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/*
midi-walker.cc -- implement Midi_walker
source file of the GNU LilyPond music typesetter
(c) 1997--2007 Han-Wen Nienhuys <hanwen@xs4all.nl>
Jan Nieuwenhuizen <janneke@gnu.org>
*/
#include "midi-walker.hh"
#include "audio-column.hh"
#include "audio-staff.hh"
#include "midi-item.hh"
#include "midi-chunk.hh"
#include "midi-stream.hh"
#include "warn.hh"
Midi_note_event::Midi_note_event ()
{
ignore_ = false;
}
int
compare (Midi_note_event const &left, Midi_note_event const &right)
{
Moment m = (left.key - right.key);
if (m < 0)
return -1;
else if (m > 0)
return 1;
else
return 0;
}
bool
audio_item_less (Audio_item * const a,
Audio_item * const b)
{
return a->get_column ()->when_ < b->get_column ()->when_;
}
Midi_walker::Midi_walker (Audio_staff *audio_staff, Midi_track *track,
int channel)
{
channel_ = channel;
track_ = track;
index_ = 0;
items_ = audio_staff->audio_items_;
vector_sort (items_, audio_item_less);
last_tick_ = 0;
}
Midi_walker::~Midi_walker ()
{
junk_pointers (midi_events_);
}
void
Midi_walker::finalize ()
{
do_stop_notes (INT_MAX);
}
/**
Find out if start_note event is needed, and do it if needed.
*/
void
Midi_walker::do_start_note (Midi_note *note)
{
Audio_item *ptr = items_[index_];
assert (note->audio_ == ptr);
int stop_ticks = int (moment_to_real (note->audio_->length_mom_) * Real (384 * 4))
+ ptr->audio_column_->ticks ();
bool play_start = true;
for (vsize i = 0; i < stop_note_queue.size (); i++)
{
/* if this pith already in queue */
if (stop_note_queue[i].val->get_semitone_pitch ()
== note->get_semitone_pitch ())
{
if (stop_note_queue[i].key < stop_ticks)
{
/* let stopnote in queue be ignored,
new stop note wins */
stop_note_queue[i].ignore_ = true;
/* don't replay start note, */
play_start = false;
break;
}
else
{
/* skip this stopnote,
don't play the start note */
note = 0;
break;
}
}
}
if (note)
{
Midi_note_event e;
e.val = new Midi_note_off (note);
midi_events_.push_back (e.val);
e.key = int (stop_ticks);
stop_note_queue.insert (e);
if (play_start)
output_event (ptr->audio_column_->ticks (), note);
}
}
void
Midi_walker::do_stop_notes (int max_ticks)
{
while (stop_note_queue.size () && stop_note_queue.front ().key <= max_ticks)
{
Midi_note_event e = stop_note_queue.get ();
if (e.ignore_)
{
continue;
}
int stop_ticks = e.key;
Midi_note *note = e.val;
output_event (stop_ticks, note);
}
}
void
Midi_walker::output_event (int now_ticks, Midi_item *l)
{
int delta_ticks = now_ticks - last_tick_;
last_tick_ = now_ticks;
/*
this is not correct, but at least it doesn't crash when you
start with graces
*/
if (delta_ticks < 0)
{
programming_error ("Going back in MIDI time.");
delta_ticks = 0;
}
track_->add (delta_ticks, l);
}
void
Midi_walker::process ()
{
Audio_item *audio = items_[index_];
do_stop_notes (audio->audio_column_->ticks ());
if (Midi_item *midi = get_midi (audio))
{
if (Midi_channel_item *mci = dynamic_cast<Midi_channel_item*> (midi))
mci->channel_ = channel_;
if (Midi_note *note = dynamic_cast<Midi_note *> (midi))
{
if (note->audio_->length_mom_.to_bool ())
do_start_note (note);
}
else
output_event (audio->audio_column_->ticks (), midi);
}
}
Midi_item*
Midi_walker::get_midi (Audio_item *i)
{
Midi_item *mi = Midi_item::get_midi (i);
midi_events_.push_back (mi);
return mi;
}
bool
Midi_walker::ok () const
{
return index_ < items_.size ();
}
void
Midi_walker::operator ++ (int)
{
assert (ok ());
index_++;
}
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