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 namespace dcpomatic;
  45
  46 FFmpegEncoder::FFmpegEncoder (
  47         shared_ptr<const Film> film,
  48         weak_ptr<Job> job,
  49         boost::filesystem::path output,
  50         ExportFormat format,
  51         bool mixdown_to_stereo,
  52         bool split_reels,
  53         int x264_crf
  54         )
  55         : Encoder (film, job)
  56         , _history (1000)
  57 {
  58         int const files = split_reels ? film->reels().size() : 1;
  59         for (int i = 0; i < files; ++i) {
  60
  61                 boost::filesystem::path filename = output;
  62                 string extension = boost::filesystem::extension (filename);
  63                 filename = boost::filesystem::change_extension (filename, "");
  64
  65                 if (files > 1) {
  66                         /// TRANSLATORS: _reel%1 here is to be added to an export filename to indicate
  67                         /// which reel it is.  Preserve the %1; it will be replaced with the reel number.
  68                         filename = filename.string() + String::compose(_("_reel%1"), i + 1);
  69                 }
  70
  71                 _file_encoders.push_back (
  72                         FileEncoderSet (
  73                                 _film->frame_size(),
  74                                 _film->video_frame_rate(),
  75                                 _film->audio_frame_rate(),
  76                                 mixdown_to_stereo ? 2 : film->audio_channels(),
  77                                 format,
  78                                 x264_crf,
  79                                 _film->three_d(),
  80                                 filename,
  81                                 extension
  82                                 )
  83                         );
  84         }
  85
  86         _player->set_always_burn_open_subtitles ();
  87         _player->set_play_referenced ();
  88
  89         int const ch = film->audio_channels ();
  90
  91         AudioMapping map;
  92         if (mixdown_to_stereo) {
  93                 _output_audio_channels = 2;
  94                 map = AudioMapping (ch, 2);
  95                 float const overall_gain = 2 / (4 + sqrt(2));
  96                 float const minus_3dB = 1 / sqrt(2);
  97                 map.set (dcp::LEFT,   0, overall_gain);
  98                 map.set (dcp::RIGHT,  1, overall_gain);
  99                 map.set (dcp::CENTRE, 0, overall_gain * minus_3dB);
 100                 map.set (dcp::CENTRE, 1, overall_gain * minus_3dB);
 101                 map.set (dcp::LS,     0, overall_gain);
 102                 map.set (dcp::RS,     1, overall_gain);
 103         } else {
 104                 _output_audio_channels = ch;
 105                 map = AudioMapping (ch, ch);
 106                 for (int i = 0; i < ch; ++i) {
 107                         map.set (i, i, 1);
 108                 }
 109         }
 110
 111         _butler.reset (new Butler(_player, map, _output_audio_channels, bind(&PlayerVideo::force, _1, FFmpegFileEncoder::pixel_format(format)), true, false));
 112 }
 113
 114 void
 115 FFmpegEncoder::go ()
 116 {
 117         {
 118                 shared_ptr<Job> job = _job.lock ();
 119                 DCPOMATIC_ASSERT (job);
 120                 job->sub (_("Encoding"));
 121         }
 122
 123         list<DCPTimePeriod> reel_periods = _film->reels ();
 124         list<DCPTimePeriod>::const_iterator reel = reel_periods.begin ();
 125         list<FileEncoderSet>::iterator encoder = _file_encoders.begin ();
 126
 127         DCPTime const video_frame = DCPTime::from_frames (1, _film->video_frame_rate ());
 128         int const audio_frames = video_frame.frames_round(_film->audio_frame_rate());
 129         float* interleaved = new float[_output_audio_channels * audio_frames];
 130         shared_ptr<AudioBuffers> deinterleaved (new AudioBuffers (_output_audio_channels, audio_frames));
 131         int const gets_per_frame = _film->three_d() ? 2 : 1;
 132         for (DCPTime i; i < _film->length(); i += video_frame) {
 133
 134                 if (_file_encoders.size() > 1 && !reel->contains(i)) {
 135                         /* Next reel and file */
 136                         ++reel;
 137                         ++encoder;
 138                         DCPOMATIC_ASSERT (reel != reel_periods.end());
 139                         DCPOMATIC_ASSERT (encoder != _file_encoders.end());
 140                 }
 141
 142                 for (int j = 0; j < gets_per_frame; ++j) {
 143                         pair<shared_ptr<PlayerVideo>, DCPTime> v = _butler->get_video ();
 144                         encoder->get(v.first->eyes())->video(v.first, v.second);
 145                 }
 146
 147                 _history.event ();
 148
 149                 {
 150                         boost::mutex::scoped_lock lm (_mutex);
 151                         _last_time = i;
 152                 }
 153
 154                 shared_ptr<Job> job = _job.lock ();
 155                 if (job) {
 156                         job->set_progress (float(i.get()) / _film->length().get());
 157                 }
 158
 159                 _butler->get_audio (interleaved, audio_frames);
 160                 /* XXX: inefficient; butler interleaves and we deinterleave again */
 161                 float* p = interleaved;
 162                 for (int j = 0; j < audio_frames; ++j) {
 163                         for (int k = 0; k < _output_audio_channels; ++k) {
 164                                 deinterleaved->data(k)[j] = *p++;
 165                         }
 166                 }
 167                 encoder->audio (deinterleaved);
 168         }
 169         delete[] interleaved;
 170
 171         BOOST_FOREACH (FileEncoderSet i, _file_encoders) {
 172                 i.flush ();
 173         }
 174 }
 175
 176 float
 177 FFmpegEncoder::current_rate () const
 178 {
 179         return _history.rate ();
 180 }
 181
 182 Frame
 183 FFmpegEncoder::frames_done () const
 184 {
 185         boost::mutex::scoped_lock lm (_mutex);
 186         return _last_time.frames_round (_film->video_frame_rate ());
 187 }
 188
 189 FFmpegEncoder::FileEncoderSet::FileEncoderSet (
 190         dcp::Size video_frame_size,
 191         int video_frame_rate,
 192         int audio_frame_rate,
 193         int channels,
 194         ExportFormat format,
 195         int x264_crf,
 196         bool three_d,
 197         boost::filesystem::path output,
 198         string extension
 199         )
 200 {
 201         if (three_d) {
 202                 /// TRANSLATORS: L here is an abbreviation for "left", to indicate the left-eye part of a 3D export
 203                 _encoders[EYES_LEFT] = shared_ptr<FFmpegFileEncoder>(
 204                         new FFmpegFileEncoder(video_frame_size, video_frame_rate, audio_frame_rate, channels, format, x264_crf, String::compose("%1_%2%3", output.string(), _("L"), extension))
 205                         );
 206                 /// TRANSLATORS: R here is an abbreviation for "right", to indicate the right-eye part of a 3D export
 207                 _encoders[EYES_RIGHT] = shared_ptr<FFmpegFileEncoder>(
 208                         new FFmpegFileEncoder(video_frame_size, video_frame_rate, audio_frame_rate, channels, format, x264_crf, String::compose("%1_%2%3", output.string(), _("R"), extension))
 209                         );
 210         } else {
 211                 _encoders[EYES_BOTH]  = shared_ptr<FFmpegFileEncoder>(
 212                         new FFmpegFileEncoder(video_frame_size, video_frame_rate, audio_frame_rate, channels, format, x264_crf, String::compose("%1%2", output.string(), extension))
 213                         );
 214         }
 215 }
 216
 217 shared_ptr<FFmpegFileEncoder>
 218 FFmpegEncoder::FileEncoderSet::get (Eyes eyes) const
 219 {
 220         map<Eyes, boost::shared_ptr<FFmpegFileEncoder> >::const_iterator i = _encoders.find (eyes);
 221         DCPOMATIC_ASSERT (i != _encoders.end());
 222         return i->second;
 223 }
 224
 225 void
 226 FFmpegEncoder::FileEncoderSet::flush ()
 227 {
 228         for (map<Eyes, boost::shared_ptr<FFmpegFileEncoder> >::iterator i = _encoders.begin(); i != _encoders.end(); ++i) {
 229                 i->second->flush ();
 230         }
 231 }
 232
 233 void
 234 FFmpegEncoder::FileEncoderSet::audio (shared_ptr<AudioBuffers> a)
 235 {
 236         for (map<Eyes, boost::shared_ptr<FFmpegFileEncoder> >::iterator i = _encoders.begin(); i != _encoders.end(); ++i) {
 237                 i->second->audio (a);
 238         }
 239 }