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 {
  45         _playlist->Changed.connect (bind (&Player::playlist_changed, this));
  46         _playlist->ContentChanged.connect (bind (&Player::content_changed, this, _1, _2));
  47 }
  48
  49 void
  50 Player::disable_video ()
  51 {
  52         _video = false;
  53 }
  54
  55 void
  56 Player::disable_audio ()
  57 {
  58         _audio = false;
  59 }
  60
  61 void
  62 Player::disable_subtitles ()
  63 {
  64         _subtitles = false;
  65 }
  66
  67 bool
  68 Player::pass ()
  69 {
  70         if (!_have_valid_decoders) {
  71                 setup_decoders ();
  72                 _have_valid_decoders = true;
  73         }
  74
  75         bool done = true;
  76
  77         if (_video_decoder != _video_decoders.end ()) {
  78
  79                 /* Run video decoder; this may also produce audio */
  80
  81                 if ((*_video_decoder)->pass ()) {
  82                         _video_decoder++;
  83                 }
  84
  85                 if (_video_decoder != _video_decoders.end ()) {
  86                         done = false;
  87                 }
  88
  89         } else if (!_video && _playlist->audio_from() == Playlist::AUDIO_FFMPEG && _sequential_audio_decoder != _audio_decoders.end ()) {
  90
  91                 /* We're not producing video, so we may need to run FFmpeg content to get the audio */
  92
  93                 if ((*_sequential_audio_decoder)->pass ()) {
  94                         _sequential_audio_decoder++;
  95                 }
  96
  97                 if (_sequential_audio_decoder != _audio_decoders.end ()) {
  98                         done = false;
  99                 }
 100
 101         } else if (_playlist->audio_from() == Playlist::AUDIO_SNDFILE) {
 102
 103                 /* We're getting audio from SndfileContent */
 104
 105                 for (list<shared_ptr<AudioDecoder> >::iterator i = _audio_decoders.begin(); i != _audio_decoders.end(); ++i) {
 106                         if (!(*i)->pass ()) {
 107                                 done = false;
 108                         }
 109                 }
 110
 111                 Audio (_audio_buffers, _audio_time.get());
 112                 _audio_buffers.reset ();
 113                 _audio_time = boost::none;
 114         }
 115
 116         return done;
 117 }
 118
 119 void
 120 Player::set_progress (shared_ptr<Job> job)
 121 {
 122         /* Assume progress can be divined from how far through the video we are */
 123
 124         if (_video_decoder == _video_decoders.end() || !_playlist->video_length()) {
 125                 return;
 126         }
 127
 128         ContentVideoFrame p = 0;
 129         list<shared_ptr<VideoDecoder> >::iterator i = _video_decoders.begin ();
 130         while (i != _video_decoders.end() && i != _video_decoder) {
 131                 p += (*i)->video_length ();
 132         }
 133
 134         job->set_progress (float ((*_video_decoder)->video_frame ()) / _playlist->video_length ());
 135 }
 136
 137 void
 138 Player::process_video (shared_ptr<Image> i, bool same, shared_ptr<Subtitle> s, double t)
 139 {
 140         /* XXX: this time will need mangling to add on the offset of the start of the content */
 141         Video (i, same, s, t);
 142 }
 143
 144 void
 145 Player::process_audio (weak_ptr<const AudioContent> c, shared_ptr<AudioBuffers> b, double t)
 146 {
 147         /* XXX: this time will need mangling to add on the offset of the start of the content */
 148         AudioMapping mapping = _film->audio_mapping ();
 149         if (!_audio_buffers) {
 150                 _audio_buffers.reset (new AudioBuffers (mapping.dcp_channels(), b->frames ()));
 151                 _audio_buffers->make_silent ();
 152                 _audio_time = t;
 153         }
 154
 155         for (int i = 0; i < b->channels(); ++i) {
 156                 list<libdcp::Channel> dcp = mapping.content_to_dcp (AudioMapping::Channel (c, i));
 157                 for (list<libdcp::Channel>::iterator j = dcp.begin(); j != dcp.end(); ++j) {
 158                         _audio_buffers->accumulate (b, i, static_cast<int> (*j));
 159                 }
 160         }
 161
 162         if (_playlist->audio_from() == Playlist::AUDIO_FFMPEG) {
 163                 /* We can just emit this audio now as it will all be here */
 164                 Audio (_audio_buffers, t);
 165                 _audio_buffers.reset ();
 166                 _audio_time = boost::none;
 167         }
 168 }
 169
 170 /** @return true on error */
 171 bool
 172 Player::seek (double t)
 173 {
 174         if (!_have_valid_decoders) {
 175                 setup_decoders ();
 176                 _have_valid_decoders = true;
 177         }
 178
 179         /* Find the decoder that contains this position */
 180         _video_decoder = _video_decoders.begin ();
 181         while (_video_decoder != _video_decoders.end ()) {
 182                 double const this_length = double ((*_video_decoder)->video_length()) / _film->video_frame_rate ();
 183                 if (t < this_length) {
 184                         break;
 185                 }
 186                 t -= this_length;
 187                 ++_video_decoder;
 188         }
 189
 190         if (_video_decoder != _video_decoders.end()) {
 191                 (*_video_decoder)->seek (t);
 192         } else {
 193                 return true;
 194         }
 195
 196         /* XXX: don't seek audio because we don't need to... */
 197
 198         return false;
 199 }
 200
 201
 202 void
 203 Player::seek_back ()
 204 {
 205         /* XXX */
 206 }
 207
 208 void
 209 Player::seek_forward ()
 210 {
 211         /* XXX */
 212 }
 213
 214
 215 void
 216 Player::setup_decoders ()
 217 {
 218         _video_decoders.clear ();
 219         _video_decoder = _video_decoders.end ();
 220         _audio_decoders.clear ();
 221
 222         if (_video) {
 223                 list<shared_ptr<const VideoContent> > vc = _playlist->video ();
 224                 for (list<shared_ptr<const VideoContent> >::iterator i = vc.begin(); i != vc.end(); ++i) {
 225
 226                         shared_ptr<VideoDecoder> d;
 227
 228                         /* XXX: into content? */
 229
 230                         shared_ptr<const FFmpegContent> fc = dynamic_pointer_cast<const FFmpegContent> (*i);
 231                         if (fc) {
 232                                 shared_ptr<FFmpegDecoder> fd (
 233                                         new FFmpegDecoder (
 234                                                 _film, fc, _video,
 235                                                 _audio && _playlist->audio_from() == Playlist::AUDIO_FFMPEG,
 236                                                 _subtitles
 237                                                 )
 238                                         );
 239
 240                                 if (_playlist->audio_from() == Playlist::AUDIO_FFMPEG) {
 241                                         fd->Audio.connect (bind (&Player::process_audio, this, fc, _1, _2));
 242                                 }
 243
 244                                 d = fd;
 245                         }
 246
 247                         shared_ptr<const ImageMagickContent> ic = dynamic_pointer_cast<const ImageMagickContent> (*i);
 248                         if (ic) {
 249                                 d.reset (new ImageMagickDecoder (_film, ic));
 250                         }
 251
 252                         d->connect_video (shared_from_this ());
 253                         _video_decoders.push_back (d);
 254                 }
 255
 256                 _video_decoder = _video_decoders.begin ();
 257         }
 258
 259         if (_playlist->audio_from() == Playlist::AUDIO_FFMPEG && !_video) {
 260
 261                 /* If we're getting audio from FFmpegContent but not the video, we need a set
 262                    of decoders for the audio.
 263                 */
 264
 265                 list<shared_ptr<const AudioContent> > ac = _playlist->audio ();
 266                 for (list<shared_ptr<const AudioContent> >::iterator i = ac.begin(); i != ac.end(); ++i) {
 267
 268                         shared_ptr<const FFmpegContent> fc = dynamic_pointer_cast<const FFmpegContent> (*i);
 269                         assert (fc);
 270
 271                         shared_ptr<AudioDecoder> d (
 272                                 new FFmpegDecoder (
 273                                         _film, fc, _video,
 274                                         _audio && _playlist->audio_from() == Playlist::AUDIO_FFMPEG,
 275                                         _subtitles
 276                                         )
 277                                 );
 278
 279                         d->Audio.connect (bind (&Player::process_audio, this, fc, _1, _2));
 280                         _audio_decoders.push_back (d);
 281                 }
 282
 283                 _sequential_audio_decoder = _audio_decoders.begin ();
 284         }
 285
 286         if (_playlist->audio_from() == Playlist::AUDIO_SNDFILE) {
 287
 288                 list<shared_ptr<const AudioContent> > ac = _playlist->audio ();
 289                 for (list<shared_ptr<const AudioContent> >::iterator i = ac.begin(); i != ac.end(); ++i) {
 290
 291                         shared_ptr<const SndfileContent> sc = dynamic_pointer_cast<const SndfileContent> (*i);
 292                         assert (sc);
 293
 294                         shared_ptr<AudioDecoder> d (new SndfileDecoder (_film, sc));
 295                         d->Audio.connect (bind (&Player::process_audio, this, sc, _1, _2));
 296                         _audio_decoders.push_back (d);
 297                 }
 298         }
 299 }
 300
 301 double
 302 Player::last_video_time () const
 303 {
 304         double t = 0;
 305         for (list<shared_ptr<VideoDecoder> >::const_iterator i = _video_decoders.begin(); i != _video_decoder; ++i) {
 306                 t += (*i)->video_length() / (*i)->video_frame_rate ();
 307         }
 308
 309         return t + (*_video_decoder)->last_content_time ();
 310 }
 311
 312 void
 313 Player::content_changed (weak_ptr<Content> w, int p)
 314 {
 315         shared_ptr<Content> c = w.lock ();
 316         if (!c) {
 317                 return;
 318         }
 319
 320         if (p == VideoContentProperty::VIDEO_LENGTH) {
 321                 if (dynamic_pointer_cast<FFmpegContent> (c)) {
 322                         /* FFmpeg content length changes are serious; we need new decoders */
 323                         _have_valid_decoders = false;
 324                 }
 325         }
 326 }
 327
 328 void
 329 Player::playlist_changed ()
 330 {
 331         _have_valid_decoders = false;
 332 }