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/*
* Copyright (C) 2014 Robin Gareus <robin@gareus.org>
*
* 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 __libbackend_alsa_midi_h__
#define __libbackend_alsa_midi_h__
#include <stdint.h>
#include <poll.h>
#include <pthread.h>
#include "pbd/ringbuffer.h"
#include "ardour/types.h"
/* max bytes per individual midi-event
* events larger than this are ignored */
#define MaxAlsaMidiEventSize (64)
namespace ARDOUR {
class AlsaMidiIO {
public:
AlsaMidiIO ();
virtual ~AlsaMidiIO ();
int state (void) const { return _state; }
int start ();
int stop ();
void setup_timing (const size_t samples_per_period, const float samplerate);
void sync_time(uint64_t);
virtual void* main_process_thread () = 0;
const std::string & name () const { return _name; }
protected:
pthread_t _main_thread;
pthread_mutex_t _notify_mutex;
pthread_cond_t _notify_ready;
int _state;
bool _running;
int _npfds;
struct pollfd *_pfds;
double _sample_length_us;
double _period_length_us;
size_t _samples_per_period;
uint64_t _clock_monotonic;
struct MidiEventHeader {
uint64_t time;
size_t size;
MidiEventHeader(const uint64_t t, const size_t s)
: time(t)
, size(s) {}
};
RingBuffer<uint8_t>* _rb;
std::string _name;
virtual void init (const char *device_name, const bool input) = 0;
};
class AlsaMidiOut : virtual public AlsaMidiIO
{
public:
AlsaMidiOut ();
int send_event (const pframes_t, const uint8_t *, const size_t);
};
class AlsaMidiIn : virtual public AlsaMidiIO
{
public:
AlsaMidiIn ();
size_t recv_event (pframes_t &, uint8_t *, size_t &);
protected:
int queue_event (const uint64_t, const uint8_t *, const size_t);
};
} // namespace
#endif
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