From 2c3f7f03e50c6bb618b3f1b321b4ed27788152f9 Mon Sep 17 00:00:00 2001
From: Carl Hetherington <cth@carlh.net>
Date: Wed, 9 Dec 2020 01:08:14 +0100
Subject: Bv2.1 6.2.1: Check that subtitle reel <Language> conforms to RFC
 5646.

---
 src/reel_subtitle_asset.h |  4 ++++
 src/verify.cc             | 30 ++++++++++++++++++++++++++++--
 src/verify.h              |  2 ++
 3 files changed, 34 insertions(+), 2 deletions(-)

(limited to 'src')

diff --git a/src/reel_subtitle_asset.h b/src/reel_subtitle_asset.h
index 13e72133..8c3b7d18 100644
--- a/src/reel_subtitle_asset.h
+++ b/src/reel_subtitle_asset.h
@@ -43,6 +43,8 @@
 #include "reel_mxf.h"
 #include "subtitle_asset.h"
 
+struct verify_test26;
+
 namespace dcp {
 
 class SubtitleAsset;
@@ -70,6 +72,8 @@ public:
 	}
 
 private:
+	friend struct ::verify_test26;
+
 	std::string key_type () const;
 	std::string cpl_node_name (Standard standard) const;
 
diff --git a/src/verify.cc b/src/verify.cc
index f3ecb1f4..b4408946 100644
--- a/src/verify.cc
+++ b/src/verify.cc
@@ -394,6 +394,17 @@ verify_asset (shared_ptr<const DCP> dcp, shared_ptr<const ReelMXF> reel_mxf, fun
 }
 
 
+void
+verify_language_tag (string tag, list<VerificationNote>& notes)
+{
+	try {
+		dcp::LanguageTag test (tag);
+	} catch (dcp::LanguageTagError &) {
+		notes.push_back (VerificationNote(VerificationNote::VERIFY_BV21_ERROR, VerificationNote::BAD_LANGUAGE, tag));
+	}
+}
+
+
 enum VerifyPictureAssetResult
 {
 	VERIFY_PICTURE_ASSET_RESULT_GOOD,
@@ -543,6 +554,16 @@ verify_main_sound_asset (
 }
 
 
+static void
+verify_main_subtitle_reel (shared_ptr<const ReelSubtitleAsset> reel_asset, list<VerificationNote>& notes)
+{
+	/* XXX: is Language compulsory? */
+	if (reel_asset->language()) {
+		verify_language_tag (*reel_asset->language(), notes);
+	}
+}
+
+
 static void
 verify_main_subtitle_asset (
 	shared_ptr<const Reel> reel,
@@ -642,8 +663,11 @@ dcp::verify (
 					verify_main_sound_asset (dcp, reel, stage, progress, notes);
 				}
 
-				if (reel->main_subtitle() && reel->main_subtitle()->asset_ref().resolved()) {
-					verify_main_subtitle_asset (reel, stage, xsd_dtd_directory, notes);
+				if (reel->main_subtitle()) {
+					verify_main_subtitle_reel (reel->main_subtitle(), notes);
+					if (reel->main_subtitle()->asset_ref().resolved()) {
+						verify_main_subtitle_asset (reel, stage, xsd_dtd_directory, notes);
+					}
 				}
 			}
 		}
@@ -704,6 +728,8 @@ dcp::note_to_string (dcp::VerificationNote note)
 		return String::compose("An asset that this DCP refers to is not included in the DCP.  It may be a VF.  Missing asset is %1.", note.note().get());
 	case dcp::VerificationNote::NOT_SMPTE:
 		return "This DCP does not use the SMPTE standard, which is required for Bv2.1 compliance.";
+	case dcp::VerificationNote::BAD_LANGUAGE:
+		return String::compose("The DCP specifies a language '%1' which does not conform to the RFC 5646 standard.", note.note().get());
 	}
 
 	return "";
diff --git a/src/verify.h b/src/verify.h
index 0140066e..8eb5aa12 100644
--- a/src/verify.h
+++ b/src/verify.h
@@ -92,6 +92,8 @@ public:
 		EXTERNAL_ASSET,
 		/** DCP is Interop, not SMPTE [Bv2.1_6.1] */
 		NOT_SMPTE,
+		/** A language or territory does not conform to RFC 5646 [Bv2.1_6.2.1] */
+		BAD_LANGUAGE,
 	};
 
 	VerificationNote (Type type, Code code)
-- 
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