-
-MAKE_SCHEME_CALLBACK (Duration, less_p, 2);
-SCM
-Duration::less_p (SCM p1, SCM p2)
-{
- Duration *a = unsmob_duration (p1);
- Duration *b = unsmob_duration (p2);
-
- if (compare (*a, *b) < 0)
- return SCM_BOOL_T;
- else
- return SCM_BOOL_F;
-}
-
-LY_DEFINE(make_duration,
- "make-duration", 2, 2, 0, (SCM length, SCM dotcount,
- SCM num, SCM den),
- "
-@var{length} is the negative logarithm (base 2) of the duration:
-1 is a half note, 2 is a quarter note, 3 is an eighth
-note, etc. The number of dots after the note is given by
-@var{dotcount}.
-
-The duration factor is optionally given by @var{num} and @var{den}.
-
-A duration is a musical duration, i.e. a length of time described by a
-power of two (whole, half, quarter, etc.) and a number of augmentation
-dots.
-
-")
-{
- SCM_ASSERT_TYPE(gh_number_p(length), length, SCM_ARG1, __FUNCTION__, "integer");
- SCM_ASSERT_TYPE(gh_number_p(dotcount), dotcount, SCM_ARG2, __FUNCTION__, "integer");
-
- bool compress = false;
- if (num != SCM_UNDEFINED)
- {
- SCM_ASSERT_TYPE(gh_number_p(num), length, SCM_ARG3, __FUNCTION__, "integer");
- compress = true;
- }
- else
- num = gh_int2scm (1);
-
- if (den != SCM_UNDEFINED)
- SCM_ASSERT_TYPE(gh_number_p(den), length, SCM_ARG4, __FUNCTION__, "integer");
- else
- den = gh_int2scm (1);
-
- Duration p (gh_scm2int (length), gh_scm2int (dotcount));
- if (compress)
- p = p.compressed (Rational (gh_scm2int (num), gh_scm2int (den)));
-
- return p.smobbed_copy ();
-}
-
-
-
-LY_DEFINE(duration_log,
- "duration-log", 1, 0, 0, (SCM dur),
- "
-Extract the duration log from @var{dur}"
-)
-{
- SCM_ASSERT_TYPE(unsmob_duration(dur), dur, SCM_ARG1, __FUNCTION__, "duration");
-
- return gh_int2scm (unsmob_duration (dur)->duration_log ());
-}
-
-
-LY_DEFINE(dot_count_log,
- "duration-dot-count", 1, 0, 0, (SCM dur),
- "
-Extract the dot count from @var{dur}"
-)
-{
- SCM_ASSERT_TYPE(unsmob_duration(dur), dur, SCM_ARG1, __FUNCTION__, "duration");
-
- return gh_int2scm (unsmob_duration (dur)->dot_count ());
-}
-
-
-LY_DEFINE(ly_intlog2,
- "intlog2", 1, 0, 0, (SCM d),
- "
-Extract the dot count from @var{dur}"
-)
-{
- SCM_ASSERT_TYPE(gh_number_p (d), d, SCM_ARG1, __FUNCTION__, "integer");
-
- int l = intlog2 (gh_scm2int (d));
-
- return gh_int2scm (l);
-}
-
-LY_DEFINE(compression_factor,
- "duration-factor", 1, 0, 0, (SCM dur),
- "
-Extract the compression factor from @var{dur}. Return as a pair."
-)
-{
- SCM_ASSERT_TYPE(unsmob_duration(dur), dur, SCM_ARG1, __FUNCTION__, "duration");
- Rational r =unsmob_duration (dur)->factor ();
-
- return gh_cons(gh_int2scm (r.num()),gh_int2scm (r.den ()));
-}
-
-SCM
-Duration::smobbed_copy ()const
-{
- Duration * p = new Duration (*this);
- return p->smobbed_self ();
-}