44 lines
1.6 KiB
Lua
44 lines
1.6 KiB
Lua
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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local tp = Temporal.timepos_t (Session:nominal_sample_rate () * 10)
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local tm = Temporal.TempoMap.read ()
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print (tm:quarters_per_minute_at (tp))
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tm = nil
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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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local tm = Temporal.TempoMap.write_copy ()
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tm:set_tempo (Temporal.Tempo (140, 120, 4), Temporal.timepos_t (0))
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tm:set_tempo (Temporal.Tempo (120, 80, 4), Temporal.timepos_t.from_ticks (Temporal.ticks_per_beat * 4))
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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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Session:begin_reversible_command ("Change Tempo Map")
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Temporal.TempoMap.update (tm)
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if not Session:abort_empty_reversible_command () then
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Session:commit_reversible_command (nil)
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end
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tm = nil
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-- Abort Edit example
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-- after every call to Temporal.TempoMap.write_copy ()
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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.write_copy()
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Temporal.TempoMap.abort_update()
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-- get grid -- currently only available in debug-builds
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-- Temporal.superclock_ticks_per_second = 282240000
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tm = Temporal.TempoMap.read ()
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local grid = tm:grid (Temporal.TempoMapPoints(), 0, Temporal.superclock_ticks_per_second (), 0, 1)
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for t in grid[1]:iter () do
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-- each t is-a TempoMapPoint
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local metric = t:to_tempometric ()
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local tempo_point = metric:tempo ()
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local meter_point = metric:meter()
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print (t:time(), tempo_point:to_tempo():quarter_notes_per_minute(), meter_point:note_value())
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end
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tm = nil
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end end
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