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1 // Copyright 2015 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 WebMediaSession_h | |
6 #define WebMediaSession_h | |
7 | |
8 #include "public/platform/WebCallbacks.h" | |
9 #include "public/platform/modules/mediasession/WebMediaSessionError.h" | |
10 | |
11 namespace blink { | |
12 | |
13 using WebMediaSessionActivateCallback = | |
14 WebCallbacks<void, const WebMediaSessionError&>; | |
15 using WebMediaSessionDeactivateCallback = WebCallbacks<void, void>; | |
16 | |
17 struct WebMediaMetadata; | |
18 | |
19 class WebMediaSession { | |
20 public: | |
21 enum { | |
22 // The media session for media elements that don't have an | |
23 // explicit user created media session set. | |
24 DefaultID = 0 | |
25 }; | |
26 | |
27 virtual ~WebMediaSession() = default; | |
28 | |
29 // Tries to activate the session by requesting audio focus from | |
30 // the system. May fail if audio focus is denied by the | |
31 // system. The ownership of the pointer is transferred to the | |
32 // WebMediaSession implementation. | |
33 virtual void activate(WebMediaSessionActivateCallback*) = 0; | |
34 | |
35 // Deactivates the session by abandoning audio focus. Will not | |
36 // fail in way visible to the user of the WebMediaSession. The | |
37 // ownership of the pointer is transferred to the WebMediaSession | |
38 // implementation. | |
39 virtual void deactivate(WebMediaSessionDeactivateCallback*) = 0; | |
40 | |
41 // Updates the metadata associated with the WebMediaSession. The metadata | |
42 // can be a nullptr in which case the assouciated metadata should be reset. | |
43 // The pointer is not owned by the WebMediaSession implementation. | |
44 virtual void setMetadata(const WebMediaMetadata*) = 0; | |
45 }; | |
46 | |
47 } // namespace blink | |
48 | |
49 #endif // WebMediaSession_h | |
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