example-clients/evmon.c

   1 /*
   2     Copyright (C) 2007 Paul Davis
   3
   4     This program is free software; you can redistribute it and/or modify
   5     it under the terms of the GNU General Public License as published by
   6     the Free Software Foundation; either version 2 of the License, or
   7     (at your option) any later version.
   8
   9     This program is distributed in the hope that it will be useful,
  10     but WITHOUT ANY WARRANTY; without even the implied warranty of
  11     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12     GNU General Public License for more details.
  13
  14     You should have received a copy of the GNU General Public License
  15     along with this program; if not, write to the Free Software
  16     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  17 */
  18
  19 #include <stdio.h>
  20 #include <errno.h>
  21 #ifndef WIN32
  22 #include <unistd.h>
  23 #endif
  24 #include <string.h>
  25 #include <signal.h>
  26 #include <stdlib.h>
  27
  28 #include <jack/jack.h>
  29 #include <jack/metadata.h>
  30 #include <jack/uuid.h>
  31
  32 jack_client_t *client;
  33
  34 static void signal_handler(int sig)
  35 {
  36         jack_client_close(client);
  37         fprintf(stderr, "signal received, exiting ...\n");
  38         exit(0);
  39 }
  40
  41 static void
  42 port_rename_callback (jack_port_id_t port, const char* old_name, const char* new_name, void* arg)
  43 {
  44         printf ("Port %d renamed from %s to %s\n", port, old_name, new_name);
  45 }
  46
  47 static void
  48 port_callback (jack_port_id_t port, int yn, void* arg)
  49 {
  50         printf ("Port %d %s\n", port, (yn ? "registered" : "unregistered"));
  51 }
  52
  53 static void
  54 connect_callback (jack_port_id_t a, jack_port_id_t b, int yn, void* arg)
  55 {
  56         printf ("Ports %d and %d %s\n", a, b, (yn ? "connected" : "disconnected"));
  57 }
  58
  59 static void
  60 client_callback (const char* client, int yn, void* arg)
  61 {
  62         printf ("Client %s %s\n", client, (yn ? "registered" : "unregistered"));
  63 }
  64
  65 static int
  66 graph_callback (void* arg)
  67 {
  68         printf ("Graph reordered\n");
  69         return 0;
  70 }
  71
  72 void
  73 propchange (jack_uuid_t subject, const char* key, jack_property_change_t change)
  74 {
  75         char buf[JACK_UUID_STRING_SIZE];
  76         const char* action = "";
  77
  78         switch (change) {
  79         case PropertyCreated:
  80                 action = "created";
  81                 break;
  82
  83         case PropertyChanged:
  84                 action = "changed";
  85                 break;
  86
  87         case PropertyDeleted:
  88                 action = "deleted";
  89                 break;
  90         }
  91
  92         if (jack_uuid_empty (subject)) {
  93                 printf ("All properties changed!\n");
  94         } else {
  95                 jack_uuid_unparse (subject, buf);
  96
  97                 if (key) {
  98                         printf ("key [%s] for %s %s\n", key, buf, action);
  99                 } else {
 100                         printf ("all keys for %s %s\n", buf, action);
 101                 }
 102         }
 103 }
 104
 105 int
 106 main (int argc, char *argv[])
 107 {
 108         jack_options_t options = JackNullOption;
 109         jack_status_t status;
 110
 111         if ((client = jack_client_open ("event-monitor", options, &status, NULL)) == 0) {
 112                 fprintf (stderr, "jack_client_open() failed, "
 113                          "status = 0x%2.0x\n", status);
 114                 if (status & JackServerFailed) {
 115                         fprintf (stderr, "Unable to connect to JACK server\n");
 116                 }
 117                 return 1;
 118         }
 119
 120         if (jack_set_port_registration_callback (client, port_callback, NULL)) {
 121                 fprintf (stderr, "cannot set port registration callback\n");
 122                 return 1;
 123         }
 124         if (jack_set_port_rename_callback (client, port_rename_callback, NULL)) {
 125                 fprintf (stderr, "cannot set port registration callback\n");
 126                 return 1;
 127         }
 128         if (jack_set_port_connect_callback (client, connect_callback, NULL)) {
 129                 fprintf (stderr, "cannot set port connect callback\n");
 130                 return 1;
 131         }
 132         if (jack_set_client_registration_callback (client, client_callback, NULL)) {
 133                 fprintf (stderr, "cannot set client registration callback\n");
 134                 return 1;
 135         }
 136         if (jack_set_graph_order_callback (client, graph_callback, NULL)) {
 137                 fprintf (stderr, "cannot set graph order registration callback\n");
 138                 return 1;
 139         }
 140         if (jack_set_property_change_callback (client, (JackPropertyChangeCallback) propchange, 0)) {
 141                 fprintf (stderr, "cannot set property change callback\n");
 142                 return 1;
 143         }
 144         if (jack_activate (client)) {
 145                 fprintf (stderr, "cannot activate client");
 146                 return 1;
 147         }
 148
 149 #ifndef WIN32
 150         signal(SIGINT, signal_handler);
 151         signal(SIGQUIT, signal_handler);
 152         signal(SIGHUP, signal_handler);
 153 #endif
 154         signal(SIGABRT, signal_handler);
 155         signal(SIGTERM, signal_handler);
 156
 157 #ifdef WIN32
 158         Sleep(INFINITE);
 159 #else
 160         sleep (-1);
 161 #endif
 162         exit (0);
 163 }
 164