Add ALSA midi input support.

1 files changed, 57 insertions, 0 deletions

diff --git a/drumgizmo/input/alsamidi.h b/drumgizmo/input/alsamidi.h
new file mode 100644
index 0000000..73e0fc8
--- /dev/null
+++ b/drumgizmo/input/alsamidi.h
@@ -0,0 +1,57 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/***************************************************************************
+ *            alsamidi.h
+ *
+ *  Copyright 2021 Volker Fischer (github.com/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.
+ */
+#pragma once
+#include <memory>
+#include <alsa/asoundlib.h>
+
+#include "audioinputenginemidi.h"
+#include "midimapper.h"
+#include "midimapparser.h"
+
+class AlsaMidiInputEngine
+	: public AudioInputEngineMidi
+{
+public:
+	AlsaMidiInputEngine();
+	~AlsaMidiInputEngine();
+
+	// based on AudioInputEngineMidi
+	bool init(const Instruments& instruments) override;
+	void setParm(const std::string& parm, const std::string& value) override;
+	bool start() override;
+	void stop() override;
+	void pre() override;
+	void run(size_t pos, size_t len, std::vector<event_t>& events) override;
+	void post() override;
+	bool isFreewheeling() const override;
+
+private:
+	int in_port;
+	snd_seq_t* seq_handle;
+
+	std::string midimap_file;
+	std::size_t pos;
+	std::vector<event_t> events;
+};