lily/performance.cc

   1 /*
   2   performance.cc -- implement Performance
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 1997--2005 Jan Nieuwenhuizen <janneke@gnu.org>
   7 */
   8
   9 #include "performance.hh"
  10
  11 #include <ctime>
  12
  13 #include "audio-column.hh"
  14 #include "audio-staff.hh"
  15 #include "file-name.hh"
  16 #include "lily-version.hh"
  17 #include "main.hh"
  18 #include "midi-item.hh"
  19 #include "midi-stream.hh"
  20 #include "score.hh"
  21 #include "string-convert.hh"
  22 #include "warn.hh"
  23
  24 #include "killing-cons.tcc"
  25
  26 Performance::Performance ()
  27 {
  28   midi_ = 0;
  29   audio_element_list_ = 0;
  30 }
  31
  32 Performance::~Performance ()
  33 {
  34   delete audio_element_list_;
  35 }
  36
  37 void
  38 Performance::output (Midi_stream &midi_stream)
  39 {
  40   int tracks_i = audio_staffs_.size () + 1;
  41
  42   // ugh
  43   int clocks_per_4_i = 384;
  44
  45   midi_stream << Midi_header (1, tracks_i, clocks_per_4_i);
  46   output_header_track (midi_stream);
  47   message (_ ("Track...") + " ");
  48   int channel = 0;
  49   for (int i = 0; i < audio_staffs_.size (); i++)
  50     {
  51       Audio_staff *s = audio_staffs_[i];
  52       if (be_verbose_global)
  53         progress_indication ("[" + to_string (i));
  54
  55       /*
  56         MIDI players tend to ignore instrument settings on
  57         channel 10, the percussion channel by default.
  58       */
  59       if (channel % 16 == 9)
  60         channel++;
  61
  62       /*
  63         Huh? Why does each staff also have a separate channel? We
  64         should map channels to voices, not staves. --hwn.
  65       */
  66       if (s->channel_ < 0)
  67         {
  68           s->channel_ = channel % 16;
  69           if (channel > 15)
  70             {
  71               warning (_ ("MIDI channel wrapped around"));
  72               warning (_ ("remapping modulo 16"));
  73             }
  74         }
  75
  76       s->output (midi_stream, channel++);
  77       if (be_verbose_global)
  78         progress_indication ("]");
  79     }
  80 }
  81
  82 void
  83 Performance::output_header_track (Midi_stream &midi_stream)
  84 {
  85   Midi_track midi_track;
  86
  87   midi_track.channel_ = 9;
  88
  89   // perhaps multiple text events?
  90   String id_string;
  91   String str = String (_ ("Creator: "));
  92   id_string = String_convert::pad_to (gnu_lilypond_version_string (), 30);
  93   str += id_string;
  94
  95   /*
  96     This seems silly, but in fact the audio elements should
  97     be generated elsewhere: not midi-specific.
  98   */
  99   Audio_text creator_a (Audio_text::TEXT, str);
 100   Midi_text creator (&creator_a);
 101   midi_track.add (Moment (0), &creator);
 102
 103   /* Better not translate this */
 104   str = "Generated automatically by: ";
 105   str += id_string;
 106
 107   Audio_text generate_a (Audio_text::TEXT, str);
 108   Midi_text generate (&generate_a);
 109   midi_track.add (Moment (0), &generate);
 110
 111   str = _ ("at ");
 112   time_t t (time (0));
 113   str += ctime (&t);
 114   str = str.left_string (str.length () - 1);
 115   str = String_convert::pad_to (str, 60);
 116
 117   Audio_text at_a (Audio_text::TEXT, str);
 118   Midi_text at (&at_a);
 119   midi_track.add (Moment (0), &at);
 120
 121   // TODO:
 122   //  str = _f ("from musical definition: %s", origin_string_);
 123
 124   Audio_text from_a (Audio_text::TEXT, str);
 125   Midi_text from (&from_a);
 126   midi_track.add (Moment (0), &from);
 127
 128   Audio_text track_name_a (Audio_text::TRACK_NAME, "Track "
 129                            + String_convert::int2dec (0, 0, '0'));
 130   Midi_text track_name (&track_name_a);
 131
 132   midi_track.add (Moment (0), &track_name);
 133
 134   // Some sequencers read track 0 last.
 135   //  Audio_tempo tempo_a (midi_->get_tempo (Moment (Rational (1, 4))));
 136   //  Midi_tempo tempo (&tempo_a);
 137   //  midi_track.add (Moment (0), &tempo);
 138
 139   midi_stream << midi_track;
 140 }
 141
 142 void
 143 Performance::add_element (Audio_element *p)
 144 {
 145   if (Audio_staff *s = dynamic_cast<Audio_staff *> (p))
 146     audio_staffs_.push (s);
 147   audio_element_list_ = new Killing_cons<Audio_element> (p, audio_element_list_);
 148 }
 149
 150 void
 151 Performance::write_output (String out)
 152 {
 153   if (out == "-")
 154     out = "lelie.midi";
 155
 156   /* Maybe a bit crude, but we had this before */
 157   File_name file_name (out);
 158   file_name.ext_ = "midi";
 159   out = file_name.to_string ();
 160
 161   Midi_stream midi_stream (out);
 162   message (_f ("MIDI output to `%s'...", out));
 163
 164   output (midi_stream);
 165   progress_indication ("\n");
 166 }
 167