Add MPEG2 bitrate test.

2 files changed, 117 insertions, 0 deletions

diff --git a/test/mpeg2_dcp_test.cc b/test/mpeg2_dcp_test.cc
new file mode 100644
index 000000000..dd439eac6
--- /dev/null
+++ b/test/mpeg2_dcp_test.cc
@@ -0,0 +1,116 @@
+/*
+    Copyright (C) 2025 Carl Hetherington <cth@carlh.net>
+
+    This file is part of DCP-o-matic.
+
+    DCP-o-matic is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    DCP-o-matic is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with DCP-o-matic.  If not, see <http://www.gnu.org/licenses/>.
+
+*/
+
+
+#include "test.h"
+#include "lib/content_factory.h"
+#include "lib/dcp_content.h"
+#include "lib/film.h"
+#include "lib/video_encoding.h"
+#ifdef DCPOMATIC_LINUX
+#include <boost/process.hpp>
+#endif
+#include <boost/test/unit_test.hpp>
+
+
+using std::make_shared;
+using std::shared_ptr;
+using std::string;
+
+
+static
+float
+mbits_per_second(shared_ptr<const Film> film)
+{
+	auto const mxf = find_file(film->dir(film->dcp_name()), "mpeg2");
+	auto const size = boost::filesystem::file_size(mxf);
+	auto const seconds = film->length().seconds();
+	return ((size * 8) / seconds) / 1e6;
+}
+
+
+#ifdef DCPOMATIC_LINUX
+static
+string
+bitrate_in_header(shared_ptr<const Film> film)
+{
+	namespace bp = boost::process;
+
+	bp::ipstream stream;
+	bp::child child(boost::process::search_path("mediainfo"), find_file(film->dir(film->dcp_name()), "mpeg2"), bp::std_out > stream);
+
+	string line;
+	string rate;
+	while (child.running() && std::getline(stream, line)) {
+		if (line.substr(0, 10) == "Bit rate  ") {
+			auto colon = line.find(":");
+			if (colon != string::npos) {
+				rate = line.substr(colon + 2);
+			}
+		}
+	}
+
+	child.wait();
+
+	return rate;
+}
+#endif
+
+
+BOOST_AUTO_TEST_CASE(mpeg2_video_bitrate1)
+{
+	auto content = content_factory(TestPaths::private_data() / "boon_telly.mkv");
+	auto film = new_test_film("mpeg2_video_bitrate", content);
+	film->set_video_bit_rate(VideoEncoding::MPEG2, 25000000);
+	film->set_video_encoding(VideoEncoding::MPEG2);
+	film->set_interop(true);
+
+	make_and_verify_dcp(
+		film,
+		{ dcp::VerificationNote::Code::INVALID_STANDARD },
+		false, false
+	);
+
+	BOOST_CHECK_CLOSE(mbits_per_second(film), 25.0047, 1e-3);
+#ifdef DCPOMATIC_LINUX
+	BOOST_CHECK_EQUAL(bitrate_in_header(film), "25.0 Mb/s");
+#endif
+}
+
+
+BOOST_AUTO_TEST_CASE(mpeg2_video_bitrate2)
+{
+	auto content = make_shared<DCPContent>(TestPaths::private_data() / "JourneyToJah_TLR-1_F_EN-DE-FR_CH_51_2K_LOK_20140225_DGL_SMPTE_OV");
+	auto film = new_test_film("mpeg2_video_bitrate", { content });
+	film->set_video_bit_rate(VideoEncoding::MPEG2, 5000000);
+	film->set_video_encoding(VideoEncoding::MPEG2);
+	film->set_interop(true);
+
+	make_and_verify_dcp(
+		film,
+		{ dcp::VerificationNote::Code::INVALID_STANDARD },
+		false, false
+	);
+
+	BOOST_CHECK_CLOSE(mbits_per_second(film), 5.02106571, 1e-3);
+#ifdef DCPOMATIC_LINUX
+	BOOST_CHECK_EQUAL(bitrate_in_header(film), "5 000 kb/s");
+#endif
+}
diff --git a/test/wscript b/test/wscript
index 7e53dfb02..868d98c58 100644
--- a/test/wscript
+++ b/test/wscript
@@ -131,6 +131,7 @@ def build(bld):
                  markers_test.cc
                  map_cli_test.cc
                  mca_subdescriptors_test.cc
+                 mpeg2_dcp_test.cc
                  no_use_video_test.cc
                  open_caption_test.cc
                  optimise_stills_test.cc