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27a1cf2cf7
To compile Ardour with LLVM/clang, do the usual thing but set the CXX and CC environment variables, e.g.: CC=/usr/bin/clang CXX=/usr/bin/clang++ ./waf configure build git-svn-id: svn://localhost/ardour2/branches/3.0@12418 d708f5d6-7413-0410-9779-e7cbd77b26cf
134 lines
3.7 KiB
C++
134 lines
3.7 KiB
C++
/* This file is part of Evoral.
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* Copyright (C) 2008 David Robillard <http://drobilla.net>
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*
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* Evoral is free software; you can redistribute it and/or modify it under the
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* terms of the GNU General Public License as published by the Free Software
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* Foundation; either version 2 of the License, or (at your option) any later
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* version.
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*
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* Evoral is distributed in the hope that it will be useful, but WITHOUT ANY
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* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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* FOR A PARTICULAR PURPOSE. See the GNU General Public License for details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef EVORAL_EVENT_RING_BUFFER_HPP
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#define EVORAL_EVENT_RING_BUFFER_HPP
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#include <iostream>
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#include "pbd/ringbufferNPT.h"
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#include "evoral/EventSink.hpp"
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#include "evoral/types.hpp"
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using namespace std;
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namespace Evoral {
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/** A RingBuffer of events (generic time-stamped binary "blobs").
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*
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* This packs a timestamp, size, and size bytes of data flat into the buffer.
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* Useful for MIDI events, OSC messages, etc.
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*
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* Note: the uint8_t template argument to RingBufferNPT<> indicates "byte
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* oriented data", not anything particular linked to MIDI or any other
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* possible interpretation of uint8_t.
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*/
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template<typename Time>
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class EventRingBuffer : public PBD::RingBufferNPT<uint8_t>, public Evoral::EventSink<Time> {
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public:
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/** @param capacity Ringbuffer capacity in bytes.
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*/
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EventRingBuffer(size_t capacity) : PBD::RingBufferNPT<uint8_t>(capacity)
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{}
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inline size_t capacity() const { return bufsize(); }
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/** Peek at the ringbuffer (read w/o advancing read pointer).
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* @return how much has been peeked (wraps around if read exceeds
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* the end of the buffer):
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* <pre>
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* |===========--------------R=============================|
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* read-pointer---^
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* </pre>
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*/
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inline bool peek (uint8_t*, size_t size);
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inline uint32_t write(Time time, EventType type, uint32_t size, const uint8_t* buf);
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inline bool read (Time* time, EventType* type, uint32_t* size, uint8_t* buf);
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};
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template<typename Time>
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inline bool
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EventRingBuffer<Time>::peek (uint8_t* buf, size_t size)
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{
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PBD::RingBufferNPT<uint8_t>::rw_vector vec;
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get_read_vector (&vec);
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if (vec.len[0] + vec.len[1] < size) {
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return false;
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}
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if (vec.len[0] > 0) {
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memcpy (buf, vec.buf[0], min (vec.len[0], size));
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}
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if (vec.len[0] < size) {
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if (vec.len[1]) {
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memcpy (buf + vec.len[0], vec.buf[1], size - vec.len[0]);
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}
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}
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return true;
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}
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template<typename Time>
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inline bool
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EventRingBuffer<Time>::read(Time* time, EventType* type, uint32_t* size, uint8_t* buf)
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{
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if (PBD::RingBufferNPT<uint8_t>::read ((uint8_t*)time, sizeof (Time)) != sizeof (Time)) {
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return false;
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}
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if (PBD::RingBufferNPT<uint8_t>::read ((uint8_t*)type, sizeof(EventType)) != sizeof (EventType)) {
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return false;
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}
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if (PBD::RingBufferNPT<uint8_t>::read ((uint8_t*)size, sizeof(uint32_t)) != sizeof (uint32_t)) {
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return false;
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}
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if (PBD::RingBufferNPT<uint8_t>::read (buf, *size) != *size) {
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return false;
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}
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return true;
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}
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template<typename Time>
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inline uint32_t
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EventRingBuffer<Time>::write(Time time, EventType type, uint32_t size, const uint8_t* buf)
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{
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if (write_space() < (sizeof(Time) + sizeof(EventType) + sizeof(uint32_t) + size)) {
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return 0;
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} else {
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PBD::RingBufferNPT<uint8_t>::write ((uint8_t*)&time, sizeof(Time));
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PBD::RingBufferNPT<uint8_t>::write ((uint8_t*)&type, sizeof(EventType));
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PBD::RingBufferNPT<uint8_t>::write ((uint8_t*)&size, sizeof(uint32_t));
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PBD::RingBufferNPT<uint8_t>::write (buf, size);
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return size;
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}
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}
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} // namespace Evoral
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#endif // EVORAL_EVENT_RING_BUFFER_HPP
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