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Clarify stop-at-marker transport position logic

This commit is contained in:
Robin Gareus 2020-01-31 02:11:04 +01:00
parent e03136646d
commit cb09a0884b
Signed by: rgareus
GPG Key ID: A090BCE02CF57F04
1 changed files with 14 additions and 2 deletions
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16
scripts/stop_at_marker.lua
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@ -27,10 +27,22 @@ function factory ()
return
end
-- due to "first_mark_after" m is always > pos:
-- due to `first_mark_after(pos)` "m" is always > "pos":
-- assert(pos < m)
-- so in the cycle that crosses "m" we need to stop at 'm'
--
-- This callback happens from within the process callback:
--
-- this cycle's end = next cycle start = pos + n_samples.
--
-- Note that if "m" is exactly at cycle's end, that marker
-- will be at "pos" in the next cycle. Since we ask for
-- "first_mark_after pos", the marker would not be found.
--
-- So even though "pos + n_samples" is barely reached,
-- we need to stop at "m" in the cycle that crosses or ends at "m".
if (pos + n_samples >= m) then
-- asking to locate to "m" ensures that playback continues at "m"
-- and the same marker will not be taken into account.
Session:request_locate (m, ARDOUR.LocateTransportDisposition.MustStop, ARDOUR.TransportRequestSource.TRS_Engine)
end
end