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 <libdcp/dcp.h>
  26 #include "writer.h"
  27 #include "compose.hpp"
  28 #include "film.h"
  29 #include "format.h"
  30 #include "log.h"
  31 #include "dcp_video_frame.h"
  32 #include "dcp_content_type.h"
  33 #include "player.h"
  34
  35 #include "i18n.h"
  36
  37 using std::make_pair;
  38 using std::pair;
  39 using std::string;
  40 using std::ifstream;
  41 using std::list;
  42 using std::cout;
  43 using boost::shared_ptr;
  44
  45 int const Writer::_maximum_frames_in_memory = 8;
  46
  47 Writer::Writer (shared_ptr<Film> f)
  48         : _film (f)
  49         , _first_nonexistant_frame (0)
  50         , _thread (0)
  51         , _finish (false)
  52         , _queued_full_in_memory (0)
  53         , _last_written_frame (-1)
  54         , _full_written (0)
  55         , _fake_written (0)
  56         , _repeat_written (0)
  57         , _pushed_to_disk (0)
  58 {
  59         /* Remove any old DCP */
  60         boost::filesystem::remove_all (_film->dir (_film->dcp_name ()));
  61
  62         check_existing_picture_mxf ();
  63
  64         /* Create our picture asset in a subdirectory, named according to those
  65            film's parameters which affect the video output.  We will hard-link
  66            it into the DCP later.
  67         */
  68
  69         _picture_asset.reset (
  70                 new libdcp::MonoPictureAsset (
  71                         _film->video_mxf_dir (),
  72                         _film->video_mxf_filename (),
  73                         _film->dcp_frame_rate (),
  74                         _film->format()->dcp_size ()
  75                         )
  76                 );
  77
  78         _picture_asset_writer = _picture_asset->start_write (_first_nonexistant_frame > 0);
  79
  80         AudioMapping m (_film->audio_channels ());
  81
  82         if (m.dcp_channels() > 0) {
  83                 _sound_asset.reset (
  84                         new libdcp::SoundAsset (
  85                                 _film->dir (_film->dcp_name()),
  86                                 N_("audio.mxf"),
  87                                 _film->dcp_frame_rate (),
  88                                 m.dcp_channels (),
  89                                 dcp_audio_sample_rate (_film->audio_frame_rate())
  90                                 )
  91                         );
  92
  93                 _sound_asset_writer = _sound_asset->start_write ();
  94         }
  95
  96         _thread = new boost::thread (boost::bind (&Writer::thread, this));
  97 }
  98
  99 void
 100 Writer::write (shared_ptr<const EncodedData> encoded, int frame)
 101 {
 102         boost::mutex::scoped_lock lock (_mutex);
 103
 104         QueueItem qi;
 105         qi.type = QueueItem::FULL;
 106         qi.encoded = encoded;
 107         qi.frame = frame;
 108         _queue.push_back (qi);
 109         ++_queued_full_in_memory;
 110
 111         _condition.notify_all ();
 112 }
 113
 114 void
 115 Writer::fake_write (int frame)
 116 {
 117         boost::mutex::scoped_lock lock (_mutex);
 118
 119         ifstream ifi (_film->info_path (frame).c_str());
 120         libdcp::FrameInfo info (ifi);
 121
 122         QueueItem qi;
 123         qi.type = QueueItem::FAKE;
 124         qi.size = info.size;
 125         qi.frame = frame;
 126         _queue.push_back (qi);
 127
 128         _condition.notify_all ();
 129 }
 130
 131 /** This method is not thread safe */
 132 void
 133 Writer::write (shared_ptr<const AudioBuffers> audio)
 134 {
 135         _sound_asset_writer->write (audio->data(), audio->frames());
 136 }
 137
 138 void
 139 Writer::thread ()
 140 try
 141 {
 142         while (1)
 143         {
 144                 boost::mutex::scoped_lock lock (_mutex);
 145
 146                 while (1) {
 147
 148                         _queue.sort ();
 149
 150                         if (_finish ||
 151                             _queued_full_in_memory > _maximum_frames_in_memory ||
 152                             (!_queue.empty() && _queue.front().frame == (_last_written_frame + 1))) {
 153
 154                                 break;
 155                         }
 156
 157                         TIMING (N_("writer sleeps with a queue of %1"), _queue.size());
 158                         _condition.wait (lock);
 159                         TIMING (N_("writer wakes with a queue of %1"), _queue.size());
 160                 }
 161
 162                 if (_finish && _queue.empty()) {
 163                         return;
 164                 }
 165
 166                 /* Write any frames that we can write; i.e. those that are in sequence */
 167                 while (!_queue.empty() && _queue.front().frame == (_last_written_frame + 1)) {
 168                         QueueItem qi = _queue.front ();
 169                         _queue.pop_front ();
 170                         if (qi.type == QueueItem::FULL && qi.encoded) {
 171                                 --_queued_full_in_memory;
 172                         }
 173
 174                         lock.unlock ();
 175                         switch (qi.type) {
 176                         case QueueItem::FULL:
 177                         {
 178                                 _film->log()->log (String::compose (N_("Writer FULL-writes %1 to MXF"), qi.frame));
 179                                 if (!qi.encoded) {
 180                                         qi.encoded.reset (new EncodedData (_film->j2c_path (qi.frame, false)));
 181                                 }
 182                                 libdcp::FrameInfo const fin = _picture_asset_writer->write (qi.encoded->data(), qi.encoded->size());
 183                                 qi.encoded->write_info (_film, qi.frame, fin);
 184                                 _last_written = qi.encoded;
 185                                 ++_full_written;
 186                                 break;
 187                         }
 188                         case QueueItem::FAKE:
 189                                 _film->log()->log (String::compose (N_("Writer FAKE-writes %1 to MXF"), qi.frame));
 190                                 _picture_asset_writer->fake_write (qi.size);
 191                                 _last_written.reset ();
 192                                 ++_fake_written;
 193                                 break;
 194                         case QueueItem::REPEAT:
 195                         {
 196                                 _film->log()->log (String::compose (N_("Writer REPEAT-writes %1 to MXF"), qi.frame));
 197                                 libdcp::FrameInfo const fin = _picture_asset_writer->write (_last_written->data(), _last_written->size());
 198                                 _last_written->write_info (_film, qi.frame, fin);
 199                                 ++_repeat_written;
 200                                 break;
 201                         }
 202                         }
 203                         lock.lock ();
 204
 205                         ++_last_written_frame;
 206                 }
 207
 208                 while (_queued_full_in_memory > _maximum_frames_in_memory) {
 209                         /* Too many frames in memory which can't yet be written to the stream.
 210                            Write some FULL frames to disk.
 211                         */
 212
 213                         /* Find one */
 214                         list<QueueItem>::reverse_iterator i = _queue.rbegin ();
 215                         while (i != _queue.rend() && (i->type != QueueItem::FULL || !i->encoded)) {
 216                                 ++i;
 217                         }
 218
 219                         assert (i != _queue.rend());
 220                         QueueItem qi = *i;
 221
 222                         ++_pushed_to_disk;
 223
 224                         lock.unlock ();
 225                         _film->log()->log (String::compose (N_("Writer full (awaiting %1); pushes %2 to disk"), _last_written_frame + 1, qi.frame));
 226                         qi.encoded->write (_film, qi.frame);
 227                         lock.lock ();
 228                         qi.encoded.reset ();
 229                         --_queued_full_in_memory;
 230                 }
 231         }
 232 }
 233 catch (...)
 234 {
 235         store_current ();
 236 }
 237
 238 void
 239 Writer::finish ()
 240 {
 241         if (!_thread) {
 242                 return;
 243         }
 244
 245         boost::mutex::scoped_lock lock (_mutex);
 246         _finish = true;
 247         _condition.notify_all ();
 248         lock.unlock ();
 249
 250         _thread->join ();
 251         if (thrown ()) {
 252                 rethrow ();
 253         }
 254
 255         delete _thread;
 256         _thread = 0;
 257
 258         _picture_asset_writer->finalize ();
 259
 260         if (_sound_asset_writer) {
 261                 _sound_asset_writer->finalize ();
 262         }
 263
 264         int const frames = _last_written_frame + 1;
 265         int const duration = frames - _film->trim_start() - _film->trim_end();
 266
 267         _picture_asset->set_entry_point (_film->trim_start ());
 268         _picture_asset->set_duration (duration);
 269
 270         /* Hard-link the video MXF into the DCP */
 271
 272         boost::filesystem::path from;
 273         from /= _film->video_mxf_dir();
 274         from /= _film->video_mxf_filename();
 275
 276         boost::filesystem::path to;
 277         to /= _film->dir (_film->dcp_name());
 278         to /= N_("video.mxf");
 279
 280         boost::system::error_code ec;
 281         boost::filesystem::create_hard_link (from, to, ec);
 282         if (ec) {
 283                 /* hard link failed; copy instead */
 284                 boost::filesystem::copy_file (from, to);
 285                 _film->log()->log ("Hard-link failed; fell back to copying");
 286         }
 287
 288         /* And update the asset */
 289
 290         _picture_asset->set_directory (_film->dir (_film->dcp_name ()));
 291         _picture_asset->set_file_name (N_("video.mxf"));
 292
 293         if (_sound_asset) {
 294                 _sound_asset->set_entry_point (_film->trim_start ());
 295                 _sound_asset->set_duration (duration);
 296         }
 297
 298         libdcp::DCP dcp (_film->dir (_film->dcp_name()));
 299
 300         shared_ptr<libdcp::CPL> cpl (
 301                 new libdcp::CPL (
 302                         _film->dir (_film->dcp_name()),
 303                         _film->dcp_name(),
 304                         _film->dcp_content_type()->libdcp_kind (),
 305                         frames,
 306                         _film->dcp_frame_rate ()
 307                         )
 308                 );
 309
 310         dcp.add_cpl (cpl);
 311
 312         cpl->add_reel (shared_ptr<libdcp::Reel> (new libdcp::Reel (
 313                                                          _picture_asset,
 314                                                          _sound_asset,
 315                                                          shared_ptr<libdcp::SubtitleAsset> ()
 316                                                          )
 317                                ));
 318
 319         dcp.write_xml ();
 320
 321         _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));
 322 }
 323
 324 /** Tell the writer that frame `f' should be a repeat of the frame before it */
 325 void
 326 Writer::repeat (int f)
 327 {
 328         boost::mutex::scoped_lock lock (_mutex);
 329
 330         QueueItem qi;
 331         qi.type = QueueItem::REPEAT;
 332         qi.frame = f;
 333
 334         _queue.push_back (qi);
 335
 336         _condition.notify_all ();
 337 }
 338
 339
 340 void
 341 Writer::check_existing_picture_mxf ()
 342 {
 343         /* Try to open the existing MXF */
 344         boost::filesystem::path p;
 345         p /= _film->video_mxf_dir ();
 346         p /= _film->video_mxf_filename ();
 347         FILE* mxf = fopen (p.string().c_str(), N_("rb"));
 348         if (!mxf) {
 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 }