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--2009 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.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_info info);
  30   virtual void finalize ();
  31   virtual void initialize ();
  32   void process_music ();
  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                 /* doc */
  47                 "",
  48
  49                 /* create */
  50                 "",
  51
  52                 /* read */
  53                 "",
  54
  55                 /* write */
  56                 "");
  57
  58 Staff_performer::Staff_performer ()
  59 {
  60   audio_staff_ = 0;
  61   instrument_ = 0;
  62   instrument_name_ = 0;
  63   name_ = 0;
  64   tempo_ = 0;
  65 }
  66
  67 Staff_performer::~Staff_performer ()
  68 {
  69 }
  70
  71 void
  72 Staff_performer::initialize ()
  73 {
  74   audio_staff_ = new Audio_staff;
  75   name_ = new Audio_text (Audio_text::TRACK_NAME, context ()->id_string ());
  76
  77   audio_staff_->add_audio_item (name_);
  78
  79   announce_element (Audio_element_info (audio_staff_, 0));
  80   announce_element (Audio_element_info (name_, 0));
  81 }
  82
  83 void
  84 Staff_performer::process_music ()
  85 {
  86   string str = new_instrument_string ();
  87   if (str.length ())
  88     {
  89       instrument_name_ = new Audio_text (Audio_text::INSTRUMENT_NAME, str);
  90       announce_element (Audio_element_info (instrument_name_, 0));
  91       instrument_ = new Audio_instrument (str);
  92       announce_element (Audio_element_info (instrument_, 0));
  93
  94       audio_staff_->add_audio_item (instrument_);
  95       audio_staff_->add_audio_item (instrument_name_);
  96
  97       /*
  98         Have to be here before notes arrive into the staff.
  99       */
 100     }
 101 }
 102
 103 void
 104 Staff_performer::stop_translation_timestep ()
 105 {
 106   SCM proc = ly_lily_module_constant ("percussion?");
 107
 108   SCM drums = scm_call_1 (proc, ly_symbol2scm (instrument_string_.c_str ()));
 109   audio_staff_->channel_ = (drums == SCM_BOOL_T ? 9 : -1);
 110   if (name_)
 111     {
 112       name_ = 0;
 113     }
 114   if (tempo_)
 115     {
 116       tempo_ = 0;
 117     }
 118   instrument_name_ = 0;
 119   instrument_ = 0;
 120 }
 121
 122 void
 123 Staff_performer::finalize ()
 124 {
 125   audio_staff_ = 0;
 126 }
 127
 128 string
 129 Staff_performer::new_instrument_string ()
 130 {
 131   // mustn't ask Score for instrument: it will return piano!
 132   SCM minstr = get_property ("midiInstrument");
 133
 134   if (!scm_is_string (minstr)
 135       || ly_scm2string (minstr) == instrument_string_)
 136     return "";
 137
 138   instrument_string_ = ly_scm2string (minstr);
 139
 140   return instrument_string_;
 141 }
 142
 143 void
 144 Staff_performer::acknowledge_audio_element (Audio_element_info inf)
 145 {
 146   if (Audio_item *ai = dynamic_cast<Audio_item *> (inf.elem_))
 147     audio_staff_->add_audio_item (ai);
 148 }
 149