LibWeb/EME: Implement get_supported_capabilities_for_audio_video_type

Author: https://github.com/stelar7
Commit: 8f2886733c
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/5665
Reviewed-by: https://github.com/gmta ✅
Reviewed-by: https://github.com/trflynn89

Libraries/LibWeb/EncryptedMediaExtensions/Algorithms.h

@@ -0,0 +1,20 @@
+/*
+ * Copyright (c) 2025, stelar7 <dudedbz@gmail.com>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include <AK/Optional.h>
+#include <AK/Types.h>
+#include <AK/Vector.h>
+#include <LibURL/URL.h>
+#include <LibWeb/EncryptedMediaExtensions/KeySystem.h>
+
+namespace Web::EncryptedMediaExtensions {
+
+bool supports_container(Utf16String const& container);
+Optional<Vector<Bindings::MediaKeySystemMediaCapability>> get_supported_capabilities_for_audio_video_type(KeySystem const&, CapabilitiesType, Vector<Bindings::MediaKeySystemMediaCapability>, Bindings::MediaKeySystemConfiguration, MediaKeyRestrictions);
+
+}