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node-driver: Add sync.force-tracking property

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This property is useful for forcing tracking behavior even if the clock
can directly be used by timerfd.

This can be useful in cases where the clock is for example the realtime
clock and can shift and change during playback unexpectedly. The node
driver can handle this without a DLL. But, in some cases, graphs can
experience a more stable behavior if the DLL is used and it manages
the readjustment to the updated time.

This is also useful for testing and debugging the DLL's behavior.
This commit is contained in:
Carlos Rafael Giani 2026-06-11 20:21:13 +02:00
parent 0a8ddba3e9
commit 943bce9c85
1 changed files with 10 additions and 2 deletions
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12
spa/plugins/support/node-driver.c
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@ -39,6 +39,7 @@ SPA_LOG_TOPIC_DEFINE_STATIC(log_topic, "spa.driver");
#define DEFAULT_CLOCK_PREFIX "clock.system"
#define DEFAULT_CLOCK_ID CLOCK_MONOTONIC
#define DEFAULT_RESYNC_MS 10
#define DEFAULT_FORCE_TRACKING false
#define CLOCK_OFFSET_NAVG 20
#define CLOCK_OFFSET_MAX_ERR (50 * SPA_NSEC_PER_USEC)
@ -60,6 +61,7 @@ struct props {
float resync_ms;
char clock_device[CLOCK_NAME_MAX];
char clock_interface[CLOCK_NAME_MAX];
bool force_tracking;
};
struct clock_offset {
@ -121,6 +123,7 @@ static void reset_props(struct props *props)
props->freewheel_wait = DEFAULT_FREEWHEEL_WAIT;
props->resync_ms = DEFAULT_RESYNC_MS;
reset_props_strings(props);
props->force_tracking = DEFAULT_FORCE_TRACKING;
}
static const struct clock_info {
@ -431,7 +434,9 @@ static void on_timeout(struct spa_source *source)
* separate clock. If tracking is false, then this->props.clock_id
* equals timer_clockid, so "nsec" can directly be used as the current
* driver clock time in that case.
* (See the comment above for the purpose of time_since_nsec.) */
* (See the comment above for the purpose of time_since_nsec.)
* Note that it is possible to force tracking even if the clock is usable
* by timerfd, by setting the "sync.force-tracking" property to true. */
if (this->tracking) {
current_time = gettime_nsec(this, this->props.clock_id);
current_time -= SPA_LIKELY(current_time >= time_since_nsec) ? time_since_nsec : 0;
@ -1048,6 +1053,9 @@ impl_init(const struct spa_handle_factory *factory,
this->props.freewheel_wait = atoi(s);
} else if (spa_streq(k, "resync.ms")) {
this->props.resync_ms = (float)atof(s);
} else if (spa_streq(k, "sync.force-tracking")) {
this->props.force_tracking = spa_atob(s);
spa_log_info(this->log, "forcing DLL based clock tracking: %d", this->props.force_tracking);
}
}
if (this->props.clock_name[0] == '\0') {
@ -1057,7 +1065,7 @@ impl_init(const struct spa_handle_factory *factory,
}
ensure_clock_name(this);
this->tracking = !clock_for_timerfd(this->props.clock_id);
this->tracking = this->props.force_tracking || !clock_for_timerfd(this->props.clock_id);
this->timer_clockid = this->tracking ? CLOCK_MONOTONIC : this->props.clock_id;
this->max_error = 128;