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/***************************************************************************
copyright : (C) 2026 by Antoine Colombier
email : antoine@mixxx.org
***************************************************************************/
/***************************************************************************
* This library is free software; you can redistribute it and/or modify *
* it under the terms of the GNU Lesser General Public License version *
* 2.1 as published by the Free Software Foundation. *
* *
* This library 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 *
* Lesser General Public License for more details. *
* *
* You should have received a copy of the GNU Lesser General Public *
* License along with this library; if not, write to the Free Software *
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA *
* 02110-1301 USA *
* *
* Alternatively, this file is available under the Mozilla Public *
* License Version 1.1. You may obtain a copy of the License at *
* http://www.mozilla.org/MPL/ *
***************************************************************************/
#include <string>
#include "tag.h"
#include "mp4file.h"
#include <cppunit/extensions/HelperMacros.h>
#include "utils.h"
using namespace std;
using namespace TagLib;
namespace {
const String STEM_KEY("STEM");
}
class TestMP4Stem : public CppUnit::TestFixture
{
CPPUNIT_TEST_SUITE(TestMP4Stem);
CPPUNIT_TEST(testCreate);
CPPUNIT_TEST(testUpdate);
CPPUNIT_TEST(testRemove);
CPPUNIT_TEST_SUITE_END();
protected:
static void createTestFile(ScopedFileCopy ©){
MP4::File f(copy.fileName().c_str());
CPPUNIT_ASSERT(!f.hasMP4Tag());
auto &tag = *f.tag();
CPPUNIT_ASSERT_EQUAL(0U, tag.complexProperties(STEM_KEY).size());
CPPUNIT_ASSERT(tag.setComplexProperties(STEM_KEY, List<VariantMap>({{{"manifest", ByteVector("{some text data}")}}})));
f.save();
}
public:
void testCreate()
{
ScopedFileCopy copy("no-tags", ".m4a");
createTestFile(copy);
// Assert whether the newly created stem content is as expected
{
MP4::File f(copy.fileName().c_str());
auto &tag = *f.tag();
CPPUNIT_ASSERT(f.hasMP4Tag());
auto stems = tag.complexProperties(STEM_KEY);
CPPUNIT_ASSERT_EQUAL(1U, stems.size());
CPPUNIT_ASSERT(stems.front().contains("manifest"));
CPPUNIT_ASSERT_EQUAL(Variant(ByteVector("{some text data}")), stems.front().find("manifest")->second);
}
}
void testUpdate()
{
ScopedFileCopy copy("no-tags", ".m4a");
createTestFile(copy);
// Prepare so large test data, to ensure that free padding is correctly used
char *buffer = new char[1025]{'X'};
buffer[1024] = '\0';
String artist(buffer);
std::memset(buffer, 'Y', 1024);
String title(buffer);
std::memset(buffer, 'Z', 1024);
ByteVector newStem(buffer);
delete [] buffer;
// Update tags and stems to force atom offset recalculation
{
MP4::File f(copy.fileName().c_str());
CPPUNIT_ASSERT(f.setComplexProperties("PICTURE", List<VariantMap>({
{
{"data", ByteVector("DummyData")},
{"pictureType", "Front Cover"},
{"mimeType", String("image/png")},
{"description", String("Test")}
}
})));
CPPUNIT_ASSERT(f.tag()->setComplexProperties(STEM_KEY, List<VariantMap>({{{"manifest", newStem}}})));
f.tag()->setArtist(artist);
f.tag()->setTitle(title);
f.save();
}
// Reload the file to assert its tags
{
MP4::File f(copy.fileName().c_str());
CPPUNIT_ASSERT(f.hasMP4Tag());
auto stems = f.tag()->complexProperties(STEM_KEY);
CPPUNIT_ASSERT_EQUAL(1U, stems.size());
CPPUNIT_ASSERT(stems.front().contains("manifest"));
CPPUNIT_ASSERT_EQUAL(Variant(newStem), stems.front().find("manifest")->second);
auto pictures = f.tag()->complexProperties("PICTURE");
CPPUNIT_ASSERT_EQUAL(1U, pictures.size());
CPPUNIT_ASSERT_EQUAL(VariantMap({
{
{"data", ByteVector("DummyData")},
{"mimeType", String("image/png")},
}
}), pictures.front());
CPPUNIT_ASSERT_EQUAL(title, f.tag()->title());
CPPUNIT_ASSERT_EQUAL(artist, f.tag()->artist());
}
}
void testRemove()
{
ScopedFileCopy copy("no-tags", ".m4a");
createTestFile(copy);
// Remove the stem
{
MP4::File f(copy.fileName().c_str());
CPPUNIT_ASSERT(f.hasMP4Tag());
CPPUNIT_ASSERT(f.tag()->setComplexProperties(STEM_KEY, List<VariantMap>()));
f.save();
}
{
MP4::File f(copy.fileName().c_str());
CPPUNIT_ASSERT(!f.hasMP4Tag());
CPPUNIT_ASSERT(!f.tag()->complexPropertyKeys().contains(STEM_KEY));
}
}
};
CPPUNIT_TEST_SUITE_REGISTRATION(TestMP4Stem);
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