src/lib/writer.cc

   1 /*
   2     Copyright (C) 2012 Carl Hetherington <cth@carlh.net>
   3
   4     This program is free software; you can redistribute it and/or modify
   5     it under the terms of the GNU General Public License as published by
   6     the Free Software Foundation; either version 2 of the License, or
   7     (at your option) any later version.
   8
   9     This program is distributed in the hope that it will be useful,
  10     but WITHOUT ANY WARRANTY; without even the implied warranty of
  11     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12     GNU General Public License for more details.
  13
  14     You should have received a copy of the GNU General Public License
  15     along with this program; if not, write to the Free Software
  16     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  17
  18 */
  19
  20 #include <fstream>
  21 #include <libdcp/picture_asset.h>
  22 #include <libdcp/sound_asset.h>
  23 #include <libdcp/picture_frame.h>
  24 #include <libdcp/reel.h>
  25 #include "writer.h"
  26 #include "compose.hpp"
  27 #include "film.h"
  28 #include "format.h"
  29 #include "log.h"
  30 #include "dcp_video_frame.h"
  31 #include "playlist.h"
  32
  33 #include "i18n.h"
  34
  35 using std::make_pair;
  36 using std::pair;
  37 using std::string;
  38 using std::ifstream;
  39 using std::list;
  40 using std::cout;
  41 using boost::shared_ptr;
  42
  43 int const Writer::_maximum_frames_in_memory = 8;
  44
  45 Writer::Writer (shared_ptr<Film> f, shared_ptr<Playlist> p)
  46         : _film (f)
  47         , _playlist (p)
  48         , _first_nonexistant_frame (0)
  49         , _thread (0)
  50         , _finish (false)
  51         , _queued_full_in_memory (0)
  52         , _last_written_frame (-1)
  53         , _full_written (0)
  54         , _fake_written (0)
  55         , _repeat_written (0)
  56         , _pushed_to_disk (0)
  57 {
  58         /* Remove any old DCP */
  59         boost::filesystem::remove_all (_film->dir (_film->dcp_name ()));
  60
  61         check_existing_picture_mxf ();
  62
  63         /* Create our picture asset in a subdirectory, named according to those
  64            film's parameters which affect the video output.  We will hard-link
  65            it into the DCP later.
  66         */
  67
  68         _picture_asset.reset (
  69                 new libdcp::MonoPictureAsset (
  70                         _film->video_mxf_dir (),
  71                         _film->video_mxf_filename (),
  72                         _film->dcp_frame_rate (),
  73                         _film->format()->dcp_size ()
  74                         )
  75                 );
  76
  77         _picture_asset_writer = _picture_asset->start_write (_first_nonexistant_frame > 0);
  78
  79         AudioMapping m (_playlist->audio_channels ());
  80
  81         if (m.dcp_channels() > 0) {
  82                 _sound_asset.reset (
  83                         new libdcp::SoundAsset (
  84                                 _film->dir (_film->dcp_name()),
  85                                 N_("audio.mxf"),
  86                                 _film->dcp_frame_rate (),
  87                                 m.dcp_channels (),
  88                                 dcp_audio_sample_rate (_playlist->audio_frame_rate())
  89                                 )
  90                         );
  91
  92                 _sound_asset_writer = _sound_asset->start_write ();
  93         }
  94
  95         _thread = new boost::thread (boost::bind (&Writer::thread, this));
  96 }
  97
  98 void
  99 Writer::write (shared_ptr<const EncodedData> encoded, int frame)
 100 {
 101         boost::mutex::scoped_lock lock (_mutex);
 102
 103         QueueItem qi;
 104         qi.type = QueueItem::FULL;
 105         qi.encoded = encoded;
 106         qi.frame = frame;
 107         _queue.push_back (qi);
 108         ++_queued_full_in_memory;
 109
 110         _condition.notify_all ();
 111 }
 112
 113 void
 114 Writer::fake_write (int frame)
 115 {
 116         boost::mutex::scoped_lock lock (_mutex);
 117
 118         ifstream ifi (_film->info_path (frame).c_str());
 119         libdcp::FrameInfo info (ifi);
 120
 121         QueueItem qi;
 122         qi.type = QueueItem::FAKE;
 123         qi.size = info.size;
 124         qi.frame = frame;
 125         _queue.push_back (qi);
 126
 127         _condition.notify_all ();
 128 }
 129
 130 /** This method is not thread safe */
 131 void
 132 Writer::write (shared_ptr<const AudioBuffers> audio)
 133 {
 134         _sound_asset_writer->write (audio->data(), audio->frames());
 135 }
 136
 137 void
 138 Writer::thread ()
 139 try
 140 {
 141         while (1)
 142         {
 143                 boost::mutex::scoped_lock lock (_mutex);
 144
 145                 while (1) {
 146
 147                         _queue.sort ();
 148
 149                         if (_finish ||
 150                             _queued_full_in_memory > _maximum_frames_in_memory ||
 151                             (!_queue.empty() && _queue.front().frame == (_last_written_frame + 1))) {
 152
 153                                 break;
 154                         }
 155
 156                         TIMING (N_("writer sleeps with a queue of %1"), _queue.size());
 157                         _condition.wait (lock);
 158                         TIMING (N_("writer wakes with a queue of %1"), _queue.size());
 159                 }
 160
 161                 if (_finish && _queue.empty()) {
 162                         return;
 163                 }
 164
 165                 /* Write any frames that we can write; i.e. those that are in sequence */
 166                 while (!_queue.empty() && _queue.front().frame == (_last_written_frame + 1)) {
 167                         QueueItem qi = _queue.front ();
 168                         _queue.pop_front ();
 169                         if (qi.type == QueueItem::FULL && qi.encoded) {
 170                                 --_queued_full_in_memory;
 171                         }
 172
 173                         lock.unlock ();
 174                         switch (qi.type) {
 175                         case QueueItem::FULL:
 176                         {
 177                                 _film->log()->log (String::compose (N_("Writer FULL-writes %1 to MXF"), qi.frame));
 178                                 if (!qi.encoded) {
 179                                         qi.encoded.reset (new EncodedData (_film->j2c_path (qi.frame, false)));
 180                                 }
 181                                 libdcp::FrameInfo const fin = _picture_asset_writer->write (qi.encoded->data(), qi.encoded->size());
 182                                 qi.encoded->write_info (_film, qi.frame, fin);
 183                                 _last_written = qi.encoded;
 184                                 ++_full_written;
 185                                 break;
 186                         }
 187                         case QueueItem::FAKE:
 188                                 _film->log()->log (String::compose (N_("Writer FAKE-writes %1 to MXF"), qi.frame));
 189                                 _picture_asset_writer->fake_write (qi.size);
 190                                 _last_written.reset ();
 191                                 ++_fake_written;
 192                                 break;
 193                         case QueueItem::REPEAT:
 194                         {
 195                                 _film->log()->log (String::compose (N_("Writer REPEAT-writes %1 to MXF"), qi.frame));
 196                                 libdcp::FrameInfo const fin = _picture_asset_writer->write (_last_written->data(), _last_written->size());
 197                                 _last_written->write_info (_film, qi.frame, fin);
 198                                 ++_repeat_written;
 199                                 break;
 200                         }
 201                         }
 202                         lock.lock ();
 203
 204                         ++_last_written_frame;
 205                 }
 206
 207                 while (_queued_full_in_memory > _maximum_frames_in_memory) {
 208                         /* Too many frames in memory which can't yet be written to the stream.
 209                            Write some FULL frames to disk.
 210                         */
 211
 212                         /* Find one */
 213                         list<QueueItem>::reverse_iterator i = _queue.rbegin ();
 214                         while (i != _queue.rend() && (i->type != QueueItem::FULL || !i->encoded)) {
 215                                 ++i;
 216                         }
 217
 218                         assert (i != _queue.rend());
 219                         QueueItem qi = *i;
 220
 221                         ++_pushed_to_disk;
 222
 223                         lock.unlock ();
 224                         _film->log()->log (String::compose (N_("Writer full (awaiting %1); pushes %2 to disk"), _last_written_frame + 1, qi.frame));
 225                         qi.encoded->write (_film, qi.frame);
 226                         lock.lock ();
 227                         qi.encoded.reset ();
 228                         --_queued_full_in_memory;
 229                 }
 230         }
 231 }
 232 catch (...)
 233 {
 234         store_current ();
 235 }
 236
 237 void
 238 Writer::finish ()
 239 {
 240         if (!_thread) {
 241                 return;
 242         }
 243
 244         boost::mutex::scoped_lock lock (_mutex);
 245         _finish = true;
 246         _condition.notify_all ();
 247         lock.unlock ();
 248
 249         _thread->join ();
 250         if (thrown ()) {
 251                 rethrow ();
 252         }
 253
 254         delete _thread;
 255         _thread = 0;
 256
 257         _picture_asset_writer->finalize ();
 258
 259         if (_sound_asset_writer) {
 260                 _sound_asset_writer->finalize ();
 261         }
 262
 263         int const frames = _last_written_frame + 1;
 264         int const duration = frames - _film->trim_start() - _film->trim_end();
 265
 266         _picture_asset->set_entry_point (_film->trim_start ());
 267         _picture_asset->set_duration (duration);
 268
 269         /* Hard-link the video MXF into the DCP */
 270
 271         boost::filesystem::path from;
 272         from /= _film->video_mxf_dir();
 273         from /= _film->video_mxf_filename();
 274
 275         boost::filesystem::path to;
 276         to /= _film->dir (_film->dcp_name());
 277         to /= N_("video.mxf");
 278
 279         boost::system::error_code ec;
 280         boost::filesystem::create_hard_link (from, to, ec);
 281         if (ec) {
 282                 /* hard link failed; copy instead */
 283                 boost::filesystem::copy_file (from, to);
 284                 _film->log()->log ("Hard-link failed; fell back to copying");
 285         }
 286
 287         /* And update the asset */
 288
 289         _picture_asset->set_directory (_film->dir (_film->dcp_name ()));
 290         _picture_asset->set_file_name (N_("video.mxf"));
 291
 292         if (_sound_asset) {
 293                 _sound_asset->set_entry_point (_film->trim_start ());
 294                 _sound_asset->set_duration (duration);
 295         }
 296
 297         libdcp::DCP dcp (_film->dir (_film->dcp_name()));
 298
 299         shared_ptr<libdcp::CPL> cpl (
 300                 new libdcp::CPL (
 301                         _film->dir (_film->dcp_name()),
 302                         _film->dcp_name(),
 303                         _film->dcp_content_type()->libdcp_kind (),
 304                         frames,
 305                         _film->dcp_frame_rate ()
 306                         )
 307                 );
 308
 309         dcp.add_cpl (cpl);
 310
 311         cpl->add_reel (shared_ptr<libdcp::Reel> (new libdcp::Reel (
 312                                                          _picture_asset,
 313                                                          _sound_asset,
 314                                                          shared_ptr<libdcp::SubtitleAsset> ()
 315                                                          )
 316                                ));
 317
 318         dcp.write_xml ();
 319
 320         _film->log()->log (String::compose (N_("Wrote %1 FULL, %2 FAKE, %3 REPEAT; %4 pushed to disk"), _full_written, _fake_written, _repeat_written, _pushed_to_disk));
 321 }
 322
 323 /** Tell the writer that frame `f' should be a repeat of the frame before it */
 324 void
 325 Writer::repeat (int f)
 326 {
 327         boost::mutex::scoped_lock lock (_mutex);
 328
 329         QueueItem qi;
 330         qi.type = QueueItem::REPEAT;
 331         qi.frame = f;
 332
 333         _queue.push_back (qi);
 334
 335         _condition.notify_all ();
 336 }
 337
 338
 339 void
 340 Writer::check_existing_picture_mxf ()
 341 {
 342         /* Try to open the existing MXF */
 343         boost::filesystem::path p;
 344         p /= _film->video_mxf_dir ();
 345         p /= _film->video_mxf_filename ();
 346         FILE* mxf = fopen (p.string().c_str(), N_("rb"));
 347         if (!mxf) {
 348                 return;
 349         }
 350
 351         while (1) {
 352
 353                 /* Read the frame info as written */
 354                 ifstream ifi (_film->info_path (_first_nonexistant_frame).c_str());
 355                 libdcp::FrameInfo info (ifi);
 356
 357                 /* Read the data from the MXF and hash it */
 358                 fseek (mxf, info.offset, SEEK_SET);
 359                 EncodedData data (info.size);
 360                 fread (data.data(), 1, data.size(), mxf);
 361                 string const existing_hash = md5_digest (data.data(), data.size());
 362
 363                 if (existing_hash != info.hash) {
 364                         _film->log()->log (String::compose (N_("Existing frame %1 failed hash check"), _first_nonexistant_frame));
 365                         break;
 366                 }
 367
 368                 _film->log()->log (String::compose (N_("Have existing frame %1"), _first_nonexistant_frame));
 369                 ++_first_nonexistant_frame;
 370         }
 371
 372         fclose (mxf);
 373 }
 374
 375 /** @param frame Frame index.
 376  *  @return true if we can fake-write this frame.
 377  */
 378 bool
 379 Writer::can_fake_write (int frame) const
 380 {
 381         /* We have to do a proper write of the first frame so that we can set up the JPEG2000
 382            parameters in the MXF writer.
 383         */
 384         return (frame != 0 && frame < _first_nonexistant_frame);
 385 }
 386
 387 bool
 388 operator< (QueueItem const & a, QueueItem const & b)
 389 {
 390         return a.frame < b.frame;
 391 }
 392
 393 bool
 394 operator== (QueueItem const & a, QueueItem const & b)
 395 {
 396         return a.frame == b.frame;
 397 }