src/lib/player.cc

   1 /*
   2     Copyright (C) 2013 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 "player.h"
  21 #include "film.h"
  22 #include "ffmpeg_decoder.h"
  23 #include "ffmpeg_content.h"
  24 #include "imagemagick_decoder.h"
  25 #include "imagemagick_content.h"
  26 #include "sndfile_decoder.h"
  27 #include "sndfile_content.h"
  28 #include "playlist.h"
  29 #include "job.h"
  30
  31 using std::list;
  32 using std::cout;
  33 using boost::shared_ptr;
  34 using boost::weak_ptr;
  35 using boost::dynamic_pointer_cast;
  36
  37 Player::Player (shared_ptr<const Film> f, shared_ptr<const Playlist> p)
  38         : _film (f)
  39         , _playlist (p)
  40         , _video (true)
  41         , _audio (true)
  42         , _subtitles (true)
  43         , _have_valid_decoders (false)
  44         , _video_sync (true)
  45 {
  46         _playlist->Changed.connect (bind (&Player::playlist_changed, this));
  47         _playlist->ContentChanged.connect (bind (&Player::content_changed, this, _1, _2));
  48 }
  49
  50 void
  51 Player::disable_video ()
  52 {
  53         _video = false;
  54 }
  55
  56 void
  57 Player::disable_audio ()
  58 {
  59         _audio = false;
  60 }
  61
  62 void
  63 Player::disable_subtitles ()
  64 {
  65         _subtitles = false;
  66 }
  67
  68 bool
  69 Player::pass ()
  70 {
  71         if (!_have_valid_decoders) {
  72                 setup_decoders ();
  73                 _have_valid_decoders = true;
  74         }
  75
  76         bool done = true;
  77
  78         if (_video_decoder != _video_decoders.end ()) {
  79                 if ((*_video_decoder)->pass ()) {
  80                         _video_decoder++;
  81                 }
  82
  83                 if (_video_decoder != _video_decoders.end ()) {
  84                         done = false;
  85                 }
  86         }
  87
  88         if (_playlist->audio_from() == Playlist::AUDIO_SNDFILE) {
  89                 for (list<shared_ptr<SndfileDecoder> >::iterator i = _sndfile_decoders.begin(); i != _sndfile_decoders.end(); ++i) {
  90                         if (!(*i)->pass ()) {
  91                                 done = false;
  92                         }
  93                 }
  94
  95                 Audio (_sndfile_buffers);
  96                 _sndfile_buffers.reset ();
  97         }
  98
  99         return done;
 100 }
 101
 102 void
 103 Player::set_progress (shared_ptr<Job> job)
 104 {
 105         /* Assume progress can be divined from how far through the video we are */
 106
 107         if (_video_decoder == _video_decoders.end() || !_playlist->video_length()) {
 108                 return;
 109         }
 110
 111         ContentVideoFrame p = 0;
 112         list<shared_ptr<VideoDecoder> >::iterator i = _video_decoders.begin ();
 113         while (i != _video_decoders.end() && i != _video_decoder) {
 114                 p += (*i)->video_length ();
 115         }
 116
 117         job->set_progress (float ((*_video_decoder)->video_frame ()) / _playlist->video_length ());
 118 }
 119
 120 void
 121 Player::process_video (shared_ptr<Image> i, bool same, shared_ptr<Subtitle> s)
 122 {
 123         Video (i, same, s);
 124 }
 125
 126 void
 127 Player::process_audio (weak_ptr<const AudioContent> c, shared_ptr<AudioBuffers> b)
 128 {
 129         if (_playlist->audio_from() == Playlist::AUDIO_SNDFILE) {
 130                 AudioMapping mapping = _film->audio_mapping ();
 131                 if (!_sndfile_buffers) {
 132                         _sndfile_buffers.reset (new AudioBuffers (mapping.dcp_channels(), b->frames ()));
 133                         _sndfile_buffers->make_silent ();
 134                 }
 135
 136                 for (int i = 0; i < b->channels(); ++i) {
 137                         list<libdcp::Channel> dcp = mapping.content_to_dcp (AudioMapping::Channel (c, i));
 138                         for (list<libdcp::Channel>::iterator j = dcp.begin(); j != dcp.end(); ++j) {
 139                                 _sndfile_buffers->accumulate (b, i, static_cast<int> (*j));
 140                         }
 141                 }
 142
 143         } else {
 144                 Audio (b);
 145         }
 146 }
 147
 148 /** @return true on error */
 149 bool
 150 Player::seek (double t)
 151 {
 152         if (!_have_valid_decoders) {
 153                 setup_decoders ();
 154                 _have_valid_decoders = true;
 155         }
 156
 157         /* Find the decoder that contains this position */
 158         _video_decoder = _video_decoders.begin ();
 159         while (_video_decoder != _video_decoders.end ()) {
 160                 double const this_length = (*_video_decoder)->video_length() / _film->video_frame_rate ();
 161                 if (t < this_length) {
 162                         break;
 163                 }
 164                 t -= this_length;
 165                 ++_video_decoder;
 166         }
 167
 168         if (_video_decoder != _video_decoders.end()) {
 169                 (*_video_decoder)->seek (t);
 170         } else {
 171                 return true;
 172         }
 173
 174         /* XXX: don't seek audio because we don't need to... */
 175
 176         return false;
 177 }
 178
 179 void
 180 Player::setup_decoders ()
 181 {
 182         if (_video) {
 183                 list<shared_ptr<const VideoContent> > vc = _playlist->video ();
 184                 for (list<shared_ptr<const VideoContent> >::iterator i = vc.begin(); i != vc.end(); ++i) {
 185
 186                         shared_ptr<VideoDecoder> d;
 187
 188                         /* XXX: into content? */
 189
 190                         shared_ptr<const FFmpegContent> fc = dynamic_pointer_cast<const FFmpegContent> (*i);
 191                         if (fc) {
 192                                 shared_ptr<FFmpegDecoder> fd (
 193                                         new FFmpegDecoder (
 194                                                 _film, fc, _video,
 195                                                 _audio && _playlist->audio_from() == Playlist::AUDIO_FFMPEG,
 196                                                 _subtitles && _film->with_subtitles(),
 197                                                 _video_sync
 198                                                 )
 199                                         );
 200
 201                                 if (_playlist->audio_from() == Playlist::AUDIO_FFMPEG) {
 202                                         fd->Audio.connect (bind (&Player::process_audio, this, fc, _1));
 203                                 }
 204
 205                                 d = fd;
 206                         }
 207
 208                         shared_ptr<const ImageMagickContent> ic = dynamic_pointer_cast<const ImageMagickContent> (*i);
 209                         if (ic) {
 210                                 d.reset (new ImageMagickDecoder (_film, ic));
 211                         }
 212
 213                         d->connect_video (shared_from_this ());
 214                         _video_decoders.push_back (d);
 215                 }
 216
 217                 _video_decoder = _video_decoders.begin ();
 218         }
 219
 220         if (_audio && _playlist->audio_from() == Playlist::AUDIO_SNDFILE) {
 221                 list<shared_ptr<const SndfileContent> > sc = _playlist->sndfile ();
 222                 for (list<shared_ptr<const SndfileContent> >::iterator i = sc.begin(); i != sc.end(); ++i) {
 223                         shared_ptr<SndfileDecoder> d (new SndfileDecoder (_film, *i));
 224                         _sndfile_decoders.push_back (d);
 225                         d->Audio.connect (bind (&Player::process_audio, this, *i, _1));
 226                 }
 227         }
 228 }
 229
 230 void
 231 Player::disable_video_sync ()
 232 {
 233         _video_sync = false;
 234 }
 235
 236 double
 237 Player::last_video_time () const
 238 {
 239         double t = 0;
 240         for (list<shared_ptr<VideoDecoder> >::const_iterator i = _video_decoders.begin(); i != _video_decoder; ++i) {
 241                 t += (*i)->video_length() / (*i)->video_frame_rate ();
 242         }
 243
 244         return t + (*_video_decoder)->last_content_time ();
 245 }
 246
 247 void
 248 Player::content_changed (weak_ptr<Content> w, int p)
 249 {
 250         shared_ptr<Content> c = w.lock ();
 251         if (!c) {
 252                 return;
 253         }
 254
 255         if (p == VideoContentProperty::VIDEO_LENGTH) {
 256                 if (dynamic_pointer_cast<FFmpegContent> (c)) {
 257                         /* FFmpeg content length changes are serious; we need new decoders */
 258                         _have_valid_decoders = false;
 259                 }
 260         }
 261 }
 262
 263 void
 264 Player::playlist_changed ()
 265 {
 266         _have_valid_decoders = false;
 267 }