1 files changed, 79 insertions, 0 deletions
diff --git a/src/multimedia/qsymbolsresolveutils.cpp b/src/multimedia/qsymbolsresolveutils.cpp
new file mode 100644
index 000000000..81c7410d2
--- /dev/null
+++ b/src/multimedia/qsymbolsresolveutils.cpp
@@ -0,0 +1,79 @@
+// Copyright (C) 2024 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
+
+#include "qsymbolsresolveutils_p.h"
+
+#include <qdebug.h>
+#include <algorithm>
+#include <qloggingcategory.h>
+
+QT_BEGIN_NAMESPACE
+
+Q_STATIC_LOGGING_CATEGORY(qLcSymbolsResolver, "qt.multimedia.symbolsresolver");
+
+bool SymbolsResolver::isLazyLoadEnabled()
+{
+    static const bool lazyLoad =
+            !static_cast<bool>(qEnvironmentVariableIntValue("QT_INSTANT_LOAD_FFMPEG_STUBS"));
+    return lazyLoad;
+}
+
+SymbolsResolver::SymbolsResolver(const char *libLoggingName, LibraryLoader loader)
+    : m_libLoggingName(libLoggingName)
+{
+    Q_ASSERT(libLoggingName);
+    Q_ASSERT(loader);
+
+    auto library = loader();
+    if (library && library->isLoaded())
+        m_library = std::move(library);
+    else
+        qCWarning(qLcSymbolsResolver) << "Couldn't load" << m_libLoggingName << "library";
+}
+
+SymbolsResolver::SymbolsResolver(const char *libName, const char *version,
+                                 const char *libLoggingName)
+    : m_libLoggingName(libLoggingName ? libLoggingName : libName)
+{
+    Q_ASSERT(libName);
+    Q_ASSERT(version);
+
+    auto library = std::make_unique<QLibrary>(QString::fromLocal8Bit(libName),
+                                              QString::fromLocal8Bit(version));
+    if (library->load())
+        m_library = std::move(library);
+    else
+        qCWarning(qLcSymbolsResolver) << "Couldn't load" << m_libLoggingName << "library";
+}
+
+SymbolsResolver::~SymbolsResolver()
+{
+    if (m_library)
+        m_library->unload();
+}
+
+QFunctionPointer SymbolsResolver::initFunction(const char *funcName)
+{
+    if (!m_library)
+        return nullptr;
+    if (auto func = m_library->resolve(funcName))
+        return func;
+
+    qCWarning(qLcSymbolsResolver) << "Couldn't resolve" << m_libLoggingName << "symbol" << funcName;
+    m_library->unload();
+    m_library.reset();
+    return nullptr;
+}
+
+void SymbolsResolver::checkLibrariesLoaded(SymbolsMarker *begin, SymbolsMarker *end)
+{
+    if (m_library) {
+        qCDebug(qLcSymbolsResolver) << m_libLoggingName << "symbols resolved";
+    } else {
+        const auto size = reinterpret_cast<char *>(end) - reinterpret_cast<char *>(begin);
+        memset(begin, 0, size);
+        qCWarning(qLcSymbolsResolver) << "Couldn't resolve" << m_libLoggingName << "symbols";
+    }
+}
+
+QT_END_NAMESPACE