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 static void async_callback(snd_async_handler_t *ahandler) 58 { 59 snd_timer_t *handle = snd_async_handler_get_timer(ahandler); 60 int *acount = snd_async_handler_get_callback_private(ahandler); 61 snd_timer_read_t tr; 62 63 while (snd_timer_read(handle, &tr, sizeof(tr)) == sizeof(tr)) { 64 printf("TIMER: resolution = %uns, ticks = %u\n", 65 tr.resolution, tr.ticks); 66 } 67 (*acount)++; 68 } 69 70 int main(int argc, char *argv[]) 71 { 72 int idx, err; 73 int class = SND_TIMER_CLASS_GLOBAL; 74 int sclass = SND_TIMER_CLASS_NONE; 75 int card = 0; 76 int device = SND_TIMER_GLOBAL_SYSTEM; 77 int subdevice = 0; 78 int list = 0; 79 int async = 0; 80 int acount = 0; 81 snd_timer_t *handle; 82 snd_timer_id_t *id; 83 snd_timer_info_t *info; 84 snd_timer_params_t *params; 85 char timername[64]; 86 snd_async_handler_t *ahandler; 87 88 snd_timer_id_alloca(&id); 89 snd_timer_info_alloca(&info); 90 snd_timer_params_alloca(¶ms); 91 92 idx = 1; 93 while (idx < argc) { 94 if (!strncmp(argv[idx], "class=", 5)) { 95 class = atoi(argv[idx]+6); 96 } else if (!strncmp(argv[idx], "sclass=", 6)) { 97 sclass = atoi(argv[idx]+7); 98 } else if (!strncmp(argv[idx], "card=", 5)) { 99 card = atoi(argv[idx]+5); 100 } else if (!strncmp(argv[idx], "device=", 7)) { 101 device = atoi(argv[idx]+7); 102 } else if (!strncmp(argv[idx], "subdevice=", 10)) { 103 subdevice = atoi(argv[idx]+10); 104 } else if (!strcmp(argv[idx], "list")) { 105 list = 1; 106 } else if (!strcmp(argv[idx], "async")) { 107 async = 1; 108 } 109 idx++; 110 } 111 if (class == SND_TIMER_CLASS_SLAVE && sclass == SND_TIMER_SCLASS_NONE) { 112 fprintf(stderr, "slave class is not set\n"); 113 exit(EXIT_FAILURE); 114 } 115 if (list) { 116 snd_timer_query_t *qhandle; 117 if ((err = snd_timer_query_open(&qhandle, "hw", 0)) < 0) { 118 fprintf(stderr, "snd_timer_query_open error: %s\n", snd_strerror(err)); 119 exit(EXIT_FAILURE); 120 } 121 snd_timer_id_set_class(id, SND_TIMER_CLASS_NONE); 122 while (1) { 123 if ((err = snd_timer_query_next_device(qhandle, id)) < 0) { 124 fprintf(stderr, "timer next device error: %s\n", snd_strerror(err)); 125 break; 126 } 127 if (snd_timer_id_get_class(id) < 0) 128 break; 129 printf("Timer device: class %i, sclass %i, card %i, device %i, subdevice %i\n", 130 snd_timer_id_get_class(id), 131 snd_timer_id_get_sclass(id), 132 snd_timer_id_get_card(id), 133 snd_timer_id_get_device(id), 134 snd_timer_id_get_subdevice(id)); 135 } 136 snd_timer_query_close(qhandle); 137 exit(EXIT_SUCCESS); 138 } 139 sprintf(timername, "hw:CLASS=%i,SCLASS=%i,CARD=%i,DEV=%i,SUBDEV=%i", class, sclass, card, device, subdevice); 140 if ((err = snd_timer_open(&handle, timername, SND_TIMER_OPEN_NONBLOCK))<0) { 141 fprintf(stderr, "timer open %i (%s)\n", err, snd_strerror(err)); 142 exit(EXIT_FAILURE); 143 } 144 printf("Using timer class %i, slave class %i, card %i, device %i, subdevice %i\n", class, sclass, card, device, subdevice); 145 if ((err = snd_timer_info(handle, info)) < 0) { 146 fprintf(stderr, "timer info %i (%s)\n", err, snd_strerror(err)); 147 exit(0); 148 } 149 printf("Timer info:\n"); 150 printf(" slave = %s\n", snd_timer_info_is_slave(info) ? "yes" : "no"); 151 printf(" card = %i\n", snd_timer_info_get_card(info)); 152 printf(" id = '%s'\n", snd_timer_info_get_id(info)); 153 printf(" name = '%s'\n", snd_timer_info_get_name(info)); 154 printf(" average resolution = %li\n", snd_timer_info_get_resolution(info)); 155 snd_timer_params_set_auto_start(params, 1); 156 if (!snd_timer_info_is_slave(info)) { 157 snd_timer_params_set_ticks(params, (1000000000 / snd_timer_info_get_resolution(info)) / 50); /* 50Hz */ 158 if (snd_timer_params_get_ticks(params) < 1) 159 snd_timer_params_set_ticks(params, 1); 160 printf("Using %li tick(s)\n", snd_timer_params_get_ticks(params)); 161 } else { 162 snd_timer_params_set_ticks(params, 1); 163 } 164 if ((err = snd_timer_params(handle, params)) < 0) { 165 fprintf(stderr, "timer params %i (%s)\n", err, snd_strerror(err)); 166 exit(0); 167 } 168 show_status(handle); 169 if (async) { 170 err = snd_async_add_timer_handler(&ahandler, handle, async_callback, &acount); 171 if (err < 0) { 172 fprintf(stderr, "unable to add async handler %i (%s)\n", err, snd_strerror(err)); 173 exit(EXIT_FAILURE); 174 } 175 } 176 if ((err = snd_timer_start(handle)) < 0) { 177 fprintf(stderr, "timer start %i (%s)\n", err, snd_strerror(err)); 178 exit(EXIT_FAILURE); 179 } 180 if (async) { 181 /* because all other work is done in the signal handler, 182 suspend the process */ 183 while (acount < 25) 184 sleep(1); 185 snd_timer_stop(handle); 186 } else { 187 read_loop(handle, 25, snd_timer_info_is_slave(info) ? 10000 : 25); 188 } 189 show_status(handle); 190 snd_timer_close(handle); 191 printf("Done\n"); 192 return EXIT_SUCCESS; 193 } 194
