lily/dynamic-performer.cc

   1 /*
   2   dynamic-performer.cc -- implement Dynamic_performer
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 2000--2004 Jan Nieuwenhuizen <janneke@gnu.org>
   7 */
   8
   9 #include "performer.hh"
  10
  11 #include "event.hh"
  12 #include "audio-item.hh"
  13
  14 /*
  15   TODO:
  16
  17     handle multiple events
  18
  19     perform absolute (text) dynamics
  20  */
  21 class Dynamic_performer : public Performer
  22 {
  23 public:
  24   TRANSLATOR_DECLARATIONS (Dynamic_performer);
  25 protected:
  26   virtual bool try_music (Music* req);
  27   virtual void stop_translation_timestep ();
  28   virtual void create_audio_elements ();
  29
  30 private:
  31   Music* script_req_;
  32   Audio_dynamic* audio_;
  33 };
  34
  35 Dynamic_performer::Dynamic_performer ()
  36 {
  37   script_req_ = 0;
  38   audio_ = 0;
  39 }
  40
  41 void
  42 Dynamic_performer::create_audio_elements ()
  43 {
  44   if (script_req_)
  45     {
  46       SCM proc = get_property ("dynamicAbsoluteVolumeFunction");
  47
  48       SCM svolume  = SCM_EOL;
  49       if (gh_procedure_p (proc))
  50         {
  51           // urg
  52           svolume = gh_call1 (proc, script_req_->get_property ("text"));
  53         }
  54
  55       Real volume = robust_scm2double (svolume, 0.5);
  56
  57       /*
  58         properties override default equaliser setting
  59        */
  60       SCM min = get_property ("midiMinimumVolume");
  61       SCM max = get_property ("midiMaximumVolume");
  62       if (gh_number_p (min) || gh_number_p (max))
  63         {
  64           Interval iv (0, 1);
  65           if (gh_number_p (min))
  66             iv[MIN] = gh_scm2double (min);
  67           if (gh_number_p (max))
  68             iv[MAX] = gh_scm2double (max);
  69           volume = iv[MIN] + iv.length () * volume;
  70         }
  71       else
  72         {
  73           /*
  74             urg, code duplication:: staff_performer
  75           */
  76           SCM s = get_property ("midiInstrument");
  77
  78           if (!gh_string_p (s))
  79             s = get_property ("instrument");
  80
  81           if (!gh_string_p (s))
  82             s = scm_makfrom0str ("piano");
  83
  84
  85           SCM eq = get_property ("instrumentEqualizer");
  86           if (gh_procedure_p (eq))
  87             {
  88               s = gh_call1 (eq, s);
  89             }
  90
  91           if (is_number_pair (s))
  92             {
  93               Interval iv = ly_scm2interval (s);
  94               volume = iv[MIN] + iv.length () * volume;
  95             }
  96         }
  97
  98       audio_ = new Audio_dynamic (volume);
  99       Audio_element_info info (audio_, script_req_);
 100       announce_element (info);
 101       script_req_ = 0;
 102     }
 103 }
 104
 105 void
 106 Dynamic_performer::stop_translation_timestep ()
 107 {
 108   if (audio_)
 109     {
 110       play_element (audio_);
 111       audio_ = 0;
 112     }
 113 }
 114
 115 bool
 116 Dynamic_performer::try_music (Music* r)
 117 {
 118   if (!script_req_)
 119     {
 120       if (r->is_mus_type ("absolute-dynamic-event")) // fixme.
 121         {
 122           script_req_ = r;
 123           return true;
 124         }
 125     }
 126   return false;
 127 }
 128
 129 ENTER_DESCRIPTION (Dynamic_performer,
 130                   /*descr*/               "",
 131                   /* creats*/ "",
 132                   /* accepts */     "absolute-dynamic-event",
 133                   /* acks */ "",
 134                   /*reads */"dynamicAbsoluteVolumeFunction midiMaximumVolume midiMinimumVolume midiInstrument instrumentEqualizer",
 135                   /*writes*/"");