lily/performance.cc

   1 /*
   2   This file is part of LilyPond, the GNU music typesetter.
   3
   4   Copyright (C) 1997--2010 Jan Nieuwenhuizen <janneke@gnu.org>
   5
   6   LilyPond is free software: you can redistribute it and/or modify
   7   it under the terms of the GNU General Public License as published by
   8   the Free Software Foundation, either version 3 of the License, or
   9   (at your option) any later version.
  10
  11   LilyPond is distributed in the hope that it will be useful,
  12   but WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14   GNU General Public License for more details.
  15
  16   You should have received a copy of the GNU General Public License
  17   along with LilyPond.  If not, see <http://www.gnu.org/licenses/>.
  18 */
  19
  20 #include "performance.hh"
  21
  22 #include <ctime>
  23 using namespace std;
  24
  25 #include "audio-column.hh"
  26 #include "audio-staff.hh"
  27 #include "file-name.hh"
  28 #include "international.hh"
  29 #include "lily-version.hh"
  30 #include "main.hh"
  31 #include "midi-chunk.hh"
  32 #include "midi-stream.hh"
  33 #include "score.hh"
  34 #include "string-convert.hh"
  35 #include "warn.hh"
  36
  37 Performance::Performance ()
  38 {
  39   midi_ = 0;
  40 }
  41
  42 Performance::~Performance ()
  43 {
  44   junk_pointers (audio_elements_);
  45 }
  46
  47 void
  48 Performance::output (Midi_stream &midi_stream) const
  49 {
  50   int tracks_ = audio_staffs_.size ();
  51
  52   midi_stream.write (Midi_header (1, tracks_, 384));
  53   if (be_verbose_global)
  54     progress_indication (_ ("Track...") + " ");
  55
  56   int channel = 0;
  57   for (vsize i = 0; i < audio_staffs_.size (); i++)
  58     {
  59       Audio_staff *s = audio_staffs_[i];
  60       if (be_verbose_global)
  61         progress_indication ("[" + to_string (i));
  62
  63       int midi_channel =  s->channel_;
  64
  65       if (midi_channel < 0)
  66         {
  67           midi_channel = channel;
  68           channel ++;
  69           /*
  70             MIDI players tend to ignore instrument settings on
  71             channel 10, the percussion channel.
  72           */
  73           if (channel % 16 == 9)
  74             channel ++;
  75         }
  76
  77       /*
  78         Huh? Why does each staff also have a separate channel? We
  79         should map channels to voices, not staves. --hwn.
  80       */
  81       if (midi_channel > 15)
  82         {
  83           warning (_ ("MIDI channel wrapped around"));
  84           warning (_ ("remapping modulo 16"));
  85
  86           midi_channel = midi_channel % 16;
  87         }
  88
  89       s->output (midi_stream, midi_channel);
  90       if (be_verbose_global)
  91         progress_indication ("]");
  92     }
  93 }
  94 void
  95 Performance::add_element (Audio_element *p)
  96 {
  97   audio_elements_.push_back (p);
  98 }
  99
 100 void
 101 Performance::write_output (string out) const
 102 {
 103   if (out == "-")
 104     out = "lelie.midi";
 105
 106   /* Maybe a bit crude, but we had this before */
 107   File_name file_name (out);
 108   out = file_name.to_string ();
 109
 110   Midi_stream midi_stream (out);
 111   message (_f ("MIDI output to `%s'...", out));
 112
 113   output (midi_stream);
 114   progress_indication ("\n");
 115 }
 116
 117
 118 void
 119 Performance::process ()
 120 {
 121 }
 122
 123 Performance *
 124 unsmob_performance (SCM x)
 125 {
 126   return dynamic_cast<Performance*> (unsmob_music_output (x));
 127 }