test/timer.c

   1 #include <stdio.h>
   2 #include <stdlib.h>
   3 #include <string.h>
   4 #include <sys/time.h>
   5 #include "../include/asoundlib.h"
   6
   7 void show_status(void *handle)
   8 {
   9         int err;
  10         snd_timer_status_t *status;
  11
  12         snd_timer_status_alloca(&status);
  13         if ((err = snd_timer_status(handle, status)) < 0) {
  14                 fprintf(stderr, "timer status %i (%s)\n", err, snd_strerror(err));
  15                 return;
  16         }
  17         printf("STATUS:\n");
  18         printf("  resolution = %li\n", snd_timer_status_get_resolution(status));
  19         printf("  lost = %li\n", snd_timer_status_get_lost(status));
  20         printf("  overrun = %li\n", snd_timer_status_get_overrun(status));
  21         printf("  queue = %li\n", snd_timer_status_get_queue(status));
  22 }
  23
  24 void read_loop(void *handle, int master_ticks, int timeout)
  25 {
  26         int count, err;
  27         struct pollfd *fds;
  28         snd_timer_read_t tr;
  29
  30         count = snd_timer_poll_descriptors_count(handle);
  31         fds = calloc(count, sizeof(struct pollfd));
  32         if (fds == NULL) {
  33                 fprintf(stderr, "malloc error\n");
  34                 exit(EXIT_FAILURE);
  35         }
  36         while (master_ticks-- > 0) {
  37                 if ((err = snd_timer_poll_descriptors(handle, fds, count)) < 0) {
  38                         fprintf(stderr, "snd_timer_poll_descriptors error: %s\n", snd_strerror(err));
  39                         exit(EXIT_FAILURE);
  40                 }
  41                 if ((err = poll(fds, count, timeout)) < 0) {
  42                         fprintf(stderr, "poll error %i (%s)\n", err, strerror(err));
  43                         exit(EXIT_FAILURE);
  44                 }
  45                 if (err == 0) {
  46                         fprintf(stderr, "timer time out!!\n");
  47                         exit(EXIT_FAILURE);
  48                 }
  49                 while (snd_timer_read(handle, &tr, sizeof(tr)) == sizeof(tr)) {
  50                         printf("TIMER: resolution = %uns, ticks = %u\n",
  51                                 tr.resolution, tr.ticks);
  52                 }
  53         }
  54         free(fds);
  55 }
  56
  57 int main(int argc, char *argv[])
  58 {
  59         int idx, err;
  60         int class = SND_TIMER_CLASS_GLOBAL;
  61         int sclass = SND_TIMER_CLASS_NONE;
  62         int card = 0;
  63         int device = SND_TIMER_GLOBAL_SYSTEM;
  64         int subdevice = 0;
  65         int list = 0;
  66         snd_timer_t *handle;
  67         snd_timer_id_t *id;
  68         snd_timer_info_t *info;
  69         snd_timer_params_t *params;
  70         char timername[64];
  71
  72         snd_timer_id_alloca(&id);
  73         snd_timer_info_alloca(&info);
  74         snd_timer_params_alloca(&params);
  75
  76         idx = 1;
  77         while (idx < argc) {
  78                 if (!strncmp(argv[idx], "class=", 5)) {
  79                         class = atoi(argv[idx]+6);
  80                 } else if (!strncmp(argv[idx], "sclass=", 6)) {
  81                         sclass = atoi(argv[idx]+7);
  82                 } else if (!strncmp(argv[idx], "card=", 5)) {
  83                         card = atoi(argv[idx]+5);
  84                 } else if (!strncmp(argv[idx], "device=", 7)) {
  85                         device = atoi(argv[idx]+7);
  86                 } else if (!strncmp(argv[idx], "subdevice=", 10)) {
  87                         subdevice = atoi(argv[idx]+10);
  88                 } else if (!strcmp(argv[idx], "list")) {
  89                         list = 1;
  90                 }
  91                 idx++;
  92         }
  93         if (class == SND_TIMER_CLASS_SLAVE && sclass == SND_TIMER_SCLASS_NONE) {
  94                 fprintf(stderr, "slave class is not set\n");
  95                 exit(EXIT_FAILURE);
  96         }
  97         if (list) {
  98                 snd_timer_query_t *qhandle;
  99                 if ((err = snd_timer_query_open(&qhandle, "hw", 0)) < 0) {
 100                         fprintf(stderr, "snd_timer_query_open error: %s\n", snd_strerror(err));
 101                         exit(EXIT_FAILURE);
 102                 }
 103                 snd_timer_id_set_class(id, SND_TIMER_CLASS_NONE);
 104                 while (1) {
 105                         if ((err = snd_timer_query_next_device(qhandle, id)) < 0) {
 106                                 fprintf(stderr, "timer next device error: %s\n", snd_strerror(err));
 107                                 break;
 108                         }
 109                         if (snd_timer_id_get_class(id) < 0)
 110                                 break;
 111                         printf("Timer device: class %i, sclass %i, card %i, device %i, subdevice %i\n",
 112                                         snd_timer_id_get_class(id),
 113                                         snd_timer_id_get_sclass(id),
 114                                         snd_timer_id_get_card(id),
 115                                         snd_timer_id_get_device(id),
 116                                         snd_timer_id_get_subdevice(id));
 117                 }
 118                 snd_timer_query_close(qhandle);
 119                 exit(EXIT_SUCCESS);
 120         }
 121         sprintf(timername, "hw:CLASS=%i,SCLASS=%i,CARD=%i,DEV=%i,SUBDEV=%i", class, sclass, card, device, subdevice);
 122         if ((err = snd_timer_open(&handle, timername, SND_TIMER_OPEN_NONBLOCK))<0) {
 123                 fprintf(stderr, "timer open %i (%s)\n", err, snd_strerror(err));
 124                 exit(EXIT_FAILURE);
 125         }
 126         printf("Using timer class %i, slave class %i, card %i, device %i, subdevice %i\n", class, sclass, card, device, subdevice);
 127         if ((err = snd_timer_info(handle, info)) < 0) {
 128                 fprintf(stderr, "timer info %i (%s)\n", err, snd_strerror(err));
 129                 exit(0);
 130         }
 131         printf("Timer info:\n");
 132         printf("  slave = %s\n", snd_timer_info_is_slave(info) ? "yes" : "no");
 133         printf("  card = %i\n", snd_timer_info_get_card(info));
 134         printf("  id = '%s'\n", snd_timer_info_get_id(info));
 135         printf("  name = '%s'\n", snd_timer_info_get_name(info));
 136         printf("  average resolution = %li\n", snd_timer_info_get_resolution(info));
 137         snd_timer_params_set_auto_start(params, 1);
 138         if (!snd_timer_info_is_slave(info)) {
 139                 snd_timer_params_set_ticks(params, (1000000000 / snd_timer_info_get_resolution(info)) / 50); /* 50Hz */
 140                 if (snd_timer_params_get_ticks(params) < 1)
 141                         snd_timer_params_set_ticks(params, 1);
 142                 printf("Using %li tick(s)\n", snd_timer_params_get_ticks(params));
 143         } else {
 144                 snd_timer_params_set_ticks(params, 1);
 145         }
 146         if ((err = snd_timer_params(handle, params)) < 0) {
 147                 fprintf(stderr, "timer params %i (%s)\n", err, snd_strerror(err));
 148                 exit(0);
 149         }
 150         show_status(handle);
 151         if ((err = snd_timer_start(handle)) < 0) {
 152                 fprintf(stderr, "timer start %i (%s)\n", err, snd_strerror(err));
 153                 exit(EXIT_FAILURE);
 154         }
 155         read_loop(handle, 25, snd_timer_info_is_slave(info) ? 10000 : 25);
 156         show_status(handle);
 157         snd_timer_close(handle);
 158         printf("Done\n");
 159         return EXIT_SUCCESS;
 160 }