lily/performance.cc

   1 /*
   2   performance.cc -- implement Performance
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 1997--2009 Jan Nieuwenhuizen <janneke@gnu.org>
   7 */
   8
   9 #include "performance.hh"
  10
  11 #include <ctime>
  12 using namespace std;
  13
  14 #include "audio-column.hh"
  15 #include "audio-staff.hh"
  16 #include "file-name.hh"
  17 #include "international.hh"
  18 #include "lily-version.hh"
  19 #include "main.hh"
  20 #include "midi-chunk.hh"
  21 #include "midi-stream.hh"
  22 #include "score.hh"
  23 #include "string-convert.hh"
  24 #include "warn.hh"
  25
  26 Performance::Performance ()
  27 {
  28   midi_ = 0;
  29 }
  30
  31 Performance::~Performance ()
  32 {
  33   junk_pointers (audio_elements_);
  34 }
  35
  36 void
  37 Performance::output (Midi_stream &midi_stream) const
  38 {
  39   int tracks_ = audio_staffs_.size ();
  40
  41   midi_stream.write (Midi_header (1, tracks_, 384));
  42   if (be_verbose_global)
  43     progress_indication (_ ("Track...") + " ");
  44
  45   int channel = 0;
  46   for (vsize i = 0; i < audio_staffs_.size (); i++)
  47     {
  48       Audio_staff *s = audio_staffs_[i];
  49       if (be_verbose_global)
  50         progress_indication ("[" + to_string (i));
  51
  52       int midi_channel =  s->channel_;
  53
  54       if (midi_channel < 0)
  55         {
  56           midi_channel = channel;
  57           channel ++;
  58           /*
  59             MIDI players tend to ignore instrument settings on
  60             channel 10, the percussion channel.
  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 (midi_channel > 15)
  71         {
  72           warning (_ ("MIDI channel wrapped around"));
  73           warning (_ ("remapping modulo 16"));
  74
  75           midi_channel = midi_channel % 16;
  76         }
  77
  78       s->output (midi_stream, midi_channel);
  79       if (be_verbose_global)
  80         progress_indication ("]");
  81     }
  82 }
  83 void
  84 Performance::add_element (Audio_element *p)
  85 {
  86   audio_elements_.push_back (p);
  87 }
  88
  89 void
  90 Performance::write_output (string out) const
  91 {
  92   if (out == "-")
  93     out = "lelie.midi";
  94
  95   /* Maybe a bit crude, but we had this before */
  96   File_name file_name (out);
  97   out = file_name.to_string ();
  98
  99   Midi_stream midi_stream (out);
 100   message (_f ("MIDI output to `%s'...", out));
 101
 102   output (midi_stream);
 103   progress_indication ("\n");
 104 }
 105
 106
 107 void
 108 Performance::process ()
 109 {
 110 }
 111
 112 Performance *
 113 unsmob_performance (SCM x)
 114 {
 115   return dynamic_cast<Performance*> (unsmob_music_output (x));
 116 }