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/*
Copyright (C) 2012-2014 Carl Hetherington <cth@carlh.net>
This program 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.
This program 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 this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "video_decoder.h"
#include "image.h"
#include "image_proxy.h"
#include "content_video.h"
#include "i18n.h"
using std::cout;
using std::list;
using std::max;
using boost::shared_ptr;
using boost::optional;
VideoDecoder::VideoDecoder (shared_ptr<const VideoContent> c)
#ifdef DCPOMATIC_DEBUG
: test_gaps (0)
, _video_content (c)
#else
: _video_content (c)
#endif
, _same (false)
{
}
list<ContentVideo>
VideoDecoder::decoded_video (VideoFrame frame)
{
list<ContentVideo> output;
for (list<ContentVideo>::const_iterator i = _decoded_video.begin(); i != _decoded_video.end(); ++i) {
if (i->frame == frame) {
output.push_back (*i);
}
}
return output;
}
/** Get all frames which exist in the content at a given frame index.
* @param frame Frame index.
* @param accurate true to try hard to return frames at the precise time that was requested, otherwise frames nearby may be returned.
* @return Frames; there may be none (if there is no video there), 1 for 2D or 2 for 3D.
*/
list<ContentVideo>
VideoDecoder::get_video (VideoFrame frame, bool accurate)
{
/* At this stage, if we have get_video()ed before, _decoded_video will contain the last frame that this
method returned (and possibly a few more). If the requested frame is not in _decoded_video and it is not the next
one after the end of _decoded_video we need to seek.
*/
if (_decoded_video.empty() || frame < _decoded_video.front().frame || frame > (_decoded_video.back().frame + 1)) {
seek (ContentTime::from_frames (frame, _video_content->video_frame_rate()), accurate);
}
list<ContentVideo> dec;
/* Now enough pass() calls should either:
* (a) give us what we want, or
* (b) give us something after what we want, indicating that we will never get what we want, or
* (c) hit the end of the decoder.
*/
if (accurate) {
/* We are being accurate, so we want the right frame.
* This could all be one statement but it's split up for clarity.
*/
while (true) {
if (!decoded_video(frame).empty ()) {
/* We got what we want */
break;
}
if (pass ()) {
/* The decoder has nothing more for us */
break;
}
if (!_decoded_video.empty() && _decoded_video.front().frame > frame) {
/* We're never going to get the frame we want. Perhaps the caller is asking
* for a video frame before the content's video starts (if its audio
* begins before its video, for example).
*/
break;
}
}
dec = decoded_video (frame);
} else {
/* Any frame will do: use the first one that comes out of pass() */
while (_decoded_video.empty() && !pass ()) {}
if (!_decoded_video.empty ()) {
dec.push_back (_decoded_video.front ());
}
}
/* Clean up _decoded_video; keep the frame we are returning, but nothing before that */
while (!_decoded_video.empty() && _decoded_video.front().frame < dec.front().frame) {
_decoded_video.pop_front ();
}
return dec;
}
/** Called by subclasses when they have a video frame ready */
void
VideoDecoder::video (shared_ptr<const ImageProxy> image, VideoFrame frame)
{
/* We may receive the same frame index twice for 3D, and we need to know
when that happens.
*/
_same = (!_decoded_video.empty() && frame == _decoded_video.back().frame);
/* Fill in gaps */
/* XXX: 3D */
while (!_decoded_video.empty () && (_decoded_video.back().frame + 1) < frame) {
#ifdef DCPOMATIC_DEBUG
test_gaps++;
#endif
_decoded_video.push_back (
ContentVideo (
_decoded_video.back().image,
_decoded_video.back().eyes,
_decoded_video.back().part,
_decoded_video.back().frame + 1
)
);
}
switch (_video_content->video_frame_type ()) {
case VIDEO_FRAME_TYPE_2D:
_decoded_video.push_back (ContentVideo (image, EYES_BOTH, PART_WHOLE, frame));
break;
case VIDEO_FRAME_TYPE_3D_ALTERNATE:
_decoded_video.push_back (ContentVideo (image, _same ? EYES_RIGHT : EYES_LEFT, PART_WHOLE, frame));
break;
case VIDEO_FRAME_TYPE_3D_LEFT_RIGHT:
_decoded_video.push_back (ContentVideo (image, EYES_LEFT, PART_LEFT_HALF, frame));
_decoded_video.push_back (ContentVideo (image, EYES_RIGHT, PART_RIGHT_HALF, frame));
break;
case VIDEO_FRAME_TYPE_3D_TOP_BOTTOM:
_decoded_video.push_back (ContentVideo (image, EYES_LEFT, PART_TOP_HALF, frame));
_decoded_video.push_back (ContentVideo (image, EYES_RIGHT, PART_BOTTOM_HALF, frame));
break;
case VIDEO_FRAME_TYPE_3D_LEFT:
_decoded_video.push_back (ContentVideo (image, EYES_LEFT, PART_WHOLE, frame));
break;
case VIDEO_FRAME_TYPE_3D_RIGHT:
_decoded_video.push_back (ContentVideo (image, EYES_RIGHT, PART_WHOLE, frame));
break;
default:
assert (false);
}
}
void
VideoDecoder::seek (ContentTime, bool)
{
_decoded_video.clear ();
}
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