media: Support creation and SetCdm() for mojo based CDM.

media/mojo/services/mojo_cdm_service.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef MEDIA_MOJO_SERVICES_MOJO_CDM_SERVICE_H_
 #define MEDIA_MOJO_SERVICES_MOJO_CDM_SERVICE_H_
 
 #include "base/callback.h"
 #include "base/macros.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
 #include "media/base/media_keys.h"
 #include "media/mojo/interfaces/content_decryption_module.mojom.h"
-#include "third_party/mojo/src/mojo/public/cpp/bindings/strong_binding.h"
+#include "third_party/mojo/src/mojo/public/cpp/bindings/binding.h"
+#include "third_party/mojo/src/mojo/public/cpp/bindings/error_handler.h"
 
 namespace media {
 
+class MojoCdmServiceContext;
+
 // A mojo::ContentDecryptionModule implementation backed by a media::MediaKeys.
-class MojoCdmService : public mojo::ContentDecryptionModule {
+class MojoCdmService : public mojo::ContentDecryptionModule,
+                       public mojo::ErrorHandler {
  public:
-  MojoCdmService(const mojo::String& key_system,
-                 mojo::InterfaceRequest<mojo::ContentDecryptionModule> request);
+  // Creates MojoCdmService for |key_system|. Returns nullptr if |key_system| is
+  // not supported. The returned object is owned by the caller.
+  static MojoCdmService* Create(
+      MojoCdmServiceContext* context,
+      const mojo::String& key_system,
+      mojo::InterfaceRequest<mojo::ContentDecryptionModule> request);
+
   ~MojoCdmService() final;
 
   // mojo::ContentDecryptionModule implementation.
   void SetClient(mojo::ContentDecryptionModuleClientPtr client) final;
   void SetServerCertificate(
       mojo::Array<uint8_t> certificate_data,
       const mojo::Callback<void(mojo::CdmPromiseResultPtr)>& callback) final;
   void CreateSessionAndGenerateRequest(
       mojo::ContentDecryptionModule::SessionType session_type,
       mojo::ContentDecryptionModule::InitDataType init_data_type,
       mojo::Array<uint8_t> init_data,
       const mojo::Callback<void(mojo::CdmPromiseResultPtr, mojo::String)>&
           callback) final;
   void LoadSession(mojo::ContentDecryptionModule::SessionType session_type,
                    const mojo::String& session_id,
                    const mojo::Callback<void(mojo::CdmPromiseResultPtr,
                                              mojo::String)>& callback) final;
   void UpdateSession(
       const mojo::String& session_id,
       mojo::Array<uint8_t> response,
       const mojo::Callback<void(mojo::CdmPromiseResultPtr)>& callback) final;
   void CloseSession(
       const mojo::String& session_id,
       const mojo::Callback<void(mojo::CdmPromiseResultPtr)>& callback) final;
   void RemoveSession(
       const mojo::String& session_id,
       const mojo::Callback<void(mojo::CdmPromiseResultPtr)>& callback) final;
-  void GetCdmContext(int32_t cdm_id,
-                     mojo::InterfaceRequest<mojo::Decryptor> decryptor) final;
+  void GetDecryptor(mojo::InterfaceRequest<mojo::Decryptor> decryptor) final;
+
+  // Get CdmContext to be used by the media pipeline.
+  CdmContext* GetCdmContext();
 
  private:
+  MojoCdmService(MojoCdmServiceContext* context,
+                 const mojo::String& key_system,
+                 mojo::InterfaceRequest<mojo::ContentDecryptionModule> request);
+
+  // mojo::ErrorHandler implementation.
+  void OnConnectionError() override;
+
   // Callbacks for firing session events.
   void OnSessionMessage(const std::string& session_id,
                         MediaKeys::MessageType message_type,
                         const std::vector<uint8_t>& message,
                         const GURL& legacy_destination_url);
   void OnSessionKeysChange(const std::string& session_id,
                            bool has_additional_usable_key,
                            CdmKeysInfo keys_info);
   void OnSessionExpirationUpdate(const std::string& session_id,
                                  const base::Time& new_expiry_time);
   void OnSessionClosed(const std::string& session_id);
   void OnLegacySessionError(const std::string& session_id,
                             MediaKeys::Exception exception,
                             uint32_t system_code,
                             const std::string& error_message);
 
-  mojo::StrongBinding<mojo::ContentDecryptionModule> binding_;
+  mojo::Binding<mojo::ContentDecryptionModule> binding_;
 
+  MojoCdmServiceContext* context_;
   scoped_ptr<MediaKeys> cdm_;
 
   mojo::ContentDecryptionModuleClientPtr client_;
 
   base::WeakPtr<MojoCdmService> weak_this_;
   base::WeakPtrFactory<MojoCdmService> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(MojoCdmService);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_MOJO_SERVICES_MOJO_CDM_SERVICE_H_