tests/cpu.c

   1 /*
   2     Copyright (C) 2005 Samuel TRACOL
   3     Copyright (C) 2008 Grame
   4
   5     This program is free software; you can redistribute it and/or modify
   6     it under the terms of the GNU General Public License as published by
   7     the Free Software Foundation; either version 2 of the License, or
   8     (at your option) any later version.
   9
  10     This program is distributed in the hope that it will be useful,
  11     but WITHOUT ANY WARRANTY; without even the implied warranty of
  12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13     GNU General Public License for more details.
  14
  15     You should have received a copy of the GNU General Public License
  16     along with this program; if not, write to the Free Software
  17     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  18
  19 */
  20
  21 /** @file jack_cpu.c
  22  *
  23  * @brief This client test the capacity for jackd to kick out a to heavy cpu client.
  24  *
  25  */
  26
  27 #include <stdio.h>
  28 #include <errno.h>
  29 #include <unistd.h>
  30 #include <stdlib.h>
  31 #include <string.h>
  32 #include <getopt.h>
  33 #include <jack/jack.h>
  34
  35 jack_port_t *input_port;
  36 jack_port_t *output_port;
  37 jack_client_t *client;
  38 unsigned long sr;
  39 jack_nframes_t idle_time = 0;
  40 int percent_cpu = 0;
  41 int time_to_run = 0;
  42 int time_before_run = 0;
  43 int time_before_exit = 1;
  44 jack_nframes_t cur_buffer_size;
  45
  46 /* a simple state machine for this client */
  47 volatile enum {
  48         Init,
  49         Run,
  50         Exit
  51 } client_state = Init;
  52
  53 void usage()
  54 {
  55         fprintf (stderr, "\n"
  56                                         "usage: jack_cpu \n"
  57                                         "              [ --name OR -n client_name ]\n"
  58                                         "              [ --time OR -t time_to_run (in seconds) ]\n"
  59                                         "              [ --delay OR -d delay_before_cpuload__is_applied (in seconds) ]\n"
  60                                         "                --cpu OR -c percent_cpu_load (1-99)\n"
  61         );
  62 }
  63
  64 int update_buffer_size(jack_nframes_t nframes, void *arg)
  65 {
  66         cur_buffer_size = nframes;
  67         printf("Buffer size = %d \n", cur_buffer_size);
  68         idle_time = (jack_nframes_t) (cur_buffer_size * percent_cpu / 100);
  69         printf("CPU load applies as %d sample delay.\n", idle_time);
  70         return 0;
  71 }
  72
  73 /**
  74  * The process callback for this JACK application is called in a
  75  * special realtime thread once for each audio cycle.
  76  *
  77  */
  78
  79 int process(jack_nframes_t nframes, void *arg)
  80 {
  81         jack_default_audio_sample_t *in, *out;
  82         jack_nframes_t start_frame = jack_frame_time(client);
  83
  84         in = (jack_default_audio_sample_t *) jack_port_get_buffer (input_port, nframes);
  85         out = (jack_default_audio_sample_t *) jack_port_get_buffer (output_port, nframes);
  86         memset(out, 0, sizeof (jack_default_audio_sample_t) * nframes);
  87
  88         while ((client_state == Run) && (jack_frame_time(client) < (start_frame + idle_time))) {}
  89         return 0;
  90 }
  91
  92 /**
  93  * JACK calls this shutdown_callback if the server ever shuts down or
  94  * decides to disconnect the client.
  95  */
  96
  97 void jack_shutdown(void *arg)
  98 {
  99         fprintf(stderr, "JACK shut down, exiting ...\n");
 100         exit (1);
 101 }
 102
 103 int main(int argc, char *argv[])
 104 {
 105         const char **ports;
 106         const char *client_name;
 107         int got_time = 0;
 108     jack_status_t status;
 109
 110         int option_index;
 111         int opt;
 112         const char *options = "t:t:d:c:";
 113         struct option long_options[] =
 114         {
 115                 {"time", 1, 0, 't'},
 116                 {"name", 1, 0, 'n'},
 117                 {"delay", 1, 0, 'd'},
 118                 {"cpu", 1, 0, 'c'},
 119                 {0, 0, 0, 0}
 120         };
 121
 122         client_name = "jack-cpu";
 123         while ((opt = getopt_long (argc, argv, options, long_options, &option_index)) != EOF) {
 124                 switch (opt) {
 125                         case 'n':
 126                                 client_name = optarg;
 127                                 break;
 128                         case 't':
 129                                 time_to_run = atoi(optarg);
 130                                 break;
 131                         case 'd':
 132                                 time_before_run = atoi(optarg);
 133                                 break;
 134                         case 'c':
 135                                 percent_cpu = atoi(optarg);
 136                                 got_time = 1;
 137                                 break;
 138                         default:
 139                                 fprintf(stderr, "unknown option %c\n", opt);
 140                                 usage();
 141                 }
 142         }
 143
 144         if (!got_time) {
 145                 fprintf(stderr, "CPU load not specified ! See usage as following :\n");
 146                 usage();
 147                 return -1;
 148         }
 149
 150         if (time_to_run != 0)
 151                 printf("Running jack-cpu for %d seconds...\n", time_to_run);
 152
 153         /* open a client connection to the JACK server */
 154
 155         client = jack_client_open (client_name, JackNoStartServer, &status);
 156
 157         if (client == NULL) {
 158                 fprintf(stderr, "jack_client_open() failed : is jack server running ?\n");
 159                 exit(1);
 160         }
 161
 162     cur_buffer_size = jack_get_buffer_size(client);
 163         printf("engine buffer size = %d \n", cur_buffer_size);
 164     printf("engine sample rate: %d Hz\n", jack_get_sample_rate(client));
 165         idle_time = (jack_nframes_t) (cur_buffer_size * percent_cpu / 100);
 166         printf("CPU load applies as %d sample delay.\n", idle_time);
 167
 168         /* tell the JACK server to call `process()' whenever
 169            there is work to be done.
 170         */
 171
 172         jack_set_process_callback(client, process, 0);
 173
 174         /* tell the JACK server to call `jack_shutdown()' if
 175            it ever shuts down, either entirely, or if it
 176            just decides to stop calling us.
 177         */
 178
 179         jack_on_shutdown(client, jack_shutdown, 0);
 180
 181         /* create two ports */
 182
 183         input_port = jack_port_register (client, "input", JACK_DEFAULT_AUDIO_TYPE, JackPortIsInput, 0);
 184         output_port = jack_port_register (client, "output", JACK_DEFAULT_AUDIO_TYPE, JackPortIsOutput, 0);
 185
 186         printf("registering ports...\n");
 187         if ((input_port == NULL) || (output_port == NULL)) {
 188                 fprintf(stderr, "no more JACK ports available\n");
 189                 exit(1);
 190         }
 191
 192         if (jack_set_buffer_size_callback(client, update_buffer_size, 0) != 0) {
 193                 printf("Error when calling buffer_size_callback !");
 194                 return -1;
 195         }
 196
 197         /* Tell the JACK server that we are ready to roll.  Our
 198          * process() callback will start running now. */
 199
 200         printf("Activating as jackd client...\n");
 201         if (jack_activate(client)) {
 202                 fprintf(stderr, "cannot activate client");
 203                 exit(1);
 204         }
 205
 206         /* Connect the ports.  You can't do this before the client is
 207          * activated, because we can't make connections to clients
 208          * that aren't running.  Note the confusing (but necessary)
 209          * orientation of the driver backend ports: playback ports are
 210          * "input" to the backend, and capture ports are "output" from
 211          * it.
 212          */
 213
 214         ports = jack_get_ports (client, NULL, NULL, JackPortIsPhysical|JackPortIsOutput);
 215         if (ports == NULL) {
 216                 fprintf(stderr, "no physical capture ports\n");
 217                 exit (1);
 218         }
 219
 220         if (jack_connect(client, ports[0], jack_port_name(input_port))) {
 221                 fprintf (stderr, "cannot connect input ports\n");
 222         }
 223         jack_free(ports);
 224
 225         ports = jack_get_ports (client, NULL, NULL, JackPortIsPhysical|JackPortIsInput);
 226         if (ports == NULL) {
 227                 fprintf(stderr, "no physical playback ports\n");
 228                 exit(1);
 229         }
 230
 231         if (jack_connect(client, jack_port_name (output_port), ports[0])) {
 232                 fprintf(stderr, "cannot connect output ports\n");
 233         }
 234         jack_free(ports);
 235
 236         if (time_before_run == 0) {
 237                 client_state = Run;
 238                 printf("Activating cpu load...\n");
 239         }
 240
 241         if (time_to_run !=0)
 242                 time_before_exit = time_to_run + time_before_run;
 243
 244         while (client_state != Exit) {
 245                 if ((time_before_run > 0) && (client_state == Init))
 246                         time_before_run--;
 247                 sleep(1);
 248                 if ((time_before_run < 1) && (client_state != Run)) {
 249                         client_state = Run;
 250                         printf("Activating cpu load...\n");
 251                 }
 252                 if (time_to_run != 0)
 253                         time_before_exit--;
 254                 if (time_before_exit < 1)
 255                         client_state = Exit;
 256         }
 257         jack_client_close(client);
 258         printf("Exiting after a %d seconds run.\n", time_to_run);
 259         exit(0);
 260 }