example-clients/control.c

   1 /** @file control.c
   2  *
   3  * @brief This simple client demonstrates the basic features of JACK
   4  * as they would be used by many applications.
   5  */
   6
   7 #include <stdio.h>
   8 #include <errno.h>
   9 #include <stdlib.h>
  10 #include <string.h>
  11 #include <signal.h>
  12 #include <math.h>
  13 #include <jack/jack.h>
  14
  15 jack_client_t *client;
  16 static int reorder = 0;
  17
  18 static int Jack_Graph_Order_Callback(void *arg)
  19 {
  20     const char **ports;
  21     int i;
  22
  23     printf("Jack_Graph_Order_Callback count = %d\n", reorder++);
  24
  25     ports = jack_get_ports(client, NULL, NULL, JackPortIsPhysical|JackPortIsOutput);
  26     if (ports) {
  27         for (i = 0;  ports[i]; ++i) {
  28             printf("name: %s\n", ports[i]);
  29         }
  30         jack_free(ports);
  31     }
  32
  33     ports = jack_get_ports(client, NULL, NULL, JackPortIsPhysical|JackPortIsInput);
  34     if (ports) {
  35         for (i = 0;  ports[i]; ++i) {
  36             printf("name: %s\n", ports[i]);
  37         }
  38         jack_free(ports);
  39     }
  40
  41     return 0;
  42 }
  43
  44 int
  45 main (int argc, char *argv[])
  46 {
  47         jack_options_t options = JackNullOption;
  48         jack_status_t status;
  49
  50         /* open a client connection to the JACK server */
  51
  52         client = jack_client_open("control_client", options, &status);
  53         if (client == NULL) {
  54                 printf("jack_client_open() failed \n");
  55                 exit(1);
  56         }
  57
  58         if (jack_set_graph_order_callback(client, Jack_Graph_Order_Callback, 0) != 0) {
  59         printf("Error when calling jack_set_graph_order_callback() !\n");
  60     }
  61
  62         /* Tell the JACK server that we are ready to roll.  Our
  63          * process() callback will start running now. */
  64
  65         if (jack_activate(client)) {
  66                 printf("cannot activate client");
  67                 exit(1);
  68         }
  69
  70     printf("Type 'q' to quit\n");
  71     while ((getchar() != 'q')) {}
  72
  73         jack_client_close(client);
  74         exit (0);
  75 }