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                 if ((*i)->decoder->done ()) {
  99                         continue;
 100                 }
 101
 102                 if (!_audio && dynamic_pointer_cast<AudioDecoder> ((*i)->decoder) && !dynamic_pointer_cast<VideoDecoder> ((*i)->decoder)) {
 103                         continue;
 104                 }
 105
 106                 Time const t = (*i)->content->start() + (*i)->decoder->position();
 107                 if (t < earliest_t) {
 108                         earliest_t = t;
 109                         earliest = *i;
 110                 }
 111         }
 112
 113         if (!earliest) {
 114                 flush ();
 115                 return true;
 116         }
 117
 118         earliest->decoder->pass ();
 119         _position = earliest->content->start() + earliest->decoder->position ();
 120
 121         return false;
 122 }
 123
 124 void
 125 Player::process_video (weak_ptr<Content> weak_content, shared_ptr<const Image> image, bool same, Time time)
 126 {
 127         shared_ptr<Content> content = weak_content.lock ();
 128         if (!content) {
 129                 return;
 130         }
 131
 132         time += content->start ();
 133
 134         Video (image, same, time);
 135 }
 136
 137 void
 138 Player::process_audio (weak_ptr<Content> weak_content, shared_ptr<const AudioBuffers> audio, Time time)
 139 {
 140         shared_ptr<Content> content = weak_content.lock ();
 141         if (!content) {
 142                 return;
 143         }
 144
 145         /* The time of this audio may indicate that some of our buffered audio is not going to
 146            be added to any more, so it can be emitted.
 147         */
 148
 149         time += content->start ();
 150
 151         cout << "Player gets " << audio->frames() << " @ " << time << " cf " << _next_audio << "\n";
 152
 153         if (time > _next_audio) {
 154                 /* We can emit some audio from our buffers */
 155                 OutputAudioFrame const N = _film->time_to_audio_frames (time - _next_audio);
 156                 assert (N <= _audio_buffers.frames());
 157                 shared_ptr<AudioBuffers> emit (new AudioBuffers (_audio_buffers.channels(), N));
 158                 emit->copy_from (&_audio_buffers, N, 0, 0);
 159                 Audio (emit, _next_audio);
 160                 _next_audio += _film->audio_frames_to_time (N);
 161
 162                 /* And remove it from our buffers */
 163                 if (_audio_buffers.frames() > N) {
 164                         _audio_buffers.move (N, 0, _audio_buffers.frames() - N);
 165                 }
 166                 _audio_buffers.set_frames (_audio_buffers.frames() - N);
 167         }
 168
 169         /* Now accumulate the new audio into our buffers */
 170         _audio_buffers.ensure_size (_audio_buffers.frames() + audio->frames());
 171         _audio_buffers.accumulate_frames (audio.get(), 0, 0, audio->frames ());
 172         _audio_buffers.set_frames (_audio_buffers.frames() + audio->frames());
 173 }
 174
 175 void
 176 Player::flush ()
 177 {
 178         if (_audio_buffers.frames() > 0) {
 179                 shared_ptr<AudioBuffers> emit (new AudioBuffers (_audio_buffers.channels(), _audio_buffers.frames()));
 180                 emit->copy_from (&_audio_buffers, _audio_buffers.frames(), 0, 0);
 181                 Audio (emit, _next_audio);
 182                 _next_audio += _film->audio_frames_to_time (_audio_buffers.frames ());
 183                 _audio_buffers.set_frames (0);
 184         }
 185 }
 186
 187 /** @return true on error */
 188 void
 189 Player::seek (Time t)
 190 {
 191         if (!_have_valid_pieces) {
 192                 setup_pieces ();
 193                 _have_valid_pieces = true;
 194         }
 195
 196         if (_pieces.empty ()) {
 197                 return;
 198         }
 199
 200         for (list<shared_ptr<Piece> >::iterator i = _pieces.begin(); i != _pieces.end(); ++i) {
 201                 Time s = t - (*i)->content->start ();
 202                 s = max (static_cast<Time> (0), s);
 203                 s = min ((*i)->content->length(), s);
 204                 (*i)->decoder->seek (s);
 205         }
 206
 207         /* XXX: don't seek audio because we don't need to... */
 208 }
 209
 210
 211 void
 212 Player::seek_back ()
 213 {
 214
 215 }
 216
 217 void
 218 Player::seek_forward ()
 219 {
 220
 221 }
 222
 223 void
 224 Player::add_black_piece (Time s, Time len)
 225 {
 226         shared_ptr<NullContent> nc (new NullContent (_film, s, len));
 227         nc->set_ratio (_film->container ());
 228         shared_ptr<BlackDecoder> bd (new BlackDecoder (_film, nc));
 229         bd->Video.connect (bind (&Player::process_video, this, nc, _1, _2, _3));
 230         _pieces.push_back (shared_ptr<Piece> (new Piece (nc, bd)));
 231 }
 232
 233 void
 234 Player::add_silent_piece (Time s, Time len)
 235 {
 236         shared_ptr<NullContent> nc (new NullContent (_film, s, len));
 237         shared_ptr<SilenceDecoder> sd (new SilenceDecoder (_film, nc));
 238         sd->Audio.connect (bind (&Player::process_audio, this, nc, _1, _2));
 239         _pieces.push_back (shared_ptr<Piece> (new Piece (nc, sd)));
 240 }
 241
 242
 243 void
 244 Player::setup_pieces ()
 245 {
 246         list<shared_ptr<Piece> > old_pieces = _pieces;
 247
 248         _pieces.clear ();
 249
 250         Playlist::ContentList content = _playlist->content ();
 251         sort (content.begin(), content.end(), ContentSorter ());
 252
 253         for (Playlist::ContentList::iterator i = content.begin(); i != content.end(); ++i) {
 254
 255                 shared_ptr<Decoder> decoder;
 256
 257                 /* XXX: into content? */
 258
 259                 shared_ptr<const FFmpegContent> fc = dynamic_pointer_cast<const FFmpegContent> (*i);
 260                 if (fc) {
 261                         shared_ptr<FFmpegDecoder> fd (new FFmpegDecoder (_film, fc, _video, _audio));
 262
 263                         fd->Video.connect (bind (&Player::process_video, this, *i, _1, _2, _3));
 264                         fd->Audio.connect (bind (&Player::process_audio, this, *i, _1, _2));
 265                         if (_video_container_size) {
 266                                 fd->set_video_container_size (_video_container_size.get ());
 267                         }
 268
 269                         decoder = fd;
 270                 }
 271
 272                 shared_ptr<const ImageMagickContent> ic = dynamic_pointer_cast<const ImageMagickContent> (*i);
 273                 if (ic) {
 274                         shared_ptr<ImageMagickDecoder> id;
 275
 276                         /* See if we can re-use an old ImageMagickDecoder */
 277                         for (list<shared_ptr<Piece> >::const_iterator j = old_pieces.begin(); j != old_pieces.end(); ++j) {
 278                                 shared_ptr<ImageMagickDecoder> imd = dynamic_pointer_cast<ImageMagickDecoder> ((*j)->decoder);
 279                                 if (imd && imd->content() == ic) {
 280                                         id = imd;
 281                                 }
 282                         }
 283
 284                         if (!id) {
 285                                 id.reset (new ImageMagickDecoder (_film, ic));
 286                                 id->Video.connect (bind (&Player::process_video, this, *i, _1, _2, _3));
 287                                 if (_video_container_size) {
 288                                         id->set_video_container_size (_video_container_size.get ());
 289                                 }
 290                         }
 291
 292                         decoder = id;
 293                 }
 294
 295                 shared_ptr<const SndfileContent> sc = dynamic_pointer_cast<const SndfileContent> (*i);
 296                 if (sc) {
 297                         shared_ptr<AudioDecoder> sd (new SndfileDecoder (_film, sc));
 298                         sd->Audio.connect (bind (&Player::process_audio, this, *i, _1, _2));
 299
 300                         decoder = sd;
 301                 }
 302
 303                 _pieces.push_back (shared_ptr<Piece> (new Piece (*i, decoder)));
 304         }
 305
 306         /* Fill in visual gaps with black and audio gaps with silence */
 307
 308         Time video_pos = 0;
 309         Time audio_pos = 0;
 310         list<shared_ptr<Piece> > pieces_copy = _pieces;
 311         for (list<shared_ptr<Piece> >::iterator i = pieces_copy.begin(); i != pieces_copy.end(); ++i) {
 312                 if (dynamic_pointer_cast<VideoContent> ((*i)->content)) {
 313                         Time const diff = (*i)->content->start() - video_pos;
 314                         if (diff > 0) {
 315                                 add_black_piece (video_pos, diff);
 316                         }
 317                         video_pos = (*i)->content->end();
 318                 }
 319
 320                 shared_ptr<AudioContent> ac = dynamic_pointer_cast<AudioContent> ((*i)->content);
 321                 if (ac && ac->audio_channels()) {
 322                         Time const diff = (*i)->content->start() - audio_pos;
 323                         if (diff > 0) {
 324                                 add_silent_piece (video_pos, diff);
 325                         }
 326                         audio_pos = (*i)->content->end();
 327                 }
 328         }
 329
 330         if (video_pos < audio_pos) {
 331                 add_black_piece (video_pos, audio_pos - video_pos);
 332         } else if (audio_pos < video_pos) {
 333                 add_silent_piece (audio_pos, video_pos - audio_pos);
 334         }
 335 }
 336
 337 void
 338 Player::content_changed (weak_ptr<Content> w, int p)
 339 {
 340         shared_ptr<Content> c = w.lock ();
 341         if (!c) {
 342                 return;
 343         }
 344
 345         if (p == ContentProperty::START || p == ContentProperty::LENGTH) {
 346                 _have_valid_pieces = false;
 347         }
 348 }
 349
 350 void
 351 Player::playlist_changed ()
 352 {
 353         _have_valid_pieces = false;
 354 }
 355
 356 void
 357 Player::set_video_container_size (libdcp::Size s)
 358 {
 359         _video_container_size = s;
 360         for (list<shared_ptr<Piece> >::iterator i = _pieces.begin(); i != _pieces.end(); ++i) {
 361                 shared_ptr<VideoDecoder> vd = dynamic_pointer_cast<VideoDecoder> ((*i)->decoder);
 362                 if (vd) {
 363                         vd->set_video_container_size (s);
 364                 }
 365         }
 366 }