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/*
This file is part of LilyPond, the GNU music typesetter.
Copyright (C) 1998--2015 Han-Wen Nienhuys <hanwen@xs4all.nl>
LilyPond is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
LilyPond is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with LilyPond. If not, see <http://www.gnu.org/licenses/>.
*/
#include "performer.hh"
#include "audio-item.hh"
#include "context.hh"
#include "stream-event.hh"
#include "translator.icc"
#include <list>
struct Head_audio_event_tuple
{
Audio_element_info head_;
// The end moment of the note, so we can calculate a skip and check whether
// the note still goes on
Moment end_moment_;
Head_audio_event_tuple () {}
Head_audio_event_tuple (Audio_element_info h, Moment m)
{
head_ = h;
end_moment_ = m;
}
};
class Tie_performer : public Performer
{
Stream_event *event_;
list<Head_audio_event_tuple> now_heads_;
list<Head_audio_event_tuple> now_tied_heads_; // new tied notes
list<Head_audio_event_tuple> heads_to_tie_; // heads waiting for closing tie
protected:
void stop_translation_timestep ();
void start_translation_timestep ();
virtual void acknowledge_audio_element (Audio_element_info);
void process_music ();
void listen_tie (Stream_event *);
public:
TRANSLATOR_DECLARATIONS (Tie_performer);
};
Tie_performer::Tie_performer ()
{
event_ = 0;
}
void
Tie_performer::listen_tie (Stream_event *ev)
{
event_ = ev;
}
void
Tie_performer::process_music ()
{
if (event_)
context ()->set_property ("tieMelismaBusy", SCM_BOOL_T);
}
void
Tie_performer::acknowledge_audio_element (Audio_element_info inf)
{
if (Audio_note *an = dynamic_cast<Audio_note *> (inf.elem_))
{
// for each tied note, store the info and its end moment, so we can
// later on check whether (1) the note is still ongoing and (2) how
// long the skip is with tieWaitForNote
Head_audio_event_tuple inf_mom (inf, now_mom () + an->length_mom_);
if (an->tie_event_)
now_tied_heads_.push_back (inf_mom);
else
now_heads_.push_back (inf_mom);
// Find a previous note that ties to the current note. If it exists,
// remove it from the heads_to_tie vector and create the tie
list<Head_audio_event_tuple>::iterator it;
bool found = false;
Stream_event *right_mus = inf.event_;
for (it = heads_to_tie_.begin ();
!found && (it != heads_to_tie_.end ());
it++)
{
Audio_element_info et = (*it).head_;
Audio_note *th = dynamic_cast<Audio_note *> (et.elem_);
Stream_event *left_mus = et.event_;
if (th && right_mus && left_mus
&& ly_is_equal (right_mus->get_property ("pitch"),
left_mus->get_property ("pitch")))
{
found = true;
// (*it).moment_ already stores the end of the tied note!
Moment skip = now_mom () - (*it).end_moment_;
an->tie_to (th, skip);
it = heads_to_tie_.erase (it);
}
}
if (found)
return;
for (it = heads_to_tie_.begin ();
!found && (it != heads_to_tie_.end ());
it++)
{
Audio_element_info et = (*it).head_;
Audio_note *th = dynamic_cast<Audio_note *> (et.elem_);
Stream_event *left_mus = et.event_;
if (!(th && right_mus && left_mus))
continue;
SCM p1 = left_mus->get_property ("pitch");
SCM p2 = right_mus->get_property ("pitch");
if (unsmob<Pitch> (p1) && unsmob<Pitch> (p2)
&& unsmob<Pitch> (p1)->tone_pitch () == unsmob<Pitch> (p2)->tone_pitch ())
{
found = true;
// (*it).moment_ already stores the end of the tied note!
Moment skip = now_mom () - (*it).end_moment_;
an->tie_to (th, skip);
it = heads_to_tie_.erase (it);
}
}
}
}
void
Tie_performer::start_translation_timestep ()
{
context ()->set_property ("tieMelismaBusy",
ly_bool2scm (heads_to_tie_.size ()));
}
// a predicate implemented as a class, used to delete all tied notes with end
// moment in the past:
class end_moment_passed
{
protected:
Moment now;
public:
end_moment_passed (Moment mom) : now (mom) {}
bool operator () (const Head_audio_event_tuple &value)
{
return (value.end_moment_ <= now);
}
};
void
Tie_performer::stop_translation_timestep ()
{
// We might have dangling open ties like c~ d. Close them, unless the first
// note is still ongoing or we have we have tieWaitForNote set...
if (!to_boolean (get_property ("tieWaitForNote")))
{
heads_to_tie_.remove_if (end_moment_passed (now_mom ()));
}
// Append now_heads_ and now_tied_heads to heads_to_tie_ for the next time step
if (event_)
{
heads_to_tie_.splice (heads_to_tie_.end (), now_heads_);
}
heads_to_tie_.splice (heads_to_tie_.end (), now_tied_heads_);
event_ = 0;
now_heads_.clear ();
now_tied_heads_.clear ();
}
void
Tie_performer::boot ()
{
ADD_LISTENER (Tie_performer, tie);
}
ADD_TRANSLATOR (Tie_performer,
/* doc */
"Generate ties between note heads of equal pitch.",
/* create */
"",
/* read */
"tieWaitForNote",
/* write */
"tieMelismaBusy"
);
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