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 Jan Nieuwenhuizen <janneke@gnu.org>
   7 */
   8
   9 #include "performer.hh"
  10 #include "command-request.hh"
  11 #include "musical-request.hh"
  12 #include "audio-item.hh"
  13
  14 /*
  15   TODO:
  16     handle multiple requests
  17  */
  18
  19 /**
  20    perform absolute (text) dynamics
  21  */
  22 class Dynamic_performer : public Performer
  23 {
  24 public:
  25   TRANSLATOR_DECLARATIONS(Dynamic_performer);
  26 protected:
  27   virtual bool try_music (Music* req);
  28   virtual void stop_translation_timestep ();
  29   virtual void create_audio_elements ();
  30
  31 private:
  32   Music* script_req_;
  33   Audio_dynamic* audio_;
  34 };
  35
  36
  37
  38 Dynamic_performer::Dynamic_performer ()
  39 {
  40   script_req_ = 0;
  41   audio_ = 0;
  42 }
  43
  44 void
  45 Dynamic_performer::create_audio_elements ()
  46 {
  47   if (script_req_)
  48     {
  49       SCM proc = get_property ("dynamicAbsoluteVolumeFunction");
  50
  51       SCM svolume  = SCM_EOL;
  52       if (gh_procedure_p (proc))
  53         {
  54           // urg
  55           svolume = gh_call1 (proc, script_req_->get_mus_property ("text"));
  56         }
  57
  58       Real volume = 0.5;
  59       if (gh_number_p (svolume))
  60         volume = gh_scm2double (svolume);
  61
  62       /*
  63         properties override default equaliser setting
  64        */
  65       SCM min = get_property ("midiMinimumVolume");
  66       SCM max = get_property ("midiMaximumVolume");
  67       if (gh_number_p (min) || gh_number_p (max))
  68         {
  69           Interval iv (0, 1);
  70           if (gh_number_p (min))
  71             iv[MIN] = gh_scm2double (min);
  72           if (gh_number_p (max))
  73             iv[MAX] = gh_scm2double (max);
  74           volume = iv[MIN] + iv.length () * volume;
  75         }
  76       else
  77         {
  78           /*
  79             urg, code duplication:: staff_performer
  80           */
  81           SCM s = get_property ("midiInstrument");
  82
  83           if (!gh_string_p (s))
  84             s = get_property ("instrument");
  85
  86           if (!gh_string_p (s))
  87             s = scm_makfrom0str ("piano");
  88
  89
  90           SCM eq = get_property ("instrumentEqualizer");
  91           if (gh_procedure_p (eq))
  92             {
  93               s = gh_call1 (eq, s);
  94             }
  95
  96           if (gh_pair_p (s))
  97             {
  98               Interval iv;
  99               iv[MIN] = gh_scm2double (ly_car (s));
 100               iv[MAX] = gh_scm2double (ly_cdr (s));
 101               volume = iv[MIN] + iv.length () * volume;
 102             }
 103         }
 104
 105       audio_ = new Audio_dynamic (volume);
 106       Audio_element_info info (audio_, script_req_);
 107       announce_element (info);
 108       script_req_ = 0;
 109     }
 110 }
 111
 112 void
 113 Dynamic_performer::stop_translation_timestep ()
 114 {
 115   if (audio_)
 116     {
 117       play_element (audio_);
 118       audio_ = 0;
 119     }
 120 }
 121
 122 bool
 123 Dynamic_performer::try_music (Music* r)
 124 {
 125   if (!script_req_)
 126     {
 127       if (dynamic_cast <Text_script_req*> (r)
 128           && r->get_mus_property ("text-type") == ly_symbol2scm ("dynamic"))
 129         {
 130           script_req_ = r;
 131           return true;
 132         }
 133     }
 134   return false;
 135 }
 136
 137 ENTER_DESCRIPTION(Dynamic_performer,
 138                   "","","","dynamicAbsoluteVolumeFunction midiMaximumVolume midiMinimumVolume midiInstrument instrumentEqualizer","");