Provide fine grained media playback time thru interpolation

content/renderer/media/android/webmediaplayer_android.h

 // Copyright 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 CONTENT_RENDERER_MEDIA_ANDROID_WEBMEDIAPLAYER_ANDROID_H_
 #define CONTENT_RENDERER_MEDIA_ANDROID_WEBMEDIAPLAYER_ANDROID_H_
 
 #include <jni.h>
 #include <string>
 #include <vector>
 
 #include "base/basictypes.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
 #include "base/threading/thread_checker.h"
+#include "base/time/default_tick_clock.h"
 #include "base/time/time.h"
 #include "cc/layers/video_frame_provider.h"
 #include "content/common/media/media_player_messages_enums_android.h"
 #include "content/public/renderer/render_frame_observer.h"
 #include "content/renderer/media/android/media_info_loader.h"
 #include "content/renderer/media/android/media_source_delegate.h"
 #include "content/renderer/media/android/stream_texture_factory.h"
 #include "content/renderer/media/crypto/proxy_decryptor.h"
 #include "gpu/command_buffer/common/mailbox.h"
 #include "media/base/android/media_player_android.h"
 #include "media/base/demuxer_stream.h"
 #include "media/base/media_keys.h"
+#include "media/base/time_delta_interpolator.h"
 #include "third_party/WebKit/public/platform/WebGraphicsContext3D.h"
 #include "third_party/WebKit/public/platform/WebMediaPlayer.h"
 #include "third_party/WebKit/public/platform/WebSize.h"
 #include "third_party/WebKit/public/platform/WebURL.h"
 #include "third_party/skia/include/core/SkBitmap.h"
 #include "third_party/skia/include/gpu/GrContext.h"
 #include "third_party/skia/include/gpu/SkGrPixelRef.h"
 #include "ui/gfx/rect_f.h"
 
 namespace base {
@@ skipping 139 matching lines @@
                               int height, bool success);
   void OnPlaybackComplete();
   void OnBufferingUpdate(int percentage);
   void OnSeekRequest(const base::TimeDelta& time_to_seek);
   void OnSeekComplete(const base::TimeDelta& current_time);
   void OnMediaError(int error_type);
   void OnVideoSizeChanged(int width, int height);
   void OnDurationChanged(const base::TimeDelta& duration);
 
   // Called to update the current time.
-  void OnTimeUpdate(const base::TimeDelta& current_time);
+  void OnTimeUpdate(base::TimeDelta current_timestamp,
+                    base::TimeTicks current_time_ticks);
 
   // Functions called when media player status changes.
   void OnConnectedToRemoteDevice(const std::string& remote_playback_message);
   void OnDisconnectedFromRemoteDevice();
   void OnDidEnterFullscreen();
   void OnDidExitFullscreen();
   void OnMediaPlayerPlay();
   void OnMediaPlayerPause();
   void OnRequestFullscreen();
 
@@ skipping 249 matching lines @@
 
   scoped_ptr<MediaSourceDelegate,
              MediaSourceDelegate::Destroyer> media_source_delegate_;
 
   // Internal pending playback state.
   // Store a playback request that cannot be started immediately.
   bool pending_playback_;
 
   MediaPlayerHostMsg_Initialize_Type player_type_;
 
-  // The current playing time. Because the media player is in the browser
-  // process, it will regularly update the |current_time_| by calling
-  // OnTimeUpdate().
-  double current_time_;
-
   // Whether the browser is currently connected to a remote media player.
   bool is_remote_;
 
   scoped_refptr<media::MediaLog> media_log_;
 
   scoped_ptr<MediaInfoLoader> info_loader_;
 
   // The currently selected key system. Empty string means that no key system
   // has been selected.
   std::string current_key_system_;
@@ skipping 16 matching lines @@
   media::DecryptorReadyCB decryptor_ready_cb_;
 
   SkBitmap bitmap_;
 
   // Whether stored credentials are allowed to be passed to the server.
   bool allow_stored_credentials_;
 
   // Whether the resource is local.
   bool is_local_resource_;
 
+  // base::TickClock used by |interpolator_|.
+  base::DefaultTickClock default_tick_clock_;
+
+  // Tracks the most recent media time update and provides interpolated values
+  // as playback progresses.
+  media::TimeDeltaInterpolator interpolator_;
+
   // NOTE: Weak pointers must be invalidated before all other member variables.
   base::WeakPtrFactory<WebMediaPlayerAndroid> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(WebMediaPlayerAndroid);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_MEDIA_ANDROID_WEBMEDIAPLAYER_ANDROID_H_