X-Git-Url: https://main.carlh.net/gitweb/?a=blobdiff_plain;f=src%2Flib%2Fsubtitle_decoder.cc;h=e9692b99f586f752a53928f9f2492b1716d12e5b;hb=504c63b3d62038bc486ca8a09e77fbb403907edd;hp=e5cadb7b48b4e513c3b11a7ad47babc10ecda689;hpb=8aeb741ccbe2edb528e98a431bf55459a6836a9b;p=dcpomatic.git

diff --git a/src/lib/subtitle_decoder.cc b/src/lib/subtitle_decoder.cc
index e5cadb7b4..e9692b99f 100644
--- a/src/lib/subtitle_decoder.cc
+++ b/src/lib/subtitle_decoder.cc
@@ -1,5 +1,5 @@
 /*
-    Copyright (C) 2013 Carl Hetherington <cth@carlh.net>
+    Copyright (C) 2013-2016 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
@@ -17,31 +17,117 @@
 
 */
 
-#include <boost/shared_ptr.hpp>
 #include "subtitle_decoder.h"
+#include "subtitle_content.h"
+#include <boost/shared_ptr.hpp>
+#include <boost/foreach.hpp>
+#include <iostream>
 
 using std::list;
+using std::cout;
 using boost::shared_ptr;
 using boost::optional;
+using boost::function;
 
-SubtitleDecoder::SubtitleDecoder (shared_ptr<const Film> f)
-	: Decoder (f)
+SubtitleDecoder::SubtitleDecoder (
+	Decoder* parent,
+	shared_ptr<const SubtitleContent> c,
+	function<list<ContentTimePeriod> (ContentTimePeriod, bool)> image_subtitles_during,
+	function<list<ContentTimePeriod> (ContentTimePeriod, bool)> text_subtitles_during
+	)
+	: _parent (parent)
+	, _subtitle_content (c)
+	, _image_subtitles_during (image_subtitles_during)
+	, _text_subtitles_during (text_subtitles_during)
 {
 
 }
 
-
 /** Called by subclasses when an image subtitle is ready.
- *  Image may be 0 to say that there is no current subtitle.
+ *  @param period Period of the subtitle.
+ *  @param image Subtitle image.
+ *  @param rect Area expressed as a fraction of the video frame that this subtitle
+ *  is for (e.g. a width of 0.5 means the width of the subtitle is half the width
+ *  of the video frame)
  */
 void
-SubtitleDecoder::image_subtitle (shared_ptr<Image> image, dcpomatic::Rect<double> rect, ContentTime from, ContentTime to)
+SubtitleDecoder::image_subtitle (ContentTimePeriod period, shared_ptr<Image> image, dcpomatic::Rect<double> rect)
+{
+	_decoded_image_subtitles.push_back (ContentImageSubtitle (period, image, rect));
+}
+
+void
+SubtitleDecoder::text_subtitle (ContentTimePeriod period, list<dcp::SubtitleString> s)
+{
+	_decoded_text_subtitles.push_back (ContentTextSubtitle (period, s));
+}
+
+/** @param sp Full periods of subtitles that are showing or starting during the specified period */
+template <class T>
+list<T>
+SubtitleDecoder::get (list<T> const & subs, list<ContentTimePeriod> const & sp, ContentTimePeriod period, bool starting, bool accurate)
+{
+	if (sp.empty ()) {
+		/* Nothing in this period */
+		return list<T> ();
+	}
+
+	/* Seek if what we want is before what we have, or a more than a little bit after */
+	if (subs.empty() || sp.back().to < subs.front().period().from || sp.front().from > (subs.back().period().to + ContentTime::from_seconds (1))) {
+		seek (sp.front().from, true);
+	}
+
+	/* Now enough pass() calls will either:
+	 *  (a) give us what we want, or
+	 *  (b) hit the end of the decoder.
+	 */
+	while (!_parent->pass(Decoder::PASS_REASON_SUBTITLE, accurate) && (subs.empty() || (subs.back().period().to < sp.back().to))) {}
+
+	/* Now look for what we wanted in the data we have collected */
+	/* XXX: inefficient */
+
+	list<T> out;
+	for (typename list<T>::const_iterator i = subs.begin(); i != subs.end(); ++i) {
+		if ((starting && period.contains (i->period().from)) || (!starting && period.overlaps (i->period ()))) {
+			out.push_back (*i);
+		}
+	}
+
+	/* Discard anything in _decoded_image_subtitles that is outside 5 seconds either side of period */
+
+	list<ContentImageSubtitle>::iterator i = _decoded_image_subtitles.begin();
+	while (i != _decoded_image_subtitles.end()) {
+		list<ContentImageSubtitle>::iterator tmp = i;
+		++tmp;
+
+		if (
+			i->period().to < (period.from - ContentTime::from_seconds (5)) ||
+			i->period().from > (period.to + ContentTime::from_seconds (5))
+			) {
+			_decoded_image_subtitles.erase (i);
+		}
+
+		i = tmp;
+	}
+
+	return out;
+}
+
+list<ContentTextSubtitle>
+SubtitleDecoder::get_text_subtitles (ContentTimePeriod period, bool starting, bool accurate)
+{
+	return get<ContentTextSubtitle> (_decoded_text_subtitles, _text_subtitles_during (period, starting), period, starting, accurate);
+}
+
+list<ContentImageSubtitle>
+SubtitleDecoder::get_image_subtitles (ContentTimePeriod period, bool starting, bool accurate)
 {
-	_pending.push_back (shared_ptr<DecodedImageSubtitle> (new DecodedImageSubtitle (image, rect, from, to)));
+	return get<ContentImageSubtitle> (_decoded_image_subtitles, _image_subtitles_during (period, starting), period, starting, accurate);
 }
 
 void
-SubtitleDecoder::text_subtitle (list<libdcp::Subtitle> s)
+SubtitleDecoder::seek (ContentTime, bool)
 {
-	_pending.push_back (shared_ptr<DecodedTextSubtitle> (new DecodedTextSubtitle (s)));
+	_decoded_text_subtitles.clear ();
+	_decoded_image_subtitles.clear ();
 }