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