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tsproc: Track the validity of the filtered delay explicitly. 

We will want to test whether a valid filtered delay value has been
calculated or not.  However, we cannot simply test for zero since that is
a legitimate possible delay value.  This patch adds a flag that reflects
the state of the filtered delay field.

Signed-off-by: Richard Cochran <richardcochran@gmail.com>
master
Richard Cochran 2017-04-08 20:35:58 +02:00
parent d1bb9ecbd5
commit 74ab3b3728
1 changed files with 4 additions and 0 deletions
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4
tsproc.c
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@ -42,6 +42,7 @@ struct tsproc {
/* Current filtered delay */
tmv_t filtered_delay;
int filtered_delay_valid;
/* Delay filter */
struct filter *delay_filter;
@ -115,6 +116,7 @@ void tsproc_set_clock_rate_ratio(struct tsproc *tsp, double clock_rate_ratio)
void tsproc_set_delay(struct tsproc *tsp, tmv_t delay)
{
tsp->filtered_delay = delay;
tsp->filtered_delay_valid = 1;
}
tmv_t get_raw_delay(struct tsproc *tsp)
@ -149,6 +151,7 @@ int tsproc_update_delay(struct tsproc *tsp, tmv_t *delay)
raw_delay = get_raw_delay(tsp);
tsp->filtered_delay = filter_sample(tsp->delay_filter, raw_delay);
tsp->filtered_delay_valid = 1;
pr_debug("delay filtered %10" PRId64 " raw %10" PRId64,
tsp->filtered_delay, raw_delay);
@ -199,5 +202,6 @@ void tsproc_reset(struct tsproc *tsp, int full)
if (full) {
tsp->clock_rate_ratio = 1.0;
filter_reset(tsp->delay_filter);
tsp->filtered_delay_valid = 0;
}
}