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 <cerrno>
  22 #include <libdcp/picture_asset.h>
  23 #include <libdcp/sound_asset.h>
  24 #include <libdcp/picture_frame.h>
  25 #include <libdcp/reel.h>
  26 #include <libdcp/dcp.h>
  27 #include <libdcp/cpl.h>
  28 #include "writer.h"
  29 #include "compose.hpp"
  30 #include "film.h"
  31 #include "ratio.h"
  32 #include "log.h"
  33 #include "dcp_video_frame.h"
  34 #include "dcp_content_type.h"
  35 #include "player.h"
  36 #include "audio_mapping.h"
  37 #include "config.h"
  38 #include "job.h"
  39
  40 #include "i18n.h"
  41
  42 using std::make_pair;
  43 using std::pair;
  44 using std::string;
  45 using std::ifstream;
  46 using std::list;
  47 using std::cout;
  48 using boost::shared_ptr;
  49
  50 int const Writer::_maximum_frames_in_memory = 8;
  51
  52 Writer::Writer (shared_ptr<const Film> f, shared_ptr<Job> j)
  53         : _film (f)
  54         , _job (j)
  55         , _first_nonexistant_frame (0)
  56         , _thread (0)
  57         , _finish (false)
  58         , _queued_full_in_memory (0)
  59         , _last_written_frame (-1)
  60         , _full_written (0)
  61         , _fake_written (0)
  62         , _repeat_written (0)
  63         , _pushed_to_disk (0)
  64 {
  65         /* Remove any old DCP */
  66         boost::filesystem::remove_all (_film->dir (_film->dcp_name ()));
  67
  68         check_existing_picture_mxf ();
  69
  70         /* Create our picture asset in a subdirectory, named according to those
  71            film's parameters which affect the video output.  We will hard-link
  72            it into the DCP later.
  73         */
  74
  75         _picture_asset.reset (
  76                 new libdcp::MonoPictureAsset (
  77                         _film->internal_video_mxf_dir (),
  78                         _film->internal_video_mxf_filename (),
  79                         _film->dcp_video_frame_rate (),
  80                         _film->container()->size (_film->full_frame ())
  81                         )
  82                 );
  83
  84         _picture_asset_writer = _picture_asset->start_write (_first_nonexistant_frame > 0);
  85
  86         _sound_asset.reset (
  87                 new libdcp::SoundAsset (
  88                         _film->dir (_film->dcp_name()),
  89                         _film->dcp_audio_mxf_filename (),
  90                         _film->dcp_video_frame_rate (),
  91                         _film->dcp_audio_channels (),
  92                         _film->dcp_audio_frame_rate()
  93                         )
  94                 );
  95
  96         _sound_asset_writer = _sound_asset->start_write ();
  97
  98         _thread = new boost::thread (boost::bind (&Writer::thread, this));
  99 }
 100
 101 void
 102 Writer::write (shared_ptr<const EncodedData> encoded, int frame)
 103 {
 104         boost::mutex::scoped_lock lock (_mutex);
 105
 106         QueueItem qi;
 107         qi.type = QueueItem::FULL;
 108         qi.encoded = encoded;
 109         qi.frame = frame;
 110         _queue.push_back (qi);
 111         ++_queued_full_in_memory;
 112
 113         _condition.notify_all ();
 114 }
 115
 116 void
 117 Writer::fake_write (int frame)
 118 {
 119         boost::mutex::scoped_lock lock (_mutex);
 120
 121         ifstream ifi (_film->info_path (frame).c_str());
 122         libdcp::FrameInfo info (ifi);
 123
 124         QueueItem qi;
 125         qi.type = QueueItem::FAKE;
 126         qi.size = info.size;
 127         qi.frame = frame;
 128         _queue.push_back (qi);
 129
 130         _condition.notify_all ();
 131 }
 132
 133 /** This method is not thread safe */
 134 void
 135 Writer::write (shared_ptr<const AudioBuffers> audio)
 136 {
 137         _sound_asset_writer->write (audio->data(), audio->frames());
 138 }
 139
 140 void
 141 Writer::thread ()
 142 try
 143 {
 144         while (1)
 145         {
 146                 boost::mutex::scoped_lock lock (_mutex);
 147
 148                 while (1) {
 149
 150                         _queue.sort ();
 151
 152                         if (_finish ||
 153                             _queued_full_in_memory > _maximum_frames_in_memory ||
 154                             (!_queue.empty() && _queue.front().frame == (_last_written_frame + 1))) {
 155
 156                                 break;
 157                         }
 158
 159                         TIMING (N_("writer sleeps with a queue of %1"), _queue.size());
 160                         _condition.wait (lock);
 161                         TIMING (N_("writer wakes with a queue of %1"), _queue.size());
 162                 }
 163
 164                 if (_finish && _queue.empty()) {
 165                         return;
 166                 }
 167
 168                 /* Write any frames that we can write; i.e. those that are in sequence */
 169                 while (!_queue.empty() && _queue.front().frame == (_last_written_frame + 1)) {
 170                         QueueItem qi = _queue.front ();
 171                         _queue.pop_front ();
 172                         if (qi.type == QueueItem::FULL && qi.encoded) {
 173                                 --_queued_full_in_memory;
 174                         }
 175
 176                         lock.unlock ();
 177                         switch (qi.type) {
 178                         case QueueItem::FULL:
 179                         {
 180                                 _film->log()->log (String::compose (N_("Writer FULL-writes %1 to MXF"), qi.frame));
 181                                 if (!qi.encoded) {
 182                                         qi.encoded.reset (new EncodedData (_film->j2c_path (qi.frame, false)));
 183                                 }
 184                                 libdcp::FrameInfo const fin = _picture_asset_writer->write (qi.encoded->data(), qi.encoded->size());
 185                                 qi.encoded->write_info (_film, qi.frame, fin);
 186                                 _last_written = qi.encoded;
 187                                 ++_full_written;
 188                                 break;
 189                         }
 190                         case QueueItem::FAKE:
 191                                 _film->log()->log (String::compose (N_("Writer FAKE-writes %1 to MXF"), qi.frame));
 192                                 _picture_asset_writer->fake_write (qi.size);
 193                                 _last_written.reset ();
 194                                 ++_fake_written;
 195                                 break;
 196                         case QueueItem::REPEAT:
 197                         {
 198                                 _film->log()->log (String::compose (N_("Writer REPEAT-writes %1 to MXF"), qi.frame));
 199                                 libdcp::FrameInfo const fin = _picture_asset_writer->write (_last_written->data(), _last_written->size());
 200                                 _last_written->write_info (_film, qi.frame, fin);
 201                                 ++_repeat_written;
 202                                 break;
 203                         }
 204                         }
 205                         lock.lock ();
 206
 207                         if (_film->length ()) {
 208                                 _job->set_progress (float(_full_written + _fake_written + _repeat_written) / _film->time_to_video_frames (_film->length()));
 209                         }
 210
 211                         ++_last_written_frame;
 212                 }
 213
 214                 while (_queued_full_in_memory > _maximum_frames_in_memory) {
 215                         /* Too many frames in memory which can't yet be written to the stream.
 216                            Write some FULL frames to disk.
 217                         */
 218
 219                         /* Find one */
 220                         list<QueueItem>::reverse_iterator i = _queue.rbegin ();
 221                         while (i != _queue.rend() && (i->type != QueueItem::FULL || !i->encoded)) {
 222                                 ++i;
 223                         }
 224
 225                         assert (i != _queue.rend());
 226                         QueueItem qi = *i;
 227
 228                         ++_pushed_to_disk;
 229
 230                         lock.unlock ();
 231                         _film->log()->log (String::compose (N_("Writer full (awaiting %1); pushes %2 to disk"), _last_written_frame + 1, qi.frame));
 232                         qi.encoded->write (_film, qi.frame);
 233                         lock.lock ();
 234                         qi.encoded.reset ();
 235                         --_queued_full_in_memory;
 236                 }
 237         }
 238 }
 239 catch (...)
 240 {
 241         store_current ();
 242 }
 243
 244 void
 245 Writer::finish ()
 246 {
 247         if (!_thread) {
 248                 return;
 249         }
 250
 251         boost::mutex::scoped_lock lock (_mutex);
 252         _finish = true;
 253         _condition.notify_all ();
 254         lock.unlock ();
 255
 256         _thread->join ();
 257         if (thrown ()) {
 258                 rethrow ();
 259         }
 260
 261         delete _thread;
 262         _thread = 0;
 263
 264         _picture_asset_writer->finalize ();
 265         _sound_asset_writer->finalize ();
 266
 267         int const frames = _last_written_frame + 1;
 268
 269         _picture_asset->set_duration (frames);
 270
 271         /* Hard-link the video MXF into the DCP */
 272
 273         boost::filesystem::path from;
 274         from /= _film->internal_video_mxf_dir();
 275         from /= _film->internal_video_mxf_filename();
 276
 277         boost::filesystem::path to;
 278         to /= _film->dir (_film->dcp_name());
 279         to /= _film->dcp_video_mxf_filename ();
 280
 281         boost::system::error_code ec;
 282         boost::filesystem::create_hard_link (from, to, ec);
 283         if (ec) {
 284                 /* hard link failed; copy instead */
 285                 boost::filesystem::copy_file (from, to);
 286                 _film->log()->log ("Hard-link failed; fell back to copying");
 287         }
 288
 289         /* And update the asset */
 290
 291         _picture_asset->set_directory (_film->dir (_film->dcp_name ()));
 292         _picture_asset->set_file_name (_film->dcp_video_mxf_filename ());
 293         _sound_asset->set_duration (frames);
 294
 295         libdcp::DCP dcp (_film->dir (_film->dcp_name()));
 296
 297         shared_ptr<libdcp::CPL> cpl (
 298                 new libdcp::CPL (
 299                         _film->dir (_film->dcp_name()),
 300                         _film->dcp_name(),
 301                         _film->dcp_content_type()->libdcp_kind (),
 302                         frames,
 303                         _film->dcp_video_frame_rate ()
 304                         )
 305                 );
 306
 307         dcp.add_cpl (cpl);
 308
 309         cpl->add_reel (shared_ptr<libdcp::Reel> (new libdcp::Reel (
 310                                                          _picture_asset,
 311                                                          _sound_asset,
 312                                                          shared_ptr<libdcp::SubtitleAsset> ()
 313                                                          )
 314                                ));
 315
 316         libdcp::XMLMetadata meta = Config::instance()->dcp_metadata ();
 317         meta.set_issue_date_now ();
 318         dcp.write_xml (meta);
 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->internal_video_mxf_dir ();
 345         p /= _film->internal_video_mxf_filename ();
 346         FILE* mxf = fopen (p.string().c_str(), "rb");
 347         if (!mxf) {
 348                 _film->log()->log (String::compose ("Could not open existing MXF at %1 (errno=%2)", p.string(), errno));
 349                 return;
 350         }
 351
 352         while (1) {
 353
 354                 /* Read the frame info as written */
 355                 ifstream ifi (_film->info_path (_first_nonexistant_frame).c_str());
 356                 libdcp::FrameInfo info (ifi);
 357
 358                 /* Read the data from the MXF and hash it */
 359                 fseek (mxf, info.offset, SEEK_SET);
 360                 EncodedData data (info.size);
 361                 fread (data.data(), 1, data.size(), mxf);
 362                 string const existing_hash = md5_digest (data.data(), data.size());
 363
 364                 if (existing_hash != info.hash) {
 365                         _film->log()->log (String::compose (N_("Existing frame %1 failed hash check"), _first_nonexistant_frame));
 366                         break;
 367                 }
 368
 369                 _film->log()->log (String::compose (N_("Have existing frame %1"), _first_nonexistant_frame));
 370                 ++_first_nonexistant_frame;
 371         }
 372
 373         fclose (mxf);
 374 }
 375
 376 /** @param frame Frame index.
 377  *  @return true if we can fake-write this frame.
 378  */
 379 bool
 380 Writer::can_fake_write (int frame) const
 381 {
 382         /* We have to do a proper write of the first frame so that we can set up the JPEG2000
 383            parameters in the MXF writer.
 384         */
 385         return (frame != 0 && frame < _first_nonexistant_frame);
 386 }
 387
 388 bool
 389 operator< (QueueItem const & a, QueueItem const & b)
 390 {
 391         return a.frame < b.frame;
 392 }
 393
 394 bool
 395 operator== (QueueItem const & a, QueueItem const & b)
 396 {
 397         return a.frame == b.frame;
 398 }