Don't bother decoding video frames when we're seeking around trying to find subtitles.

[dcpomatic.git] / src / lib / subtitle_decoder.cc

diff --git a/src/lib/subtitle_decoder.cc b/src/lib/subtitle_decoder.cc
index 7ba969933d077717ed125546657767d8fcc1aeda..edb291ab8dc65924c1f314a944fff21b0e1fd825 100644 (file)
--- 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) 2013-2015 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
@@ -19,22 +19,89 @@
 
 #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 Film> f)
-       : Decoder (f)
+SubtitleDecoder::SubtitleDecoder (shared_ptr<const SubtitleContent> c)
+       : _subtitle_content (c)
 {
 
 }
 
-
-/** Called by subclasses when a subtitle is ready.
- *  Image may be 0 to say that there is no current subtitle.
+/** Called by subclasses when an image subtitle is ready.
+ *  @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::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 (list<dcp::SubtitleString> s)
+{
+       _decoded_text_subtitles.push_back (ContentTextSubtitle (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)
+{
+       if (sp.empty ()) {
+               /* Nothing in this period */
+               return list<T> ();
+       }
+
+       /* Seek if what we want is before what we have, or more than a reasonable amount after */
+       if (subs.empty() || sp.back().to < subs.front().period().from || sp.front().from > (subs.back().period().to + ContentTime::from_seconds (5))) {
+               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 (!pass(PASS_REASON_SUBTITLE) && (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);
+               }
+       }
+
+       /* XXX: should clear out _decoded_* at some point */
+
+       return out;
+}
+
+list<ContentTextSubtitle>
+SubtitleDecoder::get_text_subtitles (ContentTimePeriod period, bool starting)
+{
+       return get<ContentTextSubtitle> (_decoded_text_subtitles, text_subtitles_during (period, starting), period, starting);
+}
+
+list<ContentImageSubtitle>
+SubtitleDecoder::get_image_subtitles (ContentTimePeriod period, bool starting)
+{
+       return get<ContentImageSubtitle> (_decoded_image_subtitles, image_subtitles_during (period, starting), period, starting);
+}
+
+void
+SubtitleDecoder::seek (ContentTime, bool)
 {
-       _pending.push_back (shared_ptr<DecodedSubtitle> (new DecodedSubtitle (image, rect, from, to)));
+       _decoded_text_subtitles.clear ();
+       _decoded_image_subtitles.clear ();
 }