1 files changed, 80 insertions, 0 deletions
diff --git a/dom/media/gmp/GMPLoader.h b/dom/media/gmp/GMPLoader.h
new file mode 100644
index 0000000000..a0e1513d34
--- /dev/null
+++ b/dom/media/gmp/GMPLoader.h
@@ -0,0 +1,80 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ * vim: sw=2 ts=4 et :
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef GMP_LOADER_H__
+#define GMP_LOADER_H__
+
+#include <stdint.h>
+#include "prlink.h"
+#include "gmp-entrypoints.h"
+#include "mozilla/UniquePtr.h"
+#include "nsString.h"
+
+#if defined(XP_MACOSX) && defined(MOZ_SANDBOX)
+#  include "mozilla/Sandbox.h"
+#endif
+
+namespace mozilla::gmp {
+
+class SandboxStarter {
+ public:
+  virtual ~SandboxStarter() = default;
+  virtual bool Start(const char* aLibPath) = 0;
+};
+
+// Interface that adapts a plugin to the GMP API.
+class GMPAdapter {
+ public:
+  virtual ~GMPAdapter() = default;
+  // Sets the adapted to plugin library module.
+  // Note: the GMPAdapter is responsible for calling PR_UnloadLibrary on aLib
+  // when it's finished with it.
+  virtual void SetAdaptee(PRLibrary* aLib) = 0;
+
+  // These are called in place of the corresponding GMP API functions.
+  virtual GMPErr GMPInit(const GMPPlatformAPI* aPlatformAPI) = 0;
+  // The `aKeySystem` arg is used to specify the key system when loading CDMs,
+  // and will be ignored by non-CDM GMPs. It is not part of the public GMP API
+  // Gecko exposes.
+  virtual GMPErr GMPGetAPI(const char* aAPIName, void* aHostAPI,
+                           void** aPluginAPI, const nsACString& aKeySystem) = 0;
+  virtual void GMPShutdown() = 0;
+};
+
+// Encapsulates activating the sandbox, and loading the GMP.
+// Load() takes an optional GMPAdapter which can be used to adapt non-GMPs
+// to adhere to the GMP API.
+class GMPLoader {
+ public:
+  GMPLoader();
+
+  // Activates the sandbox, then loads the GMP library. If aAdapter is
+  // non-null, the lib path is assumed to be a non-GMP, and the adapter
+  // is initialized with the lib and the adapter is used to interact with
+  // the plugin.
+  bool Load(const char* aUTF8LibPath, uint32_t aLibPathLen,
+            const GMPPlatformAPI* aPlatformAPI, GMPAdapter* aAdapter = nullptr);
+
+  // Retrieves an interface pointer from the GMP. If the GMP is loading a CDM,
+  // aKeySystem is passed to the CDM to allow for key system specific
+  // configuration by the CDM.
+  GMPErr GetAPI(const char* aAPIName, void* aHostAPI, void** aPluginAPI,
+                const nsACString& aKeySystem);
+
+  // Calls the GMPShutdown function exported by the GMP lib, and unloads the
+  // plugin library.
+  void Shutdown();
+
+  bool CanSandbox() const;
+
+ private:
+  UniquePtr<SandboxStarter> mSandboxStarter;
+  UniquePtr<GMPAdapter> mAdapter;
+};
+
+}  // namespace mozilla::gmp
+
+#endif  // GMP_LOADER_H__