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/*
Copyright (C) 2012-2021 Carl Hetherington <cth@carlh.net>
This file is part of DCP-o-matic.
DCP-o-matic is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
DCP-o-matic is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with DCP-o-matic. If not, see <http://www.gnu.org/licenses/>.
*/
#include "compose.hpp"
#include "frame_interval_checker.h"
#include "image.h"
#include "j2k_image_proxy.h"
#include "log.h"
#include "raw_image_proxy.h"
#include "video_decoder.h"
#include <iostream>
#include "i18n.h"
using std::cout;
using std::dynamic_pointer_cast;
using std::shared_ptr;
using namespace dcpomatic;
VideoDecoder::VideoDecoder (Decoder* parent, shared_ptr<const Content> c)
: DecoderPart (parent)
, _content (c)
, _frame_interval_checker (new FrameIntervalChecker())
{
}
/** Called by decoder classes when they have a video frame ready */
void
VideoDecoder::emit(shared_ptr<const Film> film, shared_ptr<const ImageProxy> image, ContentTime time)
{
if (ignore ()) {
return;
}
auto const afr = _content->active_video_frame_rate(film);
auto const vft = _content->video->frame_type();
/* Do some heuristics to try and spot the case where the user sets content to 3D
* when it is not. We try to tell this by looking at the differences in time between
* the first few frames. Real 3D content should have two frames for each timestamp.
*/
if (_frame_interval_checker) {
_frame_interval_checker->feed(time, afr);
if (_frame_interval_checker->guess() == FrameIntervalChecker::PROBABLY_NOT_3D && vft == VideoFrameType::THREE_D) {
boost::throw_exception (
DecodeError(
String::compose(
_("The content file %1 is set as 3D but does not appear to contain 3D images. Please set it to 2D. "
"You can still make a 3D DCP from this content by ticking the 3D option in the DCP video tab."),
_content->path(0)
)
)
);
}
if (_frame_interval_checker->guess() != FrameIntervalChecker::AGAIN) {
_frame_interval_checker.reset ();
}
}
switch (vft) {
case VideoFrameType::TWO_D:
Data(ContentVideo(image, time, Eyes::BOTH, Part::WHOLE));
break;
case VideoFrameType::THREE_D:
{
auto eyes = Eyes::LEFT;
auto j2k = dynamic_pointer_cast<const J2KImageProxy>(image);
if (j2k && j2k->eye()) {
eyes = *j2k->eye() == dcp::Eye::LEFT ? Eyes::LEFT : Eyes::RIGHT;
}
Data(ContentVideo(image, time, eyes, Part::WHOLE));
break;
}
case VideoFrameType::THREE_D_ALTERNATE:
{
Eyes eyes;
if (_last_emitted_eyes) {
eyes = _last_emitted_eyes.get() == Eyes::LEFT ? Eyes::RIGHT : Eyes::LEFT;
} else {
/* We don't know what eye this frame is, so just guess */
auto frame = time.frames_round(_content->video_frame_rate().get_value_or(24));
eyes = (frame % 2) ? Eyes::RIGHT : Eyes::LEFT;
}
Data(ContentVideo(image, time, eyes, Part::WHOLE));
_last_emitted_eyes = eyes;
break;
}
case VideoFrameType::THREE_D_LEFT_RIGHT:
Data(ContentVideo(image, time, Eyes::LEFT, Part::LEFT_HALF));
Data(ContentVideo(image, time, Eyes::RIGHT, Part::RIGHT_HALF));
break;
case VideoFrameType::THREE_D_TOP_BOTTOM:
Data(ContentVideo(image, time, Eyes::LEFT, Part::TOP_HALF));
Data(ContentVideo(image, time, Eyes::RIGHT, Part::BOTTOM_HALF));
break;
case VideoFrameType::THREE_D_LEFT:
Data(ContentVideo(image, time, Eyes::LEFT, Part::WHOLE));
break;
case VideoFrameType::THREE_D_RIGHT:
Data(ContentVideo(image, time, Eyes::RIGHT, Part::WHOLE));
break;
default:
DCPOMATIC_ASSERT (false);
}
_position = time;
}
void
VideoDecoder::seek ()
{
_position = boost::none;
_last_emitted_eyes.reset ();
_frame_interval_checker.reset (new FrameIntervalChecker());
}
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