src/lib/ffmpeg_encoder.cc

   1 /*
   2     Copyright (C) 2017-2018 Carl Hetherington <cth@carlh.net>
   3
   4     This file is part of DCP-o-matic.
   5
   6     DCP-o-matic is free software; you can redistribute it and/or modify
   7     it under the terms of the GNU General Public License as published by
   8     the Free Software Foundation; either version 2 of the License, or
   9     (at your option) any later version.
  10
  11     DCP-o-matic is distributed in the hope that it will be useful,
  12     but WITHOUT ANY WARRANTY; without even the implied warranty of
  13     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14     GNU General Public License for more details.
  15
  16     You should have received a copy of the GNU General Public License
  17     along with DCP-o-matic.  If not, see <http://www.gnu.org/licenses/>.
  18
  19 */
  20
  21 #include "ffmpeg_encoder.h"
  22 #include "film.h"
  23 #include "job.h"
  24 #include "player.h"
  25 #include "player_video.h"
  26 #include "log.h"
  27 #include "image.h"
  28 #include "cross.h"
  29 #include "butler.h"
  30 #include "compose.hpp"
  31 #include <iostream>
  32
  33 #include "i18n.h"
  34
  35 using std::string;
  36 using std::runtime_error;
  37 using std::cout;
  38 using std::pair;
  39 using std::list;
  40 using std::map;
  41 using boost::shared_ptr;
  42 using boost::bind;
  43 using boost::weak_ptr;
  44 using boost::optional;
  45 using namespace dcpomatic;
  46
  47 /** @param key Key to use to encrypt MP4 outputs */
  48 FFmpegEncoder::FFmpegEncoder (
  49         shared_ptr<const Film> film,
  50         weak_ptr<Job> job,
  51         boost::filesystem::path output,
  52         ExportFormat format,
  53         bool mixdown_to_stereo,
  54         bool split_reels,
  55         int x264_crf
  56 #ifdef DCPOMATIC_VARIANT_SWAROOP
  57         , optional<dcp::Key> key
  58         , optional<string> id
  59 #endif
  60         )
  61         : Encoder (film, job)
  62         , _history (200)
  63 {
  64         int const files = split_reels ? film->reels().size() : 1;
  65         for (int i = 0; i < files; ++i) {
  66
  67                 boost::filesystem::path filename = output;
  68                 string extension = boost::filesystem::extension (filename);
  69                 filename = boost::filesystem::change_extension (filename, "");
  70
  71                 if (files > 1) {
  72                         /// TRANSLATORS: _reel%1 here is to be added to an export filename to indicate
  73                         /// which reel it is.  Preserve the %1; it will be replaced with the reel number.
  74                         filename = filename.string() + String::compose(_("_reel%1"), i + 1);
  75                 }
  76
  77                 _file_encoders.push_back (
  78                         FileEncoderSet (
  79                                 _film->frame_size(),
  80                                 _film->video_frame_rate(),
  81                                 _film->audio_frame_rate(),
  82                                 mixdown_to_stereo ? 2 : film->audio_channels(),
  83                                 format,
  84                                 x264_crf,
  85                                 _film->three_d(),
  86                                 filename,
  87                                 extension
  88 #ifdef DCPOMATIC_VARIANT_SWAROOP
  89                                 , key
  90                                 , id
  91 #endif
  92                                 )
  93                         );
  94         }
  95
  96         _player->set_always_burn_open_subtitles ();
  97         _player->set_play_referenced ();
  98
  99         int const ch = film->audio_channels ();
 100
 101         AudioMapping map;
 102         if (mixdown_to_stereo) {
 103                 _output_audio_channels = 2;
 104                 map = AudioMapping (ch, 2);
 105                 float const overall_gain = 2 / (4 + sqrt(2));
 106                 float const minus_3dB = 1 / sqrt(2);
 107                 if (ch == 2) {
 108                         map.set (dcp::LEFT, 0, 1);
 109                         map.set (dcp::RIGHT, 1, 1);
 110                 } else if (ch == 4) {
 111                         map.set (dcp::LEFT,   0, overall_gain);
 112                         map.set (dcp::RIGHT,  1, overall_gain);
 113                         map.set (dcp::CENTRE, 0, overall_gain * minus_3dB);
 114                         map.set (dcp::CENTRE, 1, overall_gain * minus_3dB);
 115                         map.set (dcp::LS,     0, overall_gain);
 116                 } else if (ch >= 6) {
 117                         map.set (dcp::LEFT,   0, overall_gain);
 118                         map.set (dcp::RIGHT,  1, overall_gain);
 119                         map.set (dcp::CENTRE, 0, overall_gain * minus_3dB);
 120                         map.set (dcp::CENTRE, 1, overall_gain * minus_3dB);
 121                         map.set (dcp::LS,     0, overall_gain);
 122                         map.set (dcp::RS,     1, overall_gain);
 123                 }
 124                 /* XXX: maybe we should do something better for >6 channel DCPs */
 125         } else {
 126                 _output_audio_channels = ch;
 127                 map = AudioMapping (ch, ch);
 128                 for (int i = 0; i < ch; ++i) {
 129                         map.set (i, i, 1);
 130                 }
 131         }
 132
 133         _butler.reset (new Butler(_player, map, _output_audio_channels, bind(&PlayerVideo::force, _1, FFmpegFileEncoder::pixel_format(format)), true, false));
 134 }
 135
 136 void
 137 FFmpegEncoder::go ()
 138 {
 139         {
 140                 shared_ptr<Job> job = _job.lock ();
 141                 DCPOMATIC_ASSERT (job);
 142                 job->sub (_("Encoding"));
 143         }
 144
 145         Waker waker;
 146
 147         list<DCPTimePeriod> reel_periods = _film->reels ();
 148         list<DCPTimePeriod>::const_iterator reel = reel_periods.begin ();
 149         list<FileEncoderSet>::iterator encoder = _file_encoders.begin ();
 150
 151         DCPTime const video_frame = DCPTime::from_frames (1, _film->video_frame_rate ());
 152         int const audio_frames = video_frame.frames_round(_film->audio_frame_rate());
 153         float* interleaved = new float[_output_audio_channels * audio_frames];
 154         shared_ptr<AudioBuffers> deinterleaved (new AudioBuffers (_output_audio_channels, audio_frames));
 155         int const gets_per_frame = _film->three_d() ? 2 : 1;
 156         for (DCPTime i; i < _film->length(); i += video_frame) {
 157
 158                 if (_file_encoders.size() > 1 && !reel->contains(i)) {
 159                         /* Next reel and file */
 160                         ++reel;
 161                         ++encoder;
 162                         DCPOMATIC_ASSERT (reel != reel_periods.end());
 163                         DCPOMATIC_ASSERT (encoder != _file_encoders.end());
 164                 }
 165
 166                 for (int j = 0; j < gets_per_frame; ++j) {
 167                         Butler::Error e;
 168                         pair<shared_ptr<PlayerVideo>, DCPTime> v = _butler->get_video (true, &e);
 169                         if (!v.first) {
 170                                 throw ProgrammingError(__FILE__, __LINE__, String::compose("butler returned no video; error was %1", static_cast<int>(e)));
 171                         }
 172                         shared_ptr<FFmpegFileEncoder> fe = encoder->get (v.first->eyes());
 173                         if (fe) {
 174                                 fe->video(v.first, v.second);
 175                         }
 176                 }
 177
 178                 _history.event ();
 179
 180                 {
 181                         boost::mutex::scoped_lock lm (_mutex);
 182                         _last_time = i;
 183                 }
 184
 185                 shared_ptr<Job> job = _job.lock ();
 186                 if (job) {
 187                         job->set_progress (float(i.get()) / _film->length().get());
 188                 }
 189
 190                 waker.nudge ();
 191
 192                 _butler->get_audio (interleaved, audio_frames);
 193                 /* XXX: inefficient; butler interleaves and we deinterleave again */
 194                 float* p = interleaved;
 195                 for (int j = 0; j < audio_frames; ++j) {
 196                         for (int k = 0; k < _output_audio_channels; ++k) {
 197                                 deinterleaved->data(k)[j] = *p++;
 198                         }
 199                 }
 200                 encoder->audio (deinterleaved);
 201         }
 202         delete[] interleaved;
 203
 204         BOOST_FOREACH (FileEncoderSet i, _file_encoders) {
 205                 i.flush ();
 206         }
 207 }
 208
 209 optional<float>
 210 FFmpegEncoder::current_rate () const
 211 {
 212         return _history.rate ();
 213 }
 214
 215 Frame
 216 FFmpegEncoder::frames_done () const
 217 {
 218         boost::mutex::scoped_lock lm (_mutex);
 219         return _last_time.frames_round (_film->video_frame_rate ());
 220 }
 221
 222 FFmpegEncoder::FileEncoderSet::FileEncoderSet (
 223         dcp::Size video_frame_size,
 224         int video_frame_rate,
 225         int audio_frame_rate,
 226         int channels,
 227         ExportFormat format,
 228         int x264_crf,
 229         bool three_d,
 230         boost::filesystem::path output,
 231         string extension
 232 #ifdef DCPOMATIC_VARIANT_SWAROOP
 233         , optional<dcp::Key> key
 234         , optional<string> id
 235 #endif
 236         )
 237 {
 238         if (three_d) {
 239                 /// TRANSLATORS: L here is an abbreviation for "left", to indicate the left-eye part of a 3D export
 240                 _encoders[EYES_LEFT] = shared_ptr<FFmpegFileEncoder>(
 241                         new FFmpegFileEncoder(video_frame_size, video_frame_rate, audio_frame_rate, channels, format, x264_crf, String::compose("%1_%2%3", output.string(), _("L"), extension)
 242 #ifdef DCPOMATIC_VARIANT_SWAROOP
 243                                               , key, id
 244 #endif
 245                                 )
 246                         );
 247                 /// TRANSLATORS: R here is an abbreviation for "right", to indicate the right-eye part of a 3D export
 248                 _encoders[EYES_RIGHT] = shared_ptr<FFmpegFileEncoder>(
 249                         new FFmpegFileEncoder(video_frame_size, video_frame_rate, audio_frame_rate, channels, format, x264_crf, String::compose("%1_%2%3", output.string(), _("R"), extension)
 250 #ifdef DCPOMATIC_VARIANT_SWAROOP
 251                                               , key, id
 252 #endif
 253                                 )
 254                         );
 255         } else {
 256                 _encoders[EYES_BOTH]  = shared_ptr<FFmpegFileEncoder>(
 257                         new FFmpegFileEncoder(video_frame_size, video_frame_rate, audio_frame_rate, channels, format, x264_crf, String::compose("%1%2", output.string(), extension)
 258 #ifdef DCPOMATIC_VARIANT_SWAROOP
 259                                               , key, id
 260 #endif
 261                                 )
 262                         );
 263         }
 264 }
 265
 266 shared_ptr<FFmpegFileEncoder>
 267 FFmpegEncoder::FileEncoderSet::get (Eyes eyes) const
 268 {
 269         if (_encoders.size() == 1) {
 270                 /* We are doing a 2D export... */
 271                 if (eyes == EYES_LEFT) {
 272                         /* ...but we got some 3D data; put the left eye into the output... */
 273                         eyes = EYES_BOTH;
 274                 } else if (eyes == EYES_RIGHT) {
 275                         /* ...and ignore the right eye.*/
 276                         return shared_ptr<FFmpegFileEncoder>();
 277                 }
 278         }
 279
 280         map<Eyes, boost::shared_ptr<FFmpegFileEncoder> >::const_iterator i = _encoders.find (eyes);
 281         DCPOMATIC_ASSERT (i != _encoders.end());
 282         return i->second;
 283 }
 284
 285 void
 286 FFmpegEncoder::FileEncoderSet::flush ()
 287 {
 288         for (map<Eyes, boost::shared_ptr<FFmpegFileEncoder> >::iterator i = _encoders.begin(); i != _encoders.end(); ++i) {
 289                 i->second->flush ();
 290         }
 291 }
 292
 293 void
 294 FFmpegEncoder::FileEncoderSet::audio (shared_ptr<AudioBuffers> a)
 295 {
 296         for (map<Eyes, boost::shared_ptr<FFmpegFileEncoder> >::iterator i = _encoders.begin(); i != _encoders.end(); ++i) {
 297                 i->second->audio (a);
 298         }
 299 }