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| 1 // Copyright 2016 The Chromium Authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. |
| 4 |
| 5 #ifndef CHROMECAST_BROWSER_CAST_MEDIA_BLOCKER_H_ |
| 6 #define CHROMECAST_BROWSER_CAST_MEDIA_BLOCKER_H_ |
| 7 |
| 8 #include "base/macros.h" |
| 9 #include "content/public/browser/web_contents_observer.h" |
| 10 |
| 11 namespace content { |
| 12 class WebContents; |
| 13 } // namespace content |
| 14 |
| 15 namespace chromecast { |
| 16 namespace shell { |
| 17 |
| 18 // This class implements a blocking mode for web applications and is used in |
| 19 // Chromecast internal code. |
| 20 class CastMediaBlocker : public content::WebContentsObserver { |
| 21 public: |
| 22 explicit CastMediaBlocker(content::WebContents* web_contents); |
| 23 ~CastMediaBlocker() override; |
| 24 |
| 25 // Sets if the web contents is allowed to play media or not. If media is |
| 26 // unblocked, previously suspended elements should begin playing again. |
| 27 void BlockMediaLoading(bool blocked); |
| 28 |
| 29 protected: |
| 30 bool media_loading_blocked() const { return state_ == BLOCKED; } |
| 31 |
| 32 // Blocks or unblocks the render process from loading new media |
| 33 // according to |media_loading_blocked_|. |
| 34 virtual void UpdateMediaBlockedState(); |
| 35 |
| 36 private: |
| 37 enum BlockState { |
| 38 BLOCKED, // All media playback should be blocked. |
| 39 UNBLOCKING, // Media playback should be resumed at next oppurtunity. |
| 40 UNBLOCKED, // Media playback should not be blocked. |
| 41 }; |
| 42 |
| 43 // content::WebContentsObserver implementation: |
| 44 void MediaSessionStateChanged( |
| 45 bool is_controllable, |
| 46 bool is_suspended, |
| 47 const base::Optional<content::MediaMetadata>& metadata) override; |
| 48 |
| 49 // Whether or not media in the app can be controlled and if media is currently |
| 50 // suspended. These variables cache arguments from MediaSessionStateChanged(). |
| 51 bool controllable_; |
| 52 bool suspended_; |
| 53 |
| 54 BlockState state_; |
| 55 |
| 56 DISALLOW_COPY_AND_ASSIGN(CastMediaBlocker); |
| 57 }; |
| 58 |
| 59 } // namespace shell |
| 60 } // namespace chromecast |
| 61 |
| 62 #endif // CHROMECAST_BROWSER_CAST_MEDIA_BLOCKER_H_ |
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