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 #define DEBUG_PLAYER 1
  46
  47 struct Piece
  48 {
  49         Piece (shared_ptr<Content> c, shared_ptr<Decoder> d)
  50                 : content (c)
  51                 , decoder (d)
  52         {}
  53
  54         shared_ptr<Content> content;
  55         shared_ptr<Decoder> decoder;
  56 };
  57
  58
  59 #ifdef DEBUG_PLAYER
  60 std::ostream& operator<<(std::ostream& s, Piece const & p)
  61 {
  62         if (dynamic_pointer_cast<NullContent> (p.content)) {
  63                 if (dynamic_pointer_cast<SilenceDecoder> (p.decoder)) {
  64                         s << "\tsilence    ";
  65                 } else {
  66                         s << "\tblack      ";
  67                 }
  68         } else if (dynamic_pointer_cast<FFmpegContent> (p.content)) {
  69                 s << "\tffmpeg     ";
  70         } else if (dynamic_pointer_cast<ImageMagickContent> (p.content)) {
  71                 s << "\timagemagick";
  72         } else if (dynamic_pointer_cast<SndfileContent> (p.content)) {
  73                 s << "\tsndfile    ";
  74         }
  75
  76         s << " at " << p.content->start() << " until " << p.content->end();
  77
  78         return s;
  79 }
  80 #endif
  81
  82 Player::Player (shared_ptr<const Film> f, shared_ptr<const Playlist> p)
  83         : _film (f)
  84         , _playlist (p)
  85         , _video (true)
  86         , _audio (true)
  87         , _have_valid_pieces (false)
  88         , _position (0)
  89         , _audio_buffers (f->dcp_audio_channels(), 0)
  90         , _next_audio (0)
  91 {
  92         _playlist->Changed.connect (bind (&Player::playlist_changed, this));
  93         _playlist->ContentChanged.connect (bind (&Player::content_changed, this, _1, _2));
  94 }
  95
  96 void
  97 Player::disable_video ()
  98 {
  99         _video = false;
 100 }
 101
 102 void
 103 Player::disable_audio ()
 104 {
 105         _audio = false;
 106 }
 107
 108 bool
 109 Player::pass ()
 110 {
 111         if (!_have_valid_pieces) {
 112                 setup_pieces ();
 113                 _have_valid_pieces = true;
 114         }
 115
 116         /* Here we are just finding the active decoder with the earliest last emission time, then
 117            calling pass on it.
 118         */
 119
 120         Time earliest_t = TIME_MAX;
 121         shared_ptr<Piece> earliest;
 122
 123         for (list<shared_ptr<Piece> >::iterator i = _pieces.begin(); i != _pieces.end(); ++i) {
 124                 if ((*i)->decoder->done ()) {
 125                         continue;
 126                 }
 127
 128                 if (!_audio && dynamic_pointer_cast<AudioDecoder> ((*i)->decoder) && !dynamic_pointer_cast<VideoDecoder> ((*i)->decoder)) {
 129                         continue;
 130                 }
 131
 132                 Time const t = (*i)->content->start() + (*i)->decoder->position();
 133                 if (t < earliest_t) {
 134                         earliest_t = t;
 135                         earliest = *i;
 136                 }
 137         }
 138
 139         if (!earliest) {
 140                 flush ();
 141                 return true;
 142         }
 143
 144         earliest->decoder->pass ();
 145         _position = earliest->content->start() + earliest->decoder->position ();
 146
 147         return false;
 148 }
 149
 150 void
 151 Player::process_video (weak_ptr<Content> weak_content, shared_ptr<const Image> image, bool same, Time time)
 152 {
 153         shared_ptr<Content> content = weak_content.lock ();
 154         if (!content) {
 155                 return;
 156         }
 157
 158         time += content->start ();
 159
 160         Video (image, same, time);
 161 }
 162
 163 void
 164 Player::process_audio (weak_ptr<Content> weak_content, shared_ptr<const AudioBuffers> audio, Time time)
 165 {
 166         shared_ptr<Content> content = weak_content.lock ();
 167         if (!content) {
 168                 return;
 169         }
 170
 171         /* The time of this audio may indicate that some of our buffered audio is not going to
 172            be added to any more, so it can be emitted.
 173         */
 174
 175         time += content->start ();
 176
 177         cout << "Player gets " << audio->frames() << " @ " << time << " cf " << _next_audio << "\n";
 178
 179         if (time > _next_audio) {
 180                 /* We can emit some audio from our buffers */
 181                 OutputAudioFrame const N = _film->time_to_audio_frames (time - _next_audio);
 182                 assert (N <= _audio_buffers.frames());
 183                 shared_ptr<AudioBuffers> emit (new AudioBuffers (_audio_buffers.channels(), N));
 184                 emit->copy_from (&_audio_buffers, N, 0, 0);
 185                 Audio (emit, _next_audio);
 186                 _next_audio += _film->audio_frames_to_time (N);
 187
 188                 /* And remove it from our buffers */
 189                 if (_audio_buffers.frames() > N) {
 190                         _audio_buffers.move (N, 0, _audio_buffers.frames() - N);
 191                 }
 192                 _audio_buffers.set_frames (_audio_buffers.frames() - N);
 193         }
 194
 195         /* Now accumulate the new audio into our buffers */
 196         _audio_buffers.ensure_size (_audio_buffers.frames() + audio->frames());
 197         _audio_buffers.accumulate_frames (audio.get(), 0, 0, audio->frames ());
 198         _audio_buffers.set_frames (_audio_buffers.frames() + audio->frames());
 199 }
 200
 201 void
 202 Player::flush ()
 203 {
 204         if (_audio_buffers.frames() > 0) {
 205                 shared_ptr<AudioBuffers> emit (new AudioBuffers (_audio_buffers.channels(), _audio_buffers.frames()));
 206                 emit->copy_from (&_audio_buffers, _audio_buffers.frames(), 0, 0);
 207                 Audio (emit, _next_audio);
 208                 _next_audio += _film->audio_frames_to_time (_audio_buffers.frames ());
 209                 _audio_buffers.set_frames (0);
 210         }
 211 }
 212
 213 /** @return true on error */
 214 void
 215 Player::seek (Time t)
 216 {
 217         if (!_have_valid_pieces) {
 218                 setup_pieces ();
 219                 _have_valid_pieces = true;
 220         }
 221
 222         if (_pieces.empty ()) {
 223                 return;
 224         }
 225
 226         for (list<shared_ptr<Piece> >::iterator i = _pieces.begin(); i != _pieces.end(); ++i) {
 227                 Time s = t - (*i)->content->start ();
 228                 s = max (static_cast<Time> (0), s);
 229                 s = min ((*i)->content->length(), s);
 230                 (*i)->decoder->seek (s);
 231         }
 232
 233         /* XXX: don't seek audio because we don't need to... */
 234 }
 235
 236
 237 void
 238 Player::seek_back ()
 239 {
 240
 241 }
 242
 243 void
 244 Player::seek_forward ()
 245 {
 246
 247 }
 248
 249 void
 250 Player::add_black_piece (Time s, Time len)
 251 {
 252         shared_ptr<NullContent> nc (new NullContent (_film, s, len));
 253         nc->set_ratio (_film->container ());
 254         shared_ptr<BlackDecoder> bd (new BlackDecoder (_film, nc));
 255         bd->Video.connect (bind (&Player::process_video, this, nc, _1, _2, _3));
 256         _pieces.push_back (shared_ptr<Piece> (new Piece (nc, bd)));
 257 }
 258
 259 void
 260 Player::add_silent_piece (Time s, Time len)
 261 {
 262         shared_ptr<NullContent> nc (new NullContent (_film, s, len));
 263         shared_ptr<SilenceDecoder> sd (new SilenceDecoder (_film, nc));
 264         sd->Audio.connect (bind (&Player::process_audio, this, nc, _1, _2));
 265         _pieces.push_back (shared_ptr<Piece> (new Piece (nc, sd)));
 266 }
 267
 268
 269 void
 270 Player::setup_pieces ()
 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                 }
 297
 298                 shared_ptr<const ImageMagickContent> ic = dynamic_pointer_cast<const ImageMagickContent> (*i);
 299                 if (ic) {
 300                         shared_ptr<ImageMagickDecoder> id;
 301
 302                         /* See if we can re-use an old ImageMagickDecoder */
 303                         for (list<shared_ptr<Piece> >::const_iterator j = old_pieces.begin(); j != old_pieces.end(); ++j) {
 304                                 shared_ptr<ImageMagickDecoder> imd = dynamic_pointer_cast<ImageMagickDecoder> ((*j)->decoder);
 305                                 if (imd && imd->content() == ic) {
 306                                         id = imd;
 307                                 }
 308                         }
 309
 310                         if (!id) {
 311                                 id.reset (new ImageMagickDecoder (_film, ic));
 312                                 id->Video.connect (bind (&Player::process_video, this, *i, _1, _2, _3));
 313                                 if (_video_container_size) {
 314                                         id->set_video_container_size (_video_container_size.get ());
 315                                 }
 316                         }
 317
 318                         decoder = id;
 319                 }
 320
 321                 shared_ptr<const SndfileContent> sc = dynamic_pointer_cast<const SndfileContent> (*i);
 322                 if (sc) {
 323                         shared_ptr<AudioDecoder> sd (new SndfileDecoder (_film, sc));
 324                         sd->Audio.connect (bind (&Player::process_audio, this, *i, _1, _2));
 325
 326                         decoder = sd;
 327                 }
 328
 329                 _pieces.push_back (shared_ptr<Piece> (new Piece (*i, decoder)));
 330         }
 331
 332         /* Fill in visual gaps with black and audio gaps with silence */
 333
 334         Time video_pos = 0;
 335         Time audio_pos = 0;
 336         list<shared_ptr<Piece> > pieces_copy = _pieces;
 337         for (list<shared_ptr<Piece> >::iterator i = pieces_copy.begin(); i != pieces_copy.end(); ++i) {
 338                 if (dynamic_pointer_cast<VideoContent> ((*i)->content)) {
 339                         Time const diff = (*i)->content->start() - video_pos;
 340                         if (diff > 0) {
 341                                 add_black_piece (video_pos, diff);
 342                         }
 343                         video_pos = (*i)->content->end();
 344                 }
 345
 346                 shared_ptr<AudioContent> ac = dynamic_pointer_cast<AudioContent> ((*i)->content);
 347                 if (ac && ac->audio_channels()) {
 348                         Time const diff = (*i)->content->start() - audio_pos;
 349                         if (diff > 0) {
 350                                 add_silent_piece (video_pos, diff);
 351                         }
 352                         audio_pos = (*i)->content->end();
 353                 }
 354         }
 355
 356         if (video_pos < audio_pos) {
 357                 add_black_piece (video_pos, audio_pos - video_pos);
 358         } else if (audio_pos < video_pos) {
 359                 add_silent_piece (audio_pos, video_pos - audio_pos);
 360         }
 361
 362 #ifdef DEBUG_PLAYER
 363         cout << "=== Player setup:\n";
 364         for (list<shared_ptr<Piece> >::iterator i = _pieces.begin(); i != _pieces.end(); ++i) {
 365                 cout << *(i->get()) << "\n";
 366         }
 367 #endif
 368 }
 369
 370 void
 371 Player::content_changed (weak_ptr<Content> w, int p)
 372 {
 373         shared_ptr<Content> c = w.lock ();
 374         if (!c) {
 375                 return;
 376         }
 377
 378         if (p == ContentProperty::START || p == ContentProperty::LENGTH) {
 379                 _have_valid_pieces = false;
 380         }
 381 }
 382
 383 void
 384 Player::playlist_changed ()
 385 {
 386         _have_valid_pieces = false;
 387 }
 388
 389 void
 390 Player::set_video_container_size (libdcp::Size s)
 391 {
 392         _video_container_size = s;
 393         for (list<shared_ptr<Piece> >::iterator i = _pieces.begin(); i != _pieces.end(); ++i) {
 394                 shared_ptr<VideoDecoder> vd = dynamic_pointer_cast<VideoDecoder> ((*i)->decoder);
 395                 if (vd) {
 396                         vd->set_video_container_size (s);
 397                 }
 398         }
 399 }