lily/staff-performer.cc

   1 /*
   2   staff-performer.cc -- implement Staff_performer
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c)  1997--2000 Jan Nieuwenhuizen <janneke@gnu.org>
   7  */
   8
   9 #include "translator-group.hh"
  10 #include "debug.hh"
  11 #include "audio-column.hh"
  12 #include "audio-item.hh"
  13 #include "audio-staff.hh"
  14 #include "performer-group-performer.hh"
  15
  16 /** Perform a staff. Individual notes should have their instrument
  17   (staff-wide) set, so we override play_element()
  18
  19   */
  20 class Staff_performer : public Performer_group_performer
  21 {
  22 public:
  23   VIRTUAL_COPY_CONS(Translator);
  24
  25
  26   Staff_performer ();
  27   ~Staff_performer ();
  28
  29   String new_instrument_str ();
  30   String instrument_str_;
  31
  32 protected:
  33   virtual void play_element (Audio_element* p);
  34   virtual void finalize ();
  35   virtual void initialize ();
  36   virtual void create_audio_elements ();
  37   virtual void stop_translation_timestep ();
  38
  39 private:
  40   Audio_staff* audio_staff_p_;
  41   Audio_instrument* instrument_p_;
  42   Audio_text* instrument_name_p_;
  43   Audio_text* name_p_;
  44   Audio_tempo* tempo_p_;
  45 };
  46
  47 ADD_THIS_TRANSLATOR (Staff_performer);
  48
  49 Staff_performer::Staff_performer ()
  50 {
  51   audio_staff_p_ = 0;
  52   instrument_p_ = 0;
  53   instrument_name_p_ = 0;
  54   name_p_ = 0;
  55   tempo_p_ = 0;
  56 }
  57
  58 Staff_performer::~Staff_performer ()
  59 {
  60 }
  61
  62 void
  63 Staff_performer::initialize ()
  64 {
  65   audio_staff_p_ = new Audio_staff;
  66   announce_element (Audio_element_info (audio_staff_p_, 0));
  67
  68   name_p_ = new Audio_text (Audio_text::TRACK_NAME, id_str_);
  69   announce_element (Audio_element_info (name_p_, 0));
  70
  71   tempo_p_ = new Audio_tempo (get_tempo_i ());
  72   announce_element (Audio_element_info (tempo_p_, 0));
  73
  74   Performer_group_performer::initialize ();
  75 }
  76
  77 void
  78 Staff_performer::create_audio_elements ()
  79 {
  80   String str = new_instrument_str ();
  81   if (str.length_i ())
  82     {
  83       instrument_name_p_ = new Audio_text (Audio_text::INSTRUMENT_NAME, str);
  84       announce_element (Audio_element_info (instrument_name_p_, 0));
  85       instrument_p_ = new Audio_instrument (str);
  86       announce_element (Audio_element_info (instrument_p_, 0));
  87     }
  88 }
  89
  90 void
  91 Staff_performer::stop_translation_timestep ()
  92 {
  93   if (name_p_)
  94     {
  95       play_element (name_p_);
  96       name_p_ = 0;
  97     }
  98   if (tempo_p_)
  99     {
 100       play_element (tempo_p_);
 101       tempo_p_ = 0;
 102     }
 103   if (instrument_name_p_)
 104     {
 105       play_element (instrument_name_p_);
 106       instrument_name_p_ = 0;
 107     }
 108   if (instrument_p_)
 109     {
 110       play_element (instrument_p_);
 111       instrument_p_ = 0;
 112     }
 113   Performer_group_performer::stop_translation_timestep ();
 114 }
 115
 116 void
 117 Staff_performer::finalize ()
 118 {
 119   Performer_group_performer::finalize ();
 120   Performer::play_element (audio_staff_p_);
 121   audio_staff_p_ = 0;
 122 }
 123
 124 String
 125 Staff_performer::new_instrument_str ()
 126 {
 127   // mustn't ask Score for instrument: it will return piano!
 128   SCM minstr = get_property (ly_symbol2scm ("midiInstrument"));
 129
 130   if (!gh_string_p(minstr))
 131     minstr = get_property (ly_symbol2scm ("instrument"));
 132
 133   if (!gh_string_p (minstr)
 134       || ly_scm2string (minstr) == instrument_str_)
 135     return "";
 136
 137   instrument_str_ = ly_scm2string (minstr);
 138
 139   return instrument_str_;
 140 }
 141
 142 void
 143 Staff_performer::play_element (Audio_element* p)
 144 {
 145   if (Audio_item *ai = dynamic_cast<Audio_item *> (p))
 146     {
 147       audio_staff_p_->add_audio_item (ai);
 148     }
 149   Performer::play_element (p);
 150 }
 151