media/mojo/services/mojo_cdm.h

   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 MEDIA_MOJO_SERVICES_MOJO_CDM_H_
   6 #define MEDIA_MOJO_SERVICES_MOJO_CDM_H_
   7
   8 #include <vector>
   9
  10 #include "base/macros.h"
  11 #include "base/memory/weak_ptr.h"
  12 #include "media/base/cdm_context.h"
  13 #include "media/base/cdm_initialized_promise.h"
  14 #include "media/base/media_keys.h"
  15 #include "media/mojo/interfaces/content_decryption_module.mojom.h"
  16 #include "media/mojo/services/mojo_type_trait.h"
  17 #include "third_party/mojo/src/mojo/public/cpp/bindings/binding.h"
  18
  19 namespace mojo {
  20 class ServiceProvider;
  21 }
  22
  23 namespace media {
  24
  25 // A MediaKeys that proxies to a interfaces::ContentDecryptionModule. That
  26 // interfaces::ContentDecryptionModule proxies back to the MojoCdm via the
  27 // interfaces::ContentDecryptionModuleClient interface.
  28 class MojoCdm : public MediaKeys,
  29                 public CdmContext,
  30                 public interfaces::ContentDecryptionModuleClient {
  31  public:
  32   static void Create(
  33       const std::string& key_system,
  34       const GURL& security_origin,
  35       const media::CdmConfig& cdm_config,
  36       interfaces::ContentDecryptionModulePtr remote_cdm,
  37       const media::SessionMessageCB& session_message_cb,
  38       const media::SessionClosedCB& session_closed_cb,
  39       const media::LegacySessionErrorCB& legacy_session_error_cb,
  40       const media::SessionKeysChangeCB& session_keys_change_cb,
  41       const media::SessionExpirationUpdateCB& session_expiration_update_cb,
  42       const media::CdmCreatedCB& cdm_created_cb);
  43
  44   ~MojoCdm() final;
  45
  46   // MediaKeys implementation.
  47   void SetServerCertificate(const std::vector<uint8_t>& certificate,
  48                             scoped_ptr<SimpleCdmPromise> promise) final;
  49   void CreateSessionAndGenerateRequest(
  50       SessionType session_type,
  51       EmeInitDataType init_data_type,
  52       const std::vector<uint8_t>& init_data,
  53       scoped_ptr<NewSessionCdmPromise> promise) final;
  54   void LoadSession(SessionType session_type,
  55                    const std::string& session_id,
  56                    scoped_ptr<NewSessionCdmPromise> promise) final;
  57   void UpdateSession(const std::string& session_id,
  58                      const std::vector<uint8_t>& response,
  59                      scoped_ptr<SimpleCdmPromise> promise) final;
  60   void CloseSession(const std::string& session_id,
  61                     scoped_ptr<SimpleCdmPromise> promise) final;
  62   void RemoveSession(const std::string& session_id,
  63                      scoped_ptr<SimpleCdmPromise> promise) final;
  64   CdmContext* GetCdmContext() final;
  65
  66   // CdmContext implementation.
  67   media::Decryptor* GetDecryptor() final;
  68   int GetCdmId() const final;
  69
  70  private:
  71   MojoCdm(interfaces::ContentDecryptionModulePtr remote_cdm,
  72           const SessionMessageCB& session_message_cb,
  73           const SessionClosedCB& session_closed_cb,
  74           const LegacySessionErrorCB& legacy_session_error_cb,
  75           const SessionKeysChangeCB& session_keys_change_cb,
  76           const SessionExpirationUpdateCB& session_expiration_update_cb);
  77
  78   void InitializeCdm(const std::string& key_system,
  79                      const GURL& security_origin,
  80                      const media::CdmConfig& cdm_config,
  81                      scoped_ptr<CdmInitializedPromise> promise);
  82
  83   // interfaces::ContentDecryptionModuleClient implementation.
  84   void OnSessionMessage(const mojo::String& session_id,
  85                         interfaces::CdmMessageType message_type,
  86                         mojo::Array<uint8_t> message,
  87                         const mojo::String& legacy_destination_url) final;
  88   void OnSessionClosed(const mojo::String& session_id) final;
  89   void OnLegacySessionError(const mojo::String& session_id,
  90                             interfaces::CdmException exception,
  91                             uint32_t system_code,
  92                             const mojo::String& error_message) final;
  93   void OnSessionKeysChange(
  94       const mojo::String& session_id,
  95       bool has_additional_usable_key,
  96       mojo::Array<interfaces::CdmKeyInformationPtr> keys_info) final;
  97   void OnSessionExpirationUpdate(const mojo::String& session_id,
  98                                  double new_expiry_time_sec) final;
  99
 100   // Callbacks to handle CDM promises.
 101   // We have to inline this method, since MS VS 2013 compiler fails to compile
 102   // it when this method is not inlined. It fails with error C2244
 103   // "unable to match function definition to an existing declaration".
 104   template <typename... T>
 105   void OnPromiseResult(scoped_ptr<CdmPromiseTemplate<T...>> promise,
 106                        interfaces::CdmPromiseResultPtr result,
 107                        typename MojoTypeTrait<T>::MojoType... args) {
 108     if (result->success)
 109       promise->resolve(args.template To<T>()...);  // See ISO C++03 14.2/4.
 110     else
 111       RejectPromise(promise.Pass(), result.Pass());
 112   }
 113
 114   static int next_cdm_id_;
 115
 116   interfaces::ContentDecryptionModulePtr remote_cdm_;
 117   mojo::Binding<ContentDecryptionModuleClient> binding_;
 118   int cdm_id_;
 119
 120   // Callbacks for firing session events.
 121   SessionMessageCB session_message_cb_;
 122   SessionClosedCB session_closed_cb_;
 123   LegacySessionErrorCB legacy_session_error_cb_;
 124   SessionKeysChangeCB session_keys_change_cb_;
 125   SessionExpirationUpdateCB session_expiration_update_cb_;
 126
 127   base::WeakPtrFactory<MojoCdm> weak_factory_;
 128
 129   DISALLOW_COPY_AND_ASSIGN(MojoCdm);
 130 };
 131
 132 }  // namespace media
 133
 134 #endif  // MEDIA_MOJO_SERVICES_MOJO_CDM_H_