From 36a62ae3403f7cfb02bd8dde43b6b2fa96fe867b Mon Sep 17 00:00:00 2001
From: Bent Bisballe Nyeng <deva@aasimon.org>
Date: Sat, 14 May 2016 20:27:56 +0200
Subject: Make all components use the same Random instance and add seed method
 on DrumGizmo class. Added dgreftest application for doing reference midifile
 rendering tests.

---
 test/dgreftest/midiinputengine.cc | 192 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 192 insertions(+)
 create mode 100644 test/dgreftest/midiinputengine.cc

(limited to 'test/dgreftest/midiinputengine.cc')

diff --git a/test/dgreftest/midiinputengine.cc b/test/dgreftest/midiinputengine.cc
new file mode 100644
index 0000000..bc0fa87
--- /dev/null
+++ b/test/dgreftest/midiinputengine.cc
@@ -0,0 +1,192 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/***************************************************************************
+ *            midiinputengine.cc
+ *
+ *  Sat May 14 13:26:23 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 "midiinputengine.h"
+
+#include <iostream>
+
+static int const NOTE_ON = 0x90;
+
+MidifileInputEngine::MidifileInputEngine()
+	: AudioInputEngineMidi{}
+	, smf{nullptr}
+	, current_event{nullptr}
+	, file{}
+	, speed{1.f}
+	, track{-1} // all tracks
+	, loop{false}
+	, offset{0.0}
+	, samplerate{44100.0} // todo: via ctor arg
+{
+}
+
+MidifileInputEngine::~MidifileInputEngine()
+{
+	if(smf != nullptr)
+	{
+		smf_delete(smf);
+	}
+}
+
+bool MidifileInputEngine::init(const Instruments& instruments)
+{
+	if(file == "")
+	{
+		std::cerr << "[MidifileInputEngine] Missing midi filename\n";
+		return false;
+	}
+	//if(midimap_filename == "")
+	//{
+	//	std::cerr << "[MidifileInputEngine] Missing midimap filename\n";
+	//	return false;
+	//}
+	smf = smf_load(file.c_str());
+	if(smf == nullptr)
+	{
+		std::cerr << "[MidifileInputEngine] Failed to load midifile '" << file
+		          << "'\n";
+		return false;
+	}
+	//if(!loadMidiMap(midimap_filename, instruments))
+	//{
+	//	std::cerr << "[MidifileInputEngine] Failed to parse midimap '"
+	//	          << midimap_filename << "'\n";
+	//	return false;
+	//}
+
+	return true;
+}
+
+void MidifileInputEngine::setParm(const std::string& parm, const std::string& value)
+{
+	if(parm == "file")
+	{
+		// apply midi input filename
+		file = value;
+	}
+	else if(parm == "speed")
+	{
+		// try to apply speed
+		try
+		{
+			speed = std::stof(value);
+		}
+		catch(...)
+		{
+			std::cerr << "[MidifileInputEngine] Invalid speed " << value
+			          << "\n";
+		}
+	}
+	//else if(parm == "midimap")
+	//{
+	//	// apply midimap filename
+	//	midimap_filename = value;
+	//}
+	else if(parm == "loop")
+	{
+		// apply looping
+		loop = true;
+	}
+	else
+	{
+		std::cerr << "[MidifileInputEngine] Unsupported parameter '" << parm
+		          << "'\n";
+	}
+}
+
+bool MidifileInputEngine::start()
+{
+	return true;
+}
+
+void MidifileInputEngine::stop()
+{
+}
+
+void MidifileInputEngine::pre()
+{
+}
+
+void MidifileInputEngine::run(size_t pos, size_t len, std::vector<event_t>& events)
+{
+	assert(events.empty());
+
+	double current_max_time = (1.0 + pos + len) / (samplerate / speed);
+	current_max_time -= offset;
+
+	if(!current_event)
+	{
+		current_event = smf_get_next_event(smf);
+	}
+
+	while(current_event && current_event->time_seconds < current_max_time)
+	{
+		if(!smf_event_is_metadata(current_event))
+		{
+			if((current_event->midi_buffer_length == 3) &&
+			    ((current_event->midi_buffer[0] & NOTE_ON) == NOTE_ON) &&
+			    (track == -1 || current_event->track_number == track) &&
+			    current_event->midi_buffer[2] > 0)
+			{
+				int key = current_event->midi_buffer[1];
+				int velocity = current_event->midi_buffer[2];
+
+				events.emplace_back();
+				auto& event = events.back();
+				event.type = TYPE_ONSET;
+				size_t evpos = current_event->time_seconds * (samplerate / speed);
+				event.offset = evpos - pos;
+
+				int i = mmap.lookup(key);
+				if(i != -1)
+				{
+					event.instrument = i;
+					event.velocity = velocity / 127.0;
+				}
+			}
+		}
+
+		current_event = smf_get_next_event(smf);
+	}
+
+	if(!current_event)
+	{
+		if(loop)
+		{
+			smf_rewind(smf);
+			offset += current_max_time;
+		}
+		else
+		{
+			assert(len >= 1);
+			events.push_back({TYPE_STOP, 0, len-1, 0.f});
+		}
+	}
+}
+
+void MidifileInputEngine::post()
+{
+}
-- 
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