1 files changed, 127 insertions, 0 deletions
diff --git a/src/libs/engine/AlsaMidiDriver.h b/src/libs/engine/AlsaMidiDriver.h
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+++ b/src/libs/engine/AlsaMidiDriver.h
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+/* This file is part of Om.  Copyright (C) 2006 Dave Robillard.
+ * 
+ * Om is free software; you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation; either version 2 of the License, or (at your option) any later
+ * version.
+ * 
+ * Om 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 General Public License for details.
+ * 
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#ifndef ALSAMIDIDRIVER_H
+#define ALSAMIDIDRIVER_H
+
+#include <alsa/asoundlib.h>
+#include "List.h"
+#include "util/Queue.h"
+#include "MidiDriver.h"
+
+namespace Om {
+
+class Node;
+class SetPortValueEvent;
+class AlsaMidiDriver;
+template <typename T> class PortBase;
+
+static const int MAX_MIDI_EVENT_SIZE = 3;
+
+
+/** Representation of an ALSA MIDI port.
+ *
+ * \ingroup engine
+ */
+class AlsaMidiPort : public DriverPort, public ListNode<AlsaMidiPort*>
+{
+public:
+	AlsaMidiPort(AlsaMidiDriver* driver, PortBase<MidiMessage>* port);
+	virtual ~AlsaMidiPort();
+
+	void event(snd_seq_event_t* const ev);
+	
+	void prepare_block(const samplecount block_start, const samplecount block_end);
+	
+	void add_to_driver();
+	void remove_from_driver();
+	void set_name(const string& name);
+	
+	int                    port_id()    const { return m_port_id; }
+	PortBase<MidiMessage>* patch_port() const { return m_patch_port; }
+
+private:
+	// Prevent copies (undefined)
+	AlsaMidiPort(const AlsaMidiPort&);
+	AlsaMidiPort& operator=(const AlsaMidiPort&);
+ 
+	AlsaMidiDriver*        m_driver;
+	PortBase<MidiMessage>* m_patch_port;
+	int                    m_port_id;
+	unsigned char**        m_midi_pool; ///< Pool of raw MIDI events for MidiMessage::buffer
+	Queue<snd_seq_event_t> m_events;
+};
+
+
+/** Alsa MIDI driver.
+ *
+ * This driver reads Alsa MIDI events and dispatches them to the appropriate
+ * AlsaMidiPort for processing.
+ *
+ * \ingroup engine
+ */
+class AlsaMidiDriver : public MidiDriver
+{
+public:
+	AlsaMidiDriver();
+	~AlsaMidiDriver();
+
+	void activate();
+	void deactivate();
+	
+	bool is_activated() const { return m_is_activated; }
+	
+	void prepare_block(const samplecount block_start, const samplecount block_end);
+
+	DriverPort* create_port(PortBase<MidiMessage>* patch_port)
+	{ return new AlsaMidiPort(this, patch_port); }
+
+	snd_seq_t*        seq_handle()  const { return m_seq_handle; }
+	snd_midi_event_t* event_coder() const { return m_event_coder; }
+
+private:
+
+	// Prevent copies (undefined)
+	AlsaMidiDriver(const AlsaMidiDriver&);
+	AlsaMidiDriver& operator=(const AlsaMidiDriver&);
+	
+	List<AlsaMidiPort*> m_in_ports;
+	List<AlsaMidiPort*> m_out_ports;
+	
+	friend class AlsaMidiPort;
+	
+	// Functions for AlsaMidiPort
+	void          add_port(AlsaMidiPort* port);
+	AlsaMidiPort* remove_port(AlsaMidiPort* port);
+	
+	void add_output(ListNode<AlsaMidiPort*>* port);
+	ListNode<AlsaMidiPort*>* remove_output(AlsaMidiPort* port);
+	
+	// MIDI thread
+	static void* process_midi_in(void* me);
+
+	snd_seq_t*        m_seq_handle;
+	snd_midi_event_t* m_event_coder;
+	pthread_t         m_process_thread;
+	bool              m_is_activated;
+	static bool       m_midi_thread_exit_flag;
+};
+
+
+} // namespace Om
+
+
+#endif // ALSAMIDIDRIVER_H