tools/jacktest.c

   1 #include <stdio.h>
   2 #include <errno.h>
   3 #include <unistd.h>
   4 #include <stdlib.h>
   5 #include <string.h>
   6
   7 #include <jack/jack.h>
   8
   9 jack_port_t *input_port;
  10 jack_port_t *output_port;
  11 jack_client_t *client;
  12 int loopsize = 25000;
  13 int xrun_occured = 0;
  14 int consecutive_xruns = 0;
  15 float first_xrun = 0.0f;
  16 float last_load = 0.0f;
  17 int at_loop = 0;
  18 int at_loop_size;
  19 char *thechunk;
  20 int chunksize = 1024 * 1024 * 10;
  21
  22 void
  23 fooey (jack_nframes_t n)
  24 {
  25         volatile int x;
  26         thechunk[random()%chunksize] = n;
  27 }
  28
  29 int
  30 process (jack_nframes_t nframes, void *arg)
  31 {
  32         jack_default_audio_sample_t *in, *out;
  33         int i;
  34
  35         in = jack_port_get_buffer (input_port, nframes);
  36         out = jack_port_get_buffer (output_port, nframes);
  37
  38         memcpy (out, in, sizeof (jack_default_audio_sample_t) * nframes);
  39
  40         for (i = 0; i < loopsize; ++i) {
  41                 fooey (nframes);
  42         }
  43
  44         last_load = jack_cpu_load (client);
  45
  46         if ((at_loop += nframes) >= at_loop_size) {
  47                 if (last_load < 25.0f) {
  48                         loopsize *= 2;
  49                 } else if (last_load < 50.0f) {
  50                         loopsize = (int) (1.5 * loopsize);
  51                 } else if (last_load < 90.0f) {
  52                         loopsize += (int) (0.10 * loopsize);
  53                 } else if (last_load < 95.0f) {
  54                         loopsize += (int) (0.05 * loopsize);
  55                 } else {
  56                         loopsize += (int) (0.001 * loopsize);
  57                 }
  58                 at_loop = 0;
  59                 printf ("loopsize = %d\n", loopsize);
  60         }
  61
  62         if (xrun_occured) {
  63                 if (consecutive_xruns == 0) {
  64                         first_xrun = last_load;
  65                 }
  66                 consecutive_xruns++;
  67         }
  68
  69         xrun_occured = 0;
  70
  71         if (consecutive_xruns >= 10) {
  72                 fprintf (stderr, "Stopping with load = %f (first xrun at %f)\n", last_load, first_xrun);
  73                 exit (0);
  74         }
  75
  76         return 0;
  77 }
  78
  79 /**
  80  * JACK calls this shutdown_callback if the server ever shuts down or
  81  * decides to disconnect the client.
  82  */
  83 void
  84 jack_shutdown (void *arg)
  85 {
  86         fprintf (stderr, "shutdown with load = %f\n", last_load);
  87         exit (1);
  88 }
  89
  90 int
  91 jack_xrun (void *arg)
  92 {
  93         fprintf (stderr, "xrun occured with loop size = %d\n", loopsize);
  94         xrun_occured = 1;
  95         return 0;
  96 }
  97
  98 int
  99 main (int argc, char *argv[])
 100 {
 101         const char **ports;
 102         const char *client_name;
 103         const char *server_name = NULL;
 104         jack_options_t options = JackNullOption;
 105         jack_status_t status;
 106
 107         client_name = "jacktester";
 108         if (argc > 1) {
 109                 chunksize = atoi (argv[1]);
 110                 printf ("using chunksize of %d\n", chunksize);
 111         }
 112
 113         /* open a client connection to the JACK server */
 114
 115         client = jack_client_open (client_name, options, &status, server_name);
 116         if (client == NULL) {
 117                 fprintf (stderr, "jack_client_open() failed, status = 0x%x\n",
 118                          status);
 119                 if (status & JackServerFailed) {
 120                         fprintf (stderr, "Unable to connect to JACK server\n");
 121                 }
 122                 exit (1);
 123         }
 124         if (status & JackServerStarted) {
 125                 fprintf (stderr, "JACK server started\n");
 126         }
 127         if (status & JackNameNotUnique) {
 128                 client_name = jack_get_client_name(client);
 129                 fprintf (stderr, "unique name `%s' assigned\n", client_name);
 130         }
 131
 132         /* tell the JACK server to call `process()' whenever
 133            there is work to be done.
 134         */
 135
 136         jack_set_process_callback (client, process, 0);
 137         jack_set_xrun_callback (client, jack_xrun, 0);
 138         jack_on_shutdown (client, jack_shutdown, 0);
 139
 140         /* create two ports */
 141
 142         input_port = jack_port_register (client, "input",
 143                                          JACK_DEFAULT_AUDIO_TYPE,
 144                                          JackPortIsInput, 0);
 145         output_port = jack_port_register (client, "output",
 146                                           JACK_DEFAULT_AUDIO_TYPE,
 147                                           JackPortIsOutput, 0);
 148
 149         if ((input_port == NULL) || (output_port == NULL)) {
 150                 fprintf(stderr, "no more JACK ports available\n");
 151                 exit (1);
 152         }
 153
 154         at_loop_size = jack_get_sample_rate (client) * 2;
 155         if ((thechunk = (char *) malloc (chunksize)) == NULL) {
 156                 fprintf (stderr, "cannot allocate chunk\n");
 157                 exit (1);
 158         }
 159
 160         /* Tell the JACK server that we are ready to roll.  Our
 161          * process() callback will start running now. */
 162
 163         if (jack_activate (client)) {
 164                 fprintf (stderr, "cannot activate client");
 165                 exit (1);
 166         }
 167
 168         /* connect the ports. Note: you can't do this before the
 169            client is activated, because we can't allow connections to
 170            be made to clients that aren't running.
 171         */
 172
 173         ports = jack_get_ports (client, NULL, NULL,
 174                                 JackPortIsPhysical|JackPortIsOutput);
 175         if (ports == NULL) {
 176                 fprintf(stderr, "no physical capture ports\n");
 177                 exit (1);
 178         }
 179
 180         if (jack_connect (client, ports[0], jack_port_name (input_port))) {
 181                 fprintf (stderr, "cannot connect input ports\n");
 182         }
 183
 184         free (ports);
 185
 186         ports = jack_get_ports (client, NULL, NULL,
 187                                 JackPortIsPhysical|JackPortIsInput);
 188         if (ports == NULL) {
 189                 fprintf(stderr, "no physical playback ports\n");
 190                 exit (1);
 191         }
 192
 193         if (jack_connect (client, jack_port_name (output_port), ports[0])) {
 194                 fprintf (stderr, "cannot connect output ports\n");
 195         }
 196
 197         free (ports);
 198
 199         while (1) {
 200                 sleep (1);
 201         }
 202
 203         jack_client_close (client);
 204         exit (0);
 205 }