Replace find_and_resolve_cpls() with storing all CPL IDs in DCPContent (sometimes).

In some places we need other details than the ID, but in lots of places
this saves some disk searching.

6 files changed, 41 insertions, 9 deletions

diff --git a/src/lib/dcp_content.cc b/src/lib/dcp_content.cc
index e239e7b70..20d6bac48 100644
--- a/src/lib/dcp_content.cc
+++ b/src/lib/dcp_content.cc
@@ -144,7 +144,17 @@ DCPContent::DCPContent(cxml::ConstNodePtr node, boost::optional<boost::filesyste
 	if (ck) {
 		_content_kind = dcp::ContentKind::from_name(*ck);
 	}
-	_cpl = node->optional_string_child("CPL");
+	for (auto cpl: node->node_children("CPL")) {
+		_cpls.push_back(cpl->content());
+		if (auto selected = cpl->optional_bool_attribute("selected")) {
+			if (selected) {
+				_cpl = cpl->content();
+			}
+		}
+	}
+	if (!_cpl && !_cpls.empty()) {
+		_cpl = _cpls.front();
+	}
 	for (auto i: node->node_children("ReelLength")) {
 		_reel_lengths.push_back(raw_convert<int64_t>(i->content()));
 	}
@@ -323,6 +333,7 @@ DCPContent::examine(shared_ptr<Job> job, bool tolerant)
 		_video_encoding = examiner->video_encoding();
 		_three_d = examiner->three_d();
 		_content_kind = examiner->content_kind();
+		_cpls = examiner->cpls();
 		_cpl = examiner->cpl();
 		_reel_lengths = examiner->reel_lengths();
 		_markers = examiner->markers();
@@ -445,8 +456,12 @@ DCPContent::as_xml(xmlpp::Element* element, bool with_paths, PathBehaviour path_
 	if (_content_kind) {
 		cxml::add_text_child(element, "ContentKind", _content_kind->name());
 	}
-	if (_cpl) {
-		cxml::add_text_child(element, "CPL", _cpl.get());
+	for (auto cpl: _cpls) {
+		auto e = cxml::add_child(element, "CPL");
+		e->add_child_text(cpl);
+		if (cpl == _cpl) {
+			e->set_attribute("selected", "1");
+		}
 	}
 	for (auto i: _reel_lengths) {
 		cxml::add_text_child(element, "ReelLength", fmt::to_string(i));
diff --git a/src/lib/dcp_content.h b/src/lib/dcp_content.h
index 71d311bf1..34094b4a1 100644
--- a/src/lib/dcp_content.h
+++ b/src/lib/dcp_content.h
@@ -166,6 +166,11 @@ public:
 
 	void set_cpl(std::string id);
 
+	std::vector<std::string> cpls() const {
+		boost::mutex::scoped_lock lm(_mutex);
+		return _cpls;
+	}
+
 	boost::optional<std::string> cpl() const {
 		boost::mutex::scoped_lock lm(_mutex);
 		return _cpl;
@@ -262,6 +267,7 @@ private:
 	boost::optional<VideoEncoding> _video_encoding;
 	boost::optional<dcp::ContentKind> _content_kind;
 	bool _three_d;
+	std::vector<std::string> _cpls;
 	/** ID of the CPL to use; older metadata might not specify this: in that case
 	 *  just use the only CPL.
 	 */
diff --git a/src/lib/dcp_decoder.cc b/src/lib/dcp_decoder.cc
index 42119a041..4809d772a 100644
--- a/src/lib/dcp_decoder.cc
+++ b/src/lib/dcp_decoder.cc
@@ -101,6 +101,10 @@ DCPDecoder::DCPDecoder(shared_ptr<const Film> film, shared_ptr<const DCPContent>
 
 	   We do this by storing a digest of the important bits of the DCPContent and then checking that's
 	   the same before we re-use _reels.
+
+	   XXX: this seems a bit dubious - why is a complete re-examine not necessary in this case?
+	   Or why is this done for DCPs only, and not other files that might change?
+	   (see blame for the comment above for some reasons)
 	*/
 
 	_lazy_digest = calculate_lazy_digest(content);
diff --git a/src/lib/dcp_examiner.cc b/src/lib/dcp_examiner.cc
index a5180822a..c67410f76 100644
--- a/src/lib/dcp_examiner.cc
+++ b/src/lib/dcp_examiner.cc
@@ -119,6 +119,9 @@ DCPExaminer::DCPExaminer(shared_ptr<const DCPContent> content, bool tolerant)
 		selected_cpl->add(decrypt_kdm_with_helpful_error(content->kdm().get()));
 	}
 
+	for (auto cpl: cpls) {
+		_cpls.push_back(cpl->id());
+	}
 	_cpl = selected_cpl->id();
 	_name = selected_cpl->content_title_text();
 	_content_kind = selected_cpl->content_kind();
@@ -360,8 +363,6 @@ DCPExaminer::DCPExaminer(shared_ptr<const DCPContent> content, bool tolerant)
 	for (auto version: selected_cpl->content_versions()) {
 		_content_versions.push_back(version.label_text);
 	}
-
-	_cpl = selected_cpl->id();
 }
 
 
diff --git a/src/lib/dcp_examiner.h b/src/lib/dcp_examiner.h
index 8dd865762..e88788402 100644
--- a/src/lib/dcp_examiner.h
+++ b/src/lib/dcp_examiner.h
@@ -163,6 +163,10 @@ public:
 		return *_content_kind;
 	}
 
+	std::vector<std::string> cpls() const {
+		return _cpls;
+	}
+
 	std::string cpl() const {
 		return _cpl;
 	}
@@ -233,6 +237,7 @@ private:
 	boost::optional<VideoEncoding> _video_encoding;
 	bool _three_d = false;
 	boost::optional<dcp::ContentKind> _content_kind;
+	std::vector<std::string> _cpls;
 	std::string _cpl;
 	std::list<int64_t> _reel_lengths;
 	std::map<dcp::Marker, dcpomatic::ContentTime> _markers;
diff --git a/src/lib/show_playlist_content_store.cc b/src/lib/show_playlist_content_store.cc
index 1a9f533af..6e1100c70 100644
--- a/src/lib/show_playlist_content_store.cc
+++ b/src/lib/show_playlist_content_store.cc
@@ -70,12 +70,13 @@ ShowPlaylistContentStore::update(std::function<bool()> pulse)
 
 			if (is_directory(i) && contains_assetmap(i)) {
 				auto dcp = make_shared<DCPContent>(i);
+				examine(dcp);
 				/* Add a Content for each CPL in this DCP, so we can choose CPLs to play
 				 * rather than DCPs.
 				 */
-				for (auto cpl: dcp::find_and_resolve_cpls(dcp->directories(), true)) {
+				for (auto cpl: dcp->cpls()) {
 					auto copy = dynamic_pointer_cast<DCPContent>(dcp->clone());
-					copy->set_cpl(cpl->id());
+					copy->set_cpl(cpl);
 					examine(copy);
 				}
 			} else if (i.path().extension() == ".mp4") {
@@ -121,8 +122,8 @@ ShowPlaylistContentStore::get(string const& uuid) const
 {
 	auto iter = std::find_if(_content.begin(), _content.end(), [uuid](shared_ptr<const Content> content) {
 		if (auto dcp = dynamic_pointer_cast<const DCPContent>(content)) {
-			for (auto cpl: dcp::find_and_resolve_cpls(dcp->directories(), true)) {
-				if (cpl->id() == uuid) {
+			for (auto cpl: dcp->cpls()) {
+				if (cpl == uuid) {
 					return true;
 				}
 			}