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add a method to compute tempo & meter for an audio source (not used yet)

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This commit is contained in:
Paul Davis 2025-08-08 23:11:59 -06:00
parent ff648b6720
commit 4586b39e8b
2 changed files with 17 additions and 1 deletions
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2
libs/ardour/ardour/audioregion.h
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@ -291,6 +291,8 @@ class LIBARDOUR_API AudioRegion : public Region, public AudioReadable
int _set_state (const XMLNode&, int version, PBD::PropertyChange& what_changed, bool send_signal);
void send_change (const PBD::PropertyChange&);
void ensure_length_sanity ();
void set_tempo_stuff_from_source ();
};
} /* namespace ARDOUR */

16
libs/ardour/audioregion.cc
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@ -433,6 +433,21 @@ AudioRegion::~AudioRegion ()
}
}
void
AudioRegion::set_tempo_stuff_from_source ()
{
samplecnt_t data_size = _session.sample_rate() * 10;
std::unique_ptr<Sample> data (new Sample[data_size]);
if (read (data.get(), 0, data_size, 0) == data_size) {
double tempo;
double beatcount;
estimate_audio_tempo (shared_from_this(), data.get(), data_size, _session.sample_rate(), tempo, _meter, beatcount);
_tempo = Temporal::Tempo (tempo, 4);
}
}
void
AudioRegion::post_set (const PropertyChange& /*ignored*/)
{
@ -2740,4 +2755,3 @@ AudioRegion::ensure_length_sanity ()
_length = timecnt_t (timepos_t (_length.val().samples()), _length.val().position());
}
}