libs/ardour/midi_source.cc

   1 /*
   2     Copyright (C) 2006 Paul Davis
   3         Written by Dave Robillard, 2006
   4
   5     This program is free software; you can redistribute it and/or modify
   6     it under the terms of the GNU General Public License as published by
   7     the Free Software Foundation; either version 2 of the License, or
   8     (at your option) any later version.
   9
  10     This program is distributed in the hope that it will be useful,
  11     but WITHOUT ANY WARRANTY; without even the implied warranty of
  12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13     GNU General Public License for more details.
  14
  15     You should have received a copy of the GNU General Public License
  16     along with this program; if not, write to the Free Software
  17     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  18 */
  19
  20 #include <sys/stat.h>
  21 #include <unistd.h>
  22 #include <fcntl.h>
  23 #include <poll.h>
  24 #include <float.h>
  25 #include <cerrno>
  26 #include <ctime>
  27 #include <cmath>
  28 #include <iomanip>
  29 #include <algorithm>
  30
  31 #include <pbd/xml++.h>
  32 #include <pbd/pthread_utils.h>
  33 #include <pbd/basename.h>
  34
  35 #include <ardour/audioengine.h>
  36 #include <ardour/midi_model.h>
  37 #include <ardour/midi_ring_buffer.h>
  38 #include <ardour/midi_source.h>
  39 #include <ardour/session.h>
  40 #include <ardour/session_directory.h>
  41 #include <ardour/source_factory.h>
  42 #include <ardour/tempo.h>
  43
  44 #include "i18n.h"
  45
  46 using namespace std;
  47 using namespace ARDOUR;
  48 using namespace PBD;
  49
  50 sigc::signal<void,MidiSource *> MidiSource::MidiSourceCreated;
  51
  52 MidiSource::MidiSource (Session& s, string name)
  53         : Source (s, name, DataType::MIDI)
  54         , _timeline_position(0)
  55         , _writing (false)
  56         , _last_read_end(0)
  57 {
  58         _read_data_count = 0;
  59         _write_data_count = 0;
  60 }
  61
  62 MidiSource::MidiSource (Session& s, const XMLNode& node)
  63         : Source (s, node)
  64         , _timeline_position(0)
  65         , _writing (false)
  66         , _last_read_end(0)
  67 {
  68         _read_data_count = 0;
  69         _write_data_count = 0;
  70
  71         if (set_state (node)) {
  72                 throw failed_constructor();
  73         }
  74 }
  75
  76 MidiSource::~MidiSource ()
  77 {
  78 }
  79
  80 XMLNode&
  81 MidiSource::get_state ()
  82 {
  83         XMLNode& node (Source::get_state());
  84
  85         if (_captured_for.length()) {
  86                 node.add_property ("captured-for", _captured_for);
  87         }
  88
  89         return node;
  90 }
  91
  92 int
  93 MidiSource::set_state (const XMLNode& node)
  94 {
  95         const XMLProperty* prop;
  96
  97         Source::set_state (node);
  98
  99         if ((prop = node.property ("captured-for")) != 0) {
 100                 _captured_for = prop->value();
 101         }
 102
 103         return 0;
 104 }
 105
 106 nframes_t
 107 MidiSource::midi_read (MidiRingBuffer<nframes_t>& dst, nframes_t start, nframes_t cnt,
 108                 nframes_t stamp_offset, nframes_t negative_stamp_offset) const
 109 {
 110
 111         Glib::Mutex::Lock lm (_lock);
 112         if (_model) {
 113                 // FIXME: assumes tempo never changes after start
 114                 const Tempo& tempo = _session.tempo_map().tempo_at(_timeline_position);
 115                 const double frames_per_beat = tempo.frames_per_beat(
 116                                 _session.engine().frame_rate(),
 117                                 _session.tempo_map().meter_at(_timeline_position));
 118 #define BEATS_TO_FRAMES(t) (((t) * frames_per_beat) + stamp_offset - negative_stamp_offset)
 119
 120                 Evoral::Sequence<double>::const_iterator& i = _model_iter;
 121
 122                 if (_last_read_end == 0 || start != _last_read_end) {
 123                         cerr << "MidiSource::midi_read seeking to frame " << start << endl;
 124                         for (i = _model->begin(); i != _model->end(); ++i) {
 125                                 if (BEATS_TO_FRAMES(i->time()) >= start) {
 126                                         break;
 127                                 }
 128                         }
 129                 }
 130
 131                 _last_read_end = start + cnt;
 132
 133                 for (; i != _model->end(); ++i) {
 134                         const nframes_t time_frames = BEATS_TO_FRAMES(i->time());
 135                         if (time_frames < start + cnt) {
 136                                 dst.write(time_frames, i->event_type(), i->size(), i->buffer());
 137                         } else {
 138                                 break;
 139                         }
 140                 }
 141                 return cnt;
 142         } else {
 143                 return read_unlocked (dst, start, cnt, stamp_offset, negative_stamp_offset);
 144         }
 145 }
 146
 147 nframes_t
 148 MidiSource::midi_write (MidiRingBuffer<nframes_t>& dst, nframes_t cnt)
 149 {
 150         Glib::Mutex::Lock lm (_lock);
 151         return write_unlocked (dst, cnt);
 152 }
 153
 154 bool
 155 MidiSource::file_changed (string path)
 156 {
 157         struct stat stat_file;
 158
 159         int e1 = stat (path.c_str(), &stat_file);
 160
 161         return !e1;
 162 }
 163
 164 void
 165 MidiSource::mark_streaming_midi_write_started (NoteMode mode, nframes_t start_frame)
 166 {
 167         set_timeline_position(start_frame); // why do I have a feeling this can break somehow...
 168
 169         if (_model) {
 170                 _model->set_note_mode(mode);
 171                 _model->start_write();
 172         }
 173
 174         _writing = true;
 175 }
 176
 177 void
 178 MidiSource::mark_streaming_write_started ()
 179 {
 180         if (_model) {
 181                 _model->start_write();
 182         }
 183
 184         _writing = true;
 185 }
 186
 187 void
 188 MidiSource::mark_streaming_write_completed ()
 189 {
 190         if (_model) {
 191                 _model->end_write(false); // FIXME: param?
 192         }
 193
 194         _writing = false;
 195 }
 196
 197 void
 198 MidiSource::session_saved()
 199 {
 200         flush_midi();
 201
 202         if (_model && _model->edited()) {
 203                 string newname;
 204                 const string basename = PBD::basename_nosuffix(_name);
 205                 string::size_type last_dash = basename.find_last_of("-");
 206                 if (last_dash == string::npos || last_dash == basename.find_first_of("-")) {
 207                         newname = basename + "-1";
 208                 } else {
 209                         stringstream ss(basename.substr(last_dash+1));
 210                         unsigned write_count = 0;
 211                         ss >> write_count;
 212                         cerr << "WRITE COUNT: " << write_count << endl;
 213                         ++write_count; // start at 1
 214                         ss.clear();
 215                         ss << basename.substr(0, last_dash) << "-" << write_count;
 216                         newname = ss.str();
 217                 }
 218
 219                 string newpath = _session.session_directory().midi_path().to_string() +"/"+ newname + ".mid";
 220
 221                 boost::shared_ptr<MidiSource> newsrc = boost::dynamic_pointer_cast<MidiSource>(
 222                                 SourceFactory::createWritable(DataType::MIDI, _session, newpath, 1, 0, true));
 223
 224                 newsrc->set_timeline_position(_timeline_position);
 225                 _model->write_to(newsrc);
 226
 227                 // cyclic dependency here, ugly :(
 228                 newsrc->set_model(_model);
 229                 _model->set_midi_source(newsrc.get());
 230
 231                 newsrc->flush_midi();
 232
 233                 Switched.emit(newsrc);
 234         }
 235 }
 236
 237 void
 238 MidiSource::set_note_mode(NoteMode mode)
 239 {
 240         if (_model) {
 241                 _model->set_note_mode(mode);
 242         }
 243 }
 244