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correct arithmetic used to compute a quantized trigger start/stop transition

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This commit is contained in:
Paul Davis
2025-04-11 11:22:23 -06:00
parent 3486ec924d
commit cf27064915
1 changed files with 13 additions and 6 deletions
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19
libs/ardour/triggerbox.cc
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@@ -1057,12 +1057,19 @@ Trigger::compute_quantized_transition (samplepos_t start_sample, Temporal::Beats
} else {
possible_bbt = tmap->bbt_at (timepos_t (start_beats));
possible_bbt = Temporal::BBT_Argument (possible_bbt.reference(), possible_bbt.round_up_to_bar ());
/* bars are 1-based; 'every 4 bars' means 'on bar 1, 5, 9, ...' */
possible_bbt.bars = 1 + ((possible_bbt.bars-1) / q.bars * q.bars);
possible_beats = tmap->quarters_at (possible_bbt);
possible_samples = tmap->sample_at (possible_bbt);
timepos_t start (start_sample);
Temporal::Beats qb = tmap->meter_at (start).to_quarters (q); /* Quantization as beats */
/* The quantizing code always rounds up, If the start position
* is on a quantize point, we shouldn't do that
*/
possible_beats = tmap->quarters_at (start);
if (possible_beats % qb != Temporal::Beats()) {
possible_beats = ((tmap->quarters_at (start) + (qb/2)) / qb) * qb;
}
possible_bbt = tmap->bbt_at (possible_beats);
possible_samples = tmap->sample_at (possible_beats);
}