00001 #include <stdio.h> 00002 #include <stdlib.h> 00003 #include <string.h> 00004 #include <sys/time.h> 00005 #include "../include/asoundlib.h" 00006 00007 void show_status(void *handle) 00008 { 00009 int err; 00010 snd_timer_status_t *status; 00011 00012 snd_timer_status_alloca(&status); 00013 if ((err = snd_timer_status(handle, status)) < 0) { 00014 fprintf(stderr, "timer status %i (%s)\n", err, snd_strerror(err)); 00015 return; 00016 } 00017 printf("STATUS:\n"); 00018 printf(" resolution = %li\n", snd_timer_status_get_resolution(status)); 00019 printf(" lost = %li\n", snd_timer_status_get_lost(status)); 00020 printf(" overrun = %li\n", snd_timer_status_get_overrun(status)); 00021 printf(" queue = %li\n", snd_timer_status_get_queue(status)); 00022 } 00023 00024 void read_loop(void *handle, int master_ticks, int timeout) 00025 { 00026 int count, err; 00027 struct pollfd *fds; 00028 snd_timer_read_t tr; 00029 00030 count = snd_timer_poll_descriptors_count(handle); 00031 fds = calloc(count, sizeof(struct pollfd)); 00032 if (fds == NULL) { 00033 fprintf(stderr, "malloc error\n"); 00034 exit(EXIT_FAILURE); 00035 } 00036 while (master_ticks-- > 0) { 00037 if ((err = snd_timer_poll_descriptors(handle, fds, count)) < 0) { 00038 fprintf(stderr, "snd_timer_poll_descriptors error: %s\n", snd_strerror(err)); 00039 exit(EXIT_FAILURE); 00040 } 00041 if ((err = poll(fds, count, timeout)) < 0) { 00042 fprintf(stderr, "poll error %i (%s)\n", err, strerror(err)); 00043 exit(EXIT_FAILURE); 00044 } 00045 if (err == 0) { 00046 fprintf(stderr, "timer time out!!\n"); 00047 exit(EXIT_FAILURE); 00048 } 00049 while (snd_timer_read(handle, &tr, sizeof(tr)) == sizeof(tr)) { 00050 printf("TIMER: resolution = %uns, ticks = %u\n", 00051 tr.resolution, tr.ticks); 00052 } 00053 } 00054 free(fds); 00055 } 00056 00057 static void async_callback(snd_async_handler_t *ahandler) 00058 { 00059 snd_timer_t *handle = snd_async_handler_get_timer(ahandler); 00060 int *acount = snd_async_handler_get_callback_private(ahandler); 00061 snd_timer_read_t tr; 00062 00063 while (snd_timer_read(handle, &tr, sizeof(tr)) == sizeof(tr)) { 00064 printf("TIMER: resolution = %uns, ticks = %u\n", 00065 tr.resolution, tr.ticks); 00066 } 00067 (*acount)++; 00068 } 00069 00070 int main(int argc, char *argv[]) 00071 { 00072 int idx, err; 00073 int class = SND_TIMER_CLASS_GLOBAL; 00074 int sclass = SND_TIMER_CLASS_NONE; 00075 int card = 0; 00076 int device = SND_TIMER_GLOBAL_SYSTEM; 00077 int subdevice = 0; 00078 int list = 0; 00079 int async = 0; 00080 int acount = 0; 00081 snd_timer_t *handle; 00082 snd_timer_id_t *id; 00083 snd_timer_info_t *info; 00084 snd_timer_params_t *params; 00085 char timername[64]; 00086 snd_async_handler_t *ahandler; 00087 00088 snd_timer_id_alloca(&id); 00089 snd_timer_info_alloca(&info); 00090 snd_timer_params_alloca(¶ms); 00091 00092 idx = 1; 00093 while (idx < argc) { 00094 if (!strncmp(argv[idx], "class=", 5)) { 00095 class = atoi(argv[idx]+6); 00096 } else if (!strncmp(argv[idx], "sclass=", 6)) { 00097 sclass = atoi(argv[idx]+7); 00098 } else if (!strncmp(argv[idx], "card=", 5)) { 00099 card = atoi(argv[idx]+5); 00100 } else if (!strncmp(argv[idx], "device=", 7)) { 00101 device = atoi(argv[idx]+7); 00102 } else if (!strncmp(argv[idx], "subdevice=", 10)) { 00103 subdevice = atoi(argv[idx]+10); 00104 } else if (!strcmp(argv[idx], "list")) { 00105 list = 1; 00106 } else if (!strcmp(argv[idx], "async")) { 00107 async = 1; 00108 } 00109 idx++; 00110 } 00111 if (class == SND_TIMER_CLASS_SLAVE && sclass == SND_TIMER_SCLASS_NONE) { 00112 fprintf(stderr, "slave class is not set\n"); 00113 exit(EXIT_FAILURE); 00114 } 00115 if (list) { 00116 snd_timer_query_t *qhandle; 00117 if ((err = snd_timer_query_open(&qhandle, "hw", 0)) < 0) { 00118 fprintf(stderr, "snd_timer_query_open error: %s\n", snd_strerror(err)); 00119 exit(EXIT_FAILURE); 00120 } 00121 snd_timer_id_set_class(id, SND_TIMER_CLASS_NONE); 00122 while (1) { 00123 if ((err = snd_timer_query_next_device(qhandle, id)) < 0) { 00124 fprintf(stderr, "timer next device error: %s\n", snd_strerror(err)); 00125 break; 00126 } 00127 if (snd_timer_id_get_class(id) < 0) 00128 break; 00129 printf("Timer device: class %i, sclass %i, card %i, device %i, subdevice %i\n", 00130 snd_timer_id_get_class(id), 00131 snd_timer_id_get_sclass(id), 00132 snd_timer_id_get_card(id), 00133 snd_timer_id_get_device(id), 00134 snd_timer_id_get_subdevice(id)); 00135 } 00136 snd_timer_query_close(qhandle); 00137 exit(EXIT_SUCCESS); 00138 } 00139 sprintf(timername, "hw:CLASS=%i,SCLASS=%i,CARD=%i,DEV=%i,SUBDEV=%i", class, sclass, card, device, subdevice); 00140 if ((err = snd_timer_open(&handle, timername, SND_TIMER_OPEN_NONBLOCK))<0) { 00141 fprintf(stderr, "timer open %i (%s)\n", err, snd_strerror(err)); 00142 exit(EXIT_FAILURE); 00143 } 00144 printf("Using timer class %i, slave class %i, card %i, device %i, subdevice %i\n", class, sclass, card, device, subdevice); 00145 if ((err = snd_timer_info(handle, info)) < 0) { 00146 fprintf(stderr, "timer info %i (%s)\n", err, snd_strerror(err)); 00147 exit(0); 00148 } 00149 printf("Timer info:\n"); 00150 printf(" slave = %s\n", snd_timer_info_is_slave(info) ? "yes" : "no"); 00151 printf(" card = %i\n", snd_timer_info_get_card(info)); 00152 printf(" id = '%s'\n", snd_timer_info_get_id(info)); 00153 printf(" name = '%s'\n", snd_timer_info_get_name(info)); 00154 printf(" average resolution = %li\n", snd_timer_info_get_resolution(info)); 00155 snd_timer_params_set_auto_start(params, 1); 00156 if (!snd_timer_info_is_slave(info)) { 00157 snd_timer_params_set_ticks(params, (1000000000 / snd_timer_info_get_resolution(info)) / 50); /* 50Hz */ 00158 if (snd_timer_params_get_ticks(params) < 1) 00159 snd_timer_params_set_ticks(params, 1); 00160 printf("Using %li tick(s)\n", snd_timer_params_get_ticks(params)); 00161 } else { 00162 snd_timer_params_set_ticks(params, 1); 00163 } 00164 if ((err = snd_timer_params(handle, params)) < 0) { 00165 fprintf(stderr, "timer params %i (%s)\n", err, snd_strerror(err)); 00166 exit(0); 00167 } 00168 show_status(handle); 00169 if (async) { 00170 err = snd_async_add_timer_handler(&ahandler, handle, async_callback, &acount); 00171 if (err < 0) { 00172 fprintf(stderr, "unable to add async handler %i (%s)\n", err, snd_strerror(err)); 00173 exit(EXIT_FAILURE); 00174 } 00175 } 00176 if ((err = snd_timer_start(handle)) < 0) { 00177 fprintf(stderr, "timer start %i (%s)\n", err, snd_strerror(err)); 00178 exit(EXIT_FAILURE); 00179 } 00180 if (async) { 00181 /* because all other work is done in the signal handler, 00182 suspend the process */ 00183 while (acount < 25) 00184 sleep(1); 00185 snd_timer_stop(handle); 00186 } else { 00187 read_loop(handle, 25, snd_timer_info_is_slave(info) ? 10000 : 25); 00188 } 00189 show_status(handle); 00190 snd_timer_close(handle); 00191 printf("Done\n"); 00192 return EXIT_SUCCESS; 00193 }