Implement MediaSession on top of the WebMediaPlayerDelegate.

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 <stdint.h>
 
 #include <string>
 #include <vector>
 
 #include "base/macros.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/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/renderer_media_player_manager.h"
 #include "content/renderer/media/android/stream_texture_factory.h"
 #include "gpu/command_buffer/common/mailbox.h"
 #include "media/base/android/media_player_android.h"
 #include "media/base/cdm_context.h"
 #include "media/base/demuxer_stream.h"
 #include "media/base/media_keys.h"
 #include "media/base/time_delta_interpolator.h"
+#include "media/blink/webmediaplayer_delegate.h"
 #include "media/blink/webmediaplayer_params.h"
 #include "media/cdm/proxy_decryptor.h"
 #include "third_party/WebKit/public/platform/WebGraphicsContext3D.h"
 #include "third_party/WebKit/public/platform/WebMediaPlayer.h"
 #include "third_party/WebKit/public/platform/WebSetSinkIdCallbacks.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 "ui/gfx/geometry/rect_f.h"
 
@@ skipping 17 matching lines @@
 namespace gpu {
 struct MailboxHolder;
 }
 
 namespace media {
 class CdmContext;
 class CdmFactory;
 class MediaLog;
 class MediaPermission;
 class WebContentDecryptionModuleImpl;
-class WebMediaPlayerDelegate;
 }
 
 namespace content {
 
 class RendererCdmManager;
 class RendererMediaPlayerManager;
 
 // This class implements blink::WebMediaPlayer by keeping the android
 // media player in the browser process. It listens to all the status changes
 // sent from the browser process and sends playback controls to the media
 // player.
-class WebMediaPlayerAndroid : public blink::WebMediaPlayer,
-                              public cc::VideoFrameProvider,
-                              public RenderFrameObserver,
-                              public StreamTextureFactoryContextObserver,
-                              public media::RendererMediaPlayerInterface {
+class WebMediaPlayerAndroid
+    : public blink::WebMediaPlayer,
+      public cc::VideoFrameProvider,
+      public StreamTextureFactoryContextObserver,
+      public media::RendererMediaPlayerInterface,
+      public NON_EXPORTED_BASE(media::WebMediaPlayerDelegate::Observer) {
  public:
   // Construct a WebMediaPlayerAndroid object. This class communicates with the
   // MediaPlayerAndroid object in the browser process through |proxy|.
   // TODO(qinmin): |frame| argument is used to determine whether the current
   // player can enter fullscreen. This logic should probably be moved into
   // blink, so that enterFullscreen() will not be called if another video is
   // already in fullscreen.
   WebMediaPlayerAndroid(
       blink::WebFrame* frame,
       blink::WebMediaPlayerClient* client,
@@ skipping 123 matching lines @@
   void ResetStreamTextureProxy() override;
 
   // Called when the player is released.
   void OnPlayerReleased() override;
 
   // This function is called by the RendererMediaPlayerManager to pause the
   // video and release the media player and surface texture when we switch tabs.
   // However, the actual GlTexture is not released to keep the video screenshot.
   void SuspendAndReleaseResources() override;
 
-  // RenderFrameObserver implementation.
-  void OnDestruct() override;
-
 #if defined(VIDEO_HOLE)
   // Calculate the boundary rectangle of the media player (i.e. location and
   // size of the video frame).
   // Returns true if the geometry has been changed since the last call.
   bool UpdateBoundaryRectangle() override;
 
   const gfx::RectF GetBoundaryRectangle() override;
 #endif  // defined(VIDEO_HOLE)
 
   MediaKeyException generateKeyRequest(const blink::WebString& key_system,
@@ skipping 23 matching lines @@
 
   void OnMediaSourceOpened(blink::WebMediaSource* web_media_source);
 
   void OnEncryptedMediaInitData(media::EmeInitDataType init_data_type,
                                 const std::vector<uint8_t>& init_data);
 
   // Called when a decoder detects that the key needed to decrypt the stream
   // is not available.
   void OnWaitingForDecryptionKey() override;
 
+  // WebMediaPlayerDelegate::Observer implementation.
+  void OnHidden() override;
+  void OnShown() override;
+  void OnPlay() override;
+  void OnPause() override;
+  void OnVolumeMultiplierUpdate(double multiplier) override;
+
  protected:
   // Helper method to update the playing state.
   void UpdatePlayingState(bool is_playing_);
 
   // Helper methods for posting task for setting states and update WebKit.
   void UpdateNetworkState(blink::WebMediaPlayer::NetworkState state);
   void UpdateReadyState(blink::WebMediaPlayer::ReadyState state);
   void TryCreateStreamTextureProxyIfNeeded();
   void DoCreateStreamTexture();
 
@@ skipping 65 matching lines @@
 
   // Called after |defer_load_cb_| has decided to allow the load. If
   // |defer_load_cb_| is null this is called immediately.
   void DoLoad(LoadType load_type, const blink::WebURL& url, CORSMode cors_mode);
 
   blink::WebFrame* const frame_;
 
   blink::WebMediaPlayerClient* const client_;
   blink::WebMediaPlayerEncryptedMediaClient* const encrypted_client_;
 
-  // |delegate_| is used to notify the browser process of the player status, so
-  // that the browser process can control screen locks.
-  // TODO(qinmin): Currently android mediaplayer takes care of the screen
-  // lock. So this is only used for media source. Will apply this to regular
-  // media tag once http://crbug.com/247892 is fixed.
+  // WebMediaPlayer notifies the |delegate_| of playback state changes using
+  // |delegate_id_|; an id provided after registering with the delegate.  The
+  // WebMediaPlayer may also receive directives (play, pause) from the delegate
+  // via the WebMediaPlayerDelegate::Observer interface after registration.
   base::WeakPtr<media::WebMediaPlayerDelegate> delegate_;
+  int delegate_id_;
 
   // Callback responsible for determining if loading of media should be deferred
   // for external reasons; called during load().
   media::WebMediaPlayerParams::DeferLoadCB defer_load_cb_;
 
   // Save the list of buffered time ranges.
   blink::WebTimeRanges buffered_;
 
   // Size of the video.
   blink::WebSize natural_size_;
@@ skipping 161 matching lines @@
 
   int frame_id_;
 
   // Whether to require that surface textures are copied in order to support
   // sharing between render and gpu threads in WebView.
   bool enable_texture_copy_;
 
   // Whether to delete the existing texture and re-create it.
   bool suppress_deleting_texture_;
 
+  // Whether OnPlaybackComplete() has been called since the last playback.
+  bool playback_completed_;
+
+  // The last volume received by setVolume() and the last volume multiplier from
+  // OnVolumeMultiplierUpdate().  The multiplier is typical 1.0, but may be less
+  // if the WebMediaPlayerDelegate has requested a volume reduction (ducking)
+  // for a transient sound.  Playout volume is derived by volume * multiplier.
+  double volume_;
+  double volume_multiplier_;
+
   // 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_