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 <stdint.h>
  21 #include "player.h"
  22 #include "film.h"
  23 #include "ffmpeg_decoder.h"
  24 #include "ffmpeg_content.h"
  25 #include "imagemagick_decoder.h"
  26 #include "imagemagick_content.h"
  27 #include "sndfile_decoder.h"
  28 #include "sndfile_content.h"
  29 #include "playlist.h"
  30 #include "job.h"
  31 #include "image.h"
  32 #include "null_content.h"
  33 #include "black_decoder.h"
  34 #include "silence_decoder.h"
  35
  36 using std::list;
  37 using std::cout;
  38 using std::min;
  39 using std::max;
  40 using std::vector;
  41 using boost::shared_ptr;
  42 using boost::weak_ptr;
  43 using boost::dynamic_pointer_cast;
  44
  45 struct Piece
  46 {
  47         Piece (shared_ptr<Content> c, shared_ptr<Decoder> d)
  48                 : content (c)
  49                 , decoder (d)
  50         {}
  51
  52         shared_ptr<Content> content;
  53         shared_ptr<Decoder> decoder;
  54 };
  55
  56 Player::Player (shared_ptr<const Film> f, shared_ptr<const Playlist> p)
  57         : _film (f)
  58         , _playlist (p)
  59         , _video (true)
  60         , _audio (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 bool
  83 Player::pass ()
  84 {
  85         if (!_have_valid_pieces) {
  86                 setup_pieces ();
  87                 _have_valid_pieces = true;
  88         }
  89
  90         /* Here we are just finding the active decoder with the earliest last emission time, then
  91            calling pass on it.
  92         */
  93
  94         Time earliest_t = TIME_MAX;
  95         shared_ptr<Piece> earliest;
  96
  97         for (list<shared_ptr<Piece> >::iterator i = _pieces.begin(); i != _pieces.end(); ++i) {
  98                 cout << "check " << (*i)->content->file()
  99                      << " start=" << (*i)->content->start()
 100                      << ", next=" << (*i)->decoder->next()
 101                      << ", end=" << (*i)->content->end() << "\n";
 102
 103                 if ((*i)->decoder->done ()) {
 104                         continue;
 105                 }
 106
 107                 if (!_audio && dynamic_pointer_cast<AudioDecoder> ((*i)->decoder) && !dynamic_pointer_cast<VideoDecoder> ((*i)->decoder)) {
 108                         continue;
 109                 }
 110
 111                 Time const t = (*i)->content->start() + (*i)->decoder->next();
 112                 if (t < earliest_t) {
 113                         cout << "\t candidate; " << t << " " << (t / TIME_HZ) << ".\n";
 114                         earliest_t = t;
 115                         earliest = *i;
 116                 }
 117         }
 118
 119         if (!earliest) {
 120                 flush ();
 121                 return true;
 122         }
 123
 124         cout << "PASS:\n";
 125         cout << "\tpass " << earliest->content->file() << " ";
 126         if (dynamic_pointer_cast<FFmpegContent> (earliest->content)) {
 127                 cout << " FFmpeg.\n";
 128         } else if (dynamic_pointer_cast<ImageMagickContent> (earliest->content)) {
 129                 cout << " ImageMagickContent.\n";
 130         } else if (dynamic_pointer_cast<SndfileContent> (earliest->content)) {
 131                 cout << " SndfileContent.\n";
 132         } else if (dynamic_pointer_cast<BlackDecoder> (earliest->decoder)) {
 133                 cout << " Black.\n";
 134         } else if (dynamic_pointer_cast<SilenceDecoder> (earliest->decoder)) {
 135                 cout << " Silence.\n";
 136         }
 137
 138         earliest->decoder->pass ();
 139         _position = earliest->content->start() + earliest->decoder->next ();
 140         cout << "\tpassed to " << _position << " " << (_position / TIME_HZ) << "\n";
 141
 142         return false;
 143 }
 144
 145 void
 146 Player::process_video (weak_ptr<Content> weak_content, shared_ptr<const Image> image, bool same, Time time)
 147 {
 148         shared_ptr<Content> content = weak_content.lock ();
 149         if (!content) {
 150                 return;
 151         }
 152
 153         time += content->start ();
 154
 155         Video (image, same, time);
 156 }
 157
 158 void
 159 Player::process_audio (weak_ptr<Content> weak_content, shared_ptr<const AudioBuffers> audio, Time time)
 160 {
 161         shared_ptr<Content> content = weak_content.lock ();
 162         if (!content) {
 163                 return;
 164         }
 165
 166         /* The time of this audio may indicate that some of our buffered audio is not going to
 167            be added to any more, so it can be emitted.
 168         */
 169
 170         time += content->start ();
 171
 172         if (time > _next_audio) {
 173                 /* We can emit some audio from our buffers */
 174                 OutputAudioFrame const N = _film->time_to_audio_frames (time - _next_audio);
 175                 assert (N <= _audio_buffers.frames());
 176                 shared_ptr<AudioBuffers> emit (new AudioBuffers (_audio_buffers.channels(), N));
 177                 emit->copy_from (&_audio_buffers, N, 0, 0);
 178                 Audio (emit, _next_audio);
 179                 _next_audio += _film->audio_frames_to_time (N);
 180
 181                 /* And remove it from our buffers */
 182                 if (_audio_buffers.frames() > N) {
 183                         _audio_buffers.move (N, 0, _audio_buffers.frames() - N);
 184                 }
 185                 _audio_buffers.set_frames (_audio_buffers.frames() - N);
 186         }
 187
 188         /* Now accumulate the new audio into our buffers */
 189         _audio_buffers.ensure_size (_audio_buffers.frames() + audio->frames());
 190         _audio_buffers.accumulate_frames (audio.get(), 0, 0, audio->frames ());
 191         _audio_buffers.set_frames (_audio_buffers.frames() + audio->frames());
 192 }
 193
 194 void
 195 Player::flush ()
 196 {
 197         if (_audio_buffers.frames() > 0) {
 198                 shared_ptr<AudioBuffers> emit (new AudioBuffers (_audio_buffers.channels(), _audio_buffers.frames()));
 199                 emit->copy_from (&_audio_buffers, _audio_buffers.frames(), 0, 0);
 200                 Audio (emit, _next_audio);
 201                 _next_audio += _film->audio_frames_to_time (_audio_buffers.frames ());
 202                 _audio_buffers.set_frames (0);
 203         }
 204 }
 205
 206 /** @return true on error */
 207 void
 208 Player::seek (Time t)
 209 {
 210         if (!_have_valid_pieces) {
 211                 setup_pieces ();
 212                 _have_valid_pieces = true;
 213         }
 214
 215         if (_pieces.empty ()) {
 216                 return;
 217         }
 218
 219 //      cout << "seek to " << t << " " << (t / TIME_HZ) << "\n";
 220
 221         for (list<shared_ptr<Piece> >::iterator i = _pieces.begin(); i != _pieces.end(); ++i) {
 222                 Time s = t - (*i)->content->start ();
 223                 s = max (static_cast<Time> (0), s);
 224                 s = min ((*i)->content->length(), s);
 225 //              cout << "seek [" << (*i)->content->file() << "," << (*i)->content->start() << "," << (*i)->content->end() << "] to " << s << "\n";
 226                 (*i)->decoder->seek (s);
 227         }
 228
 229         /* XXX: don't seek audio because we don't need to... */
 230 }
 231
 232
 233 void
 234 Player::seek_back ()
 235 {
 236
 237 }
 238
 239 void
 240 Player::seek_forward ()
 241 {
 242
 243 }
 244
 245 void
 246 Player::add_black_piece (Time s, Time len)
 247 {
 248         shared_ptr<NullContent> nc (new NullContent (_film, s, len));
 249         nc->set_ratio (_film->container ());
 250         shared_ptr<BlackDecoder> bd (new BlackDecoder (_film, nc));
 251         bd->Video.connect (bind (&Player::process_video, this, nc, _1, _2, _3));
 252         _pieces.push_back (shared_ptr<Piece> (new Piece (nc, bd)));
 253         cout << "\tblack @ " << s << " -- " << (s + len) << "\n";
 254 }
 255
 256 void
 257 Player::add_silent_piece (Time s, Time len)
 258 {
 259         shared_ptr<NullContent> nc (new NullContent (_film, s, len));
 260         shared_ptr<SilenceDecoder> sd (new SilenceDecoder (_film, nc));
 261         sd->Audio.connect (bind (&Player::process_audio, this, nc, _1, _2));
 262         _pieces.push_back (shared_ptr<Piece> (new Piece (nc, sd)));
 263         cout << "\tsilence @ " << s << " -- " << (s + len) << "\n";
 264 }
 265
 266
 267 void
 268 Player::setup_pieces ()
 269 {
 270         cout << "----- Player SETUP PIECES.\n";
 271
 272         list<shared_ptr<Piece> > old_pieces = _pieces;
 273
 274         _pieces.clear ();
 275
 276         Playlist::ContentList content = _playlist->content ();
 277         sort (content.begin(), content.end(), ContentSorter ());
 278
 279         for (Playlist::ContentList::iterator i = content.begin(); i != content.end(); ++i) {
 280
 281                 shared_ptr<Decoder> decoder;
 282
 283                 /* XXX: into content? */
 284
 285                 shared_ptr<const FFmpegContent> fc = dynamic_pointer_cast<const FFmpegContent> (*i);
 286                 if (fc) {
 287                         shared_ptr<FFmpegDecoder> fd (new FFmpegDecoder (_film, fc, _video, _audio));
 288
 289                         fd->Video.connect (bind (&Player::process_video, this, *i, _1, _2, _3));
 290                         fd->Audio.connect (bind (&Player::process_audio, this, *i, _1, _2));
 291                         if (_video_container_size) {
 292                                 fd->set_video_container_size (_video_container_size.get ());
 293                         }
 294
 295                         decoder = fd;
 296                         cout << "\tFFmpeg @ " << fc->start() << " -- " << fc->end() << "\n";
 297                 }
 298
 299                 shared_ptr<const ImageMagickContent> ic = dynamic_pointer_cast<const ImageMagickContent> (*i);
 300                 if (ic) {
 301                         shared_ptr<ImageMagickDecoder> id;
 302
 303                         /* See if we can re-use an old ImageMagickDecoder */
 304                         for (list<shared_ptr<Piece> >::const_iterator j = old_pieces.begin(); j != old_pieces.end(); ++j) {
 305                                 shared_ptr<ImageMagickDecoder> imd = dynamic_pointer_cast<ImageMagickDecoder> ((*j)->decoder);
 306                                 if (imd && imd->content() == ic) {
 307                                         id = imd;
 308                                 }
 309                         }
 310
 311                         if (!id) {
 312                                 id.reset (new ImageMagickDecoder (_film, ic));
 313                                 id->Video.connect (bind (&Player::process_video, this, *i, _1, _2, _3));
 314                                 if (_video_container_size) {
 315                                         id->set_video_container_size (_video_container_size.get ());
 316                                 }
 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 }
 384
 385 void
 386 Player::set_video_container_size (libdcp::Size s)
 387 {
 388         _video_container_size = s;
 389         for (list<shared_ptr<Piece> >::iterator i = _pieces.begin(); i != _pieces.end(); ++i) {
 390                 shared_ptr<VideoDecoder> vd = dynamic_pointer_cast<VideoDecoder> ((*i)->decoder);
 391                 if (vd) {
 392                         vd->set_video_container_size (s);
 393                 }
 394         }
 395 }