Add Promises for EME (Chromium side)

media/base/android/media_drm_bridge.h

 // Copyright (c) 2013 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_BASE_ANDROID_MEDIA_DRM_BRIDGE_H_
 #define MEDIA_BASE_ANDROID_MEDIA_DRM_BRIDGE_H_
 
 #include <jni.h>
 #include <string>
 #include <vector>
 
 #include "base/android/scoped_java_ref.h"
 #include "base/callback.h"
 #include "base/memory/scoped_ptr.h"
 #include "media/base/media_export.h"
 #include "media/base/media_keys.h"
 #include "url/gurl.h"
 
 class GURL;
 
 namespace media {
 
 class MediaPlayerManager;
 
 // This class provides DRM services for android EME implementation.
 // TODO(qinmin): implement all the functions in this class.
-class MEDIA_EXPORT MediaDrmBridge : public MediaKeys {
+class MEDIA_EXPORT MediaDrmBridge {
  public:
   enum SecurityLevel {
     SECURITY_LEVEL_NONE = 0,
     SECURITY_LEVEL_1 = 1,
     SECURITY_LEVEL_3 = 3,
   };
 
   typedef base::Callback<void(bool)> ResetCredentialsCB;
 
+  typedef base::Callback<
+      void(uint32 session_id, const std::string& web_session_id)>
+      SessionCreatedCB;
+
+  typedef base::Callback<void(uint32 session_id,
+                              const std::vector<uint8>& message,
+                              const GURL& destination_url)> SessionMessageCB;
+
+  typedef base::Callback<void(uint32 session_id)> SessionReadyCB;
+
+  typedef base::Callback<void(uint32 session_id)> SessionClosedCB;
+
+  typedef base::Callback<void(uint32 session_id,
+                              media::MediaKeys::KeyError error_code,
+                              uint32 system_code)> SessionErrorCB;
+
   virtual ~MediaDrmBridge();
 
   // Checks whether MediaDRM is available.
   // All other static methods check IsAvailable() internally. There's no need
   // to check IsAvailable() explicitly before calling them.
   static bool IsAvailable();
 
   static bool IsSecurityLevelSupported(const std::string& key_system,
                                        SecurityLevel security_level);
 
@@ skipping 34 matching lines @@
 
   // Returns true if |security_level| is successfully set, or false otherwise.
   // Call this function right after Create() and before any other calls.
   // Note:
   // - If this function is not called, the default security level of the device
   //   will be used.
   // - It's recommended to call this function only once on a MediaDrmBridge
   //   object. Calling this function multiples times may cause errors.
   bool SetSecurityLevel(SecurityLevel security_level);
 
-  // MediaKeys implementations.
-  virtual bool CreateSession(uint32 session_id,
-                             const std::string& content_type,
-                             const uint8* init_data,
-                             int init_data_length) OVERRIDE;
-  virtual void LoadSession(uint32 session_id,
-                           const std::string& web_session_id) OVERRIDE;
-  virtual void UpdateSession(uint32 session_id,
-                             const uint8* response,
-                             int response_length) OVERRIDE;
-  virtual void ReleaseSession(uint32 session_id) OVERRIDE;
+  // Media key operations.
+  bool CreateSession(uint32 session_id,
+                     const std::string& content_type,
+                     const uint8* init_data,
+                     int init_data_length);
+  void LoadSession(uint32 session_id, const std::string& web_session_id);
+  void UpdateSession(uint32 session_id,
+                     const uint8* response,
+                     int response_length);
+  void ReleaseSession(uint32 session_id);
 
   // Returns a MediaCrypto object if it's already created. Returns a null object
   // otherwise.
   base::android::ScopedJavaLocalRef<jobject> GetMediaCrypto();
 
   // Sets callback which will be called when MediaCrypto is ready.
   // If |closure| is null, previously set callback will be cleared.
   void SetMediaCryptoReadyCB(const base::Closure& closure);
 
   // Called after a MediaCrypto object is created.
@@ skipping 50 matching lines @@
   base::Closure media_crypto_ready_cb_;
 
   ResetCredentialsCB reset_credentials_cb_;
 
   DISALLOW_COPY_AND_ASSIGN(MediaDrmBridge);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_BASE_ANDROID_MEDIA_DRM_BRIDGE_H_