coremidi_io.h

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/*
 * Copyright (C) 2015-2017 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.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */
 
#ifndef __libbackend_coremidi_io_h__
#define __libbackend_coremidi_io_h__
 
#include <CoreServices/CoreServices.h>
#include <CoreAudio/CoreAudio.h>
#include <AudioUnit/AudioUnit.h>
 
#include <AudioUnit/AudioUnit.h>
#include <AudioToolbox/AudioToolbox.h>
 
#include <map>
#include <memory>
#include <vector>
#include <string>
 
#include "pbd/ringbuffer.h"
 
namespace ARDOUR {
 
typedef struct _CoreMIDIPacket {
        MIDITimeStamp timeStamp;
        UInt16 length;
        Byte data[1024];
#if 0 // unused
        _CoreMIDIPacket (MIDITimeStamp t, Byte *d, UInt16 l)
                : timeStamp(t)
                , length (l)
        {
                if (l > 256) {
                        length = 256;
                }
                if (length > 0) {
                        memcpy(data, d, length);
                }
        }
#endif
        _CoreMIDIPacket (const MIDIPacket *other)
                : timeStamp(other->timeStamp)
                , length (other->length)
        {
                assert (length <= 1024);
                if (length > 0) {
                        memcpy(data, other->data, length);
                }
        }
} CoreMIDIPacket;
 
typedef std::vector<std::shared_ptr<CoreMIDIPacket> > CoreMIDIQueue;
 
class CoreMidiIo {
public:
        CoreMidiIo (void);
        ~CoreMidiIo (void);
 
        void start ();
        void stop ();
 
        void start_cycle (MIDITimeStamp, double cycle_ns);
 
        int send_event (uint32_t, double, const uint8_t *, const size_t);
        size_t recv_event (uint32_t, uint64_t &, uint8_t *, size_t &);
 
        uint32_t n_midi_inputs (void) const { return _n_midi_in; }
        uint32_t n_midi_outputs (void) const { return _n_midi_out; }
        std::string port_id (uint32_t, bool input);
        std::string port_name (uint32_t, bool input);
 
        void notify_proc (const MIDINotification *message);
 
        void set_enabled (bool yn = true) { _enabled = yn; }
        bool enabled (void) const { return _active && _enabled; }
 
        void set_port_changed_callback (void (changed_callback (void*)), void *arg) {
                _changed_callback = changed_callback;
                _changed_arg = arg;
        }
 
private:
        void discover ();
        void cleanup ();
 
        MIDIClientRef     _midi_client;
        MIDIEndpointRef * _input_endpoints;
        MIDIEndpointRef * _output_endpoints;
        MIDIPortRef     * _input_ports;
        MIDIPortRef     * _output_ports;
        CoreMIDIQueue   * _input_queue;
 
        PBD::RingBuffer<uint8_t> ** _rb;
 
        uint32_t          _n_midi_in;
        uint32_t          _n_midi_out;
 
        MIDITimeStamp     _send_start;
        MIDITimeStamp     _recv_start;
        MIDITimeStamp     _recv_end;
        bool              _active; // internal deactivate during discovery etc
        bool              _enabled; // temporary disable, e.g. during freewheeli
        bool              _run; // general status
 
        void (* _changed_callback) (void*);
        void  * _changed_arg;
 
        pthread_mutex_t _discovery_lock;
};
 
} // namespace
 
#endif /* __libbackend_coremidi_io */