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97 lines
2.5 KiB
97 lines
2.5 KiB
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#include <alsa/asoundlib.h>
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#include <alsa/seq.h>
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#include <sys/time.h>
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int
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main(int argc, char **argv)
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{
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snd_seq_t *handle;
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int portid;
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int npfd;
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struct pollfd *pfd;
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int queue;
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int i;
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int rval;
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int target;
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snd_seq_queue_timer_t *timer;
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snd_timer_id_t *timerid;
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if (argc != 2) {
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fprintf(stderr, "usage: generator <target-client-id>\n");
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exit(2);
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}
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target = atoi(argv[1]);
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if (snd_seq_open(&handle, "hw", SND_SEQ_OPEN_DUPLEX, 0) < 0) {
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fprintf(stderr, "failed to open ALSA sequencer interface\n");
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return 1;
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}
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snd_seq_set_client_name(handle, "generator");
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if ((portid = snd_seq_create_simple_port
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(handle, "generator",
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SND_SEQ_PORT_CAP_READ | SND_SEQ_PORT_CAP_SUBS_READ, 0)) < 0) {
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fprintf(stderr, "failed to create ALSA sequencer port\n");
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return 1;
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}
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if ((queue = snd_seq_alloc_queue(handle)) < 0) {
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fprintf(stderr, "failed to create ALSA sequencer queue\n");
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return 1;
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}
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/*
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snd_seq_queue_timer_alloca(&timer);
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snd_seq_get_queue_timer(handle, queue, timer);
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snd_timer_id_alloca(&timerid);
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snd_timer_id_set_class(timerid, SND_TIMER_CLASS_PCM);
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snd_timer_id_set_sclass(timerid, SND_TIMER_SCLASS_NONE);
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snd_timer_id_set_card(timerid, 0);
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snd_timer_id_set_device(timerid, 0);
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snd_timer_id_set_subdevice(timerid, 0);
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snd_seq_queue_timer_set_id(timer, timerid);
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snd_seq_set_queue_timer(handle, queue, timer);
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*/
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snd_seq_start_queue(handle, queue, 0);
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// stuff two minutes worth of events on the queue
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for (i = 0; i < 240; ++i) {
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snd_seq_real_time_t rtime;
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rtime.tv_sec = i / 2;
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rtime.tv_nsec = (i % 2) * 500000000;
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snd_seq_event_t ev;
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snd_seq_ev_clear(&ev);
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snd_seq_ev_set_source(&ev, portid);
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snd_seq_ev_set_dest(&ev, target, 0);
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snd_seq_ev_schedule_real(&ev, queue, 0, &rtime);
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snd_seq_ev_set_noteon(&ev, 0, 64, 127);
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if ((rval = snd_seq_event_output(handle, &ev)) < 0) {
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fprintf(stderr, "failed to write event: %s", snd_strerror(rval));
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}
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}
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snd_seq_drain_output(handle);
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for (i = 0; i < 120; ++i) {
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snd_seq_queue_status_t *status;
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const snd_seq_real_time_t *rtime;
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struct timeval tv;
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snd_seq_queue_status_alloca(&status);
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snd_seq_get_queue_status(handle, queue, status);
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rtime = snd_seq_queue_status_get_real_time(status);
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gettimeofday(&tv, 0);
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fprintf(stderr, " real time: %ld sec, %ld usec\nqueue time: %ld sec, %ld usec (diff to real time %ld sec %ld usec)\n",
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tv.tv_sec, tv.tv_usec,
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rtime->tv_sec, rtime->tv_nsec / 1000,
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tv.tv_sec - rtime->tv_sec, tv.tv_usec - (rtime->tv_nsec / 1000));
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sleep(1);
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}
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}
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