structs.h

/* -*- Mode: C ; c-basic-offset: 2 -*- */
/*
 * ALSA SEQ < - > JACK MIDI bridge
 *
 * Copyright (c) 2006,2007 Dmitry S. Baikov <c0ff@konstruktiv.org>
 * Copyright (c) 2007,2008,2009 Nedko Arnaudov <nedko@arnaudov.name>
 *
 *  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; version 2 of the License.
 *
 *  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., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 */

#ifndef STRUCTS_H__FD2CC895_411F_4ADE_9200_50FE395EDB72__INCLUDED
#define STRUCTS_H__FD2CC895_411F_4ADE_9200_50FE395EDB72__INCLUDED

#include <semaphore.h>
#include <jack/midiport.h>

#define JACK_INVALID_PORT NULL

#define MAX_PORTS  2048
#define MAX_EVENT_SIZE 1024

#define PORT_HASH_BITS 4
#define PORT_HASH_SIZE (1 << PORT_HASH_BITS)

typedef struct a2j_port * a2j_port_hash_t[PORT_HASH_SIZE];

struct a2j;

struct a2j_port
{
  struct a2j_port * next;       /* hash - jack */
  struct list_head siblings;    /* list - main loop */
  struct a2j * a2j_ptr;
  bool is_dead;
  snd_seq_addr_t remote;
  jack_port_t * jack_port;

  jack_ringbuffer_t * inbound_events; // alsa_midi_event_t + data
  int64_t last_out_time;

  void * jack_buf;
  char name[0];
};

struct a2j_stream
{
  snd_midi_event_t *codec;

  jack_ringbuffer_t *new_ports;

  a2j_port_hash_t port_hash;
  struct list_head list;
};

struct a2j
{
  jack_client_t * jack_client;

  snd_seq_t *seq;
  pthread_t alsa_input_thread;
  pthread_t alsa_output_thread;
  int client_id;
  int port_id;
  int queue;
    
  jack_ringbuffer_t *port_add; // snd_seq_addr_t
  jack_ringbuffer_t *port_del; // struct a2j_port*
  jack_ringbuffer_t * outbound_events; // struct a2j_delivery_event
  jack_nframes_t cycle_start;

  sem_t io_semaphore;

  struct a2j_stream stream[2];
};

#define NSEC_PER_SEC ((int64_t)1000*1000*1000)

struct a2j_process_info
{
  int dir;
  jack_nframes_t nframes;
  jack_nframes_t period_start;
  jack_nframes_t sample_rate;
  jack_nframes_t cur_frames;
  int64_t alsa_time;
};

struct a2j_alsa_midi_event
{
  int64_t time;
  int size;
};

#define MAX_JACKMIDI_EV_SIZE 16

struct a2j_delivery_event 
{
  struct list_head siblings;

  /* a jack MIDI event, plus the port its destined for: everything
     the ALSA output thread needs to deliver the event. time is
     part of the jack_event.
  */
  jack_midi_event_t jack_event;
  jack_nframes_t time; /* realtime, not offset time */
  struct a2j_port* port;
  char midistring[MAX_JACKMIDI_EV_SIZE];
};

/* Beside enum use, these are indeces for (struct a2j).stream array */
#define A2J_PORT_CAPTURE   0 // ALSA playback port -> JACK capture port
#define A2J_PORT_PLAYBACK  1 // JACK playback port -> ALSA capture port

extern struct a2j * g_a2j;

extern size_t g_max_jack_port_name_size;

#endif /* #ifndef STRUCTS_H__FD2CC895_411F_4ADE_9200_50FE395EDB72__INCLUDED */