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/*
Copyright (C) 2006 Paul Davis
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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#ifndef __ardour_midi_ring_buffer_h__
#define __ardour_midi_ring_buffer_h__
#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;
/** A RingBuffer for (MIDI) events.
*
* This is simply a wrapper around a raw ringbuffer which writes/reads events
* as flat placked blobs.
* The buffer looks like this:
*
* [timestamp][type][size][size bytes of raw MIDI][timestamp][type][size](etc...)
*/
template<typename T>
class /*LIBARDOUR_API*/ MidiRingBuffer : public EventRingBuffer<T> {
public:
/** @param size Size in bytes. */
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, framepos_t start, framepos_t end, framecnt_t offset=0, bool stop_on_overflow_in_destination=false);
size_t skip_to(framepos_t start);
void dump(std::ostream& dst);
void flush (framepos_t start, framepos_t end);
void reset_tracker ();
void resolve_tracker (MidiBuffer& dst, framepos_t);
void resolve_tracker (Evoral::EventSink<framepos_t>& dst, framepos_t);
private:
MidiStateTracker _tracker;
};
/** Read the time and size of an event. This call MUST be immediately proceeded
* by a call to read_contents (or the read pointer will be garbage).
*/
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;
}
/** Read the content of an event. This call MUST be immediately preceded
* by a call to read_prefix (or the returned even will be garbage).
*/
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
#endif // __ardour_midi_ring_buffer_h__
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