lily/span-dynamic-performer.cc

   1 /*
   2   span-dynamic-performer.cc -- implement Span_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 struct Audio_dynamic_tuple
  15 {
  16   Audio_dynamic* audio_l_;
  17   Moment mom_;
  18 };
  19
  20 /**
  21    perform span-dynamics
  22  */
  23 class Span_dynamic_performer : public Performer
  24 {
  25 public:
  26   VIRTUAL_COPY_CONS (Translator);
  27
  28   Span_dynamic_performer ();
  29
  30 protected:
  31   virtual bool do_try_music (Music* req_l);
  32   virtual void acknowledge_element (Audio_element_info);
  33   virtual void do_process_music ();
  34   virtual void do_pre_move_processing ();
  35   virtual void do_post_move_processing ();
  36
  37 private:
  38   Audio_dynamic* audio_p_;
  39   Span_req* span_start_req_l_;
  40   Drul_array<Span_req*> span_req_l_drul_;
  41   Array<Audio_dynamic_tuple> dynamic_tuple_arr_;
  42   Array<Audio_dynamic_tuple> finished_dynamic_tuple_arr_;
  43   Direction finished_dir_;
  44 };
  45
  46 ADD_THIS_TRANSLATOR (Span_dynamic_performer);
  47
  48 Span_dynamic_performer::Span_dynamic_performer ()
  49 {
  50   span_req_l_drul_[START] = 0;
  51   span_req_l_drul_[STOP] = 0;
  52   span_start_req_l_ = 0;
  53   audio_p_ = 0;
  54 }
  55
  56 void
  57 Span_dynamic_performer::acknowledge_element (Audio_element_info i)
  58 {
  59   if (Audio_dynamic * d = dynamic_cast <Audio_dynamic*> (i.elem_l_))
  60     {
  61       Audio_dynamic_tuple a = { d, now_mom () };
  62       if (!span_req_l_drul_[START])
  63         dynamic_tuple_arr_.clear ();
  64       dynamic_tuple_arr_.push (a);
  65       if (finished_dynamic_tuple_arr_.size ())
  66         finished_dynamic_tuple_arr_.push (a);
  67     }
  68 }
  69
  70 void
  71 Span_dynamic_performer::do_process_music ()
  72 {
  73   if (finished_dynamic_tuple_arr_.size () > 1
  74      && finished_dynamic_tuple_arr_.top ().audio_l_->volume_i_)
  75     {
  76       Real start_volume = finished_dynamic_tuple_arr_[0].audio_l_->volume_i_;
  77       Real dv = finished_dynamic_tuple_arr_.top ().audio_l_->volume_i_
  78         - start_volume;
  79       /*
  80         urg.
  81         Catch and fix the case of:
  82
  83              |                         |
  84             x|                        x|
  85             f cresc.  -- -- -- -- --  pp
  86
  87          Actually, we should provide a non-displayed dynamic/volume setting,
  88          to set volume to 'ff' just before the pp.
  89        */
  90       if (!dv || sign (dv) != finished_dir_)
  91         {
  92           // urg.  about one volume step
  93           dv = (int)finished_dir_ * 13;
  94           if (!start_volume)
  95             start_volume = finished_dynamic_tuple_arr_.top
  96               ().audio_l_->volume_i_ - dv;
  97         }
  98       Moment start_mom = finished_dynamic_tuple_arr_[0].mom_;
  99       Moment dt = finished_dynamic_tuple_arr_.top ().mom_ - start_mom;
 100       for (int i=0; i < finished_dynamic_tuple_arr_.size (); i++)
 101         {
 102           Audio_dynamic_tuple* a = &finished_dynamic_tuple_arr_[i];
 103           Real volume = start_volume + dv * (Real)(a->mom_ - start_mom)
 104             / (Real)dt;
 105           a->audio_l_->volume_i_ = (int)volume;
 106         }
 107       finished_dynamic_tuple_arr_.clear ();
 108     }
 109
 110   if (span_req_l_drul_[STOP])
 111     {
 112       if (!span_start_req_l_)
 113         {
 114           span_req_l_drul_[STOP]->warning (_ ("can't find start of (de)crescendo"));
 115         }
 116       else
 117         {
 118           span_start_req_l_ = 0;
 119           finished_dynamic_tuple_arr_ = dynamic_tuple_arr_;
 120           finished_dir_ = span_req_l_drul_[STOP]->span_type_str_ == "crescendo"
 121             ? RIGHT : LEFT;
 122           dynamic_tuple_arr_.clear ();
 123           if (finished_dynamic_tuple_arr_.size ())
 124             dynamic_tuple_arr_.push (finished_dynamic_tuple_arr_.top ());
 125         }
 126     }
 127
 128   if (span_req_l_drul_[START])
 129     {
 130       span_start_req_l_ = span_req_l_drul_[START];
 131       audio_p_ = new Audio_dynamic (0);
 132       Audio_element_info info (audio_p_, 0);
 133       announce_element (info);
 134
 135       Audio_dynamic_tuple a = { audio_p_, now_mom () };
 136       dynamic_tuple_arr_.push (a);
 137     }
 138 }
 139
 140 void
 141 Span_dynamic_performer::do_pre_move_processing ()
 142 {
 143   if (audio_p_)
 144     {
 145       play_element (audio_p_);
 146       audio_p_ = 0;
 147     }
 148 }
 149
 150 void
 151 Span_dynamic_performer::do_post_move_processing ()
 152 {
 153   span_req_l_drul_[STOP] = 0;
 154   span_req_l_drul_[START] = 0;
 155 }
 156
 157 bool
 158 Span_dynamic_performer::do_try_music (Music* r)
 159 {
 160   if (Span_req * s = dynamic_cast<Span_req*>(r))
 161     {
 162       if (s-> span_type_str_ == "crescendo"
 163           || s->span_type_str_ == "decrescendo")
 164         {
 165           span_req_l_drul_[s->span_dir_] = s;
 166           return true;
 167         }
 168     }
 169   return false;
 170 }