21944c5fc6ad63aee373b451deac690f49a10bf7
[dcpomatic.git] / src / lib / transcoder.cc
1 /*
2     Copyright (C) 2012 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 /** @file  src/transcoder.cc
21  *  @brief A class which takes a Film and some Options, then uses those to transcode the film.
22  *
23  *  A decoder is selected according to the content type, and the encoder can be specified
24  *  as a parameter to the constructor.
25  */
26
27 #include <iostream>
28 #include <boost/signals2.hpp>
29 #include "transcoder.h"
30 #include "encoder.h"
31 #include "film.h"
32 #include "matcher.h"
33 #include "delay_line.h"
34 #include "gain.h"
35 #include "video_decoder.h"
36 #include "audio_decoder.h"
37 #include "playlist.h"
38
39 using std::string;
40 using boost::shared_ptr;
41 using boost::dynamic_pointer_cast;
42
43 /** Construct a transcoder using a Decoder that we create and a supplied Encoder.
44  *  @param f Film that we are transcoding.
45  *  @param j Job that we are running under, or 0.
46  *  @param e Encoder to use.
47  */
48 Transcoder::Transcoder (shared_ptr<Film> f, shared_ptr<Job> j)
49         : _job (j)
50         , _playlist (f->playlist ())
51         , _encoder (new Encoder (f, _playlist))
52 {
53         if (_playlist->has_audio ()) {
54                 _matcher.reset (new Matcher (f->log(), _playlist->audio_frame_rate(), _playlist->video_frame_rate()));
55                 _delay_line.reset (new DelayLine (f->log(), _playlist->audio_channels(), f->audio_delay() * _playlist->audio_frame_rate() / 1000));
56                 _gain.reset (new Gain (f->log(), f->audio_gain()));
57         }
58
59         if (_matcher) {
60                 _playlist->connect_video (_matcher);
61                 _matcher->connect_video (_encoder);
62         } else {
63                 _playlist->connect_video (_encoder);
64         }
65         
66         if (_matcher && _delay_line && _playlist->has_audio ()) {
67                 _playlist->connect_audio (_delay_line);
68                 _delay_line->connect_audio (_matcher);
69                 _matcher->connect_audio (_gain);
70                 _gain->connect_audio (_encoder);
71         }
72 }
73
74 void
75 Transcoder::go ()
76 {
77         _encoder->process_begin ();
78         try {
79                 while (1) {
80                         if (_playlist->pass ()) {
81                                 break;
82                         }
83                         _playlist->set_progress (_job);
84                 }
85                 
86         } catch (...) {
87                 _encoder->process_end ();
88                 throw;
89         }
90         
91         if (_delay_line) {
92                 _delay_line->process_end ();
93         }
94         if (_matcher) {
95                 _matcher->process_end ();
96         }
97         if (_gain) {
98                 _gain->process_end ();
99         }
100         _encoder->process_end ();
101 }