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

diff --git a/src/lib/decoder.cc b/src/lib/decoder.cc
index 785fb96f0c2ed4b0b7637abba296bcbb61ca40b1..5d191512874916c74a82eed7ce049b9e2e33803d 100644 (file)
--- a/src/lib/decoder.cc
+++ b/src/lib/decoder.cc
@@ -1,5 +1,5 @@
 /*
-    Copyright (C) 2012-2016 Carl Hetherington <cth@carlh.net>
+    Copyright (C) 2012-2021 Carl Hetherington <cth@carlh.net>
 
     This file is part of DCP-o-matic.
 
@@ -18,27 +18,84 @@
 
 */
 
+
 #include "decoder.h"
 #include "video_decoder.h"
 #include "audio_decoder.h"
-#include "subtitle_decoder.h"
+#include "text_decoder.h"
+#include <boost/optional.hpp>
+#include <iostream>
+
+
+using std::cout;
+using boost::optional;
+using std::shared_ptr;
+using std::weak_ptr;
+using namespace dcpomatic;
+
+
+Decoder::Decoder (weak_ptr<const Film> film)
+       : WeakConstFilm (film)
+{
 
+}
+
+
+/** @return Earliest time of content that the next pass() will emit */
 ContentTime
 Decoder::position () const
 {
-       ContentTime pos;
+       optional<ContentTime> pos;
+       auto f = film();
 
-       if (video && video->position()) {
-               pos = min (pos, video->position().get());
+       if (video && !video->ignore() && (!pos || video->position(f).get_value_or(ContentTime()) < *pos)) {
+               pos = video->position(f);
        }
 
-       if (audio && audio->position()) {
-               pos = min (pos, audio->position().get());
+       if (audio && !audio->ignore() && (!pos || audio->position(f).get_value_or(ContentTime()) < *pos)) {
+               pos = audio->position(f);
        }
 
-       if (subtitle && subtitle->position()) {
-               pos = min (pos, subtitle->position().get());
+       /* Only decide position based on subtitle sources if there is nothing else
+          to go on.  Otherwise we can have problems with muxed sources which have
+          (for example) video, audio and a subtitle.  If the subtitle data runs out
+          before the video/audio the position() call will return the position of the
+          end of the subs.  This causes this file to be pass()ed in favour of others,
+          which can cause bugs like #1581.
+       */
+       if (!pos) {
+               for (auto i: text) {
+                       if (!i->ignore() && (!pos || i->position(f) < *pos)) {
+                               pos = i->position(f);
+                       }
+               }
        }
 
-       return pos;
+       return pos.get_value_or(ContentTime());
+}
+
+
+void
+Decoder::seek (ContentTime, bool)
+{
+       if (video) {
+               video->seek ();
+       }
+       if (audio) {
+               audio->seek ();
+       }
+       for (auto i: text) {
+               i->seek ();
+       }
+}
+
+
+shared_ptr<TextDecoder>
+Decoder::only_text () const
+{
+       DCPOMATIC_ASSERT (text.size() < 2);
+       if (text.empty()) {
+               return {};
+       }
+       return text.front();
 }