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 && _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         }
  91
  92         if (!_video && _audio && _playlist->audio_from() == Playlist::AUDIO_FFMPEG && _sequential_audio_decoder < _audio_decoders.size ()) {
  93
  94                 /* We're not producing video, so we may need to run FFmpeg content to get the audio */
  95
  96                 if (_audio_decoders[_sequential_audio_decoder]->pass ()) {
  97                         _sequential_audio_decoder++;
  98                 }
  99
 100                 if (_sequential_audio_decoder < _audio_decoders.size ()) {
 101                         done = false;
 102                 }
 103
 104         }
 105
 106         if (_audio && _playlist->audio_from() == Playlist::AUDIO_SNDFILE) {
 107
 108                 /* We're getting audio from SndfileContent */
 109
 110                 for (vector<shared_ptr<AudioDecoder> >::iterator i = _audio_decoders.begin(); i != _audio_decoders.end(); ++i) {
 111                         if (!(*i)->pass ()) {
 112                                 done = false;
 113                         }
 114                 }
 115
 116                 Audio (_audio_buffers, _audio_time.get());
 117                 _audio_buffers.reset ();
 118                 _audio_time = boost::none;
 119         }
 120
 121         return done;
 122 }
 123
 124 void
 125 Player::set_progress (shared_ptr<Job> job)
 126 {
 127         /* Assume progress can be divined from how far through the video we are */
 128
 129         if (_video_decoder >= _video_decoders.size() || !_playlist->video_length()) {
 130                 return;
 131         }
 132
 133         job->set_progress ((_video_start[_video_decoder] + _video_decoders[_video_decoder]->video_frame()) / _playlist->video_length ());
 134 }
 135
 136 void
 137 Player::process_video (shared_ptr<const Image> i, bool same, shared_ptr<Subtitle> s, double t)
 138 {
 139         Video (i, same, s, _video_start[_video_decoder] + t);
 140 }
 141
 142 void
 143 Player::process_audio (weak_ptr<const AudioContent> c, shared_ptr<const AudioBuffers> b, double t)
 144 {
 145         AudioMapping mapping = _film->audio_mapping ();
 146         if (!_audio_buffers) {
 147                 _audio_buffers.reset (new AudioBuffers (mapping.dcp_channels(), b->frames ()));
 148                 _audio_buffers->make_silent ();
 149                 _audio_time = t;
 150                 if (_playlist->audio_from() == Playlist::AUDIO_FFMPEG) {
 151                         _audio_time = _audio_time.get() + _audio_start[_sequential_audio_decoder];
 152                 }
 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         if (_video_decoders.empty ()) {
 180                 return true;
 181         }
 182
 183         /* Find the decoder that contains this position */
 184         _video_decoder = 0;
 185         while (1) {
 186                 ++_video_decoder;
 187                 if (_video_decoder >= _video_decoders.size () || t < _video_start[_video_decoder]) {
 188                         --_video_decoder;
 189                         t -= _video_start[_video_decoder];
 190                         break;
 191                 }
 192         }
 193
 194         if (_video_decoder < _video_decoders.size()) {
 195                 _video_decoders[_video_decoder]->seek (t);
 196         } else {
 197                 return true;
 198         }
 199
 200         /* XXX: don't seek audio because we don't need to... */
 201
 202         return false;
 203 }
 204
 205
 206 void
 207 Player::seek_back ()
 208 {
 209         /* XXX */
 210 }
 211
 212 void
 213 Player::seek_forward ()
 214 {
 215         /* XXX */
 216 }
 217
 218
 219 void
 220 Player::setup_decoders ()
 221 {
 222         _video_decoders.clear ();
 223         _video_decoder = 0;
 224         _audio_decoders.clear ();
 225         _sequential_audio_decoder = 0;
 226
 227         _video_start.clear();
 228         _audio_start.clear();
 229
 230         double video_so_far = 0;
 231         double audio_so_far = 0;
 232
 233         list<shared_ptr<const VideoContent> > vc = _playlist->video ();
 234         for (list<shared_ptr<const VideoContent> >::iterator i = vc.begin(); i != vc.end(); ++i) {
 235
 236                 shared_ptr<const VideoContent> video_content;
 237                 shared_ptr<const AudioContent> audio_content;
 238                 shared_ptr<VideoDecoder> video_decoder;
 239                 shared_ptr<AudioDecoder> audio_decoder;
 240
 241                 /* XXX: into content? */
 242
 243                 shared_ptr<const FFmpegContent> fc = dynamic_pointer_cast<const FFmpegContent> (*i);
 244                 if (fc) {
 245                         shared_ptr<FFmpegDecoder> fd (
 246                                 new FFmpegDecoder (
 247                                         _film, fc, _video,
 248                                         _audio && _playlist->audio_from() == Playlist::AUDIO_FFMPEG,
 249                                         _subtitles
 250                                         )
 251                                 );
 252
 253                         video_content = fc;
 254                         audio_content = fc;
 255                         video_decoder = fd;
 256                         audio_decoder = fd;
 257                 }
 258
 259                 shared_ptr<const ImageMagickContent> ic = dynamic_pointer_cast<const ImageMagickContent> (*i);
 260                 if (ic) {
 261                         video_content = ic;
 262                         video_decoder.reset (new ImageMagickDecoder (_film, ic));
 263                 }
 264
 265                 video_decoder->connect_video (shared_from_this ());
 266                 _video_decoders.push_back (video_decoder);
 267                 _video_start.push_back (video_so_far);
 268                 video_so_far += video_content->video_length() / video_content->video_frame_rate();
 269
 270                 if (audio_decoder && _playlist->audio_from() == Playlist::AUDIO_FFMPEG) {
 271                         audio_decoder->Audio.connect (bind (&Player::process_audio, this, audio_content, _1, _2));
 272                         _audio_decoders.push_back (audio_decoder);
 273                         _audio_start.push_back (audio_so_far);
 274                         audio_so_far += double(audio_content->audio_length()) / audio_content->audio_frame_rate();
 275                 }
 276         }
 277
 278         _video_decoder = 0;
 279         _sequential_audio_decoder = 0;
 280
 281         if (_playlist->audio_from() == Playlist::AUDIO_SNDFILE) {
 282
 283                 list<shared_ptr<const AudioContent> > ac = _playlist->audio ();
 284                 for (list<shared_ptr<const AudioContent> >::iterator i = ac.begin(); i != ac.end(); ++i) {
 285
 286                         shared_ptr<const SndfileContent> sc = dynamic_pointer_cast<const SndfileContent> (*i);
 287                         assert (sc);
 288
 289                         shared_ptr<AudioDecoder> d (new SndfileDecoder (_film, sc));
 290                         d->Audio.connect (bind (&Player::process_audio, this, sc, _1, _2));
 291                         _audio_decoders.push_back (d);
 292                         _audio_start.push_back (audio_so_far);
 293                 }
 294         }
 295 }
 296
 297 double
 298 Player::last_video_time () const
 299 {
 300         return _video_start[_video_decoder] + _video_decoders[_video_decoder]->last_content_time ();
 301 }
 302
 303 void
 304 Player::content_changed (weak_ptr<Content> w, int p)
 305 {
 306         shared_ptr<Content> c = w.lock ();
 307         if (!c) {
 308                 return;
 309         }
 310
 311         if (p == VideoContentProperty::VIDEO_LENGTH) {
 312                 if (dynamic_pointer_cast<FFmpegContent> (c)) {
 313                         /* FFmpeg content length changes are serious; we need new decoders */
 314                         _have_valid_decoders = false;
 315                 }
 316         }
 317 }
 318
 319 void
 320 Player::playlist_changed ()
 321 {
 322         _have_valid_decoders = false;
 323 }