lily/midi-chunk.cc

   1 /*
   2   This file is part of LilyPond, the GNU music typesetter.
   3
   4   Copyright (C) 2007--2010 Han-Wen Nienhuys <hanwen@lilypond.org>
   5
   6
   7   LilyPond is free software: you can redistribute it and/or modify
   8   it under the terms of the GNU General Public License as published by
   9   the Free Software Foundation, either version 3 of the License, or
  10   (at your option) any later version.
  11
  12   LilyPond is distributed in the hope that it will be useful,
  13   but WITHOUT ANY WARRANTY; without even the implied warranty of
  14   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15   GNU General Public License for more details.
  16
  17   You should have received a copy of the GNU General Public License
  18   along with LilyPond.  If not, see <http://www.gnu.org/licenses/>.
  19 */
  20
  21 #include "midi-chunk.hh"
  22
  23 #include "midi-item.hh"
  24 #include "std-string.hh"
  25 #include "string-convert.hh"
  26
  27 Midi_track::Midi_track ()
  28 {
  29   //                4D 54 72 6B     MTrk
  30   //                00 00 00 3B     chunk length (59)
  31   //        00      FF 58 04 04 02 18 08    time signature
  32   //        00      FF 51 03 07 A1 20       tempo
  33
  34   // FF 59 02 sf mi  Key Signature
  35   //         sf = -7:  7 flats
  36   //         sf = -1:  1 flat
  37   //         sf = 0:  key of C
  38   //         sf = 1:  1 sharp
  39   //         sf = 7: 7 sharps
  40   //         mi = 0:  major key
  41   //         mi = 1:  minor key
  42
  43   number_ = 0;
  44
  45   char const *data_str0 = ""
  46     //        "00" "ff58" "0404" "0218" "08"
  47     //  "00" "ff51" "0307" "a120"
  48     // why a key at all, in midi?
  49     // key: C
  50     //  "00" "ff59" "02" "00" "00"
  51     // key: F (scsii-menuetto)
  52     //                            "00" "ff59" "02" "ff" "00"
  53     ;
  54
  55   string data_string;
  56   // only for format 0 (currently using format 1)?
  57   data_string += String_convert::hex2bin (data_str0);
  58
  59   char const *footer_str0 = "00" "ff2f" "00";
  60   string footer_string = String_convert::hex2bin (footer_str0);
  61
  62   set ("MTrk", data_string, footer_string);
  63 }
  64
  65 void
  66 Midi_track::add (int delta_ticks, Midi_item *midi)
  67 {
  68   assert (delta_ticks >= 0);
  69
  70   Midi_event *e = new Midi_event (delta_ticks, midi);
  71   events_.push_back (e);
  72 }
  73
  74 string
  75 Midi_track::data_string () const
  76 {
  77   string str = Midi_chunk::data_string ();
  78
  79   for (vector<Midi_event*>::const_iterator i (events_.begin ());
  80        i != events_.end (); i ++)
  81     {
  82       str += (*i)->to_string ();
  83     }
  84   return str;
  85 }
  86
  87
  88 Midi_track::~Midi_track ()
  89 {
  90   junk_pointers (events_);
  91 }
  92
  93 /****************************************************************
  94   event
  95 */
  96 Midi_event::Midi_event (int delta_ticks, Midi_item *midi)
  97 {
  98   delta_ticks_ = delta_ticks;
  99   midi_ = midi;
 100 }
 101
 102 string
 103 Midi_event::to_string () const
 104 {
 105   string delta_string = int2midi_varint_string (delta_ticks_);
 106   string midi_string = midi_->to_string ();
 107   assert (midi_string.length ());
 108   return delta_string + midi_string;
 109 }
 110 /****************************************************************
 111  header
 112 */
 113
 114 Midi_header::Midi_header (int format, int tracks, int clocks_per_4)
 115 {
 116   string str;
 117
 118   string format_string = String_convert::int2hex (format, 4, '0');
 119   str += String_convert::hex2bin (format_string);
 120
 121   string tracks_string = String_convert::int2hex (tracks, 4, '0');
 122   str += String_convert::hex2bin (tracks_string);
 123
 124   string tempo_string = String_convert::int2hex (clocks_per_4, 4, '0');
 125   str += String_convert::hex2bin (tempo_string);
 126
 127   set ("MThd", str, "");
 128 }
 129
 130
 131 /****************************************************************
 132    chunk
 133  */
 134 Midi_chunk::~Midi_chunk ()
 135 {
 136
 137 }
 138
 139 void
 140 Midi_chunk::set (string header_string, string data_string, string footer_string)
 141 {
 142   data_string_ = data_string;
 143   footer_string_ = footer_string;
 144   header_string_ = header_string;
 145 }
 146
 147 string
 148 Midi_chunk::data_string () const
 149 {
 150   return data_string_;
 151 }
 152
 153 string
 154 Midi_chunk::to_string () const
 155 {
 156   string str = header_string_;
 157   string dat = data_string ();
 158   string length_string = String_convert::int2hex (dat.length ()
 159                                                   + footer_string_.length (), 8, '0');
 160   length_string = String_convert::hex2bin (length_string);
 161
 162   str += length_string;
 163   str += dat;
 164   str += footer_string_;
 165
 166   return str;
 167 }
 168