Add Film::possible_reel_types().

1 files changed, 41 insertions, 0 deletions

diff --git a/src/lib/film.cc b/src/lib/film.cc
index f0af131ea..c969ff699 100644
--- a/src/lib/film.cc
+++ b/src/lib/film.cc
@@ -2469,3 +2469,44 @@ Film::write_remembered_assets(vector<RememberedAsset> const& assets) const
 		LOG_ERROR("Could not write assets file %1", file(assets_file));
 	}
 }
+
+
+vector<ReelType>
+Film::possible_reel_types() const
+{
+	auto film_reels = reels_for_type(ReelType::SINGLE);
+
+	bool referring = false;
+	bool dcp_reel_not_present = false;
+
+	for (auto c: content()) {
+		if (auto dcp = dynamic_pointer_cast<DCPContent>(c)) {
+			if (dcp->reference_anything()) {
+				referring = true;
+				try {
+					for (auto const& dcp_reel: dcp->reels(shared_from_this())) {
+						if (std::find(film_reels.begin(), film_reels.end(), dcp_reel) == film_reels.end()) {
+							dcp_reel_not_present = true;
+						}
+					}
+				} catch (dcp::ReadError &) {
+					/* We couldn't read the DCP; it's probably missing */
+				}
+			}
+		}
+	}
+
+	if (referring && !dcp_reel_not_present) {
+		/* We're referring to some DCP content but single-reel mode is possible.
+		 * We'll disallow BY_LENGTH and CUSTOM just for an easy life.
+		 */
+
+		return { ReelType::SINGLE, ReelType::BY_VIDEO_CONTENT };
+	} else if (referring && dcp_reel_not_present) {
+		/* We have to use by-video */
+		return { ReelType::BY_VIDEO_CONTENT };
+	}
+
+	return { ReelType::SINGLE, ReelType::BY_VIDEO_CONTENT, ReelType::BY_LENGTH, ReelType::CUSTOM };
+}
+