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This commit is contained in:
Paul Davis 2019-10-28 16:53:00 -06:00
parent 43eb64d23b
commit 6b654039fb
1 changed files with 17 additions and 4 deletions
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21
libs/ardour/session.cc
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@ -6493,9 +6493,14 @@ Session::set_worst_input_latency ()
void
Session::update_latency_compensation (bool force_whole_graph)
{
/* Called to update Ardour's internal latency values and compensation
* planning. Typically case is from within ::graph_reordered()
*/
if (inital_connect_or_deletion_in_progress ()) {
return;
}
/* this lock is not usually contended, but under certain conditions,
* update_latency_compensation may be called concurrently.
* e.g. drag/drop copy a latent plugin while rolling.
@ -6516,10 +6521,18 @@ Session::update_latency_compensation (bool force_whole_graph)
DEBUG_TRACE (DEBUG::LatencyCompensation, "update_latency_compensation: delegate to engine\n");
/* cannot hold lock while engine initiates a full latency callback */
lx.release ();
_engine.update_latencies ();
/* above call will ask the backend up update its latencies, which
* eventually will trigger AudioEngine::latency_callback () and
* call Session::update_latency ()
/* next call will ask the backend up update its latencies.
*
* The semantics of how the backend does this are not well
* defined (Oct 2019).
*
* In all cases, eventually AudioEngine::latency_callback() is
* invoked, which will call Session::update_latency().
*
* Some backends will do that asynchronously with respect to
* this call. Others (JACK1) will do so synchronously, and in
* those cases this call will return until the backend latency
* callback is complete.
*/
} else {
DEBUG_TRACE (DEBUG::LatencyCompensation, "update_latency_compensation: directly apply to routes\n");