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/*
Copyright (C) 2013-2014 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 <boost/shared_ptr.hpp>
#include "subtitle_decoder.h"
#include "subtitle_content.h"
using std::list;
using std::cout;
using boost::shared_ptr;
using boost::optional;
SubtitleDecoder::SubtitleDecoder (shared_ptr<const SubtitleContent> c)
: _subtitle_content (c)
{
}
/** Called by subclasses when an image subtitle is ready.
* Image may be 0 to say that there is no current subtitle.
*/
void
SubtitleDecoder::image_subtitle (ContentTimePeriod period, shared_ptr<Image> image, dcpomatic::Rect<double> rect)
{
_decoded_image_subtitles.push_back (shared_ptr<ContentImageSubtitle> (new ContentImageSubtitle (period, image, rect)));
}
void
SubtitleDecoder::text_subtitle (list<dcp::SubtitleString> s)
{
_decoded_text_subtitles.push_back (shared_ptr<ContentTextSubtitle> (new ContentTextSubtitle (s)));
}
template <class T>
list<shared_ptr<T> >
SubtitleDecoder::get (list<shared_ptr<T> > const & subs, ContentTimePeriod period)
{
if (!_subtitle_content->has_subtitle_during (period)) {
return list<shared_ptr<T> > ();
}
if (subs.empty() || period.from < subs.front()->period().from || period.to > (subs.back()->period().to + ContentTime::from_seconds (10))) {
/* Either we have no decoded data, or what we do have is a long way from what we want: seek */
seek (period.from, true);
}
/* Now enough pass() calls will either:
* (a) give us what we want, or
* (b) hit the end of the decoder.
*/
while (!pass() && (subs.empty() || (subs.front()->period().from > period.from || period.to < subs.back()->period().to))) {}
/* Now look for what we wanted in the data we have collected */
/* XXX: inefficient */
list<shared_ptr<T> > out;
for (typename list<shared_ptr<T> >::const_iterator i = subs.begin(); i != subs.end(); ++i) {
if ((*i)->period().from <= period.to && (*i)->period().to >= period.from) {
out.push_back (*i);
}
}
return out;
}
list<shared_ptr<ContentTextSubtitle> >
SubtitleDecoder::get_text_subtitles (ContentTimePeriod period)
{
return get<ContentTextSubtitle> (_decoded_text_subtitles, period);
}
list<shared_ptr<ContentImageSubtitle> >
SubtitleDecoder::get_image_subtitles (ContentTimePeriod period)
{
return get<ContentImageSubtitle> (_decoded_image_subtitles, period);
}
void
SubtitleDecoder::seek (ContentTime, bool)
{
_decoded_text_subtitles.clear ();
_decoded_image_subtitles.clear ();
}
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