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/*
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*
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* BlueZ - Bluetooth protocol stack for Linux
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*
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* Copyright (C) 2015,2016 Felipe F. Tonello <eu@felipetonello.com>
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* Copyright (C) 2016 ROLI Ltd.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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*
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*/
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#ifndef LIBMIDI_H
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#define LIBMIDI_H
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#include <stdint.h>
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#include <stdbool.h>
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#include <alsa/asoundlib.h>
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#define MIDI_UUID "03B80E5A-EDE8-4B33-A751-6CE34EC4C700"
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#define MIDI_IO_UUID "7772E5DB-3868-4112-A1A9-F2669D106BF3"
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#define MIDI_MAX_TIMESTAMP 8191
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#define MIDI_MSG_MAX_SIZE 12
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#define MIDI_SYSEX_MAX_SIZE (4 * 1024)
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struct midi_buffer {
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uint8_t *data;
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size_t len;
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};
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/* MIDI I/O Write parser */
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struct midi_write_parser {
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int64_t rtime; /* last writer's real time */
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snd_seq_event_type_t rstatus; /* running status event type */
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struct midi_buffer midi_stream; /* MIDI I/O byte stream */
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size_t stream_size; /* what is the maximum size of the midi_stream array */
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snd_midi_event_t *midi_ev; /* midi<->seq event */
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};
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int midi_write_init(struct midi_write_parser *parser, size_t buffer_size);
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static inline void midi_write_free(struct midi_write_parser *parser)
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{
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free(parser->midi_stream.data);
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snd_midi_event_free(parser->midi_ev);
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}
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static inline void midi_write_reset(struct midi_write_parser *parser)
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{
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parser->rstatus = SND_SEQ_EVENT_NONE;
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parser->midi_stream.len = 0;
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}
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static inline bool midi_write_has_data(const struct midi_write_parser *parser)
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{
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return parser->midi_stream.len > 0;
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}
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static inline const uint8_t * midi_write_data(const struct midi_write_parser *parser)
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{
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return parser->midi_stream.data;
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}
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static inline size_t midi_write_data_size(const struct midi_write_parser *parser)
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{
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return parser->midi_stream.len;
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}
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typedef void (*midi_read_ev_cb)(const struct midi_write_parser *parser, void *);
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/* It creates BLE-MIDI raw packets from the a sequencer event. If the packet
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is full, then it calls write_cb and resets its internal state as many times
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as necessary.
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*/
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void midi_read_ev(struct midi_write_parser *parser, const snd_seq_event_t *ev,
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midi_read_ev_cb write_cb, void *user_data);
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/* MIDI I/O Read parser */
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struct midi_read_parser {
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uint8_t rstatus; /* running status byte */
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int64_t rtime; /* last reader's real time */
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int16_t timestamp; /* last MIDI-BLE timestamp */
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int8_t timestamp_low; /* MIDI-BLE timestampLow from the current packet */
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int8_t timestamp_high; /* MIDI-BLE timestampHigh from the current packet */
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struct midi_buffer sysex_stream; /* SysEx stream */
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snd_midi_event_t *midi_ev; /* midi<->seq event */
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};
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int midi_read_init(struct midi_read_parser *parser);
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static inline void midi_read_free(struct midi_read_parser *parser)
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{
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free(parser->sysex_stream.data);
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snd_midi_event_free(parser->midi_ev);
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}
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static inline void midi_read_reset(struct midi_read_parser *parser)
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{
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parser->rstatus = 0;
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parser->timestamp_low = 0;
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parser->timestamp_high = 0;
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}
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/* Parses raw BLE-MIDI messages and populates a sequencer event representing the
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current MIDI message. It returns how much raw data was processed.
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*/
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size_t midi_read_raw(struct midi_read_parser *parser, const uint8_t *data,
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size_t size, snd_seq_event_t *ev /* OUT */);
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#endif /* LIBMIDI_H */
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