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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "../include/asoundlib.h"
void show_status(void *handle)
{
int err;
snd_timer_status_t status;
if ((err = snd_timer_status(handle, &status)) < 0) {
fprintf(stderr, "timer status %i (%s)\n", err, snd_strerror(err));
return;
}
printf("STATUS:\n");
printf(" resolution = %lu\n", status.resolution);
printf(" lost = %lu\n", status.lost);
printf(" overrun = %lu\n", status.overrun);
printf(" queue = %i\n", status.queue);
}
void read_loop(void *handle, int master_ticks, int timeout)
{
int err, max;
fd_set in;
struct timeval tv;
snd_timer_read_t tr;
while (master_ticks-- > 0) {
FD_ZERO(&in);
max = snd_timer_file_descriptor(handle);
FD_SET(max, &in);
tv.tv_sec = timeout;
tv.tv_usec = 0;
if ((err = select(max + 1, &in, NULL, NULL, &tv)) < 0) {
fprintf(stderr, "select error %i (%s)\n", err, strerror(err));
exit(0);
}
if (err == 0) {
fprintf(stderr, "timer time out!!\n");
exit(0);
}
while (snd_timer_read(handle, &tr, sizeof(tr)) == sizeof(tr)) {
printf("TIMER: resolution = %lu, ticks = %lu\n",
tr.resolution, tr.ticks);
}
}
}
int main(int argc, char *argv[])
{
int idx, err;
int timer = SND_TIMER_GLOBAL(SND_TIMER_GLOBAL_SYSTEM);
int slave = 0;
int slave_type = SND_TIMER_STYPE_SEQUENCER, slave_id = 0;
snd_timer_t *handle;
snd_timer_general_info_t ginfo;
snd_timer_select_t sel;
snd_timer_info_t info;
snd_timer_params_t params;
idx = 1;
while (idx < argc) {
if (!strncmp(argv[idx], "timer=", 6)) {
timer = atoi(argv[idx]+6);
} else if (!strcmp(argv[idx], "slave")) {
slave = 1;
} else if (!strncmp(argv[idx], "slave_type=", 11)) {
slave_type = atoi(argv[idx]+11);
} else if (!strncmp(argv[idx], "slave_id=", 9)) {
slave_id = atoi(argv[idx]+9);
}
idx++;
}
if (slave && slave_type == SND_TIMER_STYPE_NONE) {
fprintf(stderr, "sync_type is not set\n");
exit(0);
}
if ((err = snd_timer_open(&handle))<0) {
fprintf(stderr, "timer open %i (%s)\n", err, snd_strerror(err));
exit(0);
}
if (snd_timer_general_info(handle, &ginfo)<0) {
fprintf(stderr, "timer general info %i (%s)\n", err, snd_strerror(err));
exit(0);
}
printf("Global timers = %i\n", ginfo.count);
printf("Using timer %i, slave %i, slave_type %i, slave_id %i\n", timer, slave, slave_type, slave_id);
bzero(&sel, sizeof(sel));
sel.slave = slave;
if (!sel.slave) {
sel.data.number = timer;
} else {
sel.data.slave.type = slave_type;
sel.data.slave.id = slave_id;
}
if ((err = snd_timer_select(handle, &sel)) < 0) {
fprintf(stderr, "timer select %i (%s)\n", err, snd_strerror(err));
exit(0);
}
if (!sel.slave) {
if ((err = snd_timer_info(handle, &info)) < 0) {
fprintf(stderr, "timer info %i (%s)\n", err, snd_strerror(err));
exit(0);
}
printf("Timer %i info:\n", sel.data.number);
printf(" flags = 0x%x\n", info.flags);
printf(" id = '%s'\n", info.id);
printf(" name = '%s'\n", info.name);
printf(" max ticks = %lu\n", info.ticks);
printf(" average resolution = %lu\n", info.resolution);
bzero(¶ms, sizeof(params));
params.flags = SND_TIMER_PSFLG_AUTO;
params.ticks = (1000000000 / info.resolution) / 50; /* 50Hz */
if (params.ticks < 1)
params.ticks = 1;
printf("Using %lu tick(s)\n", params.ticks);
if ((err = snd_timer_params(handle, ¶ms)) < 0) {
fprintf(stderr, "timer params %i (%s)\n", err, snd_strerror(err));
exit(0);
}
}
show_status(handle);
if ((err = snd_timer_start(handle)) < 0) {
fprintf(stderr, "timer start %i (%s)\n", err, snd_strerror(err));
exit(0);
}
read_loop(handle, 25, sel.slave ? 10000 : 1);
show_status(handle);
snd_timer_close(handle);
return 0;
}
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