/*
* =================== Input/output port handling =========================
*/
static
void set_process_info(struct process_info *info, alsa_seqmidi_t *self, int dir, jack_nframes_t nframes)
{
const snd_seq_real_time_t* alsa_time;
snd_seq_queue_status_t *status;
snd_seq_queue_status_alloca(&status);
info->dir = dir;
info->period_start = jack_last_frame_time(self->jack);
info->nframes = nframes;
info->sample_rate = jack_get_sample_rate(self->jack);
info->cur_frames = jack_frame_time(self->jack);
// immediately get alsa'a real time (uhh, why everybody has their own 'real' time)
snd_seq_get_queue_status(self->seq, self->queue, status);
alsa_time = snd_seq_queue_status_get_real_time(status);
info->alsa_time = alsa_time->tv_sec * NSEC_PER_SEC + alsa_time->tv_nsec;
if (info->period_start + info->nframes < info->cur_frames) {
int periods_lost = (info->cur_frames - info->period_start) / info->nframes;
info->period_start += periods_lost * info->nframes;
debug_log("xrun detected: %d periods lost\n", periods_lost);
}
}
static guint32
get_current_tick (void)
{
snd_seq_queue_status_t *status;
snd_seq_queue_status_alloca (&status);
snd_seq_get_queue_status (seq, queue_id, status);
return snd_seq_queue_status_get_tick_time (status);
}
static unsigned int get_tick(void)
{
snd_seq_queue_status_t * status;
int result;
snd_seq_queue_status_alloca(&status);
result = snd_seq_get_queue_status(seq, seq_queue, status);
if (result < 0) {
fprintf(stderr, "ALSA snd_seq_get_queue_status err %d\n", result);
return 0;
}
return (unsigned int) snd_seq_queue_status_get_tick_time(status);
}
