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/*
Copyright (C) 2014-2021 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 "dcp_subtitle_content.h"
#include "dcp_subtitle_decoder.h"
#include "film.h"
#include "font.h"
#include "text_content.h"
#include "util.h"
#include <dcp/interop_text_asset.h>
#include <dcp/load_font_node.h>
using std::dynamic_pointer_cast;
using std::list;
using std::make_shared;
using std::shared_ptr;
using std::string;
using std::vector;
using boost::optional;
using namespace dcpomatic;
DCPSubtitleDecoder::DCPSubtitleDecoder (shared_ptr<const Film> film, shared_ptr<const DCPSubtitleContent> content)
: Decoder (film)
{
/* Load the XML or MXF file */
_asset = load(content->path(0));
_asset->fix_empty_font_ids();
_subtitles = _asset->texts();
_next = _subtitles.begin ();
_subtitle_standard = _asset->subtitle_standard();
text.push_back (make_shared<TextDecoder>(this, content->only_text()));
update_position();
FontIDAllocator font_id_allocator;
for (auto node: _asset->load_font_nodes()) {
_font_id_allocator.add_font(0, _asset->id(), node->id);
}
_font_id_allocator.allocate();
}
void
DCPSubtitleDecoder::seek (ContentTime time, bool accurate)
{
Decoder::seek (time, accurate);
_next = _subtitles.begin ();
auto i = _subtitles.begin ();
while (i != _subtitles.end() && ContentTime::from_seconds ((*_next)->in().as_seconds()) < time) {
++i;
}
update_position();
}
bool
DCPSubtitleDecoder::pass ()
{
if (_next == _subtitles.end ()) {
return true;
}
/* Gather all subtitles with the same time period that are next
on the list. We must emit all subtitles for the same time
period with the same emit*() call otherwise the
TextDecoder will assume there is nothing else at the
time of emitting the first.
*/
vector<dcp::TextString> s;
vector<dcp::TextImage> i;
auto const p = content_time_period (*_next);
while (_next != _subtitles.end () && content_time_period (*_next) == p) {
auto ns = dynamic_pointer_cast<const dcp::TextString>(*_next);
if (ns) {
auto ns_copy = *ns;
if (ns_copy.font()) {
ns_copy.set_font(_font_id_allocator.font_id(0, _asset->id(), ns_copy.font().get()));
} else {
ns_copy.set_font(_font_id_allocator.default_font_id());
}
s.push_back(ns_copy);
++_next;
} else {
/* XXX: perhaps these image subs should also be collected together like the string ones are;
this would need to be done both here and in DCPDecoder.
*/
auto ni = dynamic_pointer_cast<const dcp::TextImage>(*_next);
if (ni) {
emit_subtitle_image (p, *ni, film()->frame_size(), only_text());
++_next;
}
}
}
only_text()->emit_plain(p, s, _subtitle_standard);
update_position();
return false;
}
ContentTimePeriod
DCPSubtitleDecoder::content_time_period(shared_ptr<const dcp::Text> s) const
{
return {
ContentTime::from_seconds(s->in().as_seconds()),
ContentTime::from_seconds(s->out().as_seconds())
};
}
/** @return time of first subtitle, if there is one */
optional<ContentTime>
DCPSubtitleDecoder::first () const
{
if (_subtitles.empty()) {
return {};
}
return ContentTime::from_seconds(_subtitles[0]->in().as_seconds());
}
void
DCPSubtitleDecoder::update_position()
{
if (_next != _subtitles.end()) {
only_text()->maybe_set_position(
ContentTime::from_seconds((*_next)->in().as_seconds())
);
}
}
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