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alsa-seq: add some comments

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This commit is contained in:
Wim Taymans 2019-09-26 15:17:00 +02:00
parent f539b42a03
commit 44840c4a55
1 changed files with 3 additions and 0 deletions
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3
spa/plugins/alsa/alsa-seq.c
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@ -470,12 +470,15 @@ static int process_read(struct seq_state *state)
data[2] = 0x40; data[2] = 0x40;
} }
/* queue_time is the estimated current time of the queue as calculated by
* the DLL. Calculate the age of the event. */
ev_time = SPA_TIMESPEC_TO_NSEC(&ev->time.time); ev_time = SPA_TIMESPEC_TO_NSEC(&ev->time.time);
if (state->queue_time > ev_time) if (state->queue_time > ev_time)
diff = state->queue_time - ev_time; diff = state->queue_time - ev_time;
else else
diff = 0; diff = 0;
/* convert the age to samples and convert to an offset */
offset = (diff * state->rate.denom) / (state->rate.num * SPA_NSEC_PER_SEC); offset = (diff * state->rate.denom) / (state->rate.num * SPA_NSEC_PER_SEC);
if (state->duration > offset) if (state->duration > offset)
offset = state->duration - offset; offset = state->duration - offset;