Add unfinished timing tab; fix crash on reconstruction of timeline; fix lack of black...
[dcpomatic.git] / 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 #include "image.h"
31 #include "null_content.h"
32 #include "black_decoder.h"
33 #include "silence_decoder.h"
34
35 using std::list;
36 using std::cout;
37 using std::min;
38 using std::max;
39 using std::vector;
40 using boost::shared_ptr;
41 using boost::weak_ptr;
42 using boost::dynamic_pointer_cast;
43
44 struct Piece
45 {
46         Piece (shared_ptr<Content> c, shared_ptr<Decoder> d)
47                 : content (c)
48                 , decoder (d)
49         {}
50         
51         shared_ptr<Content> content;
52         shared_ptr<Decoder> decoder;
53 };
54
55 Player::Player (shared_ptr<const Film> f, shared_ptr<const Playlist> p)
56         : _film (f)
57         , _playlist (p)
58         , _video (true)
59         , _audio (true)
60         , _subtitles (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 void
83 Player::disable_subtitles ()
84 {
85         _subtitles = false;
86 }
87
88 bool
89 Player::pass ()
90 {
91         if (!_have_valid_pieces) {
92                 setup_pieces ();
93                 _have_valid_pieces = true;
94         }
95
96         /* Here we are just finding the active decoder with the earliest last emission time, then
97            calling pass on it.
98         */
99
100         Time earliest_t = TIME_MAX;
101         shared_ptr<Piece> earliest;
102
103         for (list<shared_ptr<Piece> >::iterator i = _pieces.begin(); i != _pieces.end(); ++i) {
104 //              cout << "check " << (*i)->content->file() << " start=" << (*i)->content->start() << ", next=" << (*i)->decoder->next() << ", end=" << (*i)->content->end() << "\n";
105                 if (((*i)->decoder->next() + (*i)->content->start()) >= (*i)->content->end()) {
106                         continue;
107                 }
108
109                 if (!_audio && dynamic_pointer_cast<AudioDecoder> ((*i)->decoder) && !dynamic_pointer_cast<VideoDecoder> ((*i)->decoder)) {
110                         continue;
111                 }
112                 
113                 Time const t = (*i)->content->start() + (*i)->decoder->next();
114                 if (t < earliest_t) {
115 //                      cout << "\t candidate; " << t << " " << (t / TIME_HZ) << ".\n";
116                         earliest_t = t;
117                         earliest = *i;
118                 }
119         }
120
121         if (!earliest) {
122                 return true;
123         }
124
125         cout << "PASS:\n";
126         cout << "\tpass " << earliest->content->file() << " ";
127         if (dynamic_pointer_cast<FFmpegContent> (earliest->content)) {
128                 cout << " FFmpeg.\n";
129         } else if (dynamic_pointer_cast<ImageMagickContent> (earliest->content)) {
130                 cout << " ImageMagickContent.\n";
131         } else if (dynamic_pointer_cast<SndfileContent> (earliest->content)) {
132                 cout << " SndfileContent.\n";
133         } else if (dynamic_pointer_cast<BlackDecoder> (earliest->decoder)) {
134                 cout << " Black.\n";
135         } else if (dynamic_pointer_cast<SilenceDecoder> (earliest->decoder)) {
136                 cout << " Silence.\n";
137         }
138         
139         earliest->decoder->pass ();
140         _position = earliest->content->start() + earliest->decoder->next ();
141         cout << "\tpassed to " << _position << " " << (_position / TIME_HZ) << "\n";
142
143         return false;
144 }
145
146 void
147 Player::process_video (weak_ptr<Content> weak_content, shared_ptr<const Image> image, bool same, shared_ptr<Subtitle> sub, Time time)
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.get(), 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 void
234 Player::add_black_piece (Time s, Time len)
235 {
236         shared_ptr<NullContent> nc (new NullContent (_film, s, len));
237         shared_ptr<BlackDecoder> bd (new BlackDecoder (_film, nc));
238         bd->Video.connect (bind (&Player::process_video, this, nc, _1, _2, _3, _4));
239         _pieces.push_back (shared_ptr<Piece> (new Piece (nc, bd)));
240         cout << "\tblack @ " << s << " -- " << (s + len) << "\n";
241 }
242
243 void
244 Player::add_silent_piece (Time s, Time len)
245 {
246         shared_ptr<NullContent> nc (new NullContent (_film, s, len));
247         shared_ptr<SilenceDecoder> sd (new SilenceDecoder (_film, nc));
248         sd->Audio.connect (bind (&Player::process_audio, this, nc, _1, _2));
249         _pieces.push_back (shared_ptr<Piece> (new Piece (nc, sd)));
250         cout << "\tsilence @ " << s << " -- " << (s + len) << "\n";
251 }
252
253
254 struct ContentSorter
255 {
256         bool operator() (shared_ptr<Content> a, shared_ptr<Content> b)
257         {
258                 return a->start() < b->start();
259         }
260 };
261
262 void
263 Player::setup_pieces ()
264 {
265         cout << "----- Player SETUP PIECES.\n";
266
267         list<shared_ptr<Piece> > old_pieces = _pieces;
268
269         _pieces.clear ();
270
271         Playlist::ContentList content = _playlist->content ();
272         sort (content.begin(), content.end(), ContentSorter ());
273         
274         for (Playlist::ContentList::iterator i = content.begin(); i != content.end(); ++i) {
275
276                 shared_ptr<Decoder> decoder;
277                 
278                 /* XXX: into content? */
279
280                 shared_ptr<const FFmpegContent> fc = dynamic_pointer_cast<const FFmpegContent> (*i);
281                 if (fc) {
282                         shared_ptr<FFmpegDecoder> fd (new FFmpegDecoder (_film, fc, _video, _audio, _subtitles));
283                         
284                         fd->Video.connect (bind (&Player::process_video, this, *i, _1, _2, _3, _4));
285                         fd->Audio.connect (bind (&Player::process_audio, this, *i, _1, _2));
286
287                         decoder = fd;
288                         cout << "\tFFmpeg @ " << fc->start() << " -- " << fc->end() << "\n";
289                 }
290                 
291                 shared_ptr<const ImageMagickContent> ic = dynamic_pointer_cast<const ImageMagickContent> (*i);
292                 if (ic) {
293                         shared_ptr<ImageMagickDecoder> id;
294                         
295                         /* See if we can re-use an old ImageMagickDecoder */
296                         for (list<shared_ptr<Piece> >::const_iterator j = old_pieces.begin(); j != old_pieces.end(); ++j) {
297                                 shared_ptr<ImageMagickDecoder> imd = dynamic_pointer_cast<ImageMagickDecoder> ((*j)->decoder);
298                                 if (imd && imd->content() == ic) {
299                                         id = imd;
300                                 }
301                         }
302
303                         if (!id) {
304                                 id.reset (new ImageMagickDecoder (_film, ic));
305                                 id->Video.connect (bind (&Player::process_video, this, *i, _1, _2, _3, _4));
306                         }
307
308                         decoder = id;
309                         cout << "\tImageMagick @ " << ic->start() << " -- " << ic->end() << "\n";
310                 }
311
312                 shared_ptr<const SndfileContent> sc = dynamic_pointer_cast<const SndfileContent> (*i);
313                 if (sc) {
314                         shared_ptr<AudioDecoder> sd (new SndfileDecoder (_film, sc));
315                         sd->Audio.connect (bind (&Player::process_audio, this, *i, _1, _2));
316
317                         decoder = sd;
318                         cout << "\tSndfile @ " << sc->start() << " -- " << sc->end() << "\n";
319                 }
320
321                 _pieces.push_back (shared_ptr<Piece> (new Piece (*i, decoder)));
322         }
323
324         /* Fill in visual gaps with black and audio gaps with silence */
325
326         Time video_pos = 0;
327         Time audio_pos = 0;
328         list<shared_ptr<Piece> > pieces_copy = _pieces;
329         for (list<shared_ptr<Piece> >::iterator i = pieces_copy.begin(); i != pieces_copy.end(); ++i) {
330                 if (dynamic_pointer_cast<VideoContent> ((*i)->content)) {
331                         Time const diff = (*i)->content->start() - video_pos;
332                         if (diff > 0) {
333                                 add_black_piece (video_pos, diff);
334                         }
335                                                 
336                         video_pos = (*i)->content->end();
337                 } else {
338                         Time const diff = (*i)->content->start() - audio_pos;
339                         if (diff > 0) {
340                                 add_silent_piece (video_pos, diff);
341                         }
342                         audio_pos = (*i)->content->end();
343                 }
344         }
345
346         if (video_pos < audio_pos) {
347                 add_black_piece (video_pos, audio_pos - video_pos);
348         } else if (audio_pos < video_pos) {
349                 add_silent_piece (audio_pos, video_pos - audio_pos);
350         }
351 }
352
353 void
354 Player::content_changed (weak_ptr<Content> w, int p)
355 {
356         shared_ptr<Content> c = w.lock ();
357         if (!c) {
358                 return;
359         }
360
361         if (p == ContentProperty::START || p == VideoContentProperty::VIDEO_LENGTH) {
362                 _have_valid_pieces = false;
363         }
364 }
365
366 void
367 Player::playlist_changed ()
368 {
369         _have_valid_pieces = false;
370 }