/*
- Copyright (C) 2012-2018 Carl Hetherington <cth@carlh.net>
+ Copyright (C) 2012-2020 Carl Hetherington <cth@carlh.net>
This file is part of DCP-o-matic.
#include "raw_image_proxy.h"
#include "film.h"
#include "log.h"
+#include "frame_interval_checker.h"
#include "compose.hpp"
#include <boost/foreach.hpp>
#include <iostream>
VideoDecoder::VideoDecoder (Decoder* parent, shared_ptr<const Content> c)
: DecoderPart (parent)
, _content (c)
+ , _frame_interval_checker (new FrameIntervalChecker())
{
}
* and so on.
*/
void
-VideoDecoder::emit (shared_ptr<const Film> film, shared_ptr<const ImageProxy> image, Frame frame)
+VideoDecoder::emit (shared_ptr<const Film> film, shared_ptr<const ImageProxy> image, Frame decoder_frame)
{
if (ignore ()) {
return;
}
- 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.
- */
+ double const afr = _content->active_video_frame_rate(film);
+ VideoFrameType const vft = _content->video->frame_type();
+
+ ContentTime frame_time = ContentTime::from_frames (decoder_frame, afr);
+
+ /* 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 (frame_time, afr);
+ if (_frame_interval_checker->guess() == FrameIntervalChecker::PROBABLY_NOT_3D && vft == VIDEO_FRAME_TYPE_3D) {
boost::throw_exception (
DecodeError(
String::compose(
)
);
}
- Eyes const eyes = same ? EYES_RIGHT : EYES_LEFT;
+
+ if (_frame_interval_checker->guess() != FrameIntervalChecker::AGAIN) {
+ _frame_interval_checker.reset ();
+ }
+ }
+
+ Frame frame;
+ Eyes eyes = EYES_BOTH;
+ 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 (vft == VIDEO_FRAME_TYPE_3D_ALTERNATE) {
+ frame = decoder_frame / 2;
+ _last_emitted_eyes = EYES_RIGHT;
+ } else {
+ frame = decoder_frame;
+ }
+ } else {
+ if (vft == VIDEO_FRAME_TYPE_3D || vft == VIDEO_FRAME_TYPE_3D_ALTERNATE) {
+ DCPOMATIC_ASSERT (_last_emitted_eyes);
+ if (_last_emitted_eyes.get() == EYES_RIGHT) {
+ frame = _position->frames_round(afr) + 1;
+ eyes = EYES_LEFT;
+ } else {
+ frame = _position->frames_round(afr);
+ eyes = EYES_RIGHT;
+ }
+ } else {
+ frame = _position->frames_round(afr) + 1;
+ }
+ }
+
+ switch (vft) {
+ case VIDEO_FRAME_TYPE_2D:
+ Data (ContentVideo (image, frame, EYES_BOTH, PART_WHOLE));
+ break;
+ case VIDEO_FRAME_TYPE_3D:
+ {
Data (ContentVideo (image, frame, eyes, PART_WHOLE));
_last_emitted_frame = frame;
_last_emitted_eyes = eyes;
break;
}
case VIDEO_FRAME_TYPE_3D_ALTERNATE:
- Data (ContentVideo (image, frame / 2, (frame % 2) ? EYES_RIGHT : EYES_LEFT, PART_WHOLE));
- frame /= 2;
+ {
+ 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));
DCPOMATIC_ASSERT (false);
}
- _position = ContentTime::from_frames (frame, _content->active_video_frame_rate(film));
+ _position = ContentTime::from_frames (frame, afr);
}
void
VideoDecoder::seek ()
{
- _position = boost::optional<ContentTime>();
+ _position = boost::none;
_last_emitted_frame.reset ();
_last_emitted_eyes.reset ();
+ _frame_interval_checker.reset (new FrameIntervalChecker());
}