2021-12-11 11:44:43 -05:00
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ardour { ["type"] = "Snippet", name = "tempo map examples" }
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function factory () return function ()
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-- query BPM at 00:00:10:00
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2022-03-17 16:15:53 -04:00
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local tp = Temporal.timepos_t.from_superclock (Temporal.superclock_ticks_per_second () * Session:nominal_sample_rate () * 10)
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2021-12-11 11:44:43 -05:00
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local tm = Temporal.TempoMap.use ()
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print (tm:tempo_at (tp):quarter_notes_per_minute ())
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-- set initial tempo to 140, ramp to 120 over the first 4/4 bar, then continue at BPM 80
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Temporal.TempoMap.fetch_writable ()
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local tm = Temporal.TempoMap.use ()
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tm:set_tempo (Temporal.Tempo (140, 120, 4), Temporal.timepos_t ())
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tm:set_tempo (Temporal.Tempo (80, 80, 4), Temporal.timepos_t.from_ticks (Temporal.ticks_per_beat * 4))
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Temporal.TempoMap.update (tm)
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tm = nil
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-- Abort Edit example
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-- after every call to Temporal.TempoMap.fetch_writable ()
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-- there must be a matching call to
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-- Temporal.TempoMap.update() or Temporal.TempoMap.abort_update()
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Temporal.TempoMap.fetch_writable()
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Temporal.TempoMap.abort_update()
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end end
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