+Music::set_spot (Input ip)
+{
+ set_property ("origin", make_input (ip));
+}
+
+Input*
+Music::origin () const
+{
+ Input *ip = unsmob_input (get_property ("origin"));
+ return ip ? ip : & dummy_input_global;
+}
+
+int
+Music::duration_log () const
+{
+ if (is_mus_type ("rhythmic-event"))
+ return unsmob_duration (get_property ("duration"))->duration_log ();
+ return 0;
+}
+
+Music*
+make_music_by_name (SCM sym)
+{
+ SCM make_music_proc = ly_scheme_function ("make-music");
+ SCM rv = scm_call_1 (make_music_proc, sym);
+
+ /* UGH. */
+ scm_gc_protect_object (rv);
+ return unsmob_music (rv);
+}
+
+LY_DEFINE (ly_music_length, "ly:music-length",
+ 1, 0, 0, (SCM mus),
+ "Get the length of music expression @var{mus}, and return as a @code{Moment} object.")
+{
+ Music *sc = unsmob_music (mus);
+ SCM_ASSERT_TYPE (sc, mus, SCM_ARG1, __FUNCTION__, "music");
+ return sc->get_length ().smobbed_copy ();
+}
+
+LY_DEFINE (ly_music_property,
+ "ly:music-property", 2, 0, 0, (SCM mus, SCM sym),
+ "Get the property @var{sym} of music expression @var{mus}.\n"
+ "If @var{sym} is undefined, return @code{' ()}.\n" )
+{
+ Music * sc = unsmob_music (mus);
+ SCM_ASSERT_TYPE (sc, mus, SCM_ARG1, __FUNCTION__, "music");
+ SCM_ASSERT_TYPE (scm_is_symbol (sym), sym, SCM_ARG2, __FUNCTION__, "symbol");
+
+ return sc->internal_get_property (sym);
+}
+
+LY_DEFINE (ly_music_set_property, "ly:music-set-property!",
+ 3, 0, 0, (SCM mus, SCM sym, SCM val),
+ "Set property @var{sym} in music expression @var{mus} to @var{val}.")
+{
+ Music * sc = unsmob_music (mus);
+ SCM_ASSERT_TYPE (sc, mus, SCM_ARG1, __FUNCTION__, "music");
+ SCM_ASSERT_TYPE (scm_is_symbol (sym), sym, SCM_ARG2, __FUNCTION__, "symbol");
+
+ bool ok = type_check_assignment (sym, val, ly_symbol2scm ("music-type?"));
+ if (ok)
+ {
+ sc->internal_set_property (sym, val);
+ }
+
+ return SCM_UNSPECIFIED;
+}
+
+LY_DEFINE (ly_music_name, "ly:music-name",
+ 1, 0, 0, (SCM mus),
+ "Return the name of @var{music}.")
+{
+ Music *m = unsmob_music (mus);
+ SCM_ASSERT_TYPE (m, mus, SCM_ARG1, __FUNCTION__ ,"music");
+
+ char const *nm = classname (m);
+ return scm_makfrom0str (nm);
+}
+
+/* todo: property args */
+LY_DEFINE (ly_extended_make_music, "ly:make-bare-music",
+ 2, 0, 0, (SCM type, SCM props),
+ "Make a C++ music object of type @var{type}, initialize with\n"
+ "@var{props}. \n\n"
+ ""
+ "This function is for internal use, and is only called by "
+ "@code{make-music}, which is the preferred interface "
+ "for creating music objects. "
+ )
+{
+ SCM_ASSERT_TYPE (scm_is_string (type), type, SCM_ARG1, __FUNCTION__, "string");
+ SCM s = make_music (ly_scm2string (type))->self_scm ();
+ unsmob_music (s)->immutable_property_alist_ = props;
+ scm_gc_unprotect_object (s);
+ return s;
+}
+
+/* todo: property args */
+LY_DEFINE (ly_music_mutable_properties, "ly:music-mutable-properties",
+ 1, 0, 0, (SCM mus),
+ "Return an alist containing the mutable properties of @var{mus}.\n"
+ "The immutable properties are not available, since "
+ "they are constant and initialized by the "
+ "@code{make-music} function.\n")
+{
+ Music *m = unsmob_music (mus);
+ SCM_ASSERT_TYPE (m, mus, SCM_ARG1, __FUNCTION__, "music");
+ return m->get_property_alist (true);
+}
+
+LY_DEFINE (ly_music_list_p,"ly:music-list?",
+ 1, 0, 0, (SCM lst),
+ "Type predicate: return true if @var{lst} is a list "
+ "of music objects.")
+{
+ if (scm_list_p (lst) == SCM_BOOL_T)
+ while (ly_c_pair_p (lst))
+ {
+ if (!unsmob_music (ly_car (lst)))
+ return SCM_BOOL_F;
+ lst = ly_cdr (lst);
+ }
+
+ return SCM_BOOL_T;
+}
+
+LY_DEFINE (ly_deep_mus_copy, "ly:music-deep-copy",
+ 1, 0, 0, (SCM m),
+ "Copy @var{m} and all sub expressions of @var{m}")
+{
+ SCM copy = m;
+ if (unsmob_music (m))
+ {
+ copy = unsmob_music (m)->clone ()->self_scm ();
+ scm_gc_unprotect_object (copy);
+ }
+ else if (ly_c_pair_p (m))
+ copy = scm_cons (ly_deep_mus_copy (ly_car (m)),
+ ly_deep_mus_copy (ly_cdr (m)));
+ return copy;
+}
+
+LY_DEFINE (ly_music_transpose, "ly:music-transpose",
+ 2, 0, 0, (SCM m, SCM p),
+ "Transpose @var{m} such that central C is mapped to @var{p}. "
+ "Return @var{m}.")
+{
+ Music * sc = unsmob_music (m);
+ Pitch * sp = unsmob_pitch (p);
+ SCM_ASSERT_TYPE (sc, m, SCM_ARG1, __FUNCTION__, "music");
+ SCM_ASSERT_TYPE (sp, p, SCM_ARG2, __FUNCTION__, "pitch");
+
+ sc->transpose (*sp);
+ // SCM_UNDEFINED ?
+ return sc->self_scm ();
+}
+
+/*
+ TODO: should take moment factor?
+ */
+LY_DEFINE (ly_music_compress, "ly:music-compress",
+ 2, 0, 0, (SCM m, SCM factor),
+ "Compress music object @var{m} by moment @var{factor}."
+ )