lily/performance.cc

   1 /*
   2   performance.cc -- implement Performance
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 1997--2004 Jan Nieuwenhuizen <janneke@gnu.org>
   7 */
   8
   9 #include <time.h>
  10
  11 #include "audio-column.hh"
  12 #include "audio-item.hh"
  13 #include "audio-staff.hh"
  14 #include "file-name.hh"
  15 #include "lily-version.hh"
  16 #include "main.hh"
  17 #include "midi-item.hh"
  18 #include "midi-stream.hh"
  19 #include "performance.hh"
  20 #include "score.hh"
  21 #include "string-convert.hh"
  22 #include "string.hh"
  23 #include "warn.hh"
  24
  25 #include "killing-cons.tcc"
  26
  27 Performance::Performance ()
  28 {
  29   midi_ =0;
  30   audio_elem_p_list_ = 0;
  31 }
  32
  33
  34 Performance::~Performance ()
  35 {
  36   delete audio_elem_p_list_;
  37 }
  38
  39 void
  40 Performance::output (Midi_stream& midi_stream)
  41 {
  42   int tracks_i = audio_staffs_.size () + 1;
  43
  44   // ugh
  45   int clocks_per_4_i = 384;
  46
  47   midi_stream << Midi_header (1, tracks_i, clocks_per_4_i);
  48   output_header_track (midi_stream);
  49   progress_indication ("\n");
  50   progress_indication (_ ("Track ... "));
  51   int channel = 0;
  52   for (int i =0; i < audio_staffs_.size (); i++)
  53     {
  54       Audio_staff *s = audio_staffs_[i];
  55       if (verbose_global_b)
  56         progress_indication ("[" + to_string (i)) ;
  57
  58       /*
  59         MIDI players tend to ignore instrument settings on
  60         channel 10, the percussion channel by default.
  61        */
  62       if (channel % 16 == 9)
  63          channel++;
  64
  65
  66       /*
  67         Huh? Why does each staff also have a separate channel? We
  68         should map channels to voices, not staves. --hwn.
  69         */
  70       if (s->channel_ < 0)
  71         {
  72           s->channel_ = channel % 16;
  73           if (channel > 15)
  74             warning ("MIDI channel wrapped around. Remapping modulo 16.");
  75         }
  76
  77       s->output (midi_stream, channel++);
  78       if (verbose_global_b)
  79         progress_indication ("]");
  80     }
  81 }
  82
  83
  84 void
  85 Performance::output_header_track (Midi_stream& midi_stream)
  86 {
  87   Midi_track midi_track;
  88
  89   midi_track.channel_ = 9;
  90
  91   // perhaps multiple text events?
  92   String id_string;
  93   String str = String (_ ("Creator: "));
  94   id_string = String_convert::pad_to (gnu_lilypond_version_string (), 30);
  95   str += id_string;
  96
  97   /*
  98     This seems silly, but in fact the audio elements should
  99     be generated elsewhere: not midi-specific.
 100    */
 101   Audio_text creator_a (Audio_text::TEXT, str);
 102   Midi_text creator (&creator_a);
 103   midi_track.add (Moment (0), &creator);
 104
 105   /* Better not translate this */
 106   str = "Generated automatically by: ";
 107   str += id_string;
 108
 109   Audio_text generate_a (Audio_text::TEXT, str);
 110   Midi_text generate (&generate_a);
 111   midi_track.add (Moment (0), &generate);
 112
 113   str = _ ("at ");
 114   time_t t (time (0));
 115   str += ctime (&t);
 116   str = str.left_string (str.length () - 1);
 117   str = String_convert::pad_to (str, 60);
 118
 119   Audio_text at_a (Audio_text::TEXT, str);
 120   Midi_text at (&at_a);
 121   midi_track.add (Moment (0), &at);
 122
 123
 124   // TODO:
 125   //  str = _f ("from musical definition: %s", origin_string_);
 126
 127   Audio_text from_a (Audio_text::TEXT, str);
 128   Midi_text from (&from_a);
 129   midi_track.add (Moment (0), &from);
 130
 131   Audio_text track_name_a (Audio_text::TRACK_NAME, "Track "
 132                            + String_convert::int2dec (0, 0, '0'));
 133   Midi_text track_name (&track_name_a);
 134
 135   midi_track.add (Moment (0), &track_name);
 136
 137   // Some sequencers read track 0 last.
 138   //  Audio_tempo tempo_a (midi_->get_tempo (Moment (Rational (1, 4))));
 139   //  Midi_tempo tempo (&tempo_a);
 140   //  midi_track.add (Moment (0), &tempo);
 141
 142   midi_stream << midi_track;
 143 }
 144
 145 void
 146 Performance::add_element (Audio_element *p)
 147 {
 148   if (Audio_staff*s=dynamic_cast<Audio_staff *> (p))
 149     {
 150       audio_staffs_.push (s);
 151     }
 152   audio_elem_p_list_ = new Killing_cons<Audio_element> (p, audio_elem_p_list_);
 153 }
 154
 155 SCM
 156 Performance::process (String out)
 157 {
 158   if (out == "-")
 159     out = "lelie.midi";
 160
 161   /* Maybe a bit crude, but we had this before */
 162   File_name file_name (out);
 163   file_name.ext_ = "midi";
 164   out = file_name.to_string ();
 165
 166   Midi_stream midi_stream (out);
 167   progress_indication (_f ("MIDI output to `%s'...", out));
 168
 169   output (midi_stream);
 170   progress_indication ("\n");
 171   return SCM_UNDEFINED;
 172 }