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--2003 Jan Nieuwenhuizen <janneke@gnu.org>
   7  */
   8
   9 #include "translator-group.hh"
  10 #include "warn.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   TRANSLATOR_DECLARATIONS(Staff_performer);
  24   ~Staff_performer ();
  25
  26   String new_instrument_string ();
  27   String instrument_string_;
  28
  29 protected:
  30   virtual void play_element (Audio_element* p);
  31   virtual void finalize ();
  32   virtual void initialize ();
  33   virtual void create_audio_elements ();
  34   virtual void stop_translation_timestep ();
  35
  36 private:
  37   Audio_staff* audio_staff_;
  38   Audio_instrument* instrument_;
  39   Audio_text* instrument_name_;
  40   Audio_text* name_;
  41   Audio_tempo* tempo_;
  42 };
  43
  44 ENTER_DESCRIPTION (Staff_performer, "", "",
  45                    "",
  46                    "", "", "");
  47
  48 Staff_performer::Staff_performer ()
  49 {
  50   audio_staff_ = 0;
  51   instrument_ = 0;
  52   instrument_name_ = 0;
  53   name_ = 0;
  54   tempo_ = 0;
  55 }
  56
  57 Staff_performer::~Staff_performer ()
  58 {
  59 }
  60
  61 void
  62 Staff_performer::initialize ()
  63 {
  64   audio_staff_ = new Audio_staff;
  65   announce_element (Audio_element_info (audio_staff_, 0));
  66
  67   name_ = new Audio_text (Audio_text::TRACK_NAME, id_string_);
  68   announce_element (Audio_element_info (name_, 0));
  69
  70   tempo_ = new Audio_tempo (get_tempo ());
  71   announce_element (Audio_element_info (tempo_, 0));
  72
  73   Performer_group_performer::initialize ();
  74 }
  75
  76 void
  77 Staff_performer::create_audio_elements ()
  78 {
  79   String str = new_instrument_string ();
  80   if (str.length ())
  81     {
  82       instrument_name_ = new Audio_text (Audio_text::INSTRUMENT_NAME, str);
  83       announce_element (Audio_element_info (instrument_name_, 0));
  84       instrument_ = new Audio_instrument (str);
  85       announce_element (Audio_element_info (instrument_, 0));
  86     }
  87   Performer_group_performer::create_audio_elements ();
  88 }
  89
  90 void
  91 Staff_performer::stop_translation_timestep ()
  92 {
  93   /*
  94     UGH. -> don't use eval.
  95   */
  96
  97   SCM proc = scm_primitive_eval (ly_symbol2scm ("percussion?"));
  98   SCM drums = gh_call1 (proc, ly_symbol2scm (instrument_string_.to_str0 ()));
  99   audio_staff_->channel_ = (drums == SCM_BOOL_T ? 9 : -1 );
 100   if (name_)
 101     {
 102       play_element (name_);
 103       name_ = 0;
 104     }
 105   if (tempo_)
 106     {
 107       play_element (tempo_);
 108       tempo_ = 0;
 109     }
 110   if (instrument_name_)
 111     {
 112       play_element (instrument_name_);
 113       instrument_name_ = 0;
 114     }
 115   if (instrument_)
 116     {
 117       play_element (instrument_);
 118       instrument_ = 0;
 119     }
 120   Performer_group_performer::stop_translation_timestep ();
 121 }
 122
 123 void
 124 Staff_performer::finalize ()
 125 {
 126   Performer_group_performer::finalize ();
 127   Performer::play_element (audio_staff_);
 128   audio_staff_ = 0;
 129 }
 130
 131 String
 132 Staff_performer::new_instrument_string ()
 133 {
 134   // mustn't ask Score for instrument: it will return piano!
 135   SCM minstr = get_property ("midiInstrument");
 136
 137   if (!gh_string_p (minstr))
 138     minstr = get_property ("instrument");
 139
 140   if (!gh_string_p (minstr)
 141       || ly_scm2string (minstr) == instrument_string_)
 142     return "";
 143
 144   instrument_string_ = ly_scm2string (minstr);
 145
 146   return instrument_string_;
 147 }
 148
 149 void
 150 Staff_performer::play_element (Audio_element* p)
 151 {
 152   if (Audio_item *ai = dynamic_cast<Audio_item *> (p))
 153     {
 154       audio_staff_->add_audio_item (ai);
 155     }
 156   Performer::play_element (p);
 157 }
 158