port_hash.c

   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 #include <stdbool.h>
  23 #include <semaphore.h>
  24 #include <alsa/asoundlib.h>
  25 #include <jack/jack.h>
  26 #include <jack/ringbuffer.h>
  27
  28 #include "list.h"
  29 #include "structs.h"
  30 #include "port_hash.h"
  31
  32 static inline
  33 int
  34 a2j_port_hash(
  35   snd_seq_addr_t addr)
  36 {
  37   return (addr.client + addr.port) % PORT_HASH_SIZE;
  38 }
  39
  40 struct a2j_port *
  41 a2j_port_get(
  42   a2j_port_hash_t hash,
  43   snd_seq_addr_t addr)
  44 {
  45   struct a2j_port **pport = &hash[a2j_port_hash(addr)];
  46   while (*pport) {
  47     struct a2j_port *port = *pport;
  48     if (port->remote.client == addr.client && port->remote.port == addr.port)
  49       return port;
  50     pport = &port->next;
  51   }
  52   return NULL;
  53 }
  54
  55 void
  56 a2j_port_insert(
  57   a2j_port_hash_t hash,
  58   struct a2j_port * port)
  59 {
  60   struct a2j_port **pport = &hash[a2j_port_hash(port->remote)];
  61   port->next = *pport;
  62   *pport = port;
  63 }