2 Copyright (C) 2013-2021 Carl Hetherington <cth@carlh.net>
4 This file is part of DCP-o-matic.
6 DCP-o-matic is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 DCP-o-matic is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with DCP-o-matic. If not, see <http://www.gnu.org/licenses/>.
22 #include "audio_content.h"
26 #include "video_content.h"
29 using std::shared_ptr;
30 using namespace dcpomatic;
33 Piece::Piece (shared_ptr<Content> c, shared_ptr<Decoder> d, FrameRateChange f)
39 for (auto j: content->audio->streams()) {
40 _stream_last_push_end[j] = content->position();
48 Piece::update_pull_to (DCPTime& pull_to) const
54 for (auto const& i: _stream_last_push_end) {
55 pull_to = std::min(pull_to, i.second);
61 Piece::set_last_push_end (AudioStreamPtr stream, DCPTime end)
63 DCPOMATIC_ASSERT (_stream_last_push_end.find(stream) != _stream_last_push_end.end());
64 _stream_last_push_end[stream] = end;
69 Piece::content_video_to_dcp (Frame f) const
71 /* See comment in resampled_audio_to_dcp */
72 auto const d = DCPTime::from_frames(f * frc.factor(), frc.dcp) - DCPTime(content->trim_start(), frc);
73 return d + content->position();
78 Piece::resampled_audio_to_dcp (Frame f, shared_ptr<const Film> film) const
80 /* It might seem more logical here to convert s to a ContentTime (using the FrameRateChange)
81 then convert that ContentTime to frames at the content's rate. However this fails for
82 situations like content at 29.9978733fps, DCP at 30fps. The accuracy of the Time type is not
83 enough to distinguish between the two with low values of time (e.g. 3200 in Time units).
85 Instead we convert the DCPTime using the DCP video rate then account for any skip/repeat.
87 return DCPTime::from_frames(f, film->audio_frame_rate())
88 - DCPTime(content->trim_start(), frc)
89 + content->position();
94 Piece::dcp_to_content_time (DCPTime t, shared_ptr<const Film> film) const
96 auto s = t - content->position ();
97 s = min (content->length_after_trim(film), s);
98 return max (ContentTime(), ContentTime(s, frc) + content->trim_start());
103 Piece::content_time_to_dcp (ContentTime t) const
105 return max (DCPTime(), DCPTime(t - content->trim_start(), frc) + content->position());
110 Piece::use_video () const
112 return content->video && content->video->use();
117 Piece::position () const
119 return content->position ();