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                 if (!_audio && dynamic_pointer_cast<SndfileContent> ((*i)->content)) {
 112                         continue;
 113                 }
 114
 115                 Time const t = (*i)->content->start() + (*i)->decoder->next();
 116                 if (t < earliest_t) {
 117                         cout << "\t candidate; " << t << " " << (t / TIME_HZ) << ".\n";
 118                         earliest_t = t;
 119                         earliest = *i;
 120                 }
 121         }
 122
 123         if (!earliest) {
 124                 return true;
 125         }
 126
 127         cout << "PASS:\n";
 128         cout << "\tpass " << earliest->content->file() << " ";
 129         if (dynamic_pointer_cast<FFmpegContent> (earliest->content)) {
 130                 cout << " FFmpeg.\n";
 131         } else if (dynamic_pointer_cast<ImageMagickContent> (earliest->content)) {
 132                 cout << " ImageMagickContent.\n";
 133         } else if (dynamic_pointer_cast<SndfileContent> (earliest->content)) {
 134                 cout << " SndfileContent.\n";
 135         } else if (dynamic_pointer_cast<BlackDecoder> (earliest->decoder)) {
 136                 cout << " Black.\n";
 137         } else if (dynamic_pointer_cast<SilenceDecoder> (earliest->decoder)) {
 138                 cout << " Silence.\n";
 139         }
 140
 141         earliest->decoder->pass ();
 142         _position = earliest->content->start() + earliest->decoder->next ();
 143         cout << "\tpassed to " << _position << " " << (_position / TIME_HZ) << "\n";
 144
 145         return false;
 146 }
 147
 148 void
 149 Player::process_video (weak_ptr<Content> weak_content, shared_ptr<const Image> image, bool same, shared_ptr<Subtitle> sub, Time time)
 150 {
 151         cout << "[V]\n";
 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, sub, 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         if (time > _next_audio) {
 178                 /* We can emit some audio from our buffers */
 179                 assert (_film->time_to_audio_frames (time - _next_audio) <= _audio_buffers.frames());
 180                 OutputAudioFrame const N = _film->time_to_audio_frames (time - _next_audio);
 181                 shared_ptr<AudioBuffers> emit (new AudioBuffers (_audio_buffers.channels(), N));
 182                 emit->copy_from (&_audio_buffers, N, 0, 0);
 183                 Audio (emit, _next_audio);
 184                 _next_audio += _film->audio_frames_to_time (N);
 185
 186                 /* And remove it from our buffers */
 187                 if (_audio_buffers.frames() > N) {
 188                         _audio_buffers.move (N, 0, _audio_buffers.frames() - N);
 189                 }
 190                 _audio_buffers.set_frames (_audio_buffers.frames() - N);
 191         }
 192
 193         /* Now accumulate the new audio into our buffers */
 194         _audio_buffers.ensure_size (_audio_buffers.frames() + audio->frames());
 195         _audio_buffers.accumulate_frames (audio.get(), 0, 0, audio->frames ());
 196 }
 197
 198 /** @return true on error */
 199 void
 200 Player::seek (Time t)
 201 {
 202         if (!_have_valid_pieces) {
 203                 setup_pieces ();
 204                 _have_valid_pieces = true;
 205         }
 206
 207         if (_pieces.empty ()) {
 208                 return;
 209         }
 210
 211         cout << "seek to " << t << " " << (t / TIME_HZ) << "\n";
 212
 213         for (list<shared_ptr<Piece> >::iterator i = _pieces.begin(); i != _pieces.end(); ++i) {
 214                 Time s = t - (*i)->content->start ();
 215                 s = max (static_cast<Time> (0), s);
 216                 s = min ((*i)->content->length(), s);
 217                 cout << "seek [" << (*i)->content->file() << "," << (*i)->content->start() << "," << (*i)->content->end() << "] to " << s << "\n";
 218                 (*i)->decoder->seek (s);
 219         }
 220
 221         /* XXX: don't seek audio because we don't need to... */
 222 }
 223
 224
 225 void
 226 Player::seek_back ()
 227 {
 228
 229 }
 230
 231 void
 232 Player::seek_forward ()
 233 {
 234
 235 }
 236
 237 struct ContentSorter
 238 {
 239         bool operator() (shared_ptr<Content> a, shared_ptr<Content> b)
 240         {
 241                 return a->start() < b->start();
 242         }
 243 };
 244
 245 void
 246 Player::setup_pieces ()
 247 {
 248 //      cout << "----- Player SETUP PIECES.\n";
 249
 250         list<shared_ptr<Piece> > old_pieces = _pieces;
 251
 252         _pieces.clear ();
 253
 254         Playlist::ContentList content = _playlist->content ();
 255         sort (content.begin(), content.end(), ContentSorter ());
 256
 257         for (Playlist::ContentList::iterator i = content.begin(); i != content.end(); ++i) {
 258
 259                 shared_ptr<Decoder> decoder;
 260
 261                 /* XXX: into content? */
 262
 263                 shared_ptr<const FFmpegContent> fc = dynamic_pointer_cast<const FFmpegContent> (*i);
 264                 if (fc) {
 265                         shared_ptr<FFmpegDecoder> fd (new FFmpegDecoder (_film, fc, _video, _audio, _subtitles));
 266
 267                         fd->Video.connect (bind (&Player::process_video, this, *i, _1, _2, _3, _4));
 268                         fd->Audio.connect (bind (&Player::process_audio, this, *i, _1, _2));
 269
 270                         decoder = fd;
 271 //                      cout << "\tFFmpeg @ " << fc->start() << " -- " << fc->end() << "\n";
 272                 }
 273
 274                 shared_ptr<const ImageMagickContent> ic = dynamic_pointer_cast<const ImageMagickContent> (*i);
 275                 if (ic) {
 276                         shared_ptr<ImageMagickDecoder> id;
 277
 278                         /* See if we can re-use an old ImageMagickDecoder */
 279                         for (list<shared_ptr<Piece> >::const_iterator j = old_pieces.begin(); j != old_pieces.end(); ++j) {
 280                                 shared_ptr<ImageMagickDecoder> imd = dynamic_pointer_cast<ImageMagickDecoder> ((*j)->decoder);
 281                                 if (imd && imd->content() == ic) {
 282                                         id = imd;
 283                                 }
 284                         }
 285
 286                         if (!id) {
 287                                 id.reset (new ImageMagickDecoder (_film, ic));
 288                                 id->Video.connect (bind (&Player::process_video, this, *i, _1, _2, _3, _4));
 289                         }
 290
 291                         decoder = id;
 292 //                      cout << "\tImageMagick @ " << ic->start() << " -- " << ic->end() << "\n";
 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 //                      cout << "\tSndfile @ " << sc->start() << " -- " << sc->end() << "\n";
 302                 }
 303
 304                 _pieces.push_back (shared_ptr<Piece> (new Piece (*i, decoder)));
 305         }
 306
 307         /* Fill in visual gaps with black and audio gaps with silence */
 308
 309         Time video_pos = 0;
 310         Time audio_pos = 0;
 311         list<shared_ptr<Piece> > pieces_copy = _pieces;
 312         for (list<shared_ptr<Piece> >::iterator i = pieces_copy.begin(); i != pieces_copy.end(); ++i) {
 313                 if (dynamic_pointer_cast<VideoContent> ((*i)->content)) {
 314                         Time const diff = (*i)->content->start() - video_pos;
 315                         if (diff > 0) {
 316                                 shared_ptr<NullContent> nc (new NullContent (_film, video_pos, diff));
 317                                 shared_ptr<BlackDecoder> bd (new BlackDecoder (_film, nc));
 318                                 bd->Video.connect (bind (&Player::process_video, this, nc, _1, _2, _3, _4));
 319                                 _pieces.push_back (shared_ptr<Piece> (new Piece (nc, bd)));
 320 //                              cout << "\tblack @ " << video_pos << " -- " << (video_pos + diff) << "\n";
 321                         }
 322
 323                         video_pos = (*i)->content->end();
 324                 } else {
 325                         Time const diff = (*i)->content->start() - audio_pos;
 326                         if (diff > 0) {
 327                                 shared_ptr<NullContent> nc (new NullContent (_film, audio_pos, diff));
 328                                 shared_ptr<SilenceDecoder> sd (new SilenceDecoder (_film, nc));
 329                                 sd->Audio.connect (bind (&Player::process_audio, this, nc, _1, _2));
 330                                 _pieces.push_back (shared_ptr<Piece> (new Piece (nc, sd)));
 331 //                              cout << "\tsilence @ " << audio_pos << " -- " << (audio_pos + diff) << "\n";
 332                         }
 333                         audio_pos = (*i)->content->end();
 334                 }
 335         }
 336 }
 337
 338 void
 339 Player::content_changed (weak_ptr<Content> w, int p)
 340 {
 341         shared_ptr<Content> c = w.lock ();
 342         if (!c) {
 343                 return;
 344         }
 345
 346         if (p == ContentProperty::START || p == VideoContentProperty::VIDEO_LENGTH) {
 347                 _have_valid_pieces = false;
 348         }
 349 }
 350
 351 void
 352 Player::playlist_changed ()
 353 {
 354         _have_valid_pieces = false;
 355 }