velocity_modifier.load())
+	{
+		float mean = event.position;
+		float stddev = settings.position_stddev.load();
+		// the 30.0f were determined empirically
+		event.position = random.normalDistribution(mean, stddev / 30.0f); // FIXME: right magic value?
+	}
+
+	return true;
+}
diff --git a/src/positionfilter.h b/src/positionfilter.h
new file mode 100644
index 0000000..ac989f6
--- /dev/null
+++ b/src/positionfilter.h
@@ -0,0 +1,52 @@
+/* -*- Mode: c++ -*- */
+/***************************************************************************
+ *            positionfilter.h
+ *
+ *  Sat 13 Feb 2021 12:46:41 CET
+ *  Copyright 2019 André Nusser
+ *  andre.nusser@googlemail.com
+ ****************************************************************************/
+
+/*
+ *  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.
+ */
+#pragma once
+
+#include <cstddef>
+#include <map>
+#include <utility>
+
+#include "inputfilter.h"
+#include "instrument.h"
+
+struct Settings;
+class Random;
+
+class PositionFilter
+	: public InputFilter
+{
+public:
+	PositionFilter(Settings& settings, Random& random);
+
+	bool filter(event_t& event, std::size_t pos) override;
+
+	// Note getLatency not overloaded because this filter doesn't add latency.
+
+private:
+	Settings& settings;
+	Random& random;
+};
diff --git a/src/sample.cc b/src/sample.cc
index 9af2c08..2c59f5e 100644
--- a/src/sample.cc
+++ b/src/sample.cc
@@ -28,9 +28,11 @@
 
 #include <sndfile.h>
 
-Sample::Sample(const std::string& name, double power, bool normalized)
+Sample::Sample(const std::string& name, double power, double position,
+               bool normalized)
 	: name{name}
 	, power{power}
+	, position{position}
 	, normalized(normalized)
 	, audiofiles{}
 {
@@ -69,6 +71,11 @@ double Sample::getPower() const
 	return power;
 }
 
+double Sample::getPosition() const
+{
+	return position;
+}
+
 bool Sample::getNormalized() const
 {
 	return normalized;
diff --git a/src/sample.h b/src/sample.h
index 6c31b6b..b13f624 100644
--- a/src/sample.h
+++ b/src/sample.h
@@ -37,12 +37,14 @@ using AudioFiles = std::map<const InstrumentChannel*, AudioFile*>;
 class Sample
 {
 public:
-	Sample(const std::string& name, double power, bool normalized = false);
+	Sample(const std::string& name, double power, double position,
+	       bool normalized = false);
 	~Sample();
 
 	AudioFile* getAudioFile(const Channel& channel) const;
 
 	double getPower() const;
+	double getPosition() const;
 	bool getNormalized() const;
 
 private:
@@ -55,6 +57,7 @@ private:
 
 	std::string name;
 	double power;
+	double position{0.0};
 	bool normalized;
 	AudioFiles audiofiles;
 };
diff --git a/src/sample_selection.cc b/src/sample_selection.cc
index 7267faf..0ff2c51 100644
--- a/src/sample_selection.cc
+++ b/src/sample_selection.cc
@@ -54,7 +54,9 @@ void SampleSelection::finalise()
 	last.assign(powerlist.getPowerListItems().size(), 0);
 }
 
-const Sample* SampleSelection::get(level_t level, std::size_t pos)
+// FIXME: For the position, weird hacks via the powerlist are necessary. Refactor!
+// FIXME: bad variable naming
+const Sample* SampleSelection::get(level_t level, float position, std::size_t pos)
 {
 	const auto& samples = powerlist.getPowerListItems();
 	if(!samples.size())
@@ -64,14 +66,17 @@ const Sample* SampleSelection::get(level_t level, std::size_t pos)
 
 	std::size_t index_opt = 0;
 	float power_opt{0.f};
+	float pos_opt{0.f};
 	float value_opt{std::numeric_limits<float>::max()};
 	// the following three values are mostly for debugging
-	float random_opt = 0.;
 	float close_opt = 0.;
+	float closepos_opt = 0.;
+	float random_opt = 0.;
 	float diverse_opt = 0.;
 
 	// Note the magic values in front of the settings factors.
 	const float f_close = 4.*settings.sample_selection_f_close.load();
+	const float f_position = 1000.*settings.sample_selection_f_position.load(); // FIXME: huge factor for now
 	const float f_diverse = (1./2.)*settings.sample_selection_f_diverse.load();
 	const float f_random = (1./3.)*settings.sample_selection_f_random.load();
 
@@ -137,22 +142,26 @@ const Sample* SampleSelection::get(level_t level, std::size_t pos)
 		auto random = rand.floatInRange(0.,1.);
 		auto close = (samples[current_index].power - level)/power_range;
 		auto diverse = 1./(1. + (float)(pos - last[current_index])/settings.samplerate);
-		auto value = f_close*pow2(close) + f_diverse*diverse + f_random*random;
+		auto closepos = samples[current_index].sample->getPosition() - position;
+		// note that the value below for close and closepos is actually the weighted squared l2 distance in 2d
+		auto value = f_close*pow2(close) + f_position*pow2(closepos) + f_diverse*diverse + f_random*random;
 
 		if (value < value_opt)
 		{
 			index_opt = current_index;
 			power_opt = samples[current_index].power;
+			pos_opt = samples[current_index].sample->getPosition();
 			value_opt = value;
 			random_opt = random;
 			close_opt = close;
 			diverse_opt = diverse;
+			closepos_opt = closepos;
 		}
 		++count;
 	}
 	while (up_value_lb <= value_opt || down_value_lb <= value_opt);
 
-	DEBUG(rand, "Chose sample with index: %d, value: %f, power %f, random: %f, close: %f, diverse: %f, count: %d", (int)index_opt, value_opt, power_opt, random_opt, close_opt, diverse_opt, (int)count);
+	DEBUG(rand, "Chose sample with index: %d, value: %f, power: %f, position: %f, random: %f, close: %f, diverse: %f, closepos: %f, count: %d", (int)index_opt, value_opt, power_opt, pos_opt, random_opt, close_opt, diverse_opt, closepos_opt, (int)count);
 
 	last[index_opt] = pos;
 	return samples[index_opt].sample;
diff --git a/src/sample_selection.h b/src/sample_selection.h
index 8da4e0d..1f6b290 100644
--- a/src/sample_selection.h
+++ b/src/sample_selection.h
@@ -40,7 +40,7 @@ public:
 	SampleSelection(Settings& settings, Random& rand, const PowerList& powerlist);
 
 	void finalise();
-	const Sample* get(level_t level, std::size_t pos);
+	const Sample* get(level_t level, float position, std::size_t pos);
 
 private:
 	Settings& settings;
diff --git a/src/settings.h b/src/settings.h
index fb93d79..5c2e4ee 100644
--- a/src/settings.h
+++ b/src/settings.h
@@ -76,13 +76,17 @@ struct Settings
 	static float constexpr velocity_modifier_falloff_default = 0.5f;
 	static float constexpr velocity_modifier_weight_default = 0.25f;
 	static float constexpr velocity_stddev_default = .45f;
+	static float constexpr position_stddev_default = 0.f; // FIXME: set to something sensible
 	static float constexpr sample_selection_f_close_default = .85f;
+	static float constexpr sample_selection_f_position_default = 1.f;
 	static float constexpr sample_selection_f_diverse_default = .16f;
 	static float constexpr sample_selection_f_random_default = .07f;
 	Atomic<float> velocity_modifier_falloff{velocity_modifier_falloff_default};
 	Atomic<float> velocity_modifier_weight{velocity_modifier_weight_default};
 	Atomic<float> velocity_stddev{velocity_stddev_default};
+	Atomic<float> position_stddev{position_stddev_default};
 	Atomic<float> sample_selection_f_close{sample_selection_f_close_default};
+	Atomic<float> sample_selection_f_position{sample_selection_f_position_default};
 	Atomic<float> sample_selection_f_diverse{sample_selection_f_diverse_default};
 	Atomic<float> sample_selection_f_random{sample_selection_f_random_default};
 
@@ -200,7 +204,9 @@ struct SettingsGetter
 	SettingRef<float> velocity_modifier_falloff;
 	SettingRef<float> velocity_modifier_weight;
 	SettingRef<float> velocity_stddev;
+	SettingRef<float> position_stddev;
 	SettingRef<float> sample_selection_f_close;
+	SettingRef<float> sample_selection_f_position;
 	SettingRef<float> sample_selection_f_diverse;
 	SettingRef<float> sample_selection_f_random;
 
@@ -275,7 +281,9 @@ struct SettingsGetter
 		, velocity_modifier_falloff{settings.velocity_modifier_falloff}
 		, velocity_modifier_weight{settings.velocity_modifier_weight}
 		, velocity_stddev{settings.velocity_stddev}
+		, position_stddev{settings.position_stddev}
 		, sample_selection_f_close{settings.sample_selection_f_close}
+		, sample_selection_f_position{settings.sample_selection_f_position}
 		, sample_selection_f_diverse{settings.sample_selection_f_diverse}
 		, sample_selection_f_random{settings.sample_selection_f_random}
 		, sample_selection_retry_count(settings.sample_selection_retry_count)
@@ -345,7 +353,9 @@ public:
 	Notifier<float> velocity_modifier_falloff;
 	Notifier<float> velocity_modifier_weight;
 	Notifier<float> velocity_stddev;
+	Notifier<float> position_stddev;
 	Notifier<float> sample_selection_f_close;
+	Notifier<float> sample_selection_f_position;
 	Notifier<float> sample_selection_f_diverse;
 	Notifier<float> sample_selection_f_random;
 	Notifier<std::size_t> sample_selection_retry_count;
@@ -424,7 +434,9 @@ public:
 		EVAL(velocity_modifier_falloff);
 		EVAL(velocity_modifier_weight);
 		EVAL(velocity_stddev);
+		EVAL(position_stddev);
 		EVAL(sample_selection_f_close);
+		EVAL(sample_selection_f_position);
 		EVAL(sample_selection_f_diverse);
 		EVAL(sample_selection_f_random);
 		EVAL(sample_selection_retry_count);