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 #include "image.h"
  31 #include "null_content.h"
  32 #include "black_decoder.h"
  33 #include "silence_decoder.h"
  34
  35 using std::list;
  36 using std::cout;
  37 using std::min;
  38 using std::max;
  39 using std::vector;
  40 using boost::shared_ptr;
  41 using boost::weak_ptr;
  42 using boost::dynamic_pointer_cast;
  43
  44 struct Piece
  45 {
  46         Piece (shared_ptr<Content> c, shared_ptr<Decoder> d)
  47                 : content (c)
  48                 , decoder (d)
  49         {}
  50
  51         shared_ptr<Content> content;
  52         shared_ptr<Decoder> decoder;
  53 };
  54
  55 Player::Player (shared_ptr<const Film> f, shared_ptr<const Playlist> p)
  56         : _film (f)
  57         , _playlist (p)
  58         , _video (true)
  59         , _audio (true)
  60         , _subtitles (true)
  61         , _have_valid_pieces (false)
  62         , _position (0)
  63         , _audio_buffers (f->dcp_audio_channels(), 0)
  64         , _next_audio (0)
  65 {
  66         _playlist->Changed.connect (bind (&Player::playlist_changed, this));
  67         _playlist->ContentChanged.connect (bind (&Player::content_changed, this, _1, _2));
  68 }
  69
  70 void
  71 Player::disable_video ()
  72 {
  73         _video = false;
  74 }
  75
  76 void
  77 Player::disable_audio ()
  78 {
  79         _audio = false;
  80 }
  81
  82 void
  83 Player::disable_subtitles ()
  84 {
  85         _subtitles = false;
  86 }
  87
  88 bool
  89 Player::pass ()
  90 {
  91         if (!_have_valid_pieces) {
  92                 setup_pieces ();
  93                 _have_valid_pieces = true;
  94         }
  95
  96         /* Here we are just finding the active decoder with the earliest last emission time, then
  97            calling pass on it.
  98         */
  99
 100         Time earliest_t = TIME_MAX;
 101         shared_ptr<Piece> earliest;
 102
 103         for (list<shared_ptr<Piece> >::iterator i = _pieces.begin(); i != _pieces.end(); ++i) {
 104                 cout << "check " << (*i)->content->file()
 105                      << " start=" << (*i)->content->start()
 106                      << ", next=" << (*i)->decoder->next()
 107                      << ", end=" << (*i)->content->end() << "\n";
 108
 109                 if ((*i)->decoder->done ()) {
 110                         continue;
 111                 }
 112
 113                 if (!_audio && dynamic_pointer_cast<AudioDecoder> ((*i)->decoder) && !dynamic_pointer_cast<VideoDecoder> ((*i)->decoder)) {
 114                         continue;
 115                 }
 116
 117                 Time const t = (*i)->content->start() + (*i)->decoder->next();
 118                 if (t < earliest_t) {
 119                         cout << "\t candidate; " << t << " " << (t / TIME_HZ) << ".\n";
 120                         earliest_t = t;
 121                         earliest = *i;
 122                 }
 123         }
 124
 125         if (!earliest) {
 126                 flush ();
 127                 return true;
 128         }
 129
 130         cout << "PASS:\n";
 131         cout << "\tpass " << earliest->content->file() << " ";
 132         if (dynamic_pointer_cast<FFmpegContent> (earliest->content)) {
 133                 cout << " FFmpeg.\n";
 134         } else if (dynamic_pointer_cast<ImageMagickContent> (earliest->content)) {
 135                 cout << " ImageMagickContent.\n";
 136         } else if (dynamic_pointer_cast<SndfileContent> (earliest->content)) {
 137                 cout << " SndfileContent.\n";
 138         } else if (dynamic_pointer_cast<BlackDecoder> (earliest->decoder)) {
 139                 cout << " Black.\n";
 140         } else if (dynamic_pointer_cast<SilenceDecoder> (earliest->decoder)) {
 141                 cout << " Silence.\n";
 142         }
 143
 144         earliest->decoder->pass ();
 145         _position = earliest->content->start() + earliest->decoder->next ();
 146         cout << "\tpassed to " << _position << " " << (_position / TIME_HZ) << "\n";
 147
 148         return false;
 149 }
 150
 151 void
 152 Player::process_video (weak_ptr<Content> weak_content, shared_ptr<const Image> image, bool same, Time time)
 153 {
 154         shared_ptr<Content> content = weak_content.lock ();
 155         if (!content) {
 156                 return;
 157         }
 158
 159         time += content->start ();
 160
 161         Video (image, same, time);
 162 }
 163
 164 void
 165 Player::process_audio (weak_ptr<Content> weak_content, shared_ptr<const AudioBuffers> audio, Time time)
 166 {
 167         shared_ptr<Content> content = weak_content.lock ();
 168         if (!content) {
 169                 return;
 170         }
 171
 172         /* The time of this audio may indicate that some of our buffered audio is not going to
 173            be added to any more, so it can be emitted.
 174         */
 175
 176         time += content->start ();
 177
 178         if (time > _next_audio) {
 179                 /* We can emit some audio from our buffers */
 180                 OutputAudioFrame const N = _film->time_to_audio_frames (time - _next_audio);
 181                 assert (N <= _audio_buffers.frames());
 182                 shared_ptr<AudioBuffers> emit (new AudioBuffers (_audio_buffers.channels(), N));
 183                 emit->copy_from (&_audio_buffers, N, 0, 0);
 184                 Audio (emit, _next_audio);
 185                 _next_audio += _film->audio_frames_to_time (N);
 186
 187                 /* And remove it from our buffers */
 188                 if (_audio_buffers.frames() > N) {
 189                         _audio_buffers.move (N, 0, _audio_buffers.frames() - N);
 190                 }
 191                 _audio_buffers.set_frames (_audio_buffers.frames() - N);
 192         }
 193
 194         /* Now accumulate the new audio into our buffers */
 195         _audio_buffers.ensure_size (_audio_buffers.frames() + audio->frames());
 196         _audio_buffers.accumulate_frames (audio.get(), 0, 0, audio->frames ());
 197         _audio_buffers.set_frames (_audio_buffers.frames() + audio->frames());
 198 }
 199
 200 void
 201 Player::flush ()
 202 {
 203         if (_audio_buffers.frames() > 0) {
 204                 shared_ptr<AudioBuffers> emit (new AudioBuffers (_audio_buffers.channels(), _audio_buffers.frames()));
 205                 emit->copy_from (&_audio_buffers, _audio_buffers.frames(), 0, 0);
 206                 Audio (emit, _next_audio);
 207                 _next_audio += _film->audio_frames_to_time (_audio_buffers.frames ());
 208                 _audio_buffers.set_frames (0);
 209         }
 210 }
 211
 212 /** @return true on error */
 213 void
 214 Player::seek (Time t)
 215 {
 216         if (!_have_valid_pieces) {
 217                 setup_pieces ();
 218                 _have_valid_pieces = true;
 219         }
 220
 221         if (_pieces.empty ()) {
 222                 return;
 223         }
 224
 225 //      cout << "seek to " << t << " " << (t / TIME_HZ) << "\n";
 226
 227         for (list<shared_ptr<Piece> >::iterator i = _pieces.begin(); i != _pieces.end(); ++i) {
 228                 Time s = t - (*i)->content->start ();
 229                 s = max (static_cast<Time> (0), s);
 230                 s = min ((*i)->content->length(), s);
 231 //              cout << "seek [" << (*i)->content->file() << "," << (*i)->content->start() << "," << (*i)->content->end() << "] to " << s << "\n";
 232                 (*i)->decoder->seek (s);
 233         }
 234
 235         /* XXX: don't seek audio because we don't need to... */
 236 }
 237
 238
 239 void
 240 Player::seek_back ()
 241 {
 242
 243 }
 244
 245 void
 246 Player::seek_forward ()
 247 {
 248
 249 }
 250
 251 void
 252 Player::add_black_piece (Time s, Time len)
 253 {
 254         shared_ptr<NullContent> nc (new NullContent (_film, s, len));
 255         nc->set_ratio (_film->container ());
 256         shared_ptr<BlackDecoder> bd (new BlackDecoder (_film, nc));
 257         bd->Video.connect (bind (&Player::process_video, this, nc, _1, _2, _3));
 258         _pieces.push_back (shared_ptr<Piece> (new Piece (nc, bd)));
 259         cout << "\tblack @ " << s << " -- " << (s + len) << "\n";
 260 }
 261
 262 void
 263 Player::add_silent_piece (Time s, Time len)
 264 {
 265         shared_ptr<NullContent> nc (new NullContent (_film, s, len));
 266         shared_ptr<SilenceDecoder> sd (new SilenceDecoder (_film, nc));
 267         sd->Audio.connect (bind (&Player::process_audio, this, nc, _1, _2));
 268         _pieces.push_back (shared_ptr<Piece> (new Piece (nc, sd)));
 269         cout << "\tsilence @ " << s << " -- " << (s + len) << "\n";
 270 }
 271
 272
 273 void
 274 Player::setup_pieces ()
 275 {
 276         cout << "----- Player SETUP PIECES.\n";
 277
 278         list<shared_ptr<Piece> > old_pieces = _pieces;
 279
 280         _pieces.clear ();
 281
 282         Playlist::ContentList content = _playlist->content ();
 283         sort (content.begin(), content.end(), ContentSorter ());
 284
 285         for (Playlist::ContentList::iterator i = content.begin(); i != content.end(); ++i) {
 286
 287                 shared_ptr<Decoder> decoder;
 288
 289                 /* XXX: into content? */
 290
 291                 shared_ptr<const FFmpegContent> fc = dynamic_pointer_cast<const FFmpegContent> (*i);
 292                 if (fc) {
 293                         shared_ptr<FFmpegDecoder> fd (new FFmpegDecoder (_film, fc, _video, _audio, _subtitles));
 294
 295                         fd->Video.connect (bind (&Player::process_video, this, *i, _1, _2, _3));
 296                         fd->Audio.connect (bind (&Player::process_audio, this, *i, _1, _2));
 297
 298                         decoder = fd;
 299                         cout << "\tFFmpeg @ " << fc->start() << " -- " << fc->end() << "\n";
 300                 }
 301
 302                 shared_ptr<const ImageMagickContent> ic = dynamic_pointer_cast<const ImageMagickContent> (*i);
 303                 if (ic) {
 304                         shared_ptr<ImageMagickDecoder> id;
 305
 306                         /* See if we can re-use an old ImageMagickDecoder */
 307                         for (list<shared_ptr<Piece> >::const_iterator j = old_pieces.begin(); j != old_pieces.end(); ++j) {
 308                                 shared_ptr<ImageMagickDecoder> imd = dynamic_pointer_cast<ImageMagickDecoder> ((*j)->decoder);
 309                                 if (imd && imd->content() == ic) {
 310                                         id = imd;
 311                                 }
 312                         }
 313
 314                         if (!id) {
 315                                 id.reset (new ImageMagickDecoder (_film, ic));
 316                                 id->Video.connect (bind (&Player::process_video, this, *i, _1, _2, _3));
 317                         }
 318
 319                         decoder = id;
 320                         cout << "\tImageMagick @ " << ic->start() << " -- " << ic->end() << "\n";
 321                 }
 322
 323                 shared_ptr<const SndfileContent> sc = dynamic_pointer_cast<const SndfileContent> (*i);
 324                 if (sc) {
 325                         shared_ptr<AudioDecoder> sd (new SndfileDecoder (_film, sc));
 326                         sd->Audio.connect (bind (&Player::process_audio, this, *i, _1, _2));
 327
 328                         decoder = sd;
 329                         cout << "\tSndfile @ " << sc->start() << " -- " << sc->end() << "\n";
 330                 }
 331
 332                 _pieces.push_back (shared_ptr<Piece> (new Piece (*i, decoder)));
 333         }
 334
 335         /* Fill in visual gaps with black and audio gaps with silence */
 336
 337         Time video_pos = 0;
 338         Time audio_pos = 0;
 339         list<shared_ptr<Piece> > pieces_copy = _pieces;
 340         for (list<shared_ptr<Piece> >::iterator i = pieces_copy.begin(); i != pieces_copy.end(); ++i) {
 341                 if (dynamic_pointer_cast<VideoContent> ((*i)->content)) {
 342                         Time const diff = (*i)->content->start() - video_pos;
 343                         if (diff > 0) {
 344                                 add_black_piece (video_pos, diff);
 345                         }
 346                         video_pos = (*i)->content->end();
 347                 }
 348
 349                 shared_ptr<AudioContent> ac = dynamic_pointer_cast<AudioContent> ((*i)->content);
 350                 if (ac && ac->audio_channels()) {
 351                         Time const diff = (*i)->content->start() - audio_pos;
 352                         if (diff > 0) {
 353                                 add_silent_piece (video_pos, diff);
 354                         }
 355                         audio_pos = (*i)->content->end();
 356                 }
 357         }
 358
 359         if (video_pos < audio_pos) {
 360                 add_black_piece (video_pos, audio_pos - video_pos);
 361         } else if (audio_pos < video_pos) {
 362                 add_silent_piece (audio_pos, video_pos - audio_pos);
 363         }
 364 }
 365
 366 void
 367 Player::content_changed (weak_ptr<Content> w, int p)
 368 {
 369         shared_ptr<Content> c = w.lock ();
 370         if (!c) {
 371                 return;
 372         }
 373
 374         if (p == ContentProperty::START || p == ContentProperty::LENGTH) {
 375                 _have_valid_pieces = false;
 376         }
 377 }
 378
 379 void
 380 Player::playlist_changed ()
 381 {
 382         _have_valid_pieces = false;
 383 }