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/*
Copyright (C) 2024 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 "fcpxml_content.h"
#include "fcpxml_decoder.h"
#include "ffmpeg_image_proxy.h"
#include "guess_crop.h"
#include "image.h"
#include "rect.h"
#include "text_decoder.h"
#include <dcp/array_data.h>
using std::make_shared;
using std::shared_ptr;
using std::weak_ptr;
FCPXMLDecoder::FCPXMLDecoder(weak_ptr<const Film> film, shared_ptr<const FCPXMLContent> content)
: Decoder(film)
, _fcpxml_content(content)
, _sequence(dcpomatic::fcpxml::load(content->path(0)))
{
text.push_back(make_shared<TextDecoder>(this, content->only_text()));
update_position();
}
bool
FCPXMLDecoder::pass()
{
if (_next >= static_cast<int>(_sequence.video.size())) {
return true;
}
auto const png_data = dcp::ArrayData(_sequence.parent / _sequence.video[_next].source);
auto const full_image = FFmpegImageProxy(png_data).image(Image::Alignment::PADDED).image;
auto const crop = guess_crop_by_alpha(full_image);
auto const cropped_image = full_image->crop(crop);
auto rectangle = dcpomatic::Rect<double>{
static_cast<double>(crop.left) / full_image->size().width,
static_cast<double>(crop.top) / full_image->size().height,
static_cast<double>(cropped_image->size().width) / full_image->size().width,
static_cast<double>(cropped_image->size().height) / full_image->size().height
};
only_text()->emit_bitmap(_sequence.video[_next].period, cropped_image, rectangle);
++_next;
update_position();
return false;
}
void
FCPXMLDecoder::seek(dcpomatic::ContentTime time, bool accurate)
{
/* It's worth back-tracking a little here as decoding is cheap and it's nice if we don't miss
too many subtitles when seeking.
*/
time -= dcpomatic::ContentTime::from_seconds(5);
if (time < dcpomatic::ContentTime()) {
time = {};
}
Decoder::seek(time, accurate);
_next = 0;
while (_next < static_cast<int>(_sequence.video.size()) && _sequence.video[_next].period.from < time) {
++_next;
}
update_position();
}
void
FCPXMLDecoder::update_position()
{
if (_next < static_cast<int>(_sequence.video.size())) {
only_text()->maybe_set_position(_sequence.video[_next].period.from);
}
}
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