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add smf_length_is_explicit() to libsmf

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This commit is contained in:
Paul Davis 2025-02-28 16:49:15 -07:00
parent 7ded62c37f
commit efcb26d7c1
2 changed files with 40 additions and 0 deletions
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39
libs/evoral/libsmf/smf.c
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@ -1023,6 +1023,45 @@ smf_get_length_pulses(const smf_t *smf)
return (pulses);
}
/**
* \return nonzero if the last event in the file has a non-zero delta time,
* and zero otherwise. A non-zero delta time is taken to indicate that the
* file creator explicitly set the length, although it is possible that
* this was done even with a zero delta time (if the last "real" event happened
* to be at the right time.
*/
int
smf_length_is_explicit (const smf_t *smf)
{
int i;
size_t pulses = 0;
smf_event_t* last_event = NULL;
for (i = 1; i <= smf->number_of_tracks; i++) {
smf_track_t *track;
smf_event_t *event;
track = smf_get_track_by_number(smf, i);
assert(track);
event = smf_track_get_last_event(track);
/* Empty track? */
if (event == NULL)
continue;
if (event->time_pulses > pulses) {
pulses = event->time_pulses;
last_event = event;
}
}
if (last_event) {
return last_event->delta_time_pulses != 0;
}
return 0;
}
/**
* \return Nonzero, if there are no events in the SMF after this one.
* Note that may be more than one "last event", if they occur at the same time.

1
libs/evoral/libsmf/smf.h
View file

@ -346,6 +346,7 @@ int smf_seek_to_event(smf_t *smf, const smf_event_t *event) WARN_UNUSED_RESULT;
size_t smf_get_length_pulses(const smf_t *smf) WARN_UNUSED_RESULT;
int smf_event_is_last(const smf_event_t *event) WARN_UNUSED_RESULT;
int smf_length_is_explicit(const smf_t *event) WARN_UNUSED_RESULT;
void smf_add_track(smf_t *smf, smf_track_t *track);
void smf_track_remove_from_smf(smf_track_t *track);