Store reel lengths in DCPContent to speed up e.g. timeline with many DCPs.

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

diff --git a/src/lib/dcp_content.cc b/src/lib/dcp_content.cc
index 8c1b2d8a1994e9019196f51b84014b21b8a8bcaf..2eead3ee00d38be0212c411a7c695bfab771a0a5 100644 (file)
--- a/src/lib/dcp_content.cc
+++ b/src/lib/dcp_content.cc
@@ -120,6 +120,9 @@ DCPContent::DCPContent (shared_ptr<const Film> film, cxml::ConstNodePtr node, in
        }
        _three_d = node->optional_bool_child("ThreeD").get_value_or (false);
        _cpl = node->optional_string_child("CPL");
+       BOOST_FOREACH (cxml::ConstNodePtr i, node->node_children("ReelLength")) {
+               _reel_lengths.push_back (raw_convert<int64_t> (i->content ()));
+       }
 }
 
 void
@@ -172,6 +175,7 @@ DCPContent::examine (shared_ptr<Job> job)
                _standard = examiner->standard ();
                _three_d = examiner->three_d ();
                _cpl = examiner->cpl ();
+               _reel_lengths = examiner->reel_lengths ();
        }
 
        if (needed_assets != needs_assets ()) {
@@ -253,6 +257,9 @@ DCPContent::as_xml (xmlpp::Node* node, bool with_paths) const
        if (_cpl) {
                node->add_child("CPL")->add_child_text (_cpl.get ());
        }
+       BOOST_FOREACH (int64_t i, _reel_lengths) {
+               node->add_child("ReelLength")->add_child_text (raw_convert<string> (i));
+       }
 }
 
 DCPTime
@@ -363,17 +370,20 @@ DCPContent::set_reference_subtitle (bool r)
 list<DCPTimePeriod>
 DCPContent::reels () const
 {
-       list<DCPTimePeriod> p;
-       scoped_ptr<DCPDecoder> decoder;
-       try {
-               decoder.reset (new DCPDecoder (shared_from_this(), film()->log()));
-       } catch (...) {
-               /* Could not load the DCP; guess reels */
-               list<DCPTimePeriod> p;
-               p.push_back (DCPTimePeriod (position(), end()));
-               return p;
+       list<int64_t> reel_lengths = _reel_lengths;
+       if (reel_lengths.empty ()) {
+               /* Old metadata with no reel lengths; get them here instead */
+               try {
+                       scoped_ptr<DCPExaminer> examiner (new DCPExaminer (shared_from_this()));
+                       reel_lengths = examiner->reel_lengths ();
+               } catch (...) {
+                       /* Could not examine the DCP; guess reels */
+                       reel_lengths.push_back (length_after_trim().frames_round (film()->video_frame_rate ()));
+               }
        }
 
+       list<DCPTimePeriod> p;
+
        /* This content's frame rate must be the same as the output DCP rate, so we can
           convert `directly' from ContentTime to DCPTime.
        */
@@ -381,9 +391,9 @@ DCPContent::reels () const
        /* The starting point of this content on the timeline */
        DCPTime pos = position() - DCPTime (trim_start().get());
 
-       BOOST_FOREACH (shared_ptr<dcp::Reel> i, decoder->reels ()) {
+       BOOST_FOREACH (int64_t i, reel_lengths) {
                /* This reel runs from `pos' to `to' */
-               DCPTime const to = pos + DCPTime::from_frames (i->main_picture()->duration(), film()->video_frame_rate());
+               DCPTime const to = pos + DCPTime::from_frames (i, film()->video_frame_rate());
                if (to > position()) {
                        p.push_back (DCPTimePeriod (max(position(), pos), min(end(), to)));
                        if (to > end()) {