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 boost::shared_ptr;
  34 using boost::weak_ptr;
  35 using boost::dynamic_pointer_cast;
  36
  37 Player::Player (shared_ptr<const Film> f, shared_ptr<const Playlist> p)
  38         : _film (f)
  39         , _playlist (p)
  40         , _video (true)
  41         , _audio (true)
  42         , _subtitles (true)
  43         , _have_valid_decoders (false)
  44         , _video_sync (true)
  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_decoder != _video_decoders.end ()) {
  79                 if ((*_video_decoder)->pass ()) {
  80                         _video_decoder++;
  81                 }
  82
  83                 if (_video_decoder != _video_decoders.end ()) {
  84                         done = false;
  85                 }
  86         }
  87
  88         if (_playlist->audio_from() == Playlist::AUDIO_SNDFILE) {
  89                 for (list<shared_ptr<SndfileDecoder> >::iterator i = _sndfile_decoders.begin(); i != _sndfile_decoders.end(); ++i) {
  90                         if (!(*i)->pass ()) {
  91                                 done = false;
  92                         }
  93                 }
  94
  95                 Audio (_audio_buffers);
  96                 _audio_buffers.reset ();
  97         }
  98
  99         return done;
 100 }
 101
 102 void
 103 Player::set_progress (shared_ptr<Job> job)
 104 {
 105         /* Assume progress can be divined from how far through the video we are */
 106
 107         if (_video_decoder == _video_decoders.end() || !_playlist->video_length()) {
 108                 return;
 109         }
 110
 111         ContentVideoFrame p = 0;
 112         list<shared_ptr<VideoDecoder> >::iterator i = _video_decoders.begin ();
 113         while (i != _video_decoders.end() && i != _video_decoder) {
 114                 p += (*i)->video_length ();
 115         }
 116
 117         job->set_progress (float ((*_video_decoder)->video_frame ()) / _playlist->video_length ());
 118 }
 119
 120 void
 121 Player::process_video (shared_ptr<Image> i, bool same, shared_ptr<Subtitle> s)
 122 {
 123         Video (i, same, s);
 124 }
 125
 126 void
 127 Player::process_audio (weak_ptr<const AudioContent> c, shared_ptr<AudioBuffers> b)
 128 {
 129         AudioMapping mapping = _film->audio_mapping ();
 130         if (!_audio_buffers) {
 131                 _audio_buffers.reset (new AudioBuffers (mapping.dcp_channels(), b->frames ()));
 132                 _audio_buffers->make_silent ();
 133         }
 134
 135         for (int i = 0; i < b->channels(); ++i) {
 136                 list<libdcp::Channel> dcp = mapping.content_to_dcp (AudioMapping::Channel (c, i));
 137                 for (list<libdcp::Channel>::iterator j = dcp.begin(); j != dcp.end(); ++j) {
 138                         _audio_buffers->accumulate (b, i, static_cast<int> (*j));
 139                 }
 140         }
 141
 142         if (_playlist->audio_from() == Playlist::AUDIO_FFMPEG) {
 143                 /* We can just emit this audio now as it will all be here */
 144                 Audio (_audio_buffers);
 145                 _audio_buffers.reset ();
 146         }
 147 }
 148
 149 /** @return true on error */
 150 bool
 151 Player::seek (double t)
 152 {
 153         if (!_have_valid_decoders) {
 154                 setup_decoders ();
 155                 _have_valid_decoders = true;
 156         }
 157
 158         /* Find the decoder that contains this position */
 159         _video_decoder = _video_decoders.begin ();
 160         while (_video_decoder != _video_decoders.end ()) {
 161                 double const this_length = double ((*_video_decoder)->video_length()) / _film->video_frame_rate ();
 162                 if (t < this_length) {
 163                         break;
 164                 }
 165                 t -= this_length;
 166                 ++_video_decoder;
 167         }
 168
 169         if (_video_decoder != _video_decoders.end()) {
 170                 (*_video_decoder)->seek (t);
 171         } else {
 172                 return true;
 173         }
 174
 175         /* XXX: don't seek audio because we don't need to... */
 176
 177         return false;
 178 }
 179
 180 void
 181 Player::setup_decoders ()
 182 {
 183         _video_decoders.clear ();
 184         _video_decoder = _video_decoders.end ();
 185         _sndfile_decoders.clear ();
 186
 187         if (_video) {
 188                 list<shared_ptr<const VideoContent> > vc = _playlist->video ();
 189                 for (list<shared_ptr<const VideoContent> >::iterator i = vc.begin(); i != vc.end(); ++i) {
 190
 191                         shared_ptr<VideoDecoder> d;
 192
 193                         /* XXX: into content? */
 194
 195                         shared_ptr<const FFmpegContent> fc = dynamic_pointer_cast<const FFmpegContent> (*i);
 196                         if (fc) {
 197                                 shared_ptr<FFmpegDecoder> fd (
 198                                         new FFmpegDecoder (
 199                                                 _film, fc, _video,
 200                                                 _audio && _playlist->audio_from() == Playlist::AUDIO_FFMPEG,
 201                                                 _subtitles,
 202                                                 _video_sync
 203                                                 )
 204                                         );
 205
 206                                 if (_playlist->audio_from() == Playlist::AUDIO_FFMPEG) {
 207                                         fd->Audio.connect (bind (&Player::process_audio, this, fc, _1));
 208                                 }
 209
 210                                 d = fd;
 211                         }
 212
 213                         shared_ptr<const ImageMagickContent> ic = dynamic_pointer_cast<const ImageMagickContent> (*i);
 214                         if (ic) {
 215                                 d.reset (new ImageMagickDecoder (_film, ic));
 216                         }
 217
 218                         d->connect_video (shared_from_this ());
 219                         _video_decoders.push_back (d);
 220                 }
 221
 222                 _video_decoder = _video_decoders.begin ();
 223         }
 224
 225         if (_audio && _playlist->audio_from() == Playlist::AUDIO_SNDFILE) {
 226                 list<shared_ptr<const SndfileContent> > sc = _playlist->sndfile ();
 227                 for (list<shared_ptr<const SndfileContent> >::iterator i = sc.begin(); i != sc.end(); ++i) {
 228                         shared_ptr<SndfileDecoder> d (new SndfileDecoder (_film, *i));
 229                         _sndfile_decoders.push_back (d);
 230                         d->Audio.connect (bind (&Player::process_audio, this, *i, _1));
 231                 }
 232         }
 233 }
 234
 235 void
 236 Player::disable_video_sync ()
 237 {
 238         _video_sync = false;
 239 }
 240
 241 double
 242 Player::last_video_time () const
 243 {
 244         double t = 0;
 245         for (list<shared_ptr<VideoDecoder> >::const_iterator i = _video_decoders.begin(); i != _video_decoder; ++i) {
 246                 t += (*i)->video_length() / (*i)->video_frame_rate ();
 247         }
 248
 249         return t + (*_video_decoder)->last_content_time ();
 250 }
 251
 252 void
 253 Player::content_changed (weak_ptr<Content> w, int p)
 254 {
 255         shared_ptr<Content> c = w.lock ();
 256         if (!c) {
 257                 return;
 258         }
 259
 260         if (p == VideoContentProperty::VIDEO_LENGTH) {
 261                 if (dynamic_pointer_cast<FFmpegContent> (c)) {
 262                         /* FFmpeg content length changes are serious; we need new decoders */
 263                         _have_valid_decoders = false;
 264                 }
 265         }
 266 }
 267
 268 void
 269 Player::playlist_changed ()
 270 {
 271         _have_valid_decoders = false;
 272 }