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      1 // Copyright 2014 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 HTMLMediaElementEncryptedMedia_h
      6 #define HTMLMediaElementEncryptedMedia_h
      7 
      8 #include "modules/EventTargetModules.h"
      9 #include "platform/Supplementable.h"
     10 #include "platform/graphics/media/MediaPlayer.h"
     11 #include "platform/heap/Handle.h"
     12 #include "public/platform/WebMediaPlayerClient.h"
     13 #include "wtf/Forward.h"
     14 
     15 namespace WebCore {
     16 
     17 class ExceptionState;
     18 class HTMLMediaElement;
     19 class MediaKeys;
     20 
     21 class HTMLMediaElementEncryptedMedia FINAL : public NoBaseWillBeGarbageCollected<HTMLMediaElementEncryptedMedia>, public WillBeHeapSupplement<HTMLMediaElement> {
     22     WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(HTMLMediaElementEncryptedMedia);
     23     DECLARE_EMPTY_VIRTUAL_DESTRUCTOR_WILL_BE_REMOVED(HTMLMediaElementEncryptedMedia);
     24 public:
     25     // encrypted media extensions (v0.1b)
     26     static void webkitGenerateKeyRequest(HTMLMediaElement&, const String& keySystem, PassRefPtr<Uint8Array> initData, ExceptionState&);
     27     static void webkitGenerateKeyRequest(HTMLMediaElement&, const String& keySystem, ExceptionState&);
     28     static void webkitAddKey(HTMLMediaElement&, const String& keySystem, PassRefPtr<Uint8Array> key, PassRefPtr<Uint8Array> initData, const String& sessionId, ExceptionState&);
     29     static void webkitAddKey(HTMLMediaElement&, const String& keySystem, PassRefPtr<Uint8Array> key, ExceptionState&);
     30     static void webkitCancelKeyRequest(HTMLMediaElement&, const String& keySystem, const String& sessionId, ExceptionState&);
     31 
     32     DEFINE_STATIC_ATTRIBUTE_EVENT_LISTENER(webkitkeyadded);
     33     DEFINE_STATIC_ATTRIBUTE_EVENT_LISTENER(webkitkeyerror);
     34     DEFINE_STATIC_ATTRIBUTE_EVENT_LISTENER(webkitkeymessage);
     35     DEFINE_STATIC_ATTRIBUTE_EVENT_LISTENER(webkitneedkey);
     36 
     37     // encrypted media extensions (WD)
     38     static MediaKeys* mediaKeys(HTMLMediaElement&);
     39     static void setMediaKeys(HTMLMediaElement&, MediaKeys*, ExceptionState&);
     40     DEFINE_STATIC_ATTRIBUTE_EVENT_LISTENER(needkey);
     41 
     42     static void keyAdded(HTMLMediaElement&, const String& keySystem, const String& sessionId);
     43     static void keyError(HTMLMediaElement&, const String& keySystem, const String& sessionId, blink::WebMediaPlayerClient::MediaKeyErrorCode, unsigned short systemCode);
     44     static void keyMessage(HTMLMediaElement&, const String& keySystem, const String& sessionId, const unsigned char* message, unsigned messageLength, const blink::WebURL& defaultURL);
     45     static void keyNeeded(HTMLMediaElement&, const String& contentType, const unsigned char* initData, unsigned initDataLength);
     46     static void playerDestroyed(HTMLMediaElement&);
     47     static blink::WebContentDecryptionModule* contentDecryptionModule(HTMLMediaElement&);
     48 
     49     static HTMLMediaElementEncryptedMedia& from(HTMLMediaElement&);
     50     static const char* supplementName();
     51 
     52     virtual void trace(Visitor*) OVERRIDE;
     53 
     54 private:
     55     HTMLMediaElementEncryptedMedia();
     56     void generateKeyRequest(blink::WebMediaPlayer*, const String& keySystem, PassRefPtr<Uint8Array> initData, ExceptionState&);
     57     void addKey(blink::WebMediaPlayer*, const String& keySystem, PassRefPtr<Uint8Array> key, PassRefPtr<Uint8Array> initData, const String& sessionId, ExceptionState&);
     58     void cancelKeyRequest(blink::WebMediaPlayer*, const String& keySystem, const String& sessionId, ExceptionState&);
     59 
     60     // EventTarget
     61     bool setAttributeEventListener(const AtomicString& eventType, PassRefPtr<EventListener>);
     62     EventListener* getAttributeEventListener(const AtomicString& eventType);
     63 
     64     // Currently we have both EME v0.1b and EME WD implemented in media element.
     65     // But we do not want to support both at the same time. The one used first
     66     // will be supported. Use |m_emeMode| to track this selection.
     67     // FIXME: Remove EmeMode once EME v0.1b support is removed. See crbug.com/249976.
     68     enum EmeMode { EmeModeNotSelected, EmeModePrefixed, EmeModeUnprefixed };
     69 
     70     // check (and set if necessary) the encrypted media extensions (EME) mode
     71     // (v0.1b or WD). Returns whether the mode is allowed and successfully set.
     72     bool setEmeMode(EmeMode, ExceptionState&);
     73 
     74     blink::WebContentDecryptionModule* contentDecryptionModule();
     75     void setMediaKeysInternal(HTMLMediaElement&, MediaKeys*);
     76 
     77     EmeMode m_emeMode;
     78 
     79     PersistentWillBeMember<MediaKeys> m_mediaKeys;
     80 };
     81 
     82 }
     83 
     84 #endif
     85