Blame test/queue_timer.c

Packit Service db8eaa
#include <unistd.h>
Packit Service db8eaa
#include <sys/time.h>
Packit Service db8eaa
#include <alsa/asoundlib.h>
Packit Service db8eaa
#include <alsa/seq.h>
Packit Service db8eaa
Packit Service db8eaa
void normalize(struct timeval *tv)
Packit Service db8eaa
{
Packit Service db8eaa
    if (tv->tv_sec == 0) {
Packit Service db8eaa
	while (tv->tv_usec <= -1000000) { tv->tv_usec += 1000000; --tv->tv_sec; }
Packit Service db8eaa
	while (tv->tv_usec >=  1000000) { tv->tv_usec -= 1000000; ++tv->tv_sec; }
Packit Service db8eaa
    } else if (tv->tv_sec < 0) {
Packit Service db8eaa
	while (tv->tv_usec <= -1000000) { tv->tv_usec += 1000000; --tv->tv_sec; }
Packit Service db8eaa
	while (tv->tv_usec > 0) { tv->tv_usec -= 1000000; ++tv->tv_sec; }
Packit Service db8eaa
    } else { 
Packit Service db8eaa
	while (tv->tv_usec >= 1000000) { tv->tv_usec -= 1000000; ++tv->tv_sec; }
Packit Service db8eaa
	while (tv->tv_usec < 0) { tv->tv_usec += 1000000; --tv->tv_sec; }
Packit Service db8eaa
    }
Packit Service db8eaa
}
Packit Service db8eaa
Packit Service db8eaa
int
Packit Service db8eaa
main(int argc ATTRIBUTE_UNUSED, char **argv ATTRIBUTE_UNUSED)
Packit Service db8eaa
{
Packit Service db8eaa
    snd_seq_t *handle;
Packit Service db8eaa
    int portid;
Packit Service db8eaa
    /* int npfd;
Packit Service db8eaa
       struct pollfd *pfd;
Packit Service db8eaa
    */
Packit Service db8eaa
    int queue;
Packit Service db8eaa
    /* int i;
Packit Service db8eaa
       int rval;'
Packit Service db8eaa
    */
Packit Service db8eaa
    struct timeval starttv, prevdiff;
Packit Service db8eaa
    int countdown = -1;
Packit Service db8eaa
    /* snd_seq_queue_timer_t *timer;
Packit Service db8eaa
       snd_timer_id_t *timerid;
Packit Service db8eaa
    */
Packit Service db8eaa
Packit Service db8eaa
    if (snd_seq_open(&handle, "hw", SND_SEQ_OPEN_DUPLEX, 0) < 0) {
Packit Service db8eaa
	fprintf(stderr, "failed to open ALSA sequencer interface\n");
Packit Service db8eaa
	return 1;
Packit Service db8eaa
    }
Packit Service db8eaa
Packit Service db8eaa
    snd_seq_set_client_name(handle, "generator");
Packit Service db8eaa
Packit Service db8eaa
    if ((portid = snd_seq_create_simple_port
Packit Service db8eaa
	 (handle, "generator",
Packit Service db8eaa
	  SND_SEQ_PORT_CAP_READ | SND_SEQ_PORT_CAP_SUBS_READ, 0)) < 0) {
Packit Service db8eaa
	fprintf(stderr, "failed to create ALSA sequencer port\n");
Packit Service db8eaa
	return 1;
Packit Service db8eaa
    }
Packit Service db8eaa
Packit Service db8eaa
    if ((queue = snd_seq_alloc_queue(handle)) < 0) {
Packit Service db8eaa
	fprintf(stderr, "failed to create ALSA sequencer queue\n");
Packit Service db8eaa
	return 1;
Packit Service db8eaa
    }
Packit Service db8eaa
/*
Packit Service db8eaa
    snd_seq_queue_timer_alloca(&timer;;
Packit Service db8eaa
    snd_seq_get_queue_timer(handle, queue, timer);
Packit Service db8eaa
    snd_timer_id_alloca(&timerid);
Packit Service db8eaa
    snd_timer_id_set_class(timerid, SND_TIMER_CLASS_PCM);
Packit Service db8eaa
    snd_timer_id_set_sclass(timerid, SND_TIMER_SCLASS_NONE);
Packit Service db8eaa
    snd_timer_id_set_card(timerid, 0);
Packit Service db8eaa
    snd_timer_id_set_device(timerid, 0);
Packit Service db8eaa
    snd_timer_id_set_subdevice(timerid, 0);
Packit Service db8eaa
    snd_seq_queue_timer_set_id(timer, timerid);
Packit Service db8eaa
    snd_seq_set_queue_timer(handle, queue, timer);
Packit Service db8eaa
*/
Packit Service db8eaa
    snd_seq_start_queue(handle, queue, 0);
Packit Service db8eaa
    snd_seq_drain_output(handle);
Packit Service db8eaa
Packit Service db8eaa
    gettimeofday(&starttv, 0);
Packit Service db8eaa
    prevdiff.tv_sec = 0;
Packit Service db8eaa
    prevdiff.tv_usec = 0;
Packit Service db8eaa
Packit Service db8eaa
    while (countdown != 0) {
Packit Service db8eaa
Packit Service db8eaa
	snd_seq_queue_status_t *status;
Packit Service db8eaa
	const snd_seq_real_time_t *rtime;
Packit Service db8eaa
	struct timeval tv, diff, diffdiff;
Packit Service db8eaa
	struct timespec ts;
Packit Service db8eaa
Packit Service db8eaa
	snd_seq_queue_status_alloca(&status);
Packit Service db8eaa
Packit Service db8eaa
	snd_seq_get_queue_status(handle, queue, status);
Packit Service db8eaa
	rtime = snd_seq_queue_status_get_real_time(status);
Packit Service db8eaa
Packit Service db8eaa
	gettimeofday(&tv, 0);
Packit Service db8eaa
Packit Service db8eaa
	tv.tv_sec -= starttv.tv_sec;
Packit Service db8eaa
	tv.tv_usec -= starttv.tv_usec;
Packit Service db8eaa
	normalize(&tv;;
Packit Service db8eaa
Packit Service db8eaa
	diff.tv_sec = tv.tv_sec - rtime->tv_sec;
Packit Service db8eaa
	diff.tv_usec = tv.tv_usec - rtime->tv_nsec / 1000;
Packit Service db8eaa
	normalize(&diff);
Packit Service db8eaa
Packit Service db8eaa
	diffdiff.tv_sec = diff.tv_sec - prevdiff.tv_sec;
Packit Service db8eaa
	diffdiff.tv_usec = diff.tv_usec - prevdiff.tv_usec;
Packit Service db8eaa
	normalize(&diffdiff);
Packit Service db8eaa
	prevdiff = diff;
Packit Service db8eaa
Packit Service db8eaa
	fprintf(stderr, " real time: %12ld sec %8ld usec\nqueue time: %12ld sec %8ld usec\n      diff: %12ld sec %8ld usec\n  diffdiff: %12ld sec %8ld usec\n",
Packit Service db8eaa
		tv.tv_sec, tv.tv_usec,
Packit Service db8eaa
		(long)rtime->tv_sec, (long)rtime->tv_nsec / 1000,
Packit Service db8eaa
		diff.tv_sec, diff.tv_usec,
Packit Service db8eaa
		(long)diffdiff.tv_sec, (long)diffdiff.tv_usec);
Packit Service db8eaa
Packit Service db8eaa
	if (diffdiff.tv_usec >  5000 ||
Packit Service db8eaa
	    diffdiff.tv_usec < -5000) {
Packit Service db8eaa
	    fprintf(stderr, "oops! queue slipped\n");
Packit Service db8eaa
	    if (tv.tv_sec < 5) {
Packit Service db8eaa
		fprintf(stderr, "(ignoring in first few seconds)\n");
Packit Service db8eaa
	    } else {
Packit Service db8eaa
		countdown = 2;
Packit Service db8eaa
	    }
Packit Service db8eaa
	} else {
Packit Service db8eaa
	    if (countdown > 0) --countdown;
Packit Service db8eaa
	}
Packit Service db8eaa
Packit Service db8eaa
	fprintf(stderr, "\n");
Packit Service db8eaa
//	sleep(1);
Packit Service db8eaa
	ts.tv_sec = 0;
Packit Service db8eaa
	ts.tv_nsec = 500000000;
Packit Service db8eaa
	nanosleep(&ts, 0);
Packit Service db8eaa
    }
Packit Service db8eaa
    return EXIT_SUCCESS;
Packit Service db8eaa
}
Packit Service db8eaa