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_ring_buffer.h>
  37 #include <ardour/midi_source.h>
  38 #include <ardour/session.h>
  39 #include <ardour/session_directory.h>
  40 #include <ardour/source_factory.h>
  41 #include <ardour/tempo.h>
  42
  43 #include "i18n.h"
  44
  45 using namespace std;
  46 using namespace ARDOUR;
  47 using namespace PBD;
  48
  49 sigc::signal<void,MidiSource *> MidiSource::MidiSourceCreated;
  50
  51 MidiSource::MidiSource (Session& s, string name)
  52         : Source (s, name, DataType::MIDI)
  53         , _timeline_position(0)
  54         , _model(new MidiModel(this))
  55         , _writing (false)
  56         , _model_iter(*_model.get(), 0.0)
  57         , _last_read_end(0)
  58 {
  59         _read_data_count = 0;
  60         _write_data_count = 0;
  61 }
  62
  63 MidiSource::MidiSource (Session& s, const XMLNode& node)
  64         : Source (s, node)
  65         , _timeline_position(0)
  66         , _model(new MidiModel(this))
  67         , _writing (false)
  68         , _model_iter(*_model.get(), 0.0)
  69         , _last_read_end(0)
  70 {
  71         _read_data_count = 0;
  72         _write_data_count = 0;
  73
  74         if (set_state (node)) {
  75                 throw failed_constructor();
  76         }
  77 }
  78
  79 MidiSource::~MidiSource ()
  80 {
  81 }
  82
  83 XMLNode&
  84 MidiSource::get_state ()
  85 {
  86         XMLNode& node (Source::get_state());
  87
  88         if (_captured_for.length()) {
  89                 node.add_property ("captured-for", _captured_for);
  90         }
  91
  92         return node;
  93 }
  94
  95 int
  96 MidiSource::set_state (const XMLNode& node)
  97 {
  98         const XMLProperty* prop;
  99
 100         Source::set_state (node);
 101
 102         if ((prop = node.property ("captured-for")) != 0) {
 103                 _captured_for = prop->value();
 104         }
 105
 106         return 0;
 107 }
 108
 109 nframes_t
 110 MidiSource::midi_read (MidiRingBuffer<nframes_t>& dst, nframes_t start, nframes_t cnt,
 111                 nframes_t stamp_offset, nframes_t negative_stamp_offset) const
 112 {
 113
 114         Glib::Mutex::Lock lm (_lock);
 115         if (_model) {
 116                 // FIXME: assumes tempo never changes after start
 117                 const Tempo& tempo = _session.tempo_map().tempo_at(_timeline_position);
 118                 const double frames_per_beat = tempo.frames_per_beat(
 119                                 _session.engine().frame_rate(),
 120                                 _session.tempo_map().meter_at(_timeline_position));
 121 #define BEATS_TO_FRAMES(t) (((t) * frames_per_beat) + stamp_offset - negative_stamp_offset)
 122
 123                 Evoral::Sequence<double>::const_iterator& i = _model_iter;
 124
 125                 if (_last_read_end == 0 || start != _last_read_end) {
 126                         cerr << "MidiSource::midi_read seeking to frame " << start << endl;
 127                         for (i = _model->begin(); i != _model->end(); ++i) {
 128                                 if (BEATS_TO_FRAMES(i->time()) >= start) {
 129                                         break;
 130                                 }
 131                         }
 132                 }
 133
 134                 _last_read_end = start + cnt;
 135
 136                 for (; i != _model->end(); ++i) {
 137                         const nframes_t time_frames = BEATS_TO_FRAMES(i->time());
 138                         if (time_frames < start + cnt) {
 139                                 dst.write(time_frames, i->event_type(), i->size(), i->buffer());
 140                         } else {
 141                                 break;
 142                         }
 143                 }
 144                 return cnt;
 145         } else {
 146                 return read_unlocked (dst, start, cnt, stamp_offset, negative_stamp_offset);
 147         }
 148 }
 149
 150 nframes_t
 151 MidiSource::midi_write (MidiRingBuffer<nframes_t>& dst, nframes_t cnt)
 152 {
 153         Glib::Mutex::Lock lm (_lock);
 154         return write_unlocked (dst, cnt);
 155 }
 156
 157 bool
 158 MidiSource::file_changed (string path)
 159 {
 160         struct stat stat_file;
 161
 162         int e1 = stat (path.c_str(), &stat_file);
 163
 164         return !e1;
 165 }
 166
 167 void
 168 MidiSource::mark_streaming_midi_write_started (NoteMode mode, nframes_t start_frame)
 169 {
 170         set_timeline_position(start_frame); // why do I have a feeling this can break somehow...
 171
 172         if (_model) {
 173                 _model->set_note_mode(mode);
 174                 _model->start_write();
 175         }
 176
 177         _writing = true;
 178 }
 179
 180 void
 181 MidiSource::mark_streaming_write_started ()
 182 {
 183         if (_model) {
 184                 _model->start_write();
 185         }
 186
 187         _writing = true;
 188 }
 189
 190 void
 191 MidiSource::mark_streaming_write_completed ()
 192 {
 193         if (_model) {
 194                 _model->end_write(false); // FIXME: param?
 195         }
 196
 197         _writing = false;
 198 }
 199
 200 void
 201 MidiSource::session_saved()
 202 {
 203         flush_midi();
 204
 205         if (_model && _model->edited()) {
 206                 string newname;
 207                 const string basename = PBD::basename_nosuffix(_name);
 208                 string::size_type last_dash = basename.find_last_of("-");
 209                 if (last_dash == string::npos || last_dash == basename.find_first_of("-")) {
 210                         newname = basename + "-1";
 211                 } else {
 212                         stringstream ss(basename.substr(last_dash+1));
 213                         unsigned write_count = 0;
 214                         ss >> write_count;
 215                         cerr << "WRITE COUNT: " << write_count << endl;
 216                         ++write_count; // start at 1
 217                         ss.clear();
 218                         ss << basename.substr(0, last_dash) << "-" << write_count;
 219                         newname = ss.str();
 220                 }
 221
 222                 string newpath = _session.session_directory().midi_path().to_string() +"/"+ newname + ".mid";
 223
 224                 boost::shared_ptr<MidiSource> newsrc = boost::dynamic_pointer_cast<MidiSource>(
 225                                 SourceFactory::createWritable(DataType::MIDI, _session, newpath, 1, 0, true));
 226
 227                 newsrc->set_timeline_position(_timeline_position);
 228                 _model->write_to(newsrc);
 229
 230                 // cyclic dependency here, ugly :(
 231                 newsrc->set_model(_model);
 232                 _model->set_midi_source(newsrc.get());
 233
 234                 newsrc->flush_midi();
 235
 236                 Switched.emit(newsrc);
 237         }
 238 }
 239