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 std::vector;
  34 using boost::shared_ptr;
  35 using boost::weak_ptr;
  36 using boost::dynamic_pointer_cast;
  37
  38 Player::Player (shared_ptr<const Film> f, shared_ptr<const Playlist> p)
  39         : _film (f)
  40         , _playlist (p)
  41         , _video (true)
  42         , _audio (true)
  43         , _subtitles (true)
  44         , _have_valid_decoders (false)
  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.size ()) {
  79
  80                 /* Run video decoder; this may also produce audio */
  81
  82                 if (_video_decoders[_video_decoder]->pass ()) {
  83                         _video_decoder++;
  84                 }
  85
  86                 if (_video_decoder < _video_decoders.size ()) {
  87                         done = false;
  88                 }
  89
  90         } else if (!_video && _playlist->audio_from() == Playlist::AUDIO_FFMPEG && _sequential_audio_decoder < _audio_decoders.size ()) {
  91
  92                 /* We're not producing video, so we may need to run FFmpeg content to get the audio */
  93
  94                 if (_audio_decoders[_sequential_audio_decoder]->pass ()) {
  95                         _sequential_audio_decoder++;
  96                 }
  97
  98                 if (_sequential_audio_decoder < _audio_decoders.size ()) {
  99                         done = false;
 100                 }
 101
 102         } else if (_playlist->audio_from() == Playlist::AUDIO_SNDFILE) {
 103
 104                 /* We're getting audio from SndfileContent */
 105
 106                 for (vector<shared_ptr<AudioDecoder> >::iterator i = _audio_decoders.begin(); i != _audio_decoders.end(); ++i) {
 107                         if (!(*i)->pass ()) {
 108                                 done = false;
 109                         }
 110                 }
 111
 112                 Audio (_audio_buffers, _audio_time.get());
 113                 _audio_buffers.reset ();
 114                 _audio_time = boost::none;
 115         }
 116
 117         return done;
 118 }
 119
 120 void
 121 Player::set_progress (shared_ptr<Job> job)
 122 {
 123         /* Assume progress can be divined from how far through the video we are */
 124
 125         if (_video_decoder >= _video_decoders.size() || !_playlist->video_length()) {
 126                 return;
 127         }
 128
 129         job->set_progress ((_video_start[_video_decoder] + _video_decoders[_video_decoder]->video_frame()) / _playlist->video_length ());
 130 }
 131
 132 void
 133 Player::process_video (shared_ptr<Image> i, bool same, shared_ptr<Subtitle> s, double t)
 134 {
 135         Video (i, same, s, _video_start[_video_decoder] + t);
 136 }
 137
 138 void
 139 Player::process_audio (weak_ptr<const AudioContent> c, shared_ptr<AudioBuffers> b, double t)
 140 {
 141         AudioMapping mapping = _film->audio_mapping ();
 142         if (!_audio_buffers) {
 143                 _audio_buffers.reset (new AudioBuffers (mapping.dcp_channels(), b->frames ()));
 144                 _audio_buffers->make_silent ();
 145                 _audio_time = t;
 146                 if (_playlist->audio_from() == Playlist::AUDIO_FFMPEG) {
 147                         _audio_time = _audio_time.get() + _audio_start[_sequential_audio_decoder];
 148                 }
 149         }
 150
 151         for (int i = 0; i < b->channels(); ++i) {
 152                 list<libdcp::Channel> dcp = mapping.content_to_dcp (AudioMapping::Channel (c, i));
 153                 for (list<libdcp::Channel>::iterator j = dcp.begin(); j != dcp.end(); ++j) {
 154                         _audio_buffers->accumulate (b, i, static_cast<int> (*j));
 155                 }
 156         }
 157
 158         if (_playlist->audio_from() == Playlist::AUDIO_FFMPEG) {
 159                 /* We can just emit this audio now as it will all be here */
 160                 Audio (_audio_buffers, t);
 161                 _audio_buffers.reset ();
 162                 _audio_time = boost::none;
 163         }
 164 }
 165
 166 /** @return true on error */
 167 bool
 168 Player::seek (double t)
 169 {
 170         if (!_have_valid_decoders) {
 171                 setup_decoders ();
 172                 _have_valid_decoders = true;
 173         }
 174
 175         /* Find the decoder that contains this position */
 176         _video_decoder = 0;
 177         while (1) {
 178                 ++_video_decoder;
 179                 if (_video_decoder >= _video_decoders.size () || t < _video_start[_video_decoder]) {
 180                         --_video_decoder;
 181                         t -= _video_start[_video_decoder];
 182                         break;
 183                 }
 184         }
 185
 186         if (_video_decoder < _video_decoders.size()) {
 187                 _video_decoders[_video_decoder]->seek (t);
 188         } else {
 189                 return true;
 190         }
 191
 192         /* XXX: don't seek audio because we don't need to... */
 193
 194         return false;
 195 }
 196
 197
 198 void
 199 Player::seek_back ()
 200 {
 201         /* XXX */
 202 }
 203
 204 void
 205 Player::seek_forward ()
 206 {
 207         /* XXX */
 208 }
 209
 210
 211 void
 212 Player::setup_decoders ()
 213 {
 214         _video_decoders.clear ();
 215         _video_decoder = 0;
 216         _audio_decoders.clear ();
 217         _sequential_audio_decoder = 0;
 218
 219         _video_start.clear();
 220         _audio_start.clear();
 221
 222         double video_so_far = 0;
 223         double audio_so_far = 0;
 224
 225         list<shared_ptr<const VideoContent> > vc = _playlist->video ();
 226         for (list<shared_ptr<const VideoContent> >::iterator i = vc.begin(); i != vc.end(); ++i) {
 227
 228                 shared_ptr<const VideoContent> video_content;
 229                 shared_ptr<const AudioContent> audio_content;
 230                 shared_ptr<VideoDecoder> video_decoder;
 231                 shared_ptr<AudioDecoder> audio_decoder;
 232
 233                 /* XXX: into content? */
 234
 235                 shared_ptr<const FFmpegContent> fc = dynamic_pointer_cast<const FFmpegContent> (*i);
 236                 if (fc) {
 237                         shared_ptr<FFmpegDecoder> fd (
 238                                 new FFmpegDecoder (
 239                                         _film, fc, _video,
 240                                         _audio && _playlist->audio_from() == Playlist::AUDIO_FFMPEG,
 241                                         _subtitles
 242                                         )
 243                                 );
 244
 245                         video_content = fc;
 246                         audio_content = fc;
 247                         video_decoder = fd;
 248                         audio_decoder = fd;
 249                 }
 250
 251                 shared_ptr<const ImageMagickContent> ic = dynamic_pointer_cast<const ImageMagickContent> (*i);
 252                 if (ic) {
 253                         video_content = ic;
 254                         video_decoder.reset (new ImageMagickDecoder (_film, ic));
 255                 }
 256
 257                 video_decoder->connect_video (shared_from_this ());
 258                 _video_decoders.push_back (video_decoder);
 259                 _video_start.push_back (video_so_far);
 260                 video_so_far += video_content->video_length() / video_content->video_frame_rate();
 261
 262                 if (audio_decoder && _playlist->audio_from() == Playlist::AUDIO_FFMPEG) {
 263                         audio_decoder->Audio.connect (bind (&Player::process_audio, this, audio_content, _1, _2));
 264                         _audio_decoders.push_back (audio_decoder);
 265                         _audio_start.push_back (audio_so_far);
 266                         audio_so_far += double(audio_content->audio_length()) / audio_content->audio_frame_rate();
 267                 }
 268         }
 269
 270         _video_decoder = 0;
 271         _sequential_audio_decoder = 0;
 272
 273         if (_playlist->audio_from() == Playlist::AUDIO_SNDFILE) {
 274
 275                 list<shared_ptr<const AudioContent> > ac = _playlist->audio ();
 276                 for (list<shared_ptr<const AudioContent> >::iterator i = ac.begin(); i != ac.end(); ++i) {
 277
 278                         shared_ptr<const SndfileContent> sc = dynamic_pointer_cast<const SndfileContent> (*i);
 279                         assert (sc);
 280
 281                         shared_ptr<AudioDecoder> d (new SndfileDecoder (_film, sc));
 282                         d->Audio.connect (bind (&Player::process_audio, this, sc, _1, _2));
 283                         _audio_decoders.push_back (d);
 284                         _audio_start.push_back (audio_so_far);
 285                 }
 286         }
 287 }
 288
 289 double
 290 Player::last_video_time () const
 291 {
 292         return _video_start[_video_decoder] + _video_decoders[_video_decoder]->last_content_time ();
 293 }
 294
 295 void
 296 Player::content_changed (weak_ptr<Content> w, int p)
 297 {
 298         shared_ptr<Content> c = w.lock ();
 299         if (!c) {
 300                 return;
 301         }
 302
 303         if (p == VideoContentProperty::VIDEO_LENGTH) {
 304                 if (dynamic_pointer_cast<FFmpegContent> (c)) {
 305                         /* FFmpeg content length changes are serious; we need new decoders */
 306                         _have_valid_decoders = false;
 307                 }
 308         }
 309 }
 310
 311 void
 312 Player::playlist_changed ()
 313 {
 314         _have_valid_decoders = false;
 315 }