/*

 *

 *  BlueZ - Bluetooth protocol stack for Linux

 *

 *  Copyright (C) 2015,2016 Felipe F. Tonello <eu@felipetonello.com>

 *  Copyright (C) 2016 ROLI Ltd.

 *

 *  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 St, Fifth Floor, Boston, MA  02110-1301  USA

 *

 *

 */

#ifndef LIBMIDI_H

#define LIBMIDI_H

#include <stdint.h>

#include <stdbool.h>

#include <alsa/asoundlib.h>

#define MIDI_UUID "03B80E5A-EDE8-4B33-A751-6CE34EC4C700"

#define MIDI_IO_UUID "7772E5DB-3868-4112-A1A9-F2669D106BF3"

#define MIDI_MAX_TIMESTAMP 8191

#define MIDI_MSG_MAX_SIZE 12

#define MIDI_SYSEX_MAX_SIZE (4 * 1024)

struct midi_buffer {

	uint8_t *data;

	size_t len;

};

/* MIDI I/O Write parser */

struct midi_write_parser {

	int64_t rtime;                  /* last writer's real time */

	snd_seq_event_type_t rstatus;   /* running status event type */

	struct midi_buffer midi_stream; /* MIDI I/O byte stream */

	size_t stream_size;             /* what is the maximum size of the midi_stream array */

	snd_midi_event_t *midi_ev;      /* midi<->seq event */

};

int midi_write_init(struct midi_write_parser *parser, size_t buffer_size);

static inline void midi_write_free(struct midi_write_parser *parser)

{

	free(parser->midi_stream.data);

	snd_midi_event_free(parser->midi_ev);

}

static inline void midi_write_reset(struct midi_write_parser *parser)

{

	parser->rstatus = SND_SEQ_EVENT_NONE;

	parser->midi_stream.len = 0;

}

static inline bool midi_write_has_data(const struct midi_write_parser *parser)

{

	return parser->midi_stream.len > 0;

}

static inline const uint8_t * midi_write_data(const struct midi_write_parser *parser)

{

	return parser->midi_stream.data;

}

static inline size_t midi_write_data_size(const struct midi_write_parser *parser)

{

	return parser->midi_stream.len;

}

typedef void (*midi_read_ev_cb)(const struct midi_write_parser *parser, void *);

/* It creates BLE-MIDI raw packets from the a sequencer event. If the packet

   is full, then it calls write_cb and resets its internal state as many times

   as necessary.

 */

void midi_read_ev(struct midi_write_parser *parser, const snd_seq_event_t *ev,

                  midi_read_ev_cb write_cb, void *user_data);

/* MIDI I/O Read parser */

struct midi_read_parser {

	uint8_t rstatus;                 /* running status byte */

	int64_t rtime;                   /* last reader's real time */

	int16_t timestamp;               /* last MIDI-BLE timestamp */

	int8_t timestamp_low;            /* MIDI-BLE timestampLow from the current packet */

	int8_t timestamp_high;           /* MIDI-BLE timestampHigh from the current packet */

	struct midi_buffer sysex_stream; /* SysEx stream */

	snd_midi_event_t *midi_ev;       /* midi<->seq event */

};

int midi_read_init(struct midi_read_parser *parser);

static inline void midi_read_free(struct midi_read_parser *parser)

{

	free(parser->sysex_stream.data);

	snd_midi_event_free(parser->midi_ev);

}

static inline void midi_read_reset(struct midi_read_parser *parser)

{

	parser->rstatus = 0;

	parser->timestamp_low = 0;

	parser->timestamp_high = 0;

}

/* Parses raw BLE-MIDI messages and populates a sequencer event representing the

   current MIDI message. It returns how much raw data was processed.

 */

size_t midi_read_raw(struct midi_read_parser *parser, const uint8_t *data,

                     size_t size, snd_seq_event_t *ev /* OUT */);

#endif /* LIBMIDI_H */