2 Copyright (C) 2012 Carl Hetherington <cth@carlh.net>
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.
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.
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.
20 /** @file src/transcoder.cc
21 * @brief A class which takes a Film and some Options, then uses those to transcode the film.
23 * A decoder is selected according to the content type, and the encoder can be specified
24 * as a parameter to the constructor.
28 #include <boost/signals2.hpp>
29 #include "transcoder.h"
31 #include "decoder_factory.h"
34 #include "delay_line.h"
37 #include "video_decoder.h"
38 #include "audio_decoder.h"
42 using boost::shared_ptr;
43 using boost::dynamic_pointer_cast;
45 /** Construct a transcoder using a Decoder that we create and a supplied Encoder.
46 * @param f Film that we are transcoding.
47 * @param o Decode options.
48 * @param j Job that we are running under, or 0.
49 * @param e Encoder to use.
51 Transcoder::Transcoder (shared_ptr<Film> f, DecodeOptions o, Job* j, shared_ptr<Encoder> e)
54 , _decoders (decoder_factory (f, o))
58 shared_ptr<AudioStream> st = f->audio_stream();
59 if (st && st->sample_rate ()) {
60 _matcher.reset (new Matcher (f->log(), st->sample_rate(), f->source_frame_rate()));
62 _delay_line.reset (new DelayLine (f->log(), f->audio_delay() / 1000.0f));
63 _gain.reset (new Gain (f->log(), f->audio_gain()));
65 int const sr = st ? st->sample_rate() : 0;
66 int const trim_start = f->trim_type() == Film::ENCODE ? f->trim_start() : 0;
67 int const trim_end = f->trim_type() == Film::ENCODE ? f->trim_end() : 0;
68 _trimmer.reset (new Trimmer (
69 f->log(), trim_start, trim_end, f->length().get_value_or(0),
70 sr, f->source_frame_rate(), f->dcp_frame_rate()
73 /* Set up the decoder to use the film's set streams */
74 _decoders.video->set_subtitle_stream (f->subtitle_stream ());
75 if (f->audio_stream ()) {
76 _decoders.audio->set_audio_stream (f->audio_stream ());
79 _decoders.video->connect_video (_delay_line);
81 _delay_line->connect_video (_matcher);
82 _matcher->connect_video (_trimmer);
84 _delay_line->connect_video (_trimmer);
86 _trimmer->connect_video (_encoder);
88 _decoders.audio->connect_audio (_delay_line);
90 _delay_line->connect_audio (_matcher);
91 _matcher->connect_audio (_gain);
93 _delay_line->connect_audio (_gain);
95 _gain->connect_audio (_trimmer);
96 _trimmer->connect_audio (_encoder);
99 /** Run the decoder, passing its output to the encoder, until the decoder
100 * has no more data to present.
105 _encoder->process_begin ();
107 bool done[2] = { false, false };
111 done[0] = _decoders.video->pass ();
113 _decoders.video->set_progress (_job);
117 if (!done[1] && _decoders.audio && dynamic_pointer_cast<Decoder> (_decoders.audio) != dynamic_pointer_cast<Decoder> (_decoders.video)) {
118 done[1] = _decoders.audio->pass ();
123 if (done[0] && done[1]) {
128 _delay_line->process_end ();
130 _matcher->process_end ();
132 _gain->process_end ();
133 _encoder->process_end ();