structs.h

   1 /* -*- Mode: C ; c-basic-offset: 2 -*- */
   2 /*
   3  * ALSA SEQ < - > JACK MIDI bridge
   4  *
   5  * Copyright (c) 2006,2007 Dmitry S. Baikov <c0ff@konstruktiv.org>
   6  * Copyright (c) 2007,2008,2009 Nedko Arnaudov <nedko@arnaudov.name>
   7  *
   8  *  This program is free software; you can redistribute it and/or modify
   9  *  it under the terms of the GNU General Public License as published by
  10  *  the Free Software Foundation; version 2 of the License.
  11  *
  12  *  This program is distributed in the hope that it will be useful,
  13  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  *  GNU General Public License for more details.
  16  *
  17  *  You should have received a copy of the GNU General Public License
  18  *  along with this program; if not, write to the Free Software
  19  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  20  */
  21
  22 #ifndef STRUCTS_H__FD2CC895_411F_4ADE_9200_50FE395EDB72__INCLUDED
  23 #define STRUCTS_H__FD2CC895_411F_4ADE_9200_50FE395EDB72__INCLUDED
  24
  25 #include <semaphore.h>
  26 #include <jack/midiport.h>
  27
  28 #define JACK_INVALID_PORT NULL
  29
  30 #define MAX_PORTS  2048
  31 #define MAX_EVENT_SIZE 1024
  32
  33 #define PORT_HASH_BITS 4
  34 #define PORT_HASH_SIZE (1 << PORT_HASH_BITS)
  35
  36 typedef struct a2j_port * a2j_port_hash_t[PORT_HASH_SIZE];
  37
  38 struct a2j;
  39
  40 struct a2j_port
  41 {
  42   struct a2j_port * next;       /* hash - jack */
  43   struct list_head siblings;    /* list - main loop */
  44   struct a2j * a2j_ptr;
  45   bool is_dead;
  46   snd_seq_addr_t remote;
  47   jack_port_t * jack_port;
  48
  49   jack_ringbuffer_t * inbound_events; // alsa_midi_event_t + data
  50   int64_t last_out_time;
  51
  52   void * jack_buf;
  53   char name[0];
  54 };
  55
  56 struct a2j_stream
  57 {
  58   snd_midi_event_t *codec;
  59
  60   jack_ringbuffer_t *new_ports;
  61
  62   a2j_port_hash_t port_hash;
  63   struct list_head list;
  64 };
  65
  66 struct a2j
  67 {
  68   jack_client_t * jack_client;
  69
  70   snd_seq_t *seq;
  71   pthread_t alsa_input_thread;
  72   pthread_t alsa_output_thread;
  73   int client_id;
  74   int port_id;
  75   int queue;
  76
  77   jack_ringbuffer_t *port_add; // snd_seq_addr_t
  78   jack_ringbuffer_t *port_del; // struct a2j_port*
  79   jack_ringbuffer_t * outbound_events; // struct a2j_delivery_event
  80   jack_nframes_t cycle_start;
  81
  82   sem_t io_semaphore;
  83
  84   struct a2j_stream stream[2];
  85 };
  86
  87 #define NSEC_PER_SEC ((int64_t)1000*1000*1000)
  88
  89 struct a2j_process_info
  90 {
  91   int dir;
  92   jack_nframes_t nframes;
  93   jack_nframes_t period_start;
  94   jack_nframes_t sample_rate;
  95   jack_nframes_t cur_frames;
  96   int64_t alsa_time;
  97 };
  98
  99 struct a2j_alsa_midi_event
 100 {
 101   int64_t time;
 102   int size;
 103 };
 104
 105 #define MAX_JACKMIDI_EV_SIZE 16
 106
 107 struct a2j_delivery_event
 108 {
 109   struct list_head siblings;
 110
 111   /* a jack MIDI event, plus the port its destined for: everything
 112      the ALSA output thread needs to deliver the event. time is
 113      part of the jack_event.
 114   */
 115   jack_midi_event_t jack_event;
 116   jack_nframes_t time; /* realtime, not offset time */
 117   struct a2j_port* port;
 118   char midistring[MAX_JACKMIDI_EV_SIZE];
 119 };
 120
 121 /* Beside enum use, these are indeces for (struct a2j).stream array */
 122 #define A2J_PORT_CAPTURE   0 // ALSA playback port -> JACK capture port
 123 #define A2J_PORT_PLAYBACK  1 // JACK playback port -> ALSA capture port
 124
 125 extern struct a2j * g_a2j;
 126
 127 extern size_t g_max_jack_port_name_size;
 128
 129 #endif /* #ifndef STRUCTS_H__FD2CC895_411F_4ADE_9200_50FE395EDB72__INCLUDED */