content/renderer/media/webcontentdecryptionmodulesession_impl.h

   1 // Copyright 2013 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 CONTENT_RENDERER_MEDIA_WEBCONTENTDECRYPTIONMODULESESSION_IMPL_H_
   6 #define CONTENT_RENDERER_MEDIA_WEBCONTENTDECRYPTIONMODULESESSION_IMPL_H_
   7
   8 #include <map>
   9 #include <string>
  10 #include <vector>
  11
  12 #include "base/basictypes.h"
  13 #include "base/callback.h"
  14 #include "base/memory/ref_counted.h"
  15 #include "base/memory/weak_ptr.h"
  16 #include "media/base/media_keys.h"
  17 #include "third_party/WebKit/public/platform/WebContentDecryptionModuleSession.h"
  18 #include "third_party/WebKit/public/platform/WebString.h"
  19
  20 namespace media {
  21 class MediaKeys;
  22 }
  23
  24 namespace content {
  25 class CdmSessionAdapter;
  26
  27 class WebContentDecryptionModuleSessionImpl
  28     : public blink::WebContentDecryptionModuleSession {
  29  public:
  30   WebContentDecryptionModuleSessionImpl(
  31       const scoped_refptr<CdmSessionAdapter>& adapter);
  32   virtual ~WebContentDecryptionModuleSessionImpl();
  33
  34   // blink::WebContentDecryptionModuleSession implementation.
  35   virtual void setClientInterface(Client* client);
  36   virtual blink::WebString sessionId() const;
  37   // TODO(jrummell): Remove the next 3 methods once blink updated.
  38   virtual void initializeNewSession(const blink::WebString& mime_type,
  39                                     const uint8* init_data,
  40                                     size_t init_data_length);
  41   virtual void update(const uint8* response, size_t response_length);
  42   virtual void release();
  43   virtual void initializeNewSession(
  44       const blink::WebString& init_data_type,
  45       const uint8* init_data,
  46       size_t init_data_length,
  47       const blink::WebString& session_type,
  48       blink::WebContentDecryptionModuleResult result);
  49   virtual void update(const uint8* response,
  50                       size_t response_length,
  51                       blink::WebContentDecryptionModuleResult result);
  52   virtual void release(blink::WebContentDecryptionModuleResult result);
  53
  54   // Callbacks.
  55   void OnSessionMessage(const std::vector<uint8>& message,
  56                         const GURL& destination_url);
  57   void OnSessionReady();
  58   void OnSessionClosed();
  59   void OnSessionError(media::MediaKeys::Exception exception_code,
  60                       uint32 system_code,
  61                       const std::string& error_message);
  62
  63  private:
  64   typedef std::map<uint32, blink::WebContentDecryptionModuleResult> ResultMap;
  65
  66   // These function are used as callbacks when CdmPromise resolves/rejects.
  67   // |result_index| = kReservedIndex means that there is no
  68   // WebContentDecryptionModuleResult.
  69   void SessionCreated(uint32 result_index, const std::string& web_session_id);
  70   void SessionUpdatedOrReleased(uint32 result_index);
  71   void SessionError(uint32 result_index,
  72                     media::MediaKeys::Exception exception_code,
  73                     uint32 system_code,
  74                     const std::string& error_message);
  75
  76   // As initializeNewSession(), update(), and release() get passed a
  77   // WebContentDecryptionModuleResult, keep track of them since this class owns
  78   // it and needs to keep them around until completed. Returns the index used
  79   // to locate the WebContentDecryptionModuleResult when the operation is
  80   // complete.
  81   uint32 AddResult(blink::WebContentDecryptionModuleResult result);
  82
  83   scoped_refptr<CdmSessionAdapter> adapter_;
  84
  85   // Non-owned pointer.
  86   Client* client_;
  87
  88   // Web session ID is the app visible ID for this session generated by the CDM.
  89   // This value is not set until the CDM resolves the initializeNewSession()
  90   // promise.
  91   std::string web_session_id_;
  92
  93   // Don't pass more than 1 close() event to blink::
  94   // TODO(jrummell): Remove this once blink tests handle close() promise and
  95   // closed() event.
  96   bool is_closed_;
  97
  98   // Keep track of all the outstanding WebContentDecryptionModuleResult objects.
  99   uint32 next_available_result_index_;
 100   ResultMap outstanding_results_;
 101
 102   // Since promises will live until they are fired, use a weak reference when
 103   // creating a promise in case this class disappears before the promise
 104   // actually fires.
 105   base::WeakPtrFactory<WebContentDecryptionModuleSessionImpl> weak_ptr_factory_;
 106
 107   DISALLOW_COPY_AND_ASSIGN(WebContentDecryptionModuleSessionImpl);
 108 };
 109
 110 }  // namespace content
 111
 112 #endif  // CONTENT_RENDERER_MEDIA_WEBCONTENTDECRYPTIONMODULESESSION_IMPL_H_