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Diffstat (limited to 'libs/evoral/evoral/EventRingBuffer.hpp')
-rw-r--r-- | libs/evoral/evoral/EventRingBuffer.hpp | 95 |
1 files changed, 95 insertions, 0 deletions
diff --git a/libs/evoral/evoral/EventRingBuffer.hpp b/libs/evoral/evoral/EventRingBuffer.hpp new file mode 100644 index 0000000000..05ec9217b8 --- /dev/null +++ b/libs/evoral/evoral/EventRingBuffer.hpp @@ -0,0 +1,95 @@ +/* This file is part of Evoral. + * Copyright (C) 2008 Dave Robillard <http://drobilla.net> + * + * Evoral 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. + * + * Evoral 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 EVORAL_EVENT_RING_BUFFER_HPP +#define EVORAL_EVENT_RING_BUFFER_HPP + +#include <glib.h> +#include <evoral/RingBuffer.hpp> +#include <evoral/EventSink.hpp> +#include <evoral/types.hpp> + +#include <iostream> +using namespace std; + +namespace Evoral { + + +/** A RingBuffer of events (generic time-stamped binary "blobs"). + * + * This packs a timestamp, size, and size bytes of data flat into the buffer. + * Useful for MIDI events, OSC messages, etc. + */ +class EventRingBuffer : public Evoral::RingBuffer<uint8_t>, public Evoral::EventSink { +public: + + /** @param capacity Ringbuffer capacity in bytes. + */ + EventRingBuffer(size_t capacity) : RingBuffer<uint8_t>(capacity) + {} + + size_t capacity() const { return _size; } + + bool peek_time(EventTime* time); + + uint32_t write(EventTime time, EventType type, uint32_t size, const uint8_t* buf); + bool read (EventTime* time, EventType* type, uint32_t* size, uint8_t* buf); +}; + + +inline bool +EventRingBuffer::peek_time(EventTime* time) +{ + bool success = RingBuffer<uint8_t>::full_peek(sizeof(EventTime), (uint8_t*)time); + return success; +} + + +inline bool +EventRingBuffer::read(EventTime* time, EventType* type, uint32_t* size, uint8_t* buf) +{ + bool success = RingBuffer<uint8_t>::full_read(sizeof(EventTime), (uint8_t*)time); + if (success) + success = RingBuffer<uint8_t>::full_read(sizeof(EventType), (uint8_t*)type); + if (success) + success = RingBuffer<uint8_t>::full_read(sizeof(uint32_t), (uint8_t*)size); + if (success) + success = RingBuffer<uint8_t>::full_read(*size, buf); + + return success; +} + + +inline uint32_t +EventRingBuffer::write(EventTime time, EventType type, uint32_t size, const uint8_t* buf) +{ + if (write_space() < (sizeof(EventTime) + sizeof(EventType) + sizeof(uint32_t) + size)) { + return 0; + } else { + RingBuffer<uint8_t>::write(sizeof(EventTime), (uint8_t*)&time); + RingBuffer<uint8_t>::write(sizeof(EventType), (uint8_t*)&type); + RingBuffer<uint8_t>::write(sizeof(uint32_t), (uint8_t*)&size); + RingBuffer<uint8_t>::write(size, buf); + return size; + } +} + + +} // namespace Evoral + +#endif // EVORAL_EVENT_RING_BUFFER_HPP + |