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--2005 Jan Nieuwenhuizen <janneke@gnu.org>
   7 */
   8
   9 #include "warn.hh"
  10 #include "audio-column.hh"
  11 #include "audio-item.hh"
  12 #include "audio-staff.hh"
  13 #include "performer-group-performer.hh"
  14 #include "context.hh"
  15
  16 /** Perform a staff. Individual notes should have their instrument
  17     (staff-wide) set, so we override play_element ()
  18 */
  19 class Staff_performer : public Performer
  20 {
  21 public:
  22   TRANSLATOR_DECLARATIONS (Staff_performer);
  23   ~Staff_performer ();
  24
  25   String new_instrument_string ();
  26   String instrument_string_;
  27
  28 protected:
  29   virtual void acknowledge_audio_element (Audio_element *p);
  30   virtual void finalize ();
  31   virtual void initialize ();
  32   virtual void create_audio_elements ();
  33   void stop_translation_timestep ();
  34
  35 private:
  36   Audio_staff *audio_staff_;
  37   Audio_instrument *instrument_;
  38   Audio_text *instrument_name_;
  39   Audio_text *name_;
  40   Audio_tempo *tempo_;
  41 };
  42
  43 #include "translator.icc"
  44
  45 ADD_TRANSLATOR (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, 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
  75 void
  76 Staff_performer::create_audio_elements ()
  77 {
  78   String str = new_instrument_string ();
  79   if (str.length ())
  80     {
  81       instrument_name_ = new Audio_text (Audio_text::INSTRUMENT_NAME, str);
  82       announce_element (Audio_element_info (instrument_name_, 0));
  83       instrument_ = new Audio_instrument (str);
  84       announce_element (Audio_element_info (instrument_, 0));
  85
  86       /*
  87         Have to be here before notes arrive into the staff.
  88       */
  89       play_element (instrument_);
  90       play_element (instrument_name_);
  91     }
  92 }
  93
  94 void
  95 Staff_performer::stop_translation_timestep ()
  96 {
  97   SCM proc = ly_lily_module_constant ("percussion?");
  98
  99   SCM drums = scm_call_1 (proc, ly_symbol2scm (instrument_string_.to_str0 ()));
 100   audio_staff_->channel_ = (drums == SCM_BOOL_T ? 9 : -1);
 101   if (name_)
 102     {
 103       play_element (name_);
 104       name_ = 0;
 105     }
 106   if (tempo_)
 107     {
 108       play_element (tempo_);
 109       tempo_ = 0;
 110     }
 111   instrument_name_ = 0;
 112   instrument_ = 0;
 113 }
 114
 115 void
 116 Staff_performer::finalize ()
 117 {
 118   Performer::play_element (audio_staff_);
 119   audio_staff_ = 0;
 120 }
 121
 122 String
 123 Staff_performer::new_instrument_string ()
 124 {
 125   // mustn't ask Score for instrument: it will return piano!
 126   SCM minstr = get_property ("midiInstrument");
 127
 128   if (!scm_is_string (minstr)
 129       || ly_scm2string (minstr) == instrument_string_)
 130     return "";
 131
 132   instrument_string_ = ly_scm2string (minstr);
 133
 134   return instrument_string_;
 135 }
 136
 137 void
 138 Staff_performer::acknowledge_audio_element (Audio_element *p)
 139 {
 140   if (Audio_item *ai = dynamic_cast<Audio_item *> (p))
 141     {
 142       audio_staff_->add_audio_item (ai);
 143     }
 144 }
 145