2 Copyright (C) 2012-2018 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/>.
21 #include "video_decoder.h"
23 #include "raw_image_proxy.h"
26 #include "compose.hpp"
27 #include <boost/foreach.hpp>
35 using std::back_inserter;
36 using boost::shared_ptr;
37 using boost::optional;
39 VideoDecoder::VideoDecoder (Decoder* parent, shared_ptr<const Content> c)
40 : DecoderPart (parent)
46 /** Called by decoder classes when they have a video frame ready.
47 * @param frame Frame index within the content; this does not take into account 3D
48 * so for 3D_ALTERNATE this value goes:
56 VideoDecoder::emit (shared_ptr<const Film> film, shared_ptr<const ImageProxy> image, Frame decoder_frame)
62 double const afr = _content->active_video_frame_rate(film);
66 /* This is the first data we have received since initialisation or seek. Set
67 the position based on the frame that was given. After this first time
68 we just cound frames, since (as with audio) it seems that ContentTimes
69 are unreliable from FFmpegDecoder. They are much better than audio times
70 but still we get the occasional one which is duplicated. In this case
71 ffmpeg seems to carry on regardless, processing the video frame as normal.
72 If we drop the frame with the duplicated timestamp we obviously lose sync.
74 _position = ContentTime::from_frames (decoder_frame, afr);
75 if (_content->video->frame_type() == VIDEO_FRAME_TYPE_3D_ALTERNATE) {
76 frame = decoder_frame / 2;
77 _last_emitted_eyes = EYES_RIGHT;
79 frame = decoder_frame;
82 if (_content->video->frame_type() == VIDEO_FRAME_TYPE_3D_ALTERNATE) {
83 DCPOMATIC_ASSERT (_last_emitted_eyes);
84 if (_last_emitted_eyes.get() == EYES_RIGHT) {
85 frame = _position->frames_round(afr) + 1;
87 frame = _position->frames_round(afr);
90 frame = _position->frames_round(afr) + 1;
94 switch (_content->video->frame_type ()) {
95 case VIDEO_FRAME_TYPE_2D:
96 Data (ContentVideo (image, frame, EYES_BOTH, PART_WHOLE));
98 case VIDEO_FRAME_TYPE_3D:
100 /* We should receive the same frame index twice for 3D; hence we know which
103 bool const same = (_last_emitted_frame && _last_emitted_frame.get() == frame);
104 if (!same && _last_emitted_eyes && *_last_emitted_eyes == EYES_LEFT) {
105 /* We just got a new frame index but the last frame was left-eye; it looks like
106 this content is not really 3D.
108 boost::throw_exception (
111 _("The content file %1 is set as 3D but does not appear to contain 3D images. Please set it to 2D. "
112 "You can still make a 3D DCP from this content by ticking the 3D option in the DCP video tab."),
118 Eyes const eyes = same ? EYES_RIGHT : EYES_LEFT;
119 Data (ContentVideo (image, frame, eyes, PART_WHOLE));
120 _last_emitted_frame = frame;
121 _last_emitted_eyes = eyes;
124 case VIDEO_FRAME_TYPE_3D_ALTERNATE:
126 DCPOMATIC_ASSERT (_last_emitted_eyes);
127 Eyes const eyes = _last_emitted_eyes.get() == EYES_LEFT ? EYES_RIGHT : EYES_LEFT;
128 Data (ContentVideo (image, frame, eyes, PART_WHOLE));
129 _last_emitted_eyes = eyes;
132 case VIDEO_FRAME_TYPE_3D_LEFT_RIGHT:
133 Data (ContentVideo (image, frame, EYES_LEFT, PART_LEFT_HALF));
134 Data (ContentVideo (image, frame, EYES_RIGHT, PART_RIGHT_HALF));
136 case VIDEO_FRAME_TYPE_3D_TOP_BOTTOM:
137 Data (ContentVideo (image, frame, EYES_LEFT, PART_TOP_HALF));
138 Data (ContentVideo (image, frame, EYES_RIGHT, PART_BOTTOM_HALF));
140 case VIDEO_FRAME_TYPE_3D_LEFT:
141 Data (ContentVideo (image, frame, EYES_LEFT, PART_WHOLE));
143 case VIDEO_FRAME_TYPE_3D_RIGHT:
144 Data (ContentVideo (image, frame, EYES_RIGHT, PART_WHOLE));
147 DCPOMATIC_ASSERT (false);
150 _position = ContentTime::from_frames (frame, afr);
154 VideoDecoder::seek ()
156 _position = boost::none;
157 _last_emitted_frame.reset ();
158 _last_emitted_eyes.reset ();