From d6b87aa26ef482a8952437f7472b81a2240f01fd Mon Sep 17 00:00:00 2001
From: David Robillard <d@drobilla.net>
Date: Mon, 21 Jan 2008 15:14:53 +0000
Subject: Work on generic LV2 events.

git-svn-id: http://svn.drobilla.net/lad/ingen@1090 a436a847-0d15-0410-975c-d299462d15a1
---
 src/libs/engine/EventBuffer.hpp | 97 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 97 insertions(+)
 create mode 100644 src/libs/engine/EventBuffer.hpp

(limited to 'src/libs/engine/EventBuffer.hpp')

diff --git a/src/libs/engine/EventBuffer.hpp b/src/libs/engine/EventBuffer.hpp
new file mode 100644
index 00000000..0f8ce485
--- /dev/null
+++ b/src/libs/engine/EventBuffer.hpp
@@ -0,0 +1,97 @@
+/* This file is part of Ingen.
+ * Copyright (C) 2007 Dave Robillard <http://drobilla.net>
+ * 
+ * Ingen 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.
+ * 
+ * Ingen 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.,
+ * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef EVENTBUFFER_H
+#define EVENTBUFFER_H
+
+#include <iostream>
+#include <lv2ext/lv2_event.h>
+#include "Buffer.hpp"
+#include "interface/DataType.hpp"
+
+namespace Ingen {
+
+
+class EventBuffer : public Buffer {
+public:
+	EventBuffer(size_t capacity);
+	
+	~EventBuffer();
+
+	void prepare_read(SampleCount nframes);
+	void prepare_write(SampleCount nframes);
+
+	bool join(Buffer* buf);
+	void unjoin();
+
+	inline uint32_t this_nframes() const { return _this_nframes; }
+	inline uint32_t event_count() const { return _buf->event_count; }
+	
+	inline void*       raw_data()       { return _buf; }
+	inline const void* raw_data() const { return _buf; }
+
+	inline LV2_Event_Buffer*       local_data() { return _local_buf; }
+	inline const LV2_Event_Buffer* local_data() const { return _local_buf; }
+
+	inline LV2_Event_Buffer*       data()       { return _buf; }
+	inline const LV2_Event_Buffer* data() const { return _buf; }
+	
+	void copy(const Buffer* src, size_t start_sample, size_t end_sample);
+
+	inline void rewind() const { _position = 0; }
+	inline void clear() { reset(_this_nframes); }
+	inline void reset(SampleCount nframes) {
+		//std::cerr << this << " reset" << std::endl;
+		_latest_frames = 0;
+		_latest_subframes = 0;
+		_position = sizeof(LV2_Event_Buffer);
+		_buf->event_count = 0;
+		_buf->size = 0;
+	}
+
+	bool increment() const;
+
+	uint32_t latest_frames()    const { return _latest_frames; }
+	uint32_t latest_subframes() const { return _latest_subframes; }
+ 
+	bool get_event(uint32_t* frames,
+	               uint32_t* subframes,
+	               uint16_t* type,
+	               uint16_t* size,
+	               uint8_t** data) const;
+
+	bool append(uint32_t       frames,
+	            uint32_t       subframes,
+	            uint16_t       type,
+	            uint16_t       size,
+	            const uint8_t* data);
+
+	bool merge(const EventBuffer& a, const EventBuffer& b);
+
+private:
+	uint32_t          _latest_frames;    ///< Latest time of all events (frames)
+	uint32_t          _latest_subframes; ///< Latest time of all events (subframes)
+	uint32_t          _this_nframes;     ///< Current cycle nframes
+	mutable uint32_t  _position;         ///< Offset into _buf
+	LV2_Event_Buffer* _buf;              ///< Contents (maybe belong to _joined_buf)
+	LV2_Event_Buffer* _local_buf;        ///< Local contents
+};
+
+
+} // namespace Ingen
+
+#endif // EVENTBUFFER_H
-- 
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