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--2004 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 #include "context.hh"
  16
  17 /** Perform a staff. Individual notes should have their instrument
  18  (staff-wide) set, so we override play_element ()
  19
  20   */
  21 class Staff_performer : public Performer_group_performer
  22 {
  23 public:
  24   TRANSLATOR_DECLARATIONS (Staff_performer);
  25   ~Staff_performer ();
  26
  27   String new_instrument_string ();
  28   String instrument_string_;
  29
  30 protected:
  31   virtual void play_element (Audio_element* p);
  32   virtual void finalize ();
  33   virtual void initialize ();
  34   virtual void create_audio_elements ();
  35   virtual void stop_translation_timestep ();
  36
  37 private:
  38   Audio_staff* audio_staff_;
  39   Audio_instrument* instrument_;
  40   Audio_text* instrument_name_;
  41   Audio_text* name_;
  42   Audio_tempo* tempo_;
  43 };
  44
  45 ENTER_DESCRIPTION (Staff_performer, "", "",
  46                    "",
  47                    "", "", "");
  48
  49 Staff_performer::Staff_performer ()
  50 {
  51   audio_staff_ = 0;
  52   instrument_ = 0;
  53   instrument_name_ = 0;
  54   name_ = 0;
  55   tempo_ = 0;
  56 }
  57
  58 Staff_performer::~Staff_performer ()
  59 {
  60 }
  61
  62 void
  63 Staff_performer::initialize ()
  64 {
  65   audio_staff_ = new Audio_staff;
  66   announce_element (Audio_element_info (audio_staff_, 0));
  67
  68   name_ = new Audio_text (Audio_text::TRACK_NAME, daddy_context_->id_string_);
  69   announce_element (Audio_element_info (name_, 0));
  70
  71   tempo_ = new Audio_tempo (get_tempo ());
  72   announce_element (Audio_element_info (tempo_, 0));
  73
  74   Performer_group_performer::initialize ();
  75 }
  76
  77 void
  78 Staff_performer::create_audio_elements ()
  79 {
  80   String str = new_instrument_string ();
  81   if (str.length ())
  82     {
  83       instrument_name_ = new Audio_text (Audio_text::INSTRUMENT_NAME, str);
  84       announce_element (Audio_element_info (instrument_name_, 0));
  85       instrument_ = new Audio_instrument (str);
  86       announce_element (Audio_element_info (instrument_, 0));
  87     }
  88   Performer_group_performer::create_audio_elements ();
  89 }
  90
  91 void
  92 Staff_performer::stop_translation_timestep ()
  93 {
  94   static SCM proc;
  95   if (!proc)
  96     proc = scm_primitive_eval (ly_symbol2scm ("percussion?"));
  97
  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       || ly_scm2string (minstr) == instrument_string_)
 139     return "";
 140
 141   instrument_string_ = ly_scm2string (minstr);
 142
 143   return instrument_string_;
 144 }
 145
 146 void
 147 Staff_performer::play_element (Audio_element* p)
 148 {
 149   if (Audio_item *ai = dynamic_cast<Audio_item *> (p))
 150     {
 151       audio_staff_->add_audio_item (ai);
 152     }
 153   Performer::play_element (p);
 154 }
 155