From 172cc05cb1f3d2b69b15cfe94c792e042a41b274 Mon Sep 17 00:00:00 2001
From: Volker Fischer <corrados>
Date: Tue, 2 Feb 2021 19:14:09 +0100
Subject: Add alsamidi iput engine.

---
 drumgizmo/input/alsamidi.cc | 111 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 111 insertions(+)
 create mode 100644 drumgizmo/input/alsamidi.cc

(limited to 'drumgizmo/input/alsamidi.cc')

diff --git a/drumgizmo/input/alsamidi.cc b/drumgizmo/input/alsamidi.cc
new file mode 100644
index 0000000..3547563
--- /dev/null
+++ b/drumgizmo/input/alsamidi.cc
@@ -0,0 +1,111 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/***************************************************************************
+ *            alsamidi.cc
+ *
+ *  Copyright 2021 corrados
+ ****************************************************************************/
+
+/*
+ *  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 <iostream>
+#include <cassert>
+
+#include "cpp11fix.h" // required for c++11
+#include "alsamidi.h"
+
+AlsaMidiInputEngine::AlsaMidiInputEngine()
+	: AudioInputEngineMidi{}
+	, in_port(0)
+	, seq_handle{nullptr}
+	, pos{0u}
+	, events{}
+{
+}
+
+AlsaMidiInputEngine::~AlsaMidiInputEngine()
+{
+}
+
+bool AlsaMidiInputEngine::init(const Instruments& instruments)
+{
+	if(!loadMidiMap(midimap_file, instruments))
+	{
+		std::cerr << "[MidifileInputEngine] Failed to parse midimap '"
+		          << midimap_file << "'\n";
+		return false;
+	}
+
+	snd_seq_open(&seq_handle, "default", SND_SEQ_OPEN_INPUT, 0);
+
+	snd_seq_set_client_name(seq_handle, "Midi Listener");
+
+	in_port =
+		snd_seq_create_simple_port(seq_handle, "listen:in",
+		                           SND_SEQ_PORT_CAP_WRITE |
+		                           SND_SEQ_PORT_CAP_SUBS_WRITE,
+		                           SND_SEQ_PORT_TYPE_APPLICATION);
+
+	return true;
+}
+
+void AlsaMidiInputEngine::setParm(const std::string& parm, const std::string& value)
+{
+	if(parm == "midimap")
+	{
+		// apply midimap filename
+		midimap_file = value;
+	}
+	else
+	{
+		std::cerr << "[AlsaMidiInputEngine] Unsupported parameter '" << parm
+		          << "'\n";
+	}
+}
+
+bool AlsaMidiInputEngine::start()
+{
+	return true;
+}
+
+void AlsaMidiInputEngine::stop()
+{
+}
+
+void AlsaMidiInputEngine::pre()
+{
+}
+
+void AlsaMidiInputEngine::run(size_t pos, size_t len,
+                              std::vector<event_t>& events)
+{
+	assert(events.empty());
+
+	snd_seq_event_t* ev = nullptr;
+	snd_seq_event_input(seq_handle, &ev);
+
+	processNote(ev->data.raw8.d, 12, ev->data.time.tick, events);
+}
+
+void AlsaMidiInputEngine::post()
+{
+}
+
+bool AlsaMidiInputEngine::isFreewheeling() const
+{
+	return true;
+}
-- 
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