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Add Lua script snippet to query/modify tempo-map

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Robin Gareus 2021-12-11 17:44:43 +01:00
parent ce15b6ed66
commit 2003ca7b5f
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share/scripts/s_tempo_map.lua Normal file
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ardour { ["type"] = "Snippet", name = "tempo map examples" }
function factory () return function ()
-- query BPM at 00:00:10:00
local tp = Temporal.timepos_t.from_superclock (Temporal.superclock_ticks_per_second * Session:nominal_sample_rate () * 10)
local tm = Temporal.TempoMap.use ()
print (tm:tempo_at (tp):quarter_notes_per_minute ())
-- set initial tempo to 140, ramp to 120 over the first 4/4 bar, then continue at BPM 80
Temporal.TempoMap.fetch_writable ()
local tm = Temporal.TempoMap.use ()
tm:set_tempo (Temporal.Tempo (140, 120, 4), Temporal.timepos_t ())
tm:set_tempo (Temporal.Tempo (80, 80, 4), Temporal.timepos_t.from_ticks (Temporal.ticks_per_beat * 4))
Temporal.TempoMap.update (tm)
tm = nil
-- Abort Edit example
-- after every call to Temporal.TempoMap.fetch_writable ()
-- there must be a matching call to
-- Temporal.TempoMap.update() or Temporal.TempoMap.abort_update()
Temporal.TempoMap.fetch_writable()
Temporal.TempoMap.abort_update()
end end