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/*
Copyright (C) 2012-2018 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 "video_decoder.h"
#include "image.h"
#include "raw_image_proxy.h"
#include "film.h"
#include "log.h"
#include "compose.hpp"
#include <boost/foreach.hpp>
#include <iostream>
#include "i18n.h"
using std::cout;
using std::list;
using std::max;
using std::back_inserter;
using boost::shared_ptr;
using boost::optional;
using namespace dcpomatic;
VideoDecoder::VideoDecoder (Decoder* parent, shared_ptr<const Content> c)
: DecoderPart (parent)
, _content (c)
{
}
/** Called by decoder classes when they have a video frame ready.
* @param frame Frame index within the content; this does not take into account 3D
* so for 3D_ALTERNATE this value goes:
* 0: frame 0 left
* 1: frame 0 right
* 2: frame 1 left
* 3: frame 1 right
* and so on.
*/
void
VideoDecoder::emit (shared_ptr<const Film> film, shared_ptr<const ImageProxy> image, Frame decoder_frame)
{
if (ignore ()) {
return;
}
double const afr = _content->active_video_frame_rate(film);
Frame frame;
if (!_position) {
/* This is the first data we have received since initialisation or seek. Set
the position based on the frame that was given. After this first time
we just cound frames, since (as with audio) it seems that ContentTimes
are unreliable from FFmpegDecoder. They are much better than audio times
but still we get the occasional one which is duplicated. In this case
ffmpeg seems to carry on regardless, processing the video frame as normal.
If we drop the frame with the duplicated timestamp we obviously lose sync.
*/
_position = ContentTime::from_frames (decoder_frame, afr);
if (_content->video->frame_type() == VIDEO_FRAME_TYPE_3D_ALTERNATE) {
frame = decoder_frame / 2;
_last_emitted_eyes = EYES_RIGHT;
} else {
frame = decoder_frame;
}
} else {
if (_content->video->frame_type() == VIDEO_FRAME_TYPE_3D_ALTERNATE) {
DCPOMATIC_ASSERT (_last_emitted_eyes);
if (_last_emitted_eyes.get() == EYES_RIGHT) {
frame = _position->frames_round(afr) + 1;
} else {
frame = _position->frames_round(afr);
}
} else {
frame = _position->frames_round(afr) + 1;
}
}
switch (_content->video->frame_type ()) {
case VIDEO_FRAME_TYPE_2D:
Data (ContentVideo (image, frame, EYES_BOTH, PART_WHOLE));
break;
case VIDEO_FRAME_TYPE_3D:
{
/* We should receive the same frame index twice for 3D; hence we know which
frame this one is.
*/
bool const same = (_last_emitted_frame && _last_emitted_frame.get() == frame);
if (!same && _last_emitted_eyes && *_last_emitted_eyes == EYES_LEFT) {
/* We just got a new frame index but the last frame was left-eye; it looks like
this content is not really 3D.
*/
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)
)
)
);
}
Eyes const eyes = same ? EYES_RIGHT : EYES_LEFT;
Data (ContentVideo (image, frame, eyes, PART_WHOLE));
_last_emitted_frame = frame;
_last_emitted_eyes = eyes;
break;
}
case VIDEO_FRAME_TYPE_3D_ALTERNATE:
{
DCPOMATIC_ASSERT (_last_emitted_eyes);
Eyes const eyes = _last_emitted_eyes.get() == EYES_LEFT ? EYES_RIGHT : EYES_LEFT;
Data (ContentVideo (image, frame, eyes, PART_WHOLE));
_last_emitted_eyes = eyes;
break;
}
case VIDEO_FRAME_TYPE_3D_LEFT_RIGHT:
Data (ContentVideo (image, frame, EYES_LEFT, PART_LEFT_HALF));
Data (ContentVideo (image, frame, EYES_RIGHT, PART_RIGHT_HALF));
break;
case VIDEO_FRAME_TYPE_3D_TOP_BOTTOM:
Data (ContentVideo (image, frame, EYES_LEFT, PART_TOP_HALF));
Data (ContentVideo (image, frame, EYES_RIGHT, PART_BOTTOM_HALF));
break;
case VIDEO_FRAME_TYPE_3D_LEFT:
Data (ContentVideo (image, frame, EYES_LEFT, PART_WHOLE));
break;
case VIDEO_FRAME_TYPE_3D_RIGHT:
Data (ContentVideo (image, frame, EYES_RIGHT, PART_WHOLE));
break;
default:
DCPOMATIC_ASSERT (false);
}
_position = ContentTime::from_frames (frame, afr);
}
void
VideoDecoder::seek ()
{
_position = boost::optional<ContentTime>();
_last_emitted_frame.reset ();
_last_emitted_eyes.reset ();
}
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