midi_ring_buffer.h

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/*
 * Copyright (C) 2006-2015 David Robillard <d@drobilla.net>
 * Copyright (C) 2007-2017 Paul Davis <paul@linuxaudiosystems.com>
 * Copyright (C) 2008-2012 Hans Baier <hansfbaier@googlemail.com>
 *
 * This program 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.
 *
 * This program 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 more 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 Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */
 
#pragma once
 
#include <iostream>
#include <algorithm>
 
#include "ardour/event_ring_buffer.h"
#include "ardour/libardour_visibility.h"
#include "ardour/types.h"
#include "ardour/midi_state_tracker.h"
 
namespace ARDOUR {
 
class MidiBuffer;
 
template<typename T>
class /*LIBARDOUR_API*/ MidiRingBuffer : public EventRingBuffer<T> {
public:
        MidiRingBuffer(size_t size) : EventRingBuffer<T>(size) {}
 
        inline bool read_prefix(T* time, Evoral::EventType* type, uint32_t* size);
        inline bool read_contents(uint32_t size, uint8_t* buf);
 
        size_t read(MidiBuffer& dst, samplepos_t start, samplepos_t end, samplecnt_t offset=0, bool stop_on_overflow_in_destination=false);
        size_t skip_to(samplepos_t start);
 
        void dump(std::ostream& dst);
        void flush (samplepos_t start, samplepos_t end);
 
        void reset_tracker ();
        void resolve_tracker (MidiBuffer& dst, samplepos_t);
        void resolve_tracker (Evoral::EventSink<samplepos_t>& dst, samplepos_t);
 
private:
        MidiNoteTracker _tracker;
};
 
 
template<typename T>
inline bool
MidiRingBuffer<T>::read_prefix(T* time, Evoral::EventType* type, uint32_t* size)
{
        if (PBD::RingBufferNPT<uint8_t>::read((uint8_t*)time, sizeof(T)) != sizeof (T)) {
                return false;
        }
 
        if (PBD::RingBufferNPT<uint8_t>::read((uint8_t*)type, sizeof(Evoral::EventType)) != sizeof (Evoral::EventType)) {
                return false;
        }
 
        if (PBD::RingBufferNPT<uint8_t>::read((uint8_t*)size, sizeof(uint32_t)) != sizeof (uint32_t)) {
                return false;
        }
 
        return true;
}
 
 
template<typename T>
inline bool
MidiRingBuffer<T>::read_contents(uint32_t size, uint8_t* buf)
{
        return PBD::RingBufferNPT<uint8_t>::read(buf, size) == size;
}
 
} // namespace ARDOUR