Ongoing work on latency compensation

The general goal is to align transport-sample to be the audible frame
and use that as "anchor" for all processing.

transport_sample cannot become negative (00:00:00:00 is the first audible
frame).

Internally transport pre-rolls (read-ahead) before the transport starts
to move. This allows inputs and disk to prefill the pipeline.

When starting to roll, the session counts down a global "remaning preroll"
counter, which is the worst-latency from in-to-out.
Each route in turn will start processing at its own output-latency.

Route::process_output_buffers() - which does the actual processing
incl disk i/o - begins by offsetting the "current sample" by the
route's process-latency and decrements the offset for each latent
processor.  At the end of the function the output will be aligned
and match  transport-sample - downstream-playback-latency (if any).

PS. This commit is a first step only: transport looping & vari-speed have
not yet been implemented/updated.

1 files changed, 1 insertions, 1 deletions

diff --git a/libs/ardour/track.cc b/libs/ardour/track.cc
index 37c3a99961..2d57ef782a 100644
--- a/libs/ardour/track.cc
+++ b/libs/ardour/track.cc
@@ -536,7 +536,7 @@ Track::no_roll (pframes_t nframes, samplepos_t start_sample, samplepos_t end_sam
 			_meter->run (bufs, start_sample, end_sample, _session.transport_speed(), nframes, true);
 		}
 
-		passthru (bufs, start_sample, end_sample, nframes, false, true);
+		passthru (bufs, start_sample, end_sample, nframes, false, true, false);
 	}
 
 	flush_processor_buffers_locked (nframes);