src/lib/player.cc

   1 /* -*- c-basic-offset: 8; default-tab-width: 8; -*- */
   2
   3 /*
   4     Copyright (C) 2013 Carl Hetherington <cth@carlh.net>
   5
   6     This program is free software; you can redistribute it and/or modify
   7     it under the terms of the GNU General Public License as published by
   8     the Free Software Foundation; either version 2 of the License, or
   9     (at your option) any later version.
  10
  11     This program is distributed in the hope that it will be useful,
  12     but WITHOUT ANY WARRANTY; without even the implied warranty of
  13     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14     GNU General Public License for more details.
  15
  16     You should have received a copy of the GNU General Public License
  17     along with this program; if not, write to the Free Software
  18     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  19
  20 */
  21
  22 #include "player.h"
  23 #include "film.h"
  24 #include "ffmpeg_decoder.h"
  25 #include "ffmpeg_content.h"
  26 #include "imagemagick_decoder.h"
  27 #include "imagemagick_content.h"
  28 #include "sndfile_decoder.h"
  29 #include "sndfile_content.h"
  30 #include "playlist.h"
  31 #include "job.h"
  32 #include "image.h"
  33 #include "null_content.h"
  34 #include "black_decoder.h"
  35 #include "silence_decoder.h"
  36
  37 using std::list;
  38 using std::cout;
  39 using std::min;
  40 using std::max;
  41 using std::vector;
  42 using boost::shared_ptr;
  43 using boost::weak_ptr;
  44 using boost::dynamic_pointer_cast;
  45
  46 struct Piece
  47 {
  48         Piece (shared_ptr<Content> c, shared_ptr<Decoder> d)
  49                 : content (c)
  50                 , decoder (d)
  51         {}
  52
  53         shared_ptr<Content> content;
  54         shared_ptr<Decoder> decoder;
  55 };
  56
  57 Player::Player (shared_ptr<const Film> f, shared_ptr<const Playlist> p)
  58         : _film (f)
  59         , _playlist (p)
  60         , _video (true)
  61         , _audio (true)
  62         , _subtitles (true)
  63         , _have_valid_pieces (false)
  64         , _position (0)
  65         , _audio_buffers (f->dcp_audio_channels(), 0)
  66         , _next_audio (0)
  67 {
  68         _playlist->Changed.connect (bind (&Player::playlist_changed, this));
  69         _playlist->ContentChanged.connect (bind (&Player::content_changed, this, _1, _2));
  70 }
  71
  72 void
  73 Player::disable_video ()
  74 {
  75         _video = false;
  76 }
  77
  78 void
  79 Player::disable_audio ()
  80 {
  81         _audio = false;
  82 }
  83
  84 void
  85 Player::disable_subtitles ()
  86 {
  87         _subtitles = false;
  88 }
  89
  90 bool
  91 Player::pass ()
  92 {
  93         if (!_have_valid_pieces) {
  94                 setup_pieces ();
  95                 _have_valid_pieces = true;
  96         }
  97
  98         /* Here we are just finding the active decoder with the earliest last emission time, then
  99            calling pass on it.
 100         */
 101
 102         Time earliest_t = TIME_MAX;
 103         shared_ptr<Piece> earliest;
 104
 105         for (list<shared_ptr<Piece> >::iterator i = _pieces.begin(); i != _pieces.end(); ++i) {
 106                 cout << "check " << (*i)->content->file() << " start=" << (*i)->content->start() << ", next=" << (*i)->decoder->next() << ", end=" << (*i)->content->end() << "\n";
 107                 if (((*i)->decoder->next() + (*i)->content->start()) >= (*i)->content->end()) {
 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                 return true;
 121         }
 122
 123         cout << "PASS:\n";
 124         cout << "\tpass " << earliest->content->file() << " ";
 125         if (dynamic_pointer_cast<FFmpegContent> (earliest->content)) {
 126                 cout << " FFmpeg.\n";
 127         } else if (dynamic_pointer_cast<ImageMagickContent> (earliest->content)) {
 128                 cout << " ImageMagickContent.\n";
 129         } else if (dynamic_pointer_cast<SndfileContent> (earliest->content)) {
 130                 cout << " SndfileContent.\n";
 131         } else if (dynamic_pointer_cast<BlackDecoder> (earliest->decoder)) {
 132                 cout << " Black.\n";
 133         } else if (dynamic_pointer_cast<SilenceDecoder> (earliest->decoder)) {
 134                 cout << " Silence.\n";
 135         }
 136
 137         earliest->decoder->pass ();
 138         _position = earliest->content->start() + earliest->decoder->next ();
 139         cout << "\tpassed to " << _position << " " << (_position / TIME_HZ) << "\n";
 140
 141         return false;
 142 }
 143
 144 void
 145 Player::process_video (weak_ptr<Content> weak_content, shared_ptr<const Image> image, bool same, shared_ptr<Subtitle> sub, Time time)
 146 {
 147         cout << "[V]\n";
 148
 149         shared_ptr<Content> content = weak_content.lock ();
 150         if (!content) {
 151                 return;
 152         }
 153
 154         time += content->start ();
 155
 156         Video (image, same, sub, time);
 157 }
 158
 159 void
 160 Player::process_audio (weak_ptr<Content> weak_content, shared_ptr<const AudioBuffers> audio, Time time)
 161 {
 162         shared_ptr<Content> content = weak_content.lock ();
 163         if (!content) {
 164                 return;
 165         }
 166
 167         /* The time of this audio may indicate that some of our buffered audio is not going to
 168            be added to any more, so it can be emitted.
 169         */
 170
 171         time += content->start ();
 172
 173         if (time > _next_audio) {
 174                 /* We can emit some audio from our buffers */
 175                 assert (_film->time_to_audio_frames (time - _next_audio) <= _audio_buffers.frames());
 176                 OutputAudioFrame const N = _film->time_to_audio_frames (time - _next_audio);
 177                 shared_ptr<AudioBuffers> emit (new AudioBuffers (_audio_buffers.channels(), N));
 178                 emit->copy_from (&_audio_buffers, N, 0, 0);
 179                 Audio (emit, _next_audio);
 180                 _next_audio += _film->audio_frames_to_time (N);
 181
 182                 /* And remove it from our buffers */
 183                 if (_audio_buffers.frames() > N) {
 184                         _audio_buffers.move (N, 0, _audio_buffers.frames() - N);
 185                 }
 186                 _audio_buffers.set_frames (_audio_buffers.frames() - N);
 187         }
 188
 189         /* Now accumulate the new audio into our buffers */
 190         _audio_buffers.ensure_size (_audio_buffers.frames() + audio->frames());
 191         _audio_buffers.accumulate_frames (audio, 0, 0, audio->frames ());
 192 }
 193
 194 /** @return true on error */
 195 void
 196 Player::seek (Time t)
 197 {
 198         if (!_have_valid_pieces) {
 199                 setup_pieces ();
 200                 _have_valid_pieces = true;
 201         }
 202
 203         if (_pieces.empty ()) {
 204                 return;
 205         }
 206
 207         cout << "seek to " << t << " " << (t / TIME_HZ) << "\n";
 208
 209         for (list<shared_ptr<Piece> >::iterator i = _pieces.begin(); i != _pieces.end(); ++i) {
 210                 Time s = t - (*i)->content->start ();
 211                 s = max (static_cast<Time> (0), s);
 212                 s = min ((*i)->content->length(), s);
 213                 cout << "seek [" << (*i)->content->file() << "," << (*i)->content->start() << "," << (*i)->content->end() << "] to " << s << "\n";
 214                 (*i)->decoder->seek (s);
 215         }
 216
 217         /* XXX: don't seek audio because we don't need to... */
 218 }
 219
 220
 221 void
 222 Player::seek_back ()
 223 {
 224
 225 }
 226
 227 void
 228 Player::seek_forward ()
 229 {
 230
 231 }
 232
 233 struct ContentSorter
 234 {
 235         bool operator() (shared_ptr<Content> a, shared_ptr<Content> b)
 236         {
 237                 return a->start() < b->start();
 238         }
 239 };
 240
 241 void
 242 Player::setup_pieces ()
 243 {
 244 //      cout << "----- Player SETUP PIECES.\n";
 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, _subtitles));
 262
 263                         fd->Video.connect (bind (&Player::process_video, this, *i, _1, _2, _3, _4));
 264                         fd->Audio.connect (bind (&Player::process_audio, this, *i, _1, _2));
 265
 266                         decoder = fd;
 267 //                      cout << "\tFFmpeg @ " << fc->start() << " -- " << fc->end() << "\n";
 268                 }
 269
 270                 shared_ptr<const ImageMagickContent> ic = dynamic_pointer_cast<const ImageMagickContent> (*i);
 271                 if (ic) {
 272                         shared_ptr<ImageMagickDecoder> id;
 273
 274                         /* See if we can re-use an old ImageMagickDecoder */
 275                         for (list<shared_ptr<Piece> >::const_iterator j = old_pieces.begin(); j != old_pieces.end(); ++j) {
 276                                 shared_ptr<ImageMagickDecoder> imd = dynamic_pointer_cast<ImageMagickDecoder> ((*j)->decoder);
 277                                 if (imd && imd->content() == ic) {
 278                                         id = imd;
 279                                 }
 280                         }
 281
 282                         if (!id) {
 283                                 id.reset (new ImageMagickDecoder (_film, ic));
 284                                 id->Video.connect (bind (&Player::process_video, this, *i, _1, _2, _3, _4));
 285                         }
 286
 287                         decoder = id;
 288 //                      cout << "\tImageMagick @ " << ic->start() << " -- " << ic->end() << "\n";
 289                 }
 290
 291                 shared_ptr<const SndfileContent> sc = dynamic_pointer_cast<const SndfileContent> (*i);
 292                 if (sc) {
 293                         shared_ptr<AudioDecoder> sd (new SndfileDecoder (_film, sc));
 294                         sd->Audio.connect (bind (&Player::process_audio, this, *i, _1, _2));
 295
 296                         decoder = sd;
 297 //                      cout << "\tSndfile @ " << sc->start() << " -- " << sc->end() << "\n";
 298                 }
 299
 300                 _pieces.push_back (shared_ptr<Piece> (new Piece (*i, decoder)));
 301         }
 302
 303         /* Fill in visual gaps with black and audio gaps with silence */
 304
 305         Time video_pos = 0;
 306         Time audio_pos = 0;
 307         list<shared_ptr<Piece> > pieces_copy = _pieces;
 308         for (list<shared_ptr<Piece> >::iterator i = pieces_copy.begin(); i != pieces_copy.end(); ++i) {
 309                 if (dynamic_pointer_cast<VideoContent> ((*i)->content)) {
 310                         Time const diff = (*i)->content->start() - video_pos;
 311                         if (diff > 0) {
 312                                 shared_ptr<NullContent> nc (new NullContent (_film, video_pos, diff));
 313                                 shared_ptr<BlackDecoder> bd (new BlackDecoder (_film, nc));
 314                                 bd->Video.connect (bind (&Player::process_video, this, nc, _1, _2, _3, _4));
 315                                 _pieces.push_back (shared_ptr<Piece> (new Piece (nc, bd)));
 316 //                              cout << "\tblack @ " << video_pos << " -- " << (video_pos + diff) << "\n";
 317                         }
 318
 319                         video_pos = (*i)->content->end();
 320                 } else {
 321                         Time const diff = (*i)->content->start() - audio_pos;
 322                         if (diff > 0) {
 323                                 shared_ptr<NullContent> nc (new NullContent (_film, audio_pos, diff));
 324                                 shared_ptr<SilenceDecoder> sd (new SilenceDecoder (_film, nc));
 325                                 sd->Audio.connect (bind (&Player::process_audio, this, nc, _1, _2));
 326                                 _pieces.push_back (shared_ptr<Piece> (new Piece (nc, sd)));
 327 //                              cout << "\tsilence @ " << audio_pos << " -- " << (audio_pos + diff) << "\n";
 328                         }
 329                         audio_pos = (*i)->content->end();
 330                 }
 331         }
 332 }
 333
 334 void
 335 Player::content_changed (weak_ptr<Content> w, int p)
 336 {
 337         shared_ptr<Content> c = w.lock ();
 338         if (!c) {
 339                 return;
 340         }
 341
 342         if (p == ContentProperty::START || p == VideoContentProperty::VIDEO_LENGTH) {
 343                 _have_valid_pieces = false;
 344         }
 345 }
 346
 347 void
 348 Player::playlist_changed ()
 349 {
 350         _have_valid_pieces = false;
 351 }