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
  31 using std::list;
  32 using std::cout;
  33 using std::vector;
  34 using boost::shared_ptr;
  35 using boost::weak_ptr;
  36 using boost::dynamic_pointer_cast;
  37
  38 Player::Player (shared_ptr<const Film> f, shared_ptr<const Playlist> p)
  39         : _film (f)
  40         , _playlist (p)
  41         , _video (true)
  42         , _audio (true)
  43         , _subtitles (true)
  44         , _have_valid_decoders (false)
  45 {
  46         _playlist->Changed.connect (bind (&Player::playlist_changed, this));
  47         _playlist->ContentChanged.connect (bind (&Player::content_changed, this, _1, _2));
  48 }
  49
  50 void
  51 Player::disable_video ()
  52 {
  53         _video = false;
  54 }
  55
  56 void
  57 Player::disable_audio ()
  58 {
  59         _audio = false;
  60 }
  61
  62 void
  63 Player::disable_subtitles ()
  64 {
  65         _subtitles = false;
  66 }
  67
  68 bool
  69 Player::pass ()
  70 {
  71         if (!_have_valid_decoders) {
  72                 setup_decoders ();
  73                 _have_valid_decoders = true;
  74         }
  75
  76         bool done = true;
  77
  78         if (_video && _video_decoder < _video_decoders.size ()) {
  79
  80                 /* Run video decoder; this may also produce audio */
  81
  82                 if (_video_decoders[_video_decoder]->pass ()) {
  83                         _video_decoder++;
  84                 }
  85
  86                 if (_video_decoder < _video_decoders.size ()) {
  87                         done = false;
  88                 }
  89
  90         }
  91
  92         if (!_video && _audio && _playlist->audio_from() == Playlist::AUDIO_FFMPEG && _sequential_audio_decoder < _audio_decoders.size ()) {
  93
  94                 /* We're not producing video, so we may need to run FFmpeg content to get the audio */
  95
  96                 if (_audio_decoders[_sequential_audio_decoder]->pass ()) {
  97                         _sequential_audio_decoder++;
  98                 }
  99
 100                 if (_sequential_audio_decoder < _audio_decoders.size ()) {
 101                         done = false;
 102                 }
 103
 104         }
 105
 106         if (_audio && _playlist->audio_from() == Playlist::AUDIO_SNDFILE) {
 107
 108                 /* We're getting audio from SndfileContent */
 109
 110                 for (vector<shared_ptr<AudioDecoder> >::iterator i = _audio_decoders.begin(); i != _audio_decoders.end(); ++i) {
 111                         if (!(*i)->pass ()) {
 112                                 done = false;
 113                         }
 114                 }
 115
 116                 Audio (_audio_buffers, _audio_time.get());
 117                 _audio_buffers.reset ();
 118                 _audio_time = boost::none;
 119         }
 120
 121         return done;
 122 }
 123
 124 void
 125 Player::process_video (shared_ptr<const Image> i, bool same, shared_ptr<Subtitle> s, double t)
 126 {
 127         Video (i, same, s, _video_start[_video_decoder] + t);
 128 }
 129
 130 void
 131 Player::process_audio (weak_ptr<const AudioContent> c, shared_ptr<const AudioBuffers> b, double t)
 132 {
 133         AudioMapping mapping = _film->audio_mapping ();
 134         if (!_audio_buffers) {
 135                 _audio_buffers.reset (new AudioBuffers (mapping.dcp_channels(), b->frames ()));
 136                 _audio_buffers->make_silent ();
 137                 _audio_time = t;
 138                 if (_playlist->audio_from() == Playlist::AUDIO_FFMPEG) {
 139                         _audio_time = _audio_time.get() + _audio_start[_sequential_audio_decoder];
 140                 }
 141         }
 142
 143         for (int i = 0; i < b->channels(); ++i) {
 144                 list<libdcp::Channel> dcp = mapping.content_to_dcp (AudioMapping::Channel (c, i));
 145                 for (list<libdcp::Channel>::iterator j = dcp.begin(); j != dcp.end(); ++j) {
 146                         _audio_buffers->accumulate (b, i, static_cast<int> (*j));
 147                 }
 148         }
 149
 150         if (_playlist->audio_from() == Playlist::AUDIO_FFMPEG) {
 151                 /* We can just emit this audio now as it will all be here */
 152                 Audio (_audio_buffers, t);
 153                 _audio_buffers.reset ();
 154                 _audio_time = boost::none;
 155         }
 156 }
 157
 158 /** @return true on error */
 159 bool
 160 Player::seek (double t)
 161 {
 162         if (!_have_valid_decoders) {
 163                 setup_decoders ();
 164                 _have_valid_decoders = true;
 165         }
 166
 167         if (_video_decoders.empty ()) {
 168                 return true;
 169         }
 170
 171         /* Find the decoder that contains this position */
 172         _video_decoder = 0;
 173         while (1) {
 174                 ++_video_decoder;
 175                 if (_video_decoder >= _video_decoders.size () || t < _video_start[_video_decoder]) {
 176                         --_video_decoder;
 177                         t -= _video_start[_video_decoder];
 178                         break;
 179                 }
 180         }
 181
 182         if (_video_decoder < _video_decoders.size()) {
 183                 _video_decoders[_video_decoder]->seek (t);
 184         } else {
 185                 return true;
 186         }
 187
 188         /* XXX: don't seek audio because we don't need to... */
 189
 190         return false;
 191 }
 192
 193
 194 void
 195 Player::seek_back ()
 196 {
 197         /* XXX */
 198 }
 199
 200 void
 201 Player::seek_forward ()
 202 {
 203         /* XXX */
 204 }
 205
 206
 207 void
 208 Player::setup_decoders ()
 209 {
 210         vector<shared_ptr<VideoDecoder> > old_video_decoders = _video_decoders;
 211
 212         _video_decoders.clear ();
 213         _video_decoder = 0;
 214         _audio_decoders.clear ();
 215         _sequential_audio_decoder = 0;
 216
 217         _video_start.clear();
 218         _audio_start.clear();
 219
 220         double video_so_far = 0;
 221         double audio_so_far = 0;
 222
 223         for (int l = 0; l < _playlist->loop(); ++l) {
 224                 list<shared_ptr<const VideoContent> > vc = _playlist->video ();
 225                 for (list<shared_ptr<const VideoContent> >::iterator i = vc.begin(); i != vc.end(); ++i) {
 226
 227                         shared_ptr<const VideoContent> video_content;
 228                         shared_ptr<const AudioContent> audio_content;
 229                         shared_ptr<VideoDecoder> video_decoder;
 230                         shared_ptr<AudioDecoder> audio_decoder;
 231
 232                         /* XXX: into content? */
 233
 234                         shared_ptr<const FFmpegContent> fc = dynamic_pointer_cast<const FFmpegContent> (*i);
 235                         if (fc) {
 236                                 shared_ptr<FFmpegDecoder> fd (
 237                                         new FFmpegDecoder (
 238                                                 _film, fc, _video,
 239                                                 _audio && _playlist->audio_from() == Playlist::AUDIO_FFMPEG,
 240                                                 _subtitles
 241                                                 )
 242                                         );
 243
 244                                 video_content = fc;
 245                                 audio_content = fc;
 246                                 video_decoder = fd;
 247                                 audio_decoder = fd;
 248
 249                                 video_decoder->connect_video (shared_from_this ());
 250                         }
 251
 252                         shared_ptr<const ImageMagickContent> ic = dynamic_pointer_cast<const ImageMagickContent> (*i);
 253                         if (ic) {
 254                                 video_content = ic;
 255
 256                                 /* See if we can re-use an old ImageMagickDecoder */
 257                                 for (vector<shared_ptr<VideoDecoder> >::const_iterator i = old_video_decoders.begin(); i != old_video_decoders.end(); ++i) {
 258                                         shared_ptr<ImageMagickDecoder> imd = dynamic_pointer_cast<ImageMagickDecoder> (*i);
 259                                         if (imd && imd->content() == ic) {
 260                                                 video_decoder = *i;
 261                                         }
 262                                 }
 263
 264                                 if (!video_decoder) {
 265                                         video_decoder.reset (new ImageMagickDecoder (_film, ic));
 266                                         video_decoder->connect_video (shared_from_this ());
 267                                 }
 268                         }
 269
 270                         _video_decoders.push_back (video_decoder);
 271                         _video_start.push_back (video_so_far);
 272                         video_so_far += video_content->video_length() / video_content->video_frame_rate();
 273
 274                         if (audio_decoder && _playlist->audio_from() == Playlist::AUDIO_FFMPEG) {
 275                                 audio_decoder->Audio.connect (bind (&Player::process_audio, this, audio_content, _1, _2));
 276                                 _audio_decoders.push_back (audio_decoder);
 277                                 _audio_start.push_back (audio_so_far);
 278                                 audio_so_far += double(audio_content->audio_length()) / audio_content->audio_frame_rate();
 279                         }
 280                 }
 281
 282                 _video_decoder = 0;
 283                 _sequential_audio_decoder = 0;
 284
 285                 if (_playlist->audio_from() == Playlist::AUDIO_SNDFILE) {
 286
 287                         list<shared_ptr<const AudioContent> > ac = _playlist->audio ();
 288                         for (list<shared_ptr<const AudioContent> >::iterator i = ac.begin(); i != ac.end(); ++i) {
 289
 290                                 shared_ptr<const SndfileContent> sc = dynamic_pointer_cast<const SndfileContent> (*i);
 291                                 assert (sc);
 292
 293                                 shared_ptr<AudioDecoder> d (new SndfileDecoder (_film, sc));
 294                                 d->Audio.connect (bind (&Player::process_audio, this, sc, _1, _2));
 295                                 _audio_decoders.push_back (d);
 296                                 _audio_start.push_back (audio_so_far);
 297                         }
 298                 }
 299         }
 300 }
 301
 302 double
 303 Player::last_video_time () const
 304 {
 305         if (_video_decoder >= _video_decoders.size ()) {
 306                 return 0;
 307         }
 308
 309         return _video_start[_video_decoder] + _video_decoders[_video_decoder]->last_content_time ();
 310 }
 311
 312 void
 313 Player::content_changed (weak_ptr<Content> w, int p)
 314 {
 315         shared_ptr<Content> c = w.lock ();
 316         if (!c) {
 317                 return;
 318         }
 319
 320         if (p == VideoContentProperty::VIDEO_LENGTH) {
 321                 _have_valid_decoders = false;
 322         }
 323 }
 324
 325 void
 326 Player::playlist_changed ()
 327 {
 328         _have_valid_decoders = false;
 329 }