Tell the user when they load a KDM which will not do anything useful (part of #1161).

diff --git a/src/wx/content_menu.cc b/src/wx/content_menu.cc
index e9b6c32409cebe8e43f647bc7b64a340675c024d..ec966b81a5ac9e95bcfa4e32a15eb590d3da19b6 100644 (file)
--- a/src/wx/content_menu.cc
+++ b/src/wx/content_menu.cc
@@ -52,6 +52,7 @@ using std::list;
 using boost::shared_ptr;
 using boost::weak_ptr;
 using boost::dynamic_pointer_cast;
+using boost::optional;
 
 enum {
        /* Start at 256 so we can have IDs on _cpl_menu from 1 to 255 */
@@ -405,14 +406,38 @@ ContentMenu::kdm ()
        wxFileDialog* d = new wxFileDialog (_parent, _("Select KDM"));
 
        if (d->ShowModal() == wxID_OK) {
+               optional<dcp::EncryptedKDM> kdm;
                try {
-                       dcp->add_kdm (dcp::EncryptedKDM (dcp::file_to_string (wx_to_std (d->GetPath ()), MAX_KDM_SIZE)));
+                       kdm = dcp::EncryptedKDM (dcp::file_to_string(wx_to_std(d->GetPath()), MAX_KDM_SIZE));
                } catch (exception& e) {
                        error_dialog (_parent, _("Could not load KDM"), std_to_wx(e.what()));
                        d->Destroy ();
                        return;
                }
 
+               DCPExaminer ex (dcp, true);
+
+               bool kdm_matches_any_cpl = false;
+               BOOST_FOREACH (shared_ptr<dcp::CPL> i, ex.cpls()) {
+                       if (i->id() == kdm->cpl_id()) {
+                               kdm_matches_any_cpl = true;
+                       }
+               }
+
+
+               bool kdm_matches_selected_cpl = dcp->cpl() || kdm->cpl_id() == dcp->cpl().get();
+
+               if (!kdm_matches_any_cpl) {
+                       error_dialog (_parent, _("This KDM was not made for this DCP.  You will need a different one."));
+                       return;
+               }
+
+               if (!kdm_matches_selected_cpl && kdm_matches_any_cpl) {
+                       message_dialog (_parent, _("This KDM was made for one of the CPLs in this DCP, but not the currently selected one.  To play the currently-selected CPL you will need a different KDM."));
+               }
+
+               dcp->add_kdm (*kdm);
+
                shared_ptr<Film> film = _film.lock ();
                DCPOMATIC_ASSERT (film);
                JobManager::instance()->add (shared_ptr<Job> (new ExamineContentJob (film, dcp)));